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Date:   Sat, 22 Jun 2019 11:15:09 +0100
From:   Jonathan Cameron <jic23@kernel.org>
To:     Fabien Lahoudere <fabien.lahoudere@collabora.com>
Cc:     kernel@collabora.com, Nick Vaccaro <nvaccaro@chromium.org>,
        Hartmut Knaack <knaack.h@gmx.de>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 6/8] iio: common: cros_ec_sensors: support protocol
 v3 message
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        <ac3cdc104e59565d178dfa86f2727045224dc4da.1560848479.git.fabien.lahoudere@collabora.com>
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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];
>  };
>  
>  /**