1597603d6SJaroslav Kysela /* 2597603d6SJaroslav Kysela * Loopback soundcard 3597603d6SJaroslav Kysela * 4597603d6SJaroslav Kysela * Original code: 5597603d6SJaroslav Kysela * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 6597603d6SJaroslav Kysela * 7597603d6SJaroslav Kysela * More accurate positioning and full-duplex support: 8597603d6SJaroslav Kysela * Copyright (c) Ahmet İnan <ainan at mathematik.uni-freiburg.de> 9597603d6SJaroslav Kysela * 10597603d6SJaroslav Kysela * Major (almost complete) rewrite: 11597603d6SJaroslav Kysela * Copyright (c) by Takashi Iwai <tiwai@suse.de> 12597603d6SJaroslav Kysela * 13597603d6SJaroslav Kysela * A next major update in 2010 (separate timers for playback and capture): 14597603d6SJaroslav Kysela * Copyright (c) Jaroslav Kysela <perex@perex.cz> 15597603d6SJaroslav Kysela * 16597603d6SJaroslav Kysela * This program is free software; you can redistribute it and/or modify 17597603d6SJaroslav Kysela * it under the terms of the GNU General Public License as published by 18597603d6SJaroslav Kysela * the Free Software Foundation; either version 2 of the License, or 19597603d6SJaroslav Kysela * (at your option) any later version. 20597603d6SJaroslav Kysela * 21597603d6SJaroslav Kysela * This program is distributed in the hope that it will be useful, 22597603d6SJaroslav Kysela * but WITHOUT ANY WARRANTY; without even the implied warranty of 23597603d6SJaroslav Kysela * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 24597603d6SJaroslav Kysela * GNU General Public License for more details. 25597603d6SJaroslav Kysela * 26597603d6SJaroslav Kysela * You should have received a copy of the GNU General Public License 27597603d6SJaroslav Kysela * along with this program; if not, write to the Free Software 28597603d6SJaroslav Kysela * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 29597603d6SJaroslav Kysela * 30597603d6SJaroslav Kysela */ 31597603d6SJaroslav Kysela 32597603d6SJaroslav Kysela #include <linux/init.h> 33597603d6SJaroslav Kysela #include <linux/jiffies.h> 34597603d6SJaroslav Kysela #include <linux/slab.h> 35597603d6SJaroslav Kysela #include <linux/time.h> 36597603d6SJaroslav Kysela #include <linux/wait.h> 3765a77217SPaul Gortmaker #include <linux/module.h> 38597603d6SJaroslav Kysela #include <linux/platform_device.h> 39597603d6SJaroslav Kysela #include <sound/core.h> 40597603d6SJaroslav Kysela #include <sound/control.h> 41597603d6SJaroslav Kysela #include <sound/pcm.h> 42e74670b6SJaroslav Kysela #include <sound/info.h> 43597603d6SJaroslav Kysela #include <sound/initval.h> 44597603d6SJaroslav Kysela 45597603d6SJaroslav Kysela MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 46597603d6SJaroslav Kysela MODULE_DESCRIPTION("A loopback soundcard"); 47597603d6SJaroslav Kysela MODULE_LICENSE("GPL"); 48597603d6SJaroslav Kysela MODULE_SUPPORTED_DEVICE("{{ALSA,Loopback soundcard}}"); 49597603d6SJaroslav Kysela 50597603d6SJaroslav Kysela #define MAX_PCM_SUBSTREAMS 8 51597603d6SJaroslav Kysela 52597603d6SJaroslav Kysela static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 53597603d6SJaroslav Kysela static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 54a67ff6a5SRusty Russell static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; 55597603d6SJaroslav Kysela static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; 56597603d6SJaroslav Kysela static int pcm_notify[SNDRV_CARDS]; 57597603d6SJaroslav Kysela 58597603d6SJaroslav Kysela module_param_array(index, int, NULL, 0444); 59597603d6SJaroslav Kysela MODULE_PARM_DESC(index, "Index value for loopback soundcard."); 60597603d6SJaroslav Kysela module_param_array(id, charp, NULL, 0444); 61597603d6SJaroslav Kysela MODULE_PARM_DESC(id, "ID string for loopback soundcard."); 62597603d6SJaroslav Kysela module_param_array(enable, bool, NULL, 0444); 63597603d6SJaroslav Kysela MODULE_PARM_DESC(enable, "Enable this loopback soundcard."); 64597603d6SJaroslav Kysela module_param_array(pcm_substreams, int, NULL, 0444); 65597603d6SJaroslav Kysela MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for loopback driver."); 66597603d6SJaroslav Kysela module_param_array(pcm_notify, int, NULL, 0444); 67597603d6SJaroslav Kysela MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels changes."); 68597603d6SJaroslav Kysela 69597603d6SJaroslav Kysela #define NO_PITCH 100000 70597603d6SJaroslav Kysela 71597603d6SJaroslav Kysela struct loopback_pcm; 72597603d6SJaroslav Kysela 73597603d6SJaroslav Kysela struct loopback_cable { 74597603d6SJaroslav Kysela spinlock_t lock; 75597603d6SJaroslav Kysela struct loopback_pcm *streams[2]; 76597603d6SJaroslav Kysela struct snd_pcm_hardware hw; 77597603d6SJaroslav Kysela /* flags */ 78597603d6SJaroslav Kysela unsigned int valid; 79597603d6SJaroslav Kysela unsigned int running; 805de9e45fSJaroslav Kysela unsigned int pause; 81597603d6SJaroslav Kysela }; 82597603d6SJaroslav Kysela 83597603d6SJaroslav Kysela struct loopback_setup { 84597603d6SJaroslav Kysela unsigned int notify: 1; 85597603d6SJaroslav Kysela unsigned int rate_shift; 86597603d6SJaroslav Kysela unsigned int format; 87597603d6SJaroslav Kysela unsigned int rate; 88597603d6SJaroslav Kysela unsigned int channels; 89597603d6SJaroslav Kysela struct snd_ctl_elem_id active_id; 90597603d6SJaroslav Kysela struct snd_ctl_elem_id format_id; 91597603d6SJaroslav Kysela struct snd_ctl_elem_id rate_id; 92597603d6SJaroslav Kysela struct snd_ctl_elem_id channels_id; 93597603d6SJaroslav Kysela }; 94597603d6SJaroslav Kysela 95597603d6SJaroslav Kysela struct loopback { 96597603d6SJaroslav Kysela struct snd_card *card; 97597603d6SJaroslav Kysela struct mutex cable_lock; 98597603d6SJaroslav Kysela struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2]; 99597603d6SJaroslav Kysela struct snd_pcm *pcm[2]; 100597603d6SJaroslav Kysela struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2]; 101597603d6SJaroslav Kysela }; 102597603d6SJaroslav Kysela 103597603d6SJaroslav Kysela struct loopback_pcm { 104597603d6SJaroslav Kysela struct loopback *loopback; 105597603d6SJaroslav Kysela struct snd_pcm_substream *substream; 106597603d6SJaroslav Kysela struct loopback_cable *cable; 107597603d6SJaroslav Kysela unsigned int pcm_buffer_size; 108597603d6SJaroslav Kysela unsigned int buf_pos; /* position in buffer */ 109597603d6SJaroslav Kysela unsigned int silent_size; 110597603d6SJaroslav Kysela /* PCM parameters */ 111597603d6SJaroslav Kysela unsigned int pcm_period_size; 112597603d6SJaroslav Kysela unsigned int pcm_bps; /* bytes per second */ 113597603d6SJaroslav Kysela unsigned int pcm_salign; /* bytes per sample * channels */ 114597603d6SJaroslav Kysela unsigned int pcm_rate_shift; /* rate shift value */ 115597603d6SJaroslav Kysela /* flags */ 116597603d6SJaroslav Kysela unsigned int period_update_pending :1; 117597603d6SJaroslav Kysela /* timer stuff */ 118597603d6SJaroslav Kysela unsigned int irq_pos; /* fractional IRQ position */ 119597603d6SJaroslav Kysela unsigned int period_size_frac; 120b012513cSJaroslav Kysela unsigned int last_drift; 121597603d6SJaroslav Kysela unsigned long last_jiffies; 122597603d6SJaroslav Kysela struct timer_list timer; 123597603d6SJaroslav Kysela }; 124597603d6SJaroslav Kysela 125597603d6SJaroslav Kysela static struct platform_device *devices[SNDRV_CARDS]; 126597603d6SJaroslav Kysela 127597603d6SJaroslav Kysela static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x) 128597603d6SJaroslav Kysela { 129597603d6SJaroslav Kysela if (dpcm->pcm_rate_shift == NO_PITCH) { 130597603d6SJaroslav Kysela x /= HZ; 131597603d6SJaroslav Kysela } else { 132597603d6SJaroslav Kysela x = div_u64(NO_PITCH * (unsigned long long)x, 133597603d6SJaroslav Kysela HZ * (unsigned long long)dpcm->pcm_rate_shift); 134597603d6SJaroslav Kysela } 135597603d6SJaroslav Kysela return x - (x % dpcm->pcm_salign); 136597603d6SJaroslav Kysela } 137597603d6SJaroslav Kysela 138597603d6SJaroslav Kysela static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x) 139597603d6SJaroslav Kysela { 140597603d6SJaroslav Kysela if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */ 141597603d6SJaroslav Kysela return x * HZ; 142597603d6SJaroslav Kysela } else { 143597603d6SJaroslav Kysela x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ, 144597603d6SJaroslav Kysela NO_PITCH); 145597603d6SJaroslav Kysela } 146597603d6SJaroslav Kysela return x; 147597603d6SJaroslav Kysela } 148597603d6SJaroslav Kysela 149597603d6SJaroslav Kysela static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm) 150597603d6SJaroslav Kysela { 151597603d6SJaroslav Kysela int device = dpcm->substream->pstr->pcm->device; 152597603d6SJaroslav Kysela 