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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 void
 96 limit_period_and_buffer(struct snd_pcm_hardware *hw)
 97 {
 98         hw->periods_min = 2;            /* SNDRV_PCM_INFO_BATCH */
 99         hw->periods_max = UINT_MAX;
100 
101         hw->period_bytes_min = 4 * hw->channels_max;    /* bytes for a frame */
102 
103         /* Just to prevent from allocating much pages. */
104         hw->period_bytes_max = hw->period_bytes_min * 2048;
105         hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
106 }
107 
108 static int
109 pcm_init_hw_params(struct snd_bebob *bebob,
110                    struct snd_pcm_substream *substream)
111 {
112         struct snd_pcm_runtime *runtime = substream->runtime;
113         struct amdtp_stream *s;
114         struct snd_bebob_stream_formation *formations;
115         int err;
116 
117         runtime->hw.info = SNDRV_PCM_INFO_BATCH |
118                            SNDRV_PCM_INFO_BLOCK_TRANSFER |
119                            SNDRV_PCM_INFO_INTERLEAVED |
120                            SNDRV_PCM_INFO_JOINT_DUPLEX |
121                            SNDRV_PCM_INFO_MMAP |
122                            SNDRV_PCM_INFO_MMAP_VALID;
123 
124         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
125                 runtime->hw.formats = AMDTP_IN_PCM_FORMAT_BITS;
126                 s = &bebob->tx_stream;
127                 formations = bebob->tx_stream_formations;
128         } else {
129                 runtime->hw.formats = AMDTP_OUT_PCM_FORMAT_BITS;
130                 s = &bebob->rx_stream;
131                 formations = bebob->rx_stream_formations;
132         }
133 
134         limit_channels_and_rates(&runtime->hw, formations);
135         limit_period_and_buffer(&runtime->hw);
136 
137         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
138                                   hw_rule_channels, formations,
139                                   SNDRV_PCM_HW_PARAM_RATE, -1);
140         if (err < 0)
141                 goto end;
142 
143         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
144                                   hw_rule_rate, formations,
145                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
146         if (err < 0)
147                 goto end;
148 
149         err = amdtp_stream_add_pcm_hw_constraints(s, runtime);
150 end:
151         return err;
152 }
153 
154 static int
155 pcm_open(struct snd_pcm_substream *substream)
156 {
157         struct snd_bebob *bebob = substream->private_data;
158         struct snd_bebob_rate_spec *spec = bebob->spec->rate;
159         unsigned int sampling_rate;
160         bool internal;
161         int err;
162 
163         err = snd_bebob_stream_lock_try(bebob);
164         if (err < 0)
165                 goto end;
166 
167         err = pcm_init_hw_params(bebob, substream);
168         if (err < 0)
169                 goto err_locked;
170 
171         err = snd_bebob_stream_check_internal_clock(bebob, &internal);
172         if (err < 0)
173                 goto err_locked;
174 
175         /*
176          * When source of clock is internal or any PCM stream are running,
177          * the available sampling rate is limited at current sampling rate.
178          */
179         if (!internal ||
180             amdtp_stream_pcm_running(&bebob->tx_stream) ||
181             amdtp_stream_pcm_running(&bebob->rx_stream)) {
182                 err = spec->get(bebob, &sampling_rate);
183                 if (err < 0) {
184                         dev_err(&bebob->unit->device,
185                                 "fail to get sampling rate: %d\n", err);
186                         goto err_locked;
187                 }
188 
189                 substream->runtime->hw.rate_min = sampling_rate;
190                 substream->runtime->hw.rate_max = sampling_rate;
191         }
192 
193         snd_pcm_set_sync(substream);
194 end:
195         return err;
196 err_locked:
197         snd_bebob_stream_lock_release(bebob);
198         return err;
199 }
200 
201 static int
202 pcm_close(struct snd_pcm_substream *substream)
203 {
204         struct snd_bebob *bebob = substream->private_data;
205         snd_bebob_stream_lock_release(bebob);
206         return 0;
207 }
208 
209 static int
210 pcm_capture_hw_params(struct snd_pcm_substream *substream,
211                       struct snd_pcm_hw_params *hw_params)
212 {
213         struct snd_bebob *bebob = substream->private_data;
214 
215         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
216                 atomic_inc(&bebob->capture_substreams);
217         amdtp_stream_set_pcm_format(&bebob->tx_stream,
218                                     params_format(hw_params));
219         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
220                                                 params_buffer_bytes(hw_params));
221 }
222 static int
223 pcm_playback_hw_params(struct snd_pcm_substream *substream,
224                        struct snd_pcm_hw_params *hw_params)
225 {
226         struct snd_bebob *bebob = substream->private_data;
227 
228         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
229                 atomic_inc(&bebob->playback_substreams);
