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

From: Guenter Roeck
Date: Wed Apr 26 2017 - 18:26:43 EST

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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>
---
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

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