xref: /openbmc/linux/sound/usb/line6/driver.c (revision 6ccd93bdb989507717edb375d40534f1177822c5)
1 /*
2  * Line 6 Linux USB driver
3  *
4  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
5  *
6  *	This program is free software; you can redistribute it and/or
7  *	modify it under the terms of the GNU General Public License as
8  *	published by the Free Software Foundation, version 2.
9  *
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/export.h>
15 #include <linux/slab.h>
16 #include <linux/usb.h>
17 
18 #include <sound/core.h>
19 #include <sound/initval.h>
20 
21 #include "capture.h"
22 #include "driver.h"
23 #include "midi.h"
24 #include "playback.h"
25 
26 #define DRIVER_AUTHOR  "Markus Grabner <grabner@icg.tugraz.at>"
27 #define DRIVER_DESC    "Line 6 USB Driver"
28 
29 /*
30 	This is Line 6's MIDI manufacturer ID.
31 */
32 const unsigned char line6_midi_id[] = {
33 	0x00, 0x01, 0x0c
34 };
35 EXPORT_SYMBOL_GPL(line6_midi_id);
36 
37 /*
38 	Code to request version of POD, Variax interface
39 	(and maybe other devices).
40 */
41 static const char line6_request_version[] = {
42 	0xf0, 0x7e, 0x7f, 0x06, 0x01, 0xf7
43 };
44 
45 /*
46 	 Class for asynchronous messages.
47 */
48 struct message {
49 	struct usb_line6 *line6;
50 	const char *buffer;
51 	int size;
52 	int done;
53 };
54 
55 /*
56 	Forward declarations.
57 */
58 static void line6_data_received(struct urb *urb);
59 static int line6_send_raw_message_async_part(struct message *msg,
60 					     struct urb *urb);
61 
62 /*
63 	Start to listen on endpoint.
64 */
65 static int line6_start_listen(struct usb_line6 *line6)
66 {
67 	int err;
68 
69 	usb_fill_int_urb(line6->urb_listen, line6->usbdev,
70 		usb_rcvintpipe(line6->usbdev, line6->properties->ep_ctrl_r),
71 		line6->buffer_listen, LINE6_BUFSIZE_LISTEN,
72 		line6_data_received, line6, line6->interval);
73 	line6->urb_listen->actual_length = 0;
74 	err = usb_submit_urb(line6->urb_listen, GFP_ATOMIC);
75 	return err;
76 }
77 
78 /*
79 	Stop listening on endpoint.
80 */
81 static void line6_stop_listen(struct usb_line6 *line6)
82 {
83 	usb_kill_urb(line6->urb_listen);
84 }
85 
86 /*
87 	Send raw message in pieces of wMaxPacketSize bytes.
88 */
89 static int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
90 				  int size)
91 {
92 	int i, done = 0;
93 
94 	for (i = 0; i < size; i += line6->max_packet_size) {
95 		int partial;
96 		const char *frag_buf = buffer + i;
97 		int frag_size = min(line6->max_packet_size, size - i);
98 		int retval;
99 
100 		retval = usb_interrupt_msg(line6->usbdev,
101 					usb_sndintpipe(line6->usbdev,
102 						line6->properties->ep_ctrl_w),
103 					(char *)frag_buf, frag_size,
104 					&partial, LINE6_TIMEOUT * HZ);
105 
106 		if (retval) {
107 			dev_err(line6->ifcdev,
108 				"usb_interrupt_msg failed (%d)\n", retval);
109 			break;
110 		}
111 
112 		done += frag_size;
113 	}
114 
115 	return done;
116 }
117 
118 /*
119 	Notification of completion of asynchronous request transmission.
120 */
121 static void line6_async_request_sent(struct urb *urb)
122 {
123 	struct message *msg = (struct message *)urb->context;
124 
125 	if (msg->done >= msg->size) {
126 		usb_free_urb(urb);
127 		kfree(msg);
128 	} else
129 		line6_send_raw_message_async_part(msg, urb);
