The EC can expose a CEC bus, this patch adds the CEC related definitions
needed by the cros-ec-cec driver.
Having a 16 byte mkbp event size makes it possible to send CEC
messages from the EC to the AP directly inside the mkbp event
instead of first doing a notification and then a read.
Signed-off-by: Stefan Adolfsson <sadolfsson@xxxxxxxxxxxx>
Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
---
drivers/platform/chrome/cros_ec_proto.c | 40 ++++++++++---
include/linux/mfd/cros_ec.h | 2 +-
include/linux/mfd/cros_ec_commands.h | 103 ++++++++++++++++++++++++++++++++
3 files changed, 135 insertions(+), 10 deletions(-)
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index e7bbdf9..c4f6c44 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -504,10 +504,31 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
}
EXPORT_SYMBOL(cros_ec_cmd_xfer_status);
+static int get_next_event_xfer(struct cros_ec_device *ec_dev,
+ struct cros_ec_command *msg,
+ int version, uint32_t size)
+{
+ int ret;
+
+ msg->version = version;
+ msg->command = EC_CMD_GET_NEXT_EVENT;
+ msg->insize = size;
+ msg->outsize = 0;
+
+ ret = cros_ec_cmd_xfer(ec_dev, msg);
+ if (ret > 0) {
+ ec_dev->event_size = ret - 1;
+ memcpy(&ec_dev->event_data, msg->data, ec_dev->event_size);
+ }
+
+ return ret;
+}
+
static int get_next_event(struct cros_ec_device *ec_dev)
{
u8 buffer[sizeof(struct cros_ec_command) + sizeof(ec_dev->event_data)];
struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
+ static int cmd_version = 1;
int ret;
if (ec_dev->suspended) {
@@ -515,18 +536,19 @@ static int get_next_event(struct cros_ec_device *ec_dev)
return -EHOSTDOWN;
}
- msg->version = 0;
- msg->command = EC_CMD_GET_NEXT_EVENT;
- msg->insize = sizeof(ec_dev->event_data);
- msg->outsize = 0;
+ if (cmd_version == 1) {
+ ret = get_next_event_xfer(ec_dev, msg, cmd_version,
+ sizeof(struct ec_response_get_next_event_v1));
+ if (ret < 0 || msg->result != EC_RES_INVALID_VERSION)
+ return ret;
- ret = cros_ec_cmd_xfer(ec_dev, msg);
- if (ret > 0) {
- ec_dev->event_size = ret - 1;
- memcpy(&ec_dev->event_data, msg->data,
- sizeof(ec_dev->event_data));
+ /* Fallback to version 0 for future send attempts */
+ cmd_version = 0;
}
+ ret = get_next_event_xfer(ec_dev, msg, cmd_version,
+ sizeof(struct ec_response_get_next_event));
+
return ret;
}
diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index f36125e..32caef3 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -147,7 +147,7 @@ struct cros_ec_device {
bool mkbp_event_supported;
struct blocking_notifier_head event_notifier;
- struct ec_response_get_next_event event_data;
+ struct ec_response_get_next_event_v1 event_data;
int event_size;
u32 host_event_wake_mask;
};
diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index f2edd99..9b8bc4a 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_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,
};
@@ -2093,12 +2101,31 @@ union ec_response_get_next_data {
uint32_t sysrq;
} __packed;
+union ec_response_get_next_data_v1 {
+ uint8_t key_matrix[16];
+
+ /* Unaligned */
+ uint32_t host_event;
+
+ uint32_t buttons;
+ uint32_t switches;
+ uint32_t sysrq;
+ uint32_t cec_events;
+ uint8_t cec_message[16];
+} __packed;
+
struct ec_response_get_next_event {
uint8_t event_type;
/* Followed by event data if any */
union ec_response_get_next_data data;
} __packed;
+struct ec_response_get_next_event_v1 {
+ uint8_t event_type;
+ /* Followed by event data if any */
+ union ec_response_get_next_data_v1 data;
+} __packed;
+
/* Bit indices for buttons and switches.*/
/* Buttons */
#define EC_MKBP_POWER_BUTTON 0
@@ -2828,6 +2855,82 @@ struct ec_params_reboot_ec {
/* Current version of ACPI memory address space */
#define EC_ACPI_MEM_VERSION_CURRENT 1
+/*****************************************************************************/
+/*
+ * HDMI CEC commands
+ *
+ * These commands are for sending and receiving message via HDMI CEC
+ */
+#define 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[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
+ * @enable: in case cmd is CEC_CMD_ENABLE, this field can be 0 to disable CEC
+ * or 1 to enable CEC functionnality
+ * @address: 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 */
+ union {
+ uint8_t enable;
+ uint8_t address;
+ };
+} __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
+ * @enable: in case cmd was CEC_CMD_ENABLE, this field will 0 if CEC is
+ * disabled or 1 if CEC functionnality is enabled
+ * @address: 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 {
+ union {
+ uint8_t enable;
+ uint8_t address;
+ };
+} __packed;
+
+/* CEC parameters command */
+enum 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 {
+ EC_MKBP_CEC_SEND_OK = BIT(0),
+ EC_MKBP_CEC_SEND_FAILED = BIT(1),
+};
/*****************************************************************************/
/*
--
2.7.4
