1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * bebob_pcm.c - a part of driver for BeBoB based devices 4 * 5 * Copyright (c) 2013-2014 Takashi Sakamoto 6 */ 7 8 #include "./bebob.h" 9 10 static int 11 hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) 12 { 13 struct snd_bebob_stream_formation *formations = rule->private; 14 struct snd_interval *r = 15 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 16 const struct snd_interval *c = 17 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 18 struct snd_interval t = { 19 .min = UINT_MAX, .max = 0, .integer = 1 20 }; 21 unsigned int i; 22 23 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { 24 /* entry is invalid */ 25 if (formations[i].pcm == 0) 26 continue; 27 28 if (!snd_interval_test(c, formations[i].pcm)) 29 continue; 30 31 t.min = min(t.min, snd_bebob_rate_table[i]); 32 t.max = max(t.max, snd_bebob_rate_table[i]); 33 34 } 35 return snd_interval_refine(r, &t); 36 } 37 38 static int 39 hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) 40 { 41 struct snd_bebob_stream_formation *formations = rule->private; 42 struct snd_interval *c = 43 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 44 const struct snd_interval *r = 45 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 46 struct snd_interval t = { 47 .min = UINT_MAX, .max = 0, .integer = 1 48 }; 49 50 unsigned int i; 51 52 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { 53 /* entry is invalid */ 54 if (formations[i].pcm == 0) 55 continue; 56 57 if (!snd_interval_test(r, snd_bebob_rate_table[i])) 58 continue; 59 60 t.min = min(t.min, formations[i].pcm); 61 t.max = max(t.max, formations[i].pcm); 62 } 63 64 return snd_interval_refine(c, &t); 65 } 66 67 static void 68 limit_channels_and_rates(struct snd_pcm_hardware *hw, 69 struct snd_bebob_stream_formation *formations) 70 { 71 unsigned int i; 72 73 hw->channels_min = UINT_MAX; 74 hw->channels_max = 0; 75 76 hw->rate_min = UINT_MAX; 77 hw->rate_max = 0; 78 hw->rates = 0; 79 80 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { 81 /* entry has no PCM channels */ 82 if (formations[i].pcm == 0) 83 continue; 84 85 hw->channels_min = min(hw->channels_min, formations[i].pcm); 86 hw->channels_max = max(hw->channels_max, formations[i].pcm); 87 88 hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]); 89 hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]); 90 hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]); 91 } 92 } 93 94 static int 95 pcm_init_hw_params(struct snd_bebob *bebob, 96 struct snd_pcm_substream *substream) 97 { 98 struct snd_pcm_runtime *runtime = substream->runtime; 99 struct amdtp_stream *s; 100 struct snd_bebob_stream_formation *formations; 101 int err; 102 103 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 104 runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS; 105 s = &bebob->tx_stream; 106 formations = bebob->tx_stream_formations; 107 } else { 108 runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS; 109 s = &bebob->rx_stream; 110 formations = bebob->rx_stream_formations; 111 } 112 113 limit_channels_and_rates(&runtime->hw, formations); 114 115 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 116 hw_rule_channels, formations, 117 SNDRV_PCM_HW_PARAM_RATE, -1); 118 if (err < 0) 119 goto end; 120 121 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 122 hw_rule_rate, formations, 123 SNDRV_PCM_HW_PARAM_CHANNELS, -1); 124 if (err < 0) 125 goto end; 126 127 err = amdtp_am824_add_pcm_hw_constraints(s, runtime); 128 end: 129 return err; 130 } 131 132 static int 133 pcm_open(struct snd_pcm_substream *substream) 134 { 135 struct snd_bebob *bebob = substream->private_data; 136 const struct snd_bebob_rate_spec *spec = bebob->spec->rate; 137 unsigned int sampling_rate; 138 enum snd_bebob_clock_type src; 139 int err; 140 141 err = snd_bebob_stream_lock_try(bebob); 142 if (err < 0) 143 goto end; 144 145 err = pcm_init_hw_params(bebob, substream); 146 if (err < 0) 147 goto err_locked; 148 149 err = snd_bebob_stream_get_clock_src(bebob, &src); 150 if (err < 0) 151 goto err_locked; 152 153 /* 154 * When source of clock is internal or any PCM stream are running, 155 * the available sampling rate is limited at current sampling rate. 156 */ 157 if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL || 158 amdtp_stream_pcm_running(&bebob->tx_stream) || 159 amdtp_stream_pcm_running(&bebob->rx_stream)) { 160 err = spec->get(bebob, &sampling_rate); 161 if (err < 0) { 162 dev_err(&bebob->unit->device, 163 "fail to get sampling rate: %d\n", err); 164 goto err_locked; 165 } 166 167 substream->runtime->hw.rate_min = sampling_rate; 168 substream->runtime->hw.rate_max = sampling_rate; 169 } 170 171 snd_pcm_set_sync(substream); 172 end: 173 return err; 174 err_locked: 175 snd_bebob_stream_lock_release(bebob); 176 return err; 177 } 178 179 static int 180 pcm_close(struct snd_pcm_substream *substream) 181 { 182 struct snd_bebob *bebob = substream->private_data; 183 snd_bebob_stream_lock_release(bebob); 184 return 0; 185 } 186 187 static int pcm_hw_params(struct snd_pcm_substream *substream, 188 struct snd_pcm_hw_params *hw_params) 189 { 190 struct snd_bebob *bebob = substream->private_data; 191 int err; 192 193 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 194 params_buffer_bytes(hw_params)); 195 if (err < 0) 196 return err; 197 198 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 199 unsigned int rate = params_rate(hw_params); 200 201 mutex_lock(&bebob->mutex); 202 err = snd_bebob_stream_reserve_duplex(bebob, rate); 203 if (err >= 0) 204 ++bebob->substreams_counter; 205 mutex_unlock(&bebob->mutex); 206 } 207 208 return err; 209 } 210 211 static int pcm_hw_free(struct snd_pcm_substream *substream) 212 { 213 struct snd_bebob *bebob = substream->private_data; 214 215 mutex_lock(&bebob->mutex); 216 217 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 218 bebob->substreams_counter--; 219 220 snd_bebob_stream_stop_duplex(bebob); 221 222 mutex_unlock(&bebob->mutex); 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