Input: tsc2007 - add poll_delay parameter to platform data

Depending on the quality of the touch panel, the time for the X-, X+, Y-
and Y+ inputs to settle may vary. The poll_delay parameter can be used
to override the default of 1 millisecond.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Kwangwoo Lee <kwangwoo.lee@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/touchscreen/tsc2007.c

@@ -27,7 +27,6 @@
 #include <linux/i2c.h>
 #include <linux/i2c/tsc2007.h>
 
-#define TS_POLL_DELAY			1 /* ms delay between samples */
 #define TS_POLL_PERIOD			1 /* ms delay between samples */
 
 #define TSC2007_MEASURE_TEMP0		(0x0 << 4)
@@ -76,6 +75,7 @@ struct tsc2007 {
 	u16			model;
 	u16			x_plate_ohms;
 	u16			max_rt;
+	unsigned long		poll_delay;
 
 	bool			pendown;
 	int			irq;
@@ -242,7 +242,7 @@ static irqreturn_t tsc2007_irq(int irq, void *handle)
 	if (!ts->get_pendown_state || likely(ts->get_pendown_state())) {
 		disable_irq_nosync(ts->irq);
 		schedule_delayed_work(&ts->work,
-				      msecs_to_jiffies(TS_POLL_DELAY));
+				      msecs_to_jiffies(ts->poll_delay));
 	}
 
 	if (ts->clear_penirq)
@@ -296,6 +296,7 @@ static int __devinit tsc2007_probe(struct i2c_client *client,
 	ts->model             = pdata->model;
 	ts->x_plate_ohms      = pdata->x_plate_ohms;
 	ts->max_rt            = pdata->max_rt ? : MAX_12BIT;
+	ts->poll_delay        = pdata->poll_delay ? : 1;
 	ts->get_pendown_state = pdata->get_pendown_state;
 	ts->clear_penirq      = pdata->clear_penirq;
 

include/linux/i2c/tsc2007.h

@@ -7,6 +7,8 @@ struct tsc2007_platform_data {
 	u16	model;				/* 2007. */
 	u16	x_plate_ohms;
 	u16	max_rt; /* max. resistance above which samples are ignored */
+	unsigned long poll_delay; /* delay (in ms) after pen-down event
+				     before polling starts */
 
 	int	(*get_pendown_state)(void);
 	void	(*clear_penirq)(void);		/* If needed, clear 2nd level