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>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 84ccf140c1bb..5ff041995198 100644
--- 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;