1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Line 6 Linux USB driver
  4 *
  5 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
  6 */
  7
  8#include <linux/kernel.h>
  9#include <linux/module.h>
 10#include <linux/export.h>
 11#include <linux/slab.h>
 12#include <linux/usb.h>
 13
 14#include <sound/core.h>
 15#include <sound/initval.h>
 16#include <sound/hwdep.h>
 17
 18#include "capture.h"
 19#include "driver.h"
 20#include "midi.h"
 21#include "playback.h"
 22
 23#define DRIVER_AUTHOR  "Markus Grabner <grabner@icg.tugraz.at>"
 24#define DRIVER_DESC    "Line 6 USB Driver"
 25
 26/*
 27	This is Line 6's MIDI manufacturer ID.
 28*/
 29const unsigned char line6_midi_id[3] = {
 30	0x00, 0x01, 0x0c
 31};
 32EXPORT_SYMBOL_GPL(line6_midi_id);
 33
 34/*
 35	Code to request version of POD, Variax interface
 36	(and maybe other devices).
 37*/
 38static const char line6_request_version[] = {
 39	0xf0, 0x7e, 0x7f, 0x06, 0x01, 0xf7
 40};
 41
 42/*
 43	 Class for asynchronous messages.
 44*/
 45struct message {
 46	struct usb_line6 *line6;
 47	const char *buffer;
 48	int size;
 49	int done;
 50};
 51
 52/*
 53	Forward declarations.
 54*/
 55static void line6_data_received(struct urb *urb);
 56static int line6_send_raw_message_async_part(struct message *msg,
 57					     struct urb *urb);
 58
 59/*
 60	Start to listen on endpoint.
 61*/
 62static int line6_start_listen(struct usb_line6 *line6)
 63{
 64	int err;
 65
 66	if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
 67		usb_fill_int_urb(line6->urb_listen, line6->usbdev,
 68			usb_rcvintpipe(line6->usbdev, line6->properties->ep_ctrl_r),
 69			line6->buffer_listen, LINE6_BUFSIZE_LISTEN,
 70			line6_data_received, line6, line6->interval);
 71	} else {
 72		usb_fill_bulk_urb(line6->urb_listen, line6->usbdev,
 73			usb_rcvbulkpipe(line6->usbdev, line6->properties->ep_ctrl_r),
 74			line6->buffer_listen, LINE6_BUFSIZE_LISTEN,
 75			line6_data_received, line6);
 76	}
 77
 78	/* sanity checks of EP before actually submitting */
 79	if (usb_urb_ep_type_check(line6->urb_listen)) {
 80		dev_err(line6->ifcdev, "invalid control EP\n");
 81		return -EINVAL;
 82	}
 83
 84	line6->urb_listen->actual_length = 0;
 85	err = usb_submit_urb(line6->urb_listen, GFP_ATOMIC);
 86	return err;
 87}
 88
 89/*
 90	Stop listening on endpoint.
 91*/
 92static void line6_stop_listen(struct usb_line6 *line6)
 93{
 94	usb_kill_urb(line6->urb_listen);
 95}
 96
 97/*
 98	Send raw message in pieces of wMaxPacketSize bytes.
 99*/
100int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
101				  int size)
102{
103	int i, done = 0;
104	const struct line6_properties *properties = line6->properties;
105
106	for (i = 0; i < size; i += line6->max_packet_size) {
107		int partial;
108		const char *frag_buf = buffer + i;
109		int frag_size = min(line6->max_packet_size, size - i);
110		int retval;
111
112		if (properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
113			retval = usb_interrupt_msg(line6->usbdev,
114						usb_sndintpipe(line6->usbdev, properties->ep_ctrl_w),
115						(char *)frag_buf, frag_size,
116						&partial, LINE6_TIMEOUT * HZ);
117		} else {
118			retval = usb_bulk_msg(line6->usbdev,
119						usb_sndbulkpipe(line6->usbdev, properties->ep_ctrl_w),
120						(char *)frag_buf, frag_size,
121						&partial, LINE6_TIMEOUT * HZ);
122		}
123
124		if (retval) {
125			dev_err(line6->ifcdev,
126				"usb_bulk_msg failed (%d)\n", retval);
127			break;
128		}
129
130		done += frag_size;
131	}
132
133	return done;
134}
135EXPORT_SYMBOL_GPL(line6_send_raw_message);
