Input: ads7846 - make sure we do not change platform data

Let's declare platform data a const pointer so that we don't accitentally
change it. Also fetch it with dev_get_platdata().

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 84ccf14..5ff0419 100644 (file)
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -961,9 +961,9 @@ static int ads7846_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(ads7846_pm, ads7846_suspend, ads7846_resume);
 
 static int ads7846_setup_pendown(struct spi_device *spi,
-                                          struct ads7846 *ts)
+                                struct ads7846 *ts,
+                                const struct ads7846_platform_data *pdata)
 {
-       struct ads7846_platform_data *pdata = spi->dev.platform_data;
        int err;
 
        /*
@@ -1003,7 +1003,7 @@ static int ads7846_setup_pendown(struct spi_device *spi,
  * use formula #2 for pressure, not #3.
  */
 static void ads7846_setup_spi_msg(struct ads7846 *ts,
-                               const struct ads7846_platform_data *pdata)
+                                 const struct ads7846_platform_data *pdata)
 {
        struct spi_message *m = &ts->msg[0];
        struct spi_transfer *x = ts->xfer;
@@ -1203,10 +1203,10 @@ static void ads7846_setup_spi_msg(struct ads7846 *ts,
 
 static int ads7846_probe(struct spi_device *spi)
 {
+       const struct ads7846_platform_data *pdata = dev_get_platdata(&spi->dev);
        struct ads7846 *ts;
        struct ads7846_packet *packet;
        struct input_dev *input_dev;
-       struct ads7846_platform_data *pdata = spi->dev.platform_data;
        unsigned long irq_flags;
        int err;
 
@@ -1281,7 +1281,7 @@ static int ads7846_probe(struct spi_device *spi)
                ts->filter = ads7846_no_filter;
        }
 
-       err = ads7846_setup_pendown(spi, ts);
+       err = ads7846_setup_pendown(spi, ts, pdata);
        if (err)
                goto err_cleanup_filter;