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> 42b088b53eSTakashi Iwai #include <sound/pcm_params.h> 43e74670b6SJaroslav Kysela #include <sound/info.h> 44597603d6SJaroslav Kysela #include <sound/initval.h> 45597603d6SJaroslav Kysela 46597603d6SJaroslav Kysela MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 47597603d6SJaroslav Kysela MODULE_DESCRIPTION("A loopback soundcard"); 48597603d6SJaroslav Kysela MODULE_LICENSE("GPL"); 49597603d6SJaroslav Kysela MODULE_SUPPORTED_DEVICE("{{ALSA,Loopback soundcard}}"); 50597603d6SJaroslav Kysela 51597603d6SJaroslav Kysela #define MAX_PCM_SUBSTREAMS 8 52597603d6SJaroslav Kysela 53597603d6SJaroslav Kysela static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 54597603d6SJaroslav Kysela static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 55a67ff6a5SRusty Russell static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; 56597603d6SJaroslav Kysela static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; 57597603d6SJaroslav Kysela static int pcm_notify[SNDRV_CARDS]; 58597603d6SJaroslav Kysela 59597603d6SJaroslav Kysela module_param_array(index, int, NULL, 0444); 60597603d6SJaroslav Kysela MODULE_PARM_DESC(index, "Index value for loopback soundcard."); 61597603d6SJaroslav Kysela module_param_array(id, charp, NULL, 0444); 62597603d6SJaroslav Kysela MODULE_PARM_DESC(id, "ID string for loopback soundcard."); 63597603d6SJaroslav Kysela module_param_array(enable, bool, NULL, 0444); 64597603d6SJaroslav Kysela MODULE_PARM_DESC(enable, "Enable this loopback soundcard."); 65597603d6SJaroslav Kysela module_param_array(pcm_substreams, int, NULL, 0444); 66597603d6SJaroslav Kysela MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for loopback driver."); 67597603d6SJaroslav Kysela module_param_array(pcm_notify, int, NULL, 0444); 68597603d6SJaroslav Kysela MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels changes."); 69597603d6SJaroslav Kysela 70597603d6SJaroslav Kysela #define NO_PITCH 100000 71597603d6SJaroslav Kysela 72597603d6SJaroslav Kysela struct loopback_pcm; 73597603d6SJaroslav Kysela 74597603d6SJaroslav Kysela struct loopback_cable { 75597603d6SJaroslav Kysela spinlock_t lock; 76597603d6SJaroslav Kysela struct loopback_pcm *streams[2]; 77597603d6SJaroslav Kysela struct snd_pcm_hardware hw; 78597603d6SJaroslav Kysela /* flags */ 79597603d6SJaroslav Kysela unsigned int valid; 80597603d6SJaroslav Kysela unsigned int running; 815de9e45fSJaroslav Kysela unsigned int pause; 82597603d6SJaroslav Kysela }; 83597603d6SJaroslav Kysela 84597603d6SJaroslav Kysela struct loopback_setup { 85597603d6SJaroslav Kysela unsigned int notify: 1; 86597603d6SJaroslav Kysela unsigned int rate_shift; 87597603d6SJaroslav Kysela unsigned int format; 88597603d6SJaroslav Kysela unsigned int rate; 89597603d6SJaroslav Kysela unsigned int channels; 90597603d6SJaroslav Kysela struct snd_ctl_elem_id active_id; 91597603d6SJaroslav Kysela struct snd_ctl_elem_id format_id; 92597603d6SJaroslav Kysela struct snd_ctl_elem_id rate_id; 93597603d6SJaroslav Kysela struct snd_ctl_elem_id channels_id; 94597603d6SJaroslav Kysela }; 95597603d6SJaroslav Kysela 96597603d6SJaroslav Kysela struct loopback { 97597603d6SJaroslav Kysela struct snd_card *card; 98597603d6SJaroslav Kysela struct mutex cable_lock; 99597603d6SJaroslav Kysela struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2]; 100597603d6SJaroslav Kysela struct snd_pcm *pcm[2]; 101597603d6SJaroslav Kysela struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2]; 102597603d6SJaroslav Kysela }; 103597603d6SJaroslav Kysela 104597603d6SJaroslav Kysela struct loopback_pcm { 105597603d6SJaroslav Kysela struct loopback *loopback; 106597603d6SJaroslav Kysela struct snd_pcm_substream *substream; 107597603d6SJaroslav Kysela struct loopback_cable *cable; 108597603d6SJaroslav Kysela unsigned int pcm_buffer_size; 109597603d6SJaroslav Kysela unsigned int buf_pos; /* position in buffer */ 110597603d6SJaroslav Kysela unsigned int silent_size; 111597603d6SJaroslav Kysela /* PCM parameters */ 112597603d6SJaroslav Kysela unsigned int pcm_period_size; 113597603d6SJaroslav Kysela unsigned int pcm_bps; /* bytes per second */ 114597603d6SJaroslav Kysela unsigned int pcm_salign; /* bytes per sample * channels */ 115597603d6SJaroslav Kysela unsigned int pcm_rate_shift; /* rate shift value */ 116597603d6SJaroslav Kysela /* flags */ 117597603d6SJaroslav Kysela unsigned int period_update_pending :1; 118597603d6SJaroslav Kysela /* timer stuff */ 