[PATCH v2 0/3] Add support of color temperature and chromaticity

[PATCH v2 0/3] Add support of color temperature and chromaticity

[Srinivas Pandruvada]

The original series submitted to 6.7 (before revert) is modified to
solve regression issues on several platforms. There is one change
introduced before adding support for new features to allow dynamic
addition of channels.

This series is for the kernel version 6.8+.

v2:
New change to add channels dynamically
Modified color temperature and chromaticity to skip in case
of failures

Basavaraj Natikar (2):
  iio: hid-sensor-als: Add light color temperature support
  iio: hid-sensor-als: Add light chromaticity support

Srinivas Pandruvada (1):
  iio: hid-sensor-als: Allocate channels dynamically

 drivers/iio/light/hid-sensor-als.c | 164 ++++++++++++++++++++++++-----
 include/linux/hid-sensor-ids.h     |   4 +
 2 files changed, 144 insertions(+), 24 deletions(-)

-- 
2.43.0

[PATCH v2 1/3] iio: hid-sensor-als: Allocate channels dynamically

[Srinivas Pandruvada]

Instead of assuming that every channel defined statically by
als_channels[] is present, allocate dynamically based on presence of the
respective usage id in the descriptor. This will allow to register ALS
with limited channel support. Append the timestamp as the last channel.

There is no intentional function changes done.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
v2:
New change

 drivers/iio/light/hid-sensor-als.c | 57 ++++++++++++++++++------------
 1 file changed, 35 insertions(+), 22 deletions(-)

diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c
index 5cd27f04b45e..e57ad1946b56 100644
--- a/drivers/iio/light/hid-sensor-als.c
+++ b/drivers/iio/light/hid-sensor-als.c
@@ -236,14 +236,21 @@ static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
 
 /* Parse report which is specific to an usage id*/
 static int als_parse_report(struct platform_device *pdev,
-				struct hid_sensor_hub_device *hsdev,
-				struct iio_chan_spec *channels,
-				unsigned usage_id,
-				struct als_state *st)
+			    struct hid_sensor_hub_device *hsdev,
+			    struct iio_chan_spec **channels_out,
+			    int *size_channels_out,
+			    unsigned int usage_id,
+			    struct als_state *st)
 {
-	int ret;
+	struct iio_chan_spec *channels;
+	int ret, index = 0;
 	int i;
 
+	channels = devm_kcalloc(&pdev->dev, ARRAY_SIZE(als_channels),
+				sizeof(als_channels), GFP_KERNEL);
+	if (!channels)
+		return -ENOMEM;
+
 	for (i = 0; i <= CHANNEL_SCAN_INDEX_ILLUM; ++i) {
 		ret = sensor_hub_input_get_attribute_info(hsdev,
 						HID_INPUT_REPORT,
@@ -251,9 +258,11 @@ static int als_parse_report(struct platform_device *pdev,
 						HID_USAGE_SENSOR_LIGHT_ILLUM,
 						&st->als[i]);
 		if (ret < 0)
-			return ret;
-		als_adjust_channel_bit_mask(channels, i, st->als[i].size);
+			break;
 
+		channels[i] = als_channels[i];
+		als_adjust_channel_bit_mask(channels, i, st->als[i].size);
+		++index;
 		dev_dbg(&pdev->dev, "als %x:%x\n", st->als[i].index,
 			st->als[i].report_id);
 	}
@@ -262,17 +271,24 @@ static int als_parse_report(struct platform_device *pdev,
 				&st->als[CHANNEL_SCAN_INDEX_INTENSITY],
 				&st->scale_pre_decml, &st->scale_post_decml);
 
-	return ret;
+	*channels_out = channels;
+	*size_channels_out = index;
+
+	if (!index)
+		ret = -ENODEV;
+
+	return 0;
 }
 
 /* Function to initialize the processing for usage id */
 static int hid_als_probe(struct platform_device *pdev)
 {
-	int ret = 0;
+	int ret = 0, max_channel_index;
 	static const char *name = "als";
 	struct iio_dev *indio_dev;
 	struct als_state *als_state;
 	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
+	struct iio_chan_spec *channels;
 