230         amdtp_stream_set_pcm_format(&bebob->rx_stream,
231                                     params_format(hw_params));
232         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
233                                                 params_buffer_bytes(hw_params));
234 }
235 
236 static int
237 pcm_capture_hw_free(struct snd_pcm_substream *substream)
238 {
239         struct snd_bebob *bebob = substream->private_data;
240 
241         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
242                 atomic_dec(&bebob->capture_substreams);
243 
244         snd_bebob_stream_stop_duplex(bebob);
245 
246         return snd_pcm_lib_free_vmalloc_buffer(substream);
247 }
248 static int
249 pcm_playback_hw_free(struct snd_pcm_substream *substream)
250 {
251         struct snd_bebob *bebob = substream->private_data;
252 
253         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
254                 atomic_dec(&bebob->playback_substreams);
255 
256         snd_bebob_stream_stop_duplex(bebob);
257 
258         return snd_pcm_lib_free_vmalloc_buffer(substream);
259 }
260 
261 static int
262 pcm_capture_prepare(struct snd_pcm_substream *substream)
263 {
264         struct snd_bebob *bebob = substream->private_data;
265         struct snd_pcm_runtime *runtime = substream->runtime;
266         int err;
267 
268         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
269         if (err >= 0)
270                 amdtp_stream_pcm_prepare(&bebob->tx_stream);
271 
272         return err;
273 }
274 static int
275 pcm_playback_prepare(struct snd_pcm_substream *substream)
276 {
277         struct snd_bebob *bebob = substream->private_data;
278         struct snd_pcm_runtime *runtime = substream->runtime;
279         int err;
280 
281         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
282         if (err >= 0)
283                 amdtp_stream_pcm_prepare(&bebob->rx_stream);
284 
285         return err;
286 }
287 
288 static int
289 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
290 {
291         struct snd_bebob *bebob = substream->private_data;
292 
293         switch (cmd) {
294         case SNDRV_PCM_TRIGGER_START:
295                 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream);
296                 break;
297         case SNDRV_PCM_TRIGGER_STOP:
298                 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL);
299                 break;
300         default:
301                 return -EINVAL;
302         }
303 
304         return 0;
305 }
306 static int
307 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
308 {
309         struct snd_bebob *bebob = substream->private_data;
310 
311         switch (cmd) {
312         case SNDRV_PCM_TRIGGER_START:
313                 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream);
314                 break;
315         case SNDRV_PCM_TRIGGER_STOP:
316                 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL);
317                 break;
318         default:
319                 return -EINVAL;
320         }
321 
322         return 0;
323 }
324 
325 static snd_pcm_uframes_t
326 pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
327 {
328         struct snd_bebob *bebob = sbstrm->private_data;
329         return amdtp_stream_pcm_pointer(&bebob->tx_stream);
330 }
331 static snd_pcm_uframes_t
332 pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
333 {
334         struct snd_bebob *bebob = sbstrm->private_data;
335         return amdtp_stream_pcm_pointer(&bebob->rx_stream);
336 }
337 
338 static const struct snd_pcm_ops pcm_capture_ops = {
339         .open           = pcm_open,
340         .close          = pcm_close,
341         .ioctl          = snd_pcm_lib_ioctl,
342         .hw_params      = pcm_capture_hw_params,
343         .hw_free        = pcm_capture_hw_free,
344         .prepare        = pcm_capture_prepare,
345         .trigger        = pcm_capture_trigger,
346         .pointer        = pcm_capture_pointer,
347         .page           = snd_pcm_lib_get_vmalloc_page,
348 };
349 static const struct snd_pcm_ops pcm_playback_ops = {
350         .open           = pcm_open,
351         .close          = pcm_close,
352         .ioctl          = snd_pcm_lib_ioctl,
353         .hw_params      = pcm_playback_hw_params,
354         .hw_free        = pcm_playback_hw_free,
355         .prepare        = pcm_playback_prepare,
356         .trigger        = pcm_playback_trigger,
357         .pointer        = pcm_playback_pointer,
358         .page           = snd_pcm_lib_get_vmalloc_page,
359         .mmap           = snd_pcm_lib_mmap_vmalloc,
360 };
361 
362 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
363 {
364         struct snd_pcm *pcm;
365         int err;
366 
367         err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
368         if (err < 0)
369                 goto end;
370 
371         pcm->private_data = bebob;
372         snprintf(pcm->name, sizeof(pcm->name),
373                  "%s PCM", bebob->card->shortname);
374         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
375         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
376 end:
377         return err;
378 }
379 

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