tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * digi00x-pcm.c - a part of driver for Digidesign Digi 002/003 family
4 *
5 * Copyright (c) 2014-2015 Takashi Sakamoto
6 */
7
8#include "digi00x.h"
9
10static int hw_rule_rate(struct snd_pcm_hw_params *params,
11 struct snd_pcm_hw_rule *rule)
12{
13 struct snd_interval *r =
14 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
15 const struct snd_interval *c =
16 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
17 struct snd_interval t = {
18 .min = UINT_MAX, .max = 0, .integer = 1,
19 };
20 unsigned int i;
21
22 for (i = 0; i < SND_DG00X_RATE_COUNT; i++) {
23 if (!snd_interval_test(c,
24 snd_dg00x_stream_pcm_channels[i]))
25 continue;
26
27 t.min = min(t.min, snd_dg00x_stream_rates[i]);
28 t.max = max(t.max, snd_dg00x_stream_rates[i]);
29 }
30
31 return snd_interval_refine(r, &t);
32}
33
34static int hw_rule_channels(struct snd_pcm_hw_params *params,
35 struct snd_pcm_hw_rule *rule)
36{
37 struct snd_interval *c =
38 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
39 const struct snd_interval *r =
40 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
41 struct snd_interval t = {
42 .min = UINT_MAX, .max = 0, .integer = 1,
43 };
44 unsigned int i;
45
46 for (i = 0; i < SND_DG00X_RATE_COUNT; i++) {
47 if (!snd_interval_test(r, snd_dg00x_stream_rates[i]))
48 continue;
49
50 t.min = min(t.min, snd_dg00x_stream_pcm_channels[i]);
51 t.max = max(t.max, snd_dg00x_stream_pcm_channels[i]);
52 }
53
54 return snd_interval_refine(c, &t);
55}
56
57static int pcm_init_hw_params(struct snd_dg00x *dg00x,
58 struct snd_pcm_substream *substream)
59{
60 struct snd_pcm_runtime *runtime = substream->runtime;
61 struct snd_pcm_hardware *hw = &runtime->hw;
62 struct amdtp_stream *s;
63 int err;
64
65
66 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
67 substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
68 s = &dg00x->tx_stream;
69 } else {
70 substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
71 s = &dg00x->rx_stream;
72 }
73
74 hw->channels_min = 10;
75 hw->channels_max = 18;
76
77 hw->rates = SNDRV_PCM_RATE_44100 |
78 SNDRV_PCM_RATE_48000 |
79 SNDRV_PCM_RATE_88200 |
80 SNDRV_PCM_RATE_96000;
81 snd_pcm_limit_hw_rates(runtime);
82
83 err = snd_pcm_hw_rule_add(substream->runtime, 0,
84 SNDRV_PCM_HW_PARAM_CHANNELS,
85 hw_rule_channels, NULL,
86 SNDRV_PCM_HW_PARAM_RATE, -1);
87 if (err < 0)
88 return err;
89
90 err = snd_pcm_hw_rule_add(substream->runtime, 0,
91 SNDRV_PCM_HW_PARAM_RATE,
92 hw_rule_rate, NULL,
93 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
94 if (err < 0)
95 return err;
96
97 return amdtp_dot_add_pcm_hw_constraints(s, substream->runtime);
98}
99
100static int pcm_open(struct snd_pcm_substream *substream)
101{
102 struct snd_dg00x *dg00x = substream->private_data;
103 struct amdtp_domain *d = &dg00x->domain;
104 enum snd_dg00x_clock clock;
105 bool detect;
106 int err;
107
108 err = snd_dg00x_stream_lock_try(dg00x);
109 if (err < 0)
110 return err;
111
112 err = pcm_init_hw_params(dg00x, substream);
113 if (err < 0)
114 goto err_locked;
115
116 /* Check current clock source. */
117 err = snd_dg00x_stream_get_clock(dg00x, &clock);
118 if (err < 0)
119 goto err_locked;
120 if (clock != SND_DG00X_CLOCK_INTERNAL) {
121 err = snd_dg00x_stream_check_external_clock(dg00x, &detect);
122 if (err < 0)
123 goto err_locked;
124 if (!detect) {
125 err = -EBUSY;
126 goto err_locked;
127 }
128 }
129
130 scoped_guard(mutex, &dg00x->mutex) {
131 // When source of clock is not internal or any stream is reserved for
132 // transmission of PCM frames, the available sampling rate is limited
133 // at current one.
