Commit 8592a7ee authored by Daniel Baluta's avatar Daniel Baluta Committed by Jonathan Cameron
Browse files

iio: ltr501: Add support for ltr559 chip 

This device is register compatible with LTR501, with a minor difference for
ALS control register as showed below:

ALS Control register for LTR501:

    7      6      5      4      3      2      1      0
+------+------+------+------+------+------+------+------+
|                           |      |      |             |
|        Reserved           | Gain |  SW  |    ALS Mode |
|                           |      | Reset|             |
+------+------+------+------+------+------+------+------+

ALS Control register for LTR559:

    7      6      5      4      3      2      1      0
+------+------+------+------+------+------+------+------+
|                    |                    |      |      |
|     Reserved       |        Gain        |  SW  | ALS  |
|                    |                    | Reset| Mode |
+------+------+------+------+------+------+------+------+

We handle this difference by introducing ltr501_chip_info.

Datasheet for LTR559 is at:
http://optoelectronics.liteon.com/upload/download/DS86-2013-0003/S_110_LTR-559ALS-01_DS_V1.pdf



Signed-off-by: default avatarDaniel Baluta <daniel.baluta@intel.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 772154d0

drivers/iio/light/Kconfig

+2 −1
Original line number Diff line number Diff line
@@ -169,7 +169,8 @@ config LTR501 
	select IIO_TRIGGERED_BUFFER

	help

	 If you say yes here you get support for the Lite-On LTR-501ALS-01

	 ambient light and proximity sensor.

	 ambient light and proximity sensor. This driver also supports LTR-559

	 ALS/PS sensor.



	 This driver can also be built as a module.  If so, the module

         will be called ltr501.

drivers/iio/light/ltr501.c

+184 −34
Original line number Diff line number Diff line
@@ -88,9 +88,63 @@ struct ltr501_samp_table { 
	int time_val; /* repetition rate in micro seconds */

};



#define LTR501_RESERVED_GAIN -1



enum {

	ltr501 = 0,

	ltr559,

};



struct ltr501_gain {

	int scale;

	int uscale;

};



static struct ltr501_gain ltr501_als_gain_tbl[] = {

	{1, 0},

	{0, 5000},

};



static struct ltr501_gain ltr559_als_gain_tbl[] = {

	{1, 0},

	{0, 500000},

	{0, 250000},

	{0, 125000},

	{LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},

	{LTR501_RESERVED_GAIN, LTR501_RESERVED_GAIN},

	{0, 20000},

	{0, 10000},

};



static struct ltr501_gain ltr501_ps_gain_tbl[] = {

	{1, 0},

	{0, 250000},

	{0, 125000},

	{0, 62500},

};



static struct ltr501_gain ltr559_ps_gain_tbl[] = {

	{0, 62500}, /* x16 gain */

	{0, 31250}, /* x32 gain */

	{0, 15625}, /* bits X1 are for x64 gain */

	{0, 15624},

};



struct ltr501_chip_info {

	u8 partid;

	struct ltr501_gain *als_gain;

	int als_gain_tbl_size;

	struct ltr501_gain *ps_gain;

	int ps_gain_tbl_size;

	u8 als_mode_active;

	u8 als_gain_mask;

	u8 als_gain_shift;

};



struct ltr501_data {

	struct i2c_client *client;

	struct mutex lock_als, lock_ps;

	struct ltr501_chip_info *chip_info;

	u8 als_contr, ps_contr;

	int als_period, ps_period; /* period in micro seconds */

	struct regmap *regmap;
@@ -516,10 +570,6 @@ static const struct iio_chan_spec ltr501_channels[] = { 
	IIO_CHAN_SOFT_TIMESTAMP(3),

};



static const int ltr501_ps_gain[4][2] = {

	{1, 0}, {0, 250000}, {0, 125000}, {0, 62500}

};



static int ltr501_read_raw(struct iio_dev *indio_dev,

			   struct iio_chan_spec const *chan,

			   int *val, int *val2, long mask)
@@ -557,19 +607,16 @@ static int ltr501_read_raw(struct iio_dev *indio_dev, 
	case IIO_CHAN_INFO_SCALE:

		switch (chan->type) {

		case IIO_INTENSITY:

			if (data->als_contr & LTR501_CONTR_ALS_GAIN_MASK) {

				*val = 0;

				*val2 = 5000;

			i = (data->als_contr & data->chip_info->als_gain_mask)

			     >> data->chip_info->als_gain_shift;

			*val = data->chip_info->als_gain[i].scale;

			*val2 = data->chip_info->als_gain[i].uscale;

			return IIO_VAL_INT_PLUS_MICRO;

			}

			*val = 1;

			*val2 = 0;

			return IIO_VAL_INT;

		case IIO_PROXIMITY:

			i = (data->ps_contr & LTR501_CONTR_PS_GAIN_MASK) >>

				LTR501_CONTR_PS_GAIN_SHIFT;

