touchscreen.patch

linux环境下的触摸屏驱动！很好的范例！来之著名公司的代码

diff --git a/arch/arm/mach-s3c2410/devs.c b/arch/arm/mach-s3c2410/devs.c
index e55a6a9..9a2a67b 100644
--- a/arch/arm/mach-s3c2410/devs.c
+++ b/arch/arm/mach-s3c2410/devs.c
@@ -29,6 +29,7 @@ #include <asm/irq.h>
 
 #include <asm/arch/regs-serial.h>
 #include <asm/arch/udc.h>
+#include <asm/arch/ts.h>
 
 #include "devs.h"
 #include "cpu.h"
@@ -205,6 +206,23 @@ struct platform_device s3c_device_nand =
 
 EXPORT_SYMBOL(s3c_device_nand);
 
+/* Touchscreen */
+struct platform_device s3c_device_ts = {
+	.name		  = "s3c2410-ts",
+	.id		  = -1,
+};
+
+EXPORT_SYMBOL(s3c_device_ts);
+
+static struct s3c2410_ts_mach_info s3c2410ts_info;
+
+void __init set_s3c2410ts_info(struct s3c2410_ts_mach_info *hard_s3c2410ts_info)
+{
+	memcpy(&s3c2410ts_info,hard_s3c2410ts_info,sizeof(struct s3c2410_ts_mach_info));
+	s3c_device_ts.dev.platform_data = &s3c2410ts_info;
+}
+EXPORT_SYMBOL(set_s3c2410ts_info);
+
 /* USB Device (Gadget)*/
 
 static struct resource s3c_usbgadget_resource[] = {
diff --git a/arch/arm/mach-s3c2410/devs.h b/arch/arm/mach-s3c2410/devs.h
index 14fb0ba..0fc63cf 100644
--- a/arch/arm/mach-s3c2410/devs.h
+++ b/arch/arm/mach-s3c2410/devs.h
@@ -41,6 +41,7 @@ extern struct platform_device s3c_device
 extern struct platform_device s3c_device_timer3;
 
 extern struct platform_device s3c_device_usbgadget;
+extern struct platform_device s3c_device_ts;
 
 /* s3c2440 specific devices */
 
diff --git a/arch/arm/mach-s3c2410/mach-h1940.c b/arch/arm/mach-s3c2410/mach-h1940.c
index f539535..f65b7ce 100644
--- a/arch/arm/mach-s3c2410/mach-h1940.c
+++ b/arch/arm/mach-s3c2410/mach-h1940.c
@@ -39,6 +39,7 @@ #include <asm/arch/h1940.h>
 #include <asm/arch/h1940-latch.h>
 #include <asm/arch/fb.h>
 #include <asm/arch/udc.h>
+#include <asm/arch/ts.h>
 
 #include <linux/serial_core.h>
 
@@ -132,6 +133,11 @@ static struct s3c2410_udc_mach_info h194
 };
 
 
+static struct s3c2410_ts_mach_info h1940_ts_cfg __initdata = {
+		.delay = 10000,
+		.presc = 49,
+		.oversampling_shift = 2,
+};
 
 /**
  * Set lcd on or off
@@ -183,6 +189,7 @@ static struct platform_device *h1940_dev
 	&s3c_device_i2c,
 	&s3c_device_iis,
 	&s3c_device_usbgadget,
+	&s3c_device_ts,
 };
 
 static struct s3c24xx_board h1940_board __initdata = {
@@ -213,6 +220,7 @@ static void __init h1940_init(void)
 	u32 tmp;
 
 	s3c24xx_fb_set_platdata(&h1940_lcdcfg);
+	set_s3c2410ts_info(&h1940_ts_cfg);
  	s3c24xx_udc_set_platdata(&h1940_udc_cfg);
 
 	/* Turn off suspend on both USB ports, and switch the
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 6b46c9b..91f5f4f 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -49,6 +49,24 @@ config TOUCHSCREEN_CORGI
 	  To compile this driver as a module, choose M here: the
 	  module will be called corgi_ts.
 