119597603d6SJaroslav Kysela unsigned int irq_pos; /* fractional IRQ position */ 120597603d6SJaroslav Kysela unsigned int period_size_frac; 121b012513cSJaroslav Kysela unsigned int last_drift; 122597603d6SJaroslav Kysela unsigned long last_jiffies; 123597603d6SJaroslav Kysela struct timer_list timer; 124597603d6SJaroslav Kysela }; 125597603d6SJaroslav Kysela 126597603d6SJaroslav Kysela static struct platform_device *devices[SNDRV_CARDS]; 127597603d6SJaroslav Kysela 128597603d6SJaroslav Kysela static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x) 129597603d6SJaroslav Kysela { 130597603d6SJaroslav Kysela if (dpcm->pcm_rate_shift == NO_PITCH) { 131597603d6SJaroslav Kysela x /= HZ; 132597603d6SJaroslav Kysela } else { 133597603d6SJaroslav Kysela x = div_u64(NO_PITCH * (unsigned long long)x, 134597603d6SJaroslav Kysela HZ * (unsigned long long)dpcm->pcm_rate_shift); 135597603d6SJaroslav Kysela } 136597603d6SJaroslav Kysela return x - (x % dpcm->pcm_salign); 137597603d6SJaroslav Kysela } 138597603d6SJaroslav Kysela 139597603d6SJaroslav Kysela static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x) 140597603d6SJaroslav Kysela { 141597603d6SJaroslav Kysela if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */ 142597603d6SJaroslav Kysela return x * HZ; 143597603d6SJaroslav Kysela } else { 144597603d6SJaroslav Kysela x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ, 145597603d6SJaroslav Kysela NO_PITCH); 146597603d6SJaroslav Kysela } 147597603d6SJaroslav Kysela return x; 148597603d6SJaroslav Kysela } 149597603d6SJaroslav Kysela 150597603d6SJaroslav Kysela static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm) 151597603d6SJaroslav Kysela { 152597603d6SJaroslav Kysela int device = dpcm->substream->pstr->pcm->device; 153597603d6SJaroslav Kysela 154597603d6SJaroslav Kysela if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 155597603d6SJaroslav Kysela device ^= 1; 156597603d6SJaroslav Kysela return &dpcm->loopback->setup[dpcm->substream->number][device]; 157597603d6SJaroslav Kysela } 158597603d6SJaroslav Kysela 159597603d6SJaroslav Kysela static inline unsigned int get_notify(struct loopback_pcm *dpcm) 160597603d6SJaroslav Kysela { 161597603d6SJaroslav Kysela return get_setup(dpcm)->notify; 162597603d6SJaroslav Kysela } 163597603d6SJaroslav Kysela 164597603d6SJaroslav Kysela static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm) 165597603d6SJaroslav Kysela { 166597603d6SJaroslav Kysela return get_setup(dpcm)->rate_shift; 167597603d6SJaroslav Kysela } 168597603d6SJaroslav Kysela 169999fc9f6STakashi Iwai /* call in cable->lock */ 170597603d6SJaroslav Kysela static void loopback_timer_start(struct loopback_pcm *dpcm) 171597603d6SJaroslav Kysela { 172597603d6SJaroslav Kysela unsigned long tick; 173597603d6SJaroslav Kysela unsigned int rate_shift = get_rate_shift(dpcm); 174597603d6SJaroslav Kysela 175597603d6SJaroslav Kysela if (rate_shift != dpcm->pcm_rate_shift) { 176597603d6SJaroslav Kysela dpcm->pcm_rate_shift = rate_shift; 177597603d6SJaroslav Kysela dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size); 178597603d6SJaroslav Kysela } 1790db71023SJaroslav Kysela if (dpcm->period_size_frac <= dpcm->irq_pos) { 1800db71023SJaroslav Kysela dpcm->irq_pos %= dpcm->period_size_frac; 1810db71023SJaroslav Kysela dpcm->period_update_pending = 1; 1820db71023SJaroslav Kysela } 183597603d6SJaroslav Kysela tick = dpcm->period_size_frac - dpcm->irq_pos; 184597603d6SJaroslav Kysela tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps; 185db974553STakashi Iwai mod_timer(&dpcm->timer, jiffies + tick); 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 19567a01afaSTakashi Iwai static inline void loopback_timer_stop_sync(struct loopback_pcm *dpcm) 19667a01afaSTakashi Iwai { 19767a01afaSTakashi Iwai del_timer_sync(&dpcm->timer); 19867a01afaSTakashi Iwai } 19967a01afaSTakashi Iwai 200597603d6SJaroslav Kysela #define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK) 201597603d6SJaroslav Kysela #define CABLE_VALID_CAPTURE (1 << SNDRV_PCM_STREAM_CAPTURE) 202597603d6SJaroslav Kysela #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE) 203597603d6SJaroslav Kysela 204597603d6SJaroslav Kysela static int loopback_check_format(struct loopback_cable *cable, int stream) 205597603d6SJaroslav Kysela { 206b1c73fc8SJaroslav Kysela struct snd_pcm_runtime *runtime, *cruntime; 207597603d6SJaroslav Kysela struct loopback_setup *setup; 208597603d6SJaroslav Kysela struct snd_card *card; 209597603d6SJaroslav