Re: [PATCH v6 1/2] usb: typec: USB Type-C Port Manager (tcpm)

[Guenter Roeck]

On Wed, Apr 26, 2017 at 03:26:11PM -0700, Guenter Roeck wrote:
> From: Guenter Roeck <groeck@xxxxxxxxxxxx>
> 
> This driver implements the USB Type-C Power Delivery state machine
> for both source and sink ports. Alternate mode support is not
> fully implemented.
> 
> The driver attaches to the USB Type-C class code implemented in
> the following patches.
> 
> 	usb: typec: add driver for Intel Whiskey Cove PMIC USB Type-C PHY
> 	usb: USB Type-C connector class
> 
> This driver only implements the state machine. Lower level drivers are
> responsible for
> - Reporting VBUS status and activating VBUS
> - Setting CC lines and providing CC line status
> - Setting line polarity
> - Activating and deactivating VCONN
> - Setting the current limit
> - Activating and deactivating PD message transfers
> - Sending and receiving PD messages
> 
> The driver provides both a functional API as well as callbacks for
> lower level drivers.
> 
> Signed-off-by: Guenter Roeck <groeck@xxxxxxxxxxxx>
> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>

Of course this has missing dependencies and won't compile if CONFIG_DEBUG_FS
is not enabled. Greg, should I send v7 or follow-up patches ?

Thanks,
Guenter

> ---
> v6:
> - Move driver and include files to -staging
> - Remove unused defines from include files
> - Fix compile error seen when building on top of -next (include file change)
> - Fix VDO log message
> - Various endianness fixes
> - Separate PDO logging into separate function
> - Replace "SBZ" in include files with "Reserved; Shall be set to zero"
> - Fix VDO_AMA macro
> - Move pd_mode_data from pd_vdo.h to tcpm.c
> - Add TODO file
> 
> v5:
> - Adjust to infrastructure API changes
> - Minor API change to low level driver
>   [set_pd_header -> set_roles]
> - Set default state depending on preferred role
> - Improve Try.SRC and Try.SNK implementation
> - Do not report stale identity information to infrastructure 
> - Fix crash seen if a SVD message was received while disconnected
> - Improve accessory handling
> - If a role change is requested and the partner does not support PD,
>   request a port reset
> - Set state to SRC_READY after PD_N_CAPS_COUNT if the partner does not
>   respond to capabilities messages
> - Update PD_T_SEND_SOURCE_CAP to improve compatibility with slow partners
> - Coding style fixes
> 
> v4:
> - Source and sink capabilities can now change on the fly
> - Introduced several new macros to identify CC states
> - Determine RP value to set based on maximum current supported
>   by a port configured as source
> - Support for DRP toggling implemented in hardware (by Type-C port controller)
> - Added MODULE_ macros
> 
> v3:
> - Improve TCPM state machine resiliency if there are spurious CC line changes
>   while the state machine is in a transient change (waiting for a timeout)
> - Update current limit after CC voltage level changes on a port which is not
>   PD capable.
> 
> v2:
> - Only update polarity if setting it was successful
>   If setting the CC line polarity in the driver was not successful,
>   don't update the internal polarity state.
> - All PD messages are little endian; convert to and from CPU endianness.
> - Avoid comparisons against NULL.
> - Use u8/u16/u32 instead of uint8_t/uint16_t/uint32_t consistently.
> - Callbacks into tcpm need to be lockless to avoid timing problems
>   in low level drivers.
> - Simplify callbacks; tcpm can request the current state of cc/vbus
>   when it is ready to use it.
> 
>  drivers/staging/Kconfig        |    2 +
>  drivers/staging/Makefile       |    2 +-
>  drivers/staging/typec/Kconfig  |   10 +
>  drivers/staging/typec/Makefile |    1 +
>  drivers/staging/typec/TODO     |   12 +
>  drivers/staging/typec/pd.h     |  281 ++++
>  drivers/staging/typec/pd_bdo.h |   31 +
>  drivers/staging/typec/pd_vdo.h |  249 +++
>  drivers/staging/typec/tcpm.c   | 3464 ++++++++++++++++++++++++++++++++++++++++
>  drivers/staging/typec/tcpm.h   |  150 ++
>  10 files changed, 4201 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/staging/typec/Kconfig
>  create mode 100644 drivers/staging/typec/Makefile
>  create mode 100644 drivers/staging/typec/TODO
>  create mode 100644 drivers/staging/typec/pd.h
>  create mode 100644 drivers/staging/typec/pd_bdo.h
>  create mode 100644 drivers/staging/typec/pd_vdo.h
>  create mode 100644 drivers/staging/typec/tcpm.c
>  create mode 100644 drivers/staging/typec/tcpm.h
> 
> diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
> index 65440f675033..af81544091e3 100644
> --- a/drivers/staging/Kconfig
> +++ b/drivers/staging/Kconfig
> @@ -104,4 +104,6 @@ source "drivers/staging/greybus/Kconfig"
>  
>  source "drivers/staging/vc04_services/Kconfig"
>  
> +source "drivers/staging/typec/Kconfig"
> +
>  endif # STAGING
> diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
> index 13ae7f899b21..077285c648e6 100644
> --- a/drivers/staging/Makefile
> +++ b/drivers/staging/Makefile
> @@ -41,4 +41,4 @@ obj-$(CONFIG_MOST)		+= most/
>  obj-$(CONFIG_KS7010)		+= ks7010/
>  obj-$(CONFIG_GREYBUS)		+= greybus/
>  obj-$(CONFIG_BCM2835_VCHIQ)	+= vc04_services/
> -
> +obj-y				+= typec/
> diff --git a/drivers/staging/typec/Kconfig b/drivers/staging/typec/Kconfig
> new file mode 100644
> index 000000000000..1aa0ffb856a4
> --- /dev/null
> +++ b/drivers/staging/typec/Kconfig
> @@ -0,0 +1,10 @@
> +menu "USB Power Delivery and Type-C drivers"
> +
> +config TYPEC_TCPM
> +	tristate "USB Type-C Port Controller Manager"
> +	select TYPEC
> +	help
> +	  The Type-C Port Controller Manager provides a USB PD and USB Type-C
> +	  state machine for use with Type-C Port Controllers.
> +
> +endmenu
> diff --git a/drivers/staging/typec/Makefile b/drivers/staging/typec/Makefile
> new file mode 100644
> index 000000000000..4d82c2480fc2
> --- /dev/null
> +++ b/drivers/staging/typec/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_TYPEC_TCPM)	+= tcpm.o
> diff --git a/drivers/staging/typec/TODO b/drivers/staging/typec/TODO
> new file mode 100644
> index 000000000000..a8db476704f0
> --- /dev/null
> +++ b/drivers/staging/typec/TODO
> @@ -0,0 +1,12 @@
> +tcpm:
> +- Add documentation (at the very least for the API to low level drivers)
> +- Split PD code into separate file
> +- Check if it makes sense to use tracepoints instead of debugfs for debug logs
> +- Implement Alternate Mode handling
> +- Address "#if 0" code if not addressed with the above
> +- Validate all comments marked with "XXX"; either address or remove comments
> +- Add support for USB PD 3.0. While not mandatory, at least fast role swap
> +  as well as authentication support would be very desirable.
> +
> +Please send patches to Guenter Roeck <linux@xxxxxxxxxxxx> and copy
> +Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>.
> diff --git a/drivers/staging/typec/pd.h b/drivers/staging/typec/pd.h
> new file mode 100644
> index 000000000000..8d97bdb95f23
> --- /dev/null
> +++ b/drivers/staging/typec/pd.h
> @@ -0,0 +1,281 @@
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __LINUX_USB_PD_H
> +#define __LINUX_USB_PD_H
> +
> +#include <linux/types.h>
> +#include <linux/usb/typec.h>
> +
> +/* USB PD Messages */
> +enum pd_ctrl_msg_type {
> +	/* 0 Reserved */
> +	PD_CTRL_GOOD_CRC = 1,
> +	PD_CTRL_GOTO_MIN = 2,
> +	PD_CTRL_ACCEPT = 3,
> +	PD_CTRL_REJECT = 4,
> +	PD_CTRL_PING = 5,
> +	PD_CTRL_PS_RDY = 6,
> +	PD_CTRL_GET_SOURCE_CAP = 7,
> +	PD_CTRL_GET_SINK_CAP = 8,
> +	PD_CTRL_DR_SWAP = 9,
> +	PD_CTRL_PR_SWAP = 10,
> +	PD_CTRL_VCONN_SWAP = 11,
> +	PD_CTRL_WAIT = 12,
> +	PD_CTRL_SOFT_RESET = 13,
> +	/* 14-15 Reserved */
> +};
> +
> +enum pd_data_msg_type {
> +	/* 0 Reserved */
> +	PD_DATA_SOURCE_CAP = 1,
> +	PD_DATA_REQUEST = 2,
> +	PD_DATA_BIST = 3,
> +	PD_DATA_SINK_CAP = 4,
> +	/* 5-14 Reserved */
> +	PD_DATA_VENDOR_DEF = 15,
> +};
> +
> +#define PD_REV10	0x0
> +#define PD_REV20	0x1
> +
> +#define PD_HEADER_CNT_SHIFT	12
> +#define PD_HEADER_CNT_MASK	0x7
> +#define PD_HEADER_ID_SHIFT	9
> +#define PD_HEADER_ID_MASK	0x7
> +#define PD_HEADER_PWR_ROLE	BIT(8)
> +#define PD_HEADER_REV_SHIFT	6
> +#define PD_HEADER_REV_MASK	0x3
> +#define PD_HEADER_DATA_ROLE	BIT(5)
> +#define PD_HEADER_TYPE_SHIFT	0
> +#define PD_HEADER_TYPE_MASK	0xf
> +
> +#define PD_HEADER(type, pwr, data, id, cnt)				\
> +	((((type) & PD_HEADER_TYPE_MASK) << PD_HEADER_TYPE_SHIFT) |	\
> +	 ((pwr) == TYPEC_SOURCE ? PD_HEADER_PWR_ROLE : 0) |		\
> +	 ((data) == TYPEC_HOST ? PD_HEADER_DATA_ROLE : 0) |		\
> +	 (PD_REV20 << PD_HEADER_REV_SHIFT) |				\
> +	 (((id) & PD_HEADER_ID_MASK) << PD_HEADER_ID_SHIFT) |		\
> +	 (((cnt) & PD_HEADER_CNT_MASK) << PD_HEADER_CNT_SHIFT))
> +
> +#define PD_HEADER_LE(type, pwr, data, id, cnt) \
> +	cpu_to_le16(PD_HEADER((type), (pwr), (data), (id), (cnt)))
> +
> +static inline unsigned int pd_header_cnt(u16 header)
> +{
> +	return (header >> PD_HEADER_CNT_SHIFT) & PD_HEADER_CNT_MASK;
> +}
> +
> +static inline unsigned int pd_header_cnt_le(__le16 header)
> +{
> +	return pd_header_cnt(le16_to_cpu(header));
> +}
> +
> +static inline unsigned int pd_header_type(u16 header)
> +{
> +	return (header >> PD_HEADER_TYPE_SHIFT) & PD_HEADER_TYPE_MASK;
> +}
> +
> +static inline unsigned int pd_header_type_le(__le16 header)
> +{
> +	return pd_header_type(le16_to_cpu(header));
> +}
> +
> +#define PD_MAX_PAYLOAD		7
> +
> +struct pd_message {
> +	__le16 header;
> +	__le32 payload[PD_MAX_PAYLOAD];
> +} __packed;
> +
> +/* PDO: Power Data Object */
> +#define PDO_MAX_OBJECTS		7
> +
> +enum pd_pdo_type {
> +	PDO_TYPE_FIXED = 0,
> +	PDO_TYPE_BATT = 1,
> +	PDO_TYPE_VAR = 2,
> +};
> +
> +#define PDO_TYPE_SHIFT		30
> +#define PDO_TYPE_MASK		0x3
> +
> +#define PDO_TYPE(t)	((t) << PDO_TYPE_SHIFT)
> +
> +#define PDO_VOLT_MASK		0x3ff
> +#define PDO_CURR_MASK		0x3ff
> +#define PDO_PWR_MASK		0x3ff
> +
> +#define PDO_FIXED_DUAL_ROLE	BIT(29)	/* Power role swap supported */
> +#define PDO_FIXED_SUSPEND	BIT(28) /* USB Suspend supported (Source) */
> +#define PDO_FIXED_HIGHER_CAP	BIT(28) /* Requires more than vSafe5V (Sink) */
> +#define PDO_FIXED_EXTPOWER	BIT(27) /* Externally powered */
> +#define PDO_FIXED_USB_COMM	BIT(26) /* USB communications capable */
> +#define PDO_FIXED_DATA_SWAP	BIT(25) /* Data role swap supported */
> +#define PDO_FIXED_VOLT_SHIFT	10	/* 50mV units */
> +#define PDO_FIXED_CURR_SHIFT	0	/* 10mA units */
> +
> +#define PDO_FIXED_VOLT(mv)	((((mv) / 50) & PDO_VOLT_MASK) << PDO_FIXED_VOLT_SHIFT)
> +#define PDO_FIXED_CURR(ma)	((((ma) / 10) & PDO_CURR_MASK) << PDO_FIXED_CURR_SHIFT)
> +
> +#define PDO_FIXED(mv, ma, flags)			\
> +	(PDO_TYPE(PDO_TYPE_FIXED) | (flags) |		\
> +	 PDO_FIXED_VOLT(mv) | PDO_FIXED_CURR(ma))
> +
> +#define PDO_BATT_MAX_VOLT_SHIFT	20	/* 50mV units */
> +#define PDO_BATT_MIN_VOLT_SHIFT	10	/* 50mV units */
> +#define PDO_BATT_MAX_PWR_SHIFT	0	/* 250mW units */
> +
> +#define PDO_BATT_MIN_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_BATT_MIN_VOLT_SHIFT)
> +#define PDO_BATT_MAX_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_BATT_MAX_VOLT_SHIFT)
> +#define PDO_BATT_MAX_POWER(mw) ((((mw) / 250) & PDO_PWR_MASK) << PDO_BATT_MAX_PWR_SHIFT)
> +
> +#define PDO_BATT(min_mv, max_mv, max_mw)			\
> +	(PDO_TYPE(PDO_TYPE_BATT) | PDO_BATT_MIN_VOLT(min_mv) |	\
> +	 PDO_BATT_MAX_VOLT(max_mv) | PDO_BATT_MAX_POWER(max_mw))
> +
> +#define PDO_VAR_MAX_VOLT_SHIFT	20	/* 50mV units */
> +#define PDO_VAR_MIN_VOLT_SHIFT	10	/* 50mV units */
> +#define PDO_VAR_MAX_CURR_SHIFT	0	/* 10mA units */
> +
> +#define PDO_VAR_MIN_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_VAR_MIN_VOLT_SHIFT)
> +#define PDO_VAR_MAX_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_VAR_MAX_VOLT_SHIFT)
> +#define PDO_VAR_MAX_CURR(ma) ((((ma) / 10) & PDO_CURR_MASK) << PDO_VAR_MAX_CURR_SHIFT)
> +
> +#define PDO_VAR(min_mv, max_mv, max_ma)				\
> +	(PDO_TYPE(PDO_TYPE_VAR) | PDO_VAR_MIN_VOLT(min_mv) |	\
> +	 PDO_VAR_MAX_VOLT(max_mv) | PDO_VAR_MAX_CURR(max_ma))
> +
> +static inline enum pd_pdo_type pdo_type(u32 pdo)
> +{
> +	return (pdo >> PDO_TYPE_SHIFT) & PDO_TYPE_MASK;
> +}
> +
> +static inline unsigned int pdo_fixed_voltage(u32 pdo)
> +{
> +	return ((pdo >> PDO_FIXED_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;
> +}
> +
> +static inline unsigned int pdo_min_voltage(u32 pdo)
> +{
> +	return ((pdo >> PDO_VAR_MIN_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;
> +}
> +
> +static inline unsigned int pdo_max_voltage(u32 pdo)
> +{
> +	return ((pdo >> PDO_VAR_MAX_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;
> +}
> +
> +static inline unsigned int pdo_max_current(u32 pdo)
> +{
> +	return ((pdo >> PDO_VAR_MAX_CURR_SHIFT) & PDO_CURR_MASK) * 10;
> +}
> +
> +static inline unsigned int pdo_max_power(u32 pdo)
> +{
> +	return ((pdo >> PDO_BATT_MAX_PWR_SHIFT) & PDO_PWR_MASK) * 250;
> +}
> +
> +/* RDO: Request Data Object */
> +#define RDO_OBJ_POS_SHIFT	28
> +#define RDO_OBJ_POS_MASK	0x7
> +#define RDO_GIVE_BACK		BIT(27)	/* Supports reduced operating current */
> +#define RDO_CAP_MISMATCH	BIT(26) /* Not satisfied by source caps */
> +#define RDO_USB_COMM		BIT(25) /* USB communications capable */
> +#define RDO_NO_SUSPEND		BIT(24) /* USB Suspend not supported */
> +
> +#define RDO_PWR_MASK			0x3ff
> +#define RDO_CURR_MASK			0x3ff
> +
> +#define RDO_FIXED_OP_CURR_SHIFT		10
> +#define RDO_FIXED_MAX_CURR_SHIFT	0
> +
> +#define RDO_OBJ(idx) (((idx) & RDO_OBJ_POS_MASK) << RDO_OBJ_POS_SHIFT)
> +
> +#define PDO_FIXED_OP_CURR(ma) ((((ma) / 10) & RDO_CURR_MASK) << RDO_FIXED_OP_CURR_SHIFT)
> +#define PDO_FIXED_MAX_CURR(ma) ((((ma) / 10) & RDO_CURR_MASK) << RDO_FIXED_MAX_CURR_SHIFT)
> +
> +#define RDO_FIXED(idx, op_ma, max_ma, flags)			\
> +	(RDO_OBJ(idx) | (flags) |				\
> +	 PDO_FIXED_OP_CURR(op_ma) | PDO_FIXED_MAX_CURR(max_ma))
> +
> +#define RDO_BATT_OP_PWR_SHIFT		10	/* 250mW units */
> +#define RDO_BATT_MAX_PWR_SHIFT		0	/* 250mW units */
> +
> +#define RDO_BATT_OP_PWR(mw) ((((mw) / 250) & RDO_PWR_MASK) << RDO_BATT_OP_PWR_SHIFT)
> +#define RDO_BATT_MAX_PWR(mw) ((((mw) / 250) & RDO_PWR_MASK) << RDO_BATT_MAX_PWR_SHIFT)
> +
> +#define RDO_BATT(idx, op_mw, max_mw, flags)			\
> +	(RDO_OBJ(idx) | (flags) |				\
> +	 RDO_BATT_OP_PWR(op_mw) | RDO_BATT_MAX_PWR(max_mw))
> +
> +static inline unsigned int rdo_index(u32 rdo)
> +{
> +	return (rdo >> RDO_OBJ_POS_SHIFT) & RDO_OBJ_POS_MASK;
> +}
> +
> +static inline unsigned int rdo_op_current(u32 rdo)
> +{
> +	return ((rdo >> RDO_FIXED_OP_CURR_SHIFT) & RDO_CURR_MASK) * 10;
> +}
> +
> +static inline unsigned int rdo_max_current(u32 rdo)
> +{
> +	return ((rdo >> RDO_FIXED_MAX_CURR_SHIFT) &
> +		RDO_CURR_MASK) * 10;
> +}
> +
> +static inline unsigned int rdo_op_power(u32 rdo)
> +{
> +	return ((rdo >> RDO_BATT_OP_PWR_SHIFT) & RDO_PWR_MASK) * 250;
> +}
> +
> +static inline unsigned int rdo_max_power(u32 rdo)
> +{
> +	return ((rdo >> RDO_BATT_MAX_PWR_SHIFT) & RDO_PWR_MASK) * 250;
> +}
> +
> +/* USB PD timers and counters */
> +#define PD_T_NO_RESPONSE	5000	/* 4.5 - 5.5 seconds */
> +#define PD_T_DB_DETECT		10000	/* 10 - 15 seconds */
> +#define PD_T_SEND_SOURCE_CAP	150	/* 100 - 200 ms */
> +#define PD_T_SENDER_RESPONSE	60	/* 24 - 30 ms, relaxed */
> +#define PD_T_SOURCE_ACTIVITY	45
> +#define PD_T_SINK_ACTIVITY	135
> +#define PD_T_SINK_WAIT_CAP	240
> +#define PD_T_PS_TRANSITION	500
> +#define PD_T_SRC_TRANSITION	35
> +#define PD_T_DRP_SNK		40
> +#define PD_T_DRP_SRC		30
> +#define PD_T_PS_SOURCE_OFF	920
> +#define PD_T_PS_SOURCE_ON	480
> +#define PD_T_PS_HARD_RESET	30
> +#define PD_T_SRC_RECOVER	760
> +#define PD_T_SRC_RECOVER_MAX	1000
> +#define PD_T_SRC_TURN_ON	275
> +#define PD_T_SAFE_0V		650
> +#define PD_T_VCONN_SOURCE_ON	100
> +#define PD_T_SINK_REQUEST	100	/* 100 ms minimum */
> +#define PD_T_ERROR_RECOVERY	100	/* minimum 25 is insufficient */
> +
> +#define PD_T_DRP_TRY		100	/* 75 - 150 ms */
> +#define PD_T_DRP_TRYWAIT	600	/* 400 - 800 ms */
> +
> +#define PD_T_CC_DEBOUNCE	200	/* 100 - 200 ms */
> +#define PD_T_PD_DEBOUNCE	20	/* 10 - 20 ms */
> +
> +#define PD_N_CAPS_COUNT		(PD_T_NO_RESPONSE / PD_T_SEND_SOURCE_CAP)
> +#define PD_N_HARD_RESET_COUNT	2
> +
> +#endif /* __LINUX_USB_PD_H */
> diff --git a/drivers/staging/typec/pd_bdo.h b/drivers/staging/typec/pd_bdo.h
> new file mode 100644
> index 000000000000..90b94d9fea5d
> --- /dev/null
> +++ b/drivers/staging/typec/pd_bdo.h
> @@ -0,0 +1,31 @@
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __LINUX_USB_PD_BDO_H
> +#define __LINUX_USB_PD_BDO_H
> +
> +/* BDO : BIST Data Object */
> +#define BDO_MODE_RECV		(0 << 28)
> +#define BDO_MODE_TRANSMIT	(1 << 28)
> +#define BDO_MODE_COUNTERS	(2 << 28)
> +#define BDO_MODE_CARRIER0	(3 << 28)
> +#define BDO_MODE_CARRIER1	(4 << 28)
> +#define BDO_MODE_CARRIER2	(5 << 28)
> +#define BDO_MODE_CARRIER3	(6 << 28)
> +#define BDO_MODE_EYE		(7 << 28)
> +#define BDO_MODE_TESTDATA	(8 << 28)
> +
> +#define BDO_MODE_MASK(mode)	((mode) & 0xf0000000)
> +
> +#endif
> diff --git a/drivers/staging/typec/pd_vdo.h b/drivers/staging/typec/pd_vdo.h
> new file mode 100644
> index 000000000000..dba172e0e0d1
> --- /dev/null
> +++ b/drivers/staging/typec/pd_vdo.h
> @@ -0,0 +1,249 @@
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __LINUX_USB_PD_VDO_H
> +#define __LINUX_USB_PD_VDO_H
> +
> +#include "pd.h"
> +
> +/*
> + * VDO : Vendor Defined Message Object
> + * VDM object is minimum of VDM header + 6 additional data objects.