 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
 	if (!indio_dev)
@@ -293,24 +309,21 @@ static int hid_als_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	indio_dev->channels = devm_kmemdup(&pdev->dev, als_channels,
-					   sizeof(als_channels), GFP_KERNEL);
-	if (!indio_dev->channels) {
-		dev_err(&pdev->dev, "failed to duplicate channels\n");
-		return -ENOMEM;
-	}
-
-	ret = als_parse_report(pdev, hsdev,
-			       (struct iio_chan_spec *)indio_dev->channels,
-			       hsdev->usage,
-			       als_state);
+	ret = als_parse_report(pdev, hsdev, &channels, &max_channel_index,
+			       hsdev->usage, als_state);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to setup attributes\n");
 		return ret;
 	}
 
-	indio_dev->num_channels =
-				ARRAY_SIZE(als_channels);
+	/* Add timestamp channel */
+	channels[max_channel_index] = als_channels[CHANNEL_SCAN_INDEX_TIMESTAMP];
+	channels[max_channel_index].scan_index = max_channel_index;
+
+	/* +1 for adding timestamp channel */
+	indio_dev->num_channels = max_channel_index + 1;
+
+	indio_dev->channels = channels;
 	indio_dev->info = &als_info;
 	indio_dev->name = name;
 	indio_dev->modes = INDIO_DIRECT_MODE;
-- 
2.43.0

[PATCH v2 2/3] iio: hid-sensor-als: Add light color temperature support

[Srinivas Pandruvada]

From: Basavaraj Natikar <Basavaraj.Natikar@amd.com>

In most cases, ambient color sensors also support light color temperature.
As a result, add support of light color temperature.

Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
v2:
Original patch from Basavaraj Natikar <Basavaraj.Natikar@amd.com> is
modified to prevent failure when the new usage id is not found in the
descriptor.

 drivers/iio/light/hid-sensor-als.c | 41 ++++++++++++++++++++++++++++--
 include/linux/hid-sensor-ids.h     |  1 +
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c
index e57ad1946b56..8d6beacc338a 100644
--- a/drivers/iio/light/hid-sensor-als.c
+++ b/drivers/iio/light/hid-sensor-als.c
@@ -14,8 +14,9 @@
 #include "../common/hid-sensors/hid-sensor-trigger.h"
 
 enum {
-	CHANNEL_SCAN_INDEX_INTENSITY = 0,
-	CHANNEL_SCAN_INDEX_ILLUM = 1,
+	CHANNEL_SCAN_INDEX_INTENSITY,
+	CHANNEL_SCAN_INDEX_ILLUM,
+	CHANNEL_SCAN_INDEX_COLOR_TEMP,
 	CHANNEL_SCAN_INDEX_MAX
 };
 
@@ -65,6 +66,16 @@ static const struct iio_chan_spec als_channels[] = {
 		BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
 		.scan_index = CHANNEL_SCAN_INDEX_ILLUM,
 	},
+	{
+		.type = IIO_COLORTEMP,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		BIT(IIO_CHAN_INFO_SCALE) |
+		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+		BIT(IIO_CHAN_INFO_HYSTERESIS) |
+		BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
+		.scan_index = CHANNEL_SCAN_INDEX_COLOR_TEMP,
+	},
 	IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
 };
 
@@ -103,6 +114,11 @@ static int als_read_raw(struct iio_dev *indio_dev,
 			min = als_state->als[chan->scan_index].logical_minimum;
 			address = HID_USAGE_SENSOR_LIGHT_ILLUM;
 			break;
+		case  CHANNEL_SCAN_INDEX_COLOR_TEMP:
+			report_id = als_state->als[chan->scan_index].report_id;
+			min = als_state->als[chan->scan_index].logical_minimum;
+			address = HID_USAGE_SENSOR_LIGHT_COLOR_TEMPERATURE;
+			break;
 		default:
 			report_id = -1;
 			break;
@@ -223,6 +239,10 @@ static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
 		als_state->scan.illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_data;
 		ret = 0;
 		break;
+	case HID_USAGE_SENSOR_LIGHT_COLOR_TEMPERATURE:
+		als_state->scan.illum[CHANNEL_SCAN_INDEX_COLOR_TEMP] = sample_data;
+		ret = 0;
+		break;
 	case HID_USAGE_SENSOR_TIME_TIMESTAMP:
 		als_state->timestamp = hid_sensor_convert_timestamp(&als_state->common_attributes,
 								    *(s64 *)raw_data);
@@ -267,10 +287,27 @@ static int als_parse_report(struct platform_device *pdev,
 			st->als[i].report_id);
 	}
 
