check in the original version of dde linux26.

1 files changed, 55 insertions, 0 deletions

diff --git a/libdde_linux26/contrib/include/linux/spi/ads7846.h b/libdde_linux26/contrib/include/linux/spi/ads7846.h
new file mode 100644
index 00000000..05eab2f1
--- /dev/null
+++ b/libdde_linux26/contrib/include/linux/spi/ads7846.h
@@ -0,0 +1,55 @@
+/* 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. */
+	u16	vref_delay_usecs;	/* 0 for external vref; etc */
+	u16	vref_mv;		/* external vref value, milliVolts */
+	bool	keep_vref_on;		/* set to keep vref on for differential
+					 * measurements as well */
+
+	/* 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	(*get_pendown_state)(void);
+	int	(*filter_init)	(struct ads7846_platform_data *pdata,
+				 void **filter_data);
+	int	(*filter)	(void *filter_data, int data_idx, int *val);
+	void	(*filter_cleanup)(void *filter_data);
+};
+