> + */
> +
> +/*
> + * VDM header
> + * ----------
> + * <31:16>  :: SVID
> + * <15>     :: VDM type ( 1b == structured, 0b == unstructured )
> + * <14:13>  :: Structured VDM version (can only be 00 == 1.0 currently)
> + * <12:11>  :: reserved
> + * <10:8>   :: object position (1-7 valid ... used for enter/exit mode only)
> + * <7:6>    :: command type (SVDM only?)
> + * <5>      :: reserved (SVDM), command type (UVDM)
> + * <4:0>    :: command
> + */
> +#define VDO_MAX_SIZE 7
> +#define VDO(vid, type, custom)				\
> +	(((vid) << 16) |				\
> +	 ((type) << 15) |				\
> +	 ((custom) & 0x7FFF))
> +
> +#define VDO_SVDM_TYPE		(1 << 15)
> +#define VDO_SVDM_VERS(x)	((x) << 13)
> +#define VDO_OPOS(x)		((x) << 8)
> +#define VDO_CMDT(x)		((x) << 6)
> +#define VDO_OPOS_MASK		VDO_OPOS(0x7)
> +#define VDO_CMDT_MASK		VDO_CMDT(0x3)
> +
> +#define CMDT_INIT		0
> +#define CMDT_RSP_ACK		1
> +#define CMDT_RSP_NAK		2
> +#define CMDT_RSP_BUSY		3
> +
> +/* reserved for SVDM ... for Google UVDM */
> +#define VDO_SRC_INITIATOR	(0 << 5)
> +#define VDO_SRC_RESPONDER	(1 << 5)
> +
> +#define CMD_DISCOVER_IDENT	1
> +#define CMD_DISCOVER_SVID	2
> +#define CMD_DISCOVER_MODES	3
> +#define CMD_ENTER_MODE		4
> +#define CMD_EXIT_MODE		5
> +#define CMD_ATTENTION		6
> +
> +#define VDO_CMD_VENDOR(x)    (((10 + (x)) & 0x1f))
> +
> +/* ChromeOS specific commands */
> +#define VDO_CMD_VERSION		VDO_CMD_VENDOR(0)
> +#define VDO_CMD_SEND_INFO	VDO_CMD_VENDOR(1)
> +#define VDO_CMD_READ_INFO	VDO_CMD_VENDOR(2)
> +#define VDO_CMD_REBOOT		VDO_CMD_VENDOR(5)
> +#define VDO_CMD_FLASH_ERASE	VDO_CMD_VENDOR(6)
> +#define VDO_CMD_FLASH_WRITE	VDO_CMD_VENDOR(7)
> +#define VDO_CMD_ERASE_SIG	VDO_CMD_VENDOR(8)
> +#define VDO_CMD_PING_ENABLE	VDO_CMD_VENDOR(10)
> +#define VDO_CMD_CURRENT		VDO_CMD_VENDOR(11)
> +#define VDO_CMD_FLIP		VDO_CMD_VENDOR(12)
> +#define VDO_CMD_GET_LOG		VDO_CMD_VENDOR(13)
> +#define VDO_CMD_CCD_EN		VDO_CMD_VENDOR(14)
> +
> +#define PD_VDO_VID(vdo)		((vdo) >> 16)
> +#define PD_VDO_SVDM(vdo)	(((vdo) >> 15) & 1)
> +#define PD_VDO_OPOS(vdo)	(((vdo) >> 8) & 0x7)
> +#define PD_VDO_CMD(vdo)		((vdo) & 0x1f)
> +#define PD_VDO_CMDT(vdo)	(((vdo) >> 6) & 0x3)
> +
> +/*
> + * SVDM Identity request -> response
> + *
> + * Request is simply properly formatted SVDM header
> + *
> + * Response is 4 data objects:
> + * [0] :: SVDM header
> + * [1] :: Identitiy header
> + * [2] :: Cert Stat VDO
> + * [3] :: (Product | Cable) VDO
> + * [4] :: AMA VDO
> + *
> + */
> +#define VDO_INDEX_HDR		0
> +#define VDO_INDEX_IDH		1
> +#define VDO_INDEX_CSTAT		2
> +#define VDO_INDEX_CABLE		3
> +#define VDO_INDEX_PRODUCT	3
> +#define VDO_INDEX_AMA		4
> +
> +/*
> + * SVDM Identity Header
> + * --------------------
> + * <31>     :: data capable as a USB host
> + * <30>     :: data capable as a USB device
> + * <29:27>  :: product type
> + * <26>     :: modal operation supported (1b == yes)
> + * <25:16>  :: Reserved, Shall be set to zero
> + * <15:0>   :: USB-IF assigned VID for this cable vendor
> + */
> +#define IDH_PTYPE_UNDEF		0
> +#define IDH_PTYPE_HUB		1
> +#define IDH_PTYPE_PERIPH	2
> +#define IDH_PTYPE_PCABLE	3
> +#define IDH_PTYPE_ACABLE	4
> +#define IDH_PTYPE_AMA		5
> +
> +#define VDO_IDH(usbh, usbd, ptype, is_modal, vid)		\
> +	((usbh) << 31 | (usbd) << 30 | ((ptype) & 0x7) << 27	\
> +	 | (is_modal) << 26 | ((vid) & 0xffff))
> +
> +#define PD_IDH_PTYPE(vdo)	(((vdo) >> 27) & 0x7)
> +#define PD_IDH_VID(vdo)		((vdo) & 0xffff)
> +#define PD_IDH_MODAL_SUPP(vdo)	((vdo) & (1 << 26))
> +
> +/*
> + * Cert Stat VDO
> + * -------------
> + * <31:0>  : USB-IF assigned XID for this cable
> + */
> +#define PD_CSTAT_XID(vdo)	(vdo)
> +
> +/*
> + * Product VDO
> + * -----------
> + * <31:16> : USB Product ID
> + * <15:0>  : USB bcdDevice
> + */
> +#define VDO_PRODUCT(pid, bcd)	(((pid) & 0xffff) << 16 | ((bcd) & 0xffff))
> +#define PD_PRODUCT_PID(vdo)	(((vdo) >> 16) & 0xffff)
> +
> +/*
> + * Cable VDO
> + * ---------
> + * <31:28> :: Cable HW version
> + * <27:24> :: Cable FW version
> + * <23:20> :: Reserved, Shall be set to zero
> + * <19:18> :: type-C to Type-A/B/C (00b == A, 01 == B, 10 == C)
> + * <17>    :: Type-C to Plug/Receptacle (0b == plug, 1b == receptacle)
> + * <16:13> :: cable latency (0001 == <10ns(~1m length))
> + * <12:11> :: cable termination type (11b == both ends active VCONN req)
> + * <10>    :: SSTX1 Directionality support (0b == fixed, 1b == cfgable)
> + * <9>     :: SSTX2 Directionality support
> + * <8>     :: SSRX1 Directionality support
> + * <7>     :: SSRX2 Directionality support
> + * <6:5>   :: Vbus current handling capability
> + * <4>     :: Vbus through cable (0b == no, 1b == yes)
> + * <3>     :: SOP" controller present? (0b == no, 1b == yes)
> + * <2:0>   :: USB SS Signaling support
> + */
> +#define CABLE_ATYPE		0
> +#define CABLE_BTYPE		1
> +#define CABLE_CTYPE		2
> +#define CABLE_PLUG		0
> +#define CABLE_RECEPTACLE	1
> +#define CABLE_CURR_1A5		0
> +#define CABLE_CURR_3A		1
> +#define CABLE_CURR_5A		2
> +#define CABLE_USBSS_U2_ONLY	0
> +#define CABLE_USBSS_U31_GEN1	1
> +#define CABLE_USBSS_U31_GEN2	2
> +#define VDO_CABLE(hw, fw, cbl, gdr, lat, term, tx1d, tx2d, rx1d, rx2d, cur,\
> +		  vps, sopp, usbss) \
> +	(((hw) & 0x7) << 28 | ((fw) & 0x7) << 24 | ((cbl) & 0x3) << 18	\
> +	 | (gdr) << 17 | ((lat) & 0x7) << 13 | ((term) & 0x3) << 11	\
> +	 | (tx1d) << 10 | (tx2d) << 9 | (rx1d) << 8 | (rx2d) << 7	\
> +	 | ((cur) & 0x3) << 5 | (vps) << 4 | (sopp) << 3		\
> +	 | ((usbss) & 0x7))
> +
> +/*
> + * AMA VDO
> + * ---------
> + * <31:28> :: Cable HW version
> + * <27:24> :: Cable FW version
> + * <23:12> :: Reserved, Shall be set to zero
> + * <11>    :: SSTX1 Directionality support (0b == fixed, 1b == cfgable)
> + * <10>    :: SSTX2 Directionality support
> + * <9>     :: SSRX1 Directionality support
> + * <8>     :: SSRX2 Directionality support
> + * <7:5>   :: Vconn power
> + * <4>     :: Vconn power required
> + * <3>     :: Vbus power required
> + * <2:0>   :: USB SS Signaling support
> + */
> +#define VDO_AMA(hw, fw, tx1d, tx2d, rx1d, rx2d, vcpwr, vcr, vbr, usbss) \
> +	(((hw) & 0x7) << 28 | ((fw) & 0x7) << 24			\
> +	 | (tx1d) << 11 | (tx2d) << 10 | (rx1d) << 9 | (rx2d) << 8	\
> +	 | ((vcpwr) & 0x7) << 5 | (vcr) << 4 | (vbr) << 3		\
> +	 | ((usbss) & 0x7))
> +
> +#define PD_VDO_AMA_VCONN_REQ(vdo)	(((vdo) >> 4) & 1)
> +#define PD_VDO_AMA_VBUS_REQ(vdo)	(((vdo) >> 3) & 1)
> +
> +#define AMA_VCONN_PWR_1W	0
> +#define AMA_VCONN_PWR_1W5	1
> +#define AMA_VCONN_PWR_2W	2
> +#define AMA_VCONN_PWR_3W	3
> +#define AMA_VCONN_PWR_4W	4
> +#define AMA_VCONN_PWR_5W	5
> +#define AMA_VCONN_PWR_6W	6
> +#define AMA_USBSS_U2_ONLY	0
> +#define AMA_USBSS_U31_GEN1	1
> +#define AMA_USBSS_U31_GEN2	2
> +#define AMA_USBSS_BBONLY	3
> +
> +/*
> + * SVDM Discover SVIDs request -> response
> + *
> + * Request is properly formatted VDM Header with discover SVIDs command.
> + * Response is a set of SVIDs of all all supported SVIDs with all zero's to
> + * mark the end of SVIDs.  If more than 12 SVIDs are supported command SHOULD be
> + * repeated.
> + */
> +#define VDO_SVID(svid0, svid1)	(((svid0) & 0xffff) << 16 | ((svid1) & 0xffff))
> +#define PD_VDO_SVID_SVID0(vdo)	((vdo) >> 16)
> +#define PD_VDO_SVID_SVID1(vdo)	((vdo) & 0xffff)
> +
> +/* USB-IF SIDs */
> +#define USB_SID_PD		0xff00 /* power delivery */
> +#define USB_SID_DISPLAYPORT	0xff01
> +#define USB_SID_MHL		0xff02	/* Mobile High-Definition Link */
> +
> +/* VDM command timeouts (in ms) */
> +
> +#define PD_T_VDM_UNSTRUCTURED	500
> +#define PD_T_VDM_BUSY		100
> +#define PD_T_VDM_WAIT_MODE_E	100
> +#define PD_T_VDM_SNDR_RSP	30
> +#define PD_T_VDM_E_MODE		25
> +#define PD_T_VDM_RCVR_RSP	15
> +
> +#endif /* __LINUX_USB_PD_VDO_H */
> diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
> new file mode 100644
> index 000000000000..f40006eb42d4
> --- /dev/null
> +++ b/drivers/staging/typec/tcpm.c
> @@ -0,0 +1,3464 @@
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * USB Power Delivery protocol stack.