136
137/*
138	Notification of completion of asynchronous request transmission.
139*/
140static void line6_async_request_sent(struct urb *urb)
141{
142	struct message *msg = (struct message *)urb->context;
143
144	if (msg->done >= msg->size) {
145		usb_free_urb(urb);
146		kfree(msg);
147	} else
148		line6_send_raw_message_async_part(msg, urb);
149}
150
151/*
152	Asynchronously send part of a raw message.
153*/
154static int line6_send_raw_message_async_part(struct message *msg,
155					     struct urb *urb)
156{
157	int retval;
158	struct usb_line6 *line6 = msg->line6;
159	int done = msg->done;
160	int bytes = min(msg->size - done, line6->max_packet_size);
161
162	if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
163		usb_fill_int_urb(urb, line6->usbdev,
164			usb_sndintpipe(line6->usbdev, line6->properties->ep_ctrl_w),
165			(char *)msg->buffer + done, bytes,
166			line6_async_request_sent, msg, line6->interval);
167	} else {
168		usb_fill_bulk_urb(urb, line6->usbdev,
169			usb_sndbulkpipe(line6->usbdev, line6->properties->ep_ctrl_w),
170			(char *)msg->buffer + done, bytes,
171			line6_async_request_sent, msg);
172	}
173
174	msg->done += bytes;
175
176	/* sanity checks of EP before actually submitting */
177	retval = usb_urb_ep_type_check(urb);
178	if (retval < 0)
179		goto error;
180
181	retval = usb_submit_urb(urb, GFP_ATOMIC);
182	if (retval < 0)
183		goto error;
184
185	return 0;
186
187 error:
188	dev_err(line6->ifcdev, "%s: usb_submit_urb failed (%d)\n",
189		__func__, retval);
190	usb_free_urb(urb);
191	kfree(msg);
192	return retval;
193}
194
195/*
196	Asynchronously send raw message.
197*/
198int line6_send_raw_message_async(struct usb_line6 *line6, const char *buffer,
199				 int size)
200{
201	struct message *msg;
202	struct urb *urb;
203
204	/* create message: */
205	msg = kmalloc(sizeof(struct message), GFP_ATOMIC);
206	if (msg == NULL)
207		return -ENOMEM;
208
209	/* create URB: */
210	urb = usb_alloc_urb(0, GFP_ATOMIC);
211
212	if (urb == NULL) {
213		kfree(msg);
214		return -ENOMEM;
215	}
216
217	/* set message data: */
218	msg->line6 = line6;
219	msg->buffer = buffer;
220	msg->size = size;
221	msg->done = 0;
222
223	/* start sending: */
224	return line6_send_raw_message_async_part(msg, urb);
225}
226EXPORT_SYMBOL_GPL(line6_send_raw_message_async);
227
228/*
229	Send asynchronous device version request.
230*/
231int line6_version_request_async(struct usb_line6 *line6)
232{
233	char *buffer;
234	int retval;
235
236	buffer = kmemdup(line6_request_version,
237			sizeof(line6_request_version), GFP_ATOMIC);
238	if (buffer == NULL)
239		return -ENOMEM;
240
241	retval = line6_send_raw_message_async(line6, buffer,
242					      sizeof(line6_request_version));
243	kfree(buffer);
244	return retval;
245}
246EXPORT_SYMBOL_GPL(line6_version_request_async);
247
248/*
249	Send sysex message in pieces of wMaxPacketSize bytes.
250*/
251int line6_send_sysex_message(struct usb_line6 *line6, const char *buffer,
252			     int size)
253{
254	return line6_send_raw_message(line6, buffer,
255				      size + SYSEX_EXTRA_SIZE) -
256	    SYSEX_EXTRA_SIZE;
257}
258EXPORT_SYMBOL_GPL(line6_send_sysex_message);