+	ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
+				usage_id,
+				HID_USAGE_SENSOR_LIGHT_COLOR_TEMPERATURE,
+				&st->als[CHANNEL_SCAN_INDEX_COLOR_TEMP]);
+	if (ret < 0)
+		goto skip_temp_channel;
+
+	channels[index++] = als_channels[CHANNEL_SCAN_INDEX_COLOR_TEMP];
+
+	als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_COLOR_TEMP,
+				st->als[CHANNEL_SCAN_INDEX_COLOR_TEMP].size);
+
+	dev_dbg(&pdev->dev, "als %x:%x\n",
+		st->als[CHANNEL_SCAN_INDEX_COLOR_TEMP].index,
+		st->als[CHANNEL_SCAN_INDEX_COLOR_TEMP].report_id);
+
 	st->scale_precision = hid_sensor_format_scale(usage_id,
 				&st->als[CHANNEL_SCAN_INDEX_INTENSITY],
 				&st->scale_pre_decml, &st->scale_post_decml);
 
+skip_temp_channel:
 	*channels_out = channels;
 	*size_channels_out = index;
 
diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
index 13b1e65fbdcc..8af4fb3e0254 100644
--- a/include/linux/hid-sensor-ids.h
+++ b/include/linux/hid-sensor-ids.h
@@ -21,6 +21,7 @@
 #define HID_USAGE_SENSOR_ALS					0x200041
 #define HID_USAGE_SENSOR_DATA_LIGHT				0x2004d0
 #define HID_USAGE_SENSOR_LIGHT_ILLUM				0x2004d1
+#define HID_USAGE_SENSOR_LIGHT_COLOR_TEMPERATURE		0x2004d2
 
 /* PROX (200011) */
 #define HID_USAGE_SENSOR_PROX                                   0x200011
-- 
2.43.0

[PATCH v2 3/3] iio: hid-sensor-als: Add light chromaticity support

[Srinivas Pandruvada]

From: Basavaraj Natikar <Basavaraj.Natikar@amd.com>

In most cases, ambient color sensors also support the x and y light
colors, which represent the coordinates on the CIE 1931 chromaticity
diagram. Thus, add light chromaticity x and y.

Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
v2:
Original patch from Basavaraj Natikar <Basavaraj.Natikar@amd.com> is
modified to prevent failure when the new usage id is not found in the
descriptor.

 drivers/iio/light/hid-sensor-als.c | 68 +++++++++++++++++++++++++++++-
 include/linux/hid-sensor-ids.h     |  3 ++
 2 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c
index 8d6beacc338a..6e2793fa515c 100644
--- a/drivers/iio/light/hid-sensor-als.c
+++ b/drivers/iio/light/hid-sensor-als.c
@@ -17,6 +17,8 @@ enum {
 	CHANNEL_SCAN_INDEX_INTENSITY,
 	CHANNEL_SCAN_INDEX_ILLUM,
 	CHANNEL_SCAN_INDEX_COLOR_TEMP,
+	CHANNEL_SCAN_INDEX_CHROMATICITY_X,
+	CHANNEL_SCAN_INDEX_CHROMATICITY_Y,
 	CHANNEL_SCAN_INDEX_MAX
 };
 
@@ -76,6 +78,30 @@ static const struct iio_chan_spec als_channels[] = {
 		BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
 		.scan_index = CHANNEL_SCAN_INDEX_COLOR_TEMP,
 	},
+	{
+		.type = IIO_CHROMATICITY,
+		.modified = 1,
+		.channel2 = IIO_MOD_X,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		BIT(IIO_CHAN_INFO_SCALE) |
+		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+		BIT(IIO_CHAN_INFO_HYSTERESIS) |
+		BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
+		.scan_index = CHANNEL_SCAN_INDEX_CHROMATICITY_X,
+	},
+	{
+		.type = IIO_CHROMATICITY,
+		.modified = 1,
+		.channel2 = IIO_MOD_Y,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+		BIT(IIO_CHAN_INFO_SCALE) |
+		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+		BIT(IIO_CHAN_INFO_HYSTERESIS) |
+		BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
+		.scan_index = CHANNEL_SCAN_INDEX_CHROMATICITY_Y,
+	},
 	IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
 };
 
