2 * Line6 Linux USB driver - 0.8.0
4 * Copyright (C) 2004-2009 Markus Grabner (grabner@icg.tugraz.at)
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.
14 #include <sound/core.h>
15 #include <sound/pcm.h>
16 #include <sound/pcm_params.h>
24 Find a free URB and submit it.
26 static int submit_audio_in_urb(struct snd_pcm_substream *substream)
30 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
34 spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
36 find_first_zero_bit(&line6pcm->active_urb_in, LINE6_ISO_BUFFERS);
38 if (index >= LINE6_ISO_BUFFERS) {
39 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
40 dev_err(s2m(substream), "no free URB found\n");
44 urb_in = line6pcm->urb_audio_in[index];
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;
55 urb_in->transfer_buffer =
57 index * LINE6_ISO_PACKETS * line6pcm->max_packet_size;
58 urb_in->transfer_buffer_length = urb_size;
59 urb_in->context = substream;
61 if (usb_submit_urb(urb_in, GFP_ATOMIC) == 0)
62 set_bit(index, &line6pcm->active_urb_in);
64 dev_err(s2m(substream), "URB in #%d submission failed\n",
67 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
72 Submit all currently available capture URBs.
74 static int submit_audio_in_all_urbs(struct snd_pcm_substream *substream)
78 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
79 ret = submit_audio_in_urb(substream);
88 Unlink all currently active capture URBs.
90 static void unlink_audio_in_urbs(struct snd_line6_pcm *line6pcm)
94 for (i = LINE6_ISO_BUFFERS; i--;) {
95 if (test_bit(i, &line6pcm->active_urb_in)) {
96 if (!test_and_set_bit(i, &line6pcm->unlink_urb_in)) {
97 struct urb *u = line6pcm->urb_audio_in[i];
105 Wait until unlinking of all currently active capture URBs has been
108 static void wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
116 for (i = LINE6_ISO_BUFFERS; i--;) {
117 if (test_bit(i, &line6pcm->active_urb_in))
122 set_current_state(TASK_UNINTERRUPTIBLE);
124 } while (--timeout > 0);
126 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
128 line6pcm->active_urb_in = 0;
129 line6pcm->unlink_urb_in = 0;
133 Unlink all currently active capture URBs, and wait for finishing.
135 void unlink_wait_clear_audio_in_urbs(struct snd_line6_pcm *line6pcm)
137 unlink_audio_in_urbs(line6pcm);
138 wait_clear_audio_in_urbs(line6pcm);
142 Callback for completed capture URB.
144 static void audio_in_callback(struct urb *urb)
146 int i, index, length = 0, shutdown = 0;
150 struct snd_pcm_substream *substream =
151 (struct snd_pcm_substream *)urb->context;
152 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
153 const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
154 struct snd_pcm_runtime *runtime = substream->runtime;
156 /* find index of URB */
157 for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
158 if (urb == line6pcm->urb_audio_in[index])
161 #if DO_DUMP_PCM_RECEIVE
162 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
163 struct usb_iso_packet_descriptor *fout =
164 &urb->iso_frame_desc[i];
165 line6_write_hexdump(line6pcm->line6, 'C',
166 urb->transfer_buffer + fout->offset,
171 spin_lock_irqsave(&line6pcm->lock_audio_in, flags);
173 for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
176 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];
178 if (fin->status == -18) {
183 fbuf = urb->transfer_buffer + fin->offset;
184 fsize = fin->actual_length;
188 frames = fsize / bytes_per_frame;
190 if (line6pcm->pos_in_done + frames >
191 runtime->buffer_size) {
193 The transferred area goes over buffer
194 boundary, copy two separate chunks.
