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staging/iio/mxs-lradc: fix preenable for multiple buffers

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This fixes 'preenable failed: -EINVAL' error when using this driver.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Michał Mirosław 2013-05-04 14:19:00 +01:00 committed by Jonathan Cameron
parent c7b0cf3e71
commit c80712c793
1 changed files with 2 additions and 3 deletions
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5
drivers/staging/iio/adc/mxs-lradc.c
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@ -690,7 +690,6 @@ static void mxs_lradc_trigger_remove(struct iio_dev *iio)
static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
{
struct mxs_lradc *lradc = iio_priv(iio);
struct iio_buffer *buffer = iio->buffer;
int ret = 0, chan, ofs = 0;
unsigned long enable = 0;
uint32_t ctrl4_set = 0;
@ -698,7 +697,7 @@ static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
uint32_t ctrl1_irq = 0;
const uint32_t chan_value = LRADC_CH_ACCUMULATE |
((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
const int len = bitmap_weight(buffer->scan_mask, LRADC_MAX_TOTAL_CHANS);
const int len = bitmap_weight(iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS);
if (!len)
return -EINVAL;
@ -725,7 +724,7 @@ static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
lradc->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR);
writel(0xff, lradc->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR);
for_each_set_bit(chan, buffer->scan_mask, LRADC_MAX_TOTAL_CHANS) {
for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);