五一放假三天，本来打算把Qt移植完成的，在移植液晶屏触屏驱动花费了不少时间，参考网上资料大部分都是mini2440官方提供方法，笔者看到linux2.6.38版本已经有了触屏驱动的支持，因此从网上复制linux2.6.38的s3c2410_ts.c作为模板进行移植。1，在drivers/input/touchscreen添加s3c2410_ts.c内容如下/* * Samsung S3C24XX touchscreen driver * * This program is free software; you can redistribute it and/or modify * it under the term 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 2004 Arnaud Patard <arnaud.patard@rtp-net.org> * Copyright 2008 Ben Dooks <ben-linux@fluff.org> * Copyright 2009 Simtec Electronics <linux@simtec.co.uk> * * Additional work by Herbert P枚tzl <herbert@13thfloor.at> and * Harald Welte <laforge@openmoko.org> */#include <linux/errno.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/gpio.h>#include <linux/input.h>#include <linux/init.h>#include <linux/delay.h>#include <linux/interrupt.h>#include <linux/platform_device.h>#include <linux/clk.h>#include <linux/io.h>#include <plat/adc.h>#include <plat/regs-adc.h>#include <plat/ts.h>#define TSC_SLEEP (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0))#define INT_DOWN (0)#define INT_UP (1 << 8)#define WAIT4INT (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 FEAT_PEN_IRQ (1 << 0) /* HAS ADCCLRINTPNDNUP *//* Per-touchscreen data. *//** * struct s3c2410ts - driver touchscreen state. * @client: The ADC client we registered with the core driver. * @dev: The device we are bound to. * @input: The input device we registered with the input subsystem. * @clock: The clock for the adc. * @io: Pointer to the IO base. * @xp: The accumulated X position data. * @yp: The accumulated Y position data. * @irq_tc: The interrupt number for pen up/down interrupt * @count: The number of samples collected. * @shift: The log2 of the maximum count to read in one go. * @features: The features supported by the TSADC MOdule. */struct s3c2410ts { struct s3c_adc_client *client; struct device *dev; struct input_dev *input; struct clk *clock; void __iomem *io; unsigned long xp; unsigned long yp; int irq_tc; int count; int shift; int features;};static struct s3c2410ts ts;/** * get_down - return the down state of the pen * @data0: The data read from ADCDAT0 register. * @data1: The data read from ADCDAT1 register. * * Return non-zero if both readings show that the pen is down. */static inline bool get_down(unsigned long data0, unsigned long data1){ /* returns true if both data values show stylus down */ return (!(data0 & S3C2410_ADCDAT0_UPDOWN) && !(data1 & S3C2410_ADCDAT0_UPDOWN));}static void touch_timer_fire(unsigned long data){ unsigned long data0; unsigned long data1; bool down; data0 = readl(ts.io + S3C2410_ADCDAT0); data1 = readl(ts.io + S3C2410_ADCDAT1); down = get_down(data0, data1); if (down) { if (ts.count == (1 << ts.shift)) { ts.xp >>= ts.shift; ts.yp >>= ts.shift; dev_dbg(ts.dev, "%s: X=%lu, Y=%lu, count=%d\n", __func__, ts.xp, ts.yp, ts.count); input_report_abs(ts.input, ABS_X, ts.xp); input_report_abs(ts.input, ABS_Y, ts.yp); input_report_key(ts.input, BTN_TOUCH, 1); input_report_abs(ts.input, ABS_PRESSURE, 1); input_sync(ts.input); ts.xp = 0; ts.yp = 0; ts.count = 0; } s3c_adc_start(ts.client, 0, 1 << ts.shift); } else { ts.xp = 0; ts.yp = 0; ts.count = 0; input_report_key(ts.input, BTN_TOUCH, 0); input_report_abs(ts.input, ABS_PRESSURE, 