198 runtime->buffer_size -
199 line6pcm->pos_in_done;
202 memcpy(runtime->dma_area +
203 line6pcm->pos_in_done *
204 bytes_per_frame, fbuf,
205 len * bytes_per_frame);
206 memcpy(runtime->dma_area,
207 fbuf + len * bytes_per_frame,
209 len) * bytes_per_frame);
211 /* this is somewhat paranoid */
212 dev_err(s2m(substream),
213 "driver bug: len = %d\n", len);
216 /* copy single chunk */
217 memcpy(runtime->dma_area +
218 line6pcm->pos_in_done * bytes_per_frame,
219 fbuf, fsize * bytes_per_frame);
222 line6pcm->pos_in_done += frames;
223 if (line6pcm->pos_in_done >= runtime->buffer_size)
224 line6pcm->pos_in_done -= runtime->buffer_size;
228 clear_bit(index, &line6pcm->active_urb_in);
230 if (test_bit(index, &line6pcm->unlink_urb_in))
233 spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);
236 submit_audio_in_urb(substream);
238 line6pcm->bytes_in += length;
239 if (line6pcm->bytes_in >= line6pcm->period_in) {
240 line6pcm->bytes_in -= line6pcm->period_in;
241 snd_pcm_period_elapsed(substream);
246 /* open capture callback */
247 static int snd_line6_capture_open(struct snd_pcm_substream *substream)
250 struct snd_pcm_runtime *runtime = substream->runtime;
251 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
253 err = snd_pcm_hw_constraint_ratdens(runtime, 0,
254 SNDRV_PCM_HW_PARAM_RATE,
255 (&line6pcm->properties->
260 runtime->hw = line6pcm->properties->snd_line6_capture_hw;
264 /* close capture callback */
265 static int snd_line6_capture_close(struct snd_pcm_substream *substream)
270 /* hw_params capture callback */
271 static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
272 struct snd_pcm_hw_params *hw_params)
275 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
277 /* -- Florian Demski [FD] */
278 /* don't ask me why, but this fixes the bug on my machine */
279 if (line6pcm == NULL) {
280 if (substream->pcm == NULL)
282 if (substream->pcm->private_data == NULL)
284 substream->private_data = substream->pcm->private_data;
285 line6pcm = snd_pcm_substream_chip(substream);
289 ret = snd_pcm_lib_malloc_pages(substream,
290 params_buffer_bytes(hw_params));
294 line6pcm->period_in = params_period_bytes(hw_params);
295 line6pcm->buffer_in =
296 kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
297 LINE6_ISO_PACKET_SIZE_MAX, GFP_KERNEL);
299 if (!line6pcm->buffer_in) {
300 dev_err(s2m(substream), "cannot malloc buffer_in\n");
307 /* hw_free capture callback */
308 static int snd_line6_capture_hw_free(struct snd_pcm_substream *substream)
310 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
311 unlink_wait_clear_audio_in_urbs(line6pcm);
313 kfree(line6pcm->buffer_in);
314 line6pcm->buffer_in = NULL;
316 return snd_pcm_lib_free_pages(substream);
319 /* trigger callback */
320 int snd_line6_capture_trigger(struct snd_pcm_substream *substream, int cmd)
322 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
324 line6pcm->count_in = 0;
327 case SNDRV_PCM_TRIGGER_START:
328 if (!test_and_set_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags)) {
329 err = submit_audio_in_all_urbs(substream);
332 clear_bit(BIT_RUNNING_CAPTURE,
340 case SNDRV_PCM_TRIGGER_STOP:
341 if (test_and_clear_bit(BIT_RUNNING_CAPTURE, &line6pcm->flags))
342 unlink_audio_in_urbs(line6pcm);
353 /* capture pointer callback */
354 static snd_pcm_uframes_t
355 snd_line6_capture_pointer(struct snd_pcm_substream *substream)
357 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
358 return line6pcm->pos_in_done;
361 /* capture operators */
362 struct snd_pcm_ops snd_line6_capture_ops = {
363 .open = snd_line6_capture_open,
364 .close = snd_line6_capture_close,
365 .ioctl = snd_pcm_lib_ioctl,
366 .hw_params = snd_line6_capture_hw_params,
367 .hw_free = snd_line6_capture_hw_free,
368 .prepare = snd_line6_prepare,
369 .trigger = snd_line6_trigger,
370 .pointer = snd_line6_capture_pointer,
373 int create_audio_in_urbs(struct snd_line6_pcm *line6pcm)
377 /* create audio URBs and fill in constant values: */
378 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) {
381 /* URB for audio in: */
382 urb = line6pcm->urb_audio_in[i] =
383 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL);
386 dev_err(line6pcm->line6->ifcdev, "Out of memory\n");
390 urb->dev = line6pcm->line6->usbdev;
392 usb_rcvisocpipe(line6pcm->line6->usbdev,
394 ep_audio_read & USB_ENDPOINT_NUMBER_MASK);
395 urb->transfer_flags = URB_ISO_ASAP;
396 urb->start_frame = -1;
397 urb->number_of_packets = LINE6_ISO_PACKETS;
398 urb->interval = LINE6_ISO_INTERVAL;
399 urb->error_count = 0;
400 urb->complete = audio_in_callback;