Re: [PATCH v6 4/6] mfd: cros-ec: Introduce CEC commands and events definitions.

[Hans Verkuil]

On 24/05/18 11:57, Neil Armstrong wrote:
> The EC can expose a CEC bus, this patch adds the CEC related definitions
> needed by the cros-ec-cec driver.
> 
> Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> Tested-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>

Reviewed-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>

Thanks!

	Hans

> ---
>  include/linux/mfd/cros_ec_commands.h | 81 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 81 insertions(+)
> 
> diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
> index cc0768e..fe33a81 100644
> --- a/include/linux/mfd/cros_ec_commands.h
> +++ b/include/linux/mfd/cros_ec_commands.h
> @@ -804,6 +804,8 @@ enum ec_feature_code {
>  	EC_FEATURE_MOTION_SENSE_FIFO = 24,
>  	/* EC has RTC feature that can be controlled by host commands */
>  	EC_FEATURE_RTC = 27,
> +	/* EC supports CEC commands */
> +	EC_FEATURE_CEC = 35,
>  };
>  
>  #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
> @@ -2078,6 +2080,12 @@ enum ec_mkbp_event {
>  	/* EC sent a sysrq command */
>  	EC_MKBP_EVENT_SYSRQ = 6,
>  
> +	/* Notify the AP that something happened on CEC */
> +	EC_MKBP_EVENT_CEC_EVENT = 8,
> +
> +	/* Send an incoming CEC message to the AP */
> +	EC_MKBP_EVENT_CEC_MESSAGE = 9,
> +
>  	/* Number of MKBP events */
>  	EC_MKBP_EVENT_COUNT,
>  };
> @@ -2850,6 +2858,79 @@ struct ec_params_reboot_ec {
>  
>  /*****************************************************************************/
>  /*
> + * HDMI CEC commands
> + *
> + * These commands are for sending and receiving message via HDMI CEC
> + */
> +#define EC_MAX_CEC_MSG_LEN 16
> +
> +/* CEC message from the AP to be written on the CEC bus */
> +#define EC_CMD_CEC_WRITE_MSG 0x00B8
> +
> +/**
> + * struct ec_params_cec_write - Message to write to the CEC bus
> + * @msg: message content to write to the CEC bus
> + */
> +struct ec_params_cec_write {
> +	uint8_t msg[EC_MAX_CEC_MSG_LEN];
> +} __packed;
> +
> +/* Set various CEC parameters */
> +#define EC_CMD_CEC_SET 0x00BA
> +
> +/**
> + * struct ec_params_cec_set - CEC parameters set
> + * @cmd: parameter type, can be CEC_CMD_ENABLE or CEC_CMD_LOGICAL_ADDRESS
> + * @val: in case cmd is CEC_CMD_ENABLE, this field can be 0 to disable CEC
> + *	or 1 to enable CEC functionnality, in case cmd is CEC_CMD_LOGICAL_ADDRESS,
> + *	this field encodes the requested logical address between 0 and 15
> + *	or 0xff to unregister
> + */
> +struct ec_params_cec_set {
> +	uint8_t cmd; /* enum cec_command */
> +	uint8_t val;
> +} __packed;
> +
> +/* Read various CEC parameters */
> +#define EC_CMD_CEC_GET 0x00BB
> +
> +/**
> + * struct ec_params_cec_get - CEC parameters get
> + * @cmd: parameter type, can be CEC_CMD_ENABLE or CEC_CMD_LOGICAL_ADDRESS
> + */
> +struct ec_params_cec_get {
> +	uint8_t cmd; /* enum cec_command */
> +} __packed;
> +
> +/**
> + * struct ec_response_cec_get - CEC parameters get response
> + * @val: in case cmd was CEC_CMD_ENABLE, this field will 0 if CEC is
> + *	disabled or 1 if CEC functionnality is enabled,
> + *	in case cmd was CEC_CMD_LOGICAL_ADDRESS, this will encode the
> + *	configured logical address between 0 and 15 or 0xff if unregistered
> + */
> +struct ec_response_cec_get {
> +	uint8_t val;
> +} __packed;
> +
> +/* CEC parameters command */
> +enum ec_cec_command {
> +	/* CEC reading, writing and events enable */
> +	CEC_CMD_ENABLE,
> +	/* CEC logical address  */
> +	CEC_CMD_LOGICAL_ADDRESS,
> +};
> +
> +/* Events from CEC to AP */
> +enum mkbp_cec_event {
> +	/* Outgoing message was acknowledged by a follower */
> +	EC_MKBP_CEC_SEND_OK			= BIT(0),
> +	/* Outgoing message was not acknowledged */
> +	EC_MKBP_CEC_SEND_FAILED			= BIT(1),
> +};
> +
> +/*****************************************************************************/
> +/*
>   * Special commands
>   *
>   * These do not follow the normal rules for commands.  See each command for
>