From 425d20518c54bc6d66d733fb117a9a4046932d50 Mon Sep 17 00:00:00 2001 From: Reka Norman Date: Fri, 25 Aug 2023 12:43:59 +1000 Subject: media: cros-ec-cec: Support receiving messages from multiple ports Currently, received messages are sent from the EC in the cec_message MKBP event. Since the size of ec_response_get_next_data_v1 is 16 bytes, which is also the maximum size of a CEC message, there is no space to add a port parameter. Increasing the size of ec_response_get_next_data_v1 is an option, but this would increase EC-kernel traffic for all MKBP event types. Instead, use an event to notify that data is ready, and add a new read command to read the data. For backwards compatibility with old EC firmware, continue to handle cec_message events as well. Signed-off-by: Reka Norman Signed-off-by: Hans Verkuil --- include/linux/platform_data/cros_ec_commands.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'include/linux/platform_data') diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index b7e8573a8a49..ad61c7ff0b28 100644 --- a/include/linux/platform_data/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h @@ -4473,6 +4473,27 @@ struct ec_params_cec_write_v1 { uint8_t msg[MAX_CEC_MSG_LEN]; } __ec_align1; +/* CEC message read from a CEC bus reported back to the AP */ +#define EC_CMD_CEC_READ_MSG 0x00B9 + +/** + * struct ec_params_cec_read - Read a message from the CEC bus + * @port: CEC port to read a message on + */ +struct ec_params_cec_read { + uint8_t port; +} __ec_align1; + +/** + * struct ec_response_cec_read - Message read from the CEC bus + * @msg_len: length of msg in bytes + * @msg: message content read from the CEC bus + */ +struct ec_response_cec_read { + uint8_t msg_len; + uint8_t msg[MAX_CEC_MSG_LEN]; +} __ec_align1; + /* Set various CEC parameters */ #define EC_CMD_CEC_SET 0x00BA @@ -4529,6 +4550,8 @@ enum mkbp_cec_event { EC_MKBP_CEC_SEND_OK = BIT(0), /* Outgoing message was not acknowledged */ EC_MKBP_CEC_SEND_FAILED = BIT(1), + /* Incoming message can be read out by AP */ + EC_MKBP_CEC_HAVE_DATA = BIT(2), }; /*****************************************************************************/ -- cgit v1.2.3