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Subject[PATCH v3 6/8] iio: common: cros_ec_sensors: support protocol v3 message
Date
Version 3 of the EC protocol provides min and max frequencies for EC sensors.

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
Signed-off-by: Nick Vaccaro <nvaccaro@chromium.org>
---
.../cros_ec_sensors/cros_ec_sensors_core.c | 85 ++++++++++++++++++-
.../linux/iio/common/cros_ec_sensors_core.h | 3 +
2 files changed, 87 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 57034e212fe1..2ce077b576a4 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
@@ -26,6 +26,66 @@ static char *cros_ec_loc[] = {
[MOTIONSENSE_LOC_MAX] = "unknown",
};

+static void get_default_min_max_freq(enum motionsensor_type type,
+ u32 *min_freq,
+ u32 *max_freq)
+{
+ switch (type) {
+ case MOTIONSENSE_TYPE_ACCEL:
+ case MOTIONSENSE_TYPE_GYRO:
+ *min_freq = 12500;
+ *max_freq = 100000;
+ break;
+ case MOTIONSENSE_TYPE_MAG:
+ *min_freq = 5000;
+ *max_freq = 25000;
+ break;
+ case MOTIONSENSE_TYPE_PROX:
+ case MOTIONSENSE_TYPE_LIGHT:
+ *min_freq = 100;
+ *max_freq = 50000;
+ break;
+ case MOTIONSENSE_TYPE_BARO:
+ *min_freq = 250;
+ *max_freq = 20000;
+ break;
+ case MOTIONSENSE_TYPE_ACTIVITY:
+ default:
+ *min_freq = 0;
+ *max_freq = 0;
+ break;
+ }
+}
+
+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 = {
+ .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) {
+ if (buf.msg.result == EC_RES_SUCCESS)
+ *mask = buf.resp.version_mask;
+ else
+ *mask = 0;
+ }
+ return ret;
+}
+
int cros_ec_sensors_core_init(struct platform_device *pdev,
int num_channels,
bool physical_device)
@@ -35,6 +95,8 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
struct cros_ec_dev *ec = dev_get_drvdata(pdev->dev.parent);
struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev);
struct iio_dev *indio_dev;
+ u32 ver_mask;
+ int ret;

if (num_channels > CROS_EC_SENSORS_CORE_MAX_CHANNELS)
return -EINVAL;
@@ -57,8 +119,16 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,

mutex_init(&state->cmd_lock);

+ /* determine what version of MOTIONSENSE CMD EC has */
+ 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);

@@ -76,6 +146,19 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
}
state->type = state->resp->info.type;
state->loc = state->resp->info.location;
+
+ /* Value to stop the device */
+ state->frequency_range[0] = 0;
+ if (state->msg->version < 3) {
+ get_default_min_max_freq(state->resp->info.type,
+ &state->frequency_range[1],
+ &state->frequency_range[2]);
+ } else {
+ state->frequency_range[1] =
+ state->resp->info_3.min_frequency;
+ state->frequency_range[2] =
+ state->resp->info_3.max_frequency;
+ }
}

indio_dev->info = &state->info;
diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
index 3e6de427076e..89937ad242ef 100644
--- a/include/linux/iio/common/cros_ec_sensors_core.h
+++ b/include/linux/iio/common/cros_ec_sensors_core.h
@@ -74,6 +74,9 @@ struct cros_ec_sensors_core_state {
int curr_sampl_freq;
struct iio_info info;
struct iio_chan_spec channels[CROS_EC_SENSORS_CORE_MAX_CHANNELS];
+
+ /* Disable, Min and Max Sampling Frequency in mHz */
+ int frequency_range[3];
};

/**
--
2.20.1
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