tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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