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max44000: Support controlling LED current output 

This is exposed as an output channel with "led" as an extend_name.

Other sensors also have support for controlling an external LED. It's
not clear that simply exposing an undecorated output channel is the
correct approach.

Signed-off-by: Crestez Dan Leonard <leonard.crestez@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Crestez Dan Leonard 2016-04-18 17:31:55 +03:00 committed by Jonathan Cameron
parent 35b651f391
commit 237a378b3b
1 changed files with 53 additions and 0 deletions
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53
drivers/iio/light/max44000.c
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@ -85,6 +85,13 @@ static const struct iio_chan_spec max44000_channels[] = {
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
},
{
.type = IIO_CURRENT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
.extend_name = "led",
.output = 1,
},
};
static int max44000_read_alsval(struct max44000_data *data)
@ -125,6 +132,20 @@ static int max44000_write_led_current_raw(struct max44000_data *data, int val)
MAX44000_LED_CURRENT_MASK, val);
}
static int max44000_read_led_current_raw(struct max44000_data *data)
{
unsigned int regval;
int ret;
ret = regmap_read(data->regmap, MAX44000_REG_CFG_TX, &regval);
if (ret < 0)
return ret;
regval &= MAX44000_LED_CURRENT_MASK;
if (regval >= 8)
regval -= 4;
return regval;
}
static int max44000_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
@ -154,12 +175,26 @@ static int max44000_read_raw(struct iio_dev *indio_dev,
*val = regval;
return IIO_VAL_INT;
case IIO_CURRENT:
mutex_lock(&data->lock);
ret = max44000_read_led_current_raw(data);
mutex_unlock(&data->lock);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_CURRENT:
/* Output register is in 10s of miliamps */
*val = 10;
return IIO_VAL_INT;
case IIO_LIGHT:
*val = 1;
*val2 = MAX44000_ALS_TO_LUX_DEFAULT_FRACTION_LOG2;
@ -174,9 +209,27 @@ static int max44000_read_raw(struct iio_dev *indio_dev,
}
}
static int max44000_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct max44000_data *data = iio_priv(indio_dev);
int ret;
if (mask == IIO_CHAN_INFO_RAW && chan->type == IIO_CURRENT) {
mutex_lock(&data->lock);
ret = max44000_write_led_current_raw(data, val);
mutex_unlock(&data->lock);
return ret;
}
return -EINVAL;
}
static const struct iio_info max44000_info = {
.driver_module = THIS_MODULE,
.read_raw = max44000_read_raw,
.write_raw = max44000_write_raw,
};
static bool max44000_readable_reg(struct device *dev, unsigned int reg)