iio: potentiometer: mcp4531: use pointer to access model parameters

Use const pointer to element from model configuration array rather then array
index, as it will not change anyway.

Signed-off-by: Slawomir Stepien <sst@poczta.fm>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/potentiometer/mcp4531.c b/drivers/iio/potentiometer/mcp4531.c
index 0db67fe1476695a2b95af4f61036b98f25310b19..3b72e1a595db8634d6b94baf36aebcb29ec37ef6 100644 (file)
--- a/drivers/iio/potentiometer/mcp4531.c
+++ b/drivers/iio/potentiometer/mcp4531.c
@@ -79,7 +79,7 @@ static const struct mcp4531_cfg mcp4531_cfg[] = {
 
 struct mcp4531_data {
        struct i2c_client *client;
-       unsigned long devid;
+       const struct mcp4531_cfg *cfg;
 };
 
 #define MCP4531_CHANNEL(ch) {                                  \
@@ -113,8 +113,8 @@ static int mcp4531_read_raw(struct iio_dev *indio_dev,
                *val = ret;
                return IIO_VAL_INT;
        case IIO_CHAN_INFO_SCALE:
-               *val = 1000 * mcp4531_cfg[data->devid].kohms;
-               *val2 = mcp4531_cfg[data->devid].max_pos;
+               *val = 1000 * data->cfg->kohms;
+               *val2 = data->cfg->max_pos;
                return IIO_VAL_FRACTIONAL;
        }
 
@@ -130,7 +130,7 @@ static int mcp4531_write_raw(struct iio_dev *indio_dev,
 
        switch (mask) {
        case IIO_CHAN_INFO_RAW:
-               if (val > mcp4531_cfg[data->devid].max_pos || val < 0)
+               if (val > data->cfg->max_pos || val < 0)
                        return -EINVAL;
                break;
        default:
@@ -152,7 +152,6 @@ static int mcp4531_probe(struct i2c_client *client,
                         const struct i2c_device_id *id)
 {
        struct device *dev = &client->dev;
-       unsigned long devid = id->driver_data;
        struct mcp4531_data *data;
        struct iio_dev *indio_dev;
 
@@ -168,12 +167,12 @@ static int mcp4531_probe(struct i2c_client *client,
        data = iio_priv(indio_dev);
        i2c_set_clientdata(client, indio_dev);
        data->client = client;
-       data->devid = devid;
+       data->cfg = &mcp4531_cfg[id->driver_data];
 
        indio_dev->dev.parent = dev;
        indio_dev->info = &mcp4531_info;
        indio_dev->channels = mcp4531_channels;
-       indio_dev->num_channels = mcp4531_cfg[devid].wipers;
+       indio_dev->num_channels = data->cfg->wipers;
        indio_dev->name = client->name;
 
        return devm_iio_device_register(dev, indio_dev);