@@ -119,6 +145,16 @@ static int als_read_raw(struct iio_dev *indio_dev,
 			min = als_state->als[chan->scan_index].logical_minimum;
 			address = HID_USAGE_SENSOR_LIGHT_COLOR_TEMPERATURE;
 			break;
+		case  CHANNEL_SCAN_INDEX_CHROMATICITY_X:
+			report_id = als_state->als[chan->scan_index].report_id;
+			min = als_state->als[chan->scan_index].logical_minimum;
+			address = HID_USAGE_SENSOR_LIGHT_CHROMATICITY_X;
+			break;
+		case  CHANNEL_SCAN_INDEX_CHROMATICITY_Y:
+			report_id = als_state->als[chan->scan_index].report_id;
+			min = als_state->als[chan->scan_index].logical_minimum;
+			address = HID_USAGE_SENSOR_LIGHT_CHROMATICITY_Y;
+			break;
 		default:
 			report_id = -1;
 			break;
@@ -243,6 +279,14 @@ static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
 		als_state->scan.illum[CHANNEL_SCAN_INDEX_COLOR_TEMP] = sample_data;
 		ret = 0;
 		break;
+	case HID_USAGE_SENSOR_LIGHT_CHROMATICITY_X:
+		als_state->scan.illum[CHANNEL_SCAN_INDEX_CHROMATICITY_X] = sample_data;
+		ret = 0;
+		break;
+	case HID_USAGE_SENSOR_LIGHT_CHROMATICITY_Y:
+		als_state->scan.illum[CHANNEL_SCAN_INDEX_CHROMATICITY_Y] = sample_data;
+		ret = 0;
+		break;
 	case HID_USAGE_SENSOR_TIME_TIMESTAMP:
 		als_state->timestamp = hid_sensor_convert_timestamp(&als_state->common_attributes,
 								    *(s64 *)raw_data);
@@ -303,11 +347,33 @@ static int als_parse_report(struct platform_device *pdev,
 		st->als[CHANNEL_SCAN_INDEX_COLOR_TEMP].index,
 		st->als[CHANNEL_SCAN_INDEX_COLOR_TEMP].report_id);
 
+skip_temp_channel:
+	for (i = 0; i < 2; i++) {
+		int next_scan_index = CHANNEL_SCAN_INDEX_CHROMATICITY_X + i;
+
+		ret = sensor_hub_input_get_attribute_info(hsdev,
+				HID_INPUT_REPORT, usage_id,
+				HID_USAGE_SENSOR_LIGHT_CHROMATICITY_X + i,
+				&st->als[next_scan_index]);
+		if (ret < 0)
+			goto skip_chromaticity_channel;
+
+		channels[index++] = als_channels[CHANNEL_SCAN_INDEX_CHROMATICITY_X + i];
+
+		als_adjust_channel_bit_mask(channels,
+					CHANNEL_SCAN_INDEX_CHROMATICITY_X + i,
+					st->als[next_scan_index].size);
+
+		dev_dbg(&pdev->dev, "als %x:%x\n",
+			st->als[next_scan_index].index,
+			st->als[next_scan_index].report_id);
+	}
+
 	st->scale_precision = hid_sensor_format_scale(usage_id,
 				&st->als[CHANNEL_SCAN_INDEX_INTENSITY],
 				&st->scale_pre_decml, &st->scale_post_decml);
 
-skip_temp_channel:
+skip_chromaticity_channel:
 	*channels_out = channels;
 	*size_channels_out = index;
 
diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
index 8af4fb3e0254..6730ee900ee1 100644
--- a/include/linux/hid-sensor-ids.h
+++ b/include/linux/hid-sensor-ids.h
@@ -22,6 +22,9 @@
 #define HID_USAGE_SENSOR_DATA_LIGHT				0x2004d0
 #define HID_USAGE_SENSOR_LIGHT_ILLUM				0x2004d1
 #define HID_USAGE_SENSOR_LIGHT_COLOR_TEMPERATURE		0x2004d2
+#define HID_USAGE_SENSOR_LIGHT_CHROMATICITY			0x2004d3
+#define HID_USAGE_SENSOR_LIGHT_CHROMATICITY_X			0x2004d4
+#define HID_USAGE_SENSOR_LIGHT_CHROMATICITY_Y			0x2004d5
 
