1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ALSA PCM device for the
4 * ALSA interface to cobalt PCM capture streams
5 *
6 * Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates.
7 * All rights reserved.
8 */
9
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/delay.h>
13
14#include <media/v4l2-device.h>
15
16#include <sound/core.h>
17#include <sound/pcm.h>
18
19#include "cobalt-driver.h"
20#include "cobalt-alsa.h"
21#include "cobalt-alsa-pcm.h"
22
23static unsigned int pcm_debug;
24module_param(pcm_debug, int, 0644);
25MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
26
27#define dprintk(fmt, arg...) \
28 do { \
29 if (pcm_debug) \
30 pr_info("cobalt-alsa-pcm %s: " fmt, __func__, ##arg); \
31 } while (0)
32
33static const struct snd_pcm_hardware snd_cobalt_hdmi_capture = {
34 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
35 SNDRV_PCM_INFO_MMAP |
36 SNDRV_PCM_INFO_INTERLEAVED |
37 SNDRV_PCM_INFO_MMAP_VALID,
38
39 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
40
41 .rates = SNDRV_PCM_RATE_48000,
42
43 .rate_min = 48000,
44 .rate_max = 48000,
45 .channels_min = 1,
46 .channels_max = 8,
47 .buffer_bytes_max = 4 * 240 * 8 * 4, /* 5 ms of data */
48 .period_bytes_min = 1920, /* 1 sample = 8 * 4 bytes */
49 .period_bytes_max = 240 * 8 * 4, /* 5 ms of 8 channel data */
50 .periods_min = 1,
51 .periods_max = 4,
52};
53
54static const struct snd_pcm_hardware snd_cobalt_playback = {
55 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
56 SNDRV_PCM_INFO_MMAP |
57 SNDRV_PCM_INFO_INTERLEAVED |
58 SNDRV_PCM_INFO_MMAP_VALID,
59
60 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
61
62 .rates = SNDRV_PCM_RATE_48000,
63
64 .rate_min = 48000,
65 .rate_max = 48000,
66 .channels_min = 1,
67 .channels_max = 8,
68 .buffer_bytes_max = 4 * 240 * 8 * 4, /* 5 ms of data */
69 .period_bytes_min = 1920, /* 1 sample = 8 * 4 bytes */
70 .period_bytes_max = 240 * 8 * 4, /* 5 ms of 8 channel data */
71 .periods_min = 1,
72 .periods_max = 4,
73};
74
75static void sample_cpy(u8 *dst, const u8 *src, u32 len, bool is_s32)
76{
77 static const unsigned map[8] = { 0, 1, 5, 4, 2, 3, 6, 7 };
78 unsigned idx = 0;
79
80 while (len >= (is_s32 ? 4 : 2)) {
81 unsigned offset = map[idx] * 4;
82 u32 val = src[offset + 1] + (src[offset + 2] << 8) +
83 (src[offset + 3] << 16);
84
85 if (is_s32) {
86 *dst++ = 0;
87 *dst++ = val & 0xff;
88 }
89 *dst++ = (val >> 8) & 0xff;
90 *dst++ = (val >> 16) & 0xff;
91 len -= is_s32 ? 4 : 2;
92 idx++;
93 }
94}
95
96static void cobalt_alsa_announce_pcm_data(struct snd_cobalt_card *cobsc,
97 u8 *pcm_data,
98 size_t skip,
99 size_t samples)
100{
101 struct snd_pcm_substream *substream;
102 struct snd_pcm_runtime *runtime;
103 unsigned long flags;
104 unsigned int oldptr;
105 unsigned int stride;
106 int length = samples;
107 int period_elapsed = 0;
108 bool is_s32;
109
110 dprintk("cobalt alsa announce ptr=%p data=%p num_bytes=%zd\n", cobsc,
111 pcm_data, samples);
112
113 substream = cobsc->capture_pcm_substream;
114 if (substream == NULL) {
115 dprintk("substream was NULL\n");
116 return;
117 }
118
119 runtime = substream->runtime;
120 if (runtime == NULL) {
121 dprintk("runtime was NULL\n");
122 return;
123 }
124 is_s32 = runtime->format == SNDRV_PCM_FORMAT_S32_LE;
125
126 stride = runtime->frame_bits >> 3;
127 if (stride == 0) {
128 dprintk("stride is zero\n");
129 return;
130 }
131
132 if (length == 0) {
133 dprintk("%s: length was zero\n", __func__);
134 return;
135 }
136
137 if (runtime->dma_area == NULL) {
138 dprintk("dma area was NULL - ignoring\n");
139 return;
