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iio: adc: ti-ads8688: add trigger and buffer support 

Signed-off-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
hifive-unleashed-5.1
Sean Nyekjaer 2018-05-09 20:17:18 +02:00 committed by Jonathan Cameron
parent 0cb2aab8f8
commit 2a86487786
1 changed files with 45 additions and 3 deletions
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48
drivers/iio/adc/ti-ads8688.c
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@ -17,6 +17,9 @@
#include <linux/of.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/sysfs.h>
#define ADS8688_CMD_REG(x) (x << 8)
@ -155,6 +158,13 @@ static const struct attribute_group ads8688_attribute_group = {
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \
| BIT(IIO_CHAN_INFO_SCALE) \
| BIT(IIO_CHAN_INFO_OFFSET), \
.scan_index = index, \
.scan_type = { \
.sign = 'u', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_BE, \
}, \
}
static const struct iio_chan_spec ads8684_channels[] = {
@ -371,6 +381,28 @@ static const struct iio_info ads8688_info = {
.attrs = &ads8688_attribute_group,
};
static irqreturn_t ads8688_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
u16 buffer[8];
int i, j = 0;
for (i = 0; i < indio_dev->masklength; i++) {
if (!test_bit(i, indio_dev->active_scan_mask))
continue;
buffer[j] = ads8688_read(indio_dev, i);
j++;
}
iio_push_to_buffers_with_timestamp(indio_dev, buffer,
pf->timestamp);
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static const struct ads8688_chip_info ads8688_chip_info_tbl[] = {
[ID_ADS8684] = {
.channels = ads8684_channels,
@ -402,7 +434,7 @@ static int ads8688_probe(struct spi_device *spi)
ret = regulator_get_voltage(st->reg);
if (ret < 0)
goto error_out;
goto err_regulator_disable;
st->vref_mv = ret / 1000;
} else {
@ -430,13 +462,22 @@ static int ads8688_probe(struct spi_device *spi)
mutex_init(&st->lock);
ret = iio_triggered_buffer_setup(indio_dev, NULL, ads8688_trigger_handler, NULL);
if (ret < 0) {
dev_err(&spi->dev, "iio triggered buffer setup failed\n");
goto err_regulator_disable;
}
ret = iio_device_register(indio_dev);
if (ret)
goto error_out;
goto err_buffer_cleanup;
return 0;
error_out:
err_buffer_cleanup:
iio_triggered_buffer_cleanup(indio_dev);
err_regulator_disable:
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
@ -449,6 +490,7 @@ static int ads8688_remove(struct spi_device *spi)
struct ads8688_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
if (!IS_ERR(st->reg))
regulator_disable(st->reg);