130 }
131 
132 /*
133 	Asynchronously send part of a raw message.
134 */
135 static int line6_send_raw_message_async_part(struct message *msg,
136 					     struct urb *urb)
137 {
138 	int retval;
139 	struct usb_line6 *line6 = msg->line6;
140 	int done = msg->done;
141 	int bytes = min(msg->size - done, line6->max_packet_size);
142 
143 	usb_fill_int_urb(urb, line6->usbdev,
144 		usb_sndintpipe(line6->usbdev, line6->properties->ep_ctrl_w),
145 		(char *)msg->buffer + done, bytes,
146 		line6_async_request_sent, msg, line6->interval);
147 
148 	msg->done += bytes;
149 	retval = usb_submit_urb(urb, GFP_ATOMIC);
150 
151 	if (retval < 0) {
152 		dev_err(line6->ifcdev, "%s: usb_submit_urb failed (%d)\n",
153 			__func__, retval);
154 		usb_free_urb(urb);
155 		kfree(msg);
156 		return retval;
157 	}
158 
159 	return 0;
160 }
161 
162 /*
163 	Setup and start timer.
164 */
165 void line6_start_timer(struct timer_list *timer, unsigned long msecs,
166 		       void (*function)(unsigned long), unsigned long data)
167 {
168 	setup_timer(timer, function, data);
169 	mod_timer(timer, jiffies + msecs_to_jiffies(msecs));
170 }
171 EXPORT_SYMBOL_GPL(line6_start_timer);
172 
173 /*
174 	Asynchronously send raw message.
175 */
176 int line6_send_raw_message_async(struct usb_line6 *line6, const char *buffer,
177 				 int size)
178 {
179 	struct message *msg;
180 	struct urb *urb;
181 
182 	/* create message: */
183 	msg = kmalloc(sizeof(struct message), GFP_ATOMIC);
184 	if (msg == NULL)
185 		return -ENOMEM;
186 
187 	/* create URB: */
188 	urb = usb_alloc_urb(0, GFP_ATOMIC);
189 
190 	if (urb == NULL) {
191 		kfree(msg);
192 		return -ENOMEM;
193 	}
194 
195 	/* set message data: */
196 	msg->line6 = line6;
197 	msg->buffer = buffer;
198 	msg->size = size;
199 	msg->done = 0;
200 
201 	/* start sending: */
202 	return line6_send_raw_message_async_part(msg, urb);
203 }
204 EXPORT_SYMBOL_GPL(line6_send_raw_message_async);
205 
206 /*
207 	Send asynchronous device version request.
208 */
209 int line6_version_request_async(struct usb_line6 *line6)
210 {
211 	char *buffer;
212 	int retval;
213 
214 	buffer = kmemdup(line6_request_version,
215 			sizeof(line6_request_version), GFP_ATOMIC);
216 	if (buffer == NULL)
217 		return -ENOMEM;
218 
219 	retval = line6_send_raw_message_async(line6, buffer,
220 					      sizeof(line6_request_version));
221 	kfree(buffer);
222 	return retval;
223 }
224 EXPORT_SYMBOL_GPL(line6_version_request_async);
225 
226 /*
227 	Send sysex message in pieces of wMaxPacketSize bytes.
228 */
229 int line6_send_sysex_message(struct usb_line6 *line6, const char *buffer,
230 			     int size)
231 {
232 	return line6_send_raw_message(line6, buffer,
233 				      size + SYSEX_EXTRA_SIZE) -
234 	    SYSEX_EXTRA_SIZE;
235 }
236 EXPORT_SYMBOL_GPL(line6_send_sysex_message);
237 
238 /*
239 	Allocate buffer for sysex message and prepare header.
240 	@param code sysex message code
241 	@param size number of bytes between code and sysex end
242 */
243 char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1, int code2,
244 			       int size)
245 {
246 	char *buffer = kmalloc(size + SYSEX_EXTRA_SIZE, GFP_ATOMIC);
247 
248 	if (!buffer)
249 		return NULL;
250 
251 	buffer[0] = LINE6_SYSEX_BEGIN;
252 	memcpy(buffer + 1, line6_midi_id, sizeof(line6_midi_id));
253 	buffer[sizeof(line6_midi_id) + 1] = code1;
254 	buffer[sizeof(line6_midi_id) + 2] = code2;
255 	buffer[sizeof(line6_midi_id) + 3 + size] = LINE6_SYSEX_END;
256 	return buffer;
