tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Line6 Linux USB driver - 0.9.1beta
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/slab.h>
13#include <linux/usb.h>
14#include <sound/core.h>
15#include <sound/rawmidi.h>
16
17#include "audio.h"
18#include "driver.h"
19#include "midi.h"
20#include "pod.h"
21#include "usbdefs.h"
22
23#define line6_rawmidi_substream_midi(substream) \
24 ((struct snd_line6_midi *)((substream)->rmidi->private_data))
25
26static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
27 int length);
28
29/*
30 Pass data received via USB to MIDI.
31*/
32void line6_midi_receive(struct usb_line6 *line6, unsigned char *data,
33 int length)
34{
35 if (line6->line6midi->substream_receive)
36 snd_rawmidi_receive(line6->line6midi->substream_receive,
37 data, length);
38}
39
40/*
41 Read data from MIDI buffer and transmit them via USB.
42*/
43static void line6_midi_transmit(struct snd_rawmidi_substream *substream)
44{
45 struct usb_line6 *line6 =
46 line6_rawmidi_substream_midi(substream)->line6;
47 struct snd_line6_midi *line6midi = line6->line6midi;
48 struct MidiBuffer *mb = &line6midi->midibuf_out;
49 unsigned long flags;
50 unsigned char chunk[line6->max_packet_size];
51 int req, done;
52
53 spin_lock_irqsave(&line6->line6midi->midi_transmit_lock, flags);
54
55 for (;;) {
56 req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size);
57 done = snd_rawmidi_transmit_peek(substream, chunk, req);
58
59 if (done == 0)
60 break;
61
62#ifdef CONFIG_LINE6_USB_DUMP_MIDI
63 line6_write_hexdump(line6, 's', chunk, done);
64#endif
65 line6_midibuf_write(mb, chunk, done);
66 snd_rawmidi_transmit_ack(substream, done);
67 }
68
69 for (;;) {
70 done = line6_midibuf_read(mb, chunk, line6->max_packet_size);
71
72 if (done == 0)
73 break;
74
75 if (line6_midibuf_skip_message
76 (mb, line6midi->midi_mask_transmit))
77 continue;
78
79 send_midi_async(line6, chunk, done);
80 }
81
82 spin_unlock_irqrestore(&line6->line6midi->midi_transmit_lock, flags);
83}
84
85/*
86 Notification of completion of MIDI transmission.
87*/
88static void midi_sent(struct urb *urb)
89{
90 unsigned long flags;
91 int status;
92 int num;
93 struct usb_line6 *line6 = (struct usb_line6 *)urb->context;
94
95 status = urb->status;
96 kfree(urb->transfer_buffer);
97 usb_free_urb(urb);
98
99 if (status == -ESHUTDOWN)
100 return;
101
102 spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
103 num = --line6->line6midi->num_active_send_urbs;
104
105 if (num == 0) {
106 line6_midi_transmit(line6->line6midi->substream_transmit);
107 num = line6->line6midi->num_active_send_urbs;
108 }
109
110 if (num == 0)
111 wake_up(&line6->line6midi->send_wait);
112
113 spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
114}
115
116/*
117 Send an asynchronous MIDI message.
118 Assumes that line6->line6midi->send_urb_lock is held
119 (i.e., this function is serialized).
120*/
121static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
122 int length)
123{
124 struct urb *urb;
125 int retval;
126 unsigned char *transfer_buffer;
127
128 urb = usb_alloc_urb(0, GFP_ATOMIC);
129
130 if (urb == NULL) {
131 dev_err(line6->ifcdev, "Out of memory\n");
132 return -ENOMEM;
133 }
134#ifdef CONFIG_LINE6_USB_DUMP_CTRL
135 line6_write_hexdump(line6, 'S', data, length);
136#endif
137
138 transfer_buffer = kmemdup(data, length, GFP_ATOMIC);
139
140 if (transfer_buffer == NULL) {
141 usb_free_urb(urb);
142 dev_err(line6->ifcdev, "Out of memory\n");
143 return -ENOMEM;
144 }
145
146 usb_fill_int_urb(urb, line6->usbdev,
147 usb_sndbulkpipe(line6->usbdev,
148 line6->ep_control_write),
149 transfer_buffer, length, midi_sent, line6,
150 line6->interval);
151 urb->actual_length = 0;
152 retval = usb_submit_urb(urb, GFP_ATOMIC);
153
154 if (retval < 0) {
155 dev_err(line6->ifcdev, "usb_submit_urb failed\n");
156 usb_free_urb(urb);
157 return -EINVAL;
158 }
159
