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Date:   Thu, 23 Apr 2020 09:50:30 +0200 (CEST)
From:   Peter Meerwald-Stadler <pmeerw@pmeerw.net>
To:     Gwendal Grignou <gwendal@chromium.org>
cc:     enric.balletbo@collabora.com, jic23@kernel.org,
        bleung@chromium.org, groeck@chromium.org,
        linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org
Subject: Re: [PATCH 2/2] iio: cros_ec_light: Add support for RGB sensor
In-Reply-To: <20200423000230.82750-3-gwendal@chromium.org>
Message-ID: <alpine.DEB.2.21.2004230920330.25067@vps.pmeerw.net>
References: <20200423000230.82750-1-gwendal@chromium.org> <20200423000230.82750-3-gwendal@chromium.org>
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On Wed, 22 Apr 2020, Gwendal Grignou wrote:

comments below

> Add support for color sensors behind EC like TCS3400.
> The color data can be presented in Red Green Blue color space (RGB) or
> the CIE 1931 XYZ color space (XYZ).
> In XYZ mode, the sensor is configured for auto calibrating its channels
> and is the "normal" mode.
> The driver tells the EC to switch between the 2 modes by using the
> calibration command.
> When the sensor is in calibration mode, only clear and RGB channels are
> available. In normal mode, only clear and XYZ are.
> When RGB channels are enabled, the sensor switches to calibration mode
> when the buffer is enabled.
> 
> When reading trhough sysfs command, set calibration mode and then read
> the channel(s). A command will be issue for each read, so the channels
> may come from different sensor sample.
> When using the buffer, after setting the mask, when the buffer is
> enabled, the calibration will be set based on the channel mask.
> 
> libiio tools can be used to gather sensor information:
> iio_readdev -s 10 cros-ec-light \
> illuminance_clear illuminance_x illuminance_y illuminance_z
> 
> To match IIO ABI, the clear illuminance channel has been renamed
> in_illuminance_clear_raw from in_illuminance_input.
> 
> Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
> ---
>  drivers/iio/light/cros_ec_light_prox.c        | 470 +++++++++++++++---
>  drivers/platform/chrome/cros_ec_sensorhub.c   |   3 +
>  .../linux/iio/common/cros_ec_sensors_core.h   |   1 -
>  .../linux/platform_data/cros_ec_commands.h    |   2 +
>  4 files changed, 405 insertions(+), 71 deletions(-)
> 
> diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
> index 2198b50909ed0..57eee557a785c 100644
> --- a/drivers/iio/light/cros_ec_light_prox.c
> +++ b/drivers/iio/light/cros_ec_light_prox.c
> @@ -17,82 +17,190 @@
>  #include <linux/module.h>
>  #include <linux/platform_data/cros_ec_commands.h>
>  #include <linux/platform_data/cros_ec_proto.h>
> +#include <linux/platform_data/cros_ec_sensorhub.h>
>  #include <linux/platform_device.h>
>  #include <linux/slab.h>
>  
>  /*
> - * We only represent one entry for light or proximity. EC is merging different
> - * light sensors to return the what the eye would see. For proximity, we
> - * currently support only one light source.
> + * We may present up to 7 channels:
> + *
> + * +-----+-----+-----+-----+-----+-----+-----+
> + * |Clear|  X  |  Y  |  Z  | RED |BLUE |GREEN|
> + * |Prox |     |     |     |     |     |     |
> + * +-----+-----+-----+-----+-----+-----+-----+
> + *
> + * Prox[imity] is presented by proximity sensors.
> + * The clear channel is supported by single and color light sensors.
> + * Color light sensor either reports color information in the RGB space or
> + * the CIE 1931 XYZ (XYZ) color space.
>   */
> -#define CROS_EC_LIGHT_PROX_MAX_CHANNELS (1 + 1)
> +#define CROS_EC_LIGHT_CLEAR_OR_PROXIMITY_MASK 1
> +#define CROS_EC_LIGHT_XYZ_SPACE_MASK (0x7 << 1)
> +#define CROS_EC_LIGHT_RGB_SPACE_MASK (0x7 << 4)

could use GENMASK()