257 }
258 EXPORT_SYMBOL_GPL(line6_alloc_sysex_buffer);
259 
260 /*
261 	Notification of data received from the Line 6 device.
262 */
263 static void line6_data_received(struct urb *urb)
264 {
265 	struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
266 	struct midi_buffer *mb = &line6->line6midi->midibuf_in;
267 	int done;
268 
269 	if (urb->status == -ESHUTDOWN)
270 		return;
271 
272 	done =
273 	    line6_midibuf_write(mb, urb->transfer_buffer, urb->actual_length);
274 
275 	if (done < urb->actual_length) {
276 		line6_midibuf_ignore(mb, done);
277 		dev_dbg(line6->ifcdev, "%d %d buffer overflow - message skipped\n",
278 			done, urb->actual_length);
279 	}
280 
281 	for (;;) {
282 		done =
283 		    line6_midibuf_read(mb, line6->buffer_message,
284 				       LINE6_MESSAGE_MAXLEN);
285 
286 		if (done == 0)
287 			break;
288 
289 		line6->message_length = done;
290 		line6_midi_receive(line6, line6->buffer_message, done);
291 
292 		if (line6->process_message)
293 			line6->process_message(line6);
294 	}
295 
296 	line6_start_listen(line6);
297 }
298 
299 /*
300 	Read data from device.
301 */
302 int line6_read_data(struct usb_line6 *line6, int address, void *data,
303 		    size_t datalen)
304 {
305 	struct usb_device *usbdev = line6->usbdev;
306 	int ret;
307 	unsigned char len;
308 
309 	/* query the serial number: */
310 	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
311 			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
312 			      (datalen << 8) | 0x21, address,
313 			      NULL, 0, LINE6_TIMEOUT * HZ);
314 
315 	if (ret < 0) {
316 		dev_err(line6->ifcdev, "read request failed (error %d)\n", ret);
317 		return ret;
318 	}
319 
320 	/* Wait for data length. We'll get 0xff until length arrives. */
321 	do {
322 		ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
323 				      USB_TYPE_VENDOR | USB_RECIP_DEVICE |
324 				      USB_DIR_IN,
325 				      0x0012, 0x0000, &len, 1,
326 				      LINE6_TIMEOUT * HZ);
327 		if (ret < 0) {
328 			dev_err(line6->ifcdev,
329 				"receive length failed (error %d)\n", ret);
330 			return ret;
331 		}
332 	} while (len == 0xff);
333 
334 	if (len != datalen) {
335 		/* should be equal or something went wrong */
336 		dev_err(line6->ifcdev,
337 			"length mismatch (expected %d, got %d)\n",
338 			(int)datalen, (int)len);
339 		return -EINVAL;
340 	}
341 
342 	/* receive the result: */
343 	ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
344 			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
345 			      0x0013, 0x0000, data, datalen,
346 			      LINE6_TIMEOUT * HZ);
347 
348 	if (ret < 0) {
349 		dev_err(line6->ifcdev, "read failed (error %d)\n", ret);
350 		return ret;
351 	}
352 
353 	return 0;
354 }
355 EXPORT_SYMBOL_GPL(line6_read_data);
356 
357 /*
358 	Write data to device.
359 */
360 int line6_write_data(struct usb_line6 *line6, int address, void *data,
361 		     size_t datalen)
362 {
363 	struct usb_device *usbdev = line6->usbdev;
364 	int ret;
365 	unsigned char status;
366 
367 	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
368 			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
369 			      0x0022, address, data, datalen,
370 			      LINE6_TIMEOUT * HZ);
371 
372 	if (ret < 0) {
373 		dev_err(line6->ifcdev,
374 			"write request failed (error %d)\n", ret);
375 		return ret;
376 	}
377 
378 	do {
379 		ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
380 				      0x67,
381 				      USB_TYPE_VENDOR | USB_RECIP_DEVICE |
382 				      USB_DIR_IN,
383 				      0x0012, 0x0000,
384 				      &status, 1, LINE6_TIMEOUT * HZ);
385 
386 		if (ret < 0) {
387 			dev_err(line6->ifcdev,
388 				"receiving status failed (error %d)\n", ret);
389 			return ret;
390 		}
391 	} while (status == 0xff);
392 
393 	if (status != 0) {
394 		dev_err(line6->ifcdev, "write failed (error %d)\n", ret);
395 		return -EINVAL;
396 	}
397 
398 	return 0;