153597603d6SJaroslav Kysela if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 154597603d6SJaroslav Kysela device ^= 1; 155597603d6SJaroslav Kysela return &dpcm->loopback->setup[dpcm->substream->number][device]; 156597603d6SJaroslav Kysela } 157597603d6SJaroslav Kysela 158597603d6SJaroslav Kysela static inline unsigned int get_notify(struct loopback_pcm *dpcm) 159597603d6SJaroslav Kysela { 160597603d6SJaroslav Kysela return get_setup(dpcm)->notify; 161597603d6SJaroslav Kysela } 162597603d6SJaroslav Kysela 163597603d6SJaroslav Kysela static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm) 164597603d6SJaroslav Kysela { 165597603d6SJaroslav Kysela return get_setup(dpcm)->rate_shift; 166597603d6SJaroslav Kysela } 167597603d6SJaroslav Kysela 168999fc9f6STakashi Iwai /* call in cable->lock */ 169597603d6SJaroslav Kysela static void loopback_timer_start(struct loopback_pcm *dpcm) 170597603d6SJaroslav Kysela { 171597603d6SJaroslav Kysela unsigned long tick; 172597603d6SJaroslav Kysela unsigned int rate_shift = get_rate_shift(dpcm); 173597603d6SJaroslav Kysela 174597603d6SJaroslav Kysela if (rate_shift != dpcm->pcm_rate_shift) { 175597603d6SJaroslav Kysela dpcm->pcm_rate_shift = rate_shift; 176597603d6SJaroslav Kysela dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size); 177597603d6SJaroslav Kysela } 1780db71023SJaroslav Kysela if (dpcm->period_size_frac <= dpcm->irq_pos) { 1790db71023SJaroslav Kysela dpcm->irq_pos %= dpcm->period_size_frac; 1800db71023SJaroslav Kysela dpcm->period_update_pending = 1; 1810db71023SJaroslav Kysela } 182597603d6SJaroslav Kysela tick = dpcm->period_size_frac - dpcm->irq_pos; 183597603d6SJaroslav Kysela tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps; 184597603d6SJaroslav Kysela dpcm->timer.expires = jiffies + tick; 185597603d6SJaroslav Kysela add_timer(&dpcm->timer); 186597603d6SJaroslav Kysela } 187597603d6SJaroslav Kysela 188999fc9f6STakashi Iwai /* call in cable->lock */ 189597603d6SJaroslav Kysela static inline void loopback_timer_stop(struct loopback_pcm *dpcm) 190597603d6SJaroslav Kysela { 191597603d6SJaroslav Kysela del_timer(&dpcm->timer); 192e74670b6SJaroslav Kysela dpcm->timer.expires = 0; 193597603d6SJaroslav Kysela } 194597603d6SJaroslav Kysela 195597603d6SJaroslav Kysela #define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK) 196597603d6SJaroslav Kysela #define CABLE_VALID_CAPTURE (1 << SNDRV_PCM_STREAM_CAPTURE) 197597603d6SJaroslav Kysela #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE) 198597603d6SJaroslav Kysela 199597603d6SJaroslav Kysela static int loopback_check_format(struct loopback_cable *cable, int stream) 200597603d6SJaroslav Kysela { 201b1c73fc8SJaroslav Kysela struct snd_pcm_runtime *runtime, *cruntime; 202597603d6SJaroslav Kysela struct loopback_setup *setup; 203597603d6SJaroslav Kysela struct snd_card *card; 204597603d6SJaroslav Kysela int check; 205597603d6SJaroslav Kysela 206597603d6SJaroslav Kysela if (cable->valid != CABLE_VALID_BOTH) { 207597603d6SJaroslav Kysela if (stream == SNDRV_PCM_STREAM_PLAYBACK) 208597603d6SJaroslav Kysela goto __notify; 209597603d6SJaroslav Kysela return 0; 210597603d6SJaroslav Kysela } 211597603d6SJaroslav Kysela runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> 212597603d6SJaroslav Kysela substream->runtime; 213b1c73fc8SJaroslav Kysela cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> 214b1c73fc8SJaroslav Kysela substream->runtime; 215b1c73fc8SJaroslav Kysela check = runtime->format != cruntime->format || 216b1c73fc8SJaroslav Kysela runtime->rate != cruntime->rate || 217b1c73fc8SJaroslav Kysela runtime->channels != cruntime->channels; 218597603d6SJaroslav Kysela if (!check) 219597603d6SJaroslav Kysela return 0; 220597603d6SJaroslav Kysela if (stream == SNDRV_PCM_STREAM_CAPTURE) { 221597603d6SJaroslav Kysela return -EIO; 222597603d6SJaroslav Kysela } else { 223597603d6SJaroslav Kysela snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> 224597603d6SJaroslav Kysela substream, SNDRV_PCM_STATE_DRAINING); 225597603d6SJaroslav Kysela __notify: 226597603d6SJaroslav Kysela runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> 227597603d6SJaroslav Kysela substream->runtime; 228597603d6SJaroslav Kysela setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]); 229597603d6SJaroslav Kysela card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card; 230597603d6SJaroslav Kysela if (setup->format != runtime->format) { 231597603d6SJaroslav Kysela snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, 232597603d6SJaroslav Kysela &setup->format_id); 233597603d6SJaroslav Kysela setup->format = runtime->format; 234597603d6SJaroslav Kysela } 235597603d6SJaroslav Kysela if (setup->rate != runtime->rate) { 236597603d6SJaroslav Kysela snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, 237597603d6SJaroslav Kysela &setup->rate_id); 238597603d6SJaroslav Kysela setup->rate = runtime->rate; 239597603d6SJaroslav Kysela } 240597603d6SJaroslav Kysela if (setup->channels != runtime->channels) { 241597603d6SJaroslav Kysela snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, 242597603d6SJaroslav Kysela &setup->channels_id); 243597603d6SJaroslav Kysela setup->channels = runtime->channels; 244597603d6SJaroslav Kysela } 245597603d6SJaroslav Kysela } 246597603d6SJaroslav Kysela return 0; 247597603d6SJaroslav Kysela } 248597603d6SJaroslav Kysela 249597603d6SJaroslav Kysela static void loopback_active_notify(struct loopback_pcm *dpcm) 250597603d6SJaroslav Kysela { 251597603d6SJaroslav Kysela snd_ctl_notify(dpcm->loopback->card, 252597603d6SJaroslav Kysela SNDRV_CTL_EVENT_MASK_VALUE, 253597603d6SJaroslav Kysela &get_setup(dpcm)->active_id); 254597603d6SJaroslav Kysela } 255597603d6SJaroslav Kysela 256597603d6SJaroslav Kysela static int loopback_trigger(struct snd_pcm_substream *substream, int cmd) 257597603d6SJaroslav Kysela { 258597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 259597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 260597603d6SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 2615de9e45fSJaroslav Kysela int err, stream = 1 << substream->stream; 262597603d6SJaroslav Kysela 263597603d6SJaroslav Kysela switch (cmd) { 264597603d6SJaroslav Kysela case SNDRV_PCM_TRIGGER_START: 265597603d6SJaroslav Kysela err = loopback_check_format(cable, substream->stream); 266597603d6SJaroslav Kysela if (err < 0) 267597603d6SJaroslav Kysela return err; 268597603d6SJaroslav Kysela dpcm->last_jiffies = jiffies; 269597603d6SJaroslav Kysela dpcm->pcm_rate_shift = 0; 270b012513cSJaroslav Kysela dpcm->last_drift = 0; 271dd04bb12SJaroslav Kysela spin_lock(&cable->lock); 2725de9e45fSJaroslav Kysela cable->running |= stream; 2735de9e45fSJaroslav Kysela cable->pause &= ~stream; 274dd04bb12SJaroslav Kysela loopback_timer_start(dpcm); 275999fc9f6STakashi Iwai spin_unlock(&cable->lock); 276597603d6SJaroslav Kysela if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 277597603d6SJaroslav Kysela loopback_active_notify(dpcm); 278597603d6SJaroslav Kysela break; 279597603d6SJaroslav Kysela case SNDRV_PCM_TRIGGER_STOP: 280dd04bb12SJaroslav Kysela spin_lock(&cable->lock); 2815de9e45fSJaroslav Kysela cable->running &= ~stream; 2825de9e45fSJaroslav Kysela cable->pause &= ~stream; 283597603d6SJaroslav Kysela loopback_timer_stop(dpcm); 284999fc9f6STakashi Iwai spin_unlock(&cable->lock); 285597603d6SJaroslav Kysela if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 286597603d6SJaroslav Kysela loopback_active_notify(dpcm); 287597603d6SJaroslav Kysela break; 2885de9e45fSJaroslav Kysela case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 2895de9e45fSJaroslav Kysela spin_lock(&cable->lock); 2905de9e45fSJaroslav Kysela cable->pause |= stream; 2915de9e45fSJaroslav Kysela loopback_timer_stop(dpcm); 292999fc9f6STakashi Iwai spin_unlock(&cable->lock); 2935de9e45fSJaroslav Kysela break; 2945de9e45fSJaroslav Kysela case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 2955de9e45fSJaroslav Kysela spin_lock(&cable->lock); 2965de9e45fSJaroslav Kysela dpcm->last_jiffies = jiffies; 2975de9e45fSJaroslav Kysela cable->pause &= ~stream; 2985de9e45fSJaroslav Kysela loopback_timer_start(dpcm); 299999fc9f6STakashi Iwai spin_unlock(&cable->lock); 3005de9e45fSJaroslav Kysela break; 301597603d6SJaroslav Kysela default: 302597603d6SJaroslav Kysela return -EINVAL; 303597603d6SJaroslav Kysela } 304597603d6SJaroslav Kysela return 0; 305597603d6SJaroslav Kysela } 306597603d6SJaroslav Kysela 307b1c73fc8SJaroslav Kysela static void params_change_substream(struct loopback_pcm *dpcm, 308b1c73fc8SJaroslav Kysela struct snd_pcm_runtime *runtime) 309b1c73fc8SJaroslav Kysela { 310b1c73fc8SJaroslav Kysela struct snd_pcm_runtime *dst_runtime; 311b1c73fc8SJaroslav Kysela 312b1c73fc8SJaroslav Kysela if (dpcm == NULL || dpcm->substream == NULL) 313b1c73fc8SJaroslav Kysela return; 314b1c73fc8SJaroslav Kysela dst_runtime = dpcm->substream->runtime; 315b1c73fc8SJaroslav Kysela if (dst_runtime == NULL) 316b1c73fc8SJaroslav Kysela return; 317b1c73fc8SJaroslav Kysela dst_runtime->hw = dpcm->cable->hw; 318b1c73fc8SJaroslav Kysela } 319b1c73fc8SJaroslav Kysela 320b1c73fc8SJaroslav Kysela static void params_change(struct snd_pcm_substream *substream) 321b1c73fc8SJaroslav Kysela { 322b1c73fc8SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 323b1c73fc8SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 324b1c73fc8SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 325b1c73fc8SJaroslav Kysela 326b1c73fc8SJaroslav Kysela cable->hw.formats = (1ULL << runtime->format); 327b1c73fc8SJaroslav Kysela cable->hw.rate_min = runtime->rate; 328b1c73fc8SJaroslav Kysela cable->hw.rate_max = runtime->rate; 329b1c73fc8SJaroslav Kysela cable->hw.channels_min = runtime->channels; 330b1c73fc8SJaroslav Kysela cable->hw.channels_max = runtime->channels; 331b1c73fc8SJaroslav Kysela params_change_substream(cable->streams[SNDRV_PCM_STREAM_PLAYBACK], 332b1c73fc8SJaroslav Kysela runtime); 333b1c73fc8SJaroslav Kysela params_change_substream(cable->streams[SNDRV_PCM_STREAM_CAPTURE], 334b1c73fc8SJaroslav Kysela runtime); 335b1c73fc8SJaroslav Kysela } 336b1c73fc8SJaroslav Kysela 337597603d6SJaroslav Kysela static int loopback_prepare(struct snd_pcm_substream *substream) 338597603d6SJaroslav Kysela { 339597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 340597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 341597603d6SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 342b1c73fc8SJaroslav Kysela int bps, salign; 343597603d6SJaroslav Kysela 344597603d6SJaroslav Kysela salign = (snd_pcm_format_width(runtime->format) * 345597603d6SJaroslav Kysela runtime->channels) / 8; 346597603d6SJaroslav Kysela bps = salign * runtime->rate; 347597603d6SJaroslav Kysela if (bps <= 0 || salign <= 0) 348597603d6SJaroslav Kysela return -EINVAL; 349597603d6SJaroslav Kysela 350597603d6SJaroslav Kysela dpcm->buf_pos = 0; 351597603d6SJaroslav Kysela dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size); 352597603d6SJaroslav Kysela if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 353597603d6SJaroslav Kysela /* clear capture buffer */ 354597603d6SJaroslav Kysela dpcm->silent_size = dpcm->pcm_buffer_size; 355597603d6SJaroslav Kysela snd_pcm_format_set_silence(runtime->format, runtime->dma_area, 356597603d6SJaroslav Kysela runtime->buffer_size * runtime->channels); 357597603d6SJaroslav Kysela } 358597603d6SJaroslav Kysela 359597603d6SJaroslav Kysela dpcm->irq_pos = 0; 360597603d6SJaroslav Kysela dpcm->period_update_pending = 0; 361597603d6SJaroslav Kysela dpcm->pcm_bps = bps; 362597603d6SJaroslav Kysela dpcm->pcm_salign = salign; 363597603d6SJaroslav Kysela dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size); 364597603d6SJaroslav Kysela 365597603d6SJaroslav Kysela mutex_lock(&dpcm->loopback->cable_lock); 366b1c73fc8SJaroslav Kysela if (!(cable->valid & ~(1 << substream->stream)) || 367b1c73fc8SJaroslav Kysela (get_setup(dpcm)->notify && 368b1c73fc8SJaroslav Kysela substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) 369b1c73fc8SJaroslav Kysela params_change(substream); 370597603d6SJaroslav Kysela cable->valid |= 1 << substream->stream; 371597603d6SJaroslav Kysela mutex_unlock(&dpcm->loopback->cable_lock); 372597603d6SJaroslav Kysela 373597603d6SJaroslav Kysela return 0; 374597603d6SJaroslav Kysela } 375597603d6SJaroslav Kysela 376597603d6SJaroslav Kysela static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes) 377597603d6SJaroslav Kysela { 378597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = dpcm->substream->runtime; 379597603d6SJaroslav Kysela char *dst = runtime->dma_area; 380597603d6SJaroslav Kysela unsigned int dst_off = dpcm->buf_pos; 381597603d6SJaroslav Kysela 382597603d6SJaroslav Kysela if (dpcm->silent_size >= dpcm->pcm_buffer_size) 383597603d6SJaroslav Kysela return; 384597603d6SJaroslav Kysela if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size) 385597603d6SJaroslav Kysela bytes = dpcm->pcm_buffer_size - dpcm->silent_size; 386597603d6SJaroslav Kysela 387597603d6SJaroslav Kysela for (;;) { 388597603d6SJaroslav Kysela unsigned int size = bytes; 389597603d6SJaroslav Kysela if (dst_off + size > dpcm->pcm_buffer_size) 390597603d6SJaroslav Kysela size = dpcm->pcm_buffer_size - dst_off; 391597603d6SJaroslav Kysela snd_pcm_format_set_silence(runtime->format, dst + dst_off, 392597603d6SJaroslav Kysela bytes_to_frames(runtime, size) * 393597603d6SJaroslav Kysela runtime->channels); 394597603d6SJaroslav Kysela dpcm->silent_size += size; 395597603d6SJaroslav Kysela bytes -= size; 396597603d6SJaroslav Kysela if (!bytes) 397597603d6SJaroslav Kysela break; 398597603d6SJaroslav Kysela dst_off = 0; 399597603d6SJaroslav Kysela } 400597603d6SJaroslav Kysela } 401597603d6SJaroslav Kysela 402597603d6SJaroslav Kysela static void copy_play_buf(struct loopback_pcm *play, 403597603d6SJaroslav Kysela struct loopback_pcm *capt, 404597603d6SJaroslav Kysela unsigned int bytes) 405597603d6SJaroslav Kysela { 406597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = play->substream->runtime; 40720d9a26dSJaroslav Kysela char *src = runtime->dma_area; 408597603d6SJaroslav Kysela char *dst = capt->substream->runtime->dma_area; 409597603d6SJaroslav Kysela unsigned int src_off = play->buf_pos; 410597603d6SJaroslav Kysela unsigned int dst_off = capt->buf_pos; 411597603d6SJaroslav Kysela unsigned int clear_bytes = 0; 412597603d6SJaroslav Kysela 413597603d6SJaroslav Kysela /* check if playback is draining, trim the capture copy size 414597603d6SJaroslav Kysela * when our pointer is at the end of playback ring buffer */ 415597603d6SJaroslav Kysela if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 416597603d6SJaroslav Kysela snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { 417597603d6SJaroslav Kysela snd_pcm_uframes_t appl_ptr, appl_ptr1, diff; 418597603d6SJaroslav Kysela appl_ptr = appl_ptr1 = runtime->control->appl_ptr; 419597603d6SJaroslav Kysela appl_ptr1 -= appl_ptr1 % runtime->buffer_size; 420597603d6SJaroslav Kysela appl_ptr1 += play->buf_pos / play->pcm_salign; 421597603d6SJaroslav Kysela if (appl_ptr < appl_ptr1) 422597603d6SJaroslav Kysela appl_ptr1 -= runtime->buffer_size; 423597603d6SJaroslav Kysela diff = (appl_ptr - appl_ptr1) * play->pcm_salign; 424597603d6SJaroslav Kysela if (diff < bytes) { 425597603d6SJaroslav Kysela clear_bytes = bytes - diff; 426597603d6SJaroslav Kysela bytes = diff; 427597603d6SJaroslav Kysela } 428597603d6SJaroslav Kysela } 429597603d6SJaroslav Kysela 430597603d6SJaroslav Kysela for (;;) { 431597603d6SJaroslav Kysela unsigned int size = bytes; 432597603d6SJaroslav Kysela if (src_off + size > play->pcm_buffer_size) 433597603d6SJaroslav Kysela size = play->pcm_buffer_size - src_off; 434597603d6SJaroslav Kysela if (dst_off + size > capt->pcm_buffer_size) 435597603d6SJaroslav Kysela size = capt->pcm_buffer_size - dst_off; 436597603d6SJaroslav Kysela memcpy(dst + dst_off, src + src_off, size); 437597603d6SJaroslav Kysela capt->silent_size = 0; 438597603d6SJaroslav Kysela bytes -= size; 439597603d6SJaroslav Kysela if (!bytes) 440597603d6SJaroslav Kysela break; 441597603d6SJaroslav Kysela src_off = (src_off + size) % play->pcm_buffer_size; 442597603d6SJaroslav Kysela dst_off = (dst_off + size) % capt->pcm_buffer_size; 443597603d6SJaroslav Kysela } 444597603d6SJaroslav Kysela 44520d9a26dSJaroslav Kysela if (clear_bytes > 0) { 446597603d6SJaroslav Kysela clear_capture_buf(capt, clear_bytes); 44720d9a26dSJaroslav Kysela capt->silent_size = 0; 44820d9a26dSJaroslav Kysela } 449597603d6SJaroslav Kysela } 450597603d6SJaroslav Kysela 451b012513cSJaroslav Kysela static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm, 452b012513cSJaroslav Kysela unsigned int jiffies_delta) 453597603d6SJaroslav Kysela { 454597603d6SJaroslav Kysela unsigned long last_pos; 455b012513cSJaroslav Kysela unsigned int delta; 456597603d6SJaroslav Kysela 457597603d6SJaroslav Kysela last_pos = byte_pos(dpcm, dpcm->irq_pos); 458b012513cSJaroslav Kysela dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps; 459b012513cSJaroslav Kysela delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos; 460b012513cSJaroslav Kysela if (delta >= dpcm->last_drift) 461b012513cSJaroslav Kysela delta -= dpcm->last_drift; 462b012513cSJaroslav Kysela dpcm->last_drift = 0; 463597603d6SJaroslav Kysela if (dpcm->irq_pos >= dpcm->period_size_frac) { 464597603d6SJaroslav Kysela dpcm->irq_pos %= dpcm->period_size_frac; 465597603d6SJaroslav Kysela dpcm->period_update_pending = 1; 466597603d6SJaroslav Kysela } 467b012513cSJaroslav Kysela return delta; 468b012513cSJaroslav Kysela } 469b012513cSJaroslav Kysela 470b012513cSJaroslav Kysela static inline void bytepos_finish(struct loopback_pcm *dpcm, 471b012513cSJaroslav Kysela unsigned int delta) 472b012513cSJaroslav Kysela { 473b012513cSJaroslav Kysela dpcm->buf_pos += delta; 474b012513cSJaroslav Kysela dpcm->buf_pos %= dpcm->pcm_buffer_size; 475597603d6SJaroslav Kysela } 476597603d6SJaroslav Kysela 477999fc9f6STakashi Iwai /* call in cable->lock */ 478dd04bb12SJaroslav Kysela static unsigned int loopback_pos_update(struct loopback_cable *cable) 479597603d6SJaroslav Kysela { 480597603d6SJaroslav Kysela struct loopback_pcm *dpcm_play = 481597603d6SJaroslav Kysela cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; 482597603d6SJaroslav Kysela struct loopback_pcm *dpcm_capt = 483597603d6SJaroslav Kysela cable->streams[SNDRV_PCM_STREAM_CAPTURE]; 484597603d6SJaroslav Kysela unsigned long delta_play = 0, delta_capt = 0; 485b012513cSJaroslav Kysela unsigned int running, count1, count2; 486597603d6SJaroslav Kysela 4875de9e45fSJaroslav Kysela running = cable->running ^ cable->pause; 488dd04bb12SJaroslav Kysela if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { 489597603d6SJaroslav Kysela delta_play = jiffies - dpcm_play->last_jiffies; 490597603d6SJaroslav Kysela dpcm_play->last_jiffies += delta_play; 491597603d6SJaroslav Kysela } 492597603d6SJaroslav Kysela 493dd04bb12SJaroslav Kysela if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { 494597603d6SJaroslav Kysela delta_capt = jiffies - dpcm_capt->last_jiffies; 495597603d6SJaroslav Kysela dpcm_capt->last_jiffies += delta_capt; 496597603d6SJaroslav Kysela } 497597603d6SJaroslav Kysela 49898d21df4STakashi Iwai if (delta_play == 0 && delta_capt == 0) 49998d21df4STakashi Iwai goto unlock; 500597603d6SJaroslav Kysela 501597603d6SJaroslav Kysela if (delta_play > delta_capt) { 502b012513cSJaroslav Kysela count1 = bytepos_delta(dpcm_play, delta_play - delta_capt); 503b012513cSJaroslav Kysela bytepos_finish(dpcm_play, count1); 504597603d6SJaroslav Kysela delta_play = delta_capt; 505597603d6SJaroslav Kysela } else if (delta_play < delta_capt) { 506b012513cSJaroslav Kysela count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play); 507b012513cSJaroslav Kysela clear_capture_buf(dpcm_capt, count1); 508b012513cSJaroslav Kysela bytepos_finish(dpcm_capt, count1); 509597603d6SJaroslav Kysela delta_capt = delta_play; 510597603d6SJaroslav Kysela } 511597603d6SJaroslav Kysela 51298d21df4STakashi Iwai if (delta_play == 0 && delta_capt == 0) 51398d21df4STakashi Iwai goto unlock; 51498d21df4STakashi Iwai 515597603d6SJaroslav Kysela /* note delta_capt == delta_play at this moment */ 516b012513cSJaroslav Kysela count1 = bytepos_delta(dpcm_play, delta_play); 517b012513cSJaroslav Kysela count2 = bytepos_delta(dpcm_capt, delta_capt); 518b012513cSJaroslav Kysela if (count1 < count2) { 519b012513cSJaroslav Kysela dpcm_capt->last_drift = count2 - count1; 520b012513cSJaroslav Kysela count1 = count2; 521b012513cSJaroslav Kysela } else if (count1 > count2) { 522b012513cSJaroslav Kysela dpcm_play->last_drift = count1 - count2; 523b012513cSJaroslav Kysela } 524b012513cSJaroslav Kysela copy_play_buf(dpcm_play, dpcm_capt, count1); 525b012513cSJaroslav Kysela bytepos_finish(dpcm_play, count1); 526b012513cSJaroslav Kysela bytepos_finish(dpcm_capt, count1); 52798d21df4STakashi Iwai unlock: 528dd04bb12SJaroslav Kysela return running; 529597603d6SJaroslav Kysela } 530597603d6SJaroslav Kysela 531597603d6SJaroslav Kysela static void loopback_timer_function(unsigned long data) 532597603d6SJaroslav Kysela { 533597603d6SJaroslav Kysela struct loopback_pcm *dpcm = (struct loopback_pcm *)data; 534999fc9f6STakashi Iwai unsigned long flags; 535597603d6SJaroslav Kysela 536999fc9f6STakashi Iwai spin_lock_irqsave(&dpcm->cable->lock, flags); 537999fc9f6STakashi Iwai if (loopback_pos_update(dpcm->cable) & (1 << dpcm->substream->stream)) { 538597603d6SJaroslav Kysela loopback_timer_start(dpcm); 539597603d6SJaroslav Kysela if (dpcm->period_update_pending) { 540597603d6SJaroslav Kysela dpcm->period_update_pending = 0; 541999fc9f6STakashi Iwai spin_unlock_irqrestore(&dpcm->cable->lock, flags); 542999fc9f6STakashi Iwai /* need to unlock before calling below */ 543597603d6SJaroslav Kysela snd_pcm_period_elapsed(dpcm->substream); 544999fc9f6STakashi Iwai return; 545597603d6SJaroslav Kysela } 546597603d6SJaroslav Kysela } 547999fc9f6STakashi Iwai spin_unlock_irqrestore(&dpcm->cable->lock, flags); 548dd04bb12SJaroslav Kysela } 549597603d6SJaroslav Kysela 550597603d6SJaroslav Kysela static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream) 551597603d6SJaroslav Kysela { 552597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 553597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 554999fc9f6STakashi Iwai snd_pcm_uframes_t pos; 555597603d6SJaroslav Kysela 556999fc9f6STakashi Iwai spin_lock(&dpcm->cable->lock); 557597603d6SJaroslav Kysela loopback_pos_update(dpcm->cable); 558999fc9f6STakashi Iwai pos = dpcm->buf_pos; 559999fc9f6STakashi Iwai spin_unlock(&dpcm->cable->lock); 560999fc9f6STakashi Iwai return bytes_to_frames(runtime, pos); 561597603d6SJaroslav Kysela } 562597603d6SJaroslav Kysela 563597603d6SJaroslav Kysela static struct snd_pcm_hardware loopback_pcm_hardware = 564597603d6SJaroslav Kysela { 565597603d6SJaroslav Kysela .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | 5665de9e45fSJaroslav Kysela SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE), 567597603d6SJaroslav Kysela .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | 568597603d6SJaroslav Kysela SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | 569597603d6SJaroslav Kysela SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE), 570597603d6SJaroslav Kysela .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, 571597603d6SJaroslav Kysela .rate_min = 8000, 572597603d6SJaroslav Kysela .rate_max = 192000, 573597603d6SJaroslav Kysela .channels_min = 1, 574597603d6SJaroslav Kysela .channels_max = 32, 575597603d6SJaroslav Kysela .buffer_bytes_max = 2 * 1024 * 1024, 576597603d6SJaroslav Kysela .period_bytes_min = 64, 5770db71023SJaroslav Kysela /* note check overflow in frac_pos() using pcm_rate_shift before 5780db71023SJaroslav Kysela changing period_bytes_max value */ 5790db71023SJaroslav Kysela .period_bytes_max = 1024 * 1024, 580597603d6SJaroslav Kysela .periods_min = 1, 581597603d6SJaroslav Kysela .periods_max = 1024, 582597603d6SJaroslav Kysela .fifo_size = 0, 583597603d6SJaroslav Kysela }; 584597603d6SJaroslav Kysela 585597603d6SJaroslav Kysela static void loopback_runtime_free(struct snd_pcm_runtime *runtime) 586597603d6SJaroslav Kysela { 587597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 588597603d6SJaroslav Kysela kfree(dpcm); 589597603d6SJaroslav Kysela } 590597603d6SJaroslav Kysela 591597603d6SJaroslav Kysela static int loopback_hw_params(struct snd_pcm_substream *substream, 592597603d6SJaroslav Kysela struct snd_pcm_hw_params *params) 593597603d6SJaroslav Kysela { 5946b69a0e5STakashi Iwai return snd_pcm_lib_alloc_vmalloc_buffer(substream, 5956b69a0e5STakashi Iwai params_buffer_bytes(params)); 596597603d6SJaroslav Kysela } 597597603d6SJaroslav Kysela 598597603d6SJaroslav Kysela static int loopback_hw_free(struct snd_pcm_substream *substream) 599597603d6SJaroslav Kysela { 600597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 601597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 602597603d6SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 603597603d6SJaroslav Kysela 604597603d6SJaroslav Kysela mutex_lock(&dpcm->loopback->cable_lock); 605597603d6SJaroslav Kysela cable->valid &= ~(1 << substream->stream); 606597603d6SJaroslav Kysela mutex_unlock(&dpcm->loopback->cable_lock); 6076b69a0e5STakashi Iwai return snd_pcm_lib_free_vmalloc_buffer(substream); 608597603d6SJaroslav Kysela } 609597603d6SJaroslav Kysela 610597603d6SJaroslav Kysela static unsigned int get_cable_index(struct snd_pcm_substream *substream) 611597603d6SJaroslav Kysela { 612597603d6SJaroslav Kysela if (!substream->pcm->device) 613597603d6SJaroslav Kysela return substream->stream; 614597603d6SJaroslav Kysela else 615597603d6SJaroslav Kysela return !substream->stream; 616597603d6SJaroslav Kysela } 617597603d6SJaroslav Kysela 618b1c73fc8SJaroslav Kysela static int rule_format(struct snd_pcm_hw_params *params, 619b1c73fc8SJaroslav Kysela struct snd_pcm_hw_rule *rule) 620b1c73fc8SJaroslav Kysela { 621b1c73fc8SJaroslav Kysela 622b1c73fc8SJaroslav Kysela struct snd_pcm_hardware *hw = rule->private; 623b1c73fc8SJaroslav Kysela struct snd_mask *maskp = hw_param_mask(params, rule->var); 624b1c73fc8SJaroslav Kysela 625b1c73fc8SJaroslav Kysela maskp->bits[0] &= (u_int32_t)hw->formats; 626b1c73fc8SJaroslav Kysela maskp->bits[1] &= (u_int32_t)(hw->formats >> 32); 627b1c73fc8SJaroslav Kysela memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ 628b1c73fc8SJaroslav Kysela if (! maskp->bits[0] && ! maskp->bits[1]) 629b1c73fc8SJaroslav Kysela return -EINVAL; 630b1c73fc8SJaroslav Kysela return 0; 631b1c73fc8SJaroslav Kysela } 632b1c73fc8SJaroslav Kysela 633b1c73fc8SJaroslav Kysela static int rule_rate(struct snd_pcm_hw_params *params, 634b1c73fc8SJaroslav Kysela struct snd_pcm_hw_rule *rule) 635b1c73fc8SJaroslav Kysela { 636b1c73fc8SJaroslav Kysela struct snd_pcm_hardware *hw = rule->private; 637b1c73fc8SJaroslav Kysela struct snd_interval t; 638b1c73fc8SJaroslav Kysela 639b1c73fc8SJaroslav Kysela t.min = hw->rate_min; 640b1c73fc8SJaroslav Kysela t.max = hw->rate_max; 641b1c73fc8SJaroslav Kysela t.openmin = t.openmax = 0; 642b1c73fc8SJaroslav Kysela t.integer = 0; 643b1c73fc8SJaroslav Kysela return snd_interval_refine(hw_param_interval(params, rule->var), &t); 644b1c73fc8SJaroslav Kysela } 645b1c73fc8SJaroslav Kysela 646b1c73fc8SJaroslav Kysela static int rule_channels(struct snd_pcm_hw_params *params, 647b1c73fc8SJaroslav Kysela struct snd_pcm_hw_rule *rule) 648b1c73fc8SJaroslav Kysela { 649b1c73fc8SJaroslav Kysela struct snd_pcm_hardware *hw = rule->private; 650b1c73fc8SJaroslav Kysela struct snd_interval t; 651b1c73fc8SJaroslav Kysela 652b1c73fc8SJaroslav Kysela t.min = hw->channels_min; 653b1c73fc8SJaroslav Kysela t.max = hw->channels_max; 654b1c73fc8SJaroslav Kysela t.openmin = t.openmax = 0; 655b1c73fc8SJaroslav Kysela t.integer = 0; 656b1c73fc8SJaroslav Kysela return snd_interval_refine(hw_param_interval(params, rule->var), &t); 657b1c73fc8SJaroslav Kysela } 658b1c73fc8SJaroslav Kysela 659597603d6SJaroslav Kysela static int loopback_open(struct snd_pcm_substream *substream) 660597603d6SJaroslav Kysela { 661597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 662597603d6SJaroslav Kysela struct loopback *loopback = substream->private_data; 663597603d6SJaroslav Kysela struct loopback_pcm *dpcm; 664597603d6SJaroslav Kysela struct loopback_cable *cable; 665597603d6SJaroslav Kysela int err = 0; 666597603d6SJaroslav Kysela int dev = get_cable_index(substream); 667597603d6SJaroslav Kysela 668597603d6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 669597603d6SJaroslav Kysela dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 670597603d6SJaroslav Kysela if (!dpcm) { 671597603d6SJaroslav Kysela err = -ENOMEM; 672597603d6SJaroslav Kysela goto unlock; 673597603d6SJaroslav Kysela } 674597603d6SJaroslav Kysela dpcm->loopback = loopback; 675597603d6SJaroslav Kysela dpcm->substream = substream; 676597603d6SJaroslav Kysela setup_timer(&dpcm->timer, loopback_timer_function, 677597603d6SJaroslav Kysela (unsigned long)dpcm); 678597603d6SJaroslav Kysela 679597603d6SJaroslav Kysela cable = loopback->cables[substream->number][dev]; 680597603d6SJaroslav Kysela if (!cable) { 681597603d6SJaroslav Kysela cable = kzalloc(sizeof(*cable), GFP_KERNEL); 682597603d6SJaroslav Kysela if (!cable) { 683597603d6SJaroslav Kysela kfree(dpcm); 684597603d6SJaroslav Kysela err = -ENOMEM; 685597603d6SJaroslav Kysela goto unlock; 686597603d6SJaroslav Kysela } 687597603d6SJaroslav Kysela spin_lock_init(&cable->lock); 688597603d6SJaroslav Kysela cable->hw = loopback_pcm_hardware; 689597603d6SJaroslav Kysela loopback->cables[substream->number][dev] = cable; 690597603d6SJaroslav Kysela } 691597603d6SJaroslav Kysela dpcm->cable = cable; 692597603d6SJaroslav Kysela cable->streams[substream->stream] = dpcm; 693597603d6SJaroslav Kysela 694597603d6SJaroslav Kysela snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 695597603d6SJaroslav Kysela 696b1c73fc8SJaroslav Kysela /* use dynamic rules based on actual runtime->hw values */ 697b1c73fc8SJaroslav Kysela /* note that the default rules created in the PCM midlevel code */ 698b1c73fc8SJaroslav Kysela /* are cached -> they do not reflect the actual state */ 699b1c73fc8SJaroslav Kysela err = snd_pcm_hw_rule_add(runtime, 0, 700b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_FORMAT, 701b1c73fc8SJaroslav Kysela rule_format, &runtime->hw, 702b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_FORMAT, -1); 703b1c73fc8SJaroslav Kysela if (err < 0) 704b1c73fc8SJaroslav Kysela goto unlock; 705b1c73fc8SJaroslav Kysela err = snd_pcm_hw_rule_add(runtime, 0, 706b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_RATE, 707b1c73fc8SJaroslav Kysela rule_rate, &runtime->hw, 708b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_RATE, -1); 709b1c73fc8SJaroslav Kysela if (err < 0) 710b1c73fc8SJaroslav Kysela goto unlock; 711b1c73fc8SJaroslav Kysela err = snd_pcm_hw_rule_add(runtime, 0, 712b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_CHANNELS, 713b1c73fc8SJaroslav Kysela rule_channels, &runtime->hw, 714b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_CHANNELS, -1); 715b1c73fc8SJaroslav Kysela if (err < 0) 716b1c73fc8SJaroslav Kysela goto unlock; 717b1c73fc8SJaroslav Kysela 718597603d6SJaroslav Kysela runtime->private_data = dpcm; 719597603d6SJaroslav Kysela runtime->private_free = loopback_runtime_free; 720b1c73fc8SJaroslav Kysela if (get_notify(dpcm)) 721597603d6SJaroslav Kysela runtime->hw = loopback_pcm_hardware; 722b1c73fc8SJaroslav Kysela else 723597603d6SJaroslav Kysela runtime->hw = cable->hw; 724597603d6SJaroslav Kysela unlock: 725597603d6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 726597603d6SJaroslav Kysela return err; 727597603d6SJaroslav Kysela } 728597603d6SJaroslav Kysela 729597603d6SJaroslav Kysela static int loopback_close(struct snd_pcm_substream *substream) 730597603d6SJaroslav Kysela { 731597603d6SJaroslav Kysela struct loopback *loopback = substream->private_data; 732597603d6SJaroslav Kysela struct loopback_pcm *dpcm = substream->runtime->private_data; 733597603d6SJaroslav Kysela struct loopback_cable *cable; 734597603d6SJaroslav Kysela int dev = get_cable_index(substream); 735597603d6SJaroslav Kysela 736597603d6SJaroslav Kysela loopback_timer_stop(dpcm); 737597603d6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 738597603d6SJaroslav Kysela cable = loopback->cables[substream->number][dev]; 739597603d6SJaroslav Kysela if (cable->streams[!substream->stream]) { 740597603d6SJaroslav Kysela /* other stream is still alive */ 741597603d6SJaroslav Kysela cable->streams[substream->stream] = NULL; 742597603d6SJaroslav Kysela } else { 743597603d6SJaroslav Kysela /* free the cable */ 744597603d6SJaroslav Kysela loopback->cables[substream->number][dev] = NULL; 745597603d6SJaroslav Kysela kfree(cable); 746597603d6SJaroslav Kysela } 747597603d6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 748597603d6SJaroslav Kysela return 0; 749597603d6SJaroslav Kysela } 750597603d6SJaroslav Kysela 751597603d6SJaroslav Kysela static struct snd_pcm_ops loopback_playback_ops = { 752597603d6SJaroslav Kysela .open = loopback_open, 753597603d6SJaroslav Kysela .close = loopback_close, 754597603d6SJaroslav Kysela .ioctl = snd_pcm_lib_ioctl, 755597603d6SJaroslav Kysela .hw_params = loopback_hw_params, 756597603d6SJaroslav Kysela .hw_free = loopback_hw_free, 757597603d6SJaroslav Kysela .prepare = loopback_prepare, 758597603d6SJaroslav Kysela .trigger = loopback_trigger, 759597603d6SJaroslav Kysela .pointer = loopback_pointer, 7606b69a0e5STakashi Iwai .page = snd_pcm_lib_get_vmalloc_page, 7616b69a0e5STakashi Iwai .mmap = snd_pcm_lib_mmap_vmalloc, 762597603d6SJaroslav Kysela }; 763597603d6SJaroslav Kysela 764597603d6SJaroslav Kysela static struct snd_pcm_ops loopback_capture_ops = { 765597603d6SJaroslav Kysela .open = loopback_open, 766597603d6SJaroslav Kysela .close = loopback_close, 767597603d6SJaroslav Kysela .ioctl = snd_pcm_lib_ioctl, 768597603d6SJaroslav Kysela .hw_params = loopback_hw_params, 769597603d6SJaroslav Kysela .hw_free = loopback_hw_free, 770597603d6SJaroslav Kysela .prepare = loopback_prepare, 771597603d6SJaroslav Kysela .trigger = loopback_trigger, 772597603d6SJaroslav Kysela .pointer = loopback_pointer, 7736b69a0e5STakashi Iwai .page = snd_pcm_lib_get_vmalloc_page, 7746b69a0e5STakashi Iwai .mmap = snd_pcm_lib_mmap_vmalloc, 775597603d6SJaroslav Kysela }; 776597603d6SJaroslav Kysela 777fbbb01a1SBill Pemberton static int