> + */
> +
> +#include <linux/completion.h>
> +#include <linux/debugfs.h>
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/proc_fs.h>
> +#include <linux/sched/clock.h>
> +#include <linux/seq_file.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/usb/typec.h>
> +#include <linux/workqueue.h>
> +
> +#include "pd.h"
> +#include "pd_vdo.h"
> +#include "pd_bdo.h"
> +#include "tcpm.h"
> +
> +#define FOREACH_STATE(S)			\
> +	S(INVALID_STATE),			\
> +	S(DRP_TOGGLING),			\
> +	S(SRC_UNATTACHED),			\
> +	S(SRC_ATTACH_WAIT),			\
> +	S(SRC_ATTACHED),			\
> +	S(SRC_STARTUP),				\
> +	S(SRC_SEND_CAPABILITIES),		\
> +	S(SRC_NEGOTIATE_CAPABILITIES),		\
> +	S(SRC_TRANSITION_SUPPLY),		\
> +	S(SRC_READY),				\
> +	S(SRC_WAIT_NEW_CAPABILITIES),		\
> +						\
> +	S(SNK_UNATTACHED),			\
> +	S(SNK_ATTACH_WAIT),			\
> +	S(SNK_DEBOUNCED),			\
> +	S(SNK_ATTACHED),			\
> +	S(SNK_STARTUP),				\
> +	S(SNK_DISCOVERY),			\
> +	S(SNK_DISCOVERY_DEBOUNCE),		\
> +	S(SNK_DISCOVERY_DEBOUNCE_DONE),		\
> +	S(SNK_WAIT_CAPABILITIES),		\
> +	S(SNK_NEGOTIATE_CAPABILITIES),		\
> +	S(SNK_TRANSITION_SINK),			\
> +	S(SNK_TRANSITION_SINK_VBUS),		\
> +	S(SNK_READY),				\
> +						\
> +	S(ACC_UNATTACHED),			\
> +	S(DEBUG_ACC_ATTACHED),			\
> +	S(AUDIO_ACC_ATTACHED),			\
> +	S(AUDIO_ACC_DEBOUNCE),			\
> +						\
> +	S(HARD_RESET_SEND),			\
> +	S(HARD_RESET_START),			\
> +	S(SRC_HARD_RESET_VBUS_OFF),		\
> +	S(SRC_HARD_RESET_VBUS_ON),		\
> +	S(SNK_HARD_RESET_SINK_OFF),		\
> +	S(SNK_HARD_RESET_WAIT_VBUS),		\
> +	S(SNK_HARD_RESET_SINK_ON),		\
> +						\
> +	S(SOFT_RESET),				\
> +	S(SOFT_RESET_SEND),			\
> +						\
> +	S(DR_SWAP_ACCEPT),			\
> +	S(DR_SWAP_SEND),			\
> +	S(DR_SWAP_SEND_TIMEOUT),		\
> +	S(DR_SWAP_CANCEL),			\
> +	S(DR_SWAP_CHANGE_DR),			\
> +						\
> +	S(PR_SWAP_ACCEPT),			\
> +	S(PR_SWAP_SEND),			\
> +	S(PR_SWAP_SEND_TIMEOUT),		\
> +	S(PR_SWAP_CANCEL),			\
> +	S(PR_SWAP_START),			\
> +	S(PR_SWAP_SRC_SNK_TRANSITION_OFF),	\
> +	S(PR_SWAP_SRC_SNK_SOURCE_OFF),		\
> +	S(PR_SWAP_SRC_SNK_SINK_ON),		\
> +	S(PR_SWAP_SNK_SRC_SINK_OFF),		\
> +	S(PR_SWAP_SNK_SRC_SOURCE_ON),		\
> +						\
> +	S(VCONN_SWAP_ACCEPT),			\
> +	S(VCONN_SWAP_SEND),			\
> +	S(VCONN_SWAP_SEND_TIMEOUT),		\
> +	S(VCONN_SWAP_CANCEL),			\
> +	S(VCONN_SWAP_START),			\
> +	S(VCONN_SWAP_WAIT_FOR_VCONN),		\
> +	S(VCONN_SWAP_TURN_ON_VCONN),		\
> +	S(VCONN_SWAP_TURN_OFF_VCONN),		\
> +						\
> +	S(SNK_TRY),				\
> +	S(SNK_TRY_WAIT),			\
> +	S(SRC_TRYWAIT),				\
> +	S(SRC_TRYWAIT_UNATTACHED),		\
> +						\
> +	S(SRC_TRY),				\
> +	S(SRC_TRY_DEBOUNCE),			\
> +	S(SNK_TRYWAIT),				\
> +	S(SNK_TRYWAIT_DEBOUNCE),		\
> +	S(SNK_TRYWAIT_VBUS),			\
> +	S(BIST_RX),				\
> +						\
> +	S(ERROR_RECOVERY),			\
> +	S(ERROR_RECOVERY_WAIT_OFF)
> +
> +#define GENERATE_ENUM(e)	e
> +#define GENERATE_STRING(s)	#s
> +
> +enum tcpm_state {
> +	FOREACH_STATE(GENERATE_ENUM)
> +};
> +
> +static const char * const tcpm_states[] = {
> +	FOREACH_STATE(GENERATE_STRING)
> +};
> +
> +enum vdm_states {
> +	VDM_STATE_ERR_BUSY = -3,
> +	VDM_STATE_ERR_SEND = -2,
> +	VDM_STATE_ERR_TMOUT = -1,
> +	VDM_STATE_DONE = 0,
> +	/* Anything >0 represents an active state */
> +	VDM_STATE_READY = 1,
> +	VDM_STATE_BUSY = 2,
> +	VDM_STATE_WAIT_RSP_BUSY = 3,
> +};
> +
> +enum pd_msg_request {
> +	PD_MSG_NONE = 0,
> +	PD_MSG_CTRL_REJECT,
> +	PD_MSG_CTRL_WAIT,
> +	PD_MSG_DATA_SINK_CAP,
> +	PD_MSG_DATA_SOURCE_CAP,
> +};
> +
> +/* Events from low level driver */
> +
> +#define TCPM_CC_EVENT		BIT(0)
> +#define TCPM_VBUS_EVENT		BIT(1)
> +#define TCPM_RESET_EVENT	BIT(2)
> +
> +#define LOG_BUFFER_ENTRIES	1024
> +#define LOG_BUFFER_ENTRY_SIZE	128
> +
> +/* Alternate mode support */
> +
> +#define SVID_DISCOVERY_MAX	16
> +
> +struct pd_mode_data {
> +	int svid_index;		/* current SVID index		*/
> +	int nsvids;
> +	u16 svids[SVID_DISCOVERY_MAX];
> +	int altmodes;		/* number of alternate modes	*/
> +	struct typec_altmode_desc altmode_desc[SVID_DISCOVERY_MAX];
> +};
> +
> +struct tcpm_port {
> +	struct device *dev;
> +
> +	struct mutex lock;		/* tcpm state machine lock */
> +	struct workqueue_struct *wq;
> +
> +	struct typec_capability typec_caps;
> +	struct typec_port *typec_port;
> +
> +	struct tcpc_dev	*tcpc;
> +
> +	enum typec_role vconn_role;
> +	enum typec_role pwr_role;
> +	enum typec_data_role data_role;
> +	enum typec_pwr_opmode pwr_opmode;
> +
> +	struct usb_pd_identity partner_ident;
> +	struct typec_partner_desc partner_desc;
> +	struct typec_partner *partner;
> +
> +	enum typec_cc_status cc_req;
> +
> +	enum typec_cc_status cc1;
> +	enum typec_cc_status cc2;
> +	enum typec_cc_polarity polarity;
> +
> +	bool attached;
> +	bool connected;
> +	bool vbus_present;
> +	bool vbus_never_low;
> +	bool vbus_source;
> +	bool vbus_charge;
> +
> +	bool send_discover;
> +	bool op_vsafe5v;
> +
> +	int try_role;
> +	int try_snk_count;
> +	int try_src_count;
> +
> +	enum pd_msg_request queued_message;
> +
> +	enum tcpm_state enter_state;
> +	enum tcpm_state prev_state;
> +	enum tcpm_state state;
> +	enum tcpm_state delayed_state;
> +	unsigned long delayed_runtime;
> +	unsigned long delay_ms;
> +
> +	spinlock_t pd_event_lock;
> +	u32 pd_events;
> +
> +	struct work_struct event_work;
> +	struct delayed_work state_machine;
> +	struct delayed_work vdm_state_machine;
> +	bool state_machine_running;
> +
> +	struct completion tx_complete;
> +	enum tcpm_transmit_status tx_status;
> +
> +	struct mutex swap_lock;		/* swap command lock */
> +	bool swap_pending;
> +	struct completion swap_complete;
> +	int swap_status;
> +
> +	unsigned int message_id;
> +	unsigned int caps_count;
> +	unsigned int hard_reset_count;
> +	bool pd_capable;
> +	bool explicit_contract;
> +
> +	/* Partner capabilities/requests */
> +	u32 sink_request;
> +	u32 source_caps[PDO_MAX_OBJECTS];
> +	unsigned int nr_source_caps;
> +	u32 sink_caps[PDO_MAX_OBJECTS];
> +	unsigned int nr_sink_caps;
> +
> +	/* Local capabilities */
> +	u32 src_pdo[PDO_MAX_OBJECTS];
> +	unsigned int nr_src_pdo;
> +	u32 snk_pdo[PDO_MAX_OBJECTS];
> +	unsigned int nr_snk_pdo;
> +
> +	unsigned int max_snk_mv;
> +	unsigned int max_snk_ma;
> +	unsigned int max_snk_mw;
> +	unsigned int operating_snk_mw;
> +
> +	/* Requested current / voltage */
> +	u32 current_limit;
> +	u32 supply_voltage;
> +
> +	u32 bist_request;
> +
> +	/* PD state for Vendor Defined Messages */
> +	enum vdm_states vdm_state;
> +	u32 vdm_retries;
> +	/* next Vendor Defined Message to send */
> +	u32 vdo_data[VDO_MAX_SIZE];
> +	u8 vdo_count;
> +	/* VDO to retry if UFP responder replied busy */
> +	u32 vdo_retry;
> +
> +	/* Alternate mode data */
> +
> +	struct pd_mode_data mode_data;
> +	struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX];
> +	struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX];
> +
> +#ifdef CONFIG_DEBUG_FS
> +	struct dentry *dentry;
> +	struct mutex logbuffer_lock;	/* log buffer access lock */
> +	int logbuffer_head;
> +	int logbuffer_tail;
> +	u8 *logbuffer[LOG_BUFFER_ENTRIES];
> +#endif
> +};
> +
> +struct pd_rx_event {
> +	struct work_struct work;
> +	struct tcpm_port *port;
> +	struct pd_message msg;
> +};
> +
> +#define tcpm_cc_is_sink(cc) \
> +	((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
> +	 (cc) == TYPEC_CC_RP_3_0)
> +
> +#define tcpm_port_is_sink(port) \
> +	((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
> +	 (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
> +
> +#define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
> +#define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
> +#define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
> +
> +#define tcpm_port_is_source(port) \
> +	((tcpm_cc_is_source((port)->cc1) && \
> +	 !tcpm_cc_is_source((port)->cc2)) || \
> +	 (tcpm_cc_is_source((port)->cc2) && \
> +	  !tcpm_cc_is_source((port)->cc1)))
> +
> +#define tcpm_port_is_debug(port) \
> +	(tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
> +
> +#define tcpm_port_is_audio(port) \
> +	(tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
> +
> +#define tcpm_port_is_audio_detached(port) \
> +	((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
> +	 (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
> +
> +#define tcpm_try_snk(port) \
> +	((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK)
> +
> +#define tcpm_try_src(port) \
> +	((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE)
> +
> +static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
> +{
> +	if (port->try_role == TYPEC_SINK)
> +		return SNK_UNATTACHED;
> +	else if (port->try_role == TYPEC_SOURCE)
> +		return SRC_UNATTACHED;
> +	else if (port->tcpc->config->default_role == TYPEC_SINK)
> +		return SNK_UNATTACHED;
> +	return SRC_UNATTACHED;
> +}
> +
> +static inline
> +struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
> +{
> +	return container_of(cap, struct tcpm_port, typec_caps);
> +}
> +
> +static bool tcpm_port_is_disconnected(struct tcpm_port *port)
> +{
> +	return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
> +		port->cc2 == TYPEC_CC_OPEN) ||
> +	       (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
> +				    port->cc1 == TYPEC_CC_OPEN) ||
> +				   (port->polarity == TYPEC_POLARITY_CC2 &&
> +				    port->cc2 == TYPEC_CC_OPEN)));
> +}
> +
> +/*
> + * Logging
> + */
> +
> +#ifdef CONFIG_DEBUG_FS
> +
> +static bool tcpm_log_full(struct tcpm_port *port)
> +{
> +	return port->logbuffer_tail ==
> +		(port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
> +}
> +
> +static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
> +{
> +	char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
> +	u64 ts_nsec = local_clock();
> +	unsigned long rem_nsec;
> +
> +	if (!port->logbuffer[port->logbuffer_head]) {
> +		port->logbuffer[port->logbuffer_head] =
> +				kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
> +		if (!port->logbuffer[port->logbuffer_head])
> +			return;
> +	}
> +
> +	vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
> +
> +	mutex_lock(&port->logbuffer_lock);
> +
> +	if (tcpm_log_full(port)) {
> +		port->logbuffer_head = max(port->logbuffer_head - 1, 0);
> +		strcpy(tmpbuffer, "overflow");
> +	}
> +
> +	if (port->logbuffer_head < 0 ||
> +	    port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
> +		dev_warn(port->dev,
> +			 "Bad log buffer index %d\n", port->logbuffer_head);
> +		goto abort;
> +	}
> +
> +	if (!port->logbuffer[port->logbuffer_head]) {
> +		dev_warn(port->dev,
> +			 "Log buffer index %d is NULL\n", port->logbuffer_head);
> +		goto abort;
> +	}
> +
> +	rem_nsec = do_div(ts_nsec, 1000000000);
> +	scnprintf(port->logbuffer[port->logbuffer_head],
> +		  LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
> +		  (unsigned long)ts_nsec, rem_nsec / 1000,
> +		  tmpbuffer);
> +	port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
> +
> +abort:
> +	mutex_unlock(&port->logbuffer_lock);
> +}
> +
> +static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
> +{
> +	va_list args;
> +
> +	/* Do not log while disconnected and unattached */
> +	if (tcpm_port_is_disconnected(port) &&
> +	    (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
> +	     port->state == DRP_TOGGLING))
> +		return;
> +
> +	va_start(args, fmt);
> +	_tcpm_log(port, fmt, args);
> +	va_end(args);
> +}
> +
> +static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
> +{
> +	va_list args;
> +
> +	va_start(args, fmt);
> +	_tcpm_log(port, fmt, args);
> +	va_end(args);
> +}
> +
> +static void tcpm_log_source_caps(struct tcpm_port *port)
> +{
> +	int i;
> +
> +	for (i = 0; i < port->nr_source_caps; i++) {
> +		u32 pdo = port->source_caps[i];
> +		enum pd_pdo_type type = pdo_type(pdo);
> +		char msg[64];
> +
> +		switch (type) {
> +		case PDO_TYPE_FIXED:
> +			scnprintf(msg, sizeof(msg),
> +				  "%u mV, %u mA [%s%s%s%s%s%s]",
> +				  pdo_fixed_voltage(pdo),
> +				  pdo_max_current(pdo),
> +				  (pdo & PDO_FIXED_DUAL_ROLE) ?
> +							"R" : "",
> +				  (pdo & PDO_FIXED_SUSPEND) ?
> +							"S" : "",
> +				  (pdo & PDO_FIXED_HIGHER_CAP) ?
> +							"H" : "",
> +				  (pdo & PDO_FIXED_USB_COMM) ?
> +							"U" : "",
> +				  (pdo & PDO_FIXED_DATA_SWAP) ?
> +							"D" : "",
> +				  (pdo & PDO_FIXED_EXTPOWER) ?
> +							"E" : "");
> +			break;
> +		case PDO_TYPE_VAR:
> +			scnprintf(msg, sizeof(msg),
> +				  "%u-%u mV, %u mA",
> +				  pdo_min_voltage(pdo),
> +				  pdo_max_voltage(pdo),
> +				  pdo_max_current(pdo));
> +			break;
> +		case PDO_TYPE_BATT:
> +			scnprintf(msg, sizeof(msg),
> +				  "%u-%u mV, %u mW",
> +				  pdo_min_voltage(pdo),
> +				  pdo_max_voltage(pdo),
> +				  pdo_max_power(pdo));
> +			break;
> +		default:
> +			strcpy(msg, "undefined");
> +			break;
> +		}
> +		tcpm_log(port, " PDO %d: type %d, %s",
> +			 i, type, msg);
> +	}
> +}
> +
> +static int tcpm_seq_show(struct seq_file *s, void *v)
> +{
> +	struct tcpm_port *port = (struct tcpm_port *)s->private;
> +	int tail;
> +
> +	mutex_lock(&port->logbuffer_lock);
> +	tail = port->logbuffer_tail;
> +	while (tail != port->logbuffer_head) {
> +		seq_printf(s, "%s\n", port->logbuffer[tail]);
> +		tail = (tail + 1) % LOG_BUFFER_ENTRIES;
> +	}
> +	if (!seq_has_overflowed(s))
> +		port->logbuffer_tail = tail;
> +	mutex_unlock(&port->logbuffer_lock);
> +
> +	return 0;
> +}
> +
> +static int tcpm_debug_open(struct inode *inode, struct file *file)
> +{
> +	return single_open(file, tcpm_seq_show, inode->i_private);
> +}
> +
> +static const struct file_operations tcpm_debug_operations = {
> +	.open		= tcpm_debug_open,
> +	.llseek		= seq_lseek,
> +	.read		= seq_read,
> +	.release	= single_release,
> +};
> +
> +static struct dentry *rootdir;
> +
> +static int tcpm_debugfs_init(struct tcpm_port *port)
> +{
> +	mutex_init(&port->logbuffer_lock);
> +	/* /sys/kernel/debug/tcpm/usbcX */
> +	if (!rootdir) {
> +		rootdir = debugfs_create_dir("tcpm", NULL);
> +		if (!rootdir)
> +			return -ENOMEM;
> +	}
> +
> +	port->dentry = debugfs_create_file(dev_name(port->dev),
> +					   S_IFREG | 0444, rootdir,
> +					   port, &tcpm_debug_operations);
> +
> +	return 0;
> +}
> +
> +static void tcpm_debugfs_exit(struct tcpm_port *port)
> +{
> +	debugfs_remove(port->dentry);
> +}
> +
> +#else
> +
> +static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
> +static void tcpm_log_source_caps(struct tcpm_port *port) { }
> +static int tcpm_debugfs_init(const struct tcpm_port *port) { return 0; }
> +static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
> +
> +#endif
> +
> +static int tcpm_pd_transmit(struct tcpm_port *port,
> +			    enum tcpm_transmit_type type,
> +			    const struct pd_message *msg)
> +{
> +	unsigned long timeout;
> +	int ret;
> +
> +	if (msg)
> +		tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
> +	else
> +		tcpm_log(port, "PD TX, type: %#x", type);
> +
> +	reinit_completion(&port->tx_complete);
> +	ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
> +	if (ret < 0)
> +		return ret;
> +
> +	mutex_unlock(&port->lock);
> +	timeout = wait_for_completion_timeout(&port->tx_complete,
> +				msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
> +	mutex_lock(&port->lock);
> +	if (!timeout)
> +		return -ETIMEDOUT;
> +
> +	switch (port->tx_status) {
> +	case TCPC_TX_SUCCESS:
> +		port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
> +		return 0;
> +	case TCPC_TX_DISCARDED:
> +		return -EAGAIN;
> +	case TCPC_TX_FAILED:
> +	default:
> +		return -EIO;
> +	}
> +}
> +
> +void tcpm_pd_transmit_complete(struct tcpm_port *port,
> +			       enum tcpm_transmit_status status)
> +{
> +	tcpm_log(port, "PD TX complete, status: %u", status);
> +	port->tx_status = status;
> +	complete(&port->tx_complete);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
> +
> +static int tcpm_mux_set(struct tcpm_port *port, enum tcpc_mux_mode mode,
> +			enum tcpc_usb_switch config)
> +{
> +	int ret = 0;
> +
> +	tcpm_log(port, "Requesting mux mode %d, config %d, polarity %d",
> +		 mode, config, port->polarity);
> +
> +	if (port->tcpc->mux)
> +		ret = port->tcpc->mux->set(port->tcpc->mux, mode, config,
> +					   port->polarity);
> +
> +	return ret;
> +}
> +
> +static int tcpm_set_polarity(struct tcpm_port *port,
> +			     enum typec_cc_polarity polarity)
> +{
> +	int ret;
> +
> +	tcpm_log(port, "polarity %d", polarity);
> +
> +	ret = port->tcpc->set_polarity(port->tcpc, polarity);
> +	if (ret < 0)
> +		return ret;
> +
> +	port->polarity = polarity;
> +
> +	return 0;
> +}
> +
> +static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
> +{
> +	int ret;
> +
> +	tcpm_log(port, "vconn:=%d", enable);
> +
> +	ret = port->tcpc->set_vconn(port->tcpc, enable);
> +	if (!ret) {
> +		port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
> +		typec_set_vconn_role(port->typec_port, port->vconn_role);
> +	}
> +
> +	return ret;
> +}
> +
> +static u32 tcpm_get_current_limit(struct tcpm_port *port)
> +{
> +	enum typec_cc_status cc;
> +	u32 limit;
> +
> +	cc = port->polarity ? port->cc2 : port->cc1;
> +	switch (cc) {
> +	case TYPEC_CC_RP_1_5:
> +		limit = 1500;
> +		break;
> +	case TYPEC_CC_RP_3_0:
> +		limit = 3000;
> +		break;
> +	case TYPEC_CC_RP_DEF:
> +	default:
> +		limit = 0;
> +		break;
> +	}
> +
> +	return limit;
> +}
> +
> +static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
> +{
> +	int ret = -EOPNOTSUPP;
> +
> +	tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
> +
> +	if (port->tcpc->set_current_limit)
> +		ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
> +
> +	return ret;
> +}
> +
> +/*
> + * Determine RP value to set based on maximum current supported
> + * by a port if configured as source.
> + * Returns CC value to report to link partner.
> + */
> +static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
> +{
> +	const u32 *src_pdo = port->src_pdo;
> +	int nr_pdo = port->nr_src_pdo;
> +	int i;
> +
> +	/*
> +	 * Search for first entry with matching voltage.
> +	 * It should report the maximum supported current.
