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authorMichael Hennerich <michael.hennerich@analog.com>2009-03-09 20:12:52 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-03-09 20:14:10 -0700
commitb4be468cc1e65110d9144751bf7079dad6f142b7 (patch)
tree7a27ea54cee5fc76f17ecbec26d98094c5aff994 /include
parent331b78ed300d9b37bd42dbc8b19f6277151a0dfa (diff)
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Input: add AD7879 Touchscreen driver
[randy.dunlap@oracle.com: don't use bus_id] [dtor@mail.ru: locking and other fixups] Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'include')
-rw-r--r--include/linux/spi/ad7879.h35
1 files changed, 35 insertions, 0 deletions
diff --git a/include/linux/spi/ad7879.h b/include/linux/spi/ad7879.h
new file mode 100644
index 00000000000..4231104c9af
--- /dev/null
+++ b/include/linux/spi/ad7879.h
@@ -0,0 +1,35 @@
+/* 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;
+
+ /* [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 set to GPIO Output */
+ u8 gpio_output;
+ /* Initial GPIO pin state (valid if gpio_output = 1) */
+ u8 gpio_default;
+};