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 pcm_hw_params(struct snd_pcm_substream *substream, 189 struct snd_pcm_hw_params *hw_params) 190 { 191 struct snd_bebob *bebob = substream->private_data; 192 int err; 193 194 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 195 params_buffer_bytes(hw_params)); 196 if (err < 0) 197 return err; 198 199 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 200 unsigned int rate = params_rate(hw_params); 201 202 mutex_lock(&bebob->mutex); 203 err = snd_bebob_stream_reserve_duplex(bebob, rate); 204 if (err >= 0) 205 ++bebob->substreams_counter; 206 mutex_unlock(&bebob->mutex); 207 } 208 209 return err; 210 } 211 212 static int pcm_hw_free(struct snd_pcm_substream *substream) 213 { 214 struct snd_bebob *bebob = substream->private_data; 215 216 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) { 217 mutex_lock(&bebob->mutex); 218 bebob->substreams_counter--; 219 mutex_unlock(&bebob->mutex); 220 } 221 222 snd_bebob_stream_stop_duplex(bebob); 223 224 return snd_pcm_lib_free_vmalloc_buffer(substream); 225 } 226 227 static int 228 pcm_capture_prepare(struct snd_pcm_substream *substream) 229 { 230 struct snd_bebob *bebob = substream->private_data; 231 int err; 232 233 err = snd_bebob_stream_start_duplex(bebob); 234 if (err >= 0) 235 amdtp_stream_pcm_prepare(&bebob->tx_stream); 236 237 return err; 238 } 239 static int 240 pcm_playback_prepare(struct snd_pcm_substream *substream) 241 { 242 struct snd_bebob *bebob = substream->private_data; 243 int err; 244 245 err = snd_bebob_stream_start_duplex(bebob); 246 if (err >= 0) 247 amdtp_stream_pcm_prepare(&bebob->rx_stream); 248 249 return err; 250 } 251 252 static int 253 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) 254 { 255 struct snd_bebob *bebob = substream->private_data; 256 257 switch (cmd) { 258 case SNDRV_PCM_TRIGGER_START: 259 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream); 260 break; 261 case SNDRV_PCM_TRIGGER_STOP: 262 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL); 263 break; 264 default: 265 return -EINVAL; 266 } 267 268 return 0; 269 } 270 static int 271 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) 272 { 273 struct snd_bebob *bebob = substream->private_data; 274 275 switch (cmd) { 276 case SNDRV_PCM_TRIGGER_START: 277 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream); 278 break; 279 case SNDRV_PCM_TRIGGER_STOP: 280 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL); 281 break; 282 default: 283 return -EINVAL; 284 } 285 286 return 0; 287 } 288 289 static snd_pcm_uframes_t 290 pcm_capture_pointer(struct snd_pcm_substream *sbstrm) 291 { 292 struct snd_bebob *bebob = sbstrm->private_data; 293 return amdtp_stream_pcm_pointer(&bebob->tx_stream); 294 } 295 static snd_pcm_uframes_t 296 pcm_playback_pointer(struct snd_pcm_substream *sbstrm) 297 { 298 struct snd_bebob *bebob = sbstrm->private_data; 299 return amdtp_stream_pcm_pointer(&bebob->rx_stream); 300 } 301 302 static int pcm_capture_ack(struct snd_pcm_substream *substream) 303 { 304 struct snd_bebob *bebob = substream->private_data; 305 306 return amdtp_stream_pcm_ack(&bebob->tx_stream); 307 } 308 309 static int pcm_playback_ack(struct snd_pcm_substream *substream) 310 { 311 struct snd_bebob *bebob = substream->private_data; 312 313 return amdtp_stream_pcm_ack(&bebob->rx_stream); 314 } 315 316 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob) 317 { 318 static const struct snd_pcm_ops capture_ops = { 319 .open = pcm_open, 320 .close = pcm_close, 321 .ioctl = snd_pcm_lib_ioctl, 322 .hw_params = pcm_hw_params, 323 .hw_free = pcm_hw_free, 324 .prepare = pcm_capture_prepare, 325 .trigger = pcm_capture_trigger, 326 .pointer = pcm_capture_pointer, 327 .ack = pcm_capture_ack, 328 .page = snd_pcm_lib_get_vmalloc_page, 329 }; 330 static const struct snd_pcm_ops playback_ops = { 331 .open = pcm_open, 332 .close = pcm_close, 333 .ioctl = snd_pcm_lib_ioctl, 334 .hw_params = pcm_hw_params, 335 .hw_free = pcm_hw_free, 336 .prepare = pcm_playback_prepare, 337 .trigger = pcm_playback_trigger, 338 .pointer = pcm_playback_pointer, 339 .ack = pcm_playback_ack, 340 .page = snd_pcm_lib_get_vmalloc_page, 341 }; 342 struct snd_pcm *pcm; 343 int err; 344 345 err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm); 346 if (err < 0) 347 goto end; 348 349 pcm->private_data = bebob; 350 snprintf(pcm->name, sizeof(pcm->name), 351 "%s PCM", bebob->card->shortname); 352 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops); 353 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops); 354 end: 355 return err; 356 } 357