> +	 */
> +	for (i = 0; i < nr_pdo; i++) {
> +		const u32 pdo = src_pdo[i];
> +
> +		if (pdo_type(pdo) == PDO_TYPE_FIXED &&
> +		    pdo_fixed_voltage(pdo) == 5000) {
> +			unsigned int curr = pdo_max_current(pdo);
> +
> +			if (curr >= 3000)
> +				return TYPEC_CC_RP_3_0;
> +			else if (curr >= 1500)
> +				return TYPEC_CC_RP_1_5;
> +			return TYPEC_CC_RP_DEF;
> +		}
> +	}
> +
> +	return TYPEC_CC_RP_DEF;
> +}
> +
> +static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
> +{
> +	return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
> +				     port->data_role);
> +}
> +
> +static int tcpm_set_roles(struct tcpm_port *port, bool attached,
> +			  enum typec_role role, enum typec_data_role data)
> +{
> +	int ret;
> +
> +	if (data == TYPEC_HOST)
> +		ret = tcpm_mux_set(port, TYPEC_MUX_USB,
> +				   TCPC_USB_SWITCH_CONNECT);
> +	else
> +		ret = tcpm_mux_set(port, TYPEC_MUX_NONE,
> +				   TCPC_USB_SWITCH_DISCONNECT);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
> +	if (ret < 0)
> +		return ret;
> +
> +	port->pwr_role = role;
> +	port->data_role = data;
> +	typec_set_data_role(port->typec_port, data);
> +	typec_set_pwr_role(port->typec_port, role);
> +
> +	return 0;
> +}
> +
> +static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
> +{
> +	int ret;
> +
> +	ret = port->tcpc->set_roles(port->tcpc, true, role,
> +				    port->data_role);
> +	if (ret < 0)
> +		return ret;
> +
> +	port->pwr_role = role;
> +	typec_set_pwr_role(port->typec_port, role);
> +
> +	return 0;
> +}
> +
> +static int tcpm_pd_send_source_caps(struct tcpm_port *port)
> +{
> +	struct pd_message msg;
> +	int i;
> +
> +	memset(&msg, 0, sizeof(msg));
> +	if (!port->nr_src_pdo) {
> +		/* No source capabilities defined, sink only */
> +		msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
> +					  port->pwr_role,
> +					  port->data_role,
> +					  port->message_id, 0);
> +	} else {
> +		msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
> +					  port->pwr_role,
> +					  port->data_role,
> +					  port->message_id,
> +					  port->nr_src_pdo);
> +	}
> +	for (i = 0; i < port->nr_src_pdo; i++)
> +		msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
> +
> +	return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> +}
> +
> +static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
> +{
> +	struct pd_message msg;
> +	int i;
> +
> +	memset(&msg, 0, sizeof(msg));
> +	if (!port->nr_snk_pdo) {
> +		/* No sink capabilities defined, source only */
> +		msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
> +					  port->pwr_role,
> +					  port->data_role,
> +					  port->message_id, 0);
> +	} else {
> +		msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
> +					  port->pwr_role,
> +					  port->data_role,
> +					  port->message_id,
> +					  port->nr_snk_pdo);
> +	}
> +	for (i = 0; i < port->nr_snk_pdo; i++)
> +		msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
> +
> +	return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> +}
> +
> +static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
> +			   unsigned int delay_ms)
> +{
> +	if (delay_ms) {
> +		tcpm_log(port, "pending state change %s -> %s @ %u ms",
> +			 tcpm_states[port->state], tcpm_states[state],
> +			 delay_ms);
> +		port->delayed_state = state;
> +		mod_delayed_work(port->wq, &port->state_machine,
> +				 msecs_to_jiffies(delay_ms));
> +		port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
> +		port->delay_ms = delay_ms;
> +	} else {
> +		tcpm_log(port, "state change %s -> %s",
> +			 tcpm_states[port->state], tcpm_states[state]);
> +		port->delayed_state = INVALID_STATE;
> +		port->prev_state = port->state;
> +		port->state = state;
> +		/*
> +		 * Don't re-queue the state machine work item if we're currently
> +		 * in the state machine and we're immediately changing states.
> +		 * tcpm_state_machine_work() will continue running the state
> +		 * machine.
> +		 */
> +		if (!port->state_machine_running)
> +			mod_delayed_work(port->wq, &port->state_machine, 0);
> +	}
> +}
> +
> +static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
> +				unsigned int delay_ms)
> +{
> +	if (port->enter_state == port->state)
> +		tcpm_set_state(port, state, delay_ms);
> +	else
> +		tcpm_log(port,
> +			 "skipped %sstate change %s -> %s [%u ms], context state %s",
> +			 delay_ms ? "delayed " : "",
> +			 tcpm_states[port->state], tcpm_states[state],
> +			 delay_ms, tcpm_states[port->enter_state]);
> +}
> +
> +static void tcpm_queue_message(struct tcpm_port *port,
> +			       enum pd_msg_request message)
> +{
> +	port->queued_message = message;
> +	mod_delayed_work(port->wq, &port->state_machine, 0);
> +}
> +
> +/*
> + * VDM/VDO handling functions
> + */
> +static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
> +			   const u32 *data, int cnt)
> +{
> +	port->vdo_count = cnt + 1;
> +	port->vdo_data[0] = header;
> +	memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
> +	/* Set ready, vdm state machine will actually send */
> +	port->vdm_retries = 0;
> +	port->vdm_state = VDM_STATE_READY;
> +}
> +
> +static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
> +				  int cnt)
> +{
> +	u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
> +	u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
> +
> +	memset(&port->mode_data, 0, sizeof(port->mode_data));
> +
> +#if 0 /* Not really a match */
> +	switch (PD_IDH_PTYPE(vdo)) {
> +	case IDH_PTYPE_UNDEF:
> +		port->partner.type = TYPEC_PARTNER_NONE; /* no longer exists */
> +		break;
> +	case IDH_PTYPE_HUB:
> +		break;
> +	case IDH_PTYPE_PERIPH:
> +		break;
> +	case IDH_PTYPE_PCABLE:
> +		break;
> +	case IDH_PTYPE_ACABLE:
> +		break;
> +	case IDH_PTYPE_AMA:
> +		port->partner.type = TYPEC_PARTNER_ALTMODE;
> +		break;
> +	default:
> +		break;
> +	}
> +#endif
> +
> +	port->partner_ident.id_header = vdo;
> +	port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
> +	port->partner_ident.product = product;
> +
> +	typec_partner_set_identity(port->partner);
> +
> +	tcpm_log(port, "Identity: %04x:%04x.%04x",
> +		 PD_IDH_VID(vdo),
> +		 PD_PRODUCT_PID(product), product & 0xffff);
> +}
> +
> +static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
> +			       int cnt)
> +{
> +	struct pd_mode_data *pmdata = &port->mode_data;
> +	int i;
> +
> +	for (i = 1; i < cnt; i++) {
> +		u32 p = le32_to_cpu(payload[i]);
> +		u16 svid;
> +
> +		svid = (p >> 16) & 0xffff;
> +		if (!svid)
> +			return false;
> +
> +		if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
> +			goto abort;
> +
> +		pmdata->svids[pmdata->nsvids++] = svid;
> +		tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
> +
> +		svid = p & 0xffff;
> +		if (!svid)
> +			return false;
> +
> +		if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
> +			goto abort;
> +
> +		pmdata->svids[pmdata->nsvids++] = svid;
> +		tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
> +	}
> +	return true;
> +abort:
> +	tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
> +	return false;
> +}
> +
> +static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
> +			       int cnt)
> +{
> +	struct pd_mode_data *pmdata = &port->mode_data;
> +	struct typec_altmode_desc *paltmode;
> +	struct typec_mode_desc *pmode;
> +	int i;
> +
> +	if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
> +		/* Already logged in svdm_consume_svids() */
> +		return;
> +	}
> +
> +	paltmode = &pmdata->altmode_desc[pmdata->altmodes];
> +	memset(paltmode, 0, sizeof(*paltmode));
> +
> +	paltmode->svid = pmdata->svids[pmdata->svid_index];
> +
> +	tcpm_log(port, " Alternate mode %d: SVID 0x%04x",
> +		 pmdata->altmodes, paltmode->svid);
> +
> +	for (i = 1; i < cnt && paltmode->n_modes < ALTMODE_MAX_MODES; i++) {
> +		pmode = &paltmode->modes[paltmode->n_modes];
> +		memset(pmode, 0, sizeof(*pmode));
> +		pmode->vdo = le32_to_cpu(payload[i]);
> +		pmode->index = i - 1;
> +		paltmode->n_modes++;
> +		tcpm_log(port, "  VDO %d: 0x%08x",
> +			 pmode->index, pmode->vdo);
> +	}
> +	port->partner_altmode[pmdata->altmodes] =
> +		typec_partner_register_altmode(port->partner, paltmode);
> +	if (port->partner_altmode[pmdata->altmodes] == NULL) {
> +		tcpm_log(port,
> +			 "Failed to register alternate modes for SVID 0x%04x",
> +			 paltmode->svid);
> +		return;
> +	}
> +	pmdata->altmodes++;
> +}
> +
> +#define supports_modal(port)	PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
> +
> +static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
> +			u32 *response)
> +{
> +	u32 p0 = le32_to_cpu(payload[0]);
> +	int cmd_type = PD_VDO_CMDT(p0);
> +	int cmd = PD_VDO_CMD(p0);
> +	struct pd_mode_data *modep;
> +	int rlen = 0;
> +	u16 svid;
> +
> +	tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
> +		 p0, cmd_type, cmd, cnt);
> +
> +	modep = &port->mode_data;
> +
> +	switch (cmd_type) {
> +	case CMDT_INIT:
> +		switch (cmd) {
> +		case CMD_DISCOVER_IDENT:
> +			break;
> +		case CMD_DISCOVER_SVID:
> +			break;
> +		case CMD_DISCOVER_MODES:
> +			break;
> +		case CMD_ENTER_MODE:
> +			break;
> +		case CMD_EXIT_MODE:
> +			break;
> +		case CMD_ATTENTION:
> +			break;
> +		default:
> +			break;
> +		}
> +		if (rlen >= 1) {
> +			response[0] = p0 | VDO_CMDT(CMDT_RSP_ACK);
> +		} else if (rlen == 0) {
> +			response[0] = p0 | VDO_CMDT(CMDT_RSP_NAK);
> +			rlen = 1;
> +		} else {
> +			response[0] = p0 | VDO_CMDT(CMDT_RSP_BUSY);
> +			rlen = 1;
> +		}
> +		break;
> +	case CMDT_RSP_ACK:
> +		/* silently drop message if we are not connected */
> +		if (!port->partner)
> +			break;
> +
> +		switch (cmd) {
> +		case CMD_DISCOVER_IDENT:
> +			/* 6.4.4.3.1 */
> +			svdm_consume_identity(port, payload, cnt);
> +			response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
> +			rlen = 1;
> +			break;
> +		case CMD_DISCOVER_SVID:
> +			/* 6.4.4.3.2 */
> +			if (svdm_consume_svids(port, payload, cnt)) {
> +				response[0] = VDO(USB_SID_PD, 1,
> +						  CMD_DISCOVER_SVID);
> +				rlen = 1;
> +			} else if (modep->nsvids && supports_modal(port)) {
> +				response[0] = VDO(modep->svids[0], 1,
> +						  CMD_DISCOVER_MODES);
> +				rlen = 1;
> +			}
> +			break;
> +		case CMD_DISCOVER_MODES:
> +			/* 6.4.4.3.3 */
> +			svdm_consume_modes(port, payload, cnt);
> +			modep->svid_index++;
> +			if (modep->svid_index < modep->nsvids) {
> +				svid = modep->svids[modep->svid_index];
> +				response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
> +				rlen = 1;
> +			} else {
> +#if 0
> +				response[0] = pd_dfp_enter_mode(port, 0, 0);
> +				if (response[0])
> +					rlen = 1;
> +#endif
> +			}
> +			break;
> +		case CMD_ENTER_MODE:
> +			break;
> +		default:
> +			break;
> +		}
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	return rlen;
> +}
> +
> +static void tcpm_handle_vdm_request(struct tcpm_port *port,
> +				    const __le32 *payload, int cnt)
> +{
> +	int rlen = 0;
> +	u32 response[8] = { };
> +	u32 p0 = le32_to_cpu(payload[0]);
> +
> +	if (port->vdm_state == VDM_STATE_BUSY) {
> +		/* If UFP responded busy retry after timeout */
> +		if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
> +			port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
> +			port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
> +				CMDT_INIT;
> +			mod_delayed_work(port->wq, &port->vdm_state_machine,
> +					 msecs_to_jiffies(PD_T_VDM_BUSY));
> +			return;
> +		}
> +		port->vdm_state = VDM_STATE_DONE;
> +	}
> +
> +	if (PD_VDO_SVDM(p0))
> +		rlen = tcpm_pd_svdm(port, payload, cnt, response);
> +#if 0
> +	else
> +		rlen = tcpm_pd_custom_vdm(port, cnt, payload, response);
> +#endif
> +
> +	if (rlen > 0) {
> +		tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
> +		mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
> +	}
> +}
> +
> +static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
> +			  const u32 *data, int count)
> +{
> +	u32 header;
> +
> +	if (WARN_ON(count > VDO_MAX_SIZE - 1))
> +		count = VDO_MAX_SIZE - 1;
> +
> +	/* set VDM header with VID & CMD */
> +	header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
> +			1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
> +	tcpm_queue_vdm(port, header, data, count);
> +
> +	mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
> +}
> +
> +static unsigned int vdm_ready_timeout(u32 vdm_hdr)
> +{
> +	unsigned int timeout;
> +	int cmd = PD_VDO_CMD(vdm_hdr);
> +
> +	/* its not a structured VDM command */
> +	if (!PD_VDO_SVDM(vdm_hdr))
> +		return PD_T_VDM_UNSTRUCTURED;
> +
> +	switch (PD_VDO_CMDT(vdm_hdr)) {
> +	case CMDT_INIT:
> +		if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
> +			timeout = PD_T_VDM_WAIT_MODE_E;
> +		else
> +			timeout = PD_T_VDM_SNDR_RSP;
> +		break;
> +	default:
> +		if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
> +			timeout = PD_T_VDM_E_MODE;
> +		else
> +			timeout = PD_T_VDM_RCVR_RSP;
> +		break;
> +	}
> +	return timeout;
> +}
> +
> +static void vdm_run_state_machine(struct tcpm_port *port)
> +{
> +	struct pd_message msg;
> +	int i, res;
> +
> +	switch (port->vdm_state) {
> +	case VDM_STATE_READY:
> +		/* Only transmit VDM if attached */
> +		if (!port->attached) {
> +			port->vdm_state = VDM_STATE_ERR_BUSY;
> +			break;
> +		}
> +
> +		/*
> +		 * if there's traffic or we're not in PDO ready state don't send
> +		 * a VDM.
> +		 */
> +		if (port->state != SRC_READY && port->state != SNK_READY)
> +			break;
> +
> +		/* Prepare and send VDM */
> +		memset(&msg, 0, sizeof(msg));
> +		msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
> +					  port->pwr_role,
> +					  port->data_role,
> +					  port->message_id, port->vdo_count);
> +		for (i = 0; i < port->vdo_count; i++)
> +			msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
> +		res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> +		if (res < 0) {
> +			port->vdm_state = VDM_STATE_ERR_SEND;
> +		} else {
> +			unsigned long timeout;
> +
> +			port->vdm_retries = 0;
> +			port->vdm_state = VDM_STATE_BUSY;
> +			timeout = vdm_ready_timeout(port->vdo_data[0]);
> +			mod_delayed_work(port->wq, &port->vdm_state_machine,
> +					 timeout);
> +		}
> +		break;
> +	case VDM_STATE_WAIT_RSP_BUSY:
> +		port->vdo_data[0] = port->vdo_retry;
> +		port->vdo_count = 1;
> +		port->vdm_state = VDM_STATE_READY;
> +		break;
> +	case VDM_STATE_BUSY:
> +		port->vdm_state = VDM_STATE_ERR_TMOUT;
> +		break;
> +	case VDM_STATE_ERR_SEND:
> +		/*
> +		 * A partner which does not support USB PD will not reply,
> +		 * so this is not a fatal error. At the same time, some
> +		 * devices may not return GoodCRC under some circumstances,
> +		 * so we need to retry.
> +		 */
> +		if (port->vdm_retries < 3) {
> +			tcpm_log(port, "VDM Tx error, retry");
> +			port->vdm_retries++;
> +			port->vdm_state = VDM_STATE_READY;
> +		}
> +		break;
> +	default:
> +		break;
> +	}
> +}
> +
> +static void vdm_state_machine_work(struct work_struct *work)
> +{
> +	struct tcpm_port *port = container_of(work, struct tcpm_port,
> +					      vdm_state_machine.work);
> +	enum vdm_states prev_state;
> +
> +	mutex_lock(&port->lock);
> +
> +	/*
> +	 * Continue running as long as the port is not busy and there was
> +	 * a state change.
> +	 */
> +	do {
> +		prev_state = port->vdm_state;
> +		vdm_run_state_machine(port);
> +	} while (port->vdm_state != prev_state &&
> +		 port->vdm_state != VDM_STATE_BUSY);
> +
> +	mutex_unlock(&port->lock);
> +}
> +
> +/*
> + * PD (data, control) command handling functions
> + */
> +static void tcpm_pd_data_request(struct tcpm_port *port,
> +				 const struct pd_message *msg)
> +{
> +	enum pd_data_msg_type type = pd_header_type_le(msg->header);
> +	unsigned int cnt = pd_header_cnt_le(msg->header);
> +	unsigned int i;
> +
> +	switch (type) {
> +	case PD_DATA_SOURCE_CAP:
> +		if (port->pwr_role != TYPEC_SINK)
> +			break;
> +
> +		for (i = 0; i < cnt; i++)
> +			port->source_caps[i] = le32_to_cpu(msg->payload[i]);
> +
> +		port->nr_source_caps = cnt;
> +
> +		tcpm_log_source_caps(port);
> +
> +		/*
> +		 * This message may be received even if VBUS is not
> +		 * present. This is quite unexpected; see USB PD
> +		 * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
> +		 * However, at the same time, we must be ready to
> +		 * receive this message and respond to it 15ms after
> +		 * receiving PS_RDY during power swap operations, no matter
> +		 * if VBUS is available or not (USB PD specification,
> +		 * section 6.5.9.2).
> +		 * So we need to accept the message either way,
> +		 * but be prepared to keep waiting for VBUS after it was
> +		 * handled.
> +		 */
> +		tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
> +		break;
> +	case PD_DATA_REQUEST:
> +		if (port->pwr_role != TYPEC_SOURCE ||
> +		    cnt != 1) {
> +			tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> +			break;
> +		}
> +		port->sink_request = le32_to_cpu(msg->payload[0]);
> +		tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
> +		break;
> +	case PD_DATA_SINK_CAP:
> +		/* We don't do anything with this at the moment... */
> +		for (i = 0; i < cnt; i++)
> +			port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
> +		port->nr_sink_caps = cnt;
> +		break;
> +	case PD_DATA_VENDOR_DEF:
> +		tcpm_handle_vdm_request(port, msg->payload, cnt);
> +		break;
> +	case PD_DATA_BIST:
> +		if (port->state == SRC_READY || port->state == SNK_READY) {
> +			port->bist_request = le32_to_cpu(msg->payload[0]);
> +			tcpm_set_state(port, BIST_RX, 0);
> +		}
> +		break;
> +	default:
> +		tcpm_log(port, "Unhandled data message type %#x", type);
> +		break;
> +	}
> +}
> +
> +static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> +				 const struct pd_message *msg)
> +{
> +	enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
> +	enum tcpm_state next_state;
> +
> +	switch (type) {
> +	case PD_CTRL_GOOD_CRC:
> +	case PD_CTRL_PING:
> +		break;
> +	case PD_CTRL_GET_SOURCE_CAP:
> +		switch (port->state) {
> +		case SRC_READY:
> +		case SNK_READY:
> +			tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
> +			break;
> +		default:
> +			tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> +			break;
> +		}
> +		break;
> +	case PD_CTRL_GET_SINK_CAP:
> +		switch (port->state) {
> +		case SRC_READY:
> +		case SNK_READY:
> +			tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
> +			break;
> +		default:
> +			tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> +			break;
> +		}
> +		break;
> +	case PD_CTRL_GOTO_MIN:
> +		break;
> +	case PD_CTRL_PS_RDY:
> +		switch (port->state) {
> +		case SNK_TRANSITION_SINK:
> +			if (port->vbus_present) {
> +				tcpm_set_current_limit(port,
> +						       port->current_limit,
> +						       port->supply_voltage);
> +				tcpm_set_state(port, SNK_READY, 0);
> +			} else {
> +				/*
> +				 * Seen after power swap. Keep waiting for VBUS
> +				 * in a transitional state.
