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Linux/sound/firewire/bebob/bebob_pcm.c

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  1 /*
  2  * bebob_pcm.c - a part of driver for BeBoB based devices
  3  *
  4  * Copyright (c) 2013-2014 Takashi Sakamoto
  5  *
  6  * Licensed under the terms of the GNU General Public License, version 2.
  7  */
  8 
  9 #include "./bebob.h"
 10 
 11 static int
 12 hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
 13 {
 14         struct snd_bebob_stream_formation *formations = rule->private;
 15         struct snd_interval *r =
 16                 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 17         const struct snd_interval *c =
 18                 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 19         struct snd_interval t = {
 20                 .min = UINT_MAX, .max = 0, .integer = 1
 21         };
 22         unsigned int i;
 23 
 24         for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
 25                 /* entry is invalid */
 26                 if (formations[i].pcm == 0)
 27                         continue;
 28 
 29                 if (!snd_interval_test(c, formations[i].pcm))
 30                         continue;
 31 
 32                 t.min = min(t.min, snd_bebob_rate_table[i]);
 33                 t.max = max(t.max, snd_bebob_rate_table[i]);
 34 
 35         }
 36         return snd_interval_refine(r, &t);
 37 }
 38 
 39 static int
 40 hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
 41 {
 42         struct snd_bebob_stream_formation *formations = rule->private;
 43         struct snd_interval *c =
 44                 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 45         const struct snd_interval *r =
 46                 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
 47         struct snd_interval t = {
 48                 .min = UINT_MAX, .max = 0, .integer = 1
 49         };
 50 
 51         unsigned int i;
 52 
 53         for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
 54                 /* entry is invalid */
 55                 if (formations[i].pcm == 0)
 56                         continue;
 57 
 58                 if (!snd_interval_test(r, snd_bebob_rate_table[i]))
 59                         continue;
 60 
 61                 t.min = min(t.min, formations[i].pcm);
 62                 t.max = max(t.max, formations[i].pcm);
 63         }
 64 
 65         return snd_interval_refine(c, &t);
 66 }
 67 
 68 static void
 69 limit_channels_and_rates(struct snd_pcm_hardware *hw,
 70                          struct snd_bebob_stream_formation *formations)
 71 {
 72         unsigned int i;
 73 
 74         hw->channels_min = UINT_MAX;
 75         hw->channels_max = 0;
 76 
 77         hw->rate_min = UINT_MAX;
 78         hw->rate_max = 0;
 79         hw->rates = 0;
 80 
 81         for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
 82                 /* entry has no PCM channels */
 83                 if (formations[i].pcm == 0)
 84                         continue;
 85 
 86                 hw->channels_min = min(hw->channels_min, formations[i].pcm);
 87                 hw->channels_max = max(hw->channels_max, formations[i].pcm);
 88 
 89                 hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]);
 90                 hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]);
 91                 hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]);
 92         }
 93 }
 94 
 95 static int
 96 pcm_init_hw_params(struct snd_bebob *bebob,
 97                    struct snd_pcm_substream *substream)
 98 {
 99         struct snd_pcm_runtime *runtime = substream->runtime;
100         struct amdtp_stream *s;
101         struct snd_bebob_stream_formation *formations;
102         int err;
103 
104         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
105                 runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS;
106                 s = &bebob->tx_stream;
107                 formations = bebob->tx_stream_formations;
108         } else {
109                 runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS;
110                 s = &bebob->rx_stream;
111                 formations = bebob->rx_stream_formations;
112         }
113 
114         limit_channels_and_rates(&runtime->hw, formations);
115 
116         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
117                                   hw_rule_channels, formations,
118                                   SNDRV_PCM_HW_PARAM_RATE, -1);
119         if (err < 0)
120                 goto end;
121 
122         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
123                                   hw_rule_rate, formations,
124                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
125         if (err < 0)
126                 goto end;
127 
128         err = amdtp_am824_add_pcm_hw_constraints(s, runtime);
129 end:
130         return err;
131 }
132 
133 static int
134 pcm_open(struct snd_pcm_substream *substream)
135 {
136         struct snd_bebob *bebob = substream->private_data;
137         const struct snd_bebob_rate_spec *spec = bebob->spec->rate;
138         unsigned int sampling_rate;
139         enum snd_bebob_clock_type src;
140         int err;
141 
142         err = snd_bebob_stream_lock_try(bebob);
143         if (err < 0)
144                 goto end;
145 
146         err = pcm_init_hw_params(bebob, substream);
147         if (err < 0)
148                 goto err_locked;
149 
150         err = snd_bebob_stream_get_clock_src(bebob, &src);
151         if (err < 0)
152                 goto err_locked;
153 
154         /*
155          * When source of clock is internal or any PCM stream are running,
156          * the available sampling rate is limited at current sampling rate.
