[PATCH v3] iio: adc: Correct conditional logic for store mode

[Gabriel Shahrouzi <gshahrouzi@gmail.com>]

The mode setting logic in ad7816_store_mode was reversed due to
incorrect handling of the strcmp return value. strcmp returns 0 on
match, so the `if (strcmp(buf, "full"))` block executed when the
input was not "full".

This resulted in "full" setting the mode to AD7816_PD (power-down) and
other inputs setting it to AD7816_FULL.

Fix this by checking it against 0 to correctly check for "full" and
"power-down", mapping them to AD7816_FULL and AD7816_PD respectively.

Fixes: 7924425db04a ("staging: iio: adc: new driver for AD7816 devices")
Cc: stable@vger.kernel.org
Signed-off-by: Gabriel Shahrouzi <gshahrouzi@gmail.com>
---
Changes since v3:
	- Tag stable@vger.kernel.org instead of an email CC
	- Use the correct version for patch
Changes since v2:
	- Add fixes tag that references commit that introduced the bug.
        - Replace sysfs_streq with strcmp.
---
 drivers/staging/iio/adc/ad7816.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/iio/adc/ad7816.c b/drivers/staging/iio/adc/ad7816.c
index 6c14d7bcdd675..081b17f498638 100644
--- a/drivers/staging/iio/adc/ad7816.c
+++ b/drivers/staging/iio/adc/ad7816.c
@@ -136,7 +136,7 @@ static ssize_t ad7816_store_mode(struct device *dev,
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad7816_chip_info *chip = iio_priv(indio_dev);
 
-	if (strcmp(buf, "full")) {
+	if (strcmp(buf, "full") == 0) {
 		gpiod_set_value(chip->rdwr_pin, 1);
 		chip->mode = AD7816_FULL;
 	} else {
-- 
2.43.0