> +				 */
> +				tcpm_set_state(port,
> +					       SNK_TRANSITION_SINK_VBUS, 0);
> +			}
> +			break;
> +		case PR_SWAP_SRC_SNK_SOURCE_OFF:
> +			tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
> +			break;
> +		case PR_SWAP_SNK_SRC_SINK_OFF:
> +			tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
> +			break;
> +		case VCONN_SWAP_WAIT_FOR_VCONN:
> +			tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
> +			break;
> +		default:
> +			break;
> +		}
> +		break;
> +	case PD_CTRL_REJECT:
> +	case PD_CTRL_WAIT:
> +		switch (port->state) {
> +		case SNK_NEGOTIATE_CAPABILITIES:
> +			/* USB PD specification, Figure 8-43 */
> +			if (port->explicit_contract)
> +				next_state = SNK_READY;
> +			else
> +				next_state = SNK_WAIT_CAPABILITIES;
> +			tcpm_set_state(port, next_state, 0);
> +			break;
> +		case DR_SWAP_SEND:
> +			port->swap_status = (type == PD_CTRL_WAIT ?
> +					     -EAGAIN : -EOPNOTSUPP);
> +			tcpm_set_state(port, DR_SWAP_CANCEL, 0);
> +			break;
> +		case PR_SWAP_SEND:
> +			port->swap_status = (type == PD_CTRL_WAIT ?
> +					     -EAGAIN : -EOPNOTSUPP);
> +			tcpm_set_state(port, PR_SWAP_CANCEL, 0);
> +			break;
> +		case VCONN_SWAP_SEND:
> +			port->swap_status = (type == PD_CTRL_WAIT ?
> +					     -EAGAIN : -EOPNOTSUPP);
> +			tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
> +			break;
> +		default:
> +			break;
> +		}
> +		break;
> +	case PD_CTRL_ACCEPT:
> +		switch (port->state) {
> +		case SNK_NEGOTIATE_CAPABILITIES:
> +			tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
> +			break;
> +		case SOFT_RESET_SEND:
> +			port->message_id = 0;
> +			if (port->pwr_role == TYPEC_SOURCE)
> +				next_state = SRC_SEND_CAPABILITIES;
> +			else
> +				next_state = SNK_WAIT_CAPABILITIES;
> +			tcpm_set_state(port, next_state, 0);
> +			break;
> +		case DR_SWAP_SEND:
> +			tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
> +			break;
> +		case PR_SWAP_SEND:
> +			tcpm_set_state(port, PR_SWAP_START, 0);
> +			break;
> +		case VCONN_SWAP_SEND:
> +			tcpm_set_state(port, VCONN_SWAP_START, 0);
> +			break;
> +		default:
> +			break;
> +		}
> +		break;
> +	case PD_CTRL_SOFT_RESET:
> +		tcpm_set_state(port, SOFT_RESET, 0);
> +		break;
> +	case PD_CTRL_DR_SWAP:
> +		if (port->typec_caps.type != TYPEC_PORT_DRP) {
> +			tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> +			break;
> +		}
> +		/*
> +		 * XXX
> +		 * 6.3.9: If an alternate mode is active, a request to swap
> +		 * alternate modes shall trigger a port reset.
> +		 */
> +		switch (port->state) {
> +		case SRC_READY:
> +		case SNK_READY:
> +			tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
> +			break;
> +		default:
> +			tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
> +			break;
> +		}
> +		break;
> +	case PD_CTRL_PR_SWAP:
> +		if (port->typec_caps.type != TYPEC_PORT_DRP) {
> +			tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> +			break;
> +		}
> +		switch (port->state) {
> +		case SRC_READY:
> +		case SNK_READY:
> +			tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
> +			break;
> +		default:
> +			tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
> +			break;
> +		}
> +		break;
> +	case PD_CTRL_VCONN_SWAP:
> +		switch (port->state) {
> +		case SRC_READY:
> +		case SNK_READY:
> +			tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
> +			break;
> +		default:
> +			tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
> +			break;
> +		}
> +		break;
> +	default:
> +		tcpm_log(port, "Unhandled ctrl message type %#x", type);
> +		break;
> +	}
> +}
> +
> +static void tcpm_pd_rx_handler(struct work_struct *work)
> +{
> +	struct pd_rx_event *event = container_of(work,
> +						 struct pd_rx_event, work);
> +	const struct pd_message *msg = &event->msg;
> +	unsigned int cnt = pd_header_cnt_le(msg->header);
> +	struct tcpm_port *port = event->port;
> +
> +	mutex_lock(&port->lock);
> +
> +	tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
> +		 port->attached);
> +
> +	if (port->attached) {
> +		/*
> +		 * If both ends believe to be DFP/host, we have a data role
> +		 * mismatch.
> +		 */
> +		if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
> +		    (port->data_role == TYPEC_HOST)) {
> +			tcpm_log(port,
> +				 "Data role mismatch, initiating error recovery");
> +			tcpm_set_state(port, ERROR_RECOVERY, 0);
> +		} else {
> +			if (cnt)
> +				tcpm_pd_data_request(port, msg);
> +			else
> +				tcpm_pd_ctrl_request(port, msg);
> +		}
> +	}
> +
> +	mutex_unlock(&port->lock);
> +	kfree(event);
> +}
> +
> +void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
> +{
> +	struct pd_rx_event *event;
> +
> +	event = kzalloc(sizeof(*event), GFP_ATOMIC);
> +	if (!event)
> +		return;
> +
> +	INIT_WORK(&event->work, tcpm_pd_rx_handler);
> +	event->port = port;
> +	memcpy(&event->msg, msg, sizeof(*msg));
> +	queue_work(port->wq, &event->work);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_pd_receive);
> +
> +static int tcpm_pd_send_control(struct tcpm_port *port,
> +				enum pd_ctrl_msg_type type)
> +{
> +	struct pd_message msg;
> +
> +	memset(&msg, 0, sizeof(msg));
> +	msg.header = PD_HEADER_LE(type, port->pwr_role,
> +				  port->data_role,
> +				  port->message_id, 0);
> +
> +	return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> +}
> +
> +/*
> + * Send queued message without affecting state.
> + * Return true if state machine should go back to sleep,
> + * false otherwise.
> + */
> +static bool tcpm_send_queued_message(struct tcpm_port *port)
> +{
> +	enum pd_msg_request queued_message;
> +
> +	do {
> +		queued_message = port->queued_message;
> +		port->queued_message = PD_MSG_NONE;
> +
> +		switch (queued_message) {
> +		case PD_MSG_CTRL_WAIT:
> +			tcpm_pd_send_control(port, PD_CTRL_WAIT);
> +			break;
> +		case PD_MSG_CTRL_REJECT:
> +			tcpm_pd_send_control(port, PD_CTRL_REJECT);
> +			break;
> +		case PD_MSG_DATA_SINK_CAP:
> +			tcpm_pd_send_sink_caps(port);
> +			break;
> +		case PD_MSG_DATA_SOURCE_CAP:
> +			tcpm_pd_send_source_caps(port);
> +			break;
> +		default:
> +			break;
> +		}
> +	} while (port->queued_message != PD_MSG_NONE);
> +
> +	if (port->delayed_state != INVALID_STATE) {
> +		if (time_is_after_jiffies(port->delayed_runtime)) {
> +			mod_delayed_work(port->wq, &port->state_machine,
> +					 port->delayed_runtime - jiffies);
> +			return true;
> +		}
> +		port->delayed_state = INVALID_STATE;
> +	}
> +	return false;
> +}
> +
> +static int tcpm_pd_check_request(struct tcpm_port *port)
> +{
> +	u32 pdo, rdo = port->sink_request;
> +	unsigned int max, op, pdo_max, index;
> +	enum pd_pdo_type type;
> +
> +	index = rdo_index(rdo);
> +	if (!index || index > port->nr_src_pdo)
> +		return -EINVAL;
> +
> +	pdo = port->src_pdo[index - 1];
> +	type = pdo_type(pdo);
> +	switch (type) {
> +	case PDO_TYPE_FIXED:
> +	case PDO_TYPE_VAR:
> +		max = rdo_max_current(rdo);
> +		op = rdo_op_current(rdo);
> +		pdo_max = pdo_max_current(pdo);
> +
> +		if (op > pdo_max)
> +			return -EINVAL;
> +		if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
> +			return -EINVAL;
> +
> +		if (type == PDO_TYPE_FIXED)
> +			tcpm_log(port,
> +				 "Requested %u mV, %u mA for %u / %u mA",
> +				 pdo_fixed_voltage(pdo), pdo_max, op, max);
> +		else
> +			tcpm_log(port,
> +				 "Requested %u -> %u mV, %u mA for %u / %u mA",
> +				 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
> +				 pdo_max, op, max);
> +		break;
> +	case PDO_TYPE_BATT:
> +		max = rdo_max_power(rdo);
> +		op = rdo_op_power(rdo);
> +		pdo_max = pdo_max_power(pdo);
> +
> +		if (op > pdo_max)
> +			return -EINVAL;
> +		if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
> +			return -EINVAL;
> +		tcpm_log(port,
> +			 "Requested %u -> %u mV, %u mW for %u / %u mW",
> +			 pdo_min_voltage(pdo), pdo_max_voltage(pdo),
> +			 pdo_max, op, max);
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	port->op_vsafe5v = index == 1;
> +
> +	return 0;
> +}
> +
> +static int tcpm_pd_select_pdo(struct tcpm_port *port)
> +{
> +	unsigned int i, max_mw = 0, max_mv = 0;
> +	int ret = -EINVAL;
> +
> +	/*
> +	 * Select the source PDO providing the most power while staying within
> +	 * the board's voltage limits. Prefer PDO providing exp
> +	 */
> +	for (i = 0; i < port->nr_source_caps; i++) {
> +		u32 pdo = port->source_caps[i];
> +		enum pd_pdo_type type = pdo_type(pdo);
> +		unsigned int mv, ma, mw;
> +
> +		if (type == PDO_TYPE_FIXED)
> +			mv = pdo_fixed_voltage(pdo);
> +		else
> +			mv = pdo_min_voltage(pdo);
> +
> +		if (type == PDO_TYPE_BATT) {
> +			mw = pdo_max_power(pdo);
> +		} else {
> +			ma = min(pdo_max_current(pdo),
> +				 port->max_snk_ma);
> +			mw = ma * mv / 1000;
> +		}
> +
> +		/* Perfer higher voltages if available */
> +		if ((mw > max_mw || (mw == max_mw && mv > max_mv)) &&
> +		    mv <= port->max_snk_mv) {
> +			ret = i;
> +			max_mw = mw;
> +			max_mv = mv;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
> +{
> +	unsigned int mv, ma, mw, flags;
> +	unsigned int max_ma, max_mw;
> +	enum pd_pdo_type type;
> +	int index;
> +	u32 pdo;
> +
> +	index = tcpm_pd_select_pdo(port);
> +	if (index < 0)
> +		return -EINVAL;
> +	pdo = port->source_caps[index];
> +	type = pdo_type(pdo);
> +
> +	if (type == PDO_TYPE_FIXED)
> +		mv = pdo_fixed_voltage(pdo);
> +	else
> +		mv = pdo_min_voltage(pdo);
> +
> +	/* Select maximum available current within the board's power limit */
> +	if (type == PDO_TYPE_BATT) {
> +		mw = pdo_max_power(pdo);
> +		ma = 1000 * min(mw, port->max_snk_mw) / mv;
> +	} else {
> +		ma = min(pdo_max_current(pdo),
> +			 1000 * port->max_snk_mw / mv);
> +	}
> +	ma = min(ma, port->max_snk_ma);
> +
> +	/* XXX: Any other flags need to be set? */
> +	flags = 0;
> +
> +	/* Set mismatch bit if offered power is less than operating power */
> +	mw = ma * mv / 1000;
> +	max_ma = ma;
> +	max_mw = mw;
> +	if (mw < port->operating_snk_mw) {
> +		flags |= RDO_CAP_MISMATCH;
> +		max_mw = port->operating_snk_mw;
> +		max_ma = max_mw * 1000 / mv;
> +	}
> +
> +	tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
> +		 port->cc_req, port->cc1, port->cc2, port->vbus_source,
> +		 port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
> +		 port->polarity);
> +
> +	if (type == PDO_TYPE_BATT) {
> +		*rdo = RDO_BATT(index + 1, mw, max_mw, flags);
> +
> +		tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
> +			 index, mv, mw,
> +			 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
> +	} else {
> +		*rdo = RDO_FIXED(index + 1, ma, max_ma, flags);
> +
> +		tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
> +			 index, mv, ma,
> +			 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
> +	}
> +
> +	port->current_limit = ma;
> +	port->supply_voltage = mv;
> +
> +	return 0;
> +}
> +
> +static int tcpm_pd_send_request(struct tcpm_port *port)
> +{
> +	struct pd_message msg;
> +	int ret;
> +	u32 rdo;
> +
> +	ret = tcpm_pd_build_request(port, &rdo);
> +	if (ret < 0)
> +		return ret;
> +
> +	memset(&msg, 0, sizeof(msg));
> +	msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
> +				  port->pwr_role,
> +				  port->data_role,
> +				  port->message_id, 1);
> +	msg.payload[0] = cpu_to_le32(rdo);
> +
> +	return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> +}
> +
> +static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
> +{
> +	int ret;
> +
> +	if (enable && port->vbus_charge)
> +		return -EINVAL;
> +
> +	tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
> +
> +	ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
> +	if (ret < 0)
> +		return ret;
> +
> +	port->vbus_source = enable;
> +	return 0;
> +}
> +
> +static int tcpm_set_charge(struct tcpm_port *port, bool charge)
> +{
> +	int ret;
> +
> +	if (charge && port->vbus_source)
> +		return -EINVAL;
> +
> +	if (charge != port->vbus_charge) {
> +		tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
> +		ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
> +					   charge);
> +		if (ret < 0)
> +			return ret;
> +	}
> +	port->vbus_charge = charge;
> +	return 0;
> +}
> +
> +static bool tcpm_start_drp_toggling(struct tcpm_port *port)
> +{
> +	int ret;
> +
> +	if (port->tcpc->start_drp_toggling &&
> +	    port->typec_caps.type == TYPEC_PORT_DRP) {
> +		tcpm_log_force(port, "Start DRP toggling");
> +		ret = port->tcpc->start_drp_toggling(port->tcpc,
> +						     tcpm_rp_cc(port));
> +		if (!ret)
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
> +static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
> +{
> +	tcpm_log(port, "cc:=%d", cc);
> +	port->cc_req = cc;
> +	port->tcpc->set_cc(port->tcpc, cc);
> +}
> +
> +static int tcpm_init_vbus(struct tcpm_port *port)
> +{
> +	int ret;
> +
> +	ret = port->tcpc->set_vbus(port->tcpc, false, false);
> +	port->vbus_source = false;
> +	port->vbus_charge = false;
> +	return ret;
> +}
> +
> +static int tcpm_init_vconn(struct tcpm_port *port)
> +{
> +	int ret;
> +
> +	ret = port->tcpc->set_vconn(port->tcpc, false);
> +	port->vconn_role = TYPEC_SINK;
> +	return ret;
> +}
> +
> +static void tcpm_typec_connect(struct tcpm_port *port)
> +{
> +	if (!port->connected) {
> +		/* Make sure we don't report stale identity information */
> +		memset(&port->partner_ident, 0, sizeof(port->partner_ident));
> +		port->partner_desc.usb_pd = port->pd_capable;
> +		if (tcpm_port_is_debug(port))
> +			port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
> +		else if (tcpm_port_is_audio(port))
> +			port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
> +		else
> +			port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
> +		port->partner = typec_register_partner(port->typec_port,
> +						       &port->partner_desc);
> +		port->connected = true;
> +	}
> +}
> +
> +static int tcpm_src_attach(struct tcpm_port *port)
> +{
> +	enum typec_cc_polarity polarity =
> +				port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
> +							 : TYPEC_POLARITY_CC1;
> +	int ret;
> +
> +	if (port->attached)
> +		return 0;
> +
> +	ret = tcpm_set_polarity(port, polarity);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = port->tcpc->set_pd_rx(port->tcpc, true);
> +	if (ret < 0)
> +		goto out_disable_mux;
> +
> +	/*
> +	 * USB Type-C specification, version 1.2,
> +	 * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
> +	 * Enable VCONN only if the non-RD port is set to RA.