loopback_pcm_new(struct loopback *loopback, 778597603d6SJaroslav Kysela int device, int substreams) 779597603d6SJaroslav Kysela { 780597603d6SJaroslav Kysela struct snd_pcm *pcm; 781597603d6SJaroslav Kysela int err; 782597603d6SJaroslav Kysela 783597603d6SJaroslav Kysela err = snd_pcm_new(loopback->card, "Loopback PCM", device, 784597603d6SJaroslav Kysela substreams, substreams, &pcm); 785597603d6SJaroslav Kysela if (err < 0) 786597603d6SJaroslav Kysela return err; 787597603d6SJaroslav Kysela snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_playback_ops); 788597603d6SJaroslav Kysela snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_capture_ops); 789597603d6SJaroslav Kysela 790597603d6SJaroslav Kysela pcm->private_data = loopback; 791597603d6SJaroslav Kysela pcm->info_flags = 0; 792597603d6SJaroslav Kysela strcpy(pcm->name, "Loopback PCM"); 793597603d6SJaroslav Kysela 794597603d6SJaroslav Kysela loopback->pcm[device] = pcm; 795597603d6SJaroslav Kysela return 0; 796597603d6SJaroslav Kysela } 797597603d6SJaroslav Kysela 798597603d6SJaroslav Kysela static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol, 799597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 800597603d6SJaroslav Kysela { 801597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 802597603d6SJaroslav Kysela uinfo->count = 1; 803597603d6SJaroslav Kysela uinfo->value.integer.min = 80000; 804597603d6SJaroslav Kysela uinfo->value.integer.max = 120000; 805597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 806597603d6SJaroslav Kysela return 0; 807597603d6SJaroslav Kysela } 808597603d6SJaroslav Kysela 809597603d6SJaroslav Kysela static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol, 810597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 811597603d6SJaroslav Kysela { 812597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 813597603d6SJaroslav Kysela 814597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 815597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 816597603d6SJaroslav Kysela [kcontrol->id.device].rate_shift; 817597603d6SJaroslav Kysela return 0; 818597603d6SJaroslav Kysela } 819597603d6SJaroslav Kysela 820597603d6SJaroslav Kysela static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol, 821597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 822597603d6SJaroslav Kysela { 823597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 824597603d6SJaroslav Kysela unsigned int val; 825597603d6SJaroslav Kysela int change = 0; 826597603d6SJaroslav Kysela 827597603d6SJaroslav Kysela val = ucontrol->value.integer.value[0]; 828597603d6SJaroslav Kysela if (val < 80000) 829597603d6SJaroslav Kysela val = 80000; 830597603d6SJaroslav Kysela if (val > 120000) 831597603d6SJaroslav Kysela val = 120000; 832597603d6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 833597603d6SJaroslav Kysela if (val != loopback->setup[kcontrol->id.subdevice] 834597603d6SJaroslav Kysela [kcontrol->id.device].rate_shift) { 835597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 836597603d6SJaroslav Kysela [kcontrol->id.device].rate_shift = val; 837597603d6SJaroslav Kysela change = 1; 838597603d6SJaroslav Kysela } 839597603d6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 840597603d6SJaroslav Kysela return change; 841597603d6SJaroslav Kysela } 842597603d6SJaroslav Kysela 843597603d6SJaroslav Kysela static int loopback_notify_get(struct snd_kcontrol *kcontrol, 844597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 845597603d6SJaroslav Kysela { 846597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 847597603d6SJaroslav Kysela 848597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 849597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 850597603d6SJaroslav Kysela [kcontrol->id.device].notify; 851597603d6SJaroslav Kysela return 0; 852597603d6SJaroslav Kysela } 853597603d6SJaroslav Kysela 854597603d6SJaroslav Kysela static int loopback_notify_put(struct snd_kcontrol *kcontrol, 855597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 856597603d6SJaroslav Kysela { 857597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 858597603d6SJaroslav Kysela unsigned int val; 859597603d6SJaroslav Kysela int change = 0; 860597603d6SJaroslav Kysela 861597603d6SJaroslav Kysela val = ucontrol->value.integer.value[0] ? 1 : 0; 862597603d6SJaroslav Kysela if (val != loopback->setup[kcontrol->id.subdevice] 863597603d6SJaroslav Kysela [kcontrol->id.device].notify) { 864597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 865597603d6SJaroslav Kysela [kcontrol->id.device].notify = val; 866597603d6SJaroslav Kysela change = 1; 867597603d6SJaroslav Kysela } 868597603d6SJaroslav Kysela return change; 869597603d6SJaroslav Kysela } 870597603d6SJaroslav Kysela 871597603d6SJaroslav Kysela static int loopback_active_get(struct snd_kcontrol *kcontrol, 872597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 873597603d6SJaroslav Kysela { 874597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 875597603d6SJaroslav Kysela struct loopback_cable *cable = loopback->cables 876ac446fb7SJaroslav Kysela [kcontrol->id.subdevice][kcontrol->id.device ^ 1]; 877597603d6SJaroslav Kysela unsigned int val = 0; 878597603d6SJaroslav Kysela 879597603d6SJaroslav Kysela if (cable != NULL) 880597603d6SJaroslav Kysela val = (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? 881597603d6SJaroslav Kysela 1 : 0; 882597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = val; 883597603d6SJaroslav Kysela return 0; 884597603d6SJaroslav Kysela } 885597603d6SJaroslav Kysela 886597603d6SJaroslav Kysela static int loopback_format_info(struct snd_kcontrol *kcontrol, 887597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 888597603d6SJaroslav Kysela { 889597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 890597603d6SJaroslav Kysela uinfo->count = 1; 891597603d6SJaroslav Kysela uinfo->value.integer.min = 0; 892597603d6SJaroslav Kysela uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST; 893597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 894597603d6SJaroslav Kysela return 0; 895597603d6SJaroslav Kysela } 896597603d6SJaroslav Kysela 897597603d6SJaroslav Kysela static int loopback_format_get(struct snd_kcontrol *kcontrol, 898597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 899597603d6SJaroslav Kysela { 900597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 901597603d6SJaroslav Kysela 902597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 903597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 904597603d6SJaroslav Kysela [kcontrol->id.device].format; 905597603d6SJaroslav Kysela return 0; 906597603d6SJaroslav Kysela } 907597603d6SJaroslav Kysela 908597603d6SJaroslav Kysela static int loopback_rate_info(struct snd_kcontrol *kcontrol, 909597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 910597603d6SJaroslav Kysela { 911597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 912597603d6SJaroslav Kysela uinfo->count = 1; 913597603d6SJaroslav Kysela uinfo->value.integer.min = 0; 914597603d6SJaroslav Kysela uinfo->value.integer.max = 192000; 915597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 916597603d6SJaroslav Kysela return 0; 917597603d6SJaroslav Kysela } 918597603d6SJaroslav Kysela 919597603d6SJaroslav Kysela static int loopback_rate_get(struct snd_kcontrol *kcontrol, 920597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 921597603d6SJaroslav Kysela { 922597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 923597603d6SJaroslav Kysela 924597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 925597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 926597603d6SJaroslav Kysela [kcontrol->id.device].rate; 927597603d6SJaroslav Kysela return 0; 928597603d6SJaroslav Kysela } 929597603d6SJaroslav Kysela 930597603d6SJaroslav Kysela static int loopback_channels_info(struct snd_kcontrol *kcontrol, 931597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 932597603d6SJaroslav Kysela { 933597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 934597603d6SJaroslav Kysela uinfo->count = 1; 935597603d6SJaroslav Kysela uinfo->value.integer.min = 1; 936597603d6SJaroslav Kysela uinfo->value.integer.max = 1024; 937597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 938597603d6SJaroslav Kysela return 0; 939597603d6SJaroslav Kysela } 940597603d6SJaroslav Kysela 941597603d6SJaroslav Kysela static int loopback_channels_get(struct snd_kcontrol *kcontrol, 942597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 943597603d6SJaroslav Kysela { 944597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 945597603d6SJaroslav Kysela 