linux-kernel - [PATCH 1/4] iio: adc: mcp3422: fix scale read bug

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Date:   Fri, 11 Nov 2022 12:26:53 +0100
From:   Mitja Spes <mitja@...av.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Mitja Spes <mitja@...av.com>,
        Angelo Compagnucci <angelo.compagnucci@...il.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] iio: adc: mcp3422: fix scale read bug

Scale was returned for currently active channel instead of the specified
channel.

Signed-off-by: Mitja Spes <mitja@...av.com>
Fixes: 07914c84ba30 ("iio: adc: Add driver for Microchip MCP3422/3/4 high resolution ADC")
---
 drivers/iio/adc/mcp3422.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/mcp3422.c b/drivers/iio/adc/mcp3422.c
index da353dcb1e9d..3d53de300c89 100644
--- a/drivers/iio/adc/mcp3422.c
+++ b/drivers/iio/adc/mcp3422.c
@@ -164,8 +164,9 @@ static int mcp3422_read_raw(struct iio_dev *iio,
 	struct mcp3422 *adc = iio_priv(iio);
 	int err;
 
+	u8 req_channel = channel->channel;
 	u8 sample_rate = MCP3422_SAMPLE_RATE(adc->config);
-	u8 pga		 = MCP3422_PGA(adc->config);
+	u8 pga		 = adc->pga[req_channel];
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
@@ -175,7 +176,6 @@ static int mcp3422_read_raw(struct iio_dev *iio,
 		return IIO_VAL_INT;
 
 	case IIO_CHAN_INFO_SCALE:
-
 		*val1 = 0;
 		*val2 = mcp3422_scales[sample_rate][pga];
 		return IIO_VAL_INT_PLUS_NANO;
-- 
2.34.1