399 }
400 EXPORT_SYMBOL_GPL(line6_write_data);
401 
402 /*
403 	Read Line 6 device serial number.
404 	(POD, TonePort, GuitarPort)
405 */
406 int line6_read_serial_number(struct usb_line6 *line6, int *serial_number)
407 {
408 	return line6_read_data(line6, 0x80d0, serial_number,
409 			       sizeof(*serial_number));
410 }
411 EXPORT_SYMBOL_GPL(line6_read_serial_number);
412 
413 /*
414 	Card destructor.
415 */
416 static void line6_destruct(struct snd_card *card)
417 {
418 	struct usb_line6 *line6 = card->private_data;
419 	struct usb_device *usbdev = line6->usbdev;
420 
421 	/* free buffer memory first: */
422 	kfree(line6->buffer_message);
423 	kfree(line6->buffer_listen);
424 
425 	/* then free URBs: */
426 	usb_free_urb(line6->urb_listen);
427 
428 	/* decrement reference counters: */
429 	usb_put_dev(usbdev);
430 }
431 
432 /* get data from endpoint descriptor (see usb_maxpacket): */
433 static void line6_get_interval(struct usb_line6 *line6)
434 {
435 	struct usb_device *usbdev = line6->usbdev;
436 	struct usb_host_endpoint *ep;
437 	unsigned pipe = usb_rcvintpipe(usbdev, line6->properties->ep_ctrl_r);
438 	unsigned epnum = usb_pipeendpoint(pipe);
439 
440 	ep = usbdev->ep_in[epnum];
441 	if (ep) {
442 		line6->interval = ep->desc.bInterval;
443 		line6->max_packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
444 	} else {
445 		dev_err(line6->ifcdev,
446 			"endpoint not available, using fallback values");
447 		line6->interval = LINE6_FALLBACK_INTERVAL;
448 		line6->max_packet_size = LINE6_FALLBACK_MAXPACKETSIZE;
449 	}
450 }
451 
452 static int line6_init_cap_control(struct usb_line6 *line6)
453 {
454 	int ret;
455 
456 	/* initialize USB buffers: */
457 	line6->buffer_listen = kmalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
458 	if (!line6->buffer_listen)
459 		return -ENOMEM;
460 
461 	line6->buffer_message = kmalloc(LINE6_MESSAGE_MAXLEN, GFP_KERNEL);
462 	if (!line6->buffer_message)
463 		return -ENOMEM;
464 
465 	line6->urb_listen = usb_alloc_urb(0, GFP_KERNEL);
466 	if (!line6->urb_listen)
467 		return -ENOMEM;
468 
469 	ret = line6_start_listen(line6);
470 	if (ret < 0) {
471 		dev_err(line6->ifcdev, "cannot start listening: %d\n", ret);
472 		return ret;
473 	}
474 
475 	return 0;
476 }
477 
478 /*
479 	Probe USB device.
480 */
481 int line6_probe(struct usb_interface *interface,
482 		const struct usb_device_id *id,
483 		const struct line6_properties *properties,
484 		int (*private_init)(struct usb_line6 *, const struct usb_device_id *id),
485 		size_t data_size)
486 {
487 	struct usb_device *usbdev = interface_to_usbdev(interface);
488 	struct snd_card *card;
489 	struct usb_line6 *line6;
490 	int interface_number;
491 	int ret;
492 
493 	if (WARN_ON(data_size < sizeof(*line6)))
494 		return -EINVAL;
495 
496 	/* we don't handle multiple configurations */
497 	if (usbdev->descriptor.bNumConfigurations != 1)
498 		return -ENODEV;
499 
500 	ret = snd_card_new(&interface->dev,
501 			   SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
502 			   THIS_MODULE, data_size, &card);
503 	if (ret < 0)
504 		return ret;
505 
506 	/* store basic data: */
507 	line6 = card->private_data;
508 	line6->card = card;
509 	line6->properties = properties;
510 	line6->usbdev = usbdev;
511 	line6->ifcdev = &interface->dev;
512 
513 	strcpy(card->id, properties->id);
514 	strcpy(card->driver, DRIVER_NAME);
