28 struct evdev {  struct
46 	struct evdev *evdev;  argument
52 static struct evdev *evdev_table[EVDEV_MINORS];
89 	struct evdev *evdev = handle->private;  in evdev_event()  local
100 	client = rcu_dereference(evdev->grab);  in evdev_event()
104 		list_for_each_entry_rcu(client, &evdev->client_list, node)  in evdev_event()
109 	wake_up_interruptible(&evdev->wait);  in evdev_event()
122 	struct evdev *evdev = client->evdev;  in evdev_flush()  local
125 	retval = mutex_lock_interruptible(&evdev->mutex);  in evdev_flush()
129 	if (!evdev->exist)  in evdev_flush()
132 		retval = input_flush_device(&evdev->handle, file);  in evdev_flush()
134 	mutex_unlock(&evdev->mutex);  in evdev_flush()
140 	struct evdev *evdev = container_of(dev, struct evdev, dev);  in evdev_free()  local
142 	input_put_device(evdev->handle.dev);  in evdev_free()
143 	kfree(evdev);  in evdev_free()
150 static int evdev_grab(struct evdev *evdev, struct evdev_client *client)  in evdev_grab()  argument
154 	if (evdev->grab)  in evdev_grab()
157 	error = input_grab_device(&evdev->handle);  in evdev_grab()
161 	rcu_assign_pointer(evdev->grab, client);  in evdev_grab()
167 static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)  in evdev_ungrab()  argument
169 	if (evdev->grab != client)  in evdev_ungrab()
172 	rcu_assign_pointer(evdev->grab, NULL);  in evdev_ungrab()
174 	input_release_device(&evdev->handle);  in evdev_ungrab()
179 static void evdev_attach_client(struct evdev *evdev,  in evdev_attach_client()  argument
182 	spin_lock(&evdev->client_lock);  in evdev_attach_client()
183 	list_add_tail_rcu(&client->node, &evdev->client_list);  in evdev_attach_client()
184 	spin_unlock(&evdev->client_lock);  in evdev_attach_client()
188 static void evdev_detach_client(struct evdev *evdev,  in evdev_detach_client()  argument
191 	spin_lock(&evdev->client_lock);  in evdev_detach_client()
193 	spin_unlock(&evdev->client_lock);  in evdev_detach_client()
197 static int evdev_open_device(struct evdev *evdev)  in evdev_open_device()  argument
201 	retval = mutex_lock_interruptible(&evdev->mutex);  in evdev_open_device()
205 	if (!evdev->exist)  in evdev_open_device()
207 	else if (!evdev->open++) {  in evdev_open_device()
208 		retval = input_open_device(&evdev->handle);  in evdev_open_device()
210 			evdev->open--;  in evdev_open_device()
213 	mutex_unlock(&evdev->mutex);  in evdev_open_device()
217 static void evdev_close_device(struct evdev *evdev)  in evdev_close_device()  argument
219 	mutex_lock(&evdev->mutex);  in evdev_close_device()
221 	if (evdev->exist && !--evdev->open)  in evdev_close_device()
222 		input_close_device(&evdev->handle);  in evdev_close_device()
224 	mutex_unlock(&evdev->mutex);  in evdev_close_device()
231 static void evdev_hangup(struct evdev *evdev)  in evdev_hangup()  argument
235 	spin_lock(&evdev->client_lock);  in evdev_hangup()
236 	list_for_each_entry(client, &evdev->client_list, node)  in evdev_hangup()
238 	spin_unlock(&evdev->client_lock);  in evdev_hangup()
240 	wake_up_interruptible(&evdev->wait);  in evdev_hangup()
246 	struct evdev *evdev = client->evdev;  in evdev_release()  local
248 	mutex_lock(&evdev->mutex);  in evdev_release()
249 	if (evdev->grab == client)  in evdev_release()
250 		evdev_ungrab(evdev, client);  in evdev_release()
251 	mutex_unlock(&evdev->mutex);  in evdev_release()
253 	evdev_detach_client(evdev, client);  in evdev_release()
256 	evdev_close_device(evdev);  in evdev_release()
257 	put_device(&evdev->dev);  in evdev_release()
273 	struct evdev *evdev;  in evdev_open()  local
285 	evdev = evdev_table[i];  in evdev_open()
286 	if (evdev)  in evdev_open()
287 		get_device(&evdev->dev);  in evdev_open()
290 	if (!evdev)  in evdev_open()
293 	bufsize = evdev_compute_buffer_size(evdev->handle.dev);  in evdev_open()
305 	client->evdev = evdev;  in evdev_open()
306 	evdev_attach_client(evdev, client);  in evdev_open()
308 	error = evdev_open_device(evdev);  in evdev_open()
318 	evdev_detach_client(evdev, client);  in evdev_open()
321 	put_device(&evdev->dev);  in evdev_open()
329 	struct evdev *evdev = client->evdev;  in evdev_write()  local