> +
> +/*
> + * We always represent one entry for light or proximity, and all
> + * samples can be timestamped.
> + */
> +#define CROS_EC_LIGHT_PROX_MIN_CHANNELS (1 + 1)
> +
> +static const unsigned long cros_ec_light_prox_bitmasks[] = {
> +	CROS_EC_LIGHT_CLEAR_OR_PROXIMITY_MASK,
> +	CROS_EC_LIGHT_XYZ_SPACE_MASK,
> +	CROS_EC_LIGHT_XYZ_SPACE_MASK | CROS_EC_LIGHT_CLEAR_OR_PROXIMITY_MASK,
> +	CROS_EC_LIGHT_RGB_SPACE_MASK,
> +	CROS_EC_LIGHT_RGB_SPACE_MASK | CROS_EC_LIGHT_CLEAR_OR_PROXIMITY_MASK,

so it's not possible to read all 7 channels in one go?
maybe that's not really needed

> +	0,
> +};
> +
> +#define CROS_EC_IDX_TO_CHAN(_idx) (((_idx) - 1) % CROS_EC_SENSOR_MAX_AXIS)

may CROS_EC_LIGHT_IDX_TO_CHAN for consistency

MAX_AXIS sounds more like something for an accelerometer (which also has 3 
components by incident)

X, Y, Z is not documented (sysfs-bus-iio) to can represent color 
components

>  
>  /* State data for ec_sensors iio driver. */
>  struct cros_ec_light_prox_state {
>  	/* Shared by all sensors */
>  	struct cros_ec_sensors_core_state core;
> +	struct iio_chan_spec *channel;
>  
> -	struct iio_chan_spec channels[CROS_EC_LIGHT_PROX_MAX_CHANNELS];
> +	/* Calibration information for the color channels. */
> +	struct calib_data rgb_calib[CROS_EC_SENSOR_MAX_AXIS];
>  };
>  
> +static void cros_ec_light_channel_common(struct iio_chan_spec *channel)
> +{
> +	channel->info_mask_shared_by_all =
> +		BIT(IIO_CHAN_INFO_SAMP_FREQ);
> +	channel->info_mask_shared_by_all_available =
> +		BIT(IIO_CHAN_INFO_SAMP_FREQ);

why is this needed, _SAMP_FREQ twice?