Kysela int check; 210597603d6SJaroslav Kysela 211597603d6SJaroslav Kysela if (cable->valid != CABLE_VALID_BOTH) { 212597603d6SJaroslav Kysela if (stream == SNDRV_PCM_STREAM_PLAYBACK) 213597603d6SJaroslav Kysela goto __notify; 214597603d6SJaroslav Kysela return 0; 215597603d6SJaroslav Kysela } 216597603d6SJaroslav Kysela runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> 217597603d6SJaroslav Kysela substream->runtime; 218b1c73fc8SJaroslav Kysela cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> 219b1c73fc8SJaroslav Kysela substream->runtime; 220b1c73fc8SJaroslav Kysela check = runtime->format != cruntime->format || 221b1c73fc8SJaroslav Kysela runtime->rate != cruntime->rate || 222b1c73fc8SJaroslav Kysela runtime->channels != cruntime->channels; 223597603d6SJaroslav Kysela if (!check) 224597603d6SJaroslav Kysela return 0; 225597603d6SJaroslav Kysela if (stream == SNDRV_PCM_STREAM_CAPTURE) { 226597603d6SJaroslav Kysela return -EIO; 227597603d6SJaroslav Kysela } else { 228597603d6SJaroslav Kysela snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> 229597603d6SJaroslav Kysela substream, SNDRV_PCM_STATE_DRAINING); 230597603d6SJaroslav Kysela __notify: 231597603d6SJaroslav Kysela runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> 232597603d6SJaroslav Kysela substream->runtime; 233597603d6SJaroslav Kysela setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]); 234597603d6SJaroslav Kysela card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card; 235597603d6SJaroslav Kysela if (setup->format != runtime->format) { 236597603d6SJaroslav Kysela snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, 237597603d6SJaroslav Kysela &setup->format_id); 238597603d6SJaroslav Kysela setup->format = runtime->format; 239597603d6SJaroslav Kysela } 240597603d6SJaroslav Kysela if (setup->rate != runtime->rate) { 241597603d6SJaroslav Kysela snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, 242597603d6SJaroslav Kysela &setup->rate_id); 243597603d6SJaroslav Kysela setup->rate = runtime->rate; 244597603d6SJaroslav Kysela } 245597603d6SJaroslav Kysela if (setup->channels != runtime->channels) { 246597603d6SJaroslav Kysela snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, 247597603d6SJaroslav Kysela &setup->channels_id); 248597603d6SJaroslav Kysela setup->channels = runtime->channels; 249597603d6SJaroslav Kysela } 250597603d6SJaroslav Kysela } 251597603d6SJaroslav Kysela return 0; 252597603d6SJaroslav Kysela } 253597603d6SJaroslav Kysela 254597603d6SJaroslav Kysela static void loopback_active_notify(struct loopback_pcm *dpcm) 255597603d6SJaroslav Kysela { 256597603d6SJaroslav Kysela snd_ctl_notify(dpcm->loopback->card, 257597603d6SJaroslav Kysela SNDRV_CTL_EVENT_MASK_VALUE, 258597603d6SJaroslav Kysela &get_setup(dpcm)->active_id); 259597603d6SJaroslav Kysela } 260597603d6SJaroslav Kysela 261597603d6SJaroslav Kysela static int loopback_trigger(struct snd_pcm_substream *substream, int cmd) 262597603d6SJaroslav Kysela { 263597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 264597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 265597603d6SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 2665de9e45fSJaroslav Kysela int err, stream = 1 << substream->stream; 267597603d6SJaroslav Kysela 268597603d6SJaroslav Kysela switch (cmd) { 269597603d6SJaroslav Kysela case SNDRV_PCM_TRIGGER_START: 270597603d6SJaroslav Kysela err = loopback_check_format(cable, substream->stream); 271597603d6SJaroslav Kysela if (err < 0) 272597603d6SJaroslav Kysela return err; 273597603d6SJaroslav Kysela dpcm->last_jiffies = jiffies; 274597603d6SJaroslav Kysela dpcm->pcm_rate_shift = 0; 275b012513cSJaroslav Kysela dpcm->last_drift = 0; 276dd04bb12SJaroslav Kysela spin_lock(&cable->lock); 2775de9e45fSJaroslav Kysela cable->running |= stream; 2785de9e45fSJaroslav Kysela cable->pause &= ~stream; 279dd04bb12SJaroslav Kysela loopback_timer_start(dpcm); 280999fc9f6STakashi Iwai spin_unlock(&cable->lock); 281597603d6SJaroslav Kysela if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 282597603d6SJaroslav Kysela loopback_active_notify(dpcm); 283597603d6SJaroslav Kysela break; 284597603d6SJaroslav Kysela case SNDRV_PCM_TRIGGER_STOP: 285dd04bb12SJaroslav Kysela spin_lock(&cable->lock); 2865de9e45fSJaroslav Kysela cable->running &= ~stream; 2875de9e45fSJaroslav Kysela cable->pause &= ~stream; 288597603d6SJaroslav Kysela loopback_timer_stop(dpcm); 289999fc9f6STakashi Iwai spin_unlock(&cable->lock); 290597603d6SJaroslav Kysela