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 <sound/core.h>
14 #include <sound/pcm.h>
15 #include <sound/pcm_params.h>
16
17 #include "audio.h"
18 #include "capture.h"
19 #include "driver.h"
20 #include "pcm.h"
21 #include "pod.h"
22
23 /*
24 Find a free URB and submit it.
25 */
submit_audio_in_urb(struct snd_line6_pcm * line6pcm)26 static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm)
27 {
28 int index;
29 unsigned long flags;
30 int i, urb_size;
31 int ret;
32 struct urb *urb_in;
33
34 spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
35 index =
36 find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
37
38 if (index < 0 || index >= LINE6_ISO_BUFFERS) {
39 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
40 dev_err(line6pcm->line6->ifcdev, "no free URB found\n");
41 return -EINVAL;
42 }
43
44 urb_in = line6pcm->urb_audio_in[index];
45 urb_size = 0;
46
47 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
48 struct usb_iso_packet_descriptor *fin =
49 &urb_in->iso_frame_desc[i];
50 fin->offset = urb_size;
51 fin->length = line6pcm->max_packet_size;
52 urb_size += line6pcm->max_packet_size;
53 }
54
55 urb_in->transfer_buffer =
56 line6pcm->buffer_in +
57 index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
58 urb_in->transfer_buffer_length = urb_size;
59 urb_in->context = line6pcm;
60
61 ret = usb_submit_urb(urb_in, GFP_ATOMIC);
62
63 if (ret == 0)
64 set_bit(index, &line6pcm->active_urb_in);
65 else
66 dev_err(line6pcm->line6->ifcdev,
67 "URB in #%d submission failed (%d)\n", index, ret);
68
69 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
70 return 0;
71 }
72
73 /*
74 Submit all currently available capture URBs.
75 */
line6_submit_audio_in_all_urbs(struct snd_line6_pcm * line6pcm)76 int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm)
77 {
78 int ret, i;
79
80 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
81 ret = submit_audio_in_urb(line6pcm);
82 if (ret < 0)
83 return ret;
84 }
85
86 return 0;
87 }
88
89 /*
90 Unlink all currently active capture URBs.
91 */
line6_unlink_audio_in_urbs(struct snd_line6_pcm * line6pcm)92 void line6_unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
93 {
94 unsigned int i;
95
96 for (i = LINE6_ISO_BUFFERS; i--;) {
97 if (test_bit(i, &line6pcm->active_urb_in)) {
98 if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
99 struct urb *u = line6pcm->urb_audio_in[i];
100
101 usb_unlink_urb(u);
102 }
103 }
104 }
105 }
106
107 /*
108 Wait until unlinking of all currently active capture URBs has been
109 finished.
110 */
line6_wait_clear_audio_in_urbs(struct snd_line6_pcm * line6pcm)111 void line6_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
112 {
113 int timeout = HZ;
114 unsigned int i;
115 int alive;
116
117 do {
118 alive = 0;
119 for (i = LINE6_ISO_BUFFERS; i--;) {
120 if (test_bit(i, &line6pcm->active_urb_in))
121 alive++;
122 }
123 if (!alive)
124 break;
125 set_current_state(TASK_UNINTERRUPTIBLE);
126 schedule_timeout(1);
127 } while (--timeout > 0);
128 if (alive)
129 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
130 }
131
132 /*
133 Unlink all currently active capture URBs, and wait for finishing.
134 */
line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm * line6pcm)135 void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
136 {
137 line6_unlink_audio_in_urbs(line6pcm);
138 line6_wait_clear_audio_in_urbs(line6pcm);
139 }
140
141 /*
142 Copy data into ALSA capture buffer.
143 */
line6_capture_copy(struct snd_line6_pcm * line6pcm,char * fbuf,int fsize)144 void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
145 {
146 struct snd_pcm_substream *substream =
147 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
148 struct snd_pcm_runtime *runtime = substream->runtime;
149 const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
150 int frames = fsize / bytes_per_frame;
151
152 if (runtime == NULL)
153 return;
154
155 if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
156 /*
157 The transferred area goes over buffer boundary,
158 copy two separate chunks.