336 	retval = mutex_lock_interruptible(&evdev->mutex);  in evdev_write()
340 	if (!evdev->exist) {  in evdev_write()
352 		input_inject_event(&evdev->handle,  in evdev_write()
357 	mutex_unlock(&evdev->mutex);  in evdev_write()
383 	struct evdev *evdev = client->evdev;  in evdev_read()  local
390 	if (client->head == client->tail && evdev->exist &&  in evdev_read()
394 	retval = wait_event_interruptible(evdev->wait,  in evdev_read()
395 		client->head != client->tail || !evdev->exist);  in evdev_read()
399 	if (!evdev->exist)  in evdev_read()
418 	struct evdev *evdev = client->evdev;  in evdev_poll()  local
421 	poll_wait(file, &evdev->wait, wait);  in evdev_poll()
423 	mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;  in evdev_poll()
624 	struct evdev *evdev = client->evdev;  in evdev_do_ioctl()  local
625 	struct input_dev *dev = evdev->handle.dev;  in evdev_do_ioctl()
661 		input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);  in evdev_do_ioctl()
662 		input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);  in evdev_do_ioctl()
678 			return evdev_grab(evdev, client);  in evdev_do_ioctl()
680 			return evdev_ungrab(evdev, client);  in evdev_do_ioctl()
805 	struct evdev *evdev = client->evdev;  in evdev_ioctl_handler()  local
808 	retval = mutex_lock_interruptible(&evdev->mutex);  in evdev_ioctl_handler()
812 	if (!evdev->exist) {  in evdev_ioctl_handler()
820 	mutex_unlock(&evdev->mutex);  in evdev_ioctl_handler()
853 static int evdev_install_chrdev(struct evdev *evdev)  in evdev_install_chrdev()  argument
859 	evdev_table[evdev->minor] = evdev;  in evdev_install_chrdev()
863 static void evdev_remove_chrdev(struct evdev *evdev)  in evdev_remove_chrdev()  argument
869 	evdev_table[evdev->minor] = NULL;  in evdev_remove_chrdev()
878 static void evdev_mark_dead(struct evdev *evdev)  in evdev_mark_dead()  argument
880 	mutex_lock(&evdev->mutex);  in evdev_mark_dead()
881 	evdev->exist = false;  in evdev_mark_dead()
882 	mutex_unlock(&evdev->mutex);  in evdev_mark_dead()
885 static void evdev_cleanup(struct evdev *evdev)  in evdev_cleanup()  argument
887 	struct input_handle *handle = &evdev->handle;  in evdev_cleanup()
889 	evdev_mark_dead(evdev);  in evdev_cleanup()
890 	evdev_hangup(evdev);  in evdev_cleanup()
891 	evdev_remove_chrdev(evdev);  in evdev_cleanup()
894 	if (evdev->open) {  in evdev_cleanup()
907 	struct evdev *evdev;  in evdev_connect()  local
920 	evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);  in evdev_connect()
921 	if (!evdev)  in evdev_connect()
924 	INIT_LIST_HEAD(&evdev->client_list);  in evdev_connect()
925 	spin_lock_init(&evdev->client_lock);  in evdev_connect()
926 	mutex_init(&evdev->mutex);  in evdev_connect()
927 	init_waitqueue_head(&evdev->wait);  in evdev_connect()
929 	dev_set_name(&evdev->dev, "event%d", minor);  in evdev_connect()
930 	evdev->exist = true;  in evdev_connect()
931 	evdev->minor = minor;  in evdev_connect()
933 	evdev->handle.dev = input_get_device(dev);  in evdev_connect()
934 	evdev->handle.name = dev_name(&evdev->dev);  in evdev_connect()
935 	evdev->handle.handler = handler;  in evdev_connect()
936 	evdev->handle.private = evdev;  in evdev_connect()
938 	evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);  in evdev_connect()
939 	evdev->dev.class = &input_class;  in evdev_connect()
940 	evdev->dev.parent = &dev->dev;  in evdev_connect()
941 	evdev->dev.release = evdev_free;  in evdev_connect()
942 	device_initialize(&evdev->dev);  in evdev_connect()
944 	error = input_register_handle(&evdev->handle);  in evdev_connect()
948 	error = evdev_install_chrdev(evdev);  in evdev_connect()
952 	error = device_add(&evdev->dev);  in evdev_connect()
959 	evdev_cleanup(evdev);  in evdev_connect()
961 	input_unregister_handle(&evdev->handle);  in evdev_connect()
963 	put_device(&evdev->dev);  in evdev_connect()
969 	struct evdev *evdev = handle->private;  in evdev_disconnect()  local
971 	device_del(&evdev->dev);  in evdev_disconnect()
972 	evdev_cleanup(evdev);  in evdev_disconnect()
974 	put_device(&evdev->dev);  in evdev_disconnect()