Re: [PATCH v3 3/4] iio: hid-sensor-als: Add light color temperature support

[Basavaraj Natikar <bnatikar@amd.com>]

Hi Srinivas,


On 1/9/2024 11:30 PM, Srinivas Pandruvada wrote:
> From: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
>
> On some platforms, ambient color sensors also support light color
> temperature. 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>
> ---
>
> I don't have a system to test this patch.
> Hi Basavraj,
> Please test.

After fixing both comments in patch 1 all works fine.

Thanks,
--
Basavaraj

>
> v3:
> Simplilified as no special processing is required in als_parse_report()
> 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 | 22 ++++++++++++++++++++++
>  include/linux/hid-sensor-ids.h     |  1 +
>  2 files changed, 23 insertions(+)
>
> diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c
> index a7bde6b68102..0d54eb59e47d 100644
> --- a/drivers/iio/light/hid-sensor-als.c
> +++ b/drivers/iio/light/hid-sensor-als.c
> @@ -16,6 +16,7 @@
>  enum {
>  	CHANNEL_SCAN_INDEX_INTENSITY,
>  	CHANNEL_SCAN_INDEX_ILLUM,
> +	CHANNEL_SCAN_INDEX_COLOR_TEMP,
>  	CHANNEL_SCAN_INDEX_MAX
>  };
>  
> @@ -43,6 +44,7 @@ struct als_state {
>  static const u32 als_usage_ids[] = {
>  	HID_USAGE_SENSOR_LIGHT_ILLUM,
>  	HID_USAGE_SENSOR_LIGHT_ILLUM,
> +	HID_USAGE_SENSOR_LIGHT_COLOR_TEMPERATURE,
>  };
>  
>  static const u32 als_sensitivity_addresses[] = {
> @@ -74,6 +76,16 @@ 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)
>  };
>  
> @@ -112,6 +124,11 @@ 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;
> @@ -235,6 +252,11 @@ static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
>  		als_state->scan.illum[scan_index] = sample_data;
>  		ret = 0;
>  		break;
> +	case HID_USAGE_SENSOR_LIGHT_COLOR_TEMPERATURE:
> +		scan_index = als_state->scan.scan_index[CHANNEL_SCAN_INDEX_COLOR_TEMP];
> +		als_state->scan.illum[scan_index] = 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);
> 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