2 * ALSA PCM device for the
3 * ALSA interface to cobalt PCM capture streams
5 * Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates.
8 * This program is free software; you may redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
13 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
14 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
15 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
16 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
17 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
18 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/vmalloc.h>
25 #include <linux/delay.h>
27 #include <media/v4l2-device.h>
29 #include <sound/core.h>
30 #include <sound/pcm.h>
32 #include "cobalt-driver.h"
33 #include "cobalt-alsa.h"
34 #include "cobalt-alsa-pcm.h"
36 static unsigned int pcm_debug;
37 module_param(pcm_debug, int, 0644);
38 MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
40 #define dprintk(fmt, arg...) \
43 pr_info("cobalt-alsa-pcm %s: " fmt, __func__, ##arg); \
46 static struct snd_pcm_hardware snd_cobalt_hdmi_capture = {
47 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
49 SNDRV_PCM_INFO_INTERLEAVED |
50 SNDRV_PCM_INFO_MMAP_VALID,
52 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
54 .rates = SNDRV_PCM_RATE_48000,
60 .buffer_bytes_max = 4 * 240 * 8 * 4, /* 5 ms of data */
61 .period_bytes_min = 1920, /* 1 sample = 8 * 4 bytes */
62 .period_bytes_max = 240 * 8 * 4, /* 5 ms of 8 channel data */
67 static struct snd_pcm_hardware snd_cobalt_playback = {
68 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
70 SNDRV_PCM_INFO_INTERLEAVED |
71 SNDRV_PCM_INFO_MMAP_VALID,
73 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
75 .rates = SNDRV_PCM_RATE_48000,
81 .buffer_bytes_max = 4 * 240 * 8 * 4, /* 5 ms of data */
82 .period_bytes_min = 1920, /* 1 sample = 8 * 4 bytes */
83 .period_bytes_max = 240 * 8 * 4, /* 5 ms of 8 channel data */
88 static void sample_cpy(u8 *dst, const u8 *src, u32 len, bool is_s32)
90 static const unsigned map[8] = { 0, 1, 5, 4, 2, 3, 6, 7 };
93 while (len >= (is_s32 ? 4 : 2)) {
94 unsigned offset = map[idx] * 4;
95 u32 val = src[offset + 1] + (src[offset + 2] << 8) +
96 (src[offset + 3] << 16);
102 *dst++ = (val >> 8) & 0xff;
103 *dst++ = (val >> 16) & 0xff;
104 len -= is_s32 ? 4 : 2;
109 static void cobalt_alsa_announce_pcm_data(struct snd_cobalt_card *cobsc,
114 struct snd_pcm_substream *substream;
115 struct snd_pcm_runtime *runtime;
119 int length = samples;
120 int period_elapsed = 0;
123 dprintk("cobalt alsa announce ptr=%p data=%p num_bytes=%zd\n", cobsc,
126 substream = cobsc->capture_pcm_substream;
127 if (substream == NULL) {
128 dprintk("substream was NULL\n");
132 runtime = substream->runtime;
133 if (runtime == NULL) {
134 dprintk("runtime was NULL\n");
137 is_s32 = runtime->format == SNDRV_PCM_FORMAT_S32_LE;
139 stride = runtime->frame_bits >> 3;
141 dprintk("stride is zero\n");
146 dprintk("%s: length was zero\n", __func__);
150 if (runtime->dma_area == NULL) {
151 dprintk("dma area was NULL - ignoring\n");
155 oldptr = cobsc->hwptr_done_capture;
156 if (oldptr + length >= runtime->buffer_size) {
157 unsigned int cnt = runtime->buffer_size - oldptr;
160 for (i = 0; i < cnt; i++)
161 sample_cpy(runtime->dma_area + (oldptr + i) * stride,
164 for (i = cnt; i < length; i++)
165 sample_cpy(runtime->dma_area + (i - cnt) * stride,
166 pcm_data + i * skip, stride, is_s32);
170 for (i = 0; i < length; i++)
171 sample_cpy(runtime->dma_area + (oldptr + i) * stride,
175 snd_pcm_stream_lock_irqsave(substream, flags);
177 cobsc->hwptr_done_capture += length;
178 if (cobsc->hwptr_done_capture >=
179 runtime->buffer_size)
180 cobsc->hwptr_done_capture -=
181 runtime->buffer_size;
183 cobsc->capture_transfer_done += length;
184 if (cobsc->capture_transfer_done >=
185 runtime->period_size) {
186 cobsc->capture_transfer_done -=
187 runtime->period_size;
191 snd_pcm_stream_unlock_irqrestore(substream, flags);
194 snd_pcm_period_elapsed(substream);
197 static int alsa_fnc(struct vb2_buffer *vb, void *priv)
199 struct cobalt_stream *s = priv;
200 unsigned char *p = vb2_plane_vaddr(vb, 0);
