summaryrefslogtreecommitdiff
path: root/include/linux/spi/ads7846.h
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /include/linux/spi/ads7846.h
Initial import
Diffstat (limited to 'include/linux/spi/ads7846.h')
-rw-r--r--include/linux/spi/ads7846.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h
new file mode 100644
index 000000000..2f694f384
--- /dev/null
+++ b/include/linux/spi/ads7846.h
@@ -0,0 +1,61 @@
+/* linux/spi/ads7846.h */
+
+/* Touchscreen characteristics vary between boards and models. The
+ * platform_data for the device's "struct device" holds this information.
+ *
+ * It's OK if the min/max values are zero.
+ */
+enum ads7846_filter {
+ ADS7846_FILTER_OK,
+ ADS7846_FILTER_REPEAT,
+ ADS7846_FILTER_IGNORE,
+};
+
+struct ads7846_platform_data {
+ u16 model; /* 7843, 7845, 7846, 7873. */
+ u16 vref_delay_usecs; /* 0 for external vref; etc */
+ u16 vref_mv; /* external vref value, milliVolts
+ * ads7846: if 0, use internal vref */
+ bool keep_vref_on; /* set to keep vref on for differential
+ * measurements as well */
+ bool swap_xy; /* swap x and y axes */
+
+ /* Settling time of the analog signals; a function of Vcc and the
+ * capacitance on the X/Y drivers. If set to non-zero, two samples
+ * are taken with settle_delay us apart, and the second one is used.
+ * ~150 uSec with 0.01uF caps.
+ */
+ u16 settle_delay_usecs;
+
+ /* If set to non-zero, after samples are taken this delay is applied
+ * and penirq is rechecked, to help avoid false events. This value
+ * is affected by the material used to build the touch layer.
+ */
+ u16 penirq_recheck_delay_usecs;
+
+ u16 x_plate_ohms;
+ u16 y_plate_ohms;
+
+ u16 x_min, x_max;
+ u16 y_min, y_max;
+ u16 pressure_min, pressure_max;
+
+ u16 debounce_max; /* max number of additional readings
+ * per sample */
+ u16 debounce_tol; /* tolerance used for filtering */
+ u16 debounce_rep; /* additional consecutive good readings
+ * required after the first two */
+ int gpio_pendown; /* the GPIO used to decide the pendown
+ * state if get_pendown_state == NULL */
+ int gpio_pendown_debounce; /* platform specific debounce time for
+ * the gpio_pendown */
+ int (*get_pendown_state)(void);
+ int (*filter_init) (const struct ads7846_platform_data *pdata,
+ void **filter_data);
+ int (*filter) (void *filter_data, int data_idx, int *val);
+ void (*filter_cleanup)(void *filter_data);
+ void (*wait_for_sync)(void);
+ bool wakeup;
+ unsigned long irq_flags;
+};
+