Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / spi / ads7846.h

diff --git a/kernel/include/linux/spi/ads7846.h b/kernel/include/linux/spi/ads7846.h
new file mode 100644 (file)
index 0000000..2f694f3
--- /dev/null
+++ b/kernel/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;
+};
+