+config TOUCHSCREEN_S3C2410
+	tristate "Samsung S3C2410 touchscreen input driver"
+	depends on ARCH_S3C2410 && INPUT && INPUT_TOUCHSCREEN
+	select SERIO
+	help
+	  Say Y here if you have the s3c2410 touchscreen.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called s3c2410_ts.
+
+config TOUCHSCREEN_S3C2410_DEBUG
+	boolean "Samsung S3C2410 touchscreen debug messages"
+	depends on TOUCHSCREEN_S3C2410
+	help
+	  Select this if you want debug messages
+
 config TOUCHSCREEN_GUNZE
 	tristate "Gunze AHL-51S touchscreen"
 	select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 30e6e22..8cbaac5 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -16,3 +16,4 @@ obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)	+= pe
 obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)	+= touchright.o
 obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)	+= touchwin.o
 obj-$(CONFIG_TOUCHSCREEN_UCB1400)	+= ucb1400_ts.o
+obj-$(CONFIG_TOUCHSCREEN_S3C2410)	+= s3c2410_ts.o
diff --git a/drivers/input/touchscreen/s3c2410_ts.c b/drivers/input/touchscreen/s3c2410_ts.c
new file mode 100644
index 0000000..0dea2ef
--- /dev/null
+++ b/drivers/input/touchscreen/s3c2410_ts.c
@@ -0,0 +1,401 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Copyright (c) 2004 Arnaud Patard <[e-mail]>
+ * iPAQ H1940 touchscreen support
+ *
+ * ChangeLog
+ *
+ * 2004-09-05: Herbert P枚tzl <[e-mail]>
+ *	- added clock (de-)allocation code
+ *
+ * 2005-03-06: Arnaud Patard <[e-mail]>
+ *      - h1940_ -> s3c2410 (this driver is now also used on the n30
+ *        machines :P)
+ *      - Debug messages are now enabled with the config option
+ *        TOUCHSCREEN_S3C2410_DEBUG
+ *      - Changed the way the value are read
+ *      - Input subsystem should now work
+ *      - Use ioremap and readl/writel
+ *
+ * 2005-03-23: Arnaud Patard <[e-mail]>
+ *      - Make use of some undocumented features of the touchscreen
+ *        controller
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/init.h>
+#include <linux/serio.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include <asm/arch/regs-adc.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/ts.h>
+
+/* For ts.dev.id.version */
+#define S3C2410TSVERSION	0x0101
+
+#define TSC_SLEEP  (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0))
+
+#define WAIT4INT(x)  (((x)<<8) | \
+		     S3C2410_ADCTSC_YM_SEN | S3C2410_ADCTSC_YP_SEN | S3C2410_ADCTSC_XP_SEN | \
+		     S3C2410_ADCTSC_XY_PST(3))
+
+#define AUTOPST	     (S3C2410_ADCTSC_YM_SEN | S3C2410_ADCTSC_YP_SEN | S3C2410_ADCTSC_XP_SEN | \
+		     S3C2410_ADCTSC_AUTO_PST | S3C2410_ADCTSC_XY_PST(0))
+
+#define DEBUG_LVL    KERN_DEBUG
+
+MODULE_AUTHOR("Arnaud Patard <[e-mail]>");
+MODULE_DESCRIPTION("s3c2410 touchscreen driver");
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+
+static char *s3c2410ts_name = "s3c2410 TouchScreen";
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct s3c2410ts {
+	struct input_dev *dev;
+	long xp;
+	long yp;
+	int count;
+	int shift;
+};
+
+static struct s3c2410ts ts;
+static void __iomem *base_addr;
+
+static inline void s3c2410_ts_connect(void)
+{
+	s3c2410_gpio_cfgpin(S3C2410_GPG12, S3C2410_GPG12_XMON);
+	s3c2410_gpio_cfgpin(S3C2410_GPG13, S3C2410_GPG13_nXPON);
+	s3c2410_gpio_cfgpin(S3C2410_GPG14, S3C2410_GPG14_YMON);
+	s3c2410_gpio_cfgpin(S3C2410_GPG15, S3C2410_GPG15_nYPON);
+}
+
+static void touch_timer_fire(unsigned long data)
+{
+  	unsigned long data0;
+  	unsigned long data1;
+	int updown;
+
+  	data0 = readl(base_addr+S3C2410_ADCDAT0);
+  	data1 = readl(base_addr+S3C2410_ADCDAT1);
+
+ 	updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT0_UPDOWN));
+
+ 	if (updown) {
+ 		if (ts.count != 0) {
+ 			ts.xp >>= ts.shift;
+ 			ts.yp >>= ts.shift;
+
+#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
+ 			{
+ 				struct timeval tv;
+ 				do_gettimeofday(&tv);
+ 				printk(DEBUG_LVL "T: %06d, X: %03ld, Y: %03ld\n", (int)tv.tv_usec, ts.xp, ts.yp);
+ 			}
+#endif
+
+ 			input_report_abs(ts.dev, ABS_X, ts.xp);
+ 			input_report_abs(ts.dev, ABS_Y, ts.yp);
+
+ 			input_report_key(ts.dev, BTN_TOUCH, 1);
+ 			input_report_abs(ts.dev, ABS_PRESSURE, 1);
+ 			input_sync(ts.dev);
+ 		}
+
+ 		ts.xp = 0;
+ 		ts.yp = 0;
+ 		ts.count = 0;
+
+ 		writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);
+ 		writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);
+ 	} else {
+ 		ts.count = 0;
+
+ 		input_report_key(ts.dev, BTN_TOUCH, 0);
+ 		input_report_abs(ts.dev, ABS_PRESSURE, 0);
+ 		input_sync(ts.dev);
+
+ 		writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
+ 	}
+}
+
+static struct timer_list touch_timer =
+		TIMER_INITIALIZER(touch_timer_fire, 0, 0);
+
+static irqreturn_t stylus_updown(int irq, void *dev_id)
+{
+	unsigned long data0;
+	unsigned long data1;