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Subject: Re: [PATCH 2/2] iio: common: cros_ec_sensors: set default frequencies
To:     Fabien Lahoudere <fabien.lahoudere@collabora.com>
Cc:     kernel@collabora.com, Nick Vaccaro <nvaccaro@chromium.org>,
        Jonathan Cameron <jic23@kernel.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
References: <cover.1561642224.git.fabien.lahoudere@collabora.com>
 <7d3972d1200065fe6e98a310e66f53a7ed12e281.1561642224.git.fabien.lahoudere@collabora.com>
From:   Enric Balletbo i Serra <enric.balletbo@collabora.com>
Message-ID: <6ca7ee49-51f9-a65f-5f71-0eac04ee9434@collabora.com>
Date:   Thu, 27 Jun 2019 17:48:57 +0200
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Hi Fabien,

On 27/6/19 16:04, Fabien Lahoudere wrote:
> Version 3 of the EC protocol provides min and max frequencies for EC sensors.
> Default frequencies are provided for earlier protocol.
> 

This patch should really go together with a respin of your previous patchset to
'Expose cros_ec_sensors frequency range via iio sysfs' [1]

[1] https://www.spinics.net/lists/linux-iio/msg44963.html

> 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    | 44 +++++++++++++++++++
>  .../linux/iio/common/cros_ec_sensors_core.h   |  3 ++
>  2 files changed, 47 insertions(+)
> 
> 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 2e0f97448e64..72f56d54cccd 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
> @@ -50,6 +50,37 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
>  	return ret;
>  }
>  
> +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;
> +	}
> +}
> +
>  int cros_ec_sensors_core_init(struct platform_device *pdev,
>  			      struct iio_dev *indio_dev,
>  			      bool physical_device)
> @@ -100,6 +131,19 @@ 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->frequencies[0] = 0;
> +		if (state->msg->version < 3) {
> +			get_default_min_max_freq(state->resp->info.type,
> +						 &state->frequencies[1],
> +						 &state->frequencies[2]);
> +		} else {
> +			state->frequencies[1] =
> +			    state->resp->info_3.min_frequency;
> +			state->frequencies[2] =
> +			    state->resp->info_3.max_frequency;
> +		}
>  	}
>  
>  	return 0;
> diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
> index 0c636b9fe8d7..94c87da22c04 100644
> --- a/include/linux/iio/common/cros_ec_sensors_core.h
> +++ b/include/linux/iio/common/cros_ec_sensors_core.h
> @@ -70,6 +70,9 @@ struct cros_ec_sensors_core_state {
>  				    unsigned long scan_mask, s16 *data);
>  
>  	int curr_sampl_freq;
> +
> +	/* Disable, Min and Max Sampling Frequency in mHz */
> +	int frequencies[3];
>  };
>  
>  /**
>