iio: ltr501: Add light channel support (c06cee8d) · Commits · 戴 / test

drivers/iio/light/ltr501.c

+51 −0

Original line number	Diff line number	Diff line
		@@ -66,6 +66,9 @@

		#define LTR501_REGMAP_NAME "ltr501_regmap"

		#define LTR501_LUX_CONV(vis_coeff, vis_data, ir_coeff, ir_data) \
		((vis_coeff * vis_data) - (ir_coeff * ir_data))

		static const int int_time_mapping[] = {100000, 50000, 200000, 400000};

		static const struct reg_field reg_field_it =
		@@ -298,6 +301,29 @@ static int ltr501_ps_read_samp_period(struct ltr501_data data, int val)
		return IIO_VAL_INT;
		}

		/* IR and visible spectrum coeff's are given in data sheet */
		static unsigned long ltr501_calculate_lux(u16 vis_data, u16 ir_data)
		{
		unsigned long ratio, lux;

		if (vis_data == 0)
		return 0;

		/* multiply numerator by 100 to avoid handling ratio < 1 */
		ratio = DIV_ROUND_UP(ir_data * 100, ir_data + vis_data);

		if (ratio < 45)
		lux = LTR501_LUX_CONV(1774, vis_data, -1105, ir_data);
		else if (ratio >= 45 && ratio < 64)
		lux = LTR501_LUX_CONV(3772, vis_data, 1336, ir_data);
		else if (ratio >= 64 && ratio < 85)
		lux = LTR501_LUX_CONV(1690, vis_data, 169, ir_data);
		else
		lux = 0;

		return lux / 1000;
		}

		static int ltr501_drdy(struct ltr501_data *data, u8 drdy_mask)
		{
		int tries = 100;
		@@ -548,7 +574,14 @@ static const struct iio_event_spec ltr501_pxs_event_spec[] = {
		.num_event_specs = _evsize,\
		}

		#define LTR501_LIGHT_CHANNEL() { \
		.type = IIO_LIGHT, \
		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
		.scan_index = -1, \
		}

		static const struct iio_chan_spec ltr501_channels[] = {
		LTR501_LIGHT_CHANNEL(),
		LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
		ltr501_als_event_spec,
		ARRAY_SIZE(ltr501_als_event_spec)),
		@@ -576,6 +609,7 @@ static const struct iio_chan_spec ltr501_channels[] = {
		};

		static const struct iio_chan_spec ltr301_channels[] = {
		LTR501_LIGHT_CHANNEL(),
		LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
		ltr501_als_event_spec,
		ARRAY_SIZE(ltr501_als_event_spec)),
		@@ -596,6 +630,23 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
		int ret, i;

		switch (mask) {
		case IIO_CHAN_INFO_PROCESSED:
		if (iio_buffer_enabled(indio_dev))
		return -EBUSY;

		switch (chan->type) {
		case IIO_LIGHT:
		mutex_lock(&data->lock_als);
		ret = ltr501_read_als(data, buf);
		mutex_unlock(&data->lock_als);
		if (ret < 0)
		return ret;
		*val = ltr501_calculate_lux(le16_to_cpu(buf[1]),
		le16_to_cpu(buf[0]));
		return IIO_VAL_INT;
		default:
		return -EINVAL;
		}
		case IIO_CHAN_INFO_RAW:
		if (iio_buffer_enabled(indio_dev))
		return -EBUSY;

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