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

+	int updown;
+
+	data0 = readl(base_addr+S3C2410_ADCDAT0);
+	data1 = readl(base_addr+S3C2410_ADCDAT1);
+
+	updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT0_UPDOWN));
+
+	/* TODO we should never get an interrupt with updown set while
+	 * the timer is running, but maybe we ought to verify that the
+	 * timer isn't running anyways. */
+
+	if (updown)
+		touch_timer_fire(0);
+
+	return IRQ_HANDLED;
+}
+
+
+static irqreturn_t stylus_action(int irq, void *dev_id)
+{
+	unsigned long data0;
+	unsigned long data1;
+
+	data0 = readl(base_addr+S3C2410_ADCDAT0);
+	data1 = readl(base_addr+S3C2410_ADCDAT1);
+
+	ts.xp += data0 & S3C2410_ADCDAT0_XPDATA_MASK;
+	ts.yp += data1 & S3C2410_ADCDAT1_YPDATA_MASK;
+	ts.count++;
+
+        if (ts.count < (1<<ts.shift)) {
+		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 {
+		mod_timer(&touch_timer, jiffies+1);
+		writel(WAIT4INT(1), base_addr+S3C2410_ADCTSC);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static struct clk	*adc_clock;
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init s3c2410ts_probe(struct platform_device *pdev)
+{
+	struct s3c2410_ts_mach_info *info;
+	struct input_dev *input_dev;
+
+	info = ( struct s3c2410_ts_mach_info *)pdev->dev.platform_data;
+
+	if (!info)
+	{
+		printk(KERN_ERR "Hm... too bad : no platform data for ts\n");
+		return -EINVAL;
+	}
+
+#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
+	printk(DEBUG_LVL "Entering s3c2410ts_init\n");
+#endif
+
+	adc_clock = clk_get(NULL, "adc");
+	if (!adc_clock) {
+		printk(KERN_ERR "failed to get adc clock source\n");
+		return -ENOENT;
+	}
+	clk_enable(adc_clock);
+
+#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
+	printk(DEBUG_LVL "got and enabled clock\n");
+#endif
+
+	base_addr=ioremap(S3C2410_PA_ADC,0x20);
+	if (base_addr == NULL) {
+		printk(KERN_ERR "Failed to remap register block\n");
+		return -ENOMEM;
+	}
+
+
+	/* Configure GPIOs */
+	s3c2410_ts_connect();
+
+	if ((info->presc&0xff) > 0)
+		writel(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(info->presc&0xFF),\
+			     base_addr+S3C2410_ADCCON);
+	else
+		writel(0,base_addr+S3C2410_ADCCON);
+
+
+	/* Initialise registers */
+	if ((info->delay&0xffff) > 0)
+		writel(info->delay & 0xffff,  base_addr+S3C2410_ADCDLY);
+
+	writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
+
+	/* Initialise input stuff */
+	memset(&ts, 0, sizeof(struct s3c2410ts));
+	input_dev = input_allocate_device();
+
+	if (!input_dev) {
+		printk(KERN_ERR "Unable to allocate the input device !!\n");
+		return -ENOMEM;
+	}
+
+	ts.dev = input_dev;
+	ts.dev->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
+	ts.dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+	input_set_abs_params(ts.dev, ABS_X, 0, 0x3FF, 0, 0);
+	input_set_abs_params(ts.dev, ABS_Y, 0, 0x3FF, 0, 0);
+	input_set_abs_params(ts.dev, ABS_PRESSURE, 0, 1, 0, 0);
+
+	ts.dev->private = &ts;
+	ts.dev->name = s3c2410ts_name;
+	ts.dev->id.bustype = BUS_RS232;
+	ts.dev->id.vendor = 0xDEAD;
+	ts.dev->id.product = 0xBEEF;
+	ts.dev->id.version = S3C2410TSVERSION;
+
+	ts.shift = info->oversampling_shift;
+
+	/* Get irqs */
+	if (request_irq(IRQ_ADC, stylus_action, IRQF_SAMPLE_RANDOM,
+		"s3c2410_action", ts.dev)) {
+		printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_ADC !\n");
+		iounmap(base_addr);
+		return -EIO;
+	}
+	if (request_irq(IRQ_TC, stylus_updown, IRQF_SAMPLE_RANDOM,
+			"s3c2410_action", ts.dev)) {
+		printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_TC !\n");
+		iounmap(base_addr);
+		return -EIO;
+	}
+
+	printk(KERN_INFO "%s successfully loaded\n", s3c2410ts_name);
