1/* linux/spi/ads7846.h */
2
3/* Touchscreen characteristics vary between boards and models.  The
4 * platform_data for the device's "struct device" holds this information.
5 *
6 * It's OK if the min/max values are zero.
7 */
8enum ads7846_filter {
9	ADS7846_FILTER_OK,
10	ADS7846_FILTER_REPEAT,
11	ADS7846_FILTER_IGNORE,
12};
13
14struct ads7846_platform_data {
15	u16	model;			/* 7843, 7845, 7846. */
16	u16	vref_delay_usecs;	/* 0 for external vref; etc */
17	int	keep_vref_on:1;		/* set to keep vref on for differential
18					 * measurements as well */
19	u16	x_plate_ohms;
20	u16	y_plate_ohms;
21
22	u16	x_min, x_max;
23	u16	y_min, y_max;
24	u16	pressure_min, pressure_max;
25
26	u16	debounce_max;		/* max number of additional readings
27					 * per sample */
28	u16	debounce_tol;		/* tolerance used for filtering */
29	u16	debounce_rep;		/* additional consecutive good readings
30					 * required after the first two */
31	int	(*get_pendown_state)(void);
32	int	(*filter_init)	(struct ads7846_platform_data *pdata,
33				 void **filter_data);
34	int	(*filter)	(void *filter_data, int data_idx, int *val);
35	void	(*filter_cleanup)(void *filter_data);
36};
37