Message-ID: <20200508162347.00004b49@Huawei.com>
Date:   Fri, 8 May 2020 16:23:47 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Gwendal Grignou <gwendal@...omium.org>
CC:     <enric.balletbo@...labora.com>, <jic23@...nel.org>,
        <bleung@...omium.org>, <groeck@...omium.org>,
        <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] iio: cros_ec_light: Add support for RGB sensor

On Wed, 6 May 2020 16:03:24 -0700
Gwendal Grignou <gwendal@...omium.org> wrote:

> 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.

This seems like a misunderstanding...
If that channel is measuring normal illuminance value via an
appropriate sensor with filters to approximate the human eye
(which is what good ambient light sensors do) then it
should stay as in_illuminance_input / raw (depending only on whether
we have a scale to apply in userspace).

If it is a random clear signal as you tend to get on rgbc sensors
which is not intended to be used on its own and hence does not have
appropriate filters, then it is not an illuminance sensor but
is just measuring some sort of 'intensity'.

>From the earliest days of IIO we've dealt with those by using
in_intensity_clear_raw

That has no defined units because they are meaningless without
a very careful definition of 'clear'.

Earlier in the series I've suggested we 'might' abuse
the illuminance measure for XYZ as it's well defined. RGBC are
not so should stay as intensity channels.

> 
> Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
> ---
>  drivers/iio/light/cros_ec_light_prox.c        | 469 +++++++++++++++---
>  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, 404 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..83bd3057b334c 100644
> --- a/drivers/iio/light/cros_ec_light_prox.c
> +++ b/drivers/iio/light/cros_ec_light_prox.c
> @@ -17,82 +17,188 @@
>  #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 GENMASK(0, 0)
> +#define CROS_EC_LIGHT_XYZ_SPACE_MASK GENMASK(3, 1)
> +#define CROS_EC_LIGHT_RGB_SPACE_MASK (6, 4)
> +
> +/*
> + * 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,
> +	0,
> +};
> +
> +#define CROS_EC_LIGHT_IDX_TO_CHAN(_idx) (((_idx) - 1) % CROS_EC_SENSOR_MAX_AXIS)
>  
>  /* 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 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);
> +	channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> +	channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> +	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_LIGHT_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_LIGHT_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;
>  	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];
> +			i = CROS_EC_LIGHT_IDX_TO_CHAN(idx);
> +			*val = st->rgb_calib[i].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 +227,85 @@ 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_LIGHT_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 {
> +			i = CROS_EC_LIGHT_IDX_TO_CHAN(idx);
> +			st->rgb_calib[i].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 +321,154 @@ 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 (!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 (!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_LIGHT_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 +478,40 @@ 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 +524,48 @@ 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 395c9b2b05c66..e8b51e112c191 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,
>  };
>  

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