> +	 */
> +	if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
> +	    (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
> +		ret = tcpm_set_vconn(port, true);
> +		if (ret < 0)
> +			goto out_disable_pd;
> +	}
> +
> +	ret = tcpm_set_vbus(port, true);
> +	if (ret < 0)
> +		goto out_disable_vconn;
> +
> +	port->pd_capable = false;
> +
> +	port->partner = NULL;
> +
> +	port->attached = true;
> +	port->send_discover = true;
> +
> +	return 0;
> +
> +out_disable_vconn:
> +	tcpm_set_vconn(port, false);
> +out_disable_pd:
> +	port->tcpc->set_pd_rx(port->tcpc, false);
> +out_disable_mux:
> +	tcpm_mux_set(port, TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT);
> +	return ret;
> +}
> +
> +static void tcpm_typec_disconnect(struct tcpm_port *port)
> +{
> +	if (port->connected) {
> +		typec_unregister_partner(port->partner);
> +		port->partner = NULL;
> +		port->connected = false;
> +	}
> +}
> +
> +static void tcpm_unregister_altmodes(struct tcpm_port *port)
> +{
> +	struct pd_mode_data *modep = &port->mode_data;
> +	int i;
> +
> +	for (i = 0; i < modep->altmodes; i++) {
> +		typec_unregister_altmode(port->partner_altmode[i]);
> +		port->partner_altmode[i] = NULL;
> +	}
> +
> +	memset(modep, 0, sizeof(*modep));
> +}
> +
> +static void tcpm_reset_port(struct tcpm_port *port)
> +{
> +	tcpm_unregister_altmodes(port);
> +	tcpm_typec_disconnect(port);
> +	port->attached = false;
> +	port->pd_capable = false;
> +
> +	port->tcpc->set_pd_rx(port->tcpc, false);
> +	tcpm_init_vbus(port);	/* also disables charging */
> +	tcpm_init_vconn(port);
> +	tcpm_set_current_limit(port, 0, 0);
> +	tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
> +	tcpm_set_attached_state(port, false);
> +	port->try_src_count = 0;
> +	port->try_snk_count = 0;
> +}
> +
> +static void tcpm_detach(struct tcpm_port *port)
> +{
> +	if (!port->attached)
> +		return;
> +
> +	if (tcpm_port_is_disconnected(port))
> +		port->hard_reset_count = 0;
> +
> +	tcpm_reset_port(port);
> +}
> +
> +static void tcpm_src_detach(struct tcpm_port *port)
> +{
> +	tcpm_detach(port);
> +}
> +
> +static int tcpm_snk_attach(struct tcpm_port *port)
> +{
> +	int ret;
> +
> +	if (port->attached)
> +		return 0;
> +
> +	ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
> +				TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
> +	if (ret < 0)
> +		return ret;
> +
> +	port->pd_capable = false;
> +
> +	port->partner = NULL;
> +
> +	port->attached = true;
> +	port->send_discover = true;
> +
> +	return 0;
> +}
> +
> +static void tcpm_snk_detach(struct tcpm_port *port)
> +{
> +	tcpm_detach(port);
> +
> +	/* XXX: (Dis)connect SuperSpeed mux? */
> +}
> +
> +static int tcpm_acc_attach(struct tcpm_port *port)
> +{
> +	int ret;
> +
> +	if (port->attached)
> +		return 0;
> +
> +	ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
> +	if (ret < 0)
> +		return ret;
> +
> +	port->partner = NULL;
> +
> +	tcpm_typec_connect(port);
> +
> +	port->attached = true;
> +
> +	return 0;
> +}
> +
> +static void tcpm_acc_detach(struct tcpm_port *port)
> +{
> +	tcpm_detach(port);
> +}
> +
> +static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
> +{
> +	if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
> +		return HARD_RESET_SEND;
> +	if (port->pd_capable)
> +		return ERROR_RECOVERY;
> +	if (port->pwr_role == TYPEC_SOURCE)
> +		return SRC_UNATTACHED;
> +	if (port->state == SNK_WAIT_CAPABILITIES)
> +		return SNK_READY;
> +	return SNK_UNATTACHED;
> +}
> +
> +static inline enum tcpm_state ready_state(struct tcpm_port *port)
> +{
> +	if (port->pwr_role == TYPEC_SOURCE)
> +		return SRC_READY;
> +	else
> +		return SNK_READY;
> +}
> +
> +static inline enum tcpm_state unattached_state(struct tcpm_port *port)
> +{
> +	if (port->pwr_role == TYPEC_SOURCE)
> +		return SRC_UNATTACHED;
> +	else
> +		return SNK_UNATTACHED;
> +}
> +
> +static void tcpm_check_send_discover(struct tcpm_port *port)
> +{
> +	if (port->data_role == TYPEC_HOST && port->send_discover &&
> +	    port->pd_capable) {
> +		tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
> +		port->send_discover = false;
> +	}
> +}
> +
> +static void tcpm_swap_complete(struct tcpm_port *port, int result)
> +{
> +	if (port->swap_pending) {
> +		port->swap_status = result;
> +		port->swap_pending = false;
> +		complete(&port->swap_complete);
> +	}
> +}
> +
> +static void run_state_machine(struct tcpm_port *port)
> +{
> +	int ret;
> +
> +	port->enter_state = port->state;
> +	switch (port->state) {
> +	case DRP_TOGGLING:
> +		break;
> +	/* SRC states */
> +	case SRC_UNATTACHED:
> +		tcpm_swap_complete(port, -ENOTCONN);
> +		tcpm_src_detach(port);
> +		if (tcpm_start_drp_toggling(port)) {
> +			tcpm_set_state(port, DRP_TOGGLING, 0);
> +			break;
> +		}
> +		tcpm_set_cc(port, tcpm_rp_cc(port));
> +		if (port->typec_caps.type == TYPEC_PORT_DRP)
> +			tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
> +		break;
> +	case SRC_ATTACH_WAIT:
> +		if (tcpm_port_is_debug(port))
> +			tcpm_set_state(port, DEBUG_ACC_ATTACHED,
> +				       PD_T_CC_DEBOUNCE);
> +		else if (tcpm_port_is_audio(port))
> +			tcpm_set_state(port, AUDIO_ACC_ATTACHED,
> +				       PD_T_CC_DEBOUNCE);
> +		else if (tcpm_port_is_source(port))
> +			tcpm_set_state(port,
> +				       tcpm_try_snk(port) ? SNK_TRY
> +							  : SRC_ATTACHED,
> +				       PD_T_CC_DEBOUNCE);
> +		break;
> +
> +	case SNK_TRY:
> +		port->try_snk_count++;
> +		/*
> +		 * Requirements:
> +		 * - Do not drive vconn or vbus
> +		 * - Terminate CC pins (both) to Rd
> +		 * Action:
> +		 * - Wait for tDRPTry (PD_T_DRP_TRY).
> +		 *   Until then, ignore any state changes.
> +		 */
> +		tcpm_set_cc(port, TYPEC_CC_RD);
> +		tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
> +		break;
> +	case SNK_TRY_WAIT:
> +		if (port->vbus_present && tcpm_port_is_sink(port)) {
> +			tcpm_set_state(port, SNK_ATTACHED, 0);
> +			break;
> +		}
> +		if (!tcpm_port_is_sink(port)) {
> +			tcpm_set_state(port, SRC_TRYWAIT,
> +				       PD_T_PD_DEBOUNCE);
> +			break;
> +		}
> +		/* No vbus, cc state is sink or open */
> +		tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED, PD_T_DRP_TRYWAIT);
> +		break;
> +	case SRC_TRYWAIT:
> +		tcpm_set_cc(port, tcpm_rp_cc(port));
> +		if (!port->vbus_present && tcpm_port_is_source(port))
> +			tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
> +		else
> +			tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
> +				       PD_T_DRP_TRY);
> +		break;
> +	case SRC_TRYWAIT_UNATTACHED:
> +		tcpm_set_state(port, SNK_UNATTACHED, 0);
> +		break;
> +
> +	case SRC_ATTACHED:
> +		ret = tcpm_src_attach(port);
> +		tcpm_set_state(port, SRC_UNATTACHED,
> +			       ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
> +		break;
> +	case SRC_STARTUP:
> +		typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_USB);
> +		port->pwr_opmode = TYPEC_PWR_MODE_USB;
> +		port->caps_count = 0;
> +		port->message_id = 0;
> +		port->explicit_contract = false;
> +		tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
> +		break;
> +	case SRC_SEND_CAPABILITIES:
> +		port->caps_count++;
> +		if (port->caps_count > PD_N_CAPS_COUNT) {
> +			tcpm_set_state(port, SRC_READY, 0);
> +			break;
> +		}
> +		ret = tcpm_pd_send_source_caps(port);
> +		if (ret < 0) {
> +			tcpm_set_state(port, SRC_SEND_CAPABILITIES,
> +				       PD_T_SEND_SOURCE_CAP);
> +		} else {
> +			/*
> +			 * Per standard, we should clear the reset counter here.
> +			 * However, that can result in state machine hang-ups.
> +			 * Reset it only in READY state to improve stability.
> +			 */
> +			/* port->hard_reset_count = 0; */
> +			port->caps_count = 0;
> +			port->pd_capable = true;
> +			tcpm_set_state_cond(port, hard_reset_state(port),
> +					    PD_T_SEND_SOURCE_CAP);
> +		}
> +		break;
> +	case SRC_NEGOTIATE_CAPABILITIES:
> +		ret = tcpm_pd_check_request(port);
> +		if (ret < 0) {
> +			tcpm_pd_send_control(port, PD_CTRL_REJECT);
> +			if (!port->explicit_contract) {
> +				tcpm_set_state(port,
> +					       SRC_WAIT_NEW_CAPABILITIES, 0);
> +			} else {
> +				tcpm_set_state(port, SRC_READY, 0);
> +			}
> +		} else {
> +			tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> +			tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
> +				       PD_T_SRC_TRANSITION);
> +		}
> +		break;
> +	case SRC_TRANSITION_SUPPLY:
> +		/* XXX: regulator_set_voltage(vbus, ...) */
> +		tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
> +		port->explicit_contract = true;
> +		typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
> +		port->pwr_opmode = TYPEC_PWR_MODE_PD;
> +		tcpm_set_state_cond(port, SRC_READY, 0);
> +		break;
> +	case SRC_READY:
> +#if 1
> +		port->hard_reset_count = 0;
> +#endif
> +		port->try_src_count = 0;
> +
> +		tcpm_typec_connect(port);
> +
> +		tcpm_check_send_discover(port);
> +		/*
> +		 * 6.3.5
> +		 * Sending ping messages is not necessary if
> +		 * - the source operates at vSafe5V
> +		 * or
> +		 * - The system is not operating in PD mode
> +		 * or
> +		 * - Both partners are connected using a Type-C connector
> +		 *   XXX How do we know that ?
> +		 */
> +		if (port->pwr_opmode == TYPEC_PWR_MODE_PD &&
> +		    !port->op_vsafe5v) {
> +			tcpm_pd_send_control(port, PD_CTRL_PING);
> +			tcpm_set_state_cond(port, SRC_READY,
> +					    PD_T_SOURCE_ACTIVITY);
> +		}
> +		break;
> +	case SRC_WAIT_NEW_CAPABILITIES:
> +		/* Nothing to do... */
> +		break;
> +
> +	/* SNK states */
> +	case SNK_UNATTACHED:
> +		tcpm_swap_complete(port, -ENOTCONN);
> +		tcpm_snk_detach(port);
> +		if (tcpm_start_drp_toggling(port)) {
> +			tcpm_set_state(port, DRP_TOGGLING, 0);
> +			break;
> +		}
> +		tcpm_set_cc(port, TYPEC_CC_RD);
> +		if (port->typec_caps.type == TYPEC_PORT_DRP)
> +			tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
> +		break;
> +	case SNK_ATTACH_WAIT:
> +		if ((port->cc1 == TYPEC_CC_OPEN &&
> +		     port->cc2 != TYPEC_CC_OPEN) ||
> +		    (port->cc1 != TYPEC_CC_OPEN &&
> +		     port->cc2 == TYPEC_CC_OPEN))
> +			tcpm_set_state(port, SNK_DEBOUNCED,
> +				       PD_T_CC_DEBOUNCE);
> +		else if (tcpm_port_is_disconnected(port))
> +			tcpm_set_state(port, SNK_UNATTACHED,
> +				       PD_T_PD_DEBOUNCE);
> +		break;
> +	case SNK_DEBOUNCED:
> +		if (tcpm_port_is_disconnected(port))
> +			tcpm_set_state(port, SNK_UNATTACHED,
> +				       PD_T_PD_DEBOUNCE);
> +		else if (port->vbus_present)
> +			tcpm_set_state(port,
> +				       tcpm_try_src(port) ? SRC_TRY
> +							  : SNK_ATTACHED,
> +				       0);
> +		else
> +			/* Wait for VBUS, but not forever */
> +			tcpm_set_state(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
> +		break;
> +
> +	case SRC_TRY:
> +		port->try_src_count++;
> +		tcpm_set_cc(port, tcpm_rp_cc(port));
> +		tcpm_set_state(port, SNK_TRYWAIT, PD_T_DRP_TRY);
> +		break;
> +	case SRC_TRY_DEBOUNCE:
> +		tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
> +		break;
> +	case SNK_TRYWAIT:
> +		tcpm_set_cc(port, TYPEC_CC_RD);
> +		tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, PD_T_CC_DEBOUNCE);
> +		break;
> +	case SNK_TRYWAIT_DEBOUNCE:
> +		if (port->vbus_present) {
> +			tcpm_set_state(port, SNK_ATTACHED, 0);
> +			break;
> +		}
> +		if (tcpm_port_is_disconnected(port)) {
> +			tcpm_set_state(port, SNK_UNATTACHED,
> +				       PD_T_PD_DEBOUNCE);
> +			break;
> +		}
> +		if (tcpm_port_is_source(port))
> +			tcpm_set_state(port, SRC_ATTACHED, 0);
> +		/* XXX Are we supposed to stay in this state ? */
> +		break;
> +	case SNK_TRYWAIT_VBUS:
> +		tcpm_set_state(port, SNK_ATTACHED, PD_T_CC_DEBOUNCE);
> +		break;
> +
> +	case SNK_ATTACHED:
> +		ret = tcpm_snk_attach(port);
> +		if (ret < 0)
> +			tcpm_set_state(port, SNK_UNATTACHED, 0);
> +		else
> +			tcpm_set_state(port, SNK_STARTUP, 0);
> +		break;
> +	case SNK_STARTUP:
> +		/* XXX: callback into infrastructure */
> +		typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_USB);
> +		port->pwr_opmode = TYPEC_PWR_MODE_USB;
> +		port->message_id = 0;
> +		port->explicit_contract = false;
> +		tcpm_set_state(port, SNK_DISCOVERY, 0);
> +		break;
> +	case SNK_DISCOVERY:
> +		if (port->vbus_present) {
> +			tcpm_set_current_limit(port,
> +					       tcpm_get_current_limit(port),
> +					       5000);
> +			tcpm_set_charge(port, true);
> +			tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
> +			break;
> +		}
> +		/*
> +		 * For DRP, timeouts differ. Also, handling is supposed to be
> +		 * different and much more complex (dead battery detection;
> +		 * see USB power delivery specification, section 8.3.3.6.1.5.1).
> +		 */
> +		tcpm_set_state(port, hard_reset_state(port),
> +			       port->typec_caps.type == TYPEC_PORT_DRP ?
> +					PD_T_DB_DETECT : PD_T_NO_RESPONSE);
> +		break;
> +	case SNK_DISCOVERY_DEBOUNCE:
> +		tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
> +			       PD_T_CC_DEBOUNCE);
> +		break;
> +	case SNK_DISCOVERY_DEBOUNCE_DONE:
> +		if (!tcpm_port_is_disconnected(port) &&
> +		    tcpm_port_is_sink(port) &&
> +		    time_is_after_jiffies(port->delayed_runtime)) {
> +			tcpm_set_state(port, SNK_DISCOVERY,
> +				       port->delayed_runtime - jiffies);
> +			break;
> +		}
> +		tcpm_set_state(port, unattached_state(port), 0);
> +		break;
> +	case SNK_WAIT_CAPABILITIES:
> +		ret = port->tcpc->set_pd_rx(port->tcpc, true);
> +		if (ret < 0) {
> +			tcpm_set_state(port, SNK_READY, 0);
> +			break;
> +		}
> +		/*
> +		 * If VBUS has never been low, and we time out waiting
> +		 * for source cap, try a soft reset first, in case we
> +		 * were already in a stable contract before this boot.
> +		 * Do this only once.
> +		 */
> +		if (port->vbus_never_low) {
> +			port->vbus_never_low = false;
> +			tcpm_set_state(port, SOFT_RESET_SEND,
> +				       PD_T_SINK_WAIT_CAP);
> +		} else {
> +			tcpm_set_state(port, hard_reset_state(port),
> +				       PD_T_SINK_WAIT_CAP);
> +		}
> +		break;
> +	case SNK_NEGOTIATE_CAPABILITIES:
> +		port->pd_capable = true;
> +		port->hard_reset_count = 0;
> +		ret = tcpm_pd_send_request(port);
> +		if (ret < 0) {
> +			/* Let the Source send capabilities again. */
> +			tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
> +		} else {
> +			tcpm_set_state_cond(port, hard_reset_state(port),
> +					    PD_T_SENDER_RESPONSE);
> +		}
> +		break;
> +	case SNK_TRANSITION_SINK:
> +	case SNK_TRANSITION_SINK_VBUS:
> +		tcpm_set_state(port, hard_reset_state(port),
> +			       PD_T_PS_TRANSITION);
> +		break;
> +	case SNK_READY:
> +		port->try_snk_count = 0;
> +		port->explicit_contract = true;
> +		typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
> +		port->pwr_opmode = TYPEC_PWR_MODE_PD;
> +
> +		tcpm_typec_connect(port);
> +
> +		tcpm_check_send_discover(port);
> +		break;
> +
> +	/* Accessory states */
> +	case ACC_UNATTACHED:
> +		tcpm_acc_detach(port);
> +		tcpm_set_state(port, SRC_UNATTACHED, 0);
> +		break;
> +	case DEBUG_ACC_ATTACHED:
> +	case AUDIO_ACC_ATTACHED:
> +		ret = tcpm_acc_attach(port);
> +		if (ret < 0)
> +			tcpm_set_state(port, ACC_UNATTACHED, 0);
> +		break;
> +	case AUDIO_ACC_DEBOUNCE:
> +		tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
> +		break;
> +
> +	/* Hard_Reset states */
> +	case HARD_RESET_SEND:
> +		tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
> +		tcpm_set_state(port, HARD_RESET_START, 0);
> +		break;
> +	case HARD_RESET_START:
> +		port->hard_reset_count++;
> +		port->tcpc->set_pd_rx(port->tcpc, false);
> +		tcpm_unregister_altmodes(port);
> +		port->send_discover = true;
> +		if (port->pwr_role == TYPEC_SOURCE)
> +			tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
> +				       PD_T_PS_HARD_RESET);
> +		else
> +			tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
> +		break;
> +	case SRC_HARD_RESET_VBUS_OFF:
> +		tcpm_set_vconn(port, true);
> +		tcpm_set_vbus(port, false);
> +		tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
> +		tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
> +		break;
> +	case SRC_HARD_RESET_VBUS_ON:
> +		tcpm_set_vbus(port, true);
> +		port->tcpc->set_pd_rx(port->tcpc, true);
> +		tcpm_set_attached_state(port, true);
> +		tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
> +		break;
> +	case SNK_HARD_RESET_SINK_OFF:
> +		tcpm_set_vconn(port, false);
> +		tcpm_set_charge(port, false);
> +		tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
> +		/*
> +		 * VBUS may or may not toggle, depending on the adapter.
> +		 * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
> +		 * directly after timeout.
> +		 */
> +		tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
> +		break;
> +	case SNK_HARD_RESET_WAIT_VBUS:
> +		/* Assume we're disconnected if VBUS doesn't come back. */
> +		tcpm_set_state(port, SNK_UNATTACHED,
> +			       PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
> +		break;
> +	case SNK_HARD_RESET_SINK_ON:
> +		/* Note: There is no guarantee that VBUS is on in this state */
> +		/*
> +		 * XXX:
> +		 * The specification suggests that dual mode ports in sink
> +		 * mode should transition to state PE_SRC_Transition_to_default.
> +		 * See USB power delivery specification chapter 8.3.3.6.1.3.
> +		 * This would mean to to
> +		 * - turn off VCONN, reset power supply
> +		 * - request hardware reset
> +		 * - turn on VCONN
> +		 * - Transition to state PE_Src_Startup
> +		 * SNK only ports shall transition to state Snk_Startup
> +		 * (see chapter 8.3.3.3.8).
> +		 * Similar, dual-mode ports in source mode should transition
> +		 * to PE_SNK_Transition_to_default.
