12  * Module roccat is a char device used to report special events of roccat
15  * not stored in device. The information in these events depends on hid device
45 	struct device *dev;
62 	struct roccat_device *device;  member
77 	struct roccat_device *device = reader->device;  in roccat_read()  local
82 	mutex_lock(&device->cbuf_lock);  in roccat_read()
85 	if (reader->cbuf_start == device->cbuf_end) {  in roccat_read()
86 		add_wait_queue(&device->wait, &wait);  in roccat_read()
90 		while (reader->cbuf_start == device->cbuf_end) {  in roccat_read()
99 			if (!device->exist) {  in roccat_read()
104 			mutex_unlock(&device->cbuf_lock);  in roccat_read()
106 			mutex_lock(&device->cbuf_lock);  in roccat_read()
111 		remove_wait_queue(&device->wait, &wait);  in roccat_read()
118 	report = &device->cbuf[reader->cbuf_start];  in roccat_read()
123 	len = device->report_size > count ? count : device->report_size;  in roccat_read()
133 	mutex_unlock(&device->cbuf_lock);  in roccat_read()
140 	poll_wait(file, &reader->device->wait, wait);  in roccat_poll()
141 	if (reader->cbuf_start != reader->device->cbuf_end)  in roccat_poll()
143 	if (!reader->device->exist)  in roccat_poll()
152 	struct roccat_device *device;  in roccat_open()  local
161 	device = devices[minor];  in roccat_open()
163 	if (!device) {  in roccat_open()
164 		pr_emerg("roccat device with minor %d doesn't exist\n", minor);  in roccat_open()
169 	mutex_lock(&device->readers_lock);  in roccat_open()
171 	if (!device->open++) {  in roccat_open()
172 		/* power on device on adding first reader */  in roccat_open()
173 		error = hid_hw_power(device->hid, PM_HINT_FULLON);  in roccat_open()
175 			--device->open;  in roccat_open()
179 		error = hid_hw_open(device->hid);  in roccat_open()
181 			hid_hw_power(device->hid, PM_HINT_NORMAL);  in roccat_open()
182 			--device->open;  in roccat_open()
187 	reader->device = device;  in roccat_open()
189 	reader->cbuf_start = device->cbuf_end;  in roccat_open()
191 	list_add_tail(&reader->node, &device->readers);  in roccat_open()
195 	mutex_unlock(&device->readers_lock);  in roccat_open()
207 	struct roccat_device *device;  in roccat_release()  local
211 	device = devices[minor];  in roccat_release()
212 	if (!device) {  in roccat_release()
214 		pr_emerg("roccat device with minor %d doesn't exist\n", minor);  in roccat_release()
218 	mutex_lock(&device->readers_lock);  in roccat_release()
220 	mutex_unlock(&device->readers_lock);  in roccat_release()
223 	if (!--device->open) {  in roccat_release()
225 		if (device->exist) {  in roccat_release()
226 			hid_hw_power(device->hid, PM_HINT_NORMAL);  in roccat_release()
227 			hid_hw_close(device->hid);  in roccat_release()
229 			kfree(device);  in roccat_release()
240  * @minor: minor device number returned by roccat_connect()
249 	struct roccat_device *device;  in roccat_report_event()  local
254 	device = devices[minor];  in roccat_report_event()
256 	new_value = kmemdup(data, device->report_size, GFP_ATOMIC);  in roccat_report_event()
260 	mutex_lock(&device->cbuf_lock);  in roccat_report_event()
262 	report = &device->cbuf[device->cbuf_end];  in roccat_report_event()
268 	device->cbuf_end = (device->cbuf_end + 1) % ROCCAT_CBUF_SIZE;  in roccat_report_event()
270 	list_for_each_entry(reader, &device->readers, node) {  in roccat_report_event()
277 		if (reader->cbuf_start == device->cbuf_end)  in roccat_report_event()
281 	mutex_unlock(&device->cbuf_lock);  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.
295  * Return value is minor device number in Range [0, ROCCAT_MAX_DEVICES] on
301 	struct roccat_device *device;  in roccat_connect()  local
304 	device = kzalloc(sizeof(struct roccat_device), GFP_KERNEL);  in roccat_connect()
305 	if (!device)  in roccat_connect()
317 		devices[minor] = device;  in roccat_connect()
320 		kfree(device);  in roccat_connect()
324 	device->dev = device_create(klass, &hid->dev,  in roccat_connect()
328 	if (IS_ERR(device->dev)) {  in roccat_connect()
331 		temp = PTR_ERR(device->dev);  in roccat_connect()
332 		kfree(device);  in roccat_connect()
338 	init_waitqueue_head(&device->wait);  in roccat_connect()
339 	INIT_LIST_HEAD(&device->readers);  in roccat_connect()
340 	mutex_init(&device->readers_lock);  in roccat_connect()
341 	mutex_init(&device->cbuf_lock);  in roccat_connect()
342 	device->minor = minor;  in roccat_connect()
343 	device->hid = hid;  in roccat_connect()
344 	device->exist = 1;  in roccat_connect()
345 	device->cbuf_end = 0;  in roccat_connect()
346 	device->report_size = report_size;  in roccat_connect()
352 /* roccat_disconnect() - remove char device from hid device
353  * @minor: the minor device number returned by roccat_connect()
357 	struct roccat_device *device;  in roccat_disconnect()  local
360 	device = devices[minor];  in roccat_disconnect()
363 	device->exist = 0; /* TODO exist maybe not needed */  in roccat_disconnect()
365 	device_destroy(device->dev->class, MKDEV(roccat_major, minor));  in roccat_disconnect()
371 	if (device->open) {  in roccat_disconnect()
372 		hid_hw_close(device->hid);  in roccat_disconnect()
373 		wake_up_interruptible(&device->wait);  in roccat_disconnect()
375 		kfree(device);  in roccat_disconnect()
383 	struct roccat_device *device;  in roccat_ioctl()  local
389 	device = devices[minor];  in roccat_ioctl()
390 	if (!device) {  in roccat_ioctl()
397 		if (put_user(device->report_size, (int __user *)arg))  in roccat_ioctl()
460 MODULE_DESCRIPTION("USB Roccat char device");