From: Peter Meerwald Date: Sat, 6 Dec 2014 05:54:00 +0000 (+0000) Subject: iio:adc:ad799x: Fix reading and writing of event values, apply shift X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=361d79500244cc734588534d2756e2495f1549a6;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git iio:adc:ad799x: Fix reading and writing of event values, apply shift last two bits of ADC and limit values are zero and should not be reported (ad7993, ad7997); compare with read_raw() event values are 10 (ad7993, ad7997) or 12 bit max., check the range on write Signed-off-by: Peter Meerwald Cc: Stable@vger.kernel.org Acked-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c index 39b4cb48d738..6eba301ee03d 100644 --- a/drivers/iio/adc/ad799x.c +++ b/drivers/iio/adc/ad799x.c @@ -427,9 +427,12 @@ static int ad799x_write_event_value(struct iio_dev *indio_dev, int ret; struct ad799x_state *st = iio_priv(indio_dev); + if (val < 0 || val > RES_MASK(chan->scan_type.realbits)) + return -EINVAL; + mutex_lock(&indio_dev->mlock); ret = ad799x_i2c_write16(st, ad799x_threshold_reg(chan, dir, info), - val); + val << chan->scan_type.shift); mutex_unlock(&indio_dev->mlock); return ret; @@ -452,7 +455,8 @@ static int ad799x_read_event_value(struct iio_dev *indio_dev, mutex_unlock(&indio_dev->mlock); if (ret < 0) return ret; - *val = valin; + *val = (valin >> chan->scan_type.shift) & + RES_MASK(chan->scan_type.realbits); return IIO_VAL_INT; }