> +	channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> +	channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> +	channel->scan_type.shift = 0;
> +	channel->scan_index = 0;
> +	channel->ext_info = cros_ec_sensors_ext_info;
> +	channel->scan_type.sign = 'u';
> +}
> +
> +static int
> +cros_ec_light_extra_send_host_cmd(struct cros_ec_sensors_core_state *state,
> +				  int increment, u16 opt_length)
> +{
> +	u8 save_sensor_num = state->param.info.sensor_num;
> +	int ret;
> +
> +	state->param.info.sensor_num += increment;
> +	ret = cros_ec_motion_send_host_cmd(state, opt_length);
> +	state->param.info.sensor_num = save_sensor_num;
> +	return ret;
> +}
> +
> +static int cros_ec_light_prox_read_data(struct iio_dev *indio_dev,
> +					struct iio_chan_spec const *chan,
> +					int *val)
> +{
> +	struct cros_ec_light_prox_state *st = iio_priv(indio_dev);
> +	int ret;
> +	int idx = chan->scan_index;
> +	s16 data;
> +
> +	/*
> +	 * The data coming from the light sensor is
> +	 * pre-processed and represents the ambient light
> +	 * illuminance reading expressed in lux.
> +	 */
> +	if (idx == 0) {
> +		ret = cros_ec_sensors_read_cmd(indio_dev, 1, &data);
> +		if (ret < 0)
> +			return ret;
> +		*val = data;
> +	} else {
> +		ret = cros_ec_light_extra_send_host_cmd(
> +				&st->core, 1, sizeof(st->core.resp->data));
> +		if (ret)
> +			return ret;
> +		*val = st->core.resp->data.data[CROS_EC_IDX_TO_CHAN(idx)];
> +	}
> +	return IIO_VAL_INT;
> +}
> +
> +static int cros_ec_light_read_color_scale(struct cros_ec_light_prox_state *st,
> +					  int idx, int *val, int *val2)
> +{
> +	int ret, i;
> +	u16 scale;
> +
> +	st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_SCALE;
> +	st->core.param.sensor_scale.flags = 0;
> +	if (idx == 0)
> +		ret = cros_ec_motion_send_host_cmd(&st->core, 0);
> +	else
> +		ret = cros_ec_light_extra_send_host_cmd(&st->core, 1, 0);
> +	if (ret)
> +		return ret;
> +
> +	if (idx == 0) {
> +		scale = st->core.resp->sensor_scale.scale[0];
> +		st->core.calib[0].scale = scale;
> +	} else {
> +		for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
> +			st->rgb_calib[i].scale =
> +				st->core.resp->sensor_scale.scale[i];
> +		scale = st->rgb_calib[CROS_EC_IDX_TO_CHAN(idx)].scale;
> +	}
> +	/*
> +	 * scale is a number x.y, where x is coded on 1 bit,
> +	 * y coded on 15 bits, between 0 and 9999.
> +	 */
> +	*val = scale >> 15;
> +	*val2 = ((scale & 0x7FFF) * 1000000LL) /
> +		MOTION_SENSE_DEFAULT_SCALE;
> +	return IIO_VAL_INT_PLUS_MICRO;
> +}
> +
>  static int cros_ec_light_prox_read(struct iio_dev *indio_dev,
>  				   struct iio_chan_spec const *chan,
>  				   int *val, int *val2, long mask)
>  {
>  	struct cros_ec_light_prox_state *st = iio_priv(indio_dev);
> -	u16 data = 0;
> -	s64 val64;
> -	int ret;
> +	int i, ret = IIO_VAL_INT;
>  	int idx = chan->scan_index;
> +	s64 val64;
>  
>  	mutex_lock(&st->core.cmd_lock);
> -
>  	switch (mask) {
>  	case IIO_CHAN_INFO_RAW:
> -		if (chan->type == IIO_PROXIMITY) {
> -			ret = cros_ec_sensors_read_cmd(indio_dev, 1 << idx,
> -						     (s16 *)&data);
> -			if (ret)
> -				break;
> -			*val = data;
> -			ret = IIO_VAL_INT;
> -		} else {
> -			ret = -EINVAL;
> -		}
> -		break;
> -	case IIO_CHAN_INFO_PROCESSED:
> -		if (chan->type == IIO_LIGHT) {
> -			ret = cros_ec_sensors_read_cmd(indio_dev, 1 << idx,
> -						     (s16 *)&data);
> -			if (ret)
> -				break;
> -			/*
> -			 * The data coming from the light sensor is
> -			 * pre-processed and represents the ambient light
> -			 * illuminance reading expressed in lux.
> -			 */
> -			*val = data;
