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iio: ltr501: Add integration time support

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Added support to modify and read ALS integration time.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Kuppuswamy Sathyanarayanan 2015-04-19 02:10:01 -07:00 committed by Jonathan Cameron
parent 49064b5a61
commit 844b47027d
1 changed files with 89 additions and 1 deletions
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90
drivers/iio/light/ltr501.c
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@ -28,6 +28,7 @@
#define LTR501_ALS_CONTR 0x80 /* ALS operation mode, SW reset */
#define LTR501_PS_CONTR 0x81 /* PS operation mode */
#define LTR501_ALS_MEAS_RATE 0x85 /* ALS integ time, measurement rate*/
#define LTR501_PART_ID 0x86
#define LTR501_MANUFAC_ID 0x87
#define LTR501_ALS_DATA1 0x88 /* 16-bit, little endian */
@ -49,11 +50,17 @@
#define LTR501_REGMAP_NAME "ltr501_regmap"
static const int int_time_mapping[] = {100000, 50000, 200000, 400000};
static const struct reg_field reg_field_it =
REG_FIELD(LTR501_ALS_MEAS_RATE, 3, 4);
struct ltr501_data {
struct i2c_client *client;
struct mutex lock_als, lock_ps;
u8 als_contr, ps_contr;
struct regmap *regmap;
struct regmap_field *reg_it;
};
static int ltr501_drdy(struct ltr501_data *data, u8 drdy_mask)
@ -74,6 +81,58 @@ static int ltr501_drdy(struct ltr501_data *data, u8 drdy_mask)
return -EIO;
}
static int ltr501_set_it_time(struct ltr501_data *data, int it)
{
int ret, i, index = -1, status;
for (i = 0; i < ARRAY_SIZE(int_time_mapping); i++) {
if (int_time_mapping[i] == it) {
index = i;
break;
}
}
/* Make sure integ time index is valid */
if (index < 0)
return -EINVAL;
ret = regmap_read(data->regmap, LTR501_ALS_CONTR, &status);
if (ret < 0)
return ret;
if (status & LTR501_CONTR_ALS_GAIN_MASK) {
/*
* 200 ms and 400 ms integ time can only be
* used in dynamic range 1
*/
if (index > 1)
return -EINVAL;
} else
/* 50 ms integ time can only be used in dynamic range 2 */
if (index == 1)
return -EINVAL;
return regmap_field_write(data->reg_it, index);
}
/* read int time in micro seconds */
static int ltr501_read_it_time(struct ltr501_data *data, int *val, int *val2)
{
int ret, index;
ret = regmap_field_read(data->reg_it, &index);
if (ret < 0)
return ret;
/* Make sure integ time index is valid */
if (index < 0 || index >= ARRAY_SIZE(int_time_mapping))
return -EINVAL;
*val2 = int_time_mapping[index];
*val = 0;
return IIO_VAL_INT_PLUS_MICRO;
}
static int ltr501_read_als(struct ltr501_data *data, __le16 buf[2])
{
int ret;
@ -121,7 +180,8 @@ static int ltr501_read_ps(struct ltr501_data *data)
static const struct iio_chan_spec ltr501_channels[] = {
LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0),
LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
BIT(IIO_CHAN_INFO_SCALE)),
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_INT_TIME)),
{
.type = IIO_PROXIMITY,
.address = LTR501_PS_DATA,
@ -196,6 +256,13 @@ static int ltr501_read_raw(struct iio_dev *indio_dev,
default:
return -EINVAL;
}
case IIO_CHAN_INFO_INT_TIME:
switch (chan->type) {
case IIO_INTENSITY:
return ltr501_read_it_time(data, val, val2);
default:
return -EINVAL;
}
}
return -EINVAL;
}
@ -246,16 +313,30 @@ static int ltr501_write_raw(struct iio_dev *indio_dev,
default:
return -EINVAL;
}
case IIO_CHAN_INFO_INT_TIME:
switch (chan->type) {
case IIO_INTENSITY:
if (val != 0)
return -EINVAL;
mutex_lock(&data->lock_als);
i = ltr501_set_it_time(data, val2);
mutex_unlock(&data->lock_als);
return i;
default:
return -EINVAL;
}
}
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 IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4");
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_const_attr_integration_time_available.dev_attr.attr,
NULL
};
@ -404,6 +485,13 @@ static int ltr501_probe(struct i2c_client *client,
mutex_init(&data->lock_als);
mutex_init(&data->lock_ps);
data->reg_it = devm_regmap_field_alloc(&client->dev, regmap,
reg_field_it);
if (IS_ERR(data->reg_it)) {
dev_err(&client->dev, "Integ time reg field init failed.\n");
return PTR_ERR(data->reg_it);
}
ret = regmap_read(data->regmap, LTR501_PART_ID, &partid);
if (ret < 0)
return ret;