From: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx>
commit 89a86da5cb8e0ee153111fb68a719d31582c206b upstream.
IRQ type in ad_sigma_delta_info struct was missing.
In Sigma-Delta devices the SDO line is also used as an interrupt.
Leaving IRQ on level instead of falling might trigger a sample read
when the IRQ is enabled, as the SDO line is already low. Not sure
if SDO line will always immediately go high in ad_sd_buffer_postenable
before the IRQ is enabled.
Also the datasheet seem to explicitly say the falling edge of the SDO
should be used as an interrupt:
>From the AD7192 datasheet: "The DOUT/RDY falling edge can be used
as an interrupt to a processor,"
Fixes: da4d3d6bb9f6 ("iio: adc: ad-sigma-delta: Allow custom IRQ flags")
Signed-off-by: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx>
Cc: <Stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210906065630.16325-2-alexandru.tachici@xxxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/adc/ad7192.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/iio/adc/ad7192.c
+++ b/drivers/iio/adc/ad7192.c
@@ -293,6 +293,7 @@ static const struct ad_sigma_delta_info
.has_registers = true,
.addr_shift = 3,
.read_mask = BIT(6),
+ .irq_flags = IRQF_TRIGGER_FALLING,
};
static const struct ad_sd_calib_data ad7192_calib_arr[8] = {
