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 usb_unlink_urb(u);
101 }
102 }
103 }
104 }
105
106 /*
107 Wait until unlinking of all currently active capture URBs has been
108 finished.
109 */
line6_wait_clear_audio_in_urbs(struct snd_line6_pcm * line6pcm)110 void line6_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
111 {
112 int timeout = HZ;
113 unsigned int i;
114 int alive;
115
116 do {
117 alive = 0;
118 for (i = LINE6_ISO_BUFFERS; i--;) {
119 if (test_bit(i, &line6pcm->active_urb_in))
120 alive++;
121 }
122 if (!alive)
123 break;
124 set_current_state(TASK_UNINTERRUPTIBLE);
125 schedule_timeout(1);
126 } while (--timeout > 0);
127 if (alive)
128 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
129 }
130
131 /*
132 Unlink all currently active capture URBs, and wait for finishing.
133 */
line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm * line6pcm)134 void line6_unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
135 {
136 line6_unlink_audio_in_urbs(line6pcm);
137 line6_wait_clear_audio_in_urbs(line6pcm);
138 }
139
140 /*
141 Copy data into ALSA capture buffer.
142 */
line6_capture_copy(struct snd_line6_pcm * line6pcm,char * fbuf,int fsize)143 void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
144 {
145 struct snd_pcm_substream *substream =
146 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
147 struct snd_pcm_runtime *runtime = substream->runtime;
148 const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
149 int frames = fsize / bytes_per_frame;
150
151 if (runtime == NULL)
152 return;
153
154 if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
155 /*
156 The transferred area goes over buffer boundary,
157 copy two separate chunks.
158 */
159 int len;
160 len = runtime->buffer_size - line6pcm->pos_in_done;
161
162 if (len > 0) {
163 memcpy(runtime->dma_area +
164 line6pcm->pos_in_done * bytes_per_frame, fbuf,
165 len * bytes_per_frame);
166 memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
167 (frames - len) * bytes_per_frame);
168 } else {
169 /* this is somewhat paranoid */
170 dev_err(line6pcm->line6->ifcdev,
171 "driver bug: len = %d\n", len);
172 }
173 } else {
174 /* copy single chunk */
175 memcpy(runtime->dma_area +
176 line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize);
177 }
178
179 line6pcm->pos_in_done += frames;
180 if (line6pcm->pos_in_done >= runtime->buffer_size)
181 line6pcm->pos_in_done -= runtime->buffer_size;
182 }
183
line6_capture_check_period(struct snd_line6_pcm * line6pcm,int length)184 void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
185 {
186 struct snd_pcm_substream *substream =
187 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
188
189 line6pcm->bytes_in += length;
190 if (line6pcm->bytes_in >= line6pcm->period_in) {
191 line6pcm->bytes_in %= line6pcm->period_in;
192 snd_pcm_period_elapsed(substream);
193 }
194 }
195
line6_free_capture_buffer(struct snd_line6_pcm * line6pcm)196 void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm)
197 {
198 kfree(line6pcm->buffer_in);
199 line6pcm->buffer_in = NULL;
200 }
201
202 /*
203 * Callback for completed capture URB.
204 */
audio_in_callback(struct urb * urb)205 static void audio_in_callback(struct urb *urb)
206 {
207 int i, index, length = 0, shutdown = 0;
208 unsigned long flags;
209
210 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
211
212 line6pcm->last_frame_in = urb->start_frame;
213
214 /* find index of URB */
215 for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
216 if (urb == line6pcm->urb_audio_in[index])
217 break;
218
219 #ifdef CONFIG_LINE6_USB_DUMP_PCM
220 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
221 struct usb_iso_packet_descriptor *fout =
222 &urb->iso_frame_desc[i];
223 line6_write_hexdump(line6pcm->line6, 'C',
224 urb->transfer_buffer + fout->offset,
225 fout->length);
226 }
227 #endif
228
229 spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
230
231 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
232 char *fbuf;
233 int fsize;
234 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
235
236 if (fin->status == -EXDEV) {
237 shutdown = 1;
238 break;
239 }
240
241 fbuf = urb->transfer_buffer + fin->offset;
242 fsize = fin->actual_length;
243
244 if (fsize > line6pcm->max_packet_size) {
245 dev_err(line6pcm->line6->ifcdev,
246 "driver and/or device bug: packet too large (%d > %d)\n",
247 fsize, line6pcm->max_packet_size);
248 }
249
250 length += fsize;
251
252 /* the following assumes LINE6_ISO_PACKETS == 1: */
253 line6pcm->prev_fbuf = fbuf;
254 line6pcm->prev_fsize = fsize;
255
256 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
257 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
258 #endif
259 if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM, &line6pcm->flags)
260 && (fsize > 0))
261 line6_capture_copy(line6pcm, fbuf, fsize);
262 }
263
264 clear_bit(index, &line6pcm->active_urb_in);