157          */
158         if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL ||
159             amdtp_stream_pcm_running(&bebob->tx_stream) ||
160             amdtp_stream_pcm_running(&bebob->rx_stream)) {
161                 err = spec->get(bebob, &sampling_rate);
162                 if (err < 0) {
163                         dev_err(&bebob->unit->device,
164                                 "fail to get sampling rate: %d\n", err);
165                         goto err_locked;
166                 }
167 
168                 substream->runtime->hw.rate_min = sampling_rate;
169                 substream->runtime->hw.rate_max = sampling_rate;
170         }
171 
172         snd_pcm_set_sync(substream);
173 end:
174         return err;
175 err_locked:
176         snd_bebob_stream_lock_release(bebob);
177         return err;
178 }
179 
180 static int
181 pcm_close(struct snd_pcm_substream *substream)
182 {
183         struct snd_bebob *bebob = substream->private_data;
184         snd_bebob_stream_lock_release(bebob);
185         return 0;
186 }
187 
188 static int
189 pcm_capture_hw_params(struct snd_pcm_substream *substream,
190                       struct snd_pcm_hw_params *hw_params)
191 {
192         struct snd_bebob *bebob = substream->private_data;
193         int err;
194 
195         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
196                                                params_buffer_bytes(hw_params));
197         if (err < 0)
198                 return err;
199 
200         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
201                 mutex_lock(&bebob->mutex);
202                 bebob->substreams_counter++;
203                 mutex_unlock(&bebob->mutex);
204         }
205 
206         return 0;
207 }
208 static int
209 pcm_playback_hw_params(struct snd_pcm_substream *substream,
210                        struct snd_pcm_hw_params *hw_params)
211 {
212         struct snd_bebob *bebob = substream->private_data;
213         int err;
214 
215         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
216                                                params_buffer_bytes(hw_params));
217         if (err < 0)
218                 return err;
219 
220         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
221                 mutex_lock(&bebob->mutex);
222                 bebob->substreams_counter++;
223                 mutex_unlock(&bebob->mutex);
224         }
225 
226         return 0;
227 }
228 
229 static int
230 pcm_capture_hw_free(struct snd_pcm_substream *substream)
231 {
232         struct snd_bebob *bebob = substream->private_data;
233 
234         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
235                 mutex_lock(&bebob->mutex);
236                 bebob->substreams_counter--;
237                 mutex_unlock(&bebob->mutex);
238         }
239 
240         snd_bebob_stream_stop_duplex(bebob);
241 
242         return snd_pcm_lib_free_vmalloc_buffer(substream);
243 }
244 static int
245 pcm_playback_hw_free(struct snd_pcm_substream *substream)
246 {
247         struct snd_bebob *bebob = substream->private_data;
248 
249         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
250                 mutex_lock(&bebob->mutex);
251                 bebob->substreams_counter--;
252                 mutex_unlock(&bebob->mutex);
253         }
254 
255         snd_bebob_stream_stop_duplex(bebob);
256 
257         return snd_pcm_lib_free_vmalloc_buffer(substream);
258 }
259 
260 static int
261 pcm_capture_prepare(struct snd_pcm_substream *substream)
262 {
263         struct snd_bebob *bebob = substream->private_data;
264         struct snd_pcm_runtime *runtime = substream->runtime;
265         int err;
266 
267         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
268         if (err >= 0)
269                 amdtp_stream_pcm_prepare(&bebob->tx_stream);
270 
271         return err;
272 }
273 static int
274 pcm_playback_prepare(struct snd_pcm_substream *substream)
275 {
276         struct snd_bebob *bebob = substream->private_data;
277         struct snd_pcm_runtime *runtime = substream->runtime;
278         int err;
