mfd: cros-ec: Introduce CEC commands and events definitions.

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@baylibre.com>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index c4f0caa642beb43968f87439bd4ee3df0156e57e..5079bc2d4378087a2af2190bce4985d87f48c0c3 100644 (file)
--- 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,
 };
@@ -2845,6 +2853,79 @@ struct ec_params_reboot_ec {
 #define EC_ACPI_MEM_VERSION_CURRENT 1
 
 
+/*****************************************************************************/
+/*
+ * 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 functionality, 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 functionality 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