			*val = ltr501_ps_gain[i][0];

			*val2 = ltr501_ps_gain[i][1];

			*val = data->chip_info->ps_gain[i].scale;

			*val2 = data->chip_info->ps_gain[i].uscale;

			return IIO_VAL_INT_PLUS_MICRO;

		default:

			return -EINVAL;
@@ -594,12 +641,13 @@ static int ltr501_read_raw(struct iio_dev *indio_dev, 
	return -EINVAL;

}



static int ltr501_get_ps_gain_index(int val, int val2)

static int ltr501_get_gain_index(struct ltr501_gain *gain, int size,

				 int val, int val2)

{

	int i;



	for (i = 0; i < ARRAY_SIZE(ltr501_ps_gain); i++)

		if (val == ltr501_ps_gain[i][0] && val2 == ltr501_ps_gain[i][1])

	for (i = 0; i < size; i++)

		if (val == gain[i].scale && val2 == gain[i].uscale)

			return i;



	return -1;
@@ -611,6 +659,7 @@ static int ltr501_write_raw(struct iio_dev *indio_dev, 
{

	struct ltr501_data *data = iio_priv(indio_dev);

	int i, ret, freq_val, freq_val2;

	struct ltr501_chip_info *info = data->chip_info;



	if (iio_buffer_enabled(indio_dev))

		return -EBUSY;
@@ -619,17 +668,21 @@ static int ltr501_write_raw(struct iio_dev *indio_dev, 
	case IIO_CHAN_INFO_SCALE:

		switch (chan->type) {

		case IIO_INTENSITY:

			if (val == 0 && val2 == 5000)

				data->als_contr |= LTR501_CONTR_ALS_GAIN_MASK;

			else if (val == 1 && val2 == 0)

				data->als_contr &= ~LTR501_CONTR_ALS_GAIN_MASK;

			else

			i = ltr501_get_gain_index(info->als_gain,

						  info->als_gain_tbl_size,

						  val, val2);

			if (i < 0)

				return -EINVAL;



			data->als_contr &= ~info->als_gain_mask;

			data->als_contr |= i << info->als_gain_shift;



			return regmap_write(data->regmap, LTR501_ALS_CONTR,

					    data->als_contr);

		case IIO_PROXIMITY:

			i = ltr501_get_ps_gain_index(val, val2);

			i = ltr501_get_gain_index(info->ps_gain,

						  info->ps_gain_tbl_size,

						  val, val2);

			if (i < 0)

				return -EINVAL;

			data->ps_contr &= ~LTR501_CONTR_PS_GAIN_MASK;
@@ -927,14 +980,61 @@ static int ltr501_write_event_config(struct iio_dev *indio_dev, 
	return -EINVAL;

}



static IIO_CONST_ATTR(in_proximity_scale_available, "1 0.25 0.125 0.0625");

static IIO_CONST_ATTR(in_intensity_scale_available, "1 0.005");

static ssize_t ltr501_show_proximity_scale_avail(struct device *dev,

						 struct device_attribute *attr,

						 char *buf)

{

	struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));

	struct ltr501_chip_info *info = data->chip_info;

	ssize_t len = 0;

	int i;



	for (i = 0; i < info->ps_gain_tbl_size; i++) {

		if (info->ps_gain[i].scale == LTR501_RESERVED_GAIN)

			continue;

		len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",

				 info->ps_gain[i].scale,

				 info->ps_gain[i].uscale);

	}



	buf[len - 1] = '\n';



	return len;

}



static ssize_t ltr501_show_intensity_scale_avail(struct device *dev,

						 struct device_attribute *attr,

						 char *buf)

{

	struct ltr501_data *data = iio_priv(dev_to_iio_dev(dev));

	struct ltr501_chip_info *info = data->chip_info;

	ssize_t len = 0;

	int i;



	for (i = 0; i < info->als_gain_tbl_size; i++) {

		if (info->als_gain[i].scale == LTR501_RESERVED_GAIN)

			continue;

		len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",

				 info->als_gain[i].scale,

				 info->als_gain[i].uscale);

	}



	buf[len - 1] = '\n';



	return len;

}



static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4");

static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("20 10 5 2 1 0.5");



static IIO_DEVICE_ATTR(in_proximity_scale_available, S_IRUGO,

		       ltr501_show_proximity_scale_avail, NULL, 0);

static IIO_DEVICE_ATTR(in_intensity_scale_available, S_IRUGO,

		       ltr501_show_intensity_scale_avail, NULL, 0);



static struct attribute *ltr501_attributes[] = {

	&iio_const_attr_in_proximity_scale_available.dev_attr.attr,

	&iio_const_attr_in_intensity_scale_available.dev_attr.attr,

	&iio_dev_attr_in_proximity_scale_available.dev_attr.attr,

	&iio_dev_attr_in_intensity_scale_available.dev_attr.attr,

	&iio_const_attr_integration_time_available.dev_attr.attr,

	&iio_const_attr_sampling_frequency_available.dev_attr.attr,

	NULL
@@ -962,6 +1062,29 @@ static const struct iio_info ltr501_info = { 
	.driver_module = THIS_MODULE,