159 */
160 int len;
161
162 len = runtime->buffer_size - line6pcm->pos_in_done;
163
164 if (len > 0) {
165 memcpy(runtime->dma_area +
166 line6pcm->pos_in_done * bytes_per_frame, fbuf,
167 len * bytes_per_frame);
168 memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
169 (frames - len) * bytes_per_frame);
170 } else {
171 /* this is somewhat paranoid */
172 dev_err(line6pcm->line6->ifcdev,
173 "driver bug: len = %d\n", len);
174 }
175 } else {
176 /* copy single chunk */
177 memcpy(runtime->dma_area +
178 line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize);
179 }
180
181 line6pcm->pos_in_done += frames;
182 if (line6pcm->pos_in_done >= runtime->buffer_size)
183 line6pcm->pos_in_done -= runtime->buffer_size;
184 }
185
line6_capture_check_period(struct snd_line6_pcm * line6pcm,int length)186 void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
187 {
188 struct snd_pcm_substream *substream =
189 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
190
191 line6pcm->bytes_in += length;
192 if (line6pcm->bytes_in >= line6pcm->period_in) {
193 line6pcm->bytes_in %= line6pcm->period_in;
194 snd_pcm_period_elapsed(substream);
195 }
196 }
197
line6_free_capture_buffer(struct snd_line6_pcm * line6pcm)198 void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm)
199 {
200 kfree(line6pcm->buffer_in);
201 line6pcm->buffer_in = NULL;
202 }
203
204 /*
205 * Callback for completed capture URB.
206 */
audio_in_callback(struct urb * urb)207 static void audio_in_callback(struct urb *urb)
208 {
209 int i, index, length = 0, shutdown = 0;
210 unsigned long flags;
211
212 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
213
214 line6pcm->last_frame_in = urb->start_frame;
215
216 /* find index of URB */
217 for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
218 if (urb == line6pcm->urb_audio_in[index])
219 break;
220
221 spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
222
223 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
224 char *fbuf;
225 int fsize;
226 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
227
228 if (fin->status == -EXDEV) {
229 shutdown = 1;
230 break;
231 }
232
233 fbuf = urb->transfer_buffer + fin->offset;
234 fsize = fin->actual_length;
235
236 if (fsize > line6pcm->max_packet_size) {
237 dev_err(line6pcm->line6->ifcdev,
238 "driver and/or device bug: packet too large (%d > %d)\n",
239 fsize, line6pcm->max_packet_size);
240 }
241
242 length += fsize;
243
244 /* the following assumes LINE6_ISO_PACKETS == 1: */
245 line6pcm->prev_fbuf = fbuf;
246 line6pcm->prev_fsize = fsize;
247
248 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
249 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
250 #endif
251 if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
252 &line6pcm->flags) && (fsize > 0))
253 line6_capture_copy(line6pcm, fbuf, fsize);
254 }
255
256 clear_bit(index, &line6pcm->active_urb_in);
257
258 if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
259 shutdown = 1;
260
261 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
262
263 if (!shutdown) {
264 submit_audio_in_urb(line6pcm);
265
266 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
267 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
268 #endif
269 if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
270 &line6pcm->flags))
271 line6_capture_check_period(line6pcm, length);
272 }
273 }
274
275 /* open capture callback */
snd_line6_capture_open(struct snd_pcm_substream * substream)276 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
277 {
278 int err;
279 struct snd_pcm_runtime *runtime = substream->runtime;
280 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
281
282 err = snd_pcm_hw_constraint_ratdens(runtime, 0,
283 SNDRV_PCM_HW_PARAM_RATE,
284 (&line6pcm->
285 properties->snd_line6_rates));
286 if (err < 0)
287 return err;
288
289 runtime->hw = line6pcm->properties->snd_line6_capture_hw;
290 return 0;
291 }
292