205 for (i = 0; i < 8 * 4; i++) {
208 pr_cont("%02x", p[i]);
212 cobalt_alsa_announce_pcm_data(s->alsa,
213 vb2_plane_vaddr(vb, 0),
215 vb2_get_plane_payload(vb, 0) / (8 * 4));
219 static int snd_cobalt_pcm_capture_open(struct snd_pcm_substream *substream)
221 struct snd_pcm_runtime *runtime = substream->runtime;
222 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
223 struct cobalt_stream *s = cobsc->s;
225 runtime->hw = snd_cobalt_hdmi_capture;
226 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
227 cobsc->capture_pcm_substream = substream;
228 runtime->private_data = s;
229 cobsc->alsa_record_cnt++;
230 if (cobsc->alsa_record_cnt == 1) {
233 rc = vb2_thread_start(&s->q, alsa_fnc, s, s->vdev.name);
235 cobsc->alsa_record_cnt--;
242 static int snd_cobalt_pcm_capture_close(struct snd_pcm_substream *substream)
244 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
245 struct cobalt_stream *s = cobsc->s;
247 cobsc->alsa_record_cnt--;
248 if (cobsc->alsa_record_cnt == 0)
249 vb2_thread_stop(&s->q);
253 static int snd_cobalt_pcm_ioctl(struct snd_pcm_substream *substream,
254 unsigned int cmd, void *arg)
256 return snd_pcm_lib_ioctl(substream, cmd, arg);
260 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
263 struct snd_pcm_runtime *runtime = subs->runtime;
265 dprintk("Allocating vbuffer\n");
266 if (runtime->dma_area) {
267 if (runtime->dma_bytes > size)
270 vfree(runtime->dma_area);
272 runtime->dma_area = vmalloc(size);
273 if (!runtime->dma_area)
276 runtime->dma_bytes = size;
281 static int snd_cobalt_pcm_hw_params(struct snd_pcm_substream *substream,
282 struct snd_pcm_hw_params *params)
284 dprintk("%s called\n", __func__);
286 return snd_pcm_alloc_vmalloc_buffer(substream,
287 params_buffer_bytes(params));
290 static int snd_cobalt_pcm_hw_free(struct snd_pcm_substream *substream)
292 if (substream->runtime->dma_area) {
293 dprintk("freeing pcm capture region\n");
294 vfree(substream->runtime->dma_area);
295 substream->runtime->dma_area = NULL;
301 static int snd_cobalt_pcm_prepare(struct snd_pcm_substream *substream)
303 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
305 cobsc->hwptr_done_capture = 0;
306 cobsc->capture_transfer_done = 0;
311 static int snd_cobalt_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
314 case SNDRV_PCM_TRIGGER_START:
315 case SNDRV_PCM_TRIGGER_STOP:
324 snd_pcm_uframes_t snd_cobalt_pcm_pointer(struct snd_pcm_substream *substream)
326 snd_pcm_uframes_t hwptr_done;
327 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
329 hwptr_done = cobsc->hwptr_done_capture;
334 static void pb_sample_cpy(u8 *dst, const u8 *src, u32 len, bool is_s32)
336 static const unsigned map[8] = { 0, 1, 5, 4, 2, 3, 6, 7 };
339 while (len >= (is_s32 ? 4 : 2)) {
340 unsigned offset = map[idx] * 4;
341 u8 *out = dst + offset;
352 len -= is_s32 ? 4 : 2;
357 static void cobalt_alsa_pb_pcm_data(struct snd_cobalt_card *cobsc,
362 struct snd_pcm_substream *substream;
363 struct snd_pcm_runtime *runtime;
370 dprintk("cobalt alsa pb ptr=%p data=%p samples=%zd\n", cobsc,
373 substream = cobsc->playback_pcm_substream;
374 if (substream == NULL) {
375 dprintk("substream was NULL\n");
379 runtime = substream->runtime;
380 if (runtime == NULL) {
381 dprintk("runtime was NULL\n");
385 is_s32 = runtime->format == SNDRV_PCM_FORMAT_S32_LE;
386 stride = runtime->frame_bits >> 3;
388 dprintk("stride is zero\n");
393 dprintk("%s: samples was zero\n", __func__);
397 if (runtime->dma_area == NULL) {
398 dprintk("dma area was NULL - ignoring\n");
402 pos = cobsc->pb_pos % cobsc->pb_size;
403 for (i = 0; i < cobsc->pb_count / (8 * 4); i++)
404 pb_sample_cpy(pcm_data + i * skip,
405 runtime->dma_area + pos + i * stride,
407 snd_pcm_stream_lock_irqsave(substream, flags);
409 cobsc->pb_pos += i * stride;
411 snd_pcm_stream_unlock_irqrestore(substream, flags);
412 if (cobsc->pb_pos % cobsc->pb_count == 0)
413 snd_pcm_period_elapsed(substream);
416 static int alsa_pb_fnc(struct vb2_buffer *vb, void *priv)
418 struct cobalt_stream *s = priv;
420 if (s->alsa->alsa_pb_channel)
421 cobalt_alsa_pb_pcm_data(s->alsa,
422 vb2_plane_vaddr(vb, 0),
