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Date:   Sat, 27 Jul 2019 23:16:37 +0100
From:   Jonathan Cameron <jic23@kernel.org>
To:     Fabien Lahoudere <fabien.lahoudere@collabora.com>
Cc:     kernel@collabora.com, Nick Vaccaro <nvaccaro@chromium.org>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Hartmut Knaack <knaack.h@gmx.de>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        Benson Leung <bleung@chromium.org>,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        Guenter Roeck <groeck@chromium.org>,
        Gwendal Grignou <gwendal@chromium.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Alexios Zavras <alexios.zavras@intel.com>,
        Allison Randal <allison@lohutok.net>,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 1/1] iio: common: cros_ec_sensors: Expose
 cros_ec_sensors frequency range via iio sysfs
Message-ID: <20190727231112.3dde6723@archlinux>
In-Reply-To: <36eda13de50426c1b5e46a201e17122f9d899f1a.1563268064.git.fabien.lahoudere@collabora.com>
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        <36eda13de50426c1b5e46a201e17122f9d899f1a.1563268064.git.fabien.lahoudere@collabora.com>
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On Tue, 16 Jul 2019 11:11:06 +0200
Fabien Lahoudere <fabien.lahoudere@collabora.com> wrote:

> Embedded controller return minimum and maximum frequencies, unfortunately
> we have no way to know the step for all available frequencies.
> Even if not complete, we can return a list of known values using the
> standard read_avail callback (IIO_CHAN_INFO_SAMP_FREQ) to provide them to
> userland.
> 
> Now cros_ec_* sensors provides frequencies values in sysfs like this:
> "0 min max". 0 is always true to disable the sensor.
> 
> Default frequencies are provided for earlier protocol.
> 
> Signed-off-by: Nick Vaccaro <nvaccaro@chromium.org>
> Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

I applied a version Enric had rebased. Hopefully it matches this!
Was easier than repeating his conflict resolution.

thanks,

Jonathan

> ---
>  .../common/cros_ec_sensors/cros_ec_sensors.c  |  3 +
>  .../cros_ec_sensors/cros_ec_sensors_core.c    | 65 +++++++++++++++++++
>  drivers/iio/light/cros_ec_light_prox.c        |  3 +
>  .../linux/iio/common/cros_ec_sensors_core.h   | 21 ++++++
>  4 files changed, 92 insertions(+)
> 
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> index 17af4e0fd5f8..dbca02688c4f 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> @@ -175,6 +175,7 @@ static int cros_ec_sensors_write(struct iio_dev *indio_dev,
>  static const struct iio_info ec_sensors_info = {
>  	.read_raw = &cros_ec_sensors_read,
>  	.write_raw = &cros_ec_sensors_write,
> +	.read_avail = &cros_ec_sensors_core_read_avail,
>  };
>  
>  static int cros_ec_sensors_probe(struct platform_device *pdev)
> @@ -211,6 +212,8 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
>  			BIT(IIO_CHAN_INFO_SCALE) |
>  			BIT(IIO_CHAN_INFO_FREQUENCY) |
>  			BIT(IIO_CHAN_INFO_SAMP_FREQ);
> +		channel->info_mask_shared_by_all_available =
> +			BIT(IIO_CHAN_INFO_SAMP_FREQ);
>  		channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
>  		channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
>  		channel->scan_index = i;
> 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 81111af8a167..805652250960 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;
> +
> +		/* 0 is a correct value used 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;
> @@ -461,6 +505,27 @@ int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
>  }
>  EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read);
>  
> +int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
> +				    struct iio_chan_spec const *chan,
> +				    const int **vals,
> +				    int *type,
> +				    int *length,
> +				    long mask)
> +{
> +	struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_SAMP_FREQ:
> +		*length = ARRAY_SIZE(state->frequencies);
> +		*vals = (const int *)&state->frequencies;
> +		*type = IIO_VAL_INT;
> +		return IIO_AVAIL_LIST;
> +	}
> +
> +	return -EINVAL;
> +}
> +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read_avail);
> +
>  int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st,
>  			       struct iio_chan_spec const *chan,
>  			       int val, int val2, long mask)
> diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
> index 308ee6ff2e22..b9838bf25248 100644
> --- a/drivers/iio/light/cros_ec_light_prox.c
> +++ b/drivers/iio/light/cros_ec_light_prox.c
> @@ -164,6 +164,7 @@ static int cros_ec_light_prox_write(struct iio_dev *indio_dev,
>  static const struct iio_info cros_ec_light_prox_info = {
>  	.read_raw = &cros_ec_light_prox_read,
>  	.write_raw = &cros_ec_light_prox_write,
> +	.read_avail = &cros_ec_sensors_core_read_avail,
>  };
>  
>  static int cros_ec_light_prox_probe(struct platform_device *pdev)
> @@ -198,6 +199,8 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
>  	channel->info_mask_shared_by_all =
>  		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
>  		BIT(IIO_CHAN_INFO_FREQUENCY);
> +	channel->info_mask_shared_by_all_available =
> +		BIT(IIO_CHAN_INFO_SAMP_FREQ);
>  	channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
>  	channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
>  	channel->scan_type.shift = 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..a9623111f7c9 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;
> +
> +	/* Table of known available frequencies : 0, Min and Max in mHz */
> +	int frequencies[3];
>  };
>  
>  /**
> @@ -150,6 +153,24 @@ int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
>  			      struct iio_chan_spec const *chan,
>  			      int *val, int *val2, long mask);
>  
> +/**
> + * cros_ec_sensors_core_read_avail() - get available values
> + * @indio_dev:		pointer to state information for device
> + * @chan:	channel specification structure table
> + * @vals:	list of available values
> + * @type:	type of data returned
> + * @length:	number of data returned in the array
> + * @mask:	specifies which values to be requested
> + *
> + * Return:	an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST
> + */
> +int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
> +				    struct iio_chan_spec const *chan,
> +				    const int **vals,
> +				    int *type,
> +				    int *length,
> +				    long mask);
> +
>  /**
>   * cros_ec_sensors_core_write() - function to write a value to the sensor
>   * @st:		pointer to state information for device