fl2440触摸屏驱动阅读记录

看得两个眼睛冒星星，不过还是把流程大概缕了下。看来内核很喜欢搞成那种总线、设备、驱动这样的结构，输入子系统也很像。把阅读的关键代码记录一下，有关输入子系统的详细内容还需要查阅相关的资料。

#####################################################################arch/arm/plat-s3c24xx/devs.cstruct platform_device s3c_device_ts = {.name  = "s3c2410-ts",.id   = -1,};############################################################################################################################################arch/arm/mach-s3c2410/mach-smdk2410.cstatic struct platform_device *smdk2410_devices[] __initdata = {&s3c_device_usb,&s3c_device_lcd,&s3c_device_wdt,&s3c_device_i2c,&s3c_device_iis,&s3c_device_sdi,&s3c_device_dm9000,&te2410_cs89x0,&s3c_device_ts,};static void __init smdk2410_init(void){s3c24xx_fb_set_platdata(&smdk2410_fb_info); set_s3c2410ts_info(&smdk2410_ts_cfg);platform_add_devices(smdk2410_devices, ARRAY_SIZE(smdk2410_devices));smdk_machine_init();}##################################################################################################################################################drivers/input/touchscreen/s3c2410_ts.cstatic 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_probe(struct platform_device *pdev){info = ( struct s3c2410_ts_mach_info *)pdev->dev.platform_data;input_dev = input_allocate_device();rc = input_register_device(ts.dev);|init_timer(&dev->timer);error = device_add(&dev->dev);list_add_tail(&dev->node, &input_dev_list);list_for_each_entry(handler, &input_handler_list, node)input_attach_handler(dev, handler);//这里让dev和handler进行匹配，最后跟tsdev.c中注册的handler匹配。}#########################################################################输入子系统：######################################################################################drivers/input/input.cstatic int __init input_init(void){err = class_register(&input_class);err = input_proc_init();err = register_chrdev(INPUT_MAJOR, "input", &input_fops);}static const struct file_operations input_fops = {.owner = THIS_MODULE,.open = input_open_file,};static int input_open_file(struct inode *inode, struct file *file){}int input_register_device(struct input_dev *dev){list_add_tail(&dev->node, &input_dev_list);list_for_each_entry(handler, &input_handler_list, node)input_attach_handler(dev, handler);}//搜索input_handler_list,发现在下面这个函数中int input_register_handler(struct input_handler *handler){list_add_tail(&handler->node, &input_handler_list);}static int input_attach_handler(struct input_dev *dev, struct input_handler *handler){id = input_match_device(handler->id_table, dev);|for (; id->flags || id->driver_info; id++) {//比较id里面每一个字段的值，如果与dev有一项不符就跳出，直到所有dev设置的字段在id里面都匹配为止。if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)if (id->bustype != dev->id.bustype)continue;if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)if (id->vendor != dev->id.vendor)continue;if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)if (id->product != dev->id.product)continue;if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)if (id->version != dev->id.version)continue;MATCH_BIT(evbit,  EV_MAX);MATCH_BIT(keybit, KEY_MAX);MATCH_BIT(relbit, REL_MAX);MATCH_BIT(absbit, ABS_MAX);MATCH_BIT(mscbit, MSC_MAX);MATCH_BIT(ledbit, LED_MAX);MATCH_BIT(sndbit, SND_MAX);MATCH_BIT(ffbit,  FF_MAX);MATCH_BIT(swbit,  SW_MAX);return id;}error = handler->connect(handler, dev, id);}void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value){input_handle_event(dev, type, code, value);|dev->event(dev, type, code, value);input_pass_event(dev, type, code, value);|list_for_each_entry_rcu(handle, &dev->h_list, d_node)if (handle->open)handle->handler->event(handle, type, code, value);//这个envent是在tsdev_connect这个函数里面添加到相关联的dev的h_list中的。最后会调用到tsdev_event}########################################################################################drivers/input/tsdev.c//这里将tsdev_handler注册到上面的input_handler_list链表中。static struct input_handler tsdev_handler = {.event= tsdev_event,.connect= tsdev_connect,.disconnect= tsdev_disconnect,.fops= &tsdev_fops,.minor= TSDEV_MINOR_BASE,.name= "tsdev",.id_table= tsdev_ids,};static const struct input_device_id tsdev_ids[] = {{      .flags= INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_RELBIT,      .evbit= { BIT(EV_KEY) | BIT(EV_REL) },      .keybit= { [BTN_LEFT/32] = BIT(BTN_LEFT) },      .relbit= { BIT(REL_X) | BIT(REL_Y) },}, /* A mouse like device, at least one button, two relative axes */{      .flags= INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,      .evbit= { BIT(EV_KEY) | BIT(EV_ABS) },      .keybit= { [BTN_TOUCH/32] = BIT(BTN_TOUCH) },      .absbit= { BIT(ABS_X) | BIT(ABS_Y) },}, /* A tablet like device, at least touch detection, two absolute axes */{      .flags= INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,      .evbit= { BIT(EV_ABS) },      .absbit= { BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE) },}, /* A tablet like device with several gradations of pressure */{} /* Terminating entry */};static int __init tsdev_init(void){return input_register_handler(&tsdev_handler);}static int tsdev_connect(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id){tsdev = kzalloc(sizeof(struct tsdev), GFP_KERNEL);if (!tsdev)return -ENOMEM;INIT_LIST_HEAD(&tsdev->client_list);spin_lock_init(&tsdev->client_lock);mutex_init(&tsdev->mutex);init_waitqueue_head(&tsdev->wait);snprintf(tsdev->name, sizeof(tsdev->name), "ts%d", minor);tsdev->exist = 1;tsdev->minor = minor;tsdev->handle.dev = dev;tsdev->handle.name = tsdev->name;tsdev->handle.handler = handler;//这个handler就是在tsdev_init中注册的那个tsdev_hanldertsdev->handle.private = tsdev;error = input_register_handle(&tsdev->handle);error = tsdev_install_chrdev(tsdev);error = device_add(&tsdev->dev);}