if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 291597603d6SJaroslav Kysela loopback_active_notify(dpcm); 292597603d6SJaroslav Kysela break; 2935de9e45fSJaroslav Kysela case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 294edac8943STakashi Iwai case SNDRV_PCM_TRIGGER_SUSPEND: 2955de9e45fSJaroslav Kysela spin_lock(&cable->lock); 2965de9e45fSJaroslav Kysela cable->pause |= stream; 2975de9e45fSJaroslav Kysela loopback_timer_stop(dpcm); 298999fc9f6STakashi Iwai spin_unlock(&cable->lock); 2995de9e45fSJaroslav Kysela break; 3005de9e45fSJaroslav Kysela case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 301edac8943STakashi Iwai case SNDRV_PCM_TRIGGER_RESUME: 3025de9e45fSJaroslav Kysela spin_lock(&cable->lock); 3035de9e45fSJaroslav Kysela dpcm->last_jiffies = jiffies; 3045de9e45fSJaroslav Kysela cable->pause &= ~stream; 3055de9e45fSJaroslav Kysela loopback_timer_start(dpcm); 306999fc9f6STakashi Iwai spin_unlock(&cable->lock); 3075de9e45fSJaroslav Kysela break; 308597603d6SJaroslav Kysela default: 309597603d6SJaroslav Kysela return -EINVAL; 310597603d6SJaroslav Kysela } 311597603d6SJaroslav Kysela return 0; 312597603d6SJaroslav Kysela } 313597603d6SJaroslav Kysela 314b1c73fc8SJaroslav Kysela static void params_change(struct snd_pcm_substream *substream) 315b1c73fc8SJaroslav Kysela { 316b1c73fc8SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 317b1c73fc8SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 318b1c73fc8SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 319b1c73fc8SJaroslav Kysela 32074c34ca1SEldad Zack cable->hw.formats = pcm_format_to_bits(runtime->format); 321b1c73fc8SJaroslav Kysela cable->hw.rate_min = runtime->rate; 322b1c73fc8SJaroslav Kysela cable->hw.rate_max = runtime->rate; 323b1c73fc8SJaroslav Kysela cable->hw.channels_min = runtime->channels; 324b1c73fc8SJaroslav Kysela cable->hw.channels_max = runtime->channels; 325b1c73fc8SJaroslav Kysela } 326b1c73fc8SJaroslav Kysela 327597603d6SJaroslav Kysela static int loopback_prepare(struct snd_pcm_substream *substream) 328597603d6SJaroslav Kysela { 329597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 330597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 331597603d6SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 332b1c73fc8SJaroslav Kysela int bps, salign; 333597603d6SJaroslav Kysela 33467a01afaSTakashi Iwai loopback_timer_stop_sync(dpcm); 33567a01afaSTakashi Iwai 336597603d6SJaroslav Kysela salign = (snd_pcm_format_width(runtime->format) * 337597603d6SJaroslav Kysela runtime->channels) / 8; 338597603d6SJaroslav Kysela bps = salign * runtime->rate; 339597603d6SJaroslav Kysela if (bps <= 0 || salign <= 0) 340597603d6SJaroslav Kysela return -EINVAL; 341597603d6SJaroslav Kysela 342597603d6SJaroslav Kysela dpcm->buf_pos = 0; 343597603d6SJaroslav Kysela dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size); 344597603d6SJaroslav Kysela if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 345597603d6SJaroslav Kysela /* clear capture buffer */ 346597603d6SJaroslav Kysela dpcm->silent_size = dpcm->pcm_buffer_size; 347597603d6SJaroslav Kysela snd_pcm_format_set_silence(runtime->format, runtime->dma_area, 348597603d6SJaroslav Kysela runtime->buffer_size * runtime->channels); 349597603d6SJaroslav Kysela } 350597603d6SJaroslav Kysela 351597603d6SJaroslav Kysela dpcm->irq_pos = 0; 352597603d6SJaroslav Kysela dpcm->period_update_pending = 0; 353597603d6SJaroslav Kysela dpcm->pcm_bps = bps; 354597603d6SJaroslav Kysela dpcm->pcm_salign = salign; 355597603d6SJaroslav Kysela dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size); 356597603d6SJaroslav Kysela 357597603d6SJaroslav Kysela mutex_lock(&dpcm->loopback->cable_lock); 358b1c73fc8SJaroslav Kysela if (!(cable->valid & ~(1 << substream->stream)) || 359b1c73fc8SJaroslav Kysela (get_setup(dpcm)->notify && 360b1c73fc8SJaroslav Kysela substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) 361b1c73fc8SJaroslav Kysela params_change(substream); 362597603d6SJaroslav Kysela cable->valid |= 1 << substream->stream; 363597603d6SJaroslav Kysela mutex_unlock(&dpcm->loopback->cable_lock); 364597603d6SJaroslav Kysela 365597603d6SJaroslav Kysela return 0; 366597603d6SJaroslav Kysela } 367597603d6SJaroslav Kysela 368597603d6SJaroslav Kysela static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes) 369597603d6SJaroslav Kysela { 370597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = dpcm->substream->runtime; 371597603d6SJaroslav Kysela char *dst = runtime->dma_area; 372597603d6SJaroslav Kysela unsigned int dst_off = dpcm->buf_pos; 373597603d6SJaroslav Kysela 374597603d6SJaroslav Kysela if (dpcm->silent_size >= dpcm->pcm_buffer_size) 375597603d6SJaroslav Kysela return; 376597603d6SJaroslav Kysela if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size) 377597603d6SJaroslav Kysela bytes = dpcm->pcm_buffer_size - dpcm->silent_size; 378597603d6SJaroslav Kysela 379597603d6SJaroslav Kysela for (;;) { 380597603d6SJaroslav Kysela unsigned int size = bytes; 381597603d6SJaroslav Kysela if (dst_off + size > dpcm->pcm_buffer_size) 382597603d6SJaroslav Kysela size = dpcm->pcm_buffer_size - dst_off; 383597603d6SJaroslav Kysela snd_pcm_format_set_silence(runtime->format, dst + dst_off, 384597603d6SJaroslav Kysela bytes_to_frames(runtime, size) * 385597603d6SJaroslav Kysela runtime->channels); 386597603d6SJaroslav Kysela dpcm->silent_size += size; 387597603d6SJaroslav Kysela bytes -= size; 388597603d6SJaroslav Kysela if (!bytes) 389597603d6SJaroslav Kysela break; 390597603d6SJaroslav Kysela dst_off = 0; 391597603d6SJaroslav Kysela } 392597603d6SJaroslav Kysela } 393597603d6SJaroslav Kysela 394597603d6SJaroslav Kysela static void copy_play_buf(struct loopback_pcm *play, 395597603d6SJaroslav Kysela struct loopback_pcm *capt, 396597603d6SJaroslav Kysela unsigned int bytes) 397597603d6SJaroslav Kysela { 398597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = play->substream->runtime; 39920d9a26dSJaroslav Kysela char *src = runtime->dma_area; 400597603d6SJaroslav Kysela char *dst = capt->substream->runtime->dma_area; 401597603d6SJaroslav Kysela unsigned int src_off = play->buf_pos; 402597603d6SJaroslav Kysela unsigned int dst_off = capt->buf_pos; 403597603d6SJaroslav Kysela unsigned int clear_bytes = 0; 404597603d6SJaroslav Kysela 405597603d6SJaroslav Kysela /* check if playback is draining, trim the capture copy size 406597603d6SJaroslav Kysela * when our pointer is at the end of playback ring buffer */ 407597603d6SJaroslav Kysela if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 408597603d6SJaroslav Kysela snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { 409597603d6SJaroslav Kysela snd_pcm_uframes_t appl_ptr, appl_ptr1, diff; 410597603d6SJaroslav Kysela appl_ptr = appl_ptr1 = runtime->control->appl_ptr; 411597603d6SJaroslav Kysela appl_ptr1 -= appl_ptr1 % runtime->buffer_size; 412597603d6SJaroslav Kysela appl_ptr1 += play->buf_pos / play->pcm_salign; 413597603d6SJaroslav Kysela if (appl_ptr < appl_ptr1) 414597603d6SJaroslav Kysela appl_ptr1 -= runtime->buffer_size; 415597603d6SJaroslav Kysela diff = (appl_ptr - appl_ptr1) * play->pcm_salign; 416597603d6SJaroslav Kysela if (diff < bytes) { 417597603d6SJaroslav Kysela clear_bytes = bytes - diff; 418597603d6SJaroslav Kysela bytes = diff; 419597603d6SJaroslav Kysela } 420597603d6SJaroslav Kysela } 421597603d6SJaroslav Kysela 422597603d6SJaroslav Kysela for (;;) { 423597603d6SJaroslav Kysela unsigned int size = bytes; 424597603d6SJaroslav Kysela if (src_off + size > play->pcm_buffer_size) 425597603d6SJaroslav Kysela size = play->pcm_buffer_size - src_off; 426597603d6SJaroslav Kysela if (dst_off + size > capt->pcm_buffer_size) 427597603d6SJaroslav Kysela size = capt->pcm_buffer_size - dst_off; 428597603d6SJaroslav Kysela memcpy(dst + dst_off, src + src_off, size); 429597603d6SJaroslav Kysela capt->silent_size = 0; 430597603d6SJaroslav Kysela bytes -= size; 431597603d6SJaroslav Kysela if (!bytes) 432597603d6SJaroslav Kysela break; 433597603d6SJaroslav Kysela src_off = (src_off + size) % play->pcm_buffer_size; 434597603d6SJaroslav Kysela dst_off = (dst_off + size) % capt->pcm_buffer_size; 435597603d6SJaroslav Kysela } 436597603d6SJaroslav Kysela 43720d9a26dSJaroslav Kysela if (clear_bytes > 0) { 438597603d6SJaroslav Kysela clear_capture_buf(capt, clear_bytes); 43920d9a26dSJaroslav Kysela capt->silent_size = 0; 44020d9a26dSJaroslav Kysela } 441597603d6SJaroslav Kysela } 442597603d6SJaroslav Kysela 443b012513cSJaroslav Kysela static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm, 444b012513cSJaroslav Kysela unsigned int jiffies_delta) 445597603d6SJaroslav Kysela { 446597603d6SJaroslav Kysela unsigned long last_pos; 447b012513cSJaroslav Kysela unsigned int delta; 448597603d6SJaroslav Kysela 449597603d6SJaroslav Kysela last_pos = byte_pos(dpcm, dpcm->irq_pos); 450b012513cSJaroslav Kysela dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps; 451b012513cSJaroslav Kysela delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos; 