265
266 if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
267 shutdown = 1;
268
269 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
270
271 if (!shutdown) {
272 submit_audio_in_urb(line6pcm);
273
274 #ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
275 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
276 #endif
277 if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM, &line6pcm->flags))
278 line6_capture_check_period(line6pcm, length);
279 }
280 }
281
282 /* open capture callback */
snd_line6_capture_open(struct snd_pcm_substream * substream)283 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
284 {
285 int err;
286 struct snd_pcm_runtime *runtime = substream->runtime;
287 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
288
289 err = snd_pcm_hw_constraint_ratdens(runtime, 0,
290 SNDRV_PCM_HW_PARAM_RATE,
291 (&line6pcm->
292 properties->snd_line6_rates));
293 if (err < 0)
294 return err;
295
296 runtime->hw = line6pcm->properties->snd_line6_capture_hw;
297 return 0;
298 }
299
300 /* close capture callback */
snd_line6_capture_close(struct snd_pcm_substream * substream)301 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
302 {
303 return 0;
304 }
305
306 /* hw_params capture callback */
snd_line6_capture_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)307 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
308 struct snd_pcm_hw_params *hw_params)
309 {
310 int ret;
311 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
312
313 /* -- Florian Demski [FD] */
314 /* don't ask me why, but this fixes the bug on my machine */
315 if (line6pcm == NULL) {
316 if (substream->pcm == NULL)
317 return -ENOMEM;
318 if (substream->pcm->private_data == NULL)
319 return -ENOMEM;
320 substream->private_data = substream->pcm->private_data;
321 line6pcm = snd_pcm_substream_chip(substream);
322 }
323 /* -- [FD] end */
324
325 ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
326
327 if (ret < 0)
328 return ret;
329
330 ret = snd_pcm_lib_malloc_pages(substream,
331 params_buffer_bytes(hw_params));
332 if (ret < 0) {
333 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
334 return ret;
335 }
336
337 line6pcm->period_in = params_period_bytes(hw_params);
338 return 0;
339 }
340
341 /* hw_free capture callback */
snd_line6_capture_hw_free(struct snd_pcm_substream * substream)342 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
343 {
344 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
345 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
346 return snd_pcm_lib_free_pages(substream);
347 }
348
349 /* trigger callback */
snd_line6_capture_trigger(struct snd_line6_pcm * line6pcm,int cmd)350 int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
351 {
352 int err;
353
354 switch (cmd) {
355 case SNDRV_PCM_TRIGGER_START:
356 #ifdef CONFIG_PM
357 case SNDRV_PCM_TRIGGER_RESUME:
358 #endif
359 err = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
360
361 if (err < 0)
362 return err;
363
364 break;
365
366 case SNDRV_PCM_TRIGGER_STOP:
367 #ifdef CONFIG_PM
368 case SNDRV_PCM_TRIGGER_SUSPEND:
369 #endif
370 err = line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
371
372 if (err < 0)
373 return err;
374
375 break;
376
377 default:
378 return -EINVAL;
379 }
380
381 return 0;
382 }
383
384 /* capture pointer callback */
385 static snd_pcm_uframes_t
snd_line6_capture_pointer(struct snd_pcm_substream * substream)386 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
387 {
388 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
389 return line6pcm->pos_in_done;
390 }
391
392 /* capture operators */
393 struct snd_pcm_ops snd_line6_capture_ops = {
394 .open = snd_line6_capture_open,
395 .close = snd_line6_capture_close,
396 .ioctl = snd_pcm_lib_ioctl,
397 .hw_params = snd_line6_capture_hw_params,
398 .hw_free = snd_line6_capture_hw_free,
399 .prepare = snd_line6_prepare,
400 .trigger = snd_line6_trigger,
401 .pointer = snd_line6_capture_pointer,
402 };
403
line6_create_audio_in_urbs(struct snd_line6_pcm * line6pcm)404 int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
405 {
406 int i;
407
408 /* create audio URBs and fill in constant values: */
409 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
410 struct urb *urb;
411
412 /* URB for audio in: */
413 urb = line6pcm->urb_audio_in[i] =
414 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
415
416 if (urb == NULL) {
417 dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
418 return -ENOMEM;
419 }
420
421 urb->dev = line6pcm->line6->usbdev;
422 urb->pipe =
423 usb_rcvisocpipe(line6pcm->line6->usbdev,
424 line6pcm->ep_audio_read &
425 USB_ENDPOINT_NUMBER_MASK);
426 urb->transfer_flags = URB_ISO_ASAP;
427 urb->start_frame = -1;
428 urb->number_of_packets = LINE6_ISO_PACKETS;
429 urb->interval = LINE6_ISO_INTERVAL;
430 urb->error_count = 0;
431 urb->complete = audio_in_callback;
432 }
433
434 return 0;
435 }
436