1 /* 2 * soc-compress.c -- ALSA SoC Compress 3 * 4 * Copyright (C) 2012 Intel Corp. 5 * 6 * Authors: Namarta Kohli <namartax.kohli@intel.com> 7 * Ramesh Babu K V <ramesh.babu@linux.intel.com> 8 * Vinod Koul <vinod.koul@linux.intel.com> 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the 12 * Free Software Foundation; either version 2 of the License, or (at your 13 * option) any later version. 14 * 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/init.h> 19 #include <linux/delay.h> 20 #include <linux/slab.h> 21 #include <linux/workqueue.h> 22 #include <sound/core.h> 23 #include <sound/compress_params.h> 24 #include <sound/compress_driver.h> 25 #include <sound/soc.h> 26 #include <sound/initval.h> 27 28 static int soc_compr_open(struct snd_compr_stream *cstream) 29 { 30 struct snd_soc_pcm_runtime *rtd = cstream->private_data; 31 struct snd_soc_platform *platform = rtd->platform; 32 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 33 struct snd_soc_dai *codec_dai = rtd->codec_dai; 34 int ret = 0; 35 36 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 37 38 if (platform->driver->compr_ops && platform->driver->compr_ops->open) { 39 ret = platform->driver->compr_ops->open(cstream); 40 if (ret < 0) { 41 pr_err("compress asoc: can't open platform %s\n", platform->name); 42 goto out; 43 } 44 } 45 46 if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->startup) { 47 ret = rtd->dai_link->compr_ops->startup(cstream); 48 if (ret < 0) { 49 pr_err("compress asoc: %s startup failed\n", rtd->dai_link->name); 50 goto machine_err; 51 } 52 } 53 54 if (cstream->direction == SND_COMPRESS_PLAYBACK) { 55 cpu_dai->playback_active++; 56 codec_dai->playback_active++; 57 } else { 58 cpu_dai->capture_active++; 59 codec_dai->capture_active++; 60 } 61 62 cpu_dai->active++; 63 codec_dai->active++; 64 rtd->codec->active++; 65 66 mutex_unlock(&rtd->pcm_mutex); 67 68 return 0; 69 70 machine_err: 71 if (platform->driver->compr_ops && platform->driver->compr_ops->free) 72 platform->driver->compr_ops->free(cstream); 73 out: 74 mutex_unlock(&rtd->pcm_mutex); 75 return ret; 76 } 77 78 /* 79 * Power down the audio subsystem pmdown_time msecs after close is called. 80 * This is to ensure there are no pops or clicks in between any music tracks 81 * due to DAPM power cycling. 82 */ 83 static void close_delayed_work(struct work_struct *work) 84 { 85 struct snd_soc_pcm_runtime *rtd = 86 container_of(work, struct snd_soc_pcm_runtime, delayed_work.work); 87 struct snd_soc_dai *codec_dai = rtd->codec_dai; 88 89 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 90 91 dev_dbg(rtd->dev, "ASoC: pop wq checking: %s status: %s waiting: %s\n", 92 codec_dai->driver->playback.stream_name, 93 codec_dai->playback_active ? "active" : "inactive", 94 rtd->pop_wait ? "yes" : "no"); 95 96 /* are we waiting on this codec DAI stream */ 97 if (rtd->pop_wait == 1) { 98 rtd->pop_wait = 0; 99 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK, 100 SND_SOC_DAPM_STREAM_STOP); 101 } 102 103 mutex_unlock(&rtd->pcm_mutex); 104 } 105 106 static int soc_compr_free(struct snd_compr_stream *cstream) 107 { 108 struct snd_soc_pcm_runtime *rtd = cstream->private_data; 109 struct snd_soc_platform *platform = rtd->platform; 110 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 111 struct snd_soc_dai *codec_dai = rtd->codec_dai; 112 struct snd_soc_codec *codec = rtd->codec; 113 114 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 115 116 if (cstream->direction == SND_COMPRESS_PLAYBACK) { 117 cpu_dai->playback_active--; 118 codec_dai->playback_active--; 119 } else { 120 cpu_dai->capture_active--; 121 codec_dai->capture_active--; 122 } 123 124 snd_soc_dai_digital_mute(codec_dai, 1, cstream->direction); 125 126 cpu_dai->active--; 127 codec_dai->active--; 128 codec->active--; 129 130 if (!cpu_dai->active) 131 cpu_dai->rate = 0; 132 133 if (!codec_dai->active) 134 codec_dai->rate = 0; 135 136 137 if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->shutdown) 138 rtd->dai_link->compr_ops->shutdown(cstream); 