160 ++line6->line6midi->num_active_send_urbs;
161
162 switch (line6->usbdev->descriptor.idProduct) {
163 case LINE6_DEVID_BASSPODXT:
164 case LINE6_DEVID_BASSPODXTLIVE:
165 case LINE6_DEVID_BASSPODXTPRO:
166 case LINE6_DEVID_PODXT:
167 case LINE6_DEVID_PODXTLIVE:
168 case LINE6_DEVID_PODXTPRO:
169 case LINE6_DEVID_POCKETPOD:
170 line6_pod_midi_postprocess((struct usb_line6_pod *)line6, data,
171 length);
172 break;
173
174 case LINE6_DEVID_VARIAX:
175 case LINE6_DEVID_PODHD300:
176 case LINE6_DEVID_PODHD500:
177 break;
178
179 default:
180 MISSING_CASE;
181 }
182
183 return 0;
184}
185
186static int line6_midi_output_open(struct snd_rawmidi_substream *substream)
187{
188 return 0;
189}
190
191static int line6_midi_output_close(struct snd_rawmidi_substream *substream)
192{
193 return 0;
194}
195
196static void line6_midi_output_trigger(struct snd_rawmidi_substream *substream,
197 int up)
198{
199 unsigned long flags;
200 struct usb_line6 *line6 =
201 line6_rawmidi_substream_midi(substream)->line6;
202
203 line6->line6midi->substream_transmit = substream;
204 spin_lock_irqsave(&line6->line6midi->send_urb_lock, flags);
205
206 if (line6->line6midi->num_active_send_urbs == 0)
207 line6_midi_transmit(substream);
208
209 spin_unlock_irqrestore(&line6->line6midi->send_urb_lock, flags);
210}
211
212static void line6_midi_output_drain(struct snd_rawmidi_substream *substream)
213{
214 struct usb_line6 *line6 =
215 line6_rawmidi_substream_midi(substream)->line6;
216 struct snd_line6_midi *midi = line6->line6midi;
217 wait_event_interruptible(midi->send_wait,
218 midi->num_active_send_urbs == 0);
219}
220
221static int line6_midi_input_open(struct snd_rawmidi_substream *substream)
222{
223 return 0;
224}
225
226static int line6_midi_input_close(struct snd_rawmidi_substream *substream)
227{
228 return 0;
229}
230
231static void line6_midi_input_trigger(struct snd_rawmidi_substream *substream,
232 int up)
233{
234 struct usb_line6 *line6 =
235 line6_rawmidi_substream_midi(substream)->line6;
236
237 if (up)
238 line6->line6midi->substream_receive = substream;
239 else
240 line6->line6midi->substream_receive = 0;
241}
242
243static struct snd_rawmidi_ops line6_midi_output_ops = {
244 .open = line6_midi_output_open,
245 .close = line6_midi_output_close,
246 .trigger = line6_midi_output_trigger,
247 .drain = line6_midi_output_drain,
248};
249
250static struct snd_rawmidi_ops line6_midi_input_ops = {
251 .open = line6_midi_input_open,
252 .close = line6_midi_input_close,
253 .trigger = line6_midi_input_trigger,
254};
255
256/*
257 Cleanup the Line6 MIDI device.
258*/
259static void line6_cleanup_midi(struct snd_rawmidi *rmidi)
260{
261}
262
263/* Create a MIDI device */
264static int snd_line6_new_midi(struct snd_line6_midi *line6midi)
265{
266 struct snd_rawmidi *rmidi;
267 int err;
268
269 err = snd_rawmidi_new(line6midi->line6->card, "Line6 MIDI", 0, 1, 1,
270 &rmidi);
271 if (err < 0)
272 return err;
273
274 rmidi->private_data = line6midi;
275 rmidi->private_free = line6_cleanup_midi;
276 strcpy(rmidi->id, line6midi->line6->properties->id);
277 strcpy(rmidi->name, line6midi->line6->properties->name);
278
279 rmidi->info_flags =
280 SNDRV_RAWMIDI_INFO_OUTPUT |
281 SNDRV_RAWMIDI_INFO_INPUT | SNDRV_RAWMIDI_INFO_DUPLEX;
282
283 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
284 &line6_midi_output_ops);
285 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
286 &line6_midi_input_ops);
287 return 0;
288}
289
290/*
291 "read" request on "midi_mask_transmit" special file.
292*/
293static ssize_t midi_get_midi_mask_transmit(struct device *dev,
294 struct device_attribute *attr,
295 char *buf)
296{
297 struct usb_interface *interface = to_usb_interface(dev);
298 struct usb_line6 *line6 = usb_get_intfdata(interface);
299 return sprintf(buf, "%d\n", line6->line6midi->midi_mask_transmit);
300}
301
302/*
303 "write" request on "midi_mask" special file.
