[PATCH v2 1/1] iio: common: cros_ec_sensors: determine protocol version

From: Fabien Lahoudere
Date: Fri Jun 28 2019 - 10:41:31 EST


This patch adds a function to determine which version of the
protocol is used to communicate with EC.

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@xxxxxxxxxxxxx>
Signed-off-by: Nick Vaccaro <nvaccaro@xxxxxxxxxxxx>
---
.../cros_ec_sensors/cros_ec_sensors_core.c | 40 ++++++++++++++++++-
1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
index 130362ca421b..75d9b617f6c8 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
@@ -25,6 +25,35 @@ static char *cros_ec_loc[] = {
[MOTIONSENSE_LOC_MAX] = "unknown",
};

+static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
+ u16 cmd_offset, u16 cmd, u32 *mask)
+{
+ int ret;
+ struct {
+ struct cros_ec_command msg;
+ union {
+ struct ec_params_get_cmd_versions params;
+ struct ec_response_get_cmd_versions resp;
+ };
+ } __packed buf = {
+ .msg = {
+ .version = 0,
+ .command = EC_CMD_GET_CMD_VERSIONS + cmd_offset,
+ .insize = sizeof(struct ec_response_get_cmd_versions),
+ .outsize = sizeof(struct ec_params_get_cmd_versions)
+ },
+ .params = {.cmd = cmd}
+ };
+
+ ret = cros_ec_cmd_xfer_status(ec_dev, &buf.msg);
+ if (ret < 0)
+ return ret;
+
+ *mask = buf.resp.version_mask;
+
+ return 0;
+}
+
int cros_ec_sensors_core_init(struct platform_device *pdev,
struct iio_dev *indio_dev,
bool physical_device)
@@ -33,6 +62,8 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
struct cros_ec_dev *ec = dev_get_drvdata(pdev->dev.parent);
struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev);
+ u32 ver_mask;
+ int ret;

platform_set_drvdata(pdev, indio_dev);

@@ -47,8 +78,15 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,

mutex_init(&state->cmd_lock);

+ ret = cros_ec_get_host_cmd_version_mask(state->ec,
+ ec->cmd_offset,
+ EC_CMD_MOTION_SENSE_CMD,
+ &ver_mask);
+ if (ret < 0 || ver_mask == 0)
+ return -ENODEV;
+
/* Set up the host command structure. */
- state->msg->version = 2;
+ state->msg->version = fls(ver_mask) - 1;;
state->msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
state->msg->outsize = sizeof(struct ec_params_motion_sense);

--
2.19.2