1 /*
2 * Line6 Linux USB driver - 0.8.0
3 *
4 * Copyright (C) 2004-2009 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 "driver.h"
13
14 #include <sound/core.h>
15 #include <sound/pcm.h>
16 #include <sound/pcm_params.h>
17
18 #include "audio.h"
19 #include "pcm.h"
20 #include "pod.h"
21 #include "capture.h"
22
23
24 /*
25 Find a free URB and submit it.
26 */
27 static int submit_audio_in_urb(struct snd_pcm_substream *substream)
28 {
29 int index;
30 unsigned long flags;
31 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
32 int i, urb_size;
33 struct urb *urb_in;
34
35 spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
36 index = 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(s2m(substream), "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 = &urb_in->iso_frame_desc[i];
49 fin->offset = urb_size;
50 fin->length = line6pcm->max_packet_size;
51 urb_size += line6pcm->max_packet_size;
52 }
53
54 urb_in->transfer_buffer = line6pcm->buffer_in + index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
55 urb_in->transfer_buffer_length = urb_size;
56 urb_in->context = substream;
57
58 if (usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
59 set_bit(index, &line6pcm->active_urb_in);
60 else
61 dev_err(s2m(substream), "URB in #%d submission failed\n", index);
62
63 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
64 return 0;
65 }
66
67 /*
68 Submit all currently available capture URBs.
69 */
70 static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
71 {
72 int ret, i;
73
74 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
75 ret = submit_audio_in_urb(substream);
76 if (ret < 0)
77 return ret;
78 }
79
80 return 0;
81 }
82
83 /*
84 Unlink all currently active capture URBs.
85 */
86 static void unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
87 {
88 unsigned int i;
89
90 for (i = LINE6_ISO_BUFFERS; i--;) {
91 if (test_bit(i, &line6pcm->active_urb_in)) {
92 if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
93 struct urb *u = line6pcm->urb_audio_in[i];
94 usb_unlink_urb(u);
95 }
96 }
97 }
98 }
99
100 /*
101 Wait until unlinking of all currently active capture URBs has been
102 finished.
103 */
104 static void wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
105 {
106 int timeout = HZ;
107 unsigned int i;
108 int alive;
109
110 do {
111 alive = 0;
112 for (i = LINE6_ISO_BUFFERS; i--;) {
113 if (test_bit(i, &line6pcm->active_urb_in))
114 alive++;
115 }
116 if (!alive)
117 break;
118 set_current_state(TASK_UNINTERRUPTIBLE);
119 schedule_timeout(1);
120 } while (--timeout > 0);
121 if (alive)
122 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
123
124 line6pcm->active_urb_in = 0;
125 line6pcm->unlink_urb_in = 0;
126 }
127
128 /*
129 Unlink all currently active capture URBs, and wait for finishing.
130 */
131 void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
132 {
133 unlink_audio_in_urbs(line6pcm);
134 wait_clear_audio_in_urbs(line6pcm);
135 }
136
137 /*
138 Callback for completed capture URB.
139 */
140 static void audio_in_callback(struct urb *urb)
141 {
142 int i, index, length = 0, shutdown = 0;
143 int frames;
144 unsigned long flags;
145
146 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)urb->context;
147 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
148 const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
149 struct snd_pcm_runtime *runtime = substream->runtime;
150
151 /* find index of URB */
152 for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
153 if (urb == line6pcm->urb_audio_in[index])
154 break;
155
156 #if DO_DUMP_PCM_RECEIVE
157 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
158 struct usb_iso_packet_descriptor *fout = &urb->iso_frame_desc[i];
159 line6_write_hexdump(line6pcm->line6, 'C', urb->transfer_buffer + fout->offset, fout->length);
160 }
161 #endif
162
163 spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
164
165 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
166 char *fbuf;
167 int fsize;
168 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
169
170 if (fin->status == -18) {
171 shutdown = 1;
172 break;
173 }
174
175 fbuf = urb->transfer_buffer + fin->offset;
176 fsize = fin->actual_length;
177 length += fsize;
178
179 if (fsize > 0) {
180 frames = fsize / bytes_per_frame;
181
182 if (line6pcm->pos_in_done + frames > runtime->buffer_size) {
183 /*
184 The transferred area goes over buffer boundary,
185 copy two separate chunks.
