staging:iio:ad7192: Remove unused platform_data from device state struct

The platform data for the device is only used from within the drivers probe
callback, so there is no need to keep it around in the devices state struct.

While we are at it mark the platform data struct as const.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
index 405d9a8d7b6db1082cbba722997247509863c2f1..cdb4fc4ef8205ed3d9ca5d79ea754ee6905b33a9 100644 (file)
--- a/drivers/staging/iio/adc/ad7192.c
+++ b/drivers/staging/iio/adc/ad7192.c
@@ -136,7 +136,6 @@ struct ad7192_state {
        struct spi_device               *spi;
        struct iio_trigger              *trig;
        struct regulator                *reg;
-       struct ad7192_platform_data     *pdata;
        wait_queue_head_t               wq_data_avail;
        bool                            done;
        bool                            irq_dis;
@@ -347,10 +346,10 @@ out:
        return ret;
 }
 
-static int ad7192_setup(struct ad7192_state *st)
+static int ad7192_setup(struct ad7192_state *st,
+       const struct ad7192_platform_data *pdata)
 {
        struct iio_dev *indio_dev = spi_get_drvdata(st->spi);
-       struct ad7192_platform_data *pdata = st->pdata;
        unsigned long long scale_uv;
        int i, ret, id;
        u8 ones[6];
@@ -985,7 +984,7 @@ static const struct iio_chan_spec ad7192_channels[] = {
 
 static int __devinit ad7192_probe(struct spi_device *spi)
 {
-       struct ad7192_platform_data *pdata = spi->dev.platform_data;
+       const struct ad7192_platform_data *pdata = spi->dev.platform_data;
        struct ad7192_state *st;
        struct iio_dev *indio_dev;
        int ret , voltage_uv = 0;
@@ -1015,8 +1014,6 @@ static int __devinit ad7192_probe(struct spi_device *spi)
                voltage_uv = regulator_get_voltage(st->reg);
        }
 
-       st->pdata = pdata;
-
        if (pdata && pdata->vref_mv)
                st->int_vref_mv = pdata->vref_mv;
        else if (voltage_uv)
@@ -1047,7 +1044,7 @@ static int __devinit ad7192_probe(struct spi_device *spi)
        if (ret)
                goto error_ring_cleanup;
 
-       ret = ad7192_setup(st);
+       ret = ad7192_setup(st, pdata);
        if (ret)
                goto error_remove_trigger;