};



static struct ltr501_chip_info ltr501_chip_info_tbl[] = {

	[ltr501] = {

		.partid = 0x08,

		.als_gain = ltr501_als_gain_tbl,

		.als_gain_tbl_size = ARRAY_SIZE(ltr501_als_gain_tbl),

		.ps_gain = ltr501_ps_gain_tbl,

		.ps_gain_tbl_size = ARRAY_SIZE(ltr501_ps_gain_tbl),

		.als_mode_active = BIT(0) | BIT(1),

		.als_gain_mask = BIT(3),

		.als_gain_shift = 3,

	},

	[ltr559] = {

		.partid = 0x09,

		.als_gain = ltr559_als_gain_tbl,

		.als_gain_tbl_size = ARRAY_SIZE(ltr559_als_gain_tbl),

		.ps_gain = ltr559_ps_gain_tbl,

		.ps_gain_tbl_size = ARRAY_SIZE(ltr559_ps_gain_tbl),

		.als_mode_active = BIT(1),

		.als_gain_mask = BIT(2) | BIT(3) | BIT(4),

		.als_gain_shift = 2,

	},

};



static int ltr501_write_contr(struct ltr501_data *data, u8 als_val, u8 ps_val)

{

	int ret;
@@ -1062,7 +1185,7 @@ static int ltr501_init(struct ltr501_data *data) 
	if (ret < 0)

		return ret;



	data->als_contr = status | LTR501_CONTR_ACTIVE;

	data->als_contr = ret | data->chip_info->als_mode_active;



	ret = regmap_read(data->regmap, LTR501_PS_CONTR, &status);

	if (ret < 0)
@@ -1105,17 +1228,30 @@ static struct regmap_config ltr501_regmap_config = { 


static int ltr501_powerdown(struct ltr501_data *data)

{

	return ltr501_write_contr(data, data->als_contr & ~LTR501_CONTR_ACTIVE,

	return ltr501_write_contr(data, data->als_contr &

				  ~data->chip_info->als_mode_active,

				  data->ps_contr & ~LTR501_CONTR_ACTIVE);

}



static const char *ltr501_match_acpi_device(struct device *dev, int *chip_idx)

{

	const struct acpi_device_id *id;



	id = acpi_match_device(dev->driver->acpi_match_table, dev);

	if (!id)

		return NULL;

	*chip_idx = id->driver_data;

	return dev_name(dev);

}



static int ltr501_probe(struct i2c_client *client,

			const struct i2c_device_id *id)

{

	struct ltr501_data *data;

	struct iio_dev *indio_dev;

	struct regmap *regmap;

	int ret, partid;

	int ret, partid, chip_idx = 0;

	const char *name = NULL;



	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));

	if (!indio_dev)
@@ -1186,13 +1322,25 @@ static int ltr501_probe(struct i2c_client *client, 
	ret = regmap_read(data->regmap, LTR501_PART_ID, &partid);

	if (ret < 0)

		return ret;

	if ((partid >> 4) != 0x8)



	if (id) {

		name = id->name;

		chip_idx = id->driver_data;

	} else  if (ACPI_HANDLE(&client->dev)) {

		name = ltr501_match_acpi_device(&client->dev, &chip_idx);

	} else {

		return -ENODEV;

	}



	data->chip_info = &ltr501_chip_info_tbl[chip_idx];



	if ((partid >> 4) != data->chip_info->partid)

		return -ENODEV;



	indio_dev->dev.parent = &client->dev;

	indio_dev->channels = ltr501_channels;

	indio_dev->num_channels = ARRAY_SIZE(ltr501_channels);

	indio_dev->name = LTR501_DRV_NAME;

	indio_dev->name = name;

	indio_dev->modes = INDIO_DIRECT_MODE;



	ret = ltr501_init(data);
@@ -1266,13 +1414,15 @@ static int ltr501_resume(struct device *dev) 
static SIMPLE_DEV_PM_OPS(ltr501_pm_ops, ltr501_suspend, ltr501_resume);



static const struct acpi_device_id ltr_acpi_match[] = {

	{"LTER0501", 0},

	{"LTER0501", ltr501},

	{"LTER0559", ltr559},

	{ },

};

MODULE_DEVICE_TABLE(acpi, ltr_acpi_match);



static const struct i2c_device_id ltr501_id[] = {

	{ "ltr501", 0 },

	{ "ltr501", ltr501},

	{ "ltr559", ltr559},

	{ }

};

MODULE_DEVICE_TABLE(i2c, ltr501_id);

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