452b012513cSJaroslav Kysela if (delta >= dpcm->last_drift) 453b012513cSJaroslav Kysela delta -= dpcm->last_drift; 454b012513cSJaroslav Kysela dpcm->last_drift = 0; 455597603d6SJaroslav Kysela if (dpcm->irq_pos >= dpcm->period_size_frac) { 456597603d6SJaroslav Kysela dpcm->irq_pos %= dpcm->period_size_frac; 457597603d6SJaroslav Kysela dpcm->period_update_pending = 1; 458597603d6SJaroslav Kysela } 459b012513cSJaroslav Kysela return delta; 460b012513cSJaroslav Kysela } 461b012513cSJaroslav Kysela 462b012513cSJaroslav Kysela static inline void bytepos_finish(struct loopback_pcm *dpcm, 463b012513cSJaroslav Kysela unsigned int delta) 464b012513cSJaroslav Kysela { 465b012513cSJaroslav Kysela dpcm->buf_pos += delta; 466b012513cSJaroslav Kysela dpcm->buf_pos %= dpcm->pcm_buffer_size; 467597603d6SJaroslav Kysela } 468597603d6SJaroslav Kysela 469999fc9f6STakashi Iwai /* call in cable->lock */ 470dd04bb12SJaroslav Kysela static unsigned int loopback_pos_update(struct loopback_cable *cable) 471597603d6SJaroslav Kysela { 472597603d6SJaroslav Kysela struct loopback_pcm *dpcm_play = 473597603d6SJaroslav Kysela cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; 474597603d6SJaroslav Kysela struct loopback_pcm *dpcm_capt = 475597603d6SJaroslav Kysela cable->streams[SNDRV_PCM_STREAM_CAPTURE]; 476597603d6SJaroslav Kysela unsigned long delta_play = 0, delta_capt = 0; 477b012513cSJaroslav Kysela unsigned int running, count1, count2; 478597603d6SJaroslav Kysela 4795de9e45fSJaroslav Kysela running = cable->running ^ cable->pause; 480dd04bb12SJaroslav Kysela if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { 481597603d6SJaroslav Kysela delta_play = jiffies - dpcm_play->last_jiffies; 482597603d6SJaroslav Kysela dpcm_play->last_jiffies += delta_play; 483597603d6SJaroslav Kysela } 484597603d6SJaroslav Kysela 485dd04bb12SJaroslav Kysela if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { 486597603d6SJaroslav Kysela delta_capt = jiffies - dpcm_capt->last_jiffies; 487597603d6SJaroslav Kysela dpcm_capt->last_jiffies += delta_capt; 488597603d6SJaroslav Kysela } 489597603d6SJaroslav Kysela 49098d21df4STakashi Iwai if (delta_play == 0 && delta_capt == 0) 49198d21df4STakashi Iwai goto unlock; 492597603d6SJaroslav Kysela 493597603d6SJaroslav Kysela if (delta_play > delta_capt) { 494b012513cSJaroslav Kysela count1 = bytepos_delta(dpcm_play, delta_play - delta_capt); 495b012513cSJaroslav Kysela bytepos_finish(dpcm_play, count1); 496597603d6SJaroslav Kysela delta_play = delta_capt; 497597603d6SJaroslav Kysela } else if (delta_play < delta_capt) { 498b012513cSJaroslav Kysela count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play); 499b012513cSJaroslav Kysela clear_capture_buf(dpcm_capt, count1); 500b012513cSJaroslav Kysela bytepos_finish(dpcm_capt, count1); 501597603d6SJaroslav Kysela delta_capt = delta_play; 502597603d6SJaroslav Kysela } 503597603d6SJaroslav Kysela 50498d21df4STakashi Iwai if (delta_play == 0 && delta_capt == 0) 50598d21df4STakashi Iwai goto unlock; 50698d21df4STakashi Iwai 507597603d6SJaroslav Kysela /* note delta_capt == delta_play at this moment */ 508b012513cSJaroslav Kysela count1 = bytepos_delta(dpcm_play, delta_play); 509b012513cSJaroslav Kysela count2 = bytepos_delta(dpcm_capt, delta_capt); 510b012513cSJaroslav Kysela if (count1 < count2) { 511b012513cSJaroslav Kysela dpcm_capt->last_drift = count2 - count1; 512b012513cSJaroslav Kysela count1 = count2; 513b012513cSJaroslav Kysela } else if (count1 > count2) { 514b012513cSJaroslav Kysela dpcm_play->last_drift = count1 - count2; 515b012513cSJaroslav Kysela } 516b012513cSJaroslav Kysela copy_play_buf(dpcm_play, dpcm_capt, count1); 517b012513cSJaroslav Kysela bytepos_finish(dpcm_play, count1); 518b012513cSJaroslav Kysela bytepos_finish(dpcm_capt, count1); 51998d21df4STakashi Iwai unlock: 520dd04bb12SJaroslav Kysela return running; 521597603d6SJaroslav Kysela } 522597603d6SJaroslav Kysela 523bc47ba90SKees Cook static void loopback_timer_function(struct timer_list *t) 524597603d6SJaroslav Kysela { 525bc47ba90SKees Cook struct loopback_pcm *dpcm = from_timer(dpcm, t, timer); 526999fc9f6STakashi Iwai unsigned long flags; 527597603d6SJaroslav Kysela 528999fc9f6STakashi Iwai spin_lock_irqsave(&dpcm->cable->lock, flags); 529999fc9f6STakashi Iwai if (loopback_pos_update(dpcm->cable) & (1 << dpcm->substream->stream)) { 530597603d6SJaroslav Kysela loopback_timer_start(dpcm); 531597603d6SJaroslav Kysela if (dpcm->period_update_pending) { 