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Commit cf6ab943 authored by Eugen Hristev's avatar Eugen Hristev Committed by Greg Kroah-Hartman
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iio: adc: at91: fix wrong channel number in triggered buffer mode 



commit aea835f2dc8a682942b859179c49ad1841a6c8b9 upstream.

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: 0e589d5f ("ARM: AT91: IIO: Add AT91 ADC driver.")
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: default avatarEugen Hristev <eugen.hristev@microchip.com>
Acked-by: default avatarLudovic Desroches <ludovic.desroches@microchip.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b7e95f41

drivers/iio/adc/at91_adc.c

+3 −1
Original line number Diff line number Diff line
@@ -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++;

	}