> -			ret = IIO_VAL_INT;
> -		} else {
> -			ret = -EINVAL;
> -		}
> +		ret = cros_ec_light_prox_read_data(indio_dev, chan, val);
>  		break;
>  	case IIO_CHAN_INFO_CALIBBIAS:
>  		st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;
>  		st->core.param.sensor_offset.flags = 0;
>  
> -		ret = cros_ec_motion_send_host_cmd(&st->core, 0);
> +		if (idx == 0)
> +			ret = cros_ec_motion_send_host_cmd(&st->core, 0);
> +		else
> +			ret = cros_ec_light_extra_send_host_cmd(
> +					&st->core, 1, 0);
>  		if (ret)
>  			break;
> -
> -		/* Save values */
> -		st->core.calib[0].offset =
> -			st->core.resp->sensor_offset.offset[0];
> -
> -		*val = st->core.calib[idx].offset;
> +		if (idx == 0) {
> +			*val = st->core.calib[0].offset =
> +				st->core.resp->sensor_offset.offset[0];
> +		} else {
> +			for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS;
> +			     i++)
> +				st->rgb_calib[i].offset =
> +					st->core.resp->sensor_offset.offset[i];
> +			*val = st->rgb_calib[CROS_EC_IDX_TO_CHAN(idx)].offset;
> +		}
>  		ret = IIO_VAL_INT;
>  		break;
>  	case IIO_CHAN_INFO_CALIBSCALE:
> +		if (indio_dev->num_channels > CROS_EC_LIGHT_PROX_MIN_CHANNELS) {
> +			ret = cros_ec_light_read_color_scale(st, idx, val,
> +							     val2);
> +			break;
> +		}
> +		/* RANGE is used for calibration in 1 channel sensors. */
> +		fallthrough;
> +	case IIO_CHAN_INFO_SCALE:
>  		/*
>  		 * RANGE is used for calibration
>  		 * scale is a number x.y, where x is coded on 16 bits,
> @@ -121,29 +229,84 @@ static int cros_ec_light_prox_read(struct iio_dev *indio_dev,
>  	return ret;
>  }
>  
> +static int cros_ec_light_write_color_scale(struct cros_ec_light_prox_state *st,
> +					   int idx, int val, int val2)
> +{
> +	int i;
> +	u16 scale;
> +
> +	if (val >= 2) {
> +		/*
> +		 * The user space is sending values already
> +		 * multiplied by MOTION_SENSE_DEFAULT_SCALE.
> +		 */
> +		scale = val;
> +	} else {
> +		u64 val64 = val2 * MOTION_SENSE_DEFAULT_SCALE;
> +
> +		do_div(val64, 1000000);
> +		scale = (val << 15) | val64;
> +	}
> +
> +	st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_SCALE;
> +	st->core.param.sensor_offset.flags = MOTION_SENSE_SET_OFFSET;
> +	st->core.param.sensor_offset.temp = EC_MOTION_SENSE_INVALID_CALIB_TEMP;
> +	if (idx == 0) {
> +		st->core.calib[0].scale = scale;
> +		st->core.param.sensor_scale.scale[0] = scale;
> +		return cros_ec_motion_send_host_cmd(&st->core, 0);
> +	}
> +
> +	st->rgb_calib[CROS_EC_IDX_TO_CHAN(idx)].scale = scale;
> +	for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS; i++)
> +		st->core.param.sensor_scale.scale[i] = st->rgb_calib[i].scale;
> +	return cros_ec_light_extra_send_host_cmd(&st->core, 1, 0);
> +}
> +
>  static int cros_ec_light_prox_write(struct iio_dev *indio_dev,
>  			       struct iio_chan_spec const *chan,
>  			       int val, int val2, long mask)
>  {
>  	struct cros_ec_light_prox_state *st = iio_priv(indio_dev);
> -	int ret;
> +	int ret, i;
>  	int idx = chan->scan_index;
>  
>  	mutex_lock(&st->core.cmd_lock);
>  
>  	switch (mask) {
>  	case IIO_CHAN_INFO_CALIBBIAS:
> -		st->core.calib[idx].offset = val;
>  		/* Send to EC for each axis, even if not complete */
>  		st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_OFFSET;
>  		st->core.param.sensor_offset.flags = MOTION_SENSE_SET_OFFSET;
> -		st->core.param.sensor_offset.offset[0] =
> -			st->core.calib[0].offset;
>  		st->core.param.sensor_offset.temp =
>  					EC_MOTION_SENSE_INVALID_CALIB_TEMP;
> -		ret = cros_ec_motion_send_host_cmd(&st->core, 0);
> +		if (idx == 0) {
> +			st->core.calib[0].offset = val;
