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iio: ti_am335x_adc: check if we found the value

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Usually we get all the values we wanted but it is possible, that te ADC
unit is busy performing the conversation for the HW events. In that case
-EBUSY is returned and the user may re-call the function.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2013-05-29 18:49:55 +02:00
parent 18926edebc
commit 1460c152c5
1 changed files with 6 additions and 2 deletions
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8
drivers/iio/adc/ti_am335x_adc.c
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@ -145,6 +145,7 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
int i;
unsigned int fifo1count, read;
u32 step = UINT_MAX;
bool found = false;
/*
* When the sub-system is first enabled,
@ -169,11 +170,14 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
for (i = 0; i < fifo1count; i++) {
read = tiadc_readl(adc_dev, REG_FIFO1);
if (read >> 16 == step)
if (read >> 16 == step) {
*val = read & 0xfff;
found = true;
}
}
am335x_tsc_se_update(adc_dev->mfd_tscadc);
if (found == false)
return -EBUSY;
return IIO_VAL_INT;
}