summaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorEugen Hristev <eugen.hristev@microchip.com>2018-09-24 10:51:44 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2018-09-29 12:30:24 +0100
commitaea835f2dc8a682942b859179c49ad1841a6c8b9 (patch)
treeedc3e2bb8c0e240cc4a61ffe669ae8fd9034eca0 /drivers
parentbc1b45326223e7e890053cf6266357adfa61942d (diff)
iio: adc: at91: fix wrong channel number in triggered buffer mode
When channels are registered, the hardware channel number is not the actual iio channel number. This is because the driver is probed with a certain number of accessible channels. Some pins are routed and some not, depending on the description of the board in the DT. Because of that, channels 0,1,2,3 can correspond to hardware channels 2,3,4,5 for example. In the buffered triggered case, we need to do the translation accordingly. Fixed the channel number to stop reading the wrong channel. Fixes: 0e589d5fb ("ARM: AT91: IIO: Add AT91 ADC driver.") Cc: Maxime Ripard <maxime.ripard@bootlin.com> Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/iio/adc/at91_adc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index e3be88e7192c..75d2f73582a3 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -248,12 +248,14 @@ static irqreturn_t at91_adc_trigger_handler(int irq, void *p)
struct iio_poll_func *pf = p;
struct iio_dev *idev = pf->indio_dev;
struct at91_adc_state *st = iio_priv(idev);
+ struct iio_chan_spec const *chan;
int i, j = 0;
for (i = 0; i < idev->masklength; i++) {
if (!test_bit(i, idev->active_scan_mask))
continue;
- st->buffer[j] = at91_adc_readl(st, AT91_ADC_CHAN(st, i));
+ chan = idev->channels + i;
+ st->buffer[j] = at91_adc_readl(st, AT91_ADC_CHAN(st, chan->channel));
j++;
}