> +			st->core.param.sensor_offset.offset[0] = val;
> +			ret = cros_ec_motion_send_host_cmd(&st->core, 0);
> +		} else {
> +			st->rgb_calib[CROS_EC_IDX_TO_CHAN(idx)].offset = val;
> +			for (i = CROS_EC_SENSOR_X;
> +			     i < CROS_EC_SENSOR_MAX_AXIS;
> +			     i++)
> +				st->core.param.sensor_offset.offset[i] =
> +					st->rgb_calib[i].offset;
> +			ret = cros_ec_light_extra_send_host_cmd(
> +					&st->core, 1, 0);
> +		}
>  		break;
>  	case IIO_CHAN_INFO_CALIBSCALE:
> +		if (indio_dev->num_channels > CROS_EC_LIGHT_PROX_MIN_CHANNELS) {
> +			ret = cros_ec_light_write_color_scale(st, idx,
> +							      val, val2);
> +			break;
> +		}
> +		/*
> +		 * For sensors with only one channel, _RANGE is used
> +		 * instead of _SCALE.
> +		 */
> +		fallthrough;
> +	case IIO_CHAN_INFO_SCALE:
>  		st->core.param.cmd = MOTIONSENSE_CMD_SENSOR_RANGE;
>  		st->core.param.sensor_range.data = (val << 16) | (val2 / 100);
>  		ret = cros_ec_motion_send_host_cmd(&st->core, 0);
> @@ -159,27 +322,154 @@ static int cros_ec_light_prox_write(struct iio_dev *indio_dev,
>  	return ret;
>  }
>  
> +static int cros_ec_light_push_data(struct iio_dev *indio_dev,
> +				   s16 *data,
> +				   s64 timestamp)
> +{
> +	struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
> +	unsigned long scan_mask;
> +
> +	if (!st || !indio_dev->active_scan_mask)
> +		return 0;
> +
> +	scan_mask = *indio_dev->active_scan_mask;
> +	if ((scan_mask & ~CROS_EC_LIGHT_CLEAR_OR_PROXIMITY_MASK) == 0)
> +		/*
> +		 * Only one channel at most is used.
> +		 * Use regular push function.
> +		 */
> +		return cros_ec_sensors_push_data(indio_dev, data, timestamp);
> +
> +	if (scan_mask & CROS_EC_LIGHT_CLEAR_OR_PROXIMITY_MASK)
> +		/*
> +		 * Save clear channel, will be used when RGB data arrives.
> +		 */
> +		st->samples[0] = data[0];
> +
> +	return 0;
> +}
> +
> +static int cros_ec_light_push_data_rgb(struct iio_dev *indio_dev,
> +				       s16 *data,
> +				       s64 timestamp)
> +{
> +	struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
> +	s16 *out;
> +	unsigned long scan_mask;
> +	unsigned int i;
> +
> +	if (!st || !indio_dev->active_scan_mask)
> +		return 0;
> +
> +	scan_mask = *indio_dev->active_scan_mask;
> +	/*
> +	 * Send all data needed.
> +	 */
> +	out = (s16 *)st->samples;
> +	for_each_set_bit(i,
> +			 indio_dev->active_scan_mask,
> +			 indio_dev->masklength) {
> +		if (i > 0)
> +			*out = data[CROS_EC_IDX_TO_CHAN(i)];
> +		out++;
> +	}
> +	iio_push_to_buffers_with_timestamp(indio_dev, st->samples, timestamp);
> +	return 0;
> +}
> +
> +static irqreturn_t cros_ec_light_capture(int irq, void *p)
> +{
> +	struct iio_poll_func *pf = p;
> +	struct iio_dev *indio_dev = pf->indio_dev;
> +	struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
> +	int ret, i, idx = 0;
> +	s16 data;
> +	const unsigned long scan_mask = *indio_dev->active_scan_mask;
> +
> +	mutex_lock(&st->cmd_lock);
> +
> +	/* Clear capture data. */
> +	memset(st->samples, 0, indio_dev->scan_bytes);
> +
> +	/* Read first channel. */
> +	ret = cros_ec_sensors_read_cmd(indio_dev, 1, &data);
> +	if (ret < 0) {
> +		mutex_unlock(&st->cmd_lock);
> +		goto done;
> +	}
> +	if (scan_mask & CROS_EC_LIGHT_CLEAR_OR_PROXIMITY_MASK)
> +		((s16 *)st->samples)[idx++] = data;
> +
> +	/* Read remaining channels. */
> +	if ((scan_mask & CROS_EC_LIGHT_XYZ_SPACE_MASK) ||
> +	    (scan_mask & CROS_EC_LIGHT_RGB_SPACE_MASK)) {
> +		ret = cros_ec_light_extra_send_host_cmd(
> +				st, 1, sizeof(st->resp->data));
> +		if (ret < 0) {
> +			mutex_unlock(&st->cmd_lock);
> +			goto done;
> +		}
> +		for (i = 0; i < CROS_EC_SENSOR_MAX_AXIS; i++)