946597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 947597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 9481446c5fbSJaroslav Kysela [kcontrol->id.device].channels; 949597603d6SJaroslav Kysela return 0; 950597603d6SJaroslav Kysela } 951597603d6SJaroslav Kysela 952fbbb01a1SBill Pemberton static struct snd_kcontrol_new loopback_controls[] = { 953597603d6SJaroslav Kysela { 954597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 955597603d6SJaroslav Kysela .name = "PCM Rate Shift 100000", 956597603d6SJaroslav Kysela .info = loopback_rate_shift_info, 957597603d6SJaroslav Kysela .get = loopback_rate_shift_get, 958597603d6SJaroslav Kysela .put = loopback_rate_shift_put, 959597603d6SJaroslav Kysela }, 960597603d6SJaroslav Kysela { 961597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 962597603d6SJaroslav Kysela .name = "PCM Notify", 963597603d6SJaroslav Kysela .info = snd_ctl_boolean_mono_info, 964597603d6SJaroslav Kysela .get = loopback_notify_get, 965597603d6SJaroslav Kysela .put = loopback_notify_put, 966597603d6SJaroslav Kysela }, 967597603d6SJaroslav Kysela #define ACTIVE_IDX 2 968597603d6SJaroslav Kysela { 969597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 970597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 971597603d6SJaroslav Kysela .name = "PCM Slave Active", 972597603d6SJaroslav Kysela .info = snd_ctl_boolean_mono_info, 973597603d6SJaroslav Kysela .get = loopback_active_get, 974597603d6SJaroslav Kysela }, 975597603d6SJaroslav Kysela #define FORMAT_IDX 3 976597603d6SJaroslav Kysela { 977597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 978597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 979597603d6SJaroslav Kysela .name = "PCM Slave Format", 980597603d6SJaroslav Kysela .info = loopback_format_info, 981597603d6SJaroslav Kysela .get = loopback_format_get 982597603d6SJaroslav Kysela }, 983597603d6SJaroslav Kysela #define RATE_IDX 4 984597603d6SJaroslav Kysela { 985597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 986597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 987597603d6SJaroslav Kysela .name = "PCM Slave Rate", 988597603d6SJaroslav Kysela .info = loopback_rate_info, 989597603d6SJaroslav Kysela .get = loopback_rate_get 990597603d6SJaroslav Kysela }, 991597603d6SJaroslav Kysela #define CHANNELS_IDX 5 992597603d6SJaroslav Kysela { 993597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 994597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 995597603d6SJaroslav Kysela .name = "PCM Slave Channels", 996597603d6SJaroslav Kysela .info = loopback_channels_info, 997597603d6SJaroslav Kysela .get = loopback_channels_get 998597603d6SJaroslav Kysela } 999597603d6SJaroslav Kysela }; 1000597603d6SJaroslav Kysela 1001fbbb01a1SBill Pemberton static int loopback_mixer_new(struct loopback *loopback, int notify) 1002597603d6SJaroslav Kysela { 1003597603d6SJaroslav Kysela struct snd_card *card = loopback->card; 1004597603d6SJaroslav Kysela struct snd_pcm *pcm; 1005597603d6SJaroslav Kysela struct snd_kcontrol *kctl; 1006597603d6SJaroslav Kysela struct loopback_setup *setup; 1007597603d6SJaroslav Kysela int err, dev, substr, substr_count, idx; 1008597603d6SJaroslav Kysela 1009597603d6SJaroslav Kysela strcpy(card->mixername, "Loopback Mixer"); 1010597603d6SJaroslav Kysela for (dev = 0; dev < 2; dev++) { 1011597603d6SJaroslav Kysela pcm = loopback->pcm[dev]; 1012597603d6SJaroslav Kysela substr_count = 1013597603d6SJaroslav Kysela pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count; 1014597603d6SJaroslav Kysela for (substr = 0; substr < substr_count; substr++) { 1015597603d6SJaroslav Kysela setup = &loopback->setup[substr][dev]; 1016597603d6SJaroslav Kysela setup->notify = notify; 1017597603d6SJaroslav Kysela setup->rate_shift = NO_PITCH; 1018597603d6SJaroslav Kysela setup->format = SNDRV_PCM_FORMAT_S16_LE; 1019597603d6SJaroslav Kysela setup->rate = 48000; 1020597603d6SJaroslav Kysela setup->channels = 2; 1021597603d6SJaroslav Kysela for (idx = 0; idx < ARRAY_SIZE(loopback_controls); 1022597603d6SJaroslav Kysela idx++) { 1023597603d6SJaroslav Kysela kctl = snd_ctl_new1(&loopback_controls[idx], 1024597603d6SJaroslav Kysela loopback); 1025597603d6SJaroslav Kysela if (!kctl) 1026597603d6SJaroslav Kysela return -ENOMEM; 1027597603d6SJaroslav Kysela kctl->id.device = dev; 1028597603d6SJaroslav Kysela kctl->id.subdevice = substr; 1029597603d6SJaroslav Kysela switch (idx) { 1030597603d6SJaroslav Kysela case ACTIVE_IDX: 1031597603d6SJaroslav Kysela setup->active_id = kctl->id; 1032597603d6SJaroslav Kysela break; 1033597603d6SJaroslav Kysela case FORMAT_IDX: 1034597603d6SJaroslav Kysela setup->format_id = kctl->id; 1035597603d6SJaroslav Kysela break; 1036597603d6SJaroslav Kysela case RATE_IDX: 1037597603d6SJaroslav Kysela setup->rate_id = kctl->id; 1038597603d6SJaroslav Kysela break; 1039597603d6SJaroslav Kysela case CHANNELS_IDX: 1040597603d6SJaroslav Kysela setup->channels_id = kctl->id; 1041597603d6SJaroslav Kysela break; 1042597603d6SJaroslav Kysela default: 1043597603d6SJaroslav Kysela break; 1044597603d6SJaroslav Kysela } 1045597603d6SJaroslav Kysela err = snd_ctl_add(card, kctl); 1046597603d6SJaroslav Kysela if (err < 0) 1047597603d6SJaroslav Kysela return err; 1048597603d6SJaroslav Kysela } 1049597603d6SJaroslav Kysela } 1050597603d6SJaroslav Kysela } 1051597603d6SJaroslav Kysela return 0; 1052597603d6SJaroslav Kysela } 1053597603d6SJaroslav Kysela 1054e74670b6SJaroslav Kysela #ifdef CONFIG_PROC_FS 1055e74670b6SJaroslav Kysela 1056e74670b6SJaroslav Kysela static void print_dpcm_info(struct snd_info_buffer *buffer, 1057e74670b6SJaroslav Kysela struct loopback_pcm *dpcm, 1058e74670b6SJaroslav Kysela const char *id) 1059e74670b6SJaroslav Kysela { 1060e74670b6SJaroslav Kysela snd_iprintf(buffer, " %s\n", id); 1061e74670b6SJaroslav Kysela if (dpcm == NULL) { 1062e74670b6SJaroslav Kysela snd_iprintf(buffer, " inactive\n"); 1063e74670b6SJaroslav Kysela return; 1064e74670b6SJaroslav Kysela } 1065e74670b6SJaroslav Kysela snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size); 1066e74670b6SJaroslav Kysela snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos); 1067e74670b6SJaroslav Kysela snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size); 1068e74670b6SJaroslav Kysela snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size); 1069e74670b6SJaroslav Kysela snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps); 1070e74670b6SJaroslav Kysela snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign); 1071e74670b6SJaroslav Kysela snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift); 1072e74670b6SJaroslav Kysela snd_iprintf(buffer, " update_pending:\t%u\n", 1073e74670b6SJaroslav Kysela dpcm->period_update_pending); 1074e74670b6SJaroslav Kysela snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos); 1075e74670b6SJaroslav Kysela snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac); 1076e74670b6SJaroslav Kysela snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n", 1077e74670b6SJaroslav Kysela dpcm->last_jiffies, jiffies); 1078e74670b6SJaroslav Kysela snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires); 1079e74670b6SJaroslav Kysela } 1080e74670b6SJaroslav Kysela 1081e74670b6SJaroslav Kysela static void print_substream_info(struct snd_info_buffer *buffer, 1082e74670b6SJaroslav Kysela struct loopback *loopback, 1083e74670b6SJaroslav Kysela int sub, 1084e74670b6SJaroslav Kysela int num) 1085e74670b6SJaroslav Kysela { 1086e74670b6SJaroslav Kysela struct loopback_cable *cable = loopback->cables[sub][num]; 1087e74670b6SJaroslav Kysela 1088e74670b6SJaroslav Kysela snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub); 1089e74670b6SJaroslav Kysela if (cable == NULL) { 1090e74670b6SJaroslav Kysela snd_iprintf(buffer, " inactive\n"); 1091e74670b6SJaroslav Kysela return; 1092e74670b6SJaroslav Kysela } 1093e74670b6SJaroslav Kysela snd_iprintf(buffer, " valid: %u\n", cable->valid); 1094e74670b6SJaroslav Kysela snd_iprintf(buffer, " running: %u\n", cable->running); 10955de9e45fSJaroslav Kysela snd_iprintf(buffer, " pause: %u\n", cable->pause); 1096e74670b6SJaroslav Kysela print_dpcm_info(buffer, cable->streams[0], "Playback"); 1097e74670b6SJaroslav Kysela print_dpcm_info(buffer, cable->streams[1], "Capture"); 1098e74670b6SJaroslav Kysela } 1099e74670b6SJaroslav Kysela 1100e74670b6SJaroslav Kysela static void print_cable_info(struct snd_info_entry *entry, 1101e74670b6SJaroslav Kysela struct snd_info_buffer *buffer) 1102e74670b6SJaroslav Kysela { 1103e74670b6SJaroslav Kysela struct loopback *loopback = entry->private_data; 1104e74670b6SJaroslav Kysela int sub, num; 1105e74670b6SJaroslav Kysela 1106e74670b6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 1107e74670b6SJaroslav Kysela num = entry->name[strlen(entry->name)-1]; 1108e74670b6SJaroslav Kysela num = num == '0' ? 