140 }
141
142 oldptr = cobsc->hwptr_done_capture;
143 if (oldptr + length >= runtime->buffer_size) {
144 unsigned int cnt = runtime->buffer_size - oldptr;
145 unsigned i;
146
147 for (i = 0; i < cnt; i++)
148 sample_cpy(dst: runtime->dma_area + (oldptr + i) * stride,
149 src: pcm_data + i * skip,
150 len: stride, is_s32);
151 for (i = cnt; i < length; i++)
152 sample_cpy(dst: runtime->dma_area + (i - cnt) * stride,
153 src: pcm_data + i * skip, len: stride, is_s32);
154 } else {
155 unsigned i;
156
157 for (i = 0; i < length; i++)
158 sample_cpy(dst: runtime->dma_area + (oldptr + i) * stride,
159 src: pcm_data + i * skip,
160 len: stride, is_s32);
161 }
162 snd_pcm_stream_lock_irqsave(substream, flags);
163
164 cobsc->hwptr_done_capture += length;
165 if (cobsc->hwptr_done_capture >=
166 runtime->buffer_size)
167 cobsc->hwptr_done_capture -=
168 runtime->buffer_size;
169
170 cobsc->capture_transfer_done += length;
171 if (cobsc->capture_transfer_done >=
172 runtime->period_size) {
173 cobsc->capture_transfer_done -=
174 runtime->period_size;
175 period_elapsed = 1;
176 }
177
178 snd_pcm_stream_unlock_irqrestore(substream, flags);
179
180 if (period_elapsed)
181 snd_pcm_period_elapsed(substream);
182}
183
184static int alsa_fnc(struct vb2_buffer *vb, void *priv)
185{
186 struct cobalt_stream *s = priv;
187 unsigned char *p = vb2_plane_vaddr(vb, plane_no: 0);
188 int i;
189
190 if (pcm_debug) {
191 pr_info("alsa: ");
192 for (i = 0; i < 8 * 4; i++) {
193 if (!(i & 3))
194 pr_cont(" ");
195 pr_cont("%02x", p[i]);
196 }
197 pr_cont("\n");
198 }
199 cobalt_alsa_announce_pcm_data(cobsc: s->alsa,
200 pcm_data: vb2_plane_vaddr(vb, plane_no: 0),
201 skip: 8 * 4,
202 samples: vb2_get_plane_payload(vb, plane_no: 0) / (8 * 4));
203 return 0;
204}
205
206static int snd_cobalt_pcm_capture_open(struct snd_pcm_substream *substream)
207{
208 struct snd_pcm_runtime *runtime = substream->runtime;
209 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
210 struct cobalt_stream *s = cobsc->s;
211
212 runtime->hw = snd_cobalt_hdmi_capture;
213 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
214 cobsc->capture_pcm_substream = substream;
215 runtime->private_data = s;
216 cobsc->alsa_record_cnt++;
217 if (cobsc->alsa_record_cnt == 1) {
218 int rc;
219
220 rc = vb2_thread_start(q: &s->q, fnc: alsa_fnc, priv: s, thread_name: s->vdev.name);
221 if (rc) {
222 cobsc->alsa_record_cnt--;
223 return rc;
224 }
225 }
226 return 0;
227}
228
229static int snd_cobalt_pcm_capture_close(struct snd_pcm_substream *substream)
230{
231 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
232 struct cobalt_stream *s = cobsc->s;
233
234 cobsc->alsa_record_cnt--;
235 if (cobsc->alsa_record_cnt == 0)
236 vb2_thread_stop(q: &s->q);
237 return 0;
238}
239
240static int snd_cobalt_pcm_prepare(struct snd_pcm_substream *substream)
241{
242 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
243
244 cobsc->hwptr_done_capture = 0;
245 cobsc->capture_transfer_done = 0;
246
247 return 0;
248}
249
250static int snd_cobalt_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
251{
252 switch (cmd) {
253 case SNDRV_PCM_TRIGGER_START:
254 case SNDRV_PCM_TRIGGER_STOP:
255 return 0;
256 default:
257 return -EINVAL;
258 }
259 return 0;
260}
261
262static
263snd_pcm_uframes_t snd_cobalt_pcm_pointer(struct snd_pcm_substream *substream)
264{
265 snd_pcm_uframes_t hwptr_done;
266 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
267
268 hwptr_done = cobsc->hwptr_done_capture;
269
270 return hwptr_done;
271}
272
273static void pb_sample_cpy(u8 *dst, const u8 *src, u32 len, bool is_s32)