515 	strcpy(card->shortname, properties->name);
516 	sprintf(card->longname, "Line 6 %s at USB %s", properties->name,
517 		dev_name(line6->ifcdev));
518 	card->private_free = line6_destruct;
519 
520 	usb_set_intfdata(interface, line6);
521 
522 	/* increment reference counters: */
523 	usb_get_dev(usbdev);
524 
525 	/* initialize device info: */
526 	dev_info(&interface->dev, "Line 6 %s found\n", properties->name);
527 
528 	/* query interface number */
529 	interface_number = interface->cur_altsetting->desc.bInterfaceNumber;
530 
531 	ret = usb_set_interface(usbdev, interface_number,
532 				properties->altsetting);
533 	if (ret < 0) {
534 		dev_err(&interface->dev, "set_interface failed\n");
535 		goto error;
536 	}
537 
538 	line6_get_interval(line6);
539 
540 	if (properties->capabilities & LINE6_CAP_CONTROL) {
541 		ret = line6_init_cap_control(line6);
542 		if (ret < 0)
543 			goto error;
544 	}
545 
546 	/* initialize device data based on device: */
547 	ret = private_init(line6, id);
548 	if (ret < 0)
549 		goto error;
550 
551 	/* creation of additional special files should go here */
552 
553 	dev_info(&interface->dev, "Line 6 %s now attached\n",
554 		 properties->name);
555 
556 	return 0;
557 
558  error:
559 	if (line6->disconnect)
560 		line6->disconnect(line6);
561 	snd_card_free(card);
562 	return ret;
563 }
564 EXPORT_SYMBOL_GPL(line6_probe);
565 
566 /*
567 	Line 6 device disconnected.
568 */
569 void line6_disconnect(struct usb_interface *interface)
570 {
571 	struct usb_line6 *line6 = usb_get_intfdata(interface);
572 	struct usb_device *usbdev = interface_to_usbdev(interface);
573 
574 	if (!line6)
575 		return;
576 
577 	if (WARN_ON(usbdev != line6->usbdev))
578 		return;
579 
580 	if (line6->urb_listen != NULL)
581 		line6_stop_listen(line6);
582 
583 	snd_card_disconnect(line6->card);
584 	if (line6->line6pcm)
585 		line6_pcm_disconnect(line6->line6pcm);
586 	if (line6->disconnect)
587 		line6->disconnect(line6);
588 
589 	dev_info(&interface->dev, "Line 6 %s now disconnected\n",
590 		 line6->properties->name);
591 
592 	/* make sure the device isn't destructed twice: */
593 	usb_set_intfdata(interface, NULL);
594 
595 	snd_card_free_when_closed(line6->card);
596 }
597 EXPORT_SYMBOL_GPL(line6_disconnect);
598 
599 #ifdef CONFIG_PM
600 
601 /*
602 	Suspend Line 6 device.
603 */
604 int line6_suspend(struct usb_interface *interface, pm_message_t message)
605 {
606 	struct usb_line6 *line6 = usb_get_intfdata(interface);
607 	struct snd_line6_pcm *line6pcm = line6->line6pcm;
608 
609 	snd_power_change_state(line6->card, SNDRV_CTL_POWER_D3hot);
610 
611 	if (line6->properties->capabilities & LINE6_CAP_CONTROL)
612 		line6_stop_listen(line6);
613 
614 	if (line6pcm != NULL) {
615 		snd_pcm_suspend_all(line6pcm->pcm);
616 		line6pcm->flags = 0;
617 	}
618 
619 	return 0;
620 }
621 EXPORT_SYMBOL_GPL(line6_suspend);
622 
623 /*
624 	Resume Line 6 device.
625 */
626 int line6_resume(struct usb_interface *interface)
627 {
628 	struct usb_line6 *line6 = usb_get_intfdata(interface);
629 
630 	if (line6->properties->capabilities & LINE6_CAP_CONTROL)
631 		line6_start_listen(line6);
632 
633 	snd_power_change_state(line6->card, SNDRV_CTL_POWER_D0);
634 	return 0;
635 }
636 EXPORT_SYMBOL_GPL(line6_resume);
637 
638 #endif /* CONFIG_PM */
639 
640 MODULE_AUTHOR(DRIVER_AUTHOR);
641 MODULE_DESCRIPTION(DRIVER_DESC);
642 MODULE_LICENSE("GPL");
643