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linux 下input/mouse 节点

2013年10月29日 ⁄ 综合 ⁄ 共 3970字 ⁄ 字号 评论关闭

linux 下/dev/input/mouse* 节我知道一直是由mouse_handl也就是原代码/driver/input/mousedev.c生成的,但有时候有,有时候没有,今天细细研究了一下终于明了其中原由下面的驱动源代码是amimouse.c更改的

#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>

#include <asm/irq.h>
#include <asm/setup.h>
#include <asm/uaccess.h>

MODULE_AUTHOR("WEED<weed_hz@126.com>");
MODULE_LICENSE("GPL");

static struct platform_device *p_dev;

static int amimouse_open(struct input_dev *dev)
{
	return 0;
}

static void amimouse_close(struct input_dev *dev)
{
	return;
}

static int __init amimouse_probe(struct platform_device *pdev)
{
	int err;
	struct input_dev *dev;

	dev = input_allocate_device();
	if (!dev)
		return -ENOMEM;

	dev->name = pdev->name;
	dev->phys = "amimouse/input0";
	dev->id.bustype = BUS_AMIGA;
	dev->id.vendor = 0x0001;
	dev->id.product = 0x0002;
	dev->id.version = 0x0100;

	dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
	dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
	dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
	dev->open = amimouse_open;
	dev->close = amimouse_close;
	dev->dev.parent = &pdev->dev;

	err = input_register_device(dev);
	if (err) {
		input_free_device(dev);
		return err;
	}

	platform_set_drvdata(pdev, dev);

	return 0;
}

static int __exit amimouse_remove(struct platform_device *pdev)
{
	struct input_dev *dev = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);
	input_unregister_device(dev);
	return 0;
}

static struct platform_driver amimouse_driver = {
	.remove = __exit_p(amimouse_remove),
	.driver   = {
		.name	= "amiga-mouse",
		.owner	= THIS_MODULE,
	},
};

static int __init amimouse_init(void)
{
	p_dev= platform_device_register_simple("amiga-mouse",-1,NULL,0);	
	return platform_driver_probe(&amimouse_driver, amimouse_probe);
}

module_init(amimouse_init);

static void __exit amimouse_exit(void)
{
	platform_driver_unregister(&amimouse_driver);
}

module_exit(amimouse_exit);

最主要是id要对上就是mousedev.c里面的

static const struct input_device_id mousedev_ids[] = {
    {
        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                INPUT_DEVICE_ID_MATCH_KEYBIT |
                INPUT_DEVICE_ID_MATCH_RELBIT,
        .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
        .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
        .relbit = { BIT_MASK(REL_X) | BIT_MASK(REL_Y) },
    },  /* A mouse like device, at least one button,
           two relative axes */
    {    
        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                INPUT_DEVICE_ID_MATCH_RELBIT,
        .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) },
        .relbit = { BIT_MASK(REL_WHEEL) },
    },  /* A separate scrollwheel */
    {    
        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                INPUT_DEVICE_ID_MATCH_KEYBIT |
                INPUT_DEVICE_ID_MATCH_ABSBIT,
        .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
        .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
        .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
    },  /* A tablet like device, at least touch detection,
           two absolute axes */
    {    
        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
                INPUT_DEVICE_ID_MATCH_KEYBIT |
                INPUT_DEVICE_ID_MATCH_ABSBIT,
        .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
        .keybit = { [BIT_WORD(BTN_TOOL_FINGER)] =
                BIT_MASK(BTN_TOOL_FINGER) },
        .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
                BIT_MASK(ABS_PRESSURE) |
                BIT_MASK(ABS_TOOL_WIDTH) },
    },  /* A touchpad */
    {    
        .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
            INPUT_DEVICE_ID_MATCH_KEYBIT |
            INPUT_DEVICE_ID_MATCH_ABSBIT,
        .evbit = { BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS) },
        .keybit = { [BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) },
        .absbit = { BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) },
    },  /* Mouse-like device with absolute X and Y but ordinary
           clicks, like hp ILO2 High Performance mouse */

    { },    /* Terminating entry */
};

进行匹配的源代码

static const struct input_device_id *input_match_device(const struct input_device_id *id,  
                            struct input_dev *dev)  
{  
    int i;  
  
    for (; id->flags || id->driver_info; id++) {  
  
        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;  
    }  
  
    return NULL;  
}  

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