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authorSean Nyekjaer <sean.nyekjaer@prevas.dk>2018-05-09 20:17:18 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2018-05-12 12:00:30 +0100
commit2a86487786b5c9ce7bee21efc9ce196bb7fe0aed (patch)
treed34b29b89bb4431794d10ad3e80678767b800969 /drivers/iio
parent0cb2aab8f820cfc764d18b9a2ee55f4a6003f782 (diff)
downloadlinux-2a86487786b5c9ce7bee21efc9ce196bb7fe0aed.tar.bz2
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>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/adc/ti-ads8688.c48
1 files changed, 45 insertions, 3 deletions
diff --git a/drivers/iio/adc/ti-ads8688.c b/drivers/iio/adc/ti-ads8688.c
index 079f133144b0..184d686ebd99 100644
--- a/drivers/iio/adc/ti-ads8688.c
+++ b/drivers/iio/adc/ti-ads8688.c
@@ -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);