259
260/*
261	Allocate buffer for sysex message and prepare header.
262	@param code sysex message code
263	@param size number of bytes between code and sysex end
264*/
265char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1, int code2,
266			       int size)
267{
268	char *buffer = kmalloc(size + SYSEX_EXTRA_SIZE, GFP_ATOMIC);
269
270	if (!buffer)
271		return NULL;
272
273	buffer[0] = LINE6_SYSEX_BEGIN;
274	memcpy(buffer + 1, line6_midi_id, sizeof(line6_midi_id));
275	buffer[sizeof(line6_midi_id) + 1] = code1;
276	buffer[sizeof(line6_midi_id) + 2] = code2;
277	buffer[sizeof(line6_midi_id) + 3 + size] = LINE6_SYSEX_END;
278	return buffer;
279}
280EXPORT_SYMBOL_GPL(line6_alloc_sysex_buffer);
281
282/*
283	Notification of data received from the Line 6 device.
284*/
285static void line6_data_received(struct urb *urb)
286{
287	struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
288	struct midi_buffer *mb = &line6->line6midi->midibuf_in;
289	int done;
290
291	if (urb->status == -ESHUTDOWN)
292		return;
293
294	if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
295		done =
296			line6_midibuf_write(mb, urb->transfer_buffer, urb->actual_length);
297
298		if (done < urb->actual_length) {
299			line6_midibuf_ignore(mb, done);
300			dev_dbg(line6->ifcdev, "%d %d buffer overflow - message skipped\n",
301				done, urb->actual_length);
302		}
303
304		for (;;) {
305			done =
306				line6_midibuf_read(mb, line6->buffer_message,
307						LINE6_MIDI_MESSAGE_MAXLEN);
308
309			if (done <= 0)
310				break;
311
312			line6->message_length = done;
313			line6_midi_receive(line6, line6->buffer_message, done);
314
315			if (line6->process_message)
316				line6->process_message(line6);
317		}
318	} else {
319		line6->buffer_message = urb->transfer_buffer;
320		line6->message_length = urb->actual_length;
321		if (line6->process_message)
322			line6->process_message(line6);
323		line6->buffer_message = NULL;
324	}
325
326	line6_start_listen(line6);
327}
328
329#define LINE6_READ_WRITE_STATUS_DELAY 2  /* milliseconds */
330#define LINE6_READ_WRITE_MAX_RETRIES 50
331
332/*
333	Read data from device.
334*/
335int line6_read_data(struct usb_line6 *line6, unsigned address, void *data,
336		    unsigned datalen)
337{
338	struct usb_device *usbdev = line6->usbdev;
339	int ret;
340	unsigned char *len;
341	unsigned count;
342
343	if (address > 0xffff || datalen > 0xff)
344		return -EINVAL;
345
346	len = kmalloc(1, GFP_KERNEL);
347	if (!len)
348		return -ENOMEM;
349
350	/* query the serial number: */
351	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
352			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
353			      (datalen << 8) | 0x21, address,
354			      NULL, 0, LINE6_TIMEOUT * HZ);
355
356	if (ret < 0) {
357		dev_err(line6->ifcdev, "read request failed (error %d)\n", ret);
358		goto exit;
359	}
360
361	/* Wait for data length. We'll get 0xff until length arrives. */
362	for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) {
363		mdelay(LINE6_READ_WRITE_STATUS_DELAY);
364
365		ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
366				      USB_TYPE_VENDOR | USB_RECIP_DEVICE |
367				      USB_DIR_IN,
368				      0x0012, 0x0000, len, 1,
369				      LINE6_TIMEOUT * HZ);
370		if (ret < 0) {
371			dev_err(line6->ifcdev,
372				"receive length failed (error %d)\n", ret);
373			goto exit;
374		}
375
376		if (*len != 0xff)
377			break;
378	}
379
380	ret = -EIO;
381	if (*len == 0xff) {
382		dev_err(line6->ifcdev, "read failed after %d retries\n",
383			count);
384		goto exit;
385	} else if (*len != datalen) {
386		/* should be equal or something went wrong */
387		dev_err(line6->ifcdev,
388			"length mismatch (expected %d, got %d)\n",
389			(int)datalen, (int)*len);
390		goto exit;
391	}
392
393	/* receive the result: */
394	ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
395			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
396			      0x0013, 0x0000, data, datalen,
397			      LINE6_TIMEOUT * HZ);
398
399	if (ret < 0)
400		dev_err(line6->ifcdev, "read failed (error %d)\n", ret);
401
402exit:
403	kfree(len);
404	return ret;
405}
406EXPORT_SYMBOL_GPL(line6_read_data);