0 : 1; 1109e74670b6SJaroslav Kysela for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++) 1110e74670b6SJaroslav Kysela print_substream_info(buffer, loopback, sub, num); 1111e74670b6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 1112e74670b6SJaroslav Kysela } 1113e74670b6SJaroslav Kysela 1114fbbb01a1SBill Pemberton static int loopback_proc_new(struct loopback *loopback, int cidx) 1115e74670b6SJaroslav Kysela { 1116e74670b6SJaroslav Kysela char name[32]; 1117e74670b6SJaroslav Kysela struct snd_info_entry *entry; 1118e74670b6SJaroslav Kysela int err; 1119e74670b6SJaroslav Kysela 1120e74670b6SJaroslav Kysela snprintf(name, sizeof(name), "cable#%d", cidx); 1121e74670b6SJaroslav Kysela err = snd_card_proc_new(loopback->card, name, &entry); 1122e74670b6SJaroslav Kysela if (err < 0) 1123e74670b6SJaroslav Kysela return err; 1124e74670b6SJaroslav Kysela 1125e74670b6SJaroslav Kysela snd_info_set_text_ops(entry, loopback, print_cable_info); 1126e74670b6SJaroslav Kysela return 0; 1127e74670b6SJaroslav Kysela } 1128e74670b6SJaroslav Kysela 1129e74670b6SJaroslav Kysela #else /* !CONFIG_PROC_FS */ 1130e74670b6SJaroslav Kysela 1131e74670b6SJaroslav Kysela #define loopback_proc_new(loopback, cidx) do { } while (0) 1132e74670b6SJaroslav Kysela 1133e74670b6SJaroslav Kysela #endif 1134e74670b6SJaroslav Kysela 1135fbbb01a1SBill Pemberton static int loopback_probe(struct platform_device *devptr) 1136597603d6SJaroslav Kysela { 1137597603d6SJaroslav Kysela struct snd_card *card; 1138597603d6SJaroslav Kysela struct loopback *loopback; 1139597603d6SJaroslav Kysela int dev = devptr->id; 1140597603d6SJaroslav Kysela int err; 1141597603d6SJaroslav Kysela 1142597603d6SJaroslav Kysela err = snd_card_create(index[dev], id[dev], THIS_MODULE, 1143597603d6SJaroslav Kysela sizeof(struct loopback), &card); 1144597603d6SJaroslav Kysela if (err < 0) 1145597603d6SJaroslav Kysela return err; 1146597603d6SJaroslav Kysela loopback = card->private_data; 1147597603d6SJaroslav Kysela 1148597603d6SJaroslav Kysela if (pcm_substreams[dev] < 1) 1149597603d6SJaroslav Kysela pcm_substreams[dev] = 1; 1150597603d6SJaroslav Kysela if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) 1151597603d6SJaroslav Kysela pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; 1152597603d6SJaroslav Kysela 1153597603d6SJaroslav Kysela loopback->card = card; 1154597603d6SJaroslav Kysela mutex_init(&loopback->cable_lock); 1155597603d6SJaroslav Kysela 1156597603d6SJaroslav Kysela err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]); 1157597603d6SJaroslav Kysela if (err < 0) 1158597603d6SJaroslav Kysela goto __nodev; 1159597603d6SJaroslav Kysela err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]); 1160597603d6SJaroslav Kysela if (err < 0) 1161597603d6SJaroslav Kysela goto __nodev; 1162597603d6SJaroslav Kysela err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0); 1163597603d6SJaroslav Kysela if (err < 0) 1164597603d6SJaroslav Kysela goto __nodev; 1165e74670b6SJaroslav Kysela loopback_proc_new(loopback, 0); 1166e74670b6SJaroslav Kysela loopback_proc_new(loopback, 1); 1167597603d6SJaroslav Kysela strcpy(card->driver, "Loopback"); 1168597603d6SJaroslav Kysela strcpy(card->shortname, "Loopback"); 1169597603d6SJaroslav Kysela sprintf(card->longname, "Loopback %i", dev + 1); 1170597603d6SJaroslav Kysela err = snd_card_register(card); 1171597603d6SJaroslav Kysela if (!err) { 1172597603d6SJaroslav Kysela platform_set_drvdata(devptr, card); 1173597603d6SJaroslav Kysela return 0; 1174597603d6SJaroslav Kysela } 1175597603d6SJaroslav Kysela __nodev: 1176597603d6SJaroslav Kysela snd_card_free(card); 1177597603d6SJaroslav Kysela return err; 1178597603d6SJaroslav Kysela } 1179597603d6SJaroslav Kysela 1180fbbb01a1SBill Pemberton static int loopback_remove(struct platform_device *devptr) 1181597603d6SJaroslav Kysela { 1182597603d6SJaroslav Kysela snd_card_free(platform_get_drvdata(devptr)); 1183597603d6SJaroslav Kysela platform_set_drvdata(devptr, NULL); 1184597603d6SJaroslav Kysela return 0; 1185597603d6SJaroslav Kysela } 1186597603d6SJaroslav Kysela 1187d34e4e00STakashi Iwai #ifdef CONFIG_PM_SLEEP 1188284e7ca7STakashi Iwai static int loopback_suspend(struct device *pdev) 1189597603d6SJaroslav Kysela { 1190284e7ca7STakashi Iwai struct snd_card *card = dev_get_drvdata(pdev); 1191597603d6SJaroslav Kysela struct loopback *loopback = card->private_data; 1192597603d6SJaroslav Kysela 1193597603d6SJaroslav Kysela snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 1194597603d6SJaroslav Kysela 1195597603d6SJaroslav Kysela snd_pcm_suspend_all(loopback->pcm[0]); 1196597603d6SJaroslav Kysela snd_pcm_suspend_all(loopback->pcm[1]); 1197597603d6SJaroslav Kysela return 0; 1198597603d6SJaroslav Kysela } 1199597603d6SJaroslav Kysela 1200284e7ca7STakashi Iwai static int loopback_resume(struct device *pdev) 1201597603d6SJaroslav Kysela { 1202284e7ca7STakashi Iwai struct snd_card *card = dev_get_drvdata(pdev); 1203597603d6SJaroslav Kysela 1204597603d6SJaroslav Kysela snd_power_change_state(card, SNDRV_CTL_POWER_D0); 1205597603d6SJaroslav Kysela return 0; 1206597603d6SJaroslav Kysela } 1207284e7ca7STakashi Iwai 1208284e7ca7STakashi Iwai static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume); 1209284e7ca7STakashi Iwai #define LOOPBACK_PM_OPS &loopback_pm 1210284e7ca7STakashi Iwai #else 1211284e7ca7STakashi Iwai #define LOOPBACK_PM_OPS NULL 1212597603d6SJaroslav Kysela #endif 1213597603d6SJaroslav Kysela 1214597603d6SJaroslav Kysela #define SND_LOOPBACK_DRIVER "snd_aloop" 1215597603d6SJaroslav Kysela 1216597603d6SJaroslav Kysela static struct platform_driver loopback_driver = { 1217597603d6SJaroslav Kysela .probe = loopback_probe, 1218fbbb01a1SBill Pemberton .remove = loopback_remove, 1219597603d6SJaroslav Kysela .driver = { 12208bf01d8aSTakashi Iwai .name = SND_LOOPBACK_DRIVER, 12218bf01d8aSTakashi Iwai .owner = THIS_MODULE, 1222284e7ca7STakashi Iwai .pm = LOOPBACK_PM_OPS, 1223597603d6SJaroslav Kysela }, 1224597603d6SJaroslav Kysela }; 1225597603d6SJaroslav Kysela 1226597603d6SJaroslav Kysela static void loopback_unregister_all(void) 1227597603d6SJaroslav Kysela { 1228597603d6SJaroslav Kysela int i; 1229597603d6SJaroslav Kysela 1230597603d6SJaroslav Kysela for (i = 0; i < ARRAY_SIZE(devices); ++i) 1231597603d6SJaroslav Kysela platform_device_unregister(devices[i]); 1232597603d6SJaroslav Kysela platform_driver_unregister(&loopback_driver); 1233597603d6SJaroslav Kysela } 1234597603d6SJaroslav Kysela 1235597603d6SJaroslav Kysela static int __init alsa_card_loopback_init(void) 1236597603d6SJaroslav Kysela { 1237597603d6SJaroslav Kysela int i, err, cards; 1238597603d6SJaroslav Kysela 1239597603d6SJaroslav Kysela err = platform_driver_register(&loopback_driver); 1240597603d6SJaroslav Kysela if (err < 0) 1241597603d6SJaroslav Kysela return err; 1242597603d6SJaroslav Kysela 1243597603d6SJaroslav Kysela 1244597603d6SJaroslav Kysela cards = 0; 1245597603d6SJaroslav Kysela for (i = 0; i < SNDRV_CARDS; i++) { 1246597603d6SJaroslav Kysela struct platform_device *device; 1247597603d6SJaroslav Kysela if (!enable[i]) 1248597603d6SJaroslav Kysela continue; 1249597603d6SJaroslav Kysela device = platform_device_register_simple(SND_LOOPBACK_DRIVER, 1250597603d6SJaroslav Kysela i, NULL, 0); 1251597603d6SJaroslav Kysela if (IS_ERR(device)) 1252597603d6SJaroslav Kysela continue; 1253597603d6SJaroslav Kysela if (!platform_get_drvdata(device)) { 1254597603d6SJaroslav Kysela platform_device_unregister(device); 1255597603d6SJaroslav Kysela continue; 1256597603d6SJaroslav Kysela } 1257597603d6SJaroslav Kysela devices[i] = device; 1258597603d6SJaroslav Kysela cards++; 1259597603d6SJaroslav Kysela } 1260597603d6SJaroslav Kysela if (!cards) { 1261597603d6SJaroslav Kysela #ifdef MODULE 1262597603d6SJaroslav Kysela printk(KERN_ERR "aloop: No loopback enabled\n"); 1263597603d6SJaroslav Kysela #endif 1264597603d6SJaroslav Kysela loopback_unregister_all(); 1265597603d6SJaroslav Kysela return -ENODEV; 1266597603d6SJaroslav Kysela } 1267597603d6SJaroslav Kysela return 0; 1268597603d6SJaroslav Kysela } 1269597603d6SJaroslav Kysela 1270597603d6SJaroslav Kysela static void __exit alsa_card_loopback_exit(void) 1271597603d6SJaroslav Kysela { 1272597603d6SJaroslav Kysela loopback_unregister_all(); 1273597603d6SJaroslav Kysela } 1274597603d6SJaroslav Kysela 1275597603d6SJaroslav Kysela module_init(alsa_card_loopback_init) 1276597603d6SJaroslav Kysela module_exit(alsa_card_loopback_exit) 1277