 /* PROX (200011) */
 #define HID_USAGE_SENSOR_PROX                                   0x200011
-- 
2.43.0

Re: [PATCH v2 1/3] iio: hid-sensor-als: Allocate channels dynamically

[Jonathan Cameron]

On Mon, 18 Dec 2023 12:30:24 -0800
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> wrote:

> Instead of assuming that every channel defined statically by
> als_channels[] is present, allocate dynamically based on presence of the
> respective usage id in the descriptor. This will allow to register ALS
> with limited channel support. Append the timestamp as the last channel.
> 
> There is no intentional function changes done.
> 
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Hi Srinivas,

No huge rush on this as I'll not have the revert in my upstream now
until after the merge window + may not have a chance for a second pull
request anyway.

A few comments inline,

Jonathan

> ---
> v2:
> New change
> 
>  drivers/iio/light/hid-sensor-als.c | 57 ++++++++++++++++++------------
>  1 file changed, 35 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c
> index 5cd27f04b45e..e57ad1946b56 100644
> --- a/drivers/iio/light/hid-sensor-als.c
> +++ b/drivers/iio/light/hid-sensor-als.c
> @@ -236,14 +236,21 @@ static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
>  
>  /* Parse report which is specific to an usage id*/
>  static int als_parse_report(struct platform_device *pdev,
> -				struct hid_sensor_hub_device *hsdev,
> -				struct iio_chan_spec *channels,
> -				unsigned usage_id,
> -				struct als_state *st)
> +			    struct hid_sensor_hub_device *hsdev,
> +			    struct iio_chan_spec **channels_out,
> +			    int *size_channels_out,
> +			    unsigned int usage_id,
> +			    struct als_state *st)

Align with opening bracket.  Also, try in general to avoid white space changes
when changing anything else.  It would be easier to see what actually changed
here without that.

>  {
> -	int ret;
> +	struct iio_chan_spec *channels;
> +	int ret, index = 0;
>  	int i;
>  
> +	channels = devm_kcalloc(&pdev->dev, ARRAY_SIZE(als_channels),
> +				sizeof(als_channels), GFP_KERNEL);

Given it's a fixed size (which is fine even though you might not use it
all), can you just make it part of the iio_priv() structure
and avoid need for handling the allocation here?


> +	if (!channels)
> +		return -ENOMEM;
> +
>  	for (i = 0; i <= CHANNEL_SCAN_INDEX_ILLUM; ++i) {
>  		ret = sensor_hub_input_get_attribute_info(hsdev,
>  						HID_INPUT_REPORT,
> @@ -251,9 +258,11 @@ static int als_parse_report(struct platform_device *pdev,
>  						HID_USAGE_SENSOR_LIGHT_ILLUM,
>  						&st->als[i]);
>  		if (ret < 0)
> -			return ret;
> -		als_adjust_channel_bit_mask(channels, i, st->als[i].size);
> +			break;
>  
> +		channels[i] = als_channels[i];

channels[index] = als_channels[i]? Might be gaps. What you currently have
only works if the 'present channels' are all at the start.

> +		als_adjust_channel_bit_mask(channels, i, st->als[i].size);

Would use index not i.