407
408/*
409	Write data to device.
410*/
411int line6_write_data(struct usb_line6 *line6, unsigned address, void *data,
412		     unsigned datalen)
413{
414	struct usb_device *usbdev = line6->usbdev;
415	int ret;
416	unsigned char *status;
417	int count;
418
419	if (address > 0xffff || datalen > 0xffff)
420		return -EINVAL;
421
422	status = kmalloc(1, GFP_KERNEL);
423	if (!status)
424		return -ENOMEM;
425
426	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
427			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
428			      0x0022, address, data, datalen,
429			      LINE6_TIMEOUT * HZ);
430
431	if (ret < 0) {
432		dev_err(line6->ifcdev,
433			"write request failed (error %d)\n", ret);
434		goto exit;
435	}
436
437	for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) {
438		mdelay(LINE6_READ_WRITE_STATUS_DELAY);
439
440		ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
441				      0x67,
442				      USB_TYPE_VENDOR | USB_RECIP_DEVICE |
443				      USB_DIR_IN,
444				      0x0012, 0x0000,
445				      status, 1, LINE6_TIMEOUT * HZ);
446
447		if (ret < 0) {
448			dev_err(line6->ifcdev,
449				"receiving status failed (error %d)\n", ret);
450			goto exit;
451		}
452
453		if (*status != 0xff)
454			break;
455	}
456
457	if (*status == 0xff) {
458		dev_err(line6->ifcdev, "write failed after %d retries\n",
459			count);
460		ret = -EIO;
461	} else if (*status != 0) {
462		dev_err(line6->ifcdev, "write failed (error %d)\n", ret);
463		ret = -EIO;
464	}
465exit:
466	kfree(status);
467	return ret;
468}
469EXPORT_SYMBOL_GPL(line6_write_data);
470
471/*
472	Read Line 6 device serial number.
473	(POD, TonePort, GuitarPort)
474*/
475int line6_read_serial_number(struct usb_line6 *line6, u32 *serial_number)
476{
477	return line6_read_data(line6, 0x80d0, serial_number,
478			       sizeof(*serial_number));
479}
480EXPORT_SYMBOL_GPL(line6_read_serial_number);
481
482/*
483	Card destructor.
484*/
485static void line6_destruct(struct snd_card *card)
486{
487	struct usb_line6 *line6 = card->private_data;
488	struct usb_device *usbdev = line6->usbdev;
489
490	/* Free buffer memory first. We cannot depend on the existence of private
491	 * data from the (podhd) module, it may be gone already during this call
492	 */
493	kfree(line6->buffer_message);
494
495	kfree(line6->buffer_listen);
496
497	/* then free URBs: */
498	usb_free_urb(line6->urb_listen);
499	line6->urb_listen = NULL;
500
501	/* decrement reference counters: */
502	usb_put_dev(usbdev);
503}
504
505static void line6_get_usb_properties(struct usb_line6 *line6)
506{
507	struct usb_device *usbdev = line6->usbdev;
508	const struct line6_properties *properties = line6->properties;
509	int pipe;
510	struct usb_host_endpoint *ep = NULL;
511
512	if (properties->capabilities & LINE6_CAP_CONTROL) {
513		if (properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
514			pipe = usb_rcvintpipe(line6->usbdev,
515				line6->properties->ep_ctrl_r);
516		} else {
517			pipe = usb_rcvbulkpipe(line6->usbdev,
518				line6->properties->ep_ctrl_r);
519		}
520		ep = usbdev->ep_in[usb_pipeendpoint(pipe)];
521	}
522
523	/* Control data transfer properties */
524	if (ep) {
525		line6->interval = ep->desc.bInterval;
526		line6->max_packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
527	} else {
528		if (properties->capabilities & LINE6_CAP_CONTROL) {
529			dev_err(line6->ifcdev,
530				"endpoint not available, using fallback values");
