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, 7873. */
16	u16	vref_delay_usecs;	/* 0 for external vref; etc */
17	u16	vref_mv;		/* external vref value, milliVolts
18					 * ads7846: if 0, use internal vref */
19	bool	keep_vref_on;		/* set to keep vref on for differential
20					 * measurements as well */
21	bool	swap_xy;		/* swap x and y axes */
22
23	/* Settling time of the analog signals; a function of Vcc and the
24	 * capacitance on the X/Y drivers.  If set to non-zero, two samples
25	 * are taken with settle_delay us apart, and the second one is used.
26	 * ~150 uSec with 0.01uF caps.
27	 */
28	u16	settle_delay_usecs;
29
30	/* If set to non-zero, after samples are taken this delay is applied
31	 * and penirq is rechecked, to help avoid false events.  This value
32	 * is affected by the material used to build the touch layer.
33	 */
34	u16	penirq_recheck_delay_usecs;
35
36	u16	x_plate_ohms;
37	u16	y_plate_ohms;
38
39	u16	x_min, x_max;
40	u16	y_min, y_max;
41	u16	pressure_min, pressure_max;
42
43	u16	debounce_max;		/* max number of additional readings
44					 * per sample */
45	u16	debounce_tol;		/* tolerance used for filtering */
46	u16	debounce_rep;		/* additional consecutive good readings
47					 * required after the first two */
48	int	gpio_pendown;		/* the GPIO used to decide the pendown
49					 * state if get_pendown_state == NULL */
50	int	gpio_pendown_debounce;	/* platform specific debounce time for
51					 * the gpio_pendown */
52	int	(*get_pendown_state)(void);
53	int	(*filter_init)	(const struct ads7846_platform_data *pdata,
54				 void **filter_data);
55	int	(*filter)	(void *filter_data, int data_idx, int *val);
56	void	(*filter_cleanup)(void *filter_data);
57	void	(*wait_for_sync)(void);
58	bool	wakeup;
59	unsigned long irq_flags;
60};
61
62