> +		++index;
>  		dev_dbg(&pdev->dev, "als %x:%x\n", st->als[i].index,
>  			st->als[i].report_id);
>  	}
> @@ -262,17 +271,24 @@ static int als_parse_report(struct platform_device *pdev,
>  				&st->als[CHANNEL_SCAN_INDEX_INTENSITY],
>  				&st->scale_pre_decml, &st->scale_post_decml);
>  
> -	return ret;
> +	*channels_out = channels;
> +	*size_channels_out = index;
> +
> +	if (!index)
> +		ret = -ENODEV;
> +
> +	return 0;
>  }
>  
>  /* Function to initialize the processing for usage id */
>  static int hid_als_probe(struct platform_device *pdev)
>  {
> -	int ret = 0;
> +	int ret = 0, max_channel_index;
>  	static const char *name = "als";
>  	struct iio_dev *indio_dev;
>  	struct als_state *als_state;
>  	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
> +	struct iio_chan_spec *channels;
>  
>  	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
>  	if (!indio_dev)
> @@ -293,24 +309,21 @@ static int hid_als_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	indio_dev->channels = devm_kmemdup(&pdev->dev, als_channels,
> -					   sizeof(als_channels), GFP_KERNEL);
> -	if (!indio_dev->channels) {
> -		dev_err(&pdev->dev, "failed to duplicate channels\n");
> -		return -ENOMEM;
> -	}
> -
> -	ret = als_parse_report(pdev, hsdev,
> -			       (struct iio_chan_spec *)indio_dev->channels,
> -			       hsdev->usage,
> -			       als_state);
> +	ret = als_parse_report(pdev, hsdev, &channels, &max_channel_index,
> +			       hsdev->usage, als_state);
>  	if (ret) {
>  		dev_err(&pdev->dev, "failed to setup attributes\n");
>  		return ret;
>  	}
>  
> -	indio_dev->num_channels =
> -				ARRAY_SIZE(als_channels);
> +	/* Add timestamp channel */
> +	channels[max_channel_index] = als_channels[CHANNEL_SCAN_INDEX_TIMESTAMP];
> +	channels[max_channel_index].scan_index = max_channel_index;
> +
> +	/* +1 for adding timestamp channel */
> +	indio_dev->num_channels = max_channel_index + 1;
> +
> +	indio_dev->channels = channels;
>  	indio_dev->info = &als_info;
>  	indio_dev->name = name;
>  	indio_dev->modes = INDIO_DIRECT_MODE;

Re: [PATCH v2 3/3] iio: hid-sensor-als: Add light chromaticity support

[Jonathan Cameron]

On Mon, 18 Dec 2023 12:30:26 -0800
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> wrote:

> From: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
> 
> In most cases, ambient color sensors also support the x and y light
> colors, which represent the coordinates on the CIE 1931 chromaticity
> diagram. Thus, add light chromaticity x and y.
> 
> Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Is it not possible to unify the support to be a single pass over the
channels array that just checks each one for availability and copies
the channel in if is found?  Tweaked slightly to deal with
the pair of chromaticity channels.