+
+	/* All went ok, so register to the input system */
+	input_register_device(ts.dev);
+
+	return 0;
+}
+
+static int s3c2410ts_remove(struct platform_device *pdev)
+{
+	disable_irq(IRQ_ADC);
+	disable_irq(IRQ_TC);
+	free_irq(IRQ_TC,ts.dev);
+	free_irq(IRQ_ADC,ts.dev);
+
+	if (adc_clock) {
+		clk_disable(adc_clock);
+		clk_put(adc_clock);
+		adc_clock = NULL;
+	}
+
+	input_unregister_device(ts.dev);
+	iounmap(base_addr);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int s3c2410ts_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	writel(TSC_SLEEP, base_addr+S3C2410_ADCTSC);
+	writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_STDBM,
+	       base_addr+S3C2410_ADCCON);
+
+	disable_irq(IRQ_ADC);
+	disable_irq(IRQ_TC);
+
+	clk_disable(adc_clock);
+
+	return 0;
+}
+
+static int s3c2410ts_resume(struct platform_device *pdev)
+{
+	struct s3c2410_ts_mach_info *info =
+		( struct s3c2410_ts_mach_info *)pdev->dev.platform_data;
+
+	clk_enable(adc_clock);
+	msleep(1);
+
+	enable_irq(IRQ_ADC);
+	enable_irq(IRQ_TC);
+
+	if ((info->presc&0xff) > 0)
+		writel(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(info->presc&0xFF),\
+			     base_addr+S3C2410_ADCCON);
+	else
+		writel(0,base_addr+S3C2410_ADCCON);
+
+	/* Initialise registers */
+	if ((info->delay&0xffff) > 0)
+		writel(info->delay & 0xffff,  base_addr+S3C2410_ADCDLY);
+
+	writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
+
+	return 0;
+}
+
+#else
+#define s3c2410ts_suspend NULL
+#define s3c2410ts_resume  NULL
+#endif
+
+static struct platform_driver s3c2410ts_driver = {
+       .driver         = {
+	       .name   = "s3c2410-ts",
+	       .owner  = THIS_MODULE,
+       },
+       .probe          = s3c2410ts_probe,
+       .remove         = s3c2410ts_remove,
+       .suspend        = s3c2410ts_suspend,
+       .resume         = s3c2410ts_resume,
+
+};
+
+
+static int __init s3c2410ts_init(void)
+{
+	return platform_driver_register(&s3c2410ts_driver);
+}
+
+static void __exit s3c2410ts_exit(void)
+{
+	platform_driver_unregister(&s3c2410ts_driver);
+}
+
+module_init(s3c2410ts_init);
+module_exit(s3c2410ts_exit);
+
+/*
+    Local variables:
+        compile-command: "make ARCH=arm CROSS_COMPILE=/usr/local/arm/3.3.2/bin/arm-linux- -k -C ../../.."
+        c-basic-offset: 8
+    End:
+*/
diff --git a/include/asm-arm/arch-s3c2410/regs-adc.h b/include/asm-arm/arch-s3c2410/regs-adc.h
index 3196a28..c7f2319 100644
--- a/include/asm-arm/arch-s3c2410/regs-adc.h
+++ b/include/asm-arm/arch-s3c2410/regs-adc.h
@@ -41,7 +41,7 @@ #define S3C2410_ADCTSC_XM_SEN		(1<<5)
 #define S3C2410_ADCTSC_XP_SEN		(1<<4)
 #define S3C2410_ADCTSC_PULL_UP_DISABLE	(1<<3)
 #define S3C2410_ADCTSC_AUTO_PST		(1<<2)
-#define S3C2410_ADCTSC_XY_PST		(0x3<<0)
+#define S3C2410_ADCTSC_XY_PST(x)	(((x)&0x3)<<0)
 
 /* ADCDAT0 Bits */
 #define S3C2410_ADCDAT0_UPDOWN		(1<<15)
diff --git a/include/asm-arm/arch-s3c2410/ts.h b/include/asm-arm/arch-s3c2410/ts.h
new file mode 100644
index 0000000..8566f25
--- /dev/null
+++ b/include/asm-arm/arch-s3c2410/ts.h
@@ -0,0 +1,28 @@
+/* linux/include/asm/arch-s3c2410/ts.h
+ *
+ * Copyright (c) 2005 Arnaud Patard <[e-mail]>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *
+ *  Changelog:
+ *     24-Mar-2005     RTP     Created file
+ *     03-Aug-2005     RTP     Renamed to ts.h
+ */
+
+#ifndef __ASM_ARM_TS_H
+#define __ASM_ARM_TS_H
+
+struct s3c2410_ts_mach_info {
+       int             delay;
+       int             presc;
+       int             oversampling_shift;
+};
+
+void __init set_s3c2410ts_info(struct s3c2410_ts_mach_info *hard_s3c2410ts_info);
+
+#endif /* __ASM_ARM_TS_H */
+