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Diffstat (limited to 'include/linux/spi/ad7879.h')
-rw-r--r--include/linux/spi/ad7879.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/include/linux/spi/ad7879.h b/include/linux/spi/ad7879.h
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index 000000000..58368be0b
--- /dev/null
+++ b/include/linux/spi/ad7879.h
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+/* linux/spi/ad7879.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.
+ */
+struct ad7879_platform_data {
+ u16 model; /* 7879 */
+ u16 x_plate_ohms;
+ u16 x_min, x_max;
+ u16 y_min, y_max;
+ u16 pressure_min, pressure_max;
+
+ bool swap_xy; /* swap x and y axes */
+
+ /* [0..255] 0=OFF Starts at 1=550us and goes
+ * all the way to 9.440ms in steps of 35us.
+ */
+ u8 pen_down_acc_interval;
+ /* [0..15] Starts at 0=128us and goes all the
+ * way to 4.096ms in steps of 128us.
+ */
+ u8 first_conversion_delay;
+ /* [0..3] 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */
+ u8 acquisition_time;
+ /* [0..3] Average X middle samples 0 = 2, 1 = 4, 2 = 8, 3 = 16 */
+ u8 averaging;
+ /* [0..3] Perform X measurements 0 = OFF,
+ * 1 = 4, 2 = 8, 3 = 16 (median > averaging)
+ */
+ u8 median;
+ /* 1 = AUX/VBAT/GPIO export GPIO to gpiolib
+ * requires CONFIG_GPIOLIB
+ */
+ bool gpio_export;
+ /* identifies the first GPIO number handled by this chip;
+ * or, if negative, requests dynamic ID allocation.
+ */
+ s32 gpio_base;
+};