134 if ((clock != SND_DG00X_CLOCK_INTERNAL) ||
135 (dg00x->substreams_counter > 0 && d->events_per_period > 0)) {
136 unsigned int frames_per_period = d->events_per_period;
137 unsigned int frames_per_buffer = d->events_per_buffer;
138 unsigned int rate;
139
140 err = snd_dg00x_stream_get_external_rate(dg00x, &rate);
141 if (err < 0)
142 goto err_locked;
143 substream->runtime->hw.rate_min = rate;
144 substream->runtime->hw.rate_max = rate;
145
146 if (frames_per_period > 0) {
147 err = snd_pcm_hw_constraint_minmax(substream->runtime,
148 SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
149 frames_per_period, frames_per_period);
150 if (err < 0)
151 goto err_locked;
152
153 err = snd_pcm_hw_constraint_minmax(substream->runtime,
154 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
155 frames_per_buffer, frames_per_buffer);
156 if (err < 0)
157 goto err_locked;
158 }
159 }
160 }
161
162 snd_pcm_set_sync(substream);
163
164 return 0;
165err_locked:
166 snd_dg00x_stream_lock_release(dg00x);
167 return err;
168}
169
170static int pcm_close(struct snd_pcm_substream *substream)
171{
172 struct snd_dg00x *dg00x = substream->private_data;
173
174 snd_dg00x_stream_lock_release(dg00x);
175
176 return 0;
177}
178
179static int pcm_hw_params(struct snd_pcm_substream *substream,
180 struct snd_pcm_hw_params *hw_params)
181{
182 struct snd_dg00x *dg00x = substream->private_data;
183 int err = 0;
184
185 if (substream->runtime->state == SNDRV_PCM_STATE_OPEN) {
186 unsigned int rate = params_rate(hw_params);
187 unsigned int frames_per_period = params_period_size(hw_params);
188 unsigned int frames_per_buffer = params_buffer_size(hw_params);
189
190 guard(mutex)(&dg00x->mutex);
191 err = snd_dg00x_stream_reserve_duplex(dg00x, rate,
192 frames_per_period, frames_per_buffer);
193 if (err >= 0)
194 ++dg00x->substreams_counter;
195 }
196
197 return err;
198}
199
200static int pcm_hw_free(struct snd_pcm_substream *substream)
201{
202 struct snd_dg00x *dg00x = substream->private_data;
203
204 guard(mutex)(&dg00x->mutex);
205
206 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
207 --dg00x->substreams_counter;
208
209 snd_dg00x_stream_stop_duplex(dg00x);
210
211 return 0;
212}
213
214static int pcm_capture_prepare(struct snd_pcm_substream *substream)
215{
216 struct snd_dg00x *dg00x = substream->private_data;
217 int err;
218
219 guard(mutex)(&dg00x->mutex);
220
221 err = snd_dg00x_stream_start_duplex(dg00x);
222 if (err >= 0)
223 amdtp_stream_pcm_prepare(&dg00x->tx_stream);
224
225 return err;
226}
227
228static int pcm_playback_prepare(struct snd_pcm_substream *substream)
229{
230 struct snd_dg00x *dg00x = substream->private_data;
231 int err;
232
233 guard(mutex)(&dg00x->mutex);
234
235 err = snd_dg00x_stream_start_duplex(dg00x);
236 if (err >= 0) {
237 amdtp_stream_pcm_prepare(&dg00x->rx_stream);
238 amdtp_dot_reset(&dg00x->rx_stream);
239 }
240
241 return err;
242}
243
244static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
245{
246 struct snd_dg00x *dg00x = substream->private_data;
247
248 switch (cmd) {
249 case SNDRV_PCM_TRIGGER_START:
250 amdtp_stream_pcm_trigger(&dg00x->tx_stream, substream);
251 break;
252 case SNDRV_PCM_TRIGGER_STOP:
253 amdtp_stream_pcm_trigger(&dg00x->tx_stream, NULL);
254 break;
255 default:
256 return -EINVAL;
257 }
258
259 return 0;
260}
261
262static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
263{
264 struct snd_dg00x *dg00x = substream->private_data;
265
266 switch (cmd) {
267 case SNDRV_PCM_TRIGGER_START:
268 amdtp_stream_pcm_trigger(&dg00x->rx_stream, substream);
269 break;
270 case SNDRV_PCM_TRIGGER_STOP:
271 amdtp_stream_pcm_trigger(&dg00x->rx_stream, NULL);
272 break;
273 default:
274 return -EINVAL;
275 }
276
277 return 0;
278}
279
280static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
281{
282 struct snd_dg00x *dg00x = sbstrm->private_data;
283
284 return amdtp_domain_stream_pcm_pointer(&dg00x->domain, &dg00x->tx_stream);
285}
286
287static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
288{
289 struct snd_dg00x *dg00x = sbstrm->private_data;
290
291 return amdtp_domain_stream_pcm_pointer(&dg00x->domain, &dg00x->rx_stream);
292}
293
294static int pcm_capture_ack(struct snd_pcm_substream *substream)
295{
296 struct snd_dg00x *dg00x = substream->private_data;
297
298 return amdtp_domain_stream_pcm_ack(&dg00x->domain, &dg00x->tx_stream);
299}
300
301static int pcm_playback_ack(struct snd_pcm_substream *substream)
302{
303 struct snd_dg00x *dg00x = substream->private_data;
304
305 return amdtp_domain_stream_pcm_ack(&dg00x->domain, &dg00x->rx_stream);
306}
307
308int snd_dg00x_create_pcm_devices(struct snd_dg00x *dg00x)
309{
310 static const struct snd_pcm_ops capture_ops = {
311 .open = pcm_open,
312 .close = pcm_close,
313 .hw_params = pcm_hw_params,
314 .hw_free = pcm_hw_free,
315 .prepare = pcm_capture_prepare,
316 .trigger = pcm_capture_trigger,
317 .pointer = pcm_capture_pointer,
318 .ack = pcm_capture_ack,
319 };
320 static const struct snd_pcm_ops playback_ops = {
321 .open = pcm_open,
322 .close = pcm_close,
323 .hw_params = pcm_hw_params,
324 .hw_free = pcm_hw_free,
325 .prepare = pcm_playback_prepare,
326 .trigger = pcm_playback_trigger,
327 .pointer = pcm_playback_pointer,
328 .ack = pcm_playback_ack,
329 };
330 struct snd_pcm *pcm;
331 int err;
332
333 err = snd_pcm_new(dg00x->card, dg00x->card->driver, 0, 1, 1, &pcm);
334 if (err < 0)
335 return err;
336
337 pcm->private_data = dg00x;
338 pcm->nonatomic = true;
339 snprintf(pcm->name, sizeof(pcm->name),
340 "%s PCM", dg00x->card->shortname);
341 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
342 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
343 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
344
345 return 0;
346}