279 
280         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
281         if (err >= 0)
282                 amdtp_stream_pcm_prepare(&bebob->rx_stream);
283 
284         return err;
285 }
286 
287 static int
288 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
289 {
290         struct snd_bebob *bebob = substream->private_data;
291 
292         switch (cmd) {
293         case SNDRV_PCM_TRIGGER_START:
294                 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream);
295                 break;
296         case SNDRV_PCM_TRIGGER_STOP:
297                 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL);
298                 break;
299         default:
300                 return -EINVAL;
301         }
302 
303         return 0;
304 }
305 static int
306 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
307 {
308         struct snd_bebob *bebob = substream->private_data;
309 
310         switch (cmd) {
311         case SNDRV_PCM_TRIGGER_START:
312                 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream);
313                 break;
314         case SNDRV_PCM_TRIGGER_STOP:
315                 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL);
316                 break;
317         default:
318                 return -EINVAL;
319         }
320 
321         return 0;
322 }
323 
324 static snd_pcm_uframes_t
325 pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
326 {
327         struct snd_bebob *bebob = sbstrm->private_data;
328         return amdtp_stream_pcm_pointer(&bebob->tx_stream);
329 }
330 static snd_pcm_uframes_t
331 pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
332 {
333         struct snd_bebob *bebob = sbstrm->private_data;
334         return amdtp_stream_pcm_pointer(&bebob->rx_stream);
335 }
336 
337 static int pcm_capture_ack(struct snd_pcm_substream *substream)
338 {
339         struct snd_bebob *bebob = substream->private_data;
340 
341         return amdtp_stream_pcm_ack(&bebob->tx_stream);
342 }
343 
344 static int pcm_playback_ack(struct snd_pcm_substream *substream)
345 {
346         struct snd_bebob *bebob = substream->private_data;
347 
348         return amdtp_stream_pcm_ack(&bebob->rx_stream);
349 }
350 
351 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
352 {
353         static const struct snd_pcm_ops capture_ops = {
354                 .open           = pcm_open,
355                 .close          = pcm_close,
356                 .ioctl          = snd_pcm_lib_ioctl,
357                 .hw_params      = pcm_capture_hw_params,
358                 .hw_free        = pcm_capture_hw_free,
359                 .prepare        = pcm_capture_prepare,
360                 .trigger        = pcm_capture_trigger,
361                 .pointer        = pcm_capture_pointer,
362                 .ack            = pcm_capture_ack,
363                 .page           = snd_pcm_lib_get_vmalloc_page,
364         };
365         static const struct snd_pcm_ops playback_ops = {
366                 .open           = pcm_open,
367                 .close          = pcm_close,
368                 .ioctl          = snd_pcm_lib_ioctl,
369                 .hw_params      = pcm_playback_hw_params,
370                 .hw_free        = pcm_playback_hw_free,
371                 .prepare        = pcm_playback_prepare,
372                 .trigger        = pcm_playback_trigger,
373                 .pointer        = pcm_playback_pointer,
374                 .ack            = pcm_playback_ack,
375                 .page           = snd_pcm_lib_get_vmalloc_page,
376         };
377         struct snd_pcm *pcm;
378         int err;
379 
380         err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
381         if (err < 0)
382                 goto end;
383 
384         pcm->private_data = bebob;
385         snprintf(pcm->name, sizeof(pcm->name),
386                  "%s PCM", bebob->card->shortname);
387         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
388         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
389 end:
390         return err;
391 }
392 

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