1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* linux/spi/ads7846.h */ 2 /* linux/spi/ads7846.h */
3 3
>> 4 /* Touchscreen characteristics vary between boards and models. The
>> 5 * platform_data for the device's "struct device" holds this information.
>> 6 *
>> 7 * It's OK if the min/max values are zero.
>> 8 */
>> 9 enum ads7846_filter {
>> 10 ADS7846_FILTER_OK,
>> 11 ADS7846_FILTER_REPEAT,
>> 12 ADS7846_FILTER_IGNORE,
>> 13 };
>> 14
4 struct ads7846_platform_data { 15 struct ads7846_platform_data {
5 u16 model; /* 784 16 u16 model; /* 7843, 7845, 7846, 7873. */
6 u16 vref_delay_usecs; /* 0 f 17 u16 vref_delay_usecs; /* 0 for external vref; etc */
7 u16 vref_mv; /* ext 18 u16 vref_mv; /* external vref value, milliVolts
8 * ads 19 * ads7846: if 0, use internal vref */
9 bool keep_vref_on; /* set 20 bool keep_vref_on; /* set to keep vref on for differential
10 * mea 21 * measurements as well */
11 bool swap_xy; /* swa 22 bool swap_xy; /* swap x and y axes */
12 23
13 /* Settling time of the analog signals 24 /* Settling time of the analog signals; a function of Vcc and the
14 * capacitance on the X/Y drivers. If 25 * capacitance on the X/Y drivers. If set to non-zero, two samples
15 * are taken with settle_delay us apar 26 * are taken with settle_delay us apart, and the second one is used.
16 * ~150 uSec with 0.01uF caps. 27 * ~150 uSec with 0.01uF caps.
17 */ 28 */
18 u16 settle_delay_usecs; 29 u16 settle_delay_usecs;
19 30
20 /* If set to non-zero, after samples a 31 /* If set to non-zero, after samples are taken this delay is applied
21 * and penirq is rechecked, to help av 32 * and penirq is rechecked, to help avoid false events. This value
22 * is affected by the material used to 33 * is affected by the material used to build the touch layer.
23 */ 34 */
24 u16 penirq_recheck_delay_usecs; 35 u16 penirq_recheck_delay_usecs;
25 36
26 u16 x_plate_ohms; 37 u16 x_plate_ohms;
27 u16 y_plate_ohms; 38 u16 y_plate_ohms;
28 39
29 u16 x_min, x_max; 40 u16 x_min, x_max;
30 u16 y_min, y_max; 41 u16 y_min, y_max;
31 u16 pressure_min, pressure_max; 42 u16 pressure_min, pressure_max;
32 43
33 u16 debounce_max; /* max 44 u16 debounce_max; /* max number of additional readings
34 * per 45 * per sample */
35 u16 debounce_tol; /* tol 46 u16 debounce_tol; /* tolerance used for filtering */
36 u16 debounce_rep; /* add 47 u16 debounce_rep; /* additional consecutive good readings
37 * req 48 * required after the first two */
>> 49 int gpio_pendown; /* the GPIO used to decide the pendown
>> 50 * state if get_pendown_state == NULL */
38 int gpio_pendown_debounce; /* pla 51 int gpio_pendown_debounce; /* platform specific debounce time for
39 * the 52 * the gpio_pendown */
40 int (*get_pendown_state)(void); 53 int (*get_pendown_state)(void);
>> 54 int (*filter_init) (const struct ads7846_platform_data *pdata,
>> 55 void **filter_data);
>> 56 int (*filter) (void *filter_data, int data_idx, int *val);
>> 57 void (*filter_cleanup)(void *filter_data);
41 void (*wait_for_sync)(void); 58 void (*wait_for_sync)(void);
42 bool wakeup; 59 bool wakeup;
43 unsigned long irq_flags; 60 unsigned long irq_flags;
44 }; 61 };
45 62
46 63
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