diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/adc/ad7923.c | 60 |
1 files changed, 53 insertions, 7 deletions
diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c index 36eee248a9f6..11ccc42b25a6 100644 --- a/drivers/iio/adc/ad7923.c +++ b/drivers/iio/adc/ad7923.c @@ -12,6 +12,7 @@ #include <linux/slab.h> #include <linux/sysfs.h> #include <linux/spi/spi.h> +#include <linux/regulator/consumer.h> #include <linux/err.h> #include <linux/delay.h> #include <linux/module.h> @@ -56,6 +57,11 @@ struct ad7923_state { struct spi_transfer scan_single_xfer[2]; struct spi_message ring_msg; struct spi_message scan_single_msg; + + struct regulator *reg; + + unsigned int settings; + /* * DMA (thus cache coherency maintenance) requires the * transfer buffers to live in their own cache lines. @@ -100,10 +106,9 @@ static int ad7923_update_scan_mode(struct iio_dev *indio_dev, len = 0; for_each_set_bit(i, active_scan_mask, AD7923_MAX_CHAN) { - cmd = AD7923_WRITE_CR | AD7923_CODING | AD7923_RANGE | - AD7923_PM_MODE_WRITE(AD7923_PM_MODE_OPS) | + cmd = AD7923_WRITE_CR | AD7923_CHANNEL_WRITE(i) | AD7923_SEQUENCE_WRITE(AD7923_SEQUENCE_OFF) | - AD7923_CHANNEL_WRITE(i); + st->settings; cmd <<= AD7923_SHIFT_REGISTER; st->tx_buf[len++] = cpu_to_be16(cmd); } @@ -163,9 +168,9 @@ static int ad7923_scan_direct(struct ad7923_state *st, unsigned ch) { int ret, cmd; - cmd = AD7923_WRITE_CR | AD7923_PM_MODE_WRITE(AD7923_PM_MODE_OPS) | - AD7923_SEQUENCE_WRITE(AD7923_SEQUENCE_OFF) | AD7923_CODING | - AD7923_CHANNEL_WRITE(ch) | AD7923_RANGE; + cmd = AD7923_WRITE_CR | AD7923_CHANNEL_WRITE(ch) | + AD7923_SEQUENCE_WRITE(AD7923_SEQUENCE_OFF) | + st->settings; cmd <<= AD7923_SHIFT_REGISTER; st->tx_buf[0] = cpu_to_be16(cmd); @@ -176,6 +181,22 @@ static int ad7923_scan_direct(struct ad7923_state *st, unsigned ch) return be16_to_cpu(st->rx_buf[0]); } +static int ad7923_get_range(struct ad7923_state *st) +{ + int vref; + + vref = regulator_get_voltage(st->reg); + if (vref < 0) + return vref; + + vref /= 1000; + + if (!(st->settings & AD7923_RANGE)) + vref *= 2; + + return vref; +} + static int ad7923_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, @@ -203,6 +224,13 @@ static int ad7923_read_raw(struct iio_dev *indio_dev, return -EIO; return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + ret = ad7923_get_range(st); + if (ret < 0) + return ret; + *val = ret; + *val2 = chan->scan_type.realbits; + return IIO_VAL_FRACTIONAL_LOG2; } return -EINVAL; } @@ -227,6 +255,8 @@ static int ad7923_probe(struct spi_device *spi) spi_set_drvdata(spi, indio_dev); st->spi = spi; + st->settings = AD7923_CODING | AD7923_RANGE | + AD7923_PM_MODE_WRITE(AD7923_PM_MODE_OPS); indio_dev->name = spi_get_device_id(spi)->name; indio_dev->dev.parent = &spi->dev; @@ -247,10 +277,19 @@ static int ad7923_probe(struct spi_device *spi) spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg); spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg); + st->reg = regulator_get(&spi->dev, "refin"); + if (IS_ERR(st->reg)) { + ret = PTR_ERR(st->reg); + goto error_free; + } + ret = regulator_enable(st->reg); + if (ret) + goto error_put_reg; + ret = iio_triggered_buffer_setup(indio_dev, NULL, &ad7923_trigger_handler, NULL); if (ret) - goto error_free; + goto error_disable_reg; ret = iio_device_register(indio_dev); if (ret) @@ -260,6 +299,10 @@ static int ad7923_probe(struct spi_device *spi) error_cleanup_ring: iio_triggered_buffer_cleanup(indio_dev); +error_disable_reg: + regulator_disable(st->reg); +error_put_reg: + regulator_put(st->reg); error_free: iio_device_free(indio_dev); @@ -269,9 +312,12 @@ error_free: static int ad7923_remove(struct spi_device *spi) { struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct ad7923_state *st = iio_priv(indio_dev); iio_device_unregister(indio_dev); iio_triggered_buffer_cleanup(indio_dev); + regulator_disable(st->reg); + regulator_put(st->reg); iio_device_free(indio_dev); return 0; |