hid/usbhid/hiddev.c

23 #include <linux/hiddev.h>
44 	struct hiddev *hiddev;
143 	struct hiddev *hiddev = hid->hiddev;
147 	spin_lock_irqsave(&hiddev->list_lock, flags);
148 	list_for_each_entry(list, &hiddev->list, node) {
157 	spin_unlock_irqrestore(&hiddev->list_lock, flags);
159 	wake_up_interruptible(&hiddev->wait);
163  * This is where hid.c calls into hiddev to pass an event that occurred over
221 	spin_lock_irqsave(&list->hiddev->list_lock, flags);
223 	spin_unlock_irqrestore(&list->hiddev->list_lock, flags);
225 	mutex_lock(&list->hiddev->existancelock);
226 	if (!--list->hiddev->open) {
227 		if (list->hiddev->exist) {
228 			hid_hw_close(list->hiddev->hid);
229 			hid_hw_power(list->hiddev->hid, PM_HINT_NORMAL);
231 			mutex_unlock(&list->hiddev->existancelock);
232 			kfree(list->hiddev);
238 	mutex_unlock(&list->hiddev->existancelock);
244 static int __hiddev_open(struct hiddev *hiddev, struct file *file)
249 	lockdep_assert_held(&hiddev->existancelock);
256 	list->hiddev = hiddev;
258 	if (!hiddev->open++) {
259 		error = hid_hw_power(hiddev->hid, PM_HINT_FULLON);
263 		error = hid_hw_open(hiddev->hid);
268 	spin_lock_irq(&hiddev->list_lock);
269 	list_add_tail(&list->node, &hiddev->list);
270 	spin_unlock_irq(&hiddev->list_lock);
277 	hid_hw_power(hiddev->hid, PM_HINT_NORMAL);
279 	hiddev->open--;
291 	struct hiddev *hiddev;
299 	hiddev = hid->hiddev;
301 	mutex_lock(&hiddev->existancelock);
302 	res = hiddev->exist ? __hiddev_open(hiddev, file) : -ENODEV;
303 	mutex_unlock(&hiddev->existancelock);
339 			prepare_to_wait(&list->hiddev->wait, &wait, TASK_INTERRUPTIBLE);
346 				if (!list->hiddev->exist) {
359 					finish_wait(&list->hiddev->wait, &wait);
364 			finish_wait(&list->hiddev->wait, &wait);
416 	poll_wait(file, &list->hiddev->wait, wait);
419 	if (!list->hiddev->exist)
427 static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
429 	struct hid_device *hid = hiddev->hid;
566 static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, void __user *user_arg)
568 	struct hid_device *hid = hiddev->hid;
597 	struct hiddev *hiddev = list->hiddev;
610 	mutex_lock(&hiddev->existancelock);
611 	if (!hiddev->exist) {
616 	hid = hiddev->hid;
685 		r = hiddev_ioctl_string(hiddev, cmd, user_arg);
690 		hiddev->initialized = true;
793 		if (!hiddev->initialized) {
795 			hiddev->initialized = true;
797 		r = hiddev_ioctl_usage(hiddev, cmd, user_arg);
843 	mutex_unlock(&hiddev->existancelock);
866 	.name =		"hiddev%d",
873  * This is where hid.c calls us to connect a hid device to the hiddev driver
877 	struct hiddev *hiddev;
893 	if (!(hiddev = kzalloc(sizeof(struct hiddev), GFP_KERNEL)))
896 	init_waitqueue_head(&hiddev->wait);
897 	INIT_LIST_HEAD(&hiddev->list);
898 	spin_lock_init(&hiddev->list_lock);
899 	mutex_init(&hiddev->existancelock);
900 	hid->hiddev = hiddev;
901 	hiddev->hid = hid;
902 	hiddev->exist = 1;
906 		hid->hiddev = NULL;
907 		kfree(hiddev);
915 	hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS;
917 	hiddev->minor = usbhid->intf->minor;
923  * This is where hid.c calls us to disconnect a hiddev device from the
929 	struct hiddev *hiddev = hid->hiddev;
934 	mutex_lock(&hiddev->existancelock);
935 	hiddev->exist = 0;
937 	if (hiddev->open) {
938 		hid_hw_close(hiddev->hid);
939 		wake_up_interruptible(&hiddev->wait);
940 		mutex_unlock(&hiddev->existancelock);
942 		mutex_unlock(&hiddev->existancelock);
943 		kfree(hiddev);