186 */
187 int len;
188 len = runtime->buffer_size - line6pcm->pos_in_done;
189
190 if (len > 0) {
191 memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, len * bytes_per_frame);
192 memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, (frames - len) * bytes_per_frame);
193 } else
194 dev_err(s2m(substream), "driver bug: len = %d\n", len); /* this is somewhat paranoid */
195 } else {
196 /* copy single chunk */
197 memcpy(runtime->dma_area + line6pcm->pos_in_done * bytes_per_frame, fbuf, fsize * bytes_per_frame);
198 }
199
200 if ((line6pcm->pos_in_done += frames) >= runtime->buffer_size)
201 line6pcm->pos_in_done -= runtime->buffer_size;
202 }
203 }
204
205 clear_bit(index, &line6pcm->active_urb_in);
206
207 if (test_bit(index, &line6pcm->unlink_urb_in))
208 shutdown = 1;
209
210 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
211
212 if (!shutdown) {
213 submit_audio_in_urb(substream);
214
215 if ((line6pcm->bytes_in += length) >= line6pcm->period_in) {
216 line6pcm->bytes_in -= line6pcm->period_in;
217 snd_pcm_period_elapsed(substream);
218 }
219 }
220 }
221
222 /* open capture callback */
223 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
224 {
225 int err;
226 struct snd_pcm_runtime *runtime = substream->runtime;
227 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
228
229 err = snd_pcm_hw_constraint_ratdens(runtime, 0,
230 SNDRV_PCM_HW_PARAM_RATE,
231 (&line6pcm->properties->snd_line6_rates));
232 if (err < 0)
233 return err;
234
235 runtime->hw = line6pcm->properties->snd_line6_capture_hw;
236 return 0;
237 }
238
239 /* close capture callback */
240 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
241 {
242 return 0;
243 }
244
245 /* hw_params capture callback */
246 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
247 struct snd_pcm_hw_params *hw_params)
248 {
249 int ret;
250 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
251
252 /* -- Florian Demski [FD] */
253 /* don't ask me why, but this fixes the bug on my machine */
254 if (line6pcm == NULL) {
255 if (substream->pcm == NULL)
256 return -ENOMEM;
257 if (substream->pcm->private_data == NULL)
258 return -ENOMEM;
259 substream->private_data = substream->pcm->private_data;
260 line6pcm = snd_pcm_substream_chip(substream);
261 }
262 /* -- [FD] end */
263
264 ret = snd_pcm_lib_malloc_pages(substream,
265 params_buffer_bytes(hw_params));
266 if (ret < 0)
267 return ret;
268
269 line6pcm->period_in = params_period_bytes(hw_params);
270 line6pcm->buffer_in = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS * LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
271
272 if (!line6pcm->buffer_in) {
273 dev_err(s2m(substream), "cannot malloc buffer_in\n");
274 return -ENOMEM;
275 }
276
277 return 0;
278 }
279
280 /* hw_free capture callback */
281 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
282 {
283 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
284 unlink_wait_clear_audio_in_urbs(line6pcm);
285
286 kfree(line6pcm->buffer_in);
287 line6pcm->buffer_in = NULL;
288
289 return snd_pcm_lib_free_pages(substream);
290 }
291
292 /* trigger callback */
293 int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
294 {
295 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
296 int err;
297 line6pcm->count_in = 0;
298
299 switch (cmd) {
300 case SNDRV_PCM_TRIGGER_START:
301 if (!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
302 err = submit_audio_in_all_urbs(substream);
303
304 if (err < 0) {
305 clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags);
306 return err;
307 }
308 }
309
310 break;
311
312 case SNDRV_PCM_TRIGGER_STOP:
313 if (test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
314 unlink_audio_in_urbs(line6pcm);
315
316 break;
317
318 default:
319 return -EINVAL;
320 }
321
322 return 0;
323 }
324
325 /* capture pointer callback */
326 static snd_pcm_uframes_t
327 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
328 {
329 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
330 return line6pcm->pos_in_done;
331 }
332
333 /* capture operators */
334 struct snd_pcm_ops snd_line6_capture_ops = {
335 .open = snd_line6_capture_open,
336 .close = snd_line6_capture_close,
337 .ioctl = snd_pcm_lib_ioctl,
338 .hw_params = snd_line6_capture_hw_params,
339 .hw_free = snd_line6_capture_hw_free,
340 .prepare = snd_line6_prepare,
341 .trigger = snd_line6_trigger,
342 .pointer = snd_line6_capture_pointer,
343 };
344
345 int create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
346 {
347 int i;
348
349 /* create audio URBs and fill in constant values: */
350 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
351 struct urb *urb;
352
353 /* URB for audio in: */
354 urb = line6pcm->urb_audio_in[i] = usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
355
356 if (urb == NULL) {
357 dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
358 return -ENOMEM;
359 }
360
361 urb->dev = line6pcm->line6->usbdev;
362 urb->pipe = usb_rcvisocpipe(line6pcm->line6->usbdev, line6pcm->ep_audio_read & USB_ENDPOINT_NUMBER_MASK);
363 urb->transfer_flags = URB_ISO_ASAP;
364 urb->start_frame = -1;
365 urb->number_of_packets = LINE6_ISO_PACKETS;
366 urb->interval = LINE6_ISO_INTERVAL;
367 urb->error_count = 0;
368 urb->complete = audio_in_callback;
369 }
370
371 return 0;
372 }
373
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