input: touchscreen: Add Sitronix ST7123 touchscreen driver

Add a new I2C touchscreen controller driver for the Sitronix
ST7123 chip, organized as a multi-file module under
drivers/input/touchscreen/sitronix_st7123/.

The driver consists of:
- sitronix_ts.c: core touchscreen handling and initialization
- sitronix_ts_i2c.c: I2C bus interface layer
- sitronix_ts_mt.c: multi-touch reporting
- sitronix_ts_upgrade.c: firmware upgrade support
- sitronix_ts_utility.c: configuration and mode control

Supported features include multi-touch reporting, firmware upgrade,
and various operating modes (glove, charge suppression, palm
rejection, grip suppression).

The driver is built as a module (sitronix-st7123) and depends on
I2C and the input subsystem.

Signed-off-by: Waveshare_Team <support@waveshare.com>

Author: Waveshare_Team

drivers/input/touchscreen/Kconfig

@@ -1251,6 +1251,18 @@ config TOUCHSCREEN_SIS_I2C
 	  To compile this driver as a module, choose M here: the
 	  module will be called sis_i2c.
 
+config TOUCHSCREEN_ST7123
+	tristate "Sitronix ST7123 touchscreen controllers"
+	depends on I2C
+	help
+	  Say Y here if you want to support the Sitronix ST7123
+	  touchscreen controller.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called sitronix-st7123.
+	  
 config TOUCHSCREEN_ST1232
 	tristate "Sitronix ST1232 or ST1633 touchscreen controllers"
 	depends on I2C

drivers/input/touchscreen/Makefile

@@ -83,6 +83,7 @@ obj-$(CONFIG_TOUCHSCREEN_RM_TS)		+= raydium_i2c_ts.o
 obj-$(CONFIG_TOUCHSCREEN_S6SY761)	+= s6sy761.o
 obj-$(CONFIG_TOUCHSCREEN_SILEAD)	+= silead.o
 obj-$(CONFIG_TOUCHSCREEN_SIS_I2C)	+= sis_i2c.o
+obj-$(CONFIG_TOUCHSCREEN_ST7123)	+= sitronix_st7123/
 obj-$(CONFIG_TOUCHSCREEN_ST1232)	+= st1232.o
 obj-$(CONFIG_TOUCHSCREEN_STMFTS)	+= stmfts.o
 obj-$(CONFIG_TOUCHSCREEN_STMPE)		+= stmpe-ts.o

drivers/input/touchscreen/sitronix_st7123/Makefile

@@ -0,0 +1,4 @@
+
+sitronix-st7123-objs	= sitronix_ts.o sitronix_ts_i2c.o sitronix_ts_utility.o sitronix_ts_mt.o sitronix_ts_upgrade.o
+obj-m += sitronix-st7123.o
+

drivers/input/touchscreen/sitronix_st7123/sitronix_st7123.h

@@ -0,0 +1,51 @@
+
+
+#define ST_CHIPID		0x83
+
+
+/* common */
+#define ST_DISPLAY_DUMP_OFF		0x1D7FE
+#define ST_DISPLAY_SIZE			0x800
+
+/* flash */
+#define ST_FLASH_PAGE_SIZE		4096
+#define ST_FLASH_SIZE			0x20000
+#define ST_ICP_DISPLAY_FLASH_OFF	0x1D7FE
+
+/* ICP */
+#define ST_ADDR_MODE_I2C_ADDR		0x28
+
+/* HDL */
+#define ST_RAM_MODE_RETRY_MAX		3
+#define ST_FW_LEN					0x010000
+#define ST_HDL_PRAM_ADDR			0x7F0000
+#define ST_FW_LEN_PART2				0x002000
+#define ST_HDL_PRAM_ADDR_PART2		0x400000
+#define ST_HDL_URAM_ADDR			0x000000
+#define ST_HDL_DISPLAY_RAM_ADDR		0x030000
+
+/* IC register */
+#define ST_MISC_INFO_PROX_FLAG	0x20
+#define ST_MISC_INFO_COORD_CHKSUM_FLAG	0x10
+
+
+typedef enum {
+	ST_MODE_SWU		=	1,
+	ST_MODE_GLOVE		=	2,
+	ST_MODE_CHARGE		=	3,
+	ST_MODE_JITTERSUPPRESS	=	4,
+	ST_MODE_PALM		=	5,
+	ST_MODE_HEADPHONE	=	6,
+	ST_MODE_GRIP	=	7,
+	ST_MODE_SIZE		=	8,
+	ST_MODE_RESTORE_START	=	2,
+	ST_MODE_SWITCH_OFF	=	0,
+	ST_MODE_SWITCH_ON	=	0x80
+} SITRONIX_MODE_SWITCH;
+
+typedef enum {
+	ST_MODE_GRIP_ROTATE_0		=	0,
+	ST_MODE_GRIP_ROTATE_90		=	1,
+	ST_MODE_GRIP_ROTATE_180		=	2,
+	ST_MODE_GRIP_ROTATE_270		=	3,	
+} ST_MODE_GRIP_ROTATE_VALUE;