> +		 */
> +		tcpm_set_attached_state(port, true);
> +		tcpm_set_state(port, SNK_STARTUP, 0);
> +		break;
> +
> +	/* Soft_Reset states */
> +	case SOFT_RESET:
> +		port->message_id = 0;
> +		tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> +		if (port->pwr_role == TYPEC_SOURCE)
> +			tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
> +		else
> +			tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
> +		break;
> +	case SOFT_RESET_SEND:
> +		port->message_id = 0;
> +		if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
> +			tcpm_set_state_cond(port, hard_reset_state(port), 0);
> +		else
> +			tcpm_set_state_cond(port, hard_reset_state(port),
> +					    PD_T_SENDER_RESPONSE);
> +		break;
> +
> +	/* DR_Swap states */
> +	case DR_SWAP_SEND:
> +		tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
> +		tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
> +				    PD_T_SENDER_RESPONSE);
> +		break;
> +	case DR_SWAP_ACCEPT:
> +		tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> +		tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
> +		break;
> +	case DR_SWAP_SEND_TIMEOUT:
> +		tcpm_swap_complete(port, -ETIMEDOUT);
> +		tcpm_set_state(port, ready_state(port), 0);
> +		break;
> +	case DR_SWAP_CHANGE_DR:
> +		if (port->data_role == TYPEC_HOST) {
> +			tcpm_unregister_altmodes(port);
> +			tcpm_set_roles(port, true, port->pwr_role,
> +				       TYPEC_DEVICE);
> +		} else {
> +			tcpm_set_roles(port, true, port->pwr_role,
> +				       TYPEC_HOST);
> +			port->send_discover = true;
> +		}
> +		tcpm_swap_complete(port, 0);
> +		tcpm_set_state(port, ready_state(port), 0);
> +		break;
> +
> +	/* PR_Swap states */
> +	case PR_SWAP_ACCEPT:
> +		tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> +		tcpm_set_state(port, PR_SWAP_START, 0);
> +		break;
> +	case PR_SWAP_SEND:
> +		tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
> +		tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
> +				    PD_T_SENDER_RESPONSE);
> +		break;
> +	case PR_SWAP_SEND_TIMEOUT:
> +		tcpm_swap_complete(port, -ETIMEDOUT);
> +		tcpm_set_state(port, ready_state(port), 0);
> +		break;
> +	case PR_SWAP_START:
> +		if (port->pwr_role == TYPEC_SOURCE)
> +			tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
> +				       PD_T_SRC_TRANSITION);
> +		else
> +			tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
> +		break;
> +	case PR_SWAP_SRC_SNK_TRANSITION_OFF:
> +		tcpm_set_vbus(port, false);
> +		port->explicit_contract = false;
> +		tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
> +			       PD_T_PS_SOURCE_OFF);
> +		break;
> +	case PR_SWAP_SRC_SNK_SOURCE_OFF:
> +		tcpm_set_cc(port, TYPEC_CC_RD);
> +		if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
> +			tcpm_set_state(port, ERROR_RECOVERY, 0);
> +			break;
> +		}
> +		tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
> +		break;
> +	case PR_SWAP_SRC_SNK_SINK_ON:
> +		tcpm_set_pwr_role(port, TYPEC_SINK);
> +		tcpm_swap_complete(port, 0);
> +		tcpm_set_state(port, SNK_STARTUP, 0);
> +		break;
> +	case PR_SWAP_SNK_SRC_SINK_OFF:
> +		tcpm_set_charge(port, false);
> +		tcpm_set_state(port, hard_reset_state(port),
> +			       PD_T_PS_SOURCE_OFF);
> +		break;
> +	case PR_SWAP_SNK_SRC_SOURCE_ON:
> +		tcpm_set_cc(port, tcpm_rp_cc(port));
> +		tcpm_set_vbus(port, true);
> +		tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
> +		tcpm_set_pwr_role(port, TYPEC_SOURCE);
> +		tcpm_swap_complete(port, 0);
> +		tcpm_set_state(port, SRC_STARTUP, 0);
> +		break;
> +
> +	case VCONN_SWAP_ACCEPT:
> +		tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> +		tcpm_set_state(port, VCONN_SWAP_START, 0);
> +		break;
> +	case VCONN_SWAP_SEND:
> +		tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
> +		tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
> +			       PD_T_SENDER_RESPONSE);
> +		break;
> +	case VCONN_SWAP_SEND_TIMEOUT:
> +		tcpm_swap_complete(port, -ETIMEDOUT);
> +		tcpm_set_state(port, ready_state(port), 0);
> +		break;
> +	case VCONN_SWAP_START:
> +		if (port->vconn_role == TYPEC_SOURCE)
> +			tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
> +		else
> +			tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
> +		break;
> +	case VCONN_SWAP_WAIT_FOR_VCONN:
> +		tcpm_set_state(port, hard_reset_state(port),
> +			       PD_T_VCONN_SOURCE_ON);
> +		break;
> +	case VCONN_SWAP_TURN_ON_VCONN:
> +		tcpm_set_vconn(port, true);
> +		tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
> +		tcpm_swap_complete(port, 0);
> +		tcpm_set_state(port, ready_state(port), 0);
> +		break;
> +	case VCONN_SWAP_TURN_OFF_VCONN:
> +		tcpm_set_vconn(port, false);
> +		tcpm_swap_complete(port, 0);
> +		tcpm_set_state(port, ready_state(port), 0);
> +		break;
> +
> +	case DR_SWAP_CANCEL:
> +	case PR_SWAP_CANCEL:
> +	case VCONN_SWAP_CANCEL:
> +		tcpm_swap_complete(port, port->swap_status);
> +		if (port->pwr_role == TYPEC_SOURCE)
> +			tcpm_set_state(port, SRC_READY, 0);
> +		else
> +			tcpm_set_state(port, SNK_READY, 0);
> +		break;
> +
> +	case BIST_RX:
> +		switch (BDO_MODE_MASK(port->bist_request)) {
> +		case BDO_MODE_CARRIER2:
> +			tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
> +			break;
> +		default:
> +			break;
> +		}
> +		/* Always switch to unattached state */
> +		tcpm_set_state(port, unattached_state(port), 0);
> +		break;
> +	case ERROR_RECOVERY:
> +		tcpm_swap_complete(port, -EPROTO);
> +		tcpm_reset_port(port);
> +
> +		tcpm_set_cc(port, TYPEC_CC_OPEN);
> +		tcpm_set_state(port, ERROR_RECOVERY_WAIT_OFF,
> +			       PD_T_ERROR_RECOVERY);
> +		break;
> +	case ERROR_RECOVERY_WAIT_OFF:
> +		tcpm_set_state(port,
> +			       tcpm_default_state(port),
> +			       port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
> +		break;
> +	default:
> +		WARN(1, "Unexpected port state %d\n", port->state);
> +		break;
> +	}
> +}
> +
> +static void tcpm_state_machine_work(struct work_struct *work)
> +{
> +	struct tcpm_port *port = container_of(work, struct tcpm_port,
> +					      state_machine.work);
> +	enum tcpm_state prev_state;
> +
> +	mutex_lock(&port->lock);
> +	port->state_machine_running = true;
> +
> +	if (port->queued_message && tcpm_send_queued_message(port))
> +		goto done;
> +
> +	/* If we were queued due to a delayed state change, update it now */
> +	if (port->delayed_state) {
> +		tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
> +			 tcpm_states[port->state],
> +			 tcpm_states[port->delayed_state], port->delay_ms);
> +		port->prev_state = port->state;
> +		port->state = port->delayed_state;
> +		port->delayed_state = INVALID_STATE;
> +	}
> +
> +	/*
> +	 * Continue running as long as we have (non-delayed) state changes
> +	 * to make.
> +	 */
> +	do {
> +		prev_state = port->state;
> +		run_state_machine(port);
> +		if (port->queued_message)
> +			tcpm_send_queued_message(port);
> +	} while (port->state != prev_state && !port->delayed_state);
> +
> +done:
> +	port->state_machine_running = false;
> +	mutex_unlock(&port->lock);
> +}
> +
> +static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
> +			    enum typec_cc_status cc2)
> +{
> +	enum typec_cc_status old_cc1, old_cc2;
> +	enum tcpm_state new_state;
> +
> +	old_cc1 = port->cc1;
> +	old_cc2 = port->cc2;
> +	port->cc1 = cc1;
> +	port->cc2 = cc2;
> +
> +	tcpm_log_force(port,
> +		       "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
> +		       old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
> +		       port->polarity,
> +		       tcpm_port_is_disconnected(port) ? "disconnected"
> +						       : "connected");
> +
> +	switch (port->state) {
> +	case DRP_TOGGLING:
> +		if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
> +		    tcpm_port_is_source(port))
> +			tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
> +		else if (tcpm_port_is_sink(port))
> +			tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
> +		break;
> +	case SRC_UNATTACHED:
> +	case ACC_UNATTACHED:
> +		if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
> +		    tcpm_port_is_source(port))
> +			tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
> +		break;
> +	case SRC_ATTACH_WAIT:
> +		if (tcpm_port_is_disconnected(port) ||
> +		    tcpm_port_is_audio_detached(port))
> +			tcpm_set_state(port, SRC_UNATTACHED, 0);
> +		else if (cc1 != old_cc1 || cc2 != old_cc2)
> +			tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
> +		break;
> +	case SRC_ATTACHED:
> +		if (tcpm_port_is_disconnected(port))
> +			tcpm_set_state(port, SRC_UNATTACHED, 0);
> +		break;
> +
> +	case SNK_UNATTACHED:
> +		if (tcpm_port_is_sink(port))
> +			tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
> +		break;
> +	case SNK_ATTACH_WAIT:
> +		if ((port->cc1 == TYPEC_CC_OPEN &&
> +		     port->cc2 != TYPEC_CC_OPEN) ||
> +		    (port->cc1 != TYPEC_CC_OPEN &&
> +		     port->cc2 == TYPEC_CC_OPEN))
> +			new_state = SNK_DEBOUNCED;
> +		else if (tcpm_port_is_disconnected(port))
> +			new_state = SNK_UNATTACHED;
> +		else
> +			break;
> +		if (new_state != port->delayed_state)
> +			tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
> +		break;
> +	case SNK_DEBOUNCED:
> +		if (tcpm_port_is_disconnected(port))
> +			new_state = SNK_UNATTACHED;
> +		else if (port->vbus_present)
> +			new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
> +		else
> +			new_state = SNK_UNATTACHED;
> +		if (new_state != port->delayed_state)
> +			tcpm_set_state(port, SNK_DEBOUNCED, 0);
> +		break;
> +	case SNK_READY:
> +		if (tcpm_port_is_disconnected(port))
> +			tcpm_set_state(port, unattached_state(port), 0);
> +		else if (!port->pd_capable &&
> +			 (cc1 != old_cc1 || cc2 != old_cc2))
> +			tcpm_set_current_limit(port,
> +					       tcpm_get_current_limit(port),
> +					       5000);
> +		break;
> +
> +	case AUDIO_ACC_ATTACHED:
> +		if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
> +			tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
> +		break;
> +	case AUDIO_ACC_DEBOUNCE:
> +		if (tcpm_port_is_audio(port))
> +			tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
> +		break;
> +
> +	case DEBUG_ACC_ATTACHED:
> +		if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
> +			tcpm_set_state(port, ACC_UNATTACHED, 0);
> +		break;
> +
> +	case SNK_TRY:
> +		/* Do nothing, waiting for timeout */
> +		break;
> +
> +	case SNK_DISCOVERY:
> +		/* CC line is unstable, wait for debounce */
> +		if (tcpm_port_is_disconnected(port))
> +			tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
> +		break;
> +	case SNK_DISCOVERY_DEBOUNCE:
> +		break;
> +
> +	case SRC_TRYWAIT:
> +		/* Hand over to state machine if needed */
> +		if (!port->vbus_present && tcpm_port_is_source(port))
> +			new_state = SRC_ATTACHED;
> +		else
> +			new_state = SRC_TRYWAIT_UNATTACHED;
> +
> +		if (new_state != port->delayed_state)
> +			tcpm_set_state(port, SRC_TRYWAIT, 0);
> +		break;
> +	case SNK_TRY_WAIT:
> +		if (port->vbus_present && tcpm_port_is_sink(port)) {
> +			tcpm_set_state(port, SNK_ATTACHED, 0);
> +			break;
> +		}
> +		if (!tcpm_port_is_sink(port))
> +			new_state = SRC_TRYWAIT;
> +		else
> +			new_state = SRC_TRYWAIT_UNATTACHED;
> +
> +		if (new_state != port->delayed_state)
> +			tcpm_set_state(port, SNK_TRY_WAIT, 0);
> +		break;
> +
> +	case SRC_TRY:
> +		tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
> +		break;
> +	case SRC_TRY_DEBOUNCE:
> +		tcpm_set_state(port, SRC_TRY, 0);
> +		break;
> +	case SNK_TRYWAIT_DEBOUNCE:
> +		if (port->vbus_present) {
> +			tcpm_set_state(port, SNK_ATTACHED, 0);
> +			break;
> +		}
> +		if (tcpm_port_is_source(port)) {
> +			tcpm_set_state(port, SRC_ATTACHED, 0);
> +			break;
> +		}
> +		if (tcpm_port_is_disconnected(port) &&
> +		    port->delayed_state != SNK_UNATTACHED)
> +			tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
> +		break;
> +
> +	case PR_SWAP_SNK_SRC_SINK_OFF:
> +	case PR_SWAP_SRC_SNK_TRANSITION_OFF:
> +	case PR_SWAP_SRC_SNK_SOURCE_OFF:
> +		/*
> +		 * CC state change is expected here; we just turned off power.
> +		 * Ignore it.
> +		 */
> +		break;
> +
> +	default:
> +		if (tcpm_port_is_disconnected(port))
> +			tcpm_set_state(port, unattached_state(port), 0);
> +		break;
> +	}
> +}
> +
> +static void _tcpm_pd_vbus_on(struct tcpm_port *port)
> +{
> +	enum tcpm_state new_state;
> +
> +	tcpm_log_force(port, "VBUS on");
> +	port->vbus_present = true;
> +	switch (port->state) {
> +	case SNK_TRANSITION_SINK_VBUS:
> +		tcpm_set_state(port, SNK_READY, 0);
> +		break;
> +	case SNK_DISCOVERY:
> +		tcpm_set_state(port, SNK_DISCOVERY, 0);
> +		break;
> +
> +	case SNK_DEBOUNCED:
> +		tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
> +							: SNK_ATTACHED,
> +				       0);
> +		break;
> +	case SNK_HARD_RESET_WAIT_VBUS:
> +		tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
> +		break;
> +	case SRC_ATTACHED:
> +		tcpm_set_state(port, SRC_STARTUP, 0);
> +		break;
> +	case SRC_HARD_RESET_VBUS_ON:
> +		tcpm_set_state(port, SRC_STARTUP, 0);
> +		break;
> +
> +	case SNK_TRY:
> +		/* Do nothing, waiting for timeout */
> +		break;
> +	case SRC_TRYWAIT:
> +		/* Hand over to state machine if needed */
> +		if (port->delayed_state != SRC_TRYWAIT_UNATTACHED)
> +			tcpm_set_state(port, SRC_TRYWAIT, 0);
> +		break;
> +	case SNK_TRY_WAIT:
> +		if (tcpm_port_is_sink(port)) {
> +			tcpm_set_state(port, SNK_ATTACHED, 0);
> +			break;
> +		}
> +		if (!tcpm_port_is_sink(port))
> +			new_state = SRC_TRYWAIT;
> +		else
> +			new_state = SRC_TRYWAIT_UNATTACHED;
> +
> +		if (new_state != port->delayed_state)
> +			tcpm_set_state(port, SNK_TRY_WAIT, 0);
> +		break;
> +	case SNK_TRYWAIT:
> +		tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
> +		break;
> +
> +	default:
> +		break;
> +	}
> +}
> +
> +static void _tcpm_pd_vbus_off(struct tcpm_port *port)
> +{
> +	enum tcpm_state new_state;
> +
> +	tcpm_log_force(port, "VBUS off");
> +	port->vbus_present = false;
> +	port->vbus_never_low = false;
> +	switch (port->state) {
> +	case SNK_HARD_RESET_SINK_OFF:
> +		tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
> +		break;
> +	case SRC_HARD_RESET_VBUS_OFF:
> +		tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
> +		break;
> +	case HARD_RESET_SEND:
> +		break;
> +
> +	case SNK_TRY:
> +		/* Do nothing, waiting for timeout */
> +		break;
> +	case SRC_TRYWAIT:
> +		/* Hand over to state machine if needed */
> +		if (tcpm_port_is_source(port))
> +			new_state = SRC_ATTACHED;
> +		else
> +			new_state = SRC_TRYWAIT_UNATTACHED;
> +		if (new_state != port->delayed_state)
> +			tcpm_set_state(port, SRC_TRYWAIT, 0);
> +		break;
> +	case SNK_TRY_WAIT:
> +		if (!tcpm_port_is_sink(port))
> +			new_state = SRC_TRYWAIT;
> +		else
> +			new_state = SRC_TRYWAIT_UNATTACHED;
> +
> +		if (new_state != port->delayed_state)
> +			tcpm_set_state(port, SNK_TRY_WAIT, 0);
> +		break;
> +	case SNK_TRYWAIT_VBUS:
> +		tcpm_set_state(port, SNK_TRYWAIT, 0);
> +		break;
> +
> +	case SNK_ATTACH_WAIT:
> +		tcpm_set_state(port, SNK_UNATTACHED, 0);
> +		break;
> +
> +	case SNK_NEGOTIATE_CAPABILITIES:
> +		break;
> +
> +	case PR_SWAP_SRC_SNK_TRANSITION_OFF:
> +		tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
> +		break;
> +
> +	case PR_SWAP_SNK_SRC_SINK_OFF:
> +		/* Do nothing, expected */
> +		break;
> +
> +	case ERROR_RECOVERY_WAIT_OFF:
> +		tcpm_set_state(port,
> +			       port->pwr_role == TYPEC_SOURCE ?
> +					SRC_UNATTACHED : SNK_UNATTACHED,
> +			       0);
> +		break;
> +
> +	default:
> +		if (port->pwr_role == TYPEC_SINK &&
> +		    port->attached)
> +			tcpm_set_state(port, SNK_UNATTACHED, 0);
> +		break;
> +	}
> +}
> +
> +static void _tcpm_pd_hard_reset(struct tcpm_port *port)
> +{
> +	tcpm_log_force(port, "Received hard reset");
> +	/*
> +	 * If we keep receiving hard reset requests, executing the hard reset
> +	 * must have failed. Revert to error recovery if that happens.
