[PATCH 1/1] tsc2007: Cancel work sync, increase polling frequency, make exit platform hw callback optional

["Richard Röjfors" <richard.rojfors.ext@mocean-labs.com>]

In the remove function, ancel the work using the _sync version,
to make sure any running "work" is finished. Make the
exit_platform_hw callback optional since it's not needed on all
platforms.

When the screen is touched, the polling frequency is increased
to reduce the risk of missing taps.

Signed-off-by: Richard Röjfors <richard.rojfors.ext@mocean-labs.com>
---
Index: linux-2.6.30/drivers/input/touchscreen/tsc2007.c
===================================================================
--- linux-2.6.30/drivers/input/touchscreen/tsc2007.c	(revision 945)
+++ linux-2.6.30/drivers/input/touchscreen/tsc2007.c	(revision 999)
@@ -27,7 +27,7 @@
  #include <linux/i2c.h>
  #include <linux/i2c/tsc2007.h>

-#define TS_POLL_PERIOD	msecs_to_jiffies(5) /* ms delay between samples */
+#define TS_POLL_PERIOD	msecs_to_jiffies(1) /* ms delay between samples */

  #define TSC2007_MEASURE_TEMP0		(0x0 << 4)
  #define TSC2007_MEASURE_AUX		(0x2 << 4)
@@ -332,11 +332,11 @@
  	struct tsc2007	*ts = i2c_get_clientdata(client);
  	struct tsc2007_platform_data *pdata;

-	/* cancel any work */
-	cancel_delayed_work(&ts->work);
+	cancel_delayed_work_sync(&ts->work);

  	pdata = client->dev.platform_data;
-	pdata->exit_platform_hw();
+	if (pdata->exit_platform_hw)
+		pdata->exit_platform_hw();

  	free_irq(ts->irq, ts);
  	input_unregister_device(ts->input);