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>
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@ -85,6 +85,13 @@ static const struct iio_chan_spec max44000_channels[] = {
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
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},
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},
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{
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.type = IIO_CURRENT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.extend_name = "led",
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.output = 1,
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},
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};
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};
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static int max44000_read_alsval(struct max44000_data *data)
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static int max44000_read_alsval(struct max44000_data *data)
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@ -125,6 +132,20 @@ static int max44000_write_led_current_raw(struct max44000_data *data, int val)
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MAX44000_LED_CURRENT_MASK, val);
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MAX44000_LED_CURRENT_MASK, val);
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}
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}
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static int max44000_read_led_current_raw(struct max44000_data *data)
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{
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unsigned int regval;
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int ret;
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ret = regmap_read(data->regmap, MAX44000_REG_CFG_TX, ®val);
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if (ret < 0)
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return ret;
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regval &= MAX44000_LED_CURRENT_MASK;
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if (regval >= 8)
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regval -= 4;
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return regval;
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}
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static int max44000_read_raw(struct iio_dev *indio_dev,
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static int max44000_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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int *val, int *val2, long mask)
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@ -154,12 +175,26 @@ static int max44000_read_raw(struct iio_dev *indio_dev,
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*val = regval;
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*val = regval;
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return IIO_VAL_INT;
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return IIO_VAL_INT;
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case IIO_CURRENT:
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mutex_lock(&data->lock);
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ret = max44000_read_led_current_raw(data);
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mutex_unlock(&data->lock);
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if (ret < 0)
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return ret;
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*val = ret;
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return IIO_VAL_INT;
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default:
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default:
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return -EINVAL;
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return -EINVAL;
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}
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}
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case IIO_CHAN_INFO_SCALE:
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case IIO_CHAN_INFO_SCALE:
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switch (chan->type) {
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switch (chan->type) {
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case IIO_CURRENT:
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/* Output register is in 10s of miliamps */
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*val = 10;
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return IIO_VAL_INT;
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case IIO_LIGHT:
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case IIO_LIGHT:
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*val = 1;
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*val = 1;
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*val2 = MAX44000_ALS_TO_LUX_DEFAULT_FRACTION_LOG2;
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*val2 = MAX44000_ALS_TO_LUX_DEFAULT_FRACTION_LOG2;
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@ -174,9 +209,27 @@ static int max44000_read_raw(struct iio_dev *indio_dev,
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}
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}
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}
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}
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static int max44000_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct max44000_data *data = iio_priv(indio_dev);
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int ret;
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if (mask == IIO_CHAN_INFO_RAW && chan->type == IIO_CURRENT) {
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mutex_lock(&data->lock);
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ret = max44000_write_led_current_raw(data, val);
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mutex_unlock(&data->lock);
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return ret;
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}
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return -EINVAL;
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}
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static const struct iio_info max44000_info = {
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static const struct iio_info max44000_info = {
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.driver_module = THIS_MODULE,
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.driver_module = THIS_MODULE,
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.read_raw = max44000_read_raw,
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.read_raw = max44000_read_raw,
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.write_raw = max44000_write_raw,
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};
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};
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static bool max44000_readable_reg(struct device *dev, unsigned int reg)
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static bool max44000_readable_reg(struct device *dev, unsigned int reg)
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