iio: ti_am335x_adc: check if we found the value
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>
diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 8ffe52d..4427e8e 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -145,6 +145,7 @@
int i;
unsigned int fifo1count, read;
u32 step = UINT_MAX;
+ bool found = false;
/*
* When the sub-system is first enabled,
@@ -169,11 +170,14 @@
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;
}