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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*/
26static 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*/
76int 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*/
92void 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*/
110void 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*/
134void 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*/
143void 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
161 len = runtime->buffer_size - line6pcm->pos_in_done;
162
163 if (len > 0) {
164 memcpy(runtime->dma_area +
165 line6pcm->pos_in_done * bytes_per_frame, fbuf,
166 len * bytes_per_frame);
167 memcpy(runtime->dma_area, fbuf + len * bytes_per_frame,
168 (frames - len) * bytes_per_frame);
169 } else {
170 /* this is somewhat paranoid */
171 dev_err(line6pcm->line6->ifcdev,
172 "driver bug: len = %d\n", len);
173 }
174 } else {
175 /* copy single chunk */
176 memcpy(runtime->dma_area +
177 line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize);
178 }
179
180 line6pcm->pos_in_done += frames;
181 if (line6pcm->pos_in_done >= runtime->buffer_size)
182 line6pcm->pos_in_done -= runtime->buffer_size;
183}
184
185void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length)
186{
187 struct snd_pcm_substream *substream =
188 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
189
190 line6pcm->bytes_in += length;
191 if (line6pcm->bytes_in >= line6pcm->period_in) {
192 line6pcm->bytes_in %= line6pcm->period_in;
193 snd_pcm_period_elapsed(substream);
194 }
195}
196
197void line6_free_capture_buffer(struct snd_line6_pcm *line6pcm)
198{
199 kfree(line6pcm->buffer_in);
200 line6pcm->buffer_in = NULL;
201}
202
203/*
204 * Callback for completed capture URB.
205 */
206static void audio_in_callback(struct urb *urb)
207{
208 int i, index, length = 0, shutdown = 0;
209 unsigned long flags;
210
211 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
212
213 line6pcm->last_frame_in = urb->start_frame;
214
215 /* find index of URB */
216 for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
217 if (urb == line6pcm->urb_audio_in[index])
218 break;
219
220 spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
221
222 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
223 char *fbuf;
224 int fsize;
225 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
226
227 if (fin->status == -EXDEV) {
228 shutdown = 1;
229 break;
230 }
231
232 fbuf = urb->transfer_buffer + fin->offset;
233 fsize = fin->actual_length;
234
235 if (fsize > line6pcm->max_packet_size) {
236 dev_err(line6pcm->line6->ifcdev,
237 "driver and/or device bug: packet too large (%d > %d)\n",
238 fsize, line6pcm->max_packet_size);
239 }
240
241 length += fsize;
242
243 /* the following assumes LINE6_ISO_PACKETS == 1: */
244 line6pcm->prev_fbuf = fbuf;
245 line6pcm->prev_fsize = fsize;
246
247#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
248 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
249#endif
250 if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
251 &line6pcm->flags) && (fsize > 0))
252 line6_capture_copy(line6pcm, fbuf, fsize);
253 }
254
255 clear_bit(index, &line6pcm->active_urb_in);
256
257 if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
258 shutdown = 1;
259
260 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
261
262 if (!shutdown) {
263 submit_audio_in_urb(line6pcm);
264
265#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
266 if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
267#endif
268 if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
269 &line6pcm->flags))
270 line6_capture_check_period(line6pcm, length);
271 }
272}
273
274/* open capture callback */
275static int snd_line6_capture_open(struct snd_pcm_substream *substream)
276{
277 int err;
278 struct snd_pcm_runtime *runtime = substream->runtime;
279 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
280
281 err = snd_pcm_hw_constraint_ratdens(runtime, 0,
282 SNDRV_PCM_HW_PARAM_RATE,
283 (&line6pcm->
284 properties->snd_line6_rates));
285 if (err < 0)
286 return err;
287
288 runtime->hw = line6pcm->properties->snd_line6_capture_hw;
289 return 0;
290}
291
292/* close capture callback */
293static int snd_line6_capture_close(struct snd_pcm_substream *substream)
294{
295 return 0;
296}
297
298/* hw_params capture callback */
299static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
300 struct snd_pcm_hw_params *hw_params)
301{
302 int ret;
303 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
304
305 /* -- Florian Demski [FD] */
306 /* don't ask me why, but this fixes the bug on my machine */
307 if (line6pcm == NULL) {
308 if (substream->pcm == NULL)
309 return -ENOMEM;
310 if (substream->pcm->private_data == NULL)
311 return -ENOMEM;
312 substream->private_data = substream->pcm->private_data;
313 line6pcm = snd_pcm_substream_chip(substream);
314 }
315 /* -- [FD] end */
316
317 ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
318
319 if (ret < 0)
320 return ret;
321
322 ret = snd_pcm_lib_malloc_pages(substream,
323 params_buffer_bytes(hw_params));
324 if (ret < 0) {
325 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
326 return ret;
327 }
328
329 line6pcm->period_in = params_period_bytes(hw_params);
330 return 0;
331}
332
333/* hw_free capture callback */
334static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
335{
336 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
337 line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
338 return snd_pcm_lib_free_pages(substream);
339}
340
341/* trigger callback */
342int snd_line6_capture_trigger(struct snd_line6_pcm *line6pcm, int cmd)
343{
344 int err;
345
346 switch (cmd) {
347 case SNDRV_PCM_TRIGGER_START:
348#ifdef CONFIG_PM
349 case SNDRV_PCM_TRIGGER_RESUME:
350#endif
351 err = line6_pcm_acquire(line6pcm,
352 LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
353
354 if (err < 0)
355 return err;
356
357 break;
358
359 case SNDRV_PCM_TRIGGER_STOP:
360#ifdef CONFIG_PM
361 case SNDRV_PCM_TRIGGER_SUSPEND:
362#endif
363 err = line6_pcm_release(line6pcm,
364 LINE6_BIT_PCM_ALSA_CAPTURE_STREAM);
365
366 if (err < 0)
367 return err;
368
369 break;
370
371 default:
372 return -EINVAL;
373 }
374
375 return 0;
376}
377
378/* capture pointer callback */
379static snd_pcm_uframes_t
380snd_line6_capture_pointer(struct snd_pcm_substream *substream)
381{
382 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
383 return line6pcm->pos_in_done;
384}
385
386/* capture operators */
387struct snd_pcm_ops snd_line6_capture_ops = {
388 .open = snd_line6_capture_open,
389 .close = snd_line6_capture_close,
390 .ioctl = snd_pcm_lib_ioctl,
391 .hw_params = snd_line6_capture_hw_params,
392 .hw_free = snd_line6_capture_hw_free,
393 .prepare = snd_line6_prepare,
394 .trigger = snd_line6_trigger,
395 .pointer = snd_line6_capture_pointer,
396};
397
398int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
399{
400 int i;
401
402 /* create audio URBs and fill in constant values: */
403 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
404 struct urb *urb;
405
406 /* URB for audio in: */
407 urb = line6pcm->urb_audio_in[i] =
408 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
409
410 if (urb == NULL) {
411 dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
412 return -ENOMEM;
413 }
414
415 urb->dev = line6pcm->line6->usbdev;
416 urb->pipe =
417 usb_rcvisocpipe(line6pcm->line6->usbdev,
418 line6pcm->ep_audio_read &
419 USB_ENDPOINT_NUMBER_MASK);
420 urb->transfer_flags = URB_ISO_ASAP;
421 urb->start_frame = -1;
422 urb->number_of_packets = LINE6_ISO_PACKETS;
423 urb->interval = LINE6_ISO_INTERVAL;
424 urb->error_count = 0;
425 urb->complete = audio_in_callback;
426 }
427
428 return 0;
429}