531		}
532		line6->interval = LINE6_FALLBACK_INTERVAL;
533		line6->max_packet_size = LINE6_FALLBACK_MAXPACKETSIZE;
534	}
535
536	/* Isochronous transfer properties */
537	if (usbdev->speed == USB_SPEED_LOW) {
538		line6->intervals_per_second = USB_LOW_INTERVALS_PER_SECOND;
539		line6->iso_buffers = USB_LOW_ISO_BUFFERS;
540	} else {
541		line6->intervals_per_second = USB_HIGH_INTERVALS_PER_SECOND;
542		line6->iso_buffers = USB_HIGH_ISO_BUFFERS;
543	}
544}
545
546/* Enable buffering of incoming messages, flush the buffer */
547static int line6_hwdep_open(struct snd_hwdep *hw, struct file *file)
548{
549	struct usb_line6 *line6 = hw->private_data;
550
551	/* NOTE: hwdep layer provides atomicity here */
552
553	line6->messages.active = 1;
554	line6->messages.nonblock = file->f_flags & O_NONBLOCK ? 1 : 0;
555
556	return 0;
557}
558
559/* Stop buffering */
560static int line6_hwdep_release(struct snd_hwdep *hw, struct file *file)
561{
562	struct usb_line6 *line6 = hw->private_data;
563
564	line6->messages.active = 0;
565
566	return 0;
567}
568
569/* Read from circular buffer, return to user */
570static long
571line6_hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
572					loff_t *offset)
573{
574	struct usb_line6 *line6 = hwdep->private_data;
575	long rv = 0;
576	unsigned int out_count;
577
578	if (mutex_lock_interruptible(&line6->messages.read_lock))
579		return -ERESTARTSYS;
580
581	while (kfifo_len(&line6->messages.fifo) == 0) {
582		mutex_unlock(&line6->messages.read_lock);
583
584		if (line6->messages.nonblock)
585			return -EAGAIN;
586
587		rv = wait_event_interruptible(
588			line6->messages.wait_queue,
589			kfifo_len(&line6->messages.fifo) != 0);
590		if (rv < 0)
591			return rv;
592
593		if (mutex_lock_interruptible(&line6->messages.read_lock))
594			return -ERESTARTSYS;
595	}
596
597	if (kfifo_peek_len(&line6->messages.fifo) > count) {
598		/* Buffer too small; allow re-read of the current item... */
599		rv = -EINVAL;
600	} else {
601		rv = kfifo_to_user(&line6->messages.fifo, buf, count, &out_count);
602		if (rv == 0)
603			rv = out_count;
604	}
605
606	mutex_unlock(&line6->messages.read_lock);
607	return rv;
608}
609
610/* Write directly (no buffering) to device by user*/
611static long
612line6_hwdep_write(struct snd_hwdep *hwdep, const char __user *data, long count,
613					loff_t *offset)
614{
615	struct usb_line6 *line6 = hwdep->private_data;
616	int rv;
617	char *data_copy;
618
619	if (count > line6->max_packet_size * LINE6_RAW_MESSAGES_MAXCOUNT) {
620		/* This is an arbitrary limit - still better than nothing... */
621		return -EINVAL;
622	}
623
624	data_copy = memdup_user(data, count);
625	if (IS_ERR(data_copy))
626		return PTR_ERR(data_copy);
627
628	rv = line6_send_raw_message(line6, data_copy, count);
629
630	kfree(data_copy);
631	return rv;
632}
633
634static __poll_t
635line6_hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait)
636{
637	__poll_t rv;
638	struct usb_line6 *line6 = hwdep->private_data;
639
640	poll_wait(file, &line6->messages.wait_queue, wait);
641
642	mutex_lock(&line6->messages.read_lock);
643	rv = kfifo_len(&line6->messages.fifo) == 0 ? 0 : EPOLLIN | EPOLLRDNORM;
644	mutex_unlock(&line6->messages.read_lock);
645
646	return rv;
647}
648
649static const struct snd_hwdep_ops hwdep_ops = {
650	.open    = line6_hwdep_open,
651	.release = line6_hwdep_release,
652	.read    = line6_hwdep_read,
653	.write   = line6_hwdep_write,