424 vb2_get_plane_payload(vb, 0) / (8 * 4));
428 static int snd_cobalt_pcm_playback_open(struct snd_pcm_substream *substream)
430 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
431 struct snd_pcm_runtime *runtime = substream->runtime;
432 struct cobalt_stream *s = cobsc->s;
434 runtime->hw = snd_cobalt_playback;
435 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
436 cobsc->playback_pcm_substream = substream;
437 runtime->private_data = s;
438 cobsc->alsa_playback_cnt++;
439 if (cobsc->alsa_playback_cnt == 1) {
442 rc = vb2_thread_start(&s->q, alsa_pb_fnc, s, s->vdev.name);
444 cobsc->alsa_playback_cnt--;
452 static int snd_cobalt_pcm_playback_close(struct snd_pcm_substream *substream)
454 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
455 struct cobalt_stream *s = cobsc->s;
457 cobsc->alsa_playback_cnt--;
458 if (cobsc->alsa_playback_cnt == 0)
459 vb2_thread_stop(&s->q);
463 static int snd_cobalt_pcm_pb_prepare(struct snd_pcm_substream *substream)
465 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
467 cobsc->pb_size = snd_pcm_lib_buffer_bytes(substream);
468 cobsc->pb_count = snd_pcm_lib_period_bytes(substream);
474 static int snd_cobalt_pcm_pb_trigger(struct snd_pcm_substream *substream,
477 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
480 case SNDRV_PCM_TRIGGER_START:
481 if (cobsc->alsa_pb_channel)
483 cobsc->alsa_pb_channel = true;
485 case SNDRV_PCM_TRIGGER_STOP:
486 cobsc->alsa_pb_channel = false;
494 snd_pcm_uframes_t snd_cobalt_pcm_pb_pointer(struct snd_pcm_substream *substream)
496 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
501 return bytes_to_frames(substream->runtime, ptr) %
502 substream->runtime->buffer_size;
505 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
506 unsigned long offset)
508 void *pageptr = subs->runtime->dma_area + offset;
510 return vmalloc_to_page(pageptr);
513 static const struct snd_pcm_ops snd_cobalt_pcm_capture_ops = {
514 .open = snd_cobalt_pcm_capture_open,
515 .close = snd_cobalt_pcm_capture_close,
516 .ioctl = snd_cobalt_pcm_ioctl,
517 .hw_params = snd_cobalt_pcm_hw_params,
518 .hw_free = snd_cobalt_pcm_hw_free,
519 .prepare = snd_cobalt_pcm_prepare,
520 .trigger = snd_cobalt_pcm_trigger,
521 .pointer = snd_cobalt_pcm_pointer,
522 .page = snd_pcm_get_vmalloc_page,
525 static const struct snd_pcm_ops snd_cobalt_pcm_playback_ops = {
526 .open = snd_cobalt_pcm_playback_open,
527 .close = snd_cobalt_pcm_playback_close,
528 .ioctl = snd_cobalt_pcm_ioctl,
529 .hw_params = snd_cobalt_pcm_hw_params,
530 .hw_free = snd_cobalt_pcm_hw_free,
531 .prepare = snd_cobalt_pcm_pb_prepare,
532 .trigger = snd_cobalt_pcm_pb_trigger,
533 .pointer = snd_cobalt_pcm_pb_pointer,
534 .page = snd_pcm_get_vmalloc_page,
537 int snd_cobalt_pcm_create(struct snd_cobalt_card *cobsc)
540 struct snd_card *sc = cobsc->sc;
541 struct cobalt_stream *s = cobsc->s;
542 struct cobalt *cobalt = s->cobalt;
545 s->q.gfp_flags |= __GFP_ZERO;
548 cobalt_s_bit_sysctrl(cobalt,
549 COBALT_SYS_CTRL_AUDIO_IPP_RESETN_BIT(s->video_channel),
552 cobalt_s_bit_sysctrl(cobalt,
553 COBALT_SYS_CTRL_AUDIO_IPP_RESETN_BIT(s->video_channel),
557 ret = snd_pcm_new(sc, "Cobalt PCM-In HDMI",
558 0, /* PCM device 0, the only one for this card */
559 0, /* 0 playback substreams */
560 1, /* 1 capture substream */
563 cobalt_err("snd_cobalt_pcm_create() failed for input with err %d\n",
568 snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
569 &snd_cobalt_pcm_capture_ops);
571 sp->private_data = cobsc;
572 strlcpy(sp->name, "cobalt", sizeof(sp->name));
574 cobalt_s_bit_sysctrl(cobalt,
575 COBALT_SYS_CTRL_AUDIO_OPP_RESETN_BIT, 0);
577 cobalt_s_bit_sysctrl(cobalt,
578 COBALT_SYS_CTRL_AUDIO_OPP_RESETN_BIT, 1);
581 ret = snd_pcm_new(sc, "Cobalt PCM-Out HDMI",
582 0, /* PCM device 0, the only one for this card */
583 1, /* 0 playback substreams */
584 0, /* 1 capture substream */
587 cobalt_err("snd_cobalt_pcm_create() failed for output with err %d\n",
592 snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_PLAYBACK,
593 &snd_cobalt_pcm_playback_ops);
595 sp->private_data = cobsc;
596 strlcpy(sp->name, "cobalt", sizeof(sp->name));