139 140 if (platform->driver->compr_ops && platform->driver->compr_ops->free) 141 platform->driver->compr_ops->free(cstream); 142 cpu_dai->runtime = NULL; 143 144 if (cstream->direction == SND_COMPRESS_PLAYBACK) { 145 if (!rtd->pmdown_time || codec->ignore_pmdown_time || 146 rtd->dai_link->ignore_pmdown_time) { 147 snd_soc_dapm_stream_event(rtd, 148 SNDRV_PCM_STREAM_PLAYBACK, 149 SND_SOC_DAPM_STREAM_STOP); 150 } else { 151 rtd->pop_wait = 1; 152 schedule_delayed_work(&rtd->delayed_work, 153 msecs_to_jiffies(rtd->pmdown_time)); 154 } 155 } else { 156 /* capture streams can be powered down now */ 157 snd_soc_dapm_stream_event(rtd, 158 SNDRV_PCM_STREAM_CAPTURE, 159 SND_SOC_DAPM_STREAM_STOP); 160 } 161 162 mutex_unlock(&rtd->pcm_mutex); 163 return 0; 164 } 165 166 static int soc_compr_trigger(struct snd_compr_stream *cstream, int cmd) 167 { 168 169 struct snd_soc_pcm_runtime *rtd = cstream->private_data; 170 struct snd_soc_platform *platform = rtd->platform; 171 struct snd_soc_dai *codec_dai = rtd->codec_dai; 172 int ret = 0; 173 174 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 175 176 if (platform->driver->compr_ops && platform->driver->compr_ops->trigger) { 177 ret = platform->driver->compr_ops->trigger(cstream, cmd); 178 if (ret < 0) 179 goto out; 180 } 181 182 switch (cmd) { 183 case SNDRV_PCM_TRIGGER_START: 184 snd_soc_dai_digital_mute(codec_dai, 0, cstream->direction); 185 break; 186 case SNDRV_PCM_TRIGGER_STOP: 187 snd_soc_dai_digital_mute(codec_dai, 1, cstream->direction); 188 break; 189 } 190 191 out: 192 mutex_unlock(&rtd->pcm_mutex); 193 return ret; 194 } 195 196 static int soc_compr_set_params(struct snd_compr_stream *cstream, 197 struct snd_compr_params *params) 198 { 199 struct snd_soc_pcm_runtime *rtd = cstream->private_data; 200 struct snd_soc_platform *platform = rtd->platform; 201 int ret = 0; 202 203 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 204 205 /* first we call set_params for the platform driver 206 * this should configure the soc side 207 * if the machine has compressed ops then we call that as well 208 * expectation is that platform and machine will configure everything 209 * for this compress path, like configuring pcm port for codec 210 */ 211 if (platform->driver->compr_ops && platform->driver->compr_ops->set_params) { 212 ret = platform->driver->compr_ops->set_params(cstream, params); 213 if (ret < 0) 214 goto out; 215 } 216 217 if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->set_params) { 218 ret = rtd->dai_link->compr_ops->set_params(cstream); 219 if (ret < 0) 220 goto out; 221 } 222 223 snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_PLAYBACK, 224 SND_SOC_DAPM_STREAM_START); 225 226 out: 227 mutex_unlock(&rtd->pcm_mutex); 228 return ret; 229 } 230 231 static int soc_compr_get_params(struct snd_compr_stream *cstream, 232 struct snd_codec *params) 233 { 234 struct snd_soc_pcm_runtime *rtd = cstream->private_data; 235 struct snd_soc_platform *platform = rtd->platform; 236 int ret = 0; 237 238 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 239 240 if (platform->driver->compr_ops && platform->driver->compr_ops->get_params) 241 ret = platform->driver->compr_ops->get_params(cstream, params); 242 243 mutex_unlock(&rtd->pcm_mutex); 244 return ret; 245 } 246 247 static int soc_compr_get_caps(struct snd_compr_stream *cstream, 248 struct snd_compr_caps *caps) 249 { 250 struct snd_soc_pcm_runtime *rtd = cstream->private_data; 251 struct snd_soc_platform *platform = rtd->platform; 252 int ret = 0; 253 254 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 255 256 if (platform->driver->compr_ops && platform->driver->compr_ops->get_caps) 257 ret = platform->driver->compr_ops->get_caps(cstream, caps); 258 259 mutex_unlock(&rtd->pcm_mutex); 260 return ret; 261 } 262 263 static int soc_compr_get_codec_caps(struct snd_compr_stream *cstream, 264 struct snd_compr_codec_caps *codec) 265 { 266 struct snd_soc_pcm_runtime *rtd = cstream->private_data; 267 struct snd_soc_platform *platform = rtd->platform; 268 int ret = 0; 269 270 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 271 272 if (platform->driver->compr_ops && platform->driver->compr_ops->get_codec_caps) 273 ret = platform->driver->compr_ops->get_codec_caps(cstream, codec); 274 275 mutex_unlock(&rtd->pcm_mutex); 276 return ret; 277 } 278 279 static int soc_compr_ack(struct snd_compr_stream *cstream, size_t bytes) 280 { 281 struct snd_soc_pcm_runtime *rtd = cstream->private_data; 282 struct snd_soc_platform *platform = rtd->platform; 283 int ret = 0; 284 285 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 286 287 if (platform->driver->compr_ops && platform->driver->compr_ops->ack) 288 ret = platform->driver->compr_ops->ack(cstream, bytes); 289 290 mutex_unlock(&rtd->pcm_mutex); 291 return ret; 292 } 293 294 static int soc_compr_pointer(struct snd_compr_stream *cstream, 295 struct snd_compr_tstamp *tstamp) 296 { 297 struct snd_soc_pcm_runtime *rtd = cstream->private_data; 298 struct snd_soc_platform *platform = rtd->platform; 299 300 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 301 302 if (platform->driver->compr_ops && platform->driver->compr_ops->pointer) 303 platform->driver->compr_ops->pointer(cstream, tstamp); 304 305 mutex_unlock(&rtd->pcm_mutex); 306 return 0; 307 } 308 309 static int soc_compr_copy(struct snd_compr_stream *cstream, 310 const char __user *buf, size_t count) 311 { 312 struct snd_soc_pcm_runtime *rtd = cstream->private_data; 313 struct snd_soc_platform *platform = rtd->platform; 314 int ret = 0; 315 316 mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); 317 318 if (platform->driver->compr_ops && platform->driver->compr_ops->copy) 319 ret = platform->driver->compr_ops->copy(cstream, buf, count); 320 321 mutex_unlock(&rtd->pcm_mutex); 322 return ret; 323 } 324 325 /* ASoC Compress operations */ 326 static struct snd_compr_ops soc_compr_ops = { 327 .open = soc_compr_open, 328 .free = soc_compr_free, 329 .set_params = soc_compr_set_params, 330 .get_params = soc_compr_get_params, 331 .trigger = soc_compr_trigger, 332 .pointer = soc_compr_pointer, 333 .ack = soc_compr_ack, 334 .get_caps = soc_compr_get_caps, 335 .get_codec_caps = soc_compr_get_codec_caps 336 }; 337 338 /* create a new compress */ 339 int soc_new_compress(struct snd_soc_pcm_runtime *rtd, int num) 340 { 341 struct snd_soc_codec *codec = rtd->codec; 342 struct snd_soc_platform *platform = rtd->platform; 343 struct snd_soc_dai *codec_dai = rtd->codec_dai; 344 struct snd_soc_dai *cpu_dai = rtd->cpu_dai; 345 struct snd_compr *compr; 346 char new_name[64]; 347 int ret = 0, direction = 0; 348 349 /* check client and interface hw capabilities */ 350 snprintf(new_name, sizeof(new_name), "%s %s-%d", 351 rtd->dai_link->stream_name, codec_dai->name, num); 352 direction = SND_COMPRESS_PLAYBACK; 353 compr = kzalloc(sizeof(*compr), GFP_KERNEL); 354 if (compr == NULL) { 355 snd_printk(KERN_ERR "Cannot allocate compr\n"); 356 return -ENOMEM; 357 } 358 359 compr->ops = devm_kzalloc(rtd->card->dev, sizeof(soc_compr_ops), 360 GFP_KERNEL); 361 if (compr->ops == NULL) { 362 dev_err(rtd->card->dev, "Cannot allocate compressed ops\n"); 363 ret = -ENOMEM; 364 goto compr_err; 365 } 366 memcpy(compr->ops, &soc_compr_ops, sizeof(soc_compr_ops)); 367 368 /* Add copy callback for not memory mapped DSPs */ 369 if (platform->driver->compr_ops && platform->driver->compr_ops->copy) 370 compr->ops->copy = soc_compr_copy; 371 372 mutex_init(&compr->lock); 373 ret = snd_compress_new(rtd->card->snd_card, num, direction, compr); 374 if (ret < 0) { 375 pr_err("compress asoc: can't create compress for codec %s\n", 376 codec->name); 377 goto compr_err; 378 } 379 380 /* DAPM dai link stream work */ 381 INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work); 382 383 rtd->compr = compr; 384 compr->private_data = rtd; 385 386 printk(KERN_INFO "compress asoc: %s <-> %s mapping ok\n", codec_dai->name, 387 cpu_dai->name); 388 return ret; 389 390 compr_err: 391 kfree(compr); 392 return ret; 393 } 394