SPI: TSC2046 touchscreen support

This is a rework of the tsc2046 driver from TI's tree, based
on the tsc2301 driver and using the new SPI framework.
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/input/touchscreen/Kconfig

@@ -165,4 +165,10 @@ config TOUCHSCREEN_TSC2301
 	help
 	  Say Y here for if you are using the touchscreen features of TSC2301.
 
+config TOUCHSCREEN_TSC2046
+	tristate "TSC2046 touchscreen support"
+	default MACH_OMAP2430SDP
+	  help
+	  Say Y here for if you are using the touchscreen features of TSC2046
+
 endif

drivers/input/touchscreen/Makefile

@@ -19,3 +19,4 @@ obj-$(CONFIG_TOUCHSCREEN_UCB1400)	+= ucb1400_ts.o
 obj-$(CONFIG_TOUCHSCREEN_TSC2102)	+= tsc2102_ts.o
 obj-$(CONFIG_TOUCHSCREEN_OMAP)	+= omap/
 obj-$(CONFIG_TOUCHSCREEN_TSC2301)	+= tsc2301_ts.o
+obj-$(CONFIG_TOUCHSCREEN_TSC2046)	+= tsc2046_ts.o

include/linux/spi/tsc2046.h

+#ifndef _LINUX_SPI_TSC2046_H
+#define _LINUX_SPI_TSC2046_H
+
+#include <linux/types.h>
+#include <linux/timer.h>
+
+struct tsc2046_platform_data {
+	s16	dav_gpio;
+	s16	gpio_debounce;
+	u16	ts_x_plate_ohm;
+	u32	ts_max_pressure;  /* Samples with bigger pressure value will
+				     be ignored, since the corresponding X, Y
+				     values are unreliable */
+	u32	ts_touch_pressure;/* Pressure limit until we report a
+				     touch event. After that we switch
+				     to ts_max_pressure. */
+	unsigned ts_ignore_last : 1;
+
+};
+
+struct tsc2046_ts;
+
+struct tsc2046 {
+	struct spi_device	*spi;
+	int                     gpio;
+
+	struct tsc2046_ts	*ts;
+};
+
+/* The TSC2046 operates at a maximum speed of 2MHz */
+#define TSC2046_HZ	2000000
+
+#define TSC2046_DECL_MOD(module)					\
+extern int  tsc2046_##module##_init(struct tsc2046 *tsc,		\
+			   struct tsc2046_platform_data *pdata);	\
+extern void tsc2046_##module##_exit(struct tsc2046 *tsc);		\
+extern int  tsc2046_##module##_suspend(struct tsc2046 *tsc);		\
+extern void tsc2046_##module##_resume(struct tsc2046 *tsc);
+
+#define TSC2046_DECL_EMPTY_MOD(module)					\
+static inline int tsc2046_##module##_init(struct tsc2046 *tsc,		\
+			   struct tsc2046_platform_data *pdata)		\
+{									\
+	return 0;							\
+}									\
+static inline void tsc2046_##module##_exit(struct tsc2046 *tsc) {}	\
+static inline int  tsc2046_##module##_suspend(struct tsc2046 *tsc)	\
+{									\
+	return 0;							\
+}									\
+static inline void tsc2046_##module##_resume(struct tsc2046 *tsc) {}
+
+#if defined(CONFIG_TOUCHSCREEN_TSC2046) || \
+    defined(CONFIG_TOUCHSCREEN_TSC2046_MODULE)
+TSC2046_DECL_MOD(ts)
+#else
+TSC2046_DECL_EMPTY_MOD(ts)
+#endif
+
+#endif