42 	struct uleds_device *udev = container_of(led_cdev, struct uleds_device,  in uleds_brightness_set()  local
45 	if (udev->brightness != brightness) {  in uleds_brightness_set()
46 		udev->brightness = brightness;  in uleds_brightness_set()
47 		udev->new_data = true;  in uleds_brightness_set()
48 		wake_up_interruptible(&udev->waitq);  in uleds_brightness_set()
54 	struct uleds_device *udev;  in uleds_open()  local
56 	udev = kzalloc(sizeof(*udev), GFP_KERNEL);  in uleds_open()
57 	if (!udev)  in uleds_open()
60 	udev->led_cdev.name = udev->user_dev.name;  in uleds_open()
61 	udev->led_cdev.brightness_set = uleds_brightness_set;  in uleds_open()
63 	mutex_init(&udev->mutex);  in uleds_open()
64 	init_waitqueue_head(&udev->waitq);  in uleds_open()
65 	udev->state = ULEDS_STATE_UNKNOWN;  in uleds_open()
67 	file->private_data = udev;  in uleds_open()
76 	struct uleds_device *udev = file->private_data;  in uleds_write()  local
83 	ret = mutex_lock_interruptible(&udev->mutex);  in uleds_write()
87 	if (udev->state == ULEDS_STATE_REGISTERED) {  in uleds_write()
97 	if (copy_from_user(&udev->user_dev, buffer,  in uleds_write()
103 	name = udev->user_dev.name;  in uleds_write()
110 	if (udev->user_dev.max_brightness <= 0) {  in uleds_write()
114 	udev->led_cdev.max_brightness = udev->user_dev.max_brightness;  in uleds_write()
117 					 &udev->led_cdev);  in uleds_write()
121 	udev->new_data = true;  in uleds_write()
122 	udev->state = ULEDS_STATE_REGISTERED;  in uleds_write()
126 	mutex_unlock(&udev->mutex);  in uleds_write()
134 	struct uleds_device *udev = file->private_data;  in uleds_read()  local
137 	if (count < sizeof(udev->brightness))  in uleds_read()
141 		retval = mutex_lock_interruptible(&udev->mutex);  in uleds_read()
145 		if (udev->state != ULEDS_STATE_REGISTERED) {  in uleds_read()
147 		} else if (!udev->new_data && (file->f_flags & O_NONBLOCK)) {  in uleds_read()
149 		} else if (udev->new_data) {  in uleds_read()
150 			retval = copy_to_user(buffer, &udev->brightness,  in uleds_read()
151 					      sizeof(udev->brightness));  in uleds_read()
152 			udev->new_data = false;  in uleds_read()
153 			retval = sizeof(udev->brightness);  in uleds_read()
156 		mutex_unlock(&udev->mutex);  in uleds_read()
162 			retval = wait_event_interruptible(udev->waitq,  in uleds_read()
163 					udev->new_data ||  in uleds_read()
164 					udev->state != ULEDS_STATE_REGISTERED);  in uleds_read()
172 	struct uleds_device *udev = file->private_data;  in uleds_poll()  local
174 	poll_wait(file, &udev->waitq, wait);  in uleds_poll()
176 	if (udev->new_data)  in uleds_poll()
184 	struct uleds_device *udev = file->private_data;  in uleds_release()  local
186 	if (udev->state == ULEDS_STATE_REGISTERED) {  in uleds_release()
187 		udev->state = ULEDS_STATE_UNKNOWN;  in uleds_release()
189 					     &udev->led_cdev);  in uleds_release()
191 	kfree(udev);  in uleds_release()