> +			((s16 *)st->samples)[idx++] = st->resp->data.data[i];
> +	}
> +	mutex_unlock(&st->cmd_lock);
> +
> +	iio_push_to_buffers_with_timestamp(indio_dev, st->samples,
> +					   iio_get_time_ns(indio_dev));
> +
> +done:
> +	iio_trigger_notify_done(indio_dev->trig);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int cros_ec_light_prox_update_scan_mode(struct iio_dev *indio_dev,
> +					       const unsigned long *scan_mask)
> +{
> +	struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
> +	int ret;
> +	bool enable_raw_mode;
> +
> +	if (*scan_mask & CROS_EC_LIGHT_XYZ_SPACE_MASK)
> +		enable_raw_mode = false;
> +	else if (*scan_mask & CROS_EC_LIGHT_RGB_SPACE_MASK)
> +		enable_raw_mode = true;
> +	else
> +		/* Just clear channel or proxmity, nothing to do. */
> +		return 0;
> +
> +	mutex_lock(&st->cmd_lock);
> +	st->param.cmd = MOTIONSENSE_CMD_PERFORM_CALIB;
> +	st->param.perform_calib.enable = enable_raw_mode;
> +	ret = cros_ec_motion_send_host_cmd(st, 0);
> +	mutex_unlock(&st->cmd_lock);
> +
> +	return ret;
> +}
> +
>  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,
> +	.update_scan_mode = &cros_ec_light_prox_update_scan_mode,
>  };
>  
>  static int cros_ec_light_prox_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> +	struct cros_ec_sensorhub *sensor_hub = dev_get_drvdata(dev->parent);
>  	struct iio_dev *indio_dev;
>  	struct cros_ec_light_prox_state *state;
>  	struct iio_chan_spec *channel;
> -	int ret;
> +	int ret, i, num_channels = CROS_EC_LIGHT_PROX_MIN_CHANNELS;
>  
>  	indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
>  	if (!indio_dev)
>  		return -ENOMEM;
>  
>  	ret = cros_ec_sensors_core_init(pdev, indio_dev, true,
> -					cros_ec_sensors_capture,
> -					cros_ec_sensors_push_data);
> +					cros_ec_light_capture,
> +					cros_ec_light_push_data);
>  	if (ret)
>  		return ret;
>  
> @@ -189,28 +479,40 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
>  	state = iio_priv(indio_dev);
>  	state->core.type = state->core.resp->info.type;
>  	state->core.loc = state->core.resp->info.location;
> -	channel = state->channels;
>  
> -	/* Common part */
> -	channel->info_mask_shared_by_all =
> -		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_type.shift = 0;
> -	channel->scan_index = 0;
> -	channel->ext_info = cros_ec_sensors_ext_info;
> -	channel->scan_type.sign = 'u';
> +	/* Check if we need more sensors for RGB (or XYZ). */
> +	state->core.param.cmd = MOTIONSENSE_CMD_INFO;
> +	if (cros_ec_light_extra_send_host_cmd(&state->core, 1, 0) == 0 &&
> +	    state->core.resp->info.type == MOTIONSENSE_TYPE_LIGHT_RGB)
> +		num_channels += 2 * CROS_EC_SENSOR_MAX_AXIS;
> +
> +	channel = devm_kcalloc(dev, num_channels, sizeof(*channel), 0);
> +	if (!channel)
> +		return -ENOMEM;
> +
> +	indio_dev->channels = channel;
> +	indio_dev->num_channels = num_channels;
> +	indio_dev->available_scan_masks = cros_ec_light_prox_bitmasks;
>  
> +	cros_ec_light_channel_common(channel);
>  	/* Sensor specific */
>  	switch (state->core.type) {
>  	case MOTIONSENSE_TYPE_LIGHT:
>  		channel->type = IIO_LIGHT;
> +		if (num_channels > CROS_EC_LIGHT_PROX_MIN_CHANNELS) {
> +			/*
> +			 * To set a global scale, as CALIB_SCALE for RGB sensor
> +			 * is limited between 0 and 2.
> +			 */
> +			channel->info_mask_shared_by_all |=
> +				BIT(IIO_CHAN_INFO_SCALE);
> +		}
>  		channel->info_mask_separate =
> -			BIT(IIO_CHAN_INFO_PROCESSED) |
> +			BIT(IIO_CHAN_INFO_RAW) |
>  			BIT(IIO_CHAN_INFO_CALIBBIAS) |
>  			BIT(IIO_CHAN_INFO_CALIBSCALE);
> +		channel->modified = 1;
> +		channel->channel2 = IIO_MOD_LIGHT_CLEAR;