> +	 */
> +	tcpm_set_state(port,
> +		       port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
> +				HARD_RESET_START : ERROR_RECOVERY,
> +		       0);
> +}
> +
> +static void tcpm_pd_event_handler(struct work_struct *work)
> +{
> +	struct tcpm_port *port = container_of(work, struct tcpm_port,
> +					      event_work);
> +	u32 events;
> +
> +	mutex_lock(&port->lock);
> +
> +	spin_lock(&port->pd_event_lock);
> +	while (port->pd_events) {
> +		events = port->pd_events;
> +		port->pd_events = 0;
> +		spin_unlock(&port->pd_event_lock);
> +		if (events & TCPM_RESET_EVENT)
> +			_tcpm_pd_hard_reset(port);
> +		if (events & TCPM_VBUS_EVENT) {
> +			bool vbus;
> +
> +			vbus = port->tcpc->get_vbus(port->tcpc);
> +			if (vbus)
> +				_tcpm_pd_vbus_on(port);
> +			else
> +				_tcpm_pd_vbus_off(port);
> +		}
> +		if (events & TCPM_CC_EVENT) {
> +			enum typec_cc_status cc1, cc2;
> +
> +			if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
> +				_tcpm_cc_change(port, cc1, cc2);
> +		}
> +		spin_lock(&port->pd_event_lock);
> +	}
> +	spin_unlock(&port->pd_event_lock);
> +	mutex_unlock(&port->lock);
> +}
> +
> +void tcpm_cc_change(struct tcpm_port *port)
> +{
> +	spin_lock(&port->pd_event_lock);
> +	port->pd_events |= TCPM_CC_EVENT;
> +	spin_unlock(&port->pd_event_lock);
> +	queue_work(port->wq, &port->event_work);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_cc_change);
> +
> +void tcpm_vbus_change(struct tcpm_port *port)
> +{
> +	spin_lock(&port->pd_event_lock);
> +	port->pd_events |= TCPM_VBUS_EVENT;
> +	spin_unlock(&port->pd_event_lock);
> +	queue_work(port->wq, &port->event_work);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_vbus_change);
> +
> +void tcpm_pd_hard_reset(struct tcpm_port *port)
> +{
> +	spin_lock(&port->pd_event_lock);
> +	port->pd_events = TCPM_RESET_EVENT;
> +	spin_unlock(&port->pd_event_lock);
> +	queue_work(port->wq, &port->event_work);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
> +
> +static int tcpm_dr_set(const struct typec_capability *cap,
> +		       enum typec_data_role data)
> +{
> +	struct tcpm_port *port = typec_cap_to_tcpm(cap);
> +	int ret;
> +
> +	mutex_lock(&port->swap_lock);
> +	mutex_lock(&port->lock);
> +
> +	if (port->typec_caps.type != TYPEC_PORT_DRP || !port->pd_capable) {
> +		ret = -EINVAL;
> +		goto port_unlock;
> +	}
> +	if (port->state != SRC_READY && port->state != SNK_READY) {
> +		ret = -EAGAIN;
> +		goto port_unlock;
> +	}
> +
> +	if (port->data_role == data) {
> +		ret = 0;
> +		goto port_unlock;
> +	}
> +
> +	/*
> +	 * XXX
> +	 * 6.3.9: If an alternate mode is active, a request to swap
> +	 * alternate modes shall trigger a port reset.
> +	 * Reject data role swap request in this case.
> +	 */
> +
> +	port->swap_status = 0;
> +	port->swap_pending = true;
> +	reinit_completion(&port->swap_complete);
> +	tcpm_set_state(port, DR_SWAP_SEND, 0);
> +	mutex_unlock(&port->lock);
> +
> +	wait_for_completion(&port->swap_complete);
> +
> +	ret = port->swap_status;
> +	goto swap_unlock;
> +
> +port_unlock:
> +	mutex_unlock(&port->lock);
> +swap_unlock:
> +	mutex_unlock(&port->swap_lock);
> +	return ret;
> +}
> +
> +static int tcpm_pr_set(const struct typec_capability *cap,
> +		       enum typec_role role)
> +{
> +	struct tcpm_port *port = typec_cap_to_tcpm(cap);
> +	int ret;
> +
> +	mutex_lock(&port->swap_lock);
> +	mutex_lock(&port->lock);
> +
> +	if (port->typec_caps.type != TYPEC_PORT_DRP) {
> +		ret = -EINVAL;
> +		goto port_unlock;
> +	}
> +	if (port->state != SRC_READY && port->state != SNK_READY) {
> +		ret = -EAGAIN;
> +		goto port_unlock;
> +	}
> +
> +	if (role == port->pwr_role) {
> +		ret = 0;
> +		goto port_unlock;
> +	}
> +
> +	if (!port->pd_capable) {
> +		/*
> +		 * If the partner is not PD capable, reset the port to
> +		 * trigger a role change. This can only work if a preferred
> +		 * role is configured, and if it matches the requested role.
> +		 */
> +		if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
> +		    port->try_role == port->pwr_role) {
> +			ret = -EINVAL;
> +			goto port_unlock;
> +		}
> +		tcpm_set_state(port, HARD_RESET_SEND, 0);
> +		ret = 0;
> +		goto port_unlock;
> +	}
> +
> +	port->swap_status = 0;
> +	port->swap_pending = true;
> +	reinit_completion(&port->swap_complete);
> +	tcpm_set_state(port, PR_SWAP_SEND, 0);
> +	mutex_unlock(&port->lock);
> +
> +	wait_for_completion(&port->swap_complete);
> +
> +	ret = port->swap_status;
> +	goto swap_unlock;
> +
> +port_unlock:
> +	mutex_unlock(&port->lock);
> +swap_unlock:
> +	mutex_unlock(&port->swap_lock);
> +	return ret;
> +}
> +
> +static int tcpm_vconn_set(const struct typec_capability *cap,
> +			  enum typec_role role)
> +{
> +	struct tcpm_port *port = typec_cap_to_tcpm(cap);
> +	int ret;
> +
> +	mutex_lock(&port->swap_lock);
> +	mutex_lock(&port->lock);
> +
> +	if (port->state != SRC_READY && port->state != SNK_READY) {
> +		ret = -EAGAIN;
> +		goto port_unlock;
> +	}
> +
> +	if (role == port->vconn_role) {
> +		ret = 0;
> +		goto port_unlock;
> +	}
> +
> +	port->swap_status = 0;
> +	port->swap_pending = true;
> +	reinit_completion(&port->swap_complete);
> +	tcpm_set_state(port, VCONN_SWAP_SEND, 0);
> +	mutex_unlock(&port->lock);
> +
> +	wait_for_completion(&port->swap_complete);
> +
> +	ret = port->swap_status;
> +	goto swap_unlock;
> +
> +port_unlock:
> +	mutex_unlock(&port->lock);
> +swap_unlock:
> +	mutex_unlock(&port->swap_lock);
> +	return ret;
> +}
> +
> +static int tcpm_try_role(const struct typec_capability *cap, int role)
> +{
> +	struct tcpm_port *port = typec_cap_to_tcpm(cap);
> +	struct tcpc_dev	*tcpc = port->tcpc;
> +	int ret = 0;
> +
> +	mutex_lock(&port->lock);
> +	if (tcpc->try_role)
> +		ret = tcpc->try_role(tcpc, role);
> +	if (!ret && !tcpc->config->try_role_hw)
> +		port->try_role = role;
> +	port->try_src_count = 0;
> +	port->try_snk_count = 0;
> +	mutex_unlock(&port->lock);
> +
> +	return ret;
> +}
> +
> +static void tcpm_init(struct tcpm_port *port)
> +{
> +	enum typec_cc_status cc1, cc2;
> +
> +	port->tcpc->init(port->tcpc);
> +
> +	tcpm_reset_port(port);
> +
> +	/*
> +	 * XXX
> +	 * Should possibly wait for VBUS to settle if it was enabled locally
> +	 * since tcpm_reset_port() will disable VBUS.
> +	 */
> +	port->vbus_present = port->tcpc->get_vbus(port->tcpc);
> +	if (port->vbus_present)
> +		port->vbus_never_low = true;
> +
> +	tcpm_set_state(port, tcpm_default_state(port), 0);
> +
> +	if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
> +		_tcpm_cc_change(port, cc1, cc2);
> +
> +	/*
> +	 * Some adapters need a clean slate at startup, and won't recover
> +	 * otherwise. So do not try to be fancy and force a clean disconnect.
> +	 */
> +	tcpm_set_state(port, ERROR_RECOVERY, 0);
> +}
> +
> +void tcpm_tcpc_reset(struct tcpm_port *port)
> +{
> +	mutex_lock(&port->lock);
> +	/* XXX: Maintain PD connection if possible? */
> +	tcpm_init(port);
> +	mutex_unlock(&port->lock);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
> +
> +static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
> +			  unsigned int nr_pdo)
> +{
> +	unsigned int i;
> +
> +	if (nr_pdo > PDO_MAX_OBJECTS)
> +		nr_pdo = PDO_MAX_OBJECTS;
> +
> +	for (i = 0; i < nr_pdo; i++)
> +		dest_pdo[i] = src_pdo[i];
> +
> +	return nr_pdo;
> +}
> +
> +void tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
> +				     unsigned int nr_pdo)
> +{
> +	mutex_lock(&port->lock);
> +	port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, pdo, nr_pdo);
> +	switch (port->state) {
> +	case SRC_UNATTACHED:
> +	case SRC_ATTACH_WAIT:
> +	case SRC_TRYWAIT:
> +		tcpm_set_cc(port, tcpm_rp_cc(port));
> +		break;
> +	case SRC_SEND_CAPABILITIES:
> +	case SRC_NEGOTIATE_CAPABILITIES:
> +	case SRC_READY:
> +	case SRC_WAIT_NEW_CAPABILITIES:
> +		tcpm_set_cc(port, tcpm_rp_cc(port));
> +		tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
> +		break;
> +	default:
> +		break;
> +	}
> +	mutex_unlock(&port->lock);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_update_source_capabilities);
> +
> +void tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
> +				   unsigned int nr_pdo,
> +				   unsigned int max_snk_mv,
> +				   unsigned int max_snk_ma,
> +				   unsigned int max_snk_mw,
> +				   unsigned int operating_snk_mw)
> +{
> +	mutex_lock(&port->lock);
> +	port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, pdo, nr_pdo);
> +	port->max_snk_mv = max_snk_mv;
> +	port->max_snk_ma = max_snk_ma;
> +	port->max_snk_mw = max_snk_mw;
> +	port->operating_snk_mw = operating_snk_mw;
> +
> +	switch (port->state) {
> +	case SNK_NEGOTIATE_CAPABILITIES:
> +	case SNK_READY:
> +	case SNK_TRANSITION_SINK:
> +	case SNK_TRANSITION_SINK_VBUS:
> +		tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
> +		break;
> +	default:
> +		break;
> +	}
> +	mutex_unlock(&port->lock);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities);
> +
> +struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
> +{
> +	struct tcpm_port *port;
> +	int i, err;
> +
> +	if (!dev || !tcpc || !tcpc->config ||
> +	    !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
> +	    !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
> +	    !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
> +		return ERR_PTR(-EINVAL);
> +
> +	port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
> +	if (!port)
> +		return ERR_PTR(-ENOMEM);
> +
> +	port->dev = dev;
> +	port->tcpc = tcpc;
> +
> +	mutex_init(&port->lock);
> +	mutex_init(&port->swap_lock);
> +
> +	port->wq = create_singlethread_workqueue(dev_name(dev));
> +	if (!port->wq)
> +		return ERR_PTR(-ENOMEM);
> +	INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
> +	INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
> +	INIT_WORK(&port->event_work, tcpm_pd_event_handler);
> +
> +	spin_lock_init(&port->pd_event_lock);
> +
> +	init_completion(&port->tx_complete);
> +	init_completion(&port->swap_complete);
> +
> +	port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcpc->config->src_pdo,
> +					  tcpc->config->nr_src_pdo);
> +	port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcpc->config->snk_pdo,
> +					  tcpc->config->nr_snk_pdo);
> +
> +	port->max_snk_mv = tcpc->config->max_snk_mv;
> +	port->max_snk_ma = tcpc->config->max_snk_ma;
> +	port->max_snk_mw = tcpc->config->max_snk_mw;
> +	port->operating_snk_mw = tcpc->config->operating_snk_mw;
> +	if (!tcpc->config->try_role_hw)
> +		port->try_role = tcpc->config->default_role;
> +	else
> +		port->try_role = TYPEC_NO_PREFERRED_ROLE;
> +
> +	port->typec_caps.prefer_role = tcpc->config->default_role;
> +	port->typec_caps.type = tcpc->config->type;
> +	port->typec_caps.revision = 0x0120;	/* Type-C spec release 1.2 */
> +	port->typec_caps.pd_revision = 0x0200;	/* USB-PD spec release 2.0 */
> +	port->typec_caps.dr_set = tcpm_dr_set;
> +	port->typec_caps.pr_set = tcpm_pr_set;
> +	port->typec_caps.vconn_set = tcpm_vconn_set;
> +	port->typec_caps.try_role = tcpm_try_role;
> +
> +	port->partner_desc.identity = &port->partner_ident;
> +
> +	/*
> +	 * TODO:
> +	 *  - alt_modes, set_alt_mode
> +	 *  - {debug,audio}_accessory
> +	 */
> +
> +	port->typec_port = typec_register_port(port->dev, &port->typec_caps);
> +	if (IS_ERR(port->typec_port)) {
> +		err = PTR_ERR(port->typec_port);
> +		goto out_destroy_wq;
> +	}
> +
> +	if (tcpc->config->alt_modes) {
> +		struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
> +
> +		i = 0;
> +		while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
> +			port->port_altmode[i] =
> +			  typec_port_register_altmode(port->typec_port,
> +						      paltmode);
> +			if (!port->port_altmode[i]) {
> +				tcpm_log(port,
> +					 "%s: failed to register port alternate mode 0x%x",
> +					 dev_name(dev), paltmode->svid);
> +				break;
> +			}
> +			i++;
> +			paltmode++;
> +		}
> +	}
> +
> +	tcpm_debugfs_init(port);
> +	mutex_lock(&port->lock);
> +	tcpm_init(port);
> +	mutex_unlock(&port->lock);
> +
> +	tcpm_log(port, "%s: registered", dev_name(dev));
> +	return port;
> +
> +out_destroy_wq:
> +	destroy_workqueue(port->wq);
> +	return ERR_PTR(err);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_register_port);
> +
> +void tcpm_unregister_port(struct tcpm_port *port)
> +{
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
> +		typec_unregister_altmode(port->port_altmode[i]);
> +	typec_unregister_port(port->typec_port);
> +	tcpm_debugfs_exit(port);
> +	destroy_workqueue(port->wq);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_unregister_port);
> +
> +MODULE_AUTHOR("Guenter Roeck <groeck@xxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("USB Type-C Port Manager");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
> new file mode 100644
> index 000000000000..969b365e6549
> --- /dev/null
> +++ b/drivers/staging/typec/tcpm.h
> @@ -0,0 +1,150 @@
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __LINUX_USB_TCPM_H
> +#define __LINUX_USB_TCPM_H
> +
> +#include <linux/bitops.h>
> +#include <linux/usb/typec.h>
> +#include "pd.h"
> +
> +enum typec_cc_status {
> +	TYPEC_CC_OPEN,
> +	TYPEC_CC_RA,
> +	TYPEC_CC_RD,
> +	TYPEC_CC_RP_DEF,
> +	TYPEC_CC_RP_1_5,
> +	TYPEC_CC_RP_3_0,
> +};
> +
> +enum typec_cc_polarity {
> +	TYPEC_POLARITY_CC1,
> +	TYPEC_POLARITY_CC2,
> +};
> +
> +/* Time to wait for TCPC to complete transmit */
> +#define PD_T_TCPC_TX_TIMEOUT  100
> +
> +enum tcpm_transmit_status {
> +	TCPC_TX_SUCCESS = 0,
> +	TCPC_TX_DISCARDED = 1,
> +	TCPC_TX_FAILED = 2,
> +};
> +
> +enum tcpm_transmit_type {
> +	TCPC_TX_SOP = 0,
> +	TCPC_TX_SOP_PRIME = 1,
> +	TCPC_TX_SOP_PRIME_PRIME = 2,
> +	TCPC_TX_SOP_DEBUG_PRIME = 3,
> +	TCPC_TX_SOP_DEBUG_PRIME_PRIME = 4,
> +	TCPC_TX_HARD_RESET = 5,
> +	TCPC_TX_CABLE_RESET = 6,
> +	TCPC_TX_BIST_MODE_2 = 7
> +};
> +
> +struct tcpc_config {
> +	const u32 *src_pdo;
> +	unsigned int nr_src_pdo;
> +
> +	const u32 *snk_pdo;
> +	unsigned int nr_snk_pdo;
> +
> +	unsigned int max_snk_mv;
> +	unsigned int max_snk_ma;
> +	unsigned int max_snk_mw;
> +	unsigned int operating_snk_mw;
> +
> +	enum typec_port_type type;
> +	enum typec_role default_role;
> +	bool try_role_hw;	/* try.{src,snk} implemented in hardware */
> +
> +	struct typec_altmode_desc *alt_modes;
> +};
> +
> +enum tcpc_usb_switch {
> +	TCPC_USB_SWITCH_CONNECT,
> +	TCPC_USB_SWITCH_DISCONNECT,
> +	TCPC_USB_SWITCH_RESTORE,	/* TODO FIXME */
> +};
> +
> +/* Mux state attributes */
> +#define TCPC_MUX_USB_ENABLED		BIT(0)	/* USB enabled */
> +#define TCPC_MUX_DP_ENABLED		BIT(1)	/* DP enabled */
> +#define TCPC_MUX_POLARITY_INVERTED	BIT(2)	/* Polarity inverted */
> +
> +/* Mux modes, decoded to attributes */
> +enum tcpc_mux_mode {
> +	TYPEC_MUX_NONE	= 0,				/* Open switch */
> +	TYPEC_MUX_USB	= TCPC_MUX_USB_ENABLED,		/* USB only */
> +	TYPEC_MUX_DP	= TCPC_MUX_DP_ENABLED,		/* DP only */
> +	TYPEC_MUX_DOCK	= TCPC_MUX_USB_ENABLED |	/* Both USB and DP */
> +			  TCPC_MUX_DP_ENABLED,
> +};
> +
> +struct tcpc_mux_dev {
> +	int (*set)(struct tcpc_mux_dev *dev, enum tcpc_mux_mode mux_mode,
> +		   enum tcpc_usb_switch usb_config,
> +		   enum typec_cc_polarity polarity);
> +	bool dfp_only;
> +	void *priv_data;
> +};
> +
> +struct tcpc_dev {
> +	const struct tcpc_config *config;
> +
> +	int (*init)(struct tcpc_dev *dev);
> +	int (*get_vbus)(struct tcpc_dev *dev);
> +	int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
> +	int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
> +		      enum typec_cc_status *cc2);
> +	int (*set_polarity)(struct tcpc_dev *dev,
> +			    enum typec_cc_polarity polarity);
> +	int (*set_vconn)(struct tcpc_dev *dev, bool on);
> +	int (*set_vbus)(struct tcpc_dev *dev, bool on, bool charge);
> +	int (*set_current_limit)(struct tcpc_dev *dev, u32 max_ma, u32 mv);
> +	int (*set_pd_rx)(struct tcpc_dev *dev, bool on);
> +	int (*set_roles)(struct tcpc_dev *dev, bool attached,
> +			 enum typec_role role, enum typec_data_role data);
> +	int (*start_drp_toggling)(struct tcpc_dev *dev,
> +				  enum typec_cc_status cc);
> +	int (*try_role)(struct tcpc_dev *dev, int role);
> +	int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type type,
> +			   const struct pd_message *msg);
> +	struct tcpc_mux_dev *mux;
> +};
> +
> +struct tcpm_port;
> +
> +struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc);
> +void tcpm_unregister_port(struct tcpm_port *port);
> +
> +void tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
> +				     unsigned int nr_pdo);
> +void tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
> +				   unsigned int nr_pdo,
> +				   unsigned int max_snk_mv,
> +				   unsigned int max_snk_ma,
> +				   unsigned int max_snk_mw,
> +				   unsigned int operating_snk_mw);
> +
> +void tcpm_vbus_change(struct tcpm_port *port);
> +void tcpm_cc_change(struct tcpm_port *port);
> +void tcpm_pd_receive(struct tcpm_port *port,
> +		     const struct pd_message *msg);
> +void tcpm_pd_transmit_complete(struct tcpm_port *port,
> +			       enum tcpm_transmit_status status);
> +void tcpm_pd_hard_reset(struct tcpm_port *port);
> +void tcpm_tcpc_reset(struct tcpm_port *port);
> +
> +#endif /* __LINUX_USB_TCPM_H */
> -- 
> 2.7.4
>