Jonathan

> ---
> v2:
> Original patch from Basavaraj Natikar <Basavaraj.Natikar@amd.com> is
> modified to prevent failure when the new usage id is not found in the
> descriptor.
> 
>  drivers/iio/light/hid-sensor-als.c | 68 +++++++++++++++++++++++++++++-
>  include/linux/hid-sensor-ids.h     |  3 ++
>  2 files changed, 70 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c
> index 8d6beacc338a..6e2793fa515c 100644
> --- a/drivers/iio/light/hid-sensor-als.c
> +++ b/drivers/iio/light/hid-sensor-als.c
> @@ -17,6 +17,8 @@ enum {
>  	CHANNEL_SCAN_INDEX_INTENSITY,
>  	CHANNEL_SCAN_INDEX_ILLUM,
>  	CHANNEL_SCAN_INDEX_COLOR_TEMP,
> +	CHANNEL_SCAN_INDEX_CHROMATICITY_X,
> +	CHANNEL_SCAN_INDEX_CHROMATICITY_Y,
>  	CHANNEL_SCAN_INDEX_MAX
>  };
>  
> @@ -76,6 +78,30 @@ static const struct iio_chan_spec als_channels[] = {
>  		BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
>  		.scan_index = CHANNEL_SCAN_INDEX_COLOR_TEMP,
>  	},
> +	{
> +		.type = IIO_CHROMATICITY,
> +		.modified = 1,
> +		.channel2 = IIO_MOD_X,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> +		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
> +		BIT(IIO_CHAN_INFO_SCALE) |
> +		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> +		BIT(IIO_CHAN_INFO_HYSTERESIS) |
> +		BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
> +		.scan_index = CHANNEL_SCAN_INDEX_CHROMATICITY_X,
> +	},
> +	{
> +		.type = IIO_CHROMATICITY,
> +		.modified = 1,
> +		.channel2 = IIO_MOD_Y,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> +		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
> +		BIT(IIO_CHAN_INFO_SCALE) |
> +		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> +		BIT(IIO_CHAN_INFO_HYSTERESIS) |
> +		BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
> +		.scan_index = CHANNEL_SCAN_INDEX_CHROMATICITY_Y,
> +	},
>  	IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
>  };
>  
> @@ -119,6 +145,16 @@ static int als_read_raw(struct iio_dev *indio_dev,
>  			min = als_state->als[chan->scan_index].logical_minimum;
>  			address = HID_USAGE_SENSOR_LIGHT_COLOR_TEMPERATURE;
>  			break;
> +		case  CHANNEL_SCAN_INDEX_CHROMATICITY_X:
> +			report_id = als_state->als[chan->scan_index].report_id;
> +			min = als_state->als[chan->scan_index].logical_minimum;
> +			address = HID_USAGE_SENSOR_LIGHT_CHROMATICITY_X;
> +			break;
> +		case  CHANNEL_SCAN_INDEX_CHROMATICITY_Y:
> +			report_id = als_state->als[chan->scan_index].report_id;
> +			min = als_state->als[chan->scan_index].logical_minimum;
> +			address = HID_USAGE_SENSOR_LIGHT_CHROMATICITY_Y;
> +			break;
>  		default:
>  			report_id = -1;
>  			break;
> @@ -243,6 +279,14 @@ static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
>  		als_state->scan.illum[CHANNEL_SCAN_INDEX_COLOR_TEMP] = sample_data;
>  		ret = 0;
>  		break;
> +	case HID_USAGE_SENSOR_LIGHT_CHROMATICITY_X:
> +		als_state->scan.illum[CHANNEL_SCAN_INDEX_CHROMATICITY_X] = sample_data;
> +		ret = 0;
> +		break;
> +	case HID_USAGE_SENSOR_LIGHT_CHROMATICITY_Y:
> +		als_state->scan.illum[CHANNEL_SCAN_INDEX_CHROMATICITY_Y] = sample_data;
> +		ret = 0;
> +		break;
>  	case HID_USAGE_SENSOR_TIME_TIMESTAMP:
>  		als_state->timestamp = hid_sensor_convert_timestamp(&als_state->common_attributes,
>  								    *(s64 *)raw_data);
> @@ -303,11 +347,33 @@ static int als_parse_report(struct platform_device *pdev,
>  		st->als[CHANNEL_SCAN_INDEX_COLOR_TEMP].index,
>  		st->als[CHANNEL_SCAN_INDEX_COLOR_TEMP].report_id);
>  
> +skip_temp_channel:
> +	for (i = 0; i < 2; i++) {
> +		int next_scan_index = CHANNEL_SCAN_INDEX_CHROMATICITY_X + i;
> +
> +		ret = sensor_hub_input_get_attribute_info(hsdev,
> +				HID_INPUT_REPORT, usage_id,
> +				HID_USAGE_SENSOR_LIGHT_CHROMATICITY_X + i,
> +				&st->als[next_scan_index]);
> +		if (ret < 0)
> +			goto skip_chromaticity_channel;
> +
> +		channels[index++] = als_channels[CHANNEL_SCAN_INDEX_CHROMATICITY_X + i];
> +
> +		als_adjust_channel_bit_mask(channels,
> +					CHANNEL_SCAN_INDEX_CHROMATICITY_X + i,
> +					st->als[next_scan_index].size);
> +
> +		dev_dbg(&pdev->dev, "als %x:%x\n",
> +			st->als[next_scan_index].index,
> +			st->als[next_scan_index].report_id);
> +	}
> +
>  	st->scale_precision = hid_sensor_format_scale(usage_id,
>  				&st->als[CHANNEL_SCAN_INDEX_INTENSITY],
>  				&st->scale_pre_decml, &st->scale_post_decml);
>  
> -skip_temp_channel:
> +skip_chromaticity_channel:
>  	*channels_out = channels;
>  	*size_channels_out = index;
>  
> diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
> index 8af4fb3e0254..6730ee900ee1 100644
> --- a/include/linux/hid-sensor-ids.h
> +++ b/include/linux/hid-sensor-ids.h
> @@ -22,6 +22,9 @@
>  #define HID_USAGE_SENSOR_DATA_LIGHT				0x2004d0
>  #define HID_USAGE_SENSOR_LIGHT_ILLUM				0x2004d1
>  #define HID_USAGE_SENSOR_LIGHT_COLOR_TEMPERATURE		0x2004d2
> +#define HID_USAGE_SENSOR_LIGHT_CHROMATICITY			0x2004d3
> +#define HID_USAGE_SENSOR_LIGHT_CHROMATICITY_X			0x2004d4
> +#define HID_USAGE_SENSOR_LIGHT_CHROMATICITY_Y			0x2004d5
>  
>  /* PROX (200011) */
>  #define HID_USAGE_SENSOR_PROX                                   0x200011