293 /* close capture callback */
snd_line6_capture_close(struct snd_pcm_substream * substream)294 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
295 {
296 return 0;
297 }
298
299 /* hw_params capture callback */
snd_line6_capture_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)300 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
301 struct snd_pcm_hw_params *hw_params)
302 {
303 int ret;
304 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
305
306 /* -- Florian Demski [FD] */
307 /* don't ask me why, but this fixes the bug on my machine */
308 if (line6pcm == NULL) {
309 if (substream->pcm == NULL)
310 return -ENOMEM;
311 if (substream->pcm->private_data == NULL)
312 return -ENOMEM;
313 substream->private_data = substream->pcm->private_data;
314 line6pcm = snd_pcm_substream_chip(substream);
315 }
316 /* -- [FD] end */
317
318 ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
319
320 if (ret < 0)
321 return ret;
322
323 ret = snd_pcm_lib_malloc_pages(substream,
324 params_buffer_bytes(hw_params));
325 if (ret < 0) {
326 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
327 return ret;
328 }
329
330 line6pcm->period_in = params_period_bytes(hw_params);
331 return 0;
332 }
333
334 /* hw_free capture callback */
snd_line6_capture_hw_free(struct snd_pcm_substream * substream)335 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
336 {
337 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
338
339 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
340 return snd_pcm_lib_free_pages(substream);
341 }
342
343 /* trigger callback */
snd_line6_capture_trigger(struct snd_line6_pcm * line6pcm,int cmd)344 int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
345 {
346 int err;
347
348 switch (cmd) {
349 case SNDRV_PCM_TRIGGER_START:
350 #ifdef CONFIG_PM
351 case SNDRV_PCM_TRIGGER_RESUME:
352 #endif
353 err = line6_pcm_acquire(line6pcm,
354 LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
355
356 if (err < 0)
357 return err;
358
359 break;
360
361 case SNDRV_PCM_TRIGGER_STOP:
362 #ifdef CONFIG_PM
363 case SNDRV_PCM_TRIGGER_SUSPEND:
364 #endif
365 err = line6_pcm_release(line6pcm,
366 LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
367
368 if (err < 0)
369 return err;
370
371 break;
372
373 default:
374 return -EINVAL;
375 }
376
377 return 0;
378 }
379
380 /* capture pointer callback */
381 static snd_pcm_uframes_t
snd_line6_capture_pointer(struct snd_pcm_substream * substream)382 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
383 {
384 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
385
386 return line6pcm->pos_in_done;
387 }
388
389 /* capture operators */
390 struct snd_pcm_ops snd_line6_capture_ops = {
391 .open = snd_line6_capture_open,
392 .close = snd_line6_capture_close,
393 .ioctl = snd_pcm_lib_ioctl,
394 .hw_params = snd_line6_capture_hw_params,
395 .hw_free = snd_line6_capture_hw_free,
396 .prepare = snd_line6_prepare,
397 .trigger = snd_line6_trigger,
398 .pointer = snd_line6_capture_pointer,
399 };
400
line6_create_audio_in_urbs(struct snd_line6_pcm * line6pcm)401 int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
402 {
403 int i;
404
405 /* create audio URBs and fill in constant values: */
406 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
407 struct urb *urb;
408
409 /* URB for audio in: */
410 urb = line6pcm->urb_audio_in[i] =
411 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
412
413 if (urb == NULL) {
414 dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
415 return -ENOMEM;
416 }
417
418 urb->dev = line6pcm->line6->usbdev;
419 urb->pipe =
420 usb_rcvisocpipe(line6pcm->line6->usbdev,
421 line6pcm->ep_audio_read &
422 USB_ENDPOINT_NUMBER_MASK);
423 urb->transfer_flags = URB_ISO_ASAP;
424 urb->start_frame = -1;
425 urb->number_of_packets = LINE6_ISO_PACKETS;
426 urb->interval = LINE6_ISO_INTERVAL;
427 urb->error_count = 0;
428 urb->complete = audio_in_callback;
429 }
430
431 return 0;
432 }
433