274{
275 static const unsigned map[8] = { 0, 1, 5, 4, 2, 3, 6, 7 };
276 unsigned idx = 0;
277
278 while (len >= (is_s32 ? 4 : 2)) {
279 unsigned offset = map[idx] * 4;
280 u8 *out = dst + offset;
281
282 *out++ = 0;
283 if (is_s32) {
284 src++;
285 *out++ = *src++;
286 } else {
287 *out++ = 0;
288 }
289 *out++ = *src++;
290 *out = *src++;
291 len -= is_s32 ? 4 : 2;
292 idx++;
293 }
294}
295
296static void cobalt_alsa_pb_pcm_data(struct snd_cobalt_card *cobsc,
297 u8 *pcm_data,
298 size_t skip,
299 size_t samples)
300{
301 struct snd_pcm_substream *substream;
302 struct snd_pcm_runtime *runtime;
303 unsigned long flags;
304 unsigned int pos;
305 unsigned int stride;
306 bool is_s32;
307 unsigned i;
308
309 dprintk("cobalt alsa pb ptr=%p data=%p samples=%zd\n", cobsc,
310 pcm_data, samples);
311
312 substream = cobsc->playback_pcm_substream;
313 if (substream == NULL) {
314 dprintk("substream was NULL\n");
315 return;
316 }
317
318 runtime = substream->runtime;
319 if (runtime == NULL) {
320 dprintk("runtime was NULL\n");
321 return;
322 }
323
324 is_s32 = runtime->format == SNDRV_PCM_FORMAT_S32_LE;
325 stride = runtime->frame_bits >> 3;
326 if (stride == 0) {
327 dprintk("stride is zero\n");
328 return;
329 }
330
331 if (samples == 0) {
332 dprintk("%s: samples was zero\n", __func__);
333 return;
334 }
335
336 if (runtime->dma_area == NULL) {
337 dprintk("dma area was NULL - ignoring\n");
338 return;
339 }
340
341 pos = cobsc->pb_pos % cobsc->pb_size;
342 for (i = 0; i < cobsc->pb_count / (8 * 4); i++)
343 pb_sample_cpy(dst: pcm_data + i * skip,
344 src: runtime->dma_area + pos + i * stride,
345 len: stride, is_s32);
346 snd_pcm_stream_lock_irqsave(substream, flags);
347
348 cobsc->pb_pos += i * stride;
349
350 snd_pcm_stream_unlock_irqrestore(substream, flags);
351 if (cobsc->pb_pos % cobsc->pb_count == 0)
352 snd_pcm_period_elapsed(substream);
353}
354
355static int alsa_pb_fnc(struct vb2_buffer *vb, void *priv)
356{
357 struct cobalt_stream *s = priv;
358
359 if (s->alsa->alsa_pb_channel)
360 cobalt_alsa_pb_pcm_data(cobsc: s->alsa,
361 pcm_data: vb2_plane_vaddr(vb, plane_no: 0),
362 skip: 8 * 4,
363 samples: vb2_get_plane_payload(vb, plane_no: 0) / (8 * 4));
364 return 0;
365}
366
367static int snd_cobalt_pcm_playback_open(struct snd_pcm_substream *substream)
368{
369 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
370 struct snd_pcm_runtime *runtime = substream->runtime;
371 struct cobalt_stream *s = cobsc->s;
372
373 runtime->hw = snd_cobalt_playback;
374 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
375 cobsc->playback_pcm_substream = substream;
376 runtime->private_data = s;
377 cobsc->alsa_playback_cnt++;
378 if (cobsc->alsa_playback_cnt == 1) {
379 int rc;
380
381 rc = vb2_thread_start(q: &s->q, fnc: alsa_pb_fnc, priv: s, thread_name: s->vdev.name);
382 if (rc) {
383 cobsc->alsa_playback_cnt--;
384 return rc;
385 }
386 }
387
388 return 0;
389}
390
391static int snd_cobalt_pcm_playback_close(struct snd_pcm_substream *substream)
392{
393 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
394 struct cobalt_stream *s = cobsc->s;
395
396 cobsc->alsa_playback_cnt--;
397 if (cobsc->alsa_playback_cnt == 0)
398 vb2_thread_stop(q: &s->q);
399 return 0;
400}
401
402static int snd_cobalt_pcm_pb_prepare(struct snd_pcm_substream *substream)
403{
404 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
405
406 cobsc->pb_size = snd_pcm_lib_buffer_bytes(substream);
407 cobsc->pb_count = snd_pcm_lib_period_bytes(substream);
408 cobsc->pb_pos = 0;
409
410 return 0;
