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iio: ltr501: Add support for ltr559 chip

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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: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Daniel Baluta 2015-04-21 19:10:59 +03:00 committed by Jonathan Cameron
parent 772154d0dd
commit 8592a7eefa
2 changed files with 186 additions and 35 deletions
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3
drivers/iio/light/Kconfig
View file

@ -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.

218
drivers/iio/light/ltr501.c
View file

@ -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;
return IIO_VAL_INT_PLUS_MICRO;
}
*val = 1;
*val2 = 0;
return IIO_VAL_INT;
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;
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);