>  		break;
>  	case MOTIONSENSE_TYPE_PROX:
>  		channel->type = IIO_PROXIMITY;
> @@ -223,20 +525,48 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
>  		dev_warn(dev, "Unknown motion sensor\n");
>  		return -EINVAL;
>  	}
> +	channel++;
> +
> +	if (num_channels > CROS_EC_LIGHT_PROX_MIN_CHANNELS) {
> +		u8 sensor_num = state->core.param.info.sensor_num;
> +		int idx;
> +
> +		for (i = CROS_EC_SENSOR_X, idx = 1; i < CROS_EC_SENSOR_MAX_AXIS;
> +				i++, channel++, idx++) {
> +			cros_ec_light_channel_common(channel);
> +			channel->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
> +			channel->scan_index = idx;
> +			channel->modified = 1;
> +			channel->channel2 = IIO_MOD_X + i;
> +			channel->type = IIO_LIGHT;
> +		}
> +		for (i = CROS_EC_SENSOR_X; i < CROS_EC_SENSOR_MAX_AXIS;
> +				i++, channel++, idx++) {
> +			cros_ec_light_channel_common(channel);
> +			channel->info_mask_separate =
> +				BIT(IIO_CHAN_INFO_RAW) |
> +				BIT(IIO_CHAN_INFO_CALIBBIAS) |
> +				BIT(IIO_CHAN_INFO_CALIBSCALE);
> +			channel->scan_index = idx;
> +			channel->modified = 1;
> +			channel->channel2 = IIO_MOD_LIGHT_RED + i;
> +			channel->type = IIO_LIGHT;
> +		}
> +		cros_ec_sensorhub_register_push_data(
> +				sensor_hub,
> +				sensor_num + 1,
> +				indio_dev,
> +				cros_ec_light_push_data_rgb);
> +	}
>  
>  	/* Timestamp */
> -	channel++;
>  	channel->type = IIO_TIMESTAMP;
>  	channel->channel = -1;
> -	channel->scan_index = 1;
> +	channel->scan_index = num_channels - 1;
>  	channel->scan_type.sign = 's';
>  	channel->scan_type.realbits = 64;
>  	channel->scan_type.storagebits = 64;
>  
> -	indio_dev->channels = state->channels;
> -
> -	indio_dev->num_channels = CROS_EC_LIGHT_PROX_MAX_CHANNELS;
> -
>  	state->core.read_ec_sensors_data = cros_ec_sensors_read_cmd;
>  
>  	return devm_iio_device_register(dev, indio_dev);
> diff --git a/drivers/platform/chrome/cros_ec_sensorhub.c b/drivers/platform/chrome/cros_ec_sensorhub.c
> index b7f2c00db5e1e..f85191ab2ee34 100644
> --- a/drivers/platform/chrome/cros_ec_sensorhub.c
> +++ b/drivers/platform/chrome/cros_ec_sensorhub.c
> @@ -103,6 +103,9 @@ static int cros_ec_sensorhub_register(struct device *dev,
>  		case MOTIONSENSE_TYPE_LIGHT:
>  			name = "cros-ec-light";
>  			break;
> +		case MOTIONSENSE_TYPE_LIGHT_RGB:
> +			/* Processed with cros-ec-light. */
> +			continue;
>  		case MOTIONSENSE_TYPE_ACTIVITY:
>  			name = "cros-ec-activity";
>  			break;
> diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
> index 7bc961defa87e..c31766c64bf94 100644
> --- a/include/linux/iio/common/cros_ec_sensors_core.h
> +++ b/include/linux/iio/common/cros_ec_sensors_core.h
> @@ -26,7 +26,6 @@ enum {
>  
>  /*
>   * 4 16 bit channels are allowed.
> - * Good enough for current sensors, they use up to 3 16 bit vectors.
>   */
>  #define CROS_EC_SAMPLE_SIZE  (sizeof(s64) * 2)
>  
> diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
> index 3286ac00b0436..72ee6b049da62 100644
> --- a/include/linux/platform_data/cros_ec_commands.h
> +++ b/include/linux/platform_data/cros_ec_commands.h
> @@ -2342,6 +2342,7 @@ enum motionsensor_type {
>  	MOTIONSENSE_TYPE_ACTIVITY = 5,
>  	MOTIONSENSE_TYPE_BARO = 6,
>  	MOTIONSENSE_TYPE_SYNC = 7,
> +	MOTIONSENSE_TYPE_LIGHT_RGB = 8,
>  	MOTIONSENSE_TYPE_MAX,
>  };
>  
> @@ -2375,6 +2376,7 @@ enum motionsensor_chip {
>  	MOTIONSENSE_CHIP_LSM6DS3 = 17,
>  	MOTIONSENSE_CHIP_LSM6DSO = 18,
>  	MOTIONSENSE_CHIP_LNG2DM = 19,
> +	MOTIONSENSE_CHIP_TCS3400 = 20,
>  	MOTIONSENSE_CHIP_MAX,
>  };
>  
> 

-- 

Peter Meerwald-Stadler
Mobile: +43 664 24 44 418