411}
412
413static int snd_cobalt_pcm_pb_trigger(struct snd_pcm_substream *substream,
414 int cmd)
415{
416 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
417
418 switch (cmd) {
419 case SNDRV_PCM_TRIGGER_START:
420 if (cobsc->alsa_pb_channel)
421 return -EBUSY;
422 cobsc->alsa_pb_channel = true;
423 return 0;
424 case SNDRV_PCM_TRIGGER_STOP:
425 cobsc->alsa_pb_channel = false;
426 return 0;
427 default:
428 return -EINVAL;
429 }
430}
431
432static
433snd_pcm_uframes_t snd_cobalt_pcm_pb_pointer(struct snd_pcm_substream *substream)
434{
435 struct snd_cobalt_card *cobsc = snd_pcm_substream_chip(substream);
436 size_t ptr;
437
438 ptr = cobsc->pb_pos;
439
440 return bytes_to_frames(runtime: substream->runtime, size: ptr) %
441 substream->runtime->buffer_size;
442}
443
444static const struct snd_pcm_ops snd_cobalt_pcm_capture_ops = {
445 .open = snd_cobalt_pcm_capture_open,
446 .close = snd_cobalt_pcm_capture_close,
447 .prepare = snd_cobalt_pcm_prepare,
448 .trigger = snd_cobalt_pcm_trigger,
449 .pointer = snd_cobalt_pcm_pointer,
450};
451
452static const struct snd_pcm_ops snd_cobalt_pcm_playback_ops = {
453 .open = snd_cobalt_pcm_playback_open,
454 .close = snd_cobalt_pcm_playback_close,
455 .prepare = snd_cobalt_pcm_pb_prepare,
456 .trigger = snd_cobalt_pcm_pb_trigger,
457 .pointer = snd_cobalt_pcm_pb_pointer,
458};
459
460int snd_cobalt_pcm_create(struct snd_cobalt_card *cobsc)
461{
462 struct snd_pcm *sp;
463 struct snd_card *sc = cobsc->sc;
464 struct cobalt_stream *s = cobsc->s;
465 struct cobalt *cobalt = s->cobalt;
466 int ret;
467
468 s->q.gfp_flags |= __GFP_ZERO;
469
470 if (!s->is_output) {
471 cobalt_s_bit_sysctrl(cobalt,
472 COBALT_SYS_CTRL_AUDIO_IPP_RESETN_BIT(s->video_channel),
473 val: 0);
474 mdelay(2);
475 cobalt_s_bit_sysctrl(cobalt,
476 COBALT_SYS_CTRL_AUDIO_IPP_RESETN_BIT(s->video_channel),
477 val: 1);
478 mdelay(1);
479
480 ret = snd_pcm_new(card: sc, id: "Cobalt PCM-In HDMI",
481 device: 0, /* PCM device 0, the only one for this card */
482 playback_count: 0, /* 0 playback substreams */
483 capture_count: 1, /* 1 capture substream */
484 rpcm: &sp);
485 if (ret) {
486 cobalt_err("snd_cobalt_pcm_create() failed for input with err %d\n",
487 ret);
488 goto err_exit;
489 }
490
491 snd_pcm_set_ops(pcm: sp, direction: SNDRV_PCM_STREAM_CAPTURE,
492 ops: &snd_cobalt_pcm_capture_ops);
493 snd_pcm_set_managed_buffer_all(pcm: sp, SNDRV_DMA_TYPE_VMALLOC,
494 NULL, size: 0, max: 0);
495 sp->info_flags = 0;
496 sp->private_data = cobsc;
497 strscpy(sp->name, "cobalt", sizeof(sp->name));
498 } else {
499 cobalt_s_bit_sysctrl(cobalt,
500 COBALT_SYS_CTRL_AUDIO_OPP_RESETN_BIT, val: 0);
501 mdelay(2);
502 cobalt_s_bit_sysctrl(cobalt,
503 COBALT_SYS_CTRL_AUDIO_OPP_RESETN_BIT, val: 1);
504 mdelay(1);
505
506 ret = snd_pcm_new(card: sc, id: "Cobalt PCM-Out HDMI",
507 device: 0, /* PCM device 0, the only one for this card */
508 playback_count: 1, /* 0 playback substreams */
509 capture_count: 0, /* 1 capture substream */
510 rpcm: &sp);
511 if (ret) {
512 cobalt_err("snd_cobalt_pcm_create() failed for output with err %d\n",
513 ret);
514 goto err_exit;
515 }
516
517 snd_pcm_set_ops(pcm: sp, direction: SNDRV_PCM_STREAM_PLAYBACK,
518 ops: &snd_cobalt_pcm_playback_ops);
519 snd_pcm_set_managed_buffer_all(pcm: sp, SNDRV_DMA_TYPE_VMALLOC,
520 NULL, size: 0, max: 0);
521 sp->info_flags = 0;
522 sp->private_data = cobsc;
523 strscpy(sp->name, "cobalt", sizeof(sp->name));
524 }
525
526 return 0;
527
528err_exit:
529 return ret;
530}
531

source code of linux/drivers/media/pci/cobalt/cobalt-alsa-pcm.c