304*/
305static ssize_t midi_set_midi_mask_transmit(struct device *dev,
306 struct device_attribute *attr,
307 const char *buf, size_t count)
308{
309 struct usb_interface *interface = to_usb_interface(dev);
310 struct usb_line6 *line6 = usb_get_intfdata(interface);
311 unsigned short value;
312 int ret;
313
314 ret = kstrtou16(buf, 10, &value);
315 if (ret)
316 return ret;
317
318 line6->line6midi->midi_mask_transmit = value;
319 return count;
320}
321
322/*
323 "read" request on "midi_mask_receive" special file.
324*/
325static ssize_t midi_get_midi_mask_receive(struct device *dev,
326 struct device_attribute *attr,
327 char *buf)
328{
329 struct usb_interface *interface = to_usb_interface(dev);
330 struct usb_line6 *line6 = usb_get_intfdata(interface);
331 return sprintf(buf, "%d\n", line6->line6midi->midi_mask_receive);
332}
333
334/*
335 "write" request on "midi_mask" special file.
336*/
337static ssize_t midi_set_midi_mask_receive(struct device *dev,
338 struct device_attribute *attr,
339 const char *buf, size_t count)
340{
341 struct usb_interface *interface = to_usb_interface(dev);
342 struct usb_line6 *line6 = usb_get_intfdata(interface);
343 unsigned short value;
344 int ret;
345
346 ret = kstrtou16(buf, 10, &value);
347 if (ret)
348 return ret;
349
350 line6->line6midi->midi_mask_receive = value;
351 return count;
352}
353
354static DEVICE_ATTR(midi_mask_transmit, S_IWUSR | S_IRUGO,
355 midi_get_midi_mask_transmit, midi_set_midi_mask_transmit);
356static DEVICE_ATTR(midi_mask_receive, S_IWUSR | S_IRUGO,
357 midi_get_midi_mask_receive, midi_set_midi_mask_receive);
358
359/* MIDI device destructor */
360static int snd_line6_midi_free(struct snd_device *device)
361{
362 struct snd_line6_midi *line6midi = device->device_data;
363 device_remove_file(line6midi->line6->ifcdev,
364 &dev_attr_midi_mask_transmit);
365 device_remove_file(line6midi->line6->ifcdev,
366 &dev_attr_midi_mask_receive);
367 line6_midibuf_destroy(&line6midi->midibuf_in);
368 line6_midibuf_destroy(&line6midi->midibuf_out);
369 return 0;
370}
371
372/*
373 Initialize the Line6 MIDI subsystem.
374*/
375int line6_init_midi(struct usb_line6 *line6)
376{
377 static struct snd_device_ops midi_ops = {
378 .dev_free = snd_line6_midi_free,
379 };
380
381 int err;
382 struct snd_line6_midi *line6midi;
383
384 if (!(line6->properties->capabilities & LINE6_BIT_CONTROL)) {
385 /* skip MIDI initialization and report success */
386 return 0;
387 }
388
389 line6midi = kzalloc(sizeof(struct snd_line6_midi), GFP_KERNEL);
390
391 if (line6midi == NULL)
392 return -ENOMEM;
393
394 err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
395 if (err < 0) {
396 kfree(line6midi);
397 return err;
398 }
399
400 err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
401 if (err < 0) {
402 kfree(line6midi->midibuf_in.buf);
403 kfree(line6midi);
404 return err;
405 }
406
407 line6midi->line6 = line6;
408
409 switch (line6->product) {
410 case LINE6_DEVID_PODHD300:
411 case LINE6_DEVID_PODHD500:
412 line6midi->midi_mask_transmit = 1;
413 line6midi->midi_mask_receive = 1;
414 break;
415
416 default:
417 line6midi->midi_mask_transmit = 1;
418 line6midi->midi_mask_receive = 4;
419 }
420
421 line6->line6midi = line6midi;
422
423 err = snd_device_new(line6->card, SNDRV_DEV_RAWMIDI, line6midi,
424 &midi_ops);
425 if (err < 0)
426 return err;
427
428 snd_card_set_dev(line6->card, line6->ifcdev);
429
430 err = snd_line6_new_midi(line6midi);
431 if (err < 0)
432 return err;
433
434 err = device_create_file(line6->ifcdev, &dev_attr_midi_mask_transmit);
435 if (err < 0)
436 return err;
437
438 err = device_create_file(line6->ifcdev, &dev_attr_midi_mask_receive);
439 if (err < 0)
440 return err;
441
442 init_waitqueue_head(&line6midi->send_wait);
443 spin_lock_init(&line6midi->send_urb_lock);
444 spin_lock_init(&line6midi->midi_transmit_lock);
445 return 0;
446}