654	.poll    = line6_hwdep_poll,
655};
656
657/* Insert into circular buffer */
658static void line6_hwdep_push_message(struct usb_line6 *line6)
659{
660	if (!line6->messages.active)
661		return;
662
663	if (kfifo_avail(&line6->messages.fifo) >= line6->message_length) {
664		/* No race condition here, there's only one writer */
665		kfifo_in(&line6->messages.fifo,
666			line6->buffer_message, line6->message_length);
667	} /* else TODO: signal overflow */
668
669	wake_up_interruptible(&line6->messages.wait_queue);
670}
671
672static int line6_hwdep_init(struct usb_line6 *line6)
673{
674	int err;
675	struct snd_hwdep *hwdep;
676
677	/* TODO: usb_driver_claim_interface(); */
678	line6->process_message = line6_hwdep_push_message;
679	line6->messages.active = 0;
680	init_waitqueue_head(&line6->messages.wait_queue);
681	mutex_init(&line6->messages.read_lock);
682	INIT_KFIFO(line6->messages.fifo);
683
684	err = snd_hwdep_new(line6->card, "config", 0, &hwdep);
685	if (err < 0)
686		goto end;
687	strcpy(hwdep->name, "config");
688	hwdep->iface = SNDRV_HWDEP_IFACE_LINE6;
689	hwdep->ops = hwdep_ops;
690	hwdep->private_data = line6;
691	hwdep->exclusive = true;
692
693end:
694	return err;
695}
696
697static int line6_init_cap_control(struct usb_line6 *line6)
698{
699	int ret;
700
701	/* initialize USB buffers: */
702	line6->buffer_listen = kmalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
703	if (!line6->buffer_listen)
704		return -ENOMEM;
705
706	line6->urb_listen = usb_alloc_urb(0, GFP_KERNEL);
707	if (!line6->urb_listen)
708		return -ENOMEM;
709
710	if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
711		line6->buffer_message = kmalloc(LINE6_MIDI_MESSAGE_MAXLEN, GFP_KERNEL);
712		if (!line6->buffer_message)
713			return -ENOMEM;
 
 
 
 
714	} else {
715		ret = line6_hwdep_init(line6);
716		if (ret < 0)
717			return ret;
718	}
719
720	ret = line6_start_listen(line6);
721	if (ret < 0) {
722		dev_err(line6->ifcdev, "cannot start listening: %d\n", ret);
723		return ret;
724	}
725
726	return 0;
727}
728
729static void line6_startup_work(struct work_struct *work)
730{
731	struct usb_line6 *line6 =
732		container_of(work, struct usb_line6, startup_work.work);
733
734	if (line6->startup)
735		line6->startup(line6);
736}
737
738/*
739	Probe USB device.
740*/
741int line6_probe(struct usb_interface *interface,
742		const struct usb_device_id *id,
743		const char *driver_name,
744		const struct line6_properties *properties,
745		int (*private_init)(struct usb_line6 *, const struct usb_device_id *id),
746		size_t data_size)
747{
748	struct usb_device *usbdev = interface_to_usbdev(interface);
749	struct snd_card *card;
750	struct usb_line6 *line6;
751	int interface_number;
752	int ret;
753
754	if (WARN_ON(data_size < sizeof(*line6)))
755		return -EINVAL;
756
757	/* we don't handle multiple configurations */
758	if (usbdev->descriptor.bNumConfigurations != 1)
759		return -ENODEV;
760
761	ret = snd_card_new(&interface->dev,
762			   SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
763			   THIS_MODULE, data_size, &card);
764	if (ret < 0)
765		return ret;
766
767	/* store basic data: */
768	line6 = card->private_data;
769	line6->card = card;
770	line6->properties = properties;
771	line6->usbdev = usbdev;
772	line6->ifcdev = &interface->dev;
773	INIT_DELAYED_WORK(&line6->startup_work, line6_startup_work);
774
775	strcpy(card->id, properties->id);
776	strcpy(card->driver, driver_name);
