iio: potentiometer: ds1803: Add device specific read_raw function

Added function pointer in the device specific structure to
call the appropriate device read_raw function, so that the
other type of devices with different read method can be
handled.

Signed-off-by: Jagath Jog J <jagathjog1996@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220223163525.13399-6-jagathjog1996@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/potentiometer/ds1803.c b/drivers/iio/potentiometer/ds1803.c
index 0c274ec..017afa9 100644 (file)
--- a/drivers/iio/potentiometer/ds1803.c
+++ b/drivers/iio/potentiometer/ds1803.c
@@ -32,6 +32,8 @@ struct ds1803_cfg {
        int kohms;
        const struct iio_chan_spec *channels;
        u8 num_channels;
+       int (*read)(struct iio_dev *indio_dev,
+                   struct iio_chan_spec const *chan, int *val);
 };
 
 struct ds1803_data {
@@ -55,6 +57,22 @@ static const struct iio_chan_spec ds1803_channels[] = {
        DS1803_CHANNEL(1, DS1803_WIPER_1),
 };
 
+static int ds1803_read(struct iio_dev *indio_dev,
+                      struct iio_chan_spec const *chan,
+                      int *val)
+{
+       struct ds1803_data *data = iio_priv(indio_dev);
+       int ret;
+       u8 result[ARRAY_SIZE(ds1803_channels)];
+
+       ret = i2c_master_recv(data->client, result, indio_dev->num_channels);
+       if (ret < 0)
+               return ret;
+
+       *val = result[chan->channel];
+       return ret;
+}
+
 static const struct ds1803_cfg ds1803_cfg[] = {
        [DS1803_010] = {
                .wipers = 2,
@@ -62,6 +80,7 @@ static const struct ds1803_cfg ds1803_cfg[] = {
                .kohms =  10,
                .channels = ds1803_channels,
                .num_channels = ARRAY_SIZE(ds1803_channels),
+               .read = ds1803_read,
        },
        [DS1803_050] = {
                .wipers = 2,
@@ -69,6 +88,7 @@ static const struct ds1803_cfg ds1803_cfg[] = {
                .kohms =  50,
                .channels = ds1803_channels,
                .num_channels = ARRAY_SIZE(ds1803_channels),
+               .read = ds1803_read,
        },
        [DS1803_100] = {
                .wipers = 2,
@@ -76,6 +96,7 @@ static const struct ds1803_cfg ds1803_cfg[] = {
                .kohms = 100,
                .channels = ds1803_channels,
                .num_channels = ARRAY_SIZE(ds1803_channels),
+               .read = ds1803_read,
        },
 };
 
@@ -84,18 +105,14 @@ static int ds1803_read_raw(struct iio_dev *indio_dev,
                           int *val, int *val2, long mask)
 {
        struct ds1803_data *data = iio_priv(indio_dev);
-       int pot = chan->channel;
        int ret;
-       u8 result[ARRAY_SIZE(ds1803_channels)];
 
        switch (mask) {
        case IIO_CHAN_INFO_RAW:
-               ret = i2c_master_recv(data->client, result,
-                                     indio_dev->num_channels);
+               ret = data->cfg->read(indio_dev, chan, val);
                if (ret < 0)
                        return ret;
 
-               *val = result[pot];
                return IIO_VAL_INT;
 
        case IIO_CHAN_INFO_SCALE: