浅析/dev/input/下major主设备号13鼠标键盘字符设备根据minor匹配上的内核驱动

浅析/dev/input/下major主设备号13鼠标键盘字符设备根据minor匹配上的内核驱动

drivers/input/input.c|1643| err = register_chrdev(INPUT_MAJOR, "input", &input_fops); // 对应/dev/input/下所有major号为13的设备

static const struct file_operations input_fops = {
    .owner = THIS_MODULE,
    .open = input_open_file,                                                          // 只有1个open函数,他将根据minor查找input_table[]驱动
};

对于mouse设备
drivers/input/mousedev.c|1072| error = input_register_handler(&mousedev_handler);
mousedev_init
==> input_register_handler(&mousedev_handler);                                        // 32个minor为一组,由一个handler驱动[luther.gliethttp].
#define MOUSEDEV_MINOR_BASE    32
static struct input_handler mousedev_handler = {
    .event =    mousedev_event,
    .connect =    mousedev_connect,
    .disconnect =    mousedev_disconnect,
    .fops =        &mousedev_fops,
    .minor =    MOUSEDEV_MINOR_BASE,                                                 // minor等于32-64的/dev/input/节点由mousedev_fops方法管理
    .name =        "mousedev",
    .id_table =    mousedev_ids,
};

static const struct file_operations mousedev_fops = {
    .owner =    THIS_MODULE,
    .read =        mousedev_read,
    .write =    mousedev_write,
    .poll =        mousedev_poll,
    .open =        mousedev_open,
    .release =    mousedev_release,
    .fasync =    mousedev_fasync,
};

对于键盘设备
drivers/input/evdev.c|995| return input_register_handler(&evdev_handler);
evdev_init
==> input_register_handler(&evdev_handler);
#define EVDEV_MINOR_BASE    64                                                       // 32个minor为一组,由一个handler驱动[luther.gliethttp].
static struct input_handler evdev_handler = {
    .event        = evdev_event,
    .connect    = evdev_connect,
    .disconnect    = evdev_disconnect,
    .fops        = &evdev_fops,
    .minor        = EVDEV_MINOR_BASE,                                                  // minor等于64-96的/dev/input/节点由evdev_fops方法管理
    .name        = "evdev",
    .id_table    = evdev_ids,
};

static const struct file_operations evdev_fops = {
    .owner        = THIS_MODULE,
    .read        = evdev_read,
    .write        = evdev_write,
    .poll        = evdev_poll,
    .open        = evdev_open,
    .release    = evdev_release,
    .unlocked_ioctl    = evdev_ioctl,
#ifdef CONFIG_COMPAT
    .compat_ioctl    = evdev_ioctl_compat,
#endif
    .fasync        = evdev_fasync,
    .flush        = evdev_flush
};