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SubjectRe: [PATCH v3 6/8] iio: common: cros_ec_sensors: support protocol v3 message
On Tue, 18 Jun 2019 11:06:37 +0200
Fabien Lahoudere <fabien.lahoudere@collabora.com> wrote:

> 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>
Looks good to me. I'll pick up next time if no one else raises any
issues on this one.

Thanks,

Jonathan

> ---
> .../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];
> };
>
> /**

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