777	strcpy(card->shortname, properties->name);
778	sprintf(card->longname, "Line 6 %s at USB %s", properties->name,
779		dev_name(line6->ifcdev));
780	card->private_free = line6_destruct;
781
782	usb_set_intfdata(interface, line6);
783
784	/* increment reference counters: */
785	usb_get_dev(usbdev);
786
787	/* initialize device info: */
788	dev_info(&interface->dev, "Line 6 %s found\n", properties->name);
789
790	/* query interface number */
791	interface_number = interface->cur_altsetting->desc.bInterfaceNumber;
792
793	/* TODO reserves the bus bandwidth even without actual transfer */
794	ret = usb_set_interface(usbdev, interface_number,
795				properties->altsetting);
796	if (ret < 0) {
797		dev_err(&interface->dev, "set_interface failed\n");
798		goto error;
799	}
800
801	line6_get_usb_properties(line6);
802
803	if (properties->capabilities & LINE6_CAP_CONTROL) {
804		ret = line6_init_cap_control(line6);
805		if (ret < 0)
806			goto error;
807	}
808
809	/* initialize device data based on device: */
810	ret = private_init(line6, id);
811	if (ret < 0)
812		goto error;
813
814	/* creation of additional special files should go here */
815
816	dev_info(&interface->dev, "Line 6 %s now attached\n",
817		 properties->name);
818
819	return 0;
820
821 error:
822	/* we can call disconnect callback here because no close-sync is
823	 * needed yet at this point
824	 */
825	line6_disconnect(interface);
826	return ret;
827}
828EXPORT_SYMBOL_GPL(line6_probe);
829
830/*
831	Line 6 device disconnected.
832*/
833void line6_disconnect(struct usb_interface *interface)
834{
835	struct usb_line6 *line6 = usb_get_intfdata(interface);
836	struct usb_device *usbdev = interface_to_usbdev(interface);
837
838	if (!line6)
839		return;
840
841	if (WARN_ON(usbdev != line6->usbdev))
842		return;
843
844	cancel_delayed_work_sync(&line6->startup_work);
845
846	if (line6->urb_listen != NULL)
847		line6_stop_listen(line6);
848
849	snd_card_disconnect(line6->card);
850	if (line6->line6pcm)
851		line6_pcm_disconnect(line6->line6pcm);
852	if (line6->disconnect)
853		line6->disconnect(line6);
854
855	dev_info(&interface->dev, "Line 6 %s now disconnected\n",
856		 line6->properties->name);
857
858	/* make sure the device isn't destructed twice: */
859	usb_set_intfdata(interface, NULL);
860
861	snd_card_free_when_closed(line6->card);
862}
863EXPORT_SYMBOL_GPL(line6_disconnect);
864
865#ifdef CONFIG_PM
866
867/*
868	Suspend Line 6 device.
869*/
870int line6_suspend(struct usb_interface *interface, pm_message_t message)
871{
872	struct usb_line6 *line6 = usb_get_intfdata(interface);
873	struct snd_line6_pcm *line6pcm = line6->line6pcm;
874
875	snd_power_change_state(line6->card, SNDRV_CTL_POWER_D3hot);
876
877	if (line6->properties->capabilities & LINE6_CAP_CONTROL)
878		line6_stop_listen(line6);
879
880	if (line6pcm != NULL)
881		line6pcm->flags = 0;
882
883	return 0;
884}
885EXPORT_SYMBOL_GPL(line6_suspend);
886
887/*
888	Resume Line 6 device.
889*/
890int line6_resume(struct usb_interface *interface)
891{
892	struct usb_line6 *line6 = usb_get_intfdata(interface);
893
894	if (line6->properties->capabilities & LINE6_CAP_CONTROL)
895		line6_start_listen(line6);
896
897	snd_power_change_state(line6->card, SNDRV_CTL_POWER_D0);
898	return 0;
899}
900EXPORT_SYMBOL_GPL(line6_resume);
901
902#endif /* CONFIG_PM */
903
904MODULE_AUTHOR(DRIVER_AUTHOR);
905MODULE_DESCRIPTION(DRIVER_DESC);
906MODULE_LICENSE("GPL");
907