15  * Module roccat is a char device used to report special events of roccat
18  * not stored in device. The information in these events depends on hid device
48 	struct device *dev;
65 	struct roccat_device *device;  member
80 	struct roccat_device *device = reader->device;  in roccat_read()  local
85 	mutex_lock(&device->cbuf_lock);  in roccat_read()
88 	if (reader->cbuf_start == device->cbuf_end) {  in roccat_read()
89 		add_wait_queue(&device->wait, &wait);  in roccat_read()
93 		while (reader->cbuf_start == device->cbuf_end) {  in roccat_read()
102 			if (!device->exist) {  in roccat_read()
107 			mutex_unlock(&device->cbuf_lock);  in roccat_read()
109 			mutex_lock(&device->cbuf_lock);  in roccat_read()
114 		remove_wait_queue(&device->wait, &wait);  in roccat_read()
121 	report = &device->cbuf[reader->cbuf_start];  in roccat_read()
126 	len = device->report_size > count ? count : device->report_size;  in roccat_read()
136 	mutex_unlock(&device->cbuf_lock);  in roccat_read()
143 	poll_wait(file, &reader->device->wait, wait);  in roccat_poll()
144 	if (reader->cbuf_start != reader->device->cbuf_end)  in roccat_poll()
146 	if (!reader->device->exist)  in roccat_poll()
155 	struct roccat_device *device;  in roccat_open()  local
164 	device = devices[minor];  in roccat_open()
166 	if (!device) {  in roccat_open()
167 		pr_emerg("roccat device with minor %d doesn't exist\n", minor);  in roccat_open()
172 	mutex_lock(&device->readers_lock);  in roccat_open()
174 	if (!device->open++) {  in roccat_open()
175 		/* power on device on adding first reader */  in roccat_open()
176 		error = hid_hw_power(device->hid, PM_HINT_FULLON);  in roccat_open()
178 			--device->open;  in roccat_open()
182 		error = hid_hw_open(device->hid);  in roccat_open()
184 			hid_hw_power(device->hid, PM_HINT_NORMAL);  in roccat_open()
185 			--device->open;  in roccat_open()
190 	reader->device = device;  in roccat_open()
192 	reader->cbuf_start = device->cbuf_end;  in roccat_open()
194 	list_add_tail(&reader->node, &device->readers);  in roccat_open()
198 	mutex_unlock(&device->readers_lock);  in roccat_open()
210 	struct roccat_device *device;  in roccat_release()  local
214 	device = devices[minor];  in roccat_release()
215 	if (!device) {  in roccat_release()
217 		pr_emerg("roccat device with minor %d doesn't exist\n", minor);  in roccat_release()
221 	mutex_lock(&device->readers_lock);  in roccat_release()
223 	mutex_unlock(&device->readers_lock);  in roccat_release()
226 	if (!--device->open) {  in roccat_release()
228 		if (device->exist) {  in roccat_release()
229 			hid_hw_power(device->hid, PM_HINT_NORMAL);  in roccat_release()
230 			hid_hw_close(device->hid);  in roccat_release()
232 			kfree(device);  in roccat_release()
243  * @minor: minor device number returned by roccat_connect()
253 	struct roccat_device *device;  in roccat_report_event()  local
258 	device = devices[minor];  in roccat_report_event()
260 	new_value = kmemdup(data, device->report_size, GFP_ATOMIC);  in roccat_report_event()
264 	report = &device->cbuf[device->cbuf_end];  in roccat_report_event()
270 	device->cbuf_end = (device->cbuf_end + 1) % ROCCAT_CBUF_SIZE;  in roccat_report_event()
272 	list_for_each_entry(reader, &device->readers, node) {  in roccat_report_event()
279 		if (reader->cbuf_start == device->cbuf_end)  in roccat_report_event()
283 	wake_up_interruptible(&device->wait);  in roccat_report_event()
289  * roccat_connect() - create a char device for special event output
290  * @class: the class thats used to create the device. Meant to hold device
292  * @hid: the hid device the char device should be connected to.
294  * Return value is minor device number in Range [0, ROCCAT_MAX_DEVICES] on
300 	struct roccat_device *device;  in roccat_connect()  local
303 	device = kzalloc(sizeof(struct roccat_device), GFP_KERNEL);  in roccat_connect()
304 	if (!device)  in roccat_connect()
316 		devices[minor] = device;  in roccat_connect()
319 		kfree(device);  in roccat_connect()
323 	device->dev = device_create(klass, &hid->dev,  in roccat_connect()
327 	if (IS_ERR(device->dev)) {  in roccat_connect()
330 		temp = PTR_ERR(device->dev);  in roccat_connect()
331 		kfree(device);  in roccat_connect()
337 	init_waitqueue_head(&device->wait);  in roccat_connect()
338 	INIT_LIST_HEAD(&device->readers);  in roccat_connect()
339 	mutex_init(&device->readers_lock);  in roccat_connect()
340 	mutex_init(&device->cbuf_lock);  in roccat_connect()
341 	device->minor = minor;  in roccat_connect()
342 	device->hid = hid;  in roccat_connect()
343 	device->exist = 1;  in roccat_connect()
344 	device->cbuf_end = 0;  in roccat_connect()
345 	device->report_size = report_size;  in roccat_connect()
351 /* roccat_disconnect() - remove char device from hid device
352  * @minor: the minor device number returned by roccat_connect()
356 	struct roccat_device *device;  in roccat_disconnect()  local
359 	device = devices[minor];  in roccat_disconnect()
362 	device->exist = 0; /* TODO exist maybe not needed */  in roccat_disconnect()
364 	device_destroy(device->dev->class, MKDEV(roccat_major, minor));  in roccat_disconnect()
370 	if (device->open) {  in roccat_disconnect()
371 		hid_hw_close(device->hid);  in roccat_disconnect()
372 		wake_up_interruptible(&device->wait);  in roccat_disconnect()
374 		kfree(device);  in roccat_disconnect()
382 	struct roccat_device *device;  in roccat_ioctl()  local
388 	device = devices[minor];  in roccat_ioctl()
389 	if (!device) {  in roccat_ioctl()
396 		if (put_user(device->report_size, (int __user *)arg))  in roccat_ioctl()
450 MODULE_DESCRIPTION("USB Roccat char device");