0); input_sync(ts.input); writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC); }}static DEFINE_TIMER(touch_timer, touch_timer_fire, 0, 0);/** * stylus_irq - touchscreen stylus event interrupt * @irq: The interrupt number * @dev_id: The device ID. * * Called when the IRQ_TC is fired for a pen up or down event. */static irqreturn_t stylus_irq(int irq, void *dev_id){ unsigned long data0; unsigned long data1; bool down; data0 = readl(ts.io + S3C2410_ADCDAT0); data1 = readl(ts.io + S3C2410_ADCDAT1); down = get_down(data0, data1); /* TODO we should never get an interrupt with down set while * the timer is running, but maybe we ought to verify that the * timer isn't running anyways. */ if (down) s3c_adc_start(ts.client, 0, 1 << ts.shift); else dev_dbg(ts.dev, "%s: count=%d\n", __func__, ts.count); if (ts.features & FEAT_PEN_IRQ) { /* Clear pen down/up interrupt */ //writel(0x0, ts.io + S3C64XX_ADCCLRINTPNDNUP); } return IRQ_HANDLED;}/** * s3c24xx_ts_conversion - ADC conversion callback * @client: The client that was registered with the ADC core. * @data0: The reading from ADCDAT0. * @data1: The reading from ADCDAT1. * @left: The number of samples left. * * Called when a conversion has finished. */static void s3c24xx_ts_conversion(struct s3c_adc_client *client, unsigned data0, unsigned data1, unsigned *left){ dev_dbg(ts.dev, "%s: %d,%d\n", __func__, data0, data1); ts.xp += data0; ts.yp += data1; ts.count++; /* From tests, it seems that it is unlikely to get a pen-up * event during the conversion process which means we can * ignore any pen-up events with less than the requisite * count done. * * In several thousand conversions, no pen-ups where detected * before count completed. */}/** * s3c24xx_ts_select - ADC selection callback. * @client: The client that was registered with the ADC core. * @select: The reason for select. * * Called when the ADC core selects (or deslects) us as a client. */static void s3c24xx_ts_select(struct s3c_adc_client *client, unsigned select){ if (select) { writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, ts.io + S3C2410_ADCTSC); } else { mod_timer(&touch_timer, jiffies+1); writel(WAIT4INT | INT_UP, ts.io + S3C2410_ADCTSC); }}/** * s3c2410ts_probe - device core probe entry point * @pdev: The device we are being bound to. * * Initialise, find and allocate any resources we need to run and then * register with the ADC and input systems. */static int __devinit s3c2410ts_probe(struct platform_device *pdev){ struct s3c2410_ts_mach_info *info; struct device *dev = &pdev->dev; struct input_dev *input_dev; struct resource *res; int ret = -EINVAL; /* Initialise input stuff */ memset(&ts, 0, sizeof(struct s3c2410ts)); ts.dev = dev; info = pdev->dev.platform_data; if (!info) { dev_err(dev, "no platform data, cannot attach\n"); return -EINVAL; } dev_dbg(dev, "initialising touchscreen\n"); ts.clock = clk_get(dev, "adc"); if (IS_ERR(ts.clock)) { dev_err(dev, "cannot get adc clock source\n"); return -ENOENT; } clk_enable(ts.clock); dev_dbg(dev, "got and enabled clocks\n"); ts.irq_tc = ret = platform_get_irq(pdev, 0); if (ret < 0) { dev_err(dev, "no resource for interrupt\n"); goto err_clk; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(dev, "no resource for registers\n"); ret = -ENOENT; goto err_clk; } ts.io = ioremap(res->start, resource_size(res)); if (ts.io == NULL) { dev_err(dev, "cannot map registers\n"); ret = -ENOMEM; goto err_clk; } /* inititalise the gpio */ if (info->cfg_gpio) info->cfg_gpio(to_platform_device(ts.dev)); ts.client = s3c_adc_register(pdev, s3c24xx_ts_select, s3c24xx_ts_conversion, 1); if (IS_ERR(ts.client)) { dev_err(dev, "failed to register adc client\n"); ret = PTR_ERR(ts.client); goto err_iomap; } /* Initialise registers */ if ((info->delay & 0xffff) > 0) writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY); writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC); input_dev = input_allocate_device(); if (!input_dev) { dev_err(dev, "Unable to allocate the input device !!\n"); ret = -ENOMEM; goto err_iomap; } ts.input = input_dev; ts.input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); input_set_abs_params(ts.input, ABS_X, 0, 0x3FF, 0, 0); input_set_abs_params(ts.input, ABS_Y, 0, 0x3FF, 0, 0); input_set_abs_params(ts.input, ABS_PRESSURE, 0, 1, 0, 0); ts.input->name = "S3C24XX TouchScreen"; ts.input->id.bustype = BUS_HOST; ts.input->id.vendor = 0xDEAD; ts.input->id.product = 0xBEEF; ts.input->id.version = 0x0102; ts.shift = info->oversampling_shift; ts.features = platform_get_device_id(pdev)->driver_data; ret = request_irq(ts.irq_tc, stylus_irq, IRQF_DISABLED, "s3c2410_ts_pen", ts.input); if (ret) { dev_err(dev, "cannot get TC interrupt\n"); goto err_inputdev; } dev_info(dev, "driver attached, registering input device\n"); /* All went ok, so register to the input system */ ret = input_register_device(ts.input); if (ret < 0) { dev_err(dev, "failed to register input device\n"); ret = -EIO; goto err_tcirq; } return 0; err_tcirq: free_irq(ts.irq_tc, ts.input); err_inputdev: input_free_device(ts.input); err_iomap: iounmap(ts.io); err_clk: del_timer_sync(&touch_timer); clk_put(ts.clock); return ret;}/** * s3c2410ts_remove - device core removal entry point * @pdev: The device we are being removed from. * * Free up our state ready to be removed. */static int __devexit s3c2410ts_remove(struct platform_device *pdev){ free_irq(ts.irq_tc, ts.input); del_timer_sync(&touch_timer); clk_disable(ts.clock); clk_put(ts.clock); input_unregister_device(ts.input); iounmap(ts.io); return 0;}#ifdef CONFIG_PMstatic int s3c2410ts_suspend(struct device *dev){ writel(TSC_SLEEP, ts.io + S3C2410_ADCTSC); disable_irq(ts.irq_tc); clk_disable(ts.clock); return 0;}static int s3c2410ts_resume(struct device *dev){ struct platform_device *pdev = to_platform_device(dev); struct s3c2410_ts_mach_info *info = pdev->dev.platform_data; clk_enable(ts.clock); enable_irq(ts.irq_tc); /* Initialise registers */ if ((info->delay & 0xffff) > 0) writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY); writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC); return 0;}static struct dev_pm_ops s3c_ts_pmops = { .suspend = s3c2410ts_suspend, .resume = s3c2410ts_resume,};#endifstatic struct platform_device_id s3cts_driver_ids[] = { { "s3c2410-ts", 0 }, { "s3c2440-ts", 0 }, { "s3c64xx-ts", FEAT_PEN_IRQ }, { }};MODULE_DEVICE_TABLE(platform, s3cts_driver_ids);static struct platform_driver s3c_ts_driver = { .driver = { .name = "samsung-ts", .owner = THIS_MODULE,#ifdef CONFIG_PM .pm = &s3c_ts_pmops,#endif }, .id_table = s3cts_driver_ids, .probe = s3c2410ts_probe, .remove = __devexit_p(s3c2410ts_remove),};static int __init s3c2410ts_init(void){ return platform_driver_register(&s3c_ts_driver);}static void __exit s3c2410ts_exit(void){ platform_driver_unregister(&s3c_ts_driver);}module_init(s3c2410ts_init);module_exit(s3c2410ts_exit);MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, " "Ben Dooks <ben@simtec.co.uk>, " "Simtec Electronics <linux@simtec.co.uk>");MODULE_DESCRIPTION("S3C24XX Touchscreen driver");MODULE_LICENSE("GPL v2"); 2，在arch/arm/plat-s3c/include/plat下添加ts.h内容如下/* arch/arm/plat-s3c/include/plat/ts.h * * Copyright (c) 2005 Arnaud Patard <arnaud.patard@rtp-net.org> * * 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.*/#ifndef __ASM_ARM_TS_H#define __ASM_ARM_TS_Hstruct s3c2410_ts_mach_info { int delay; int presc; int oversampling_shift; void (*cfg_gpio)(struct platform_device *dev);};extern void s3c24xx_ts_set_platdata(struct s3c2410_ts_mach_info *);/* defined by architecture to configure gpio */extern void s3c24xx_ts_cfg_gpio(struct platform_device *dev);#endif /* __ASM_ARM_TS_H */ 3，在目标板文件arch/arm/mach-s3c2440/mach-fz2440.c添加#include <plat/ts.h>/* Touch Pannel */static struct s3c2410_ts_mach_info __initdata fz2440_ts_cfg = { .delay = 10000, .presc = 49, .oversampling_shift = 2,};static struct platform_device __initdata *fz2440_devices[] = {&s3c_device_usb,&s3c_device_lcd,&s3c_device_wdt,&s3c_device_i2c0,&s3c_device_iis, &s3c_device_nand,&s3c_device_rtc,&s3c_device_uda1341,&s3c_device_adc,&s3c_device_hwmon,&s3c_device_ts,};static void __init fz2440_machine_init(void){s3c24xx_fb_set_platdata(&fz2440_fb_info);s3c_i2c0_set_platdata(NULL);s3c_hwmon_set_platdata(&fz2440_hwmon_info);s3c24xx_ts_set_platdata(&fz2440_ts_cfg); s3c_device_nand.dev.platform_data = &fz2440_nand_info;platform_add_devices(fz2440_devices, ARRAY_SIZE(fz2440_devices));//smdk_machine_init();}4，在arch/plat-s3c24xx/devs.c中添加/* Touch Screen Device */static struct resource s3c_ts_resource[] = { [0] = { .start = S3C24XX_PA_ADC, .end = S3C24XX_PA_ADC + S3C24XX_SZ_ADC - 1, .flags = IORESOURCE_MEM, }, [1] = { .start = IRQ_TC, .end = IRQ_TC, .flags = IORESOURCE_IRQ, },};struct platform_device s3c_device_ts = { .name = "s3c2410-ts", .id = -1, .num_resources = ARRAY_SIZE(s3c_ts_resource), .resource = s3c_ts_resource,};EXPORT_SYMBOL(s3c_device_ts);void __init s3c24xx_ts_set_platdata(struct s3c2410_ts_mach_info *pd){ struct s3c2410_ts_mach_info *npd; if (!pd) { printk(KERN_ERR "%s: no platform data\n", __func__); return; } npd = kmemdup(pd, sizeof(struct s3c2410_ts_mach_info), GFP_KERNEL); if (!npd) printk(KERN_ERR "%s: no memory for platform data\n", __func__); s3c_device_ts.dev.platform_data = npd;}5，在driver/input/touchscreen/makefile中添加obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o在driver/input/touchscreen/kconfig中增加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 messages6，配置内核 Device Drivers ---> Input device support ---><*> Event interface[*] Touchscreens --->--- Touchscreens--- Touchscreens<*> Samsung S3C2410 touchscreen input driver 7，启动时输出input: S3C24XX TouchScreen as /devices/virtual/input/input0crw-rw---- 1 root root 13, 64 Jan 1 00:00 /dev/event0samsung-ts s3c2410-ts: driver attached, registering input device进入终端查看设备root@FZ:/# ls -l /dev/event0调用tslib测试程序成功，又12点多了，睡觉~~。