532597603d6SJaroslav Kysela dpcm->period_update_pending = 0; 533999fc9f6STakashi Iwai spin_unlock_irqrestore(&dpcm->cable->lock, flags); 534999fc9f6STakashi Iwai /* need to unlock before calling below */ 535597603d6SJaroslav Kysela snd_pcm_period_elapsed(dpcm->substream); 536999fc9f6STakashi Iwai return; 537597603d6SJaroslav Kysela } 538597603d6SJaroslav Kysela } 539999fc9f6STakashi Iwai spin_unlock_irqrestore(&dpcm->cable->lock, flags); 540dd04bb12SJaroslav Kysela } 541597603d6SJaroslav Kysela 542597603d6SJaroslav Kysela static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream) 543597603d6SJaroslav Kysela { 544597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 545597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 546999fc9f6STakashi Iwai snd_pcm_uframes_t pos; 547597603d6SJaroslav Kysela 548999fc9f6STakashi Iwai spin_lock(&dpcm->cable->lock); 549597603d6SJaroslav Kysela loopback_pos_update(dpcm->cable); 550999fc9f6STakashi Iwai pos = dpcm->buf_pos; 551999fc9f6STakashi Iwai spin_unlock(&dpcm->cable->lock); 552999fc9f6STakashi Iwai return bytes_to_frames(runtime, pos); 553597603d6SJaroslav Kysela } 554597603d6SJaroslav Kysela 555b6c0b715SBhumika Goyal static const struct snd_pcm_hardware loopback_pcm_hardware = 556597603d6SJaroslav Kysela { 557597603d6SJaroslav Kysela .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | 558edac8943STakashi Iwai SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | 559edac8943STakashi Iwai SNDRV_PCM_INFO_RESUME), 560597603d6SJaroslav Kysela .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | 561597603d6SJaroslav Kysela SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | 562597603d6SJaroslav Kysela SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE), 563597603d6SJaroslav Kysela .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, 564597603d6SJaroslav Kysela .rate_min = 8000, 565597603d6SJaroslav Kysela .rate_max = 192000, 566597603d6SJaroslav Kysela .channels_min = 1, 567597603d6SJaroslav Kysela .channels_max = 32, 568597603d6SJaroslav Kysela .buffer_bytes_max = 2 * 1024 * 1024, 569597603d6SJaroslav Kysela .period_bytes_min = 64, 5700db71023SJaroslav Kysela /* note check overflow in frac_pos() using pcm_rate_shift before 5710db71023SJaroslav Kysela changing period_bytes_max value */ 5720db71023SJaroslav Kysela .period_bytes_max = 1024 * 1024, 573597603d6SJaroslav Kysela .periods_min = 1, 574597603d6SJaroslav Kysela .periods_max = 1024, 575597603d6SJaroslav Kysela .fifo_size = 0, 576597603d6SJaroslav Kysela }; 577597603d6SJaroslav Kysela 578597603d6SJaroslav Kysela static void loopback_runtime_free(struct snd_pcm_runtime *runtime) 579597603d6SJaroslav Kysela { 580597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 581597603d6SJaroslav Kysela kfree(dpcm); 582597603d6SJaroslav Kysela } 583597603d6SJaroslav Kysela 584597603d6SJaroslav Kysela static int loopback_hw_params(struct snd_pcm_substream *substream, 585597603d6SJaroslav Kysela struct snd_pcm_hw_params *params) 586597603d6SJaroslav Kysela { 5876b69a0e5STakashi Iwai return snd_pcm_lib_alloc_vmalloc_buffer(substream, 5886b69a0e5STakashi Iwai params_buffer_bytes(params)); 589597603d6SJaroslav Kysela } 590597603d6SJaroslav Kysela 591597603d6SJaroslav Kysela static int loopback_hw_free(struct snd_pcm_substream *substream) 592597603d6SJaroslav Kysela { 593597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 594597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 595597603d6SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 596597603d6SJaroslav Kysela 597597603d6SJaroslav Kysela mutex_lock(&dpcm->loopback->cable_lock); 598597603d6SJaroslav Kysela cable->valid &= ~(1 << substream->stream); 599597603d6SJaroslav Kysela mutex_unlock(&dpcm->loopback->cable_lock); 6006b69a0e5STakashi Iwai return snd_pcm_lib_free_vmalloc_buffer(substream); 601597603d6SJaroslav Kysela } 602597603d6SJaroslav Kysela 603597603d6SJaroslav Kysela static unsigned int get_cable_index(struct snd_pcm_substream *substream) 604597603d6SJaroslav Kysela { 605597603d6SJaroslav Kysela if (!substream->pcm->device) 606597603d6SJaroslav Kysela return substream->stream; 607597603d6SJaroslav Kysela else 608597603d6SJaroslav Kysela return !substream->stream; 609597603d6SJaroslav Kysela } 610597603d6SJaroslav Kysela 611b1c73fc8SJaroslav Kysela static int rule_format(struct snd_pcm_hw_params *params, 612b1c73fc8SJaroslav Kysela struct snd_pcm_hw_rule *rule) 613b1c73fc8SJaroslav Kysela { 614898dfe46STakashi Iwai struct loopback_pcm *dpcm = rule->private; 615898dfe46STakashi Iwai struct loopback_cable *cable = dpcm->cable; 616b088b53eSTakashi Iwai struct snd_mask m; 617b1c73fc8SJaroslav Kysela 618b088b53eSTakashi Iwai snd_mask_none(&m); 619898dfe46STakashi Iwai mutex_lock(&dpcm->loopback->cable_lock); 620898dfe46STakashi Iwai m.bits[0] = (u_int32_t)cable->hw.formats; 621898dfe46STakashi Iwai m.bits[1] = (u_int32_t)(cable->hw.formats >> 32); 622898dfe46STakashi Iwai mutex_unlock(&dpcm->loopback->cable_lock); 623b088b53eSTakashi Iwai return snd_mask_refine(hw_param_mask(params, rule->var), &m); 624b1c73fc8SJaroslav Kysela } 625b1c73fc8SJaroslav Kysela 626b1c73fc8SJaroslav Kysela static int rule_rate(struct snd_pcm_hw_params *params, 627b1c73fc8SJaroslav Kysela struct snd_pcm_hw_rule *rule) 628b1c73fc8SJaroslav Kysela { 629898dfe46STakashi Iwai struct loopback_pcm *dpcm = rule->private; 630898dfe46STakashi Iwai struct loopback_cable *cable = dpcm->cable; 631b1c73fc8SJaroslav Kysela struct snd_interval t; 632b1c73fc8SJaroslav Kysela 633898dfe46STakashi Iwai mutex_lock(&dpcm->loopback->cable_lock); 634898dfe46STakashi Iwai t.min = cable->hw.rate_min; 635898dfe46STakashi Iwai t.max = cable->hw.rate_max; 636898dfe46STakashi Iwai mutex_unlock(&dpcm->loopback->cable_lock); 637b1c73fc8SJaroslav Kysela t.openmin = t.openmax = 0; 638b1c73fc8SJaroslav Kysela t.integer = 0; 639b1c73fc8SJaroslav Kysela return snd_interval_refine(hw_param_interval(params, rule->var), &t); 640b1c73fc8SJaroslav Kysela } 641b1c73fc8SJaroslav Kysela 642b1c73fc8SJaroslav Kysela static int rule_channels(struct snd_pcm_hw_params *params, 643b1c73fc8SJaroslav Kysela struct snd_pcm_hw_rule *rule) 644b1c73fc8SJaroslav Kysela { 645898dfe46STakashi Iwai struct loopback_pcm *dpcm = rule->private; 646898dfe46STakashi Iwai struct loopback_cable *cable = dpcm->cable; 647b1c73fc8SJaroslav Kysela struct snd_interval t; 648b1c73fc8SJaroslav Kysela 649898dfe46STakashi Iwai mutex_lock(&dpcm->loopback->cable_lock); 650898dfe46STakashi Iwai t.min = cable->hw.channels_min; 651898dfe46STakashi Iwai t.max = cable->hw.channels_max; 652898dfe46STakashi Iwai mutex_unlock(&dpcm->loopback->cable_lock); 653b1c73fc8SJaroslav Kysela t.openmin = t.openmax = 0; 654b1c73fc8SJaroslav Kysela t.integer = 0; 655b1c73fc8SJaroslav Kysela return snd_interval_refine(hw_param_interval(params, rule->var), &t); 656b1c73fc8SJaroslav Kysela } 657b1c73fc8SJaroslav Kysela 6589685347aSTakashi Iwai static void free_cable(struct snd_pcm_substream *substream) 6599685347aSTakashi Iwai { 6609685347aSTakashi Iwai struct loopback *loopback = substream->private_data; 6619685347aSTakashi Iwai int dev = get_cable_index(substream); 6629685347aSTakashi Iwai struct loopback_cable *cable; 6639685347aSTakashi Iwai 6649685347aSTakashi Iwai cable = loopback->cables[substream->number][dev]; 6659685347aSTakashi Iwai if (!cable) 6669685347aSTakashi Iwai return; 6679685347aSTakashi Iwai if (cable->streams[!substream->stream]) { 6689685347aSTakashi Iwai /* other stream is still alive */ 6698e6b1a72STakashi Iwai spin_lock_irq(&cable->lock); 6709685347aSTakashi Iwai cable->streams[substream->stream] = NULL; 6718e6b1a72STakashi Iwai spin_unlock_irq(&cable->lock); 6729685347aSTakashi Iwai } else { 6739685347aSTakashi Iwai /* free the cable */ 6749685347aSTakashi Iwai loopback->cables[substream->number][dev] = NULL; 6759685347aSTakashi Iwai kfree(cable); 6769685347aSTakashi Iwai } 6779685347aSTakashi Iwai } 6789685347aSTakashi Iwai 679597603d6SJaroslav Kysela static int loopback_open(struct snd_pcm_substream *substream) 680597603d6SJaroslav Kysela { 681597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 682597603d6SJaroslav Kysela struct loopback *loopback = substream->private_data; 683597603d6SJaroslav Kysela struct loopback_pcm *dpcm; 6849685347aSTakashi Iwai struct loopback_cable *cable = NULL; 685597603d6SJaroslav Kysela int err = 0; 686597603d6SJaroslav Kysela int dev = get_cable_index(substream); 687597603d6SJaroslav Kysela 688597603d6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 689597603d6SJaroslav Kysela dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 690597603d6SJaroslav Kysela if (!dpcm) { 691597603d6SJaroslav Kysela err = -ENOMEM; 692597603d6SJaroslav Kysela goto unlock; 693597603d6SJaroslav Kysela } 694597603d6SJaroslav Kysela dpcm->loopback = loopback; 695597603d6SJaroslav Kysela dpcm->substream = substream; 696bc47ba90SKees Cook timer_setup(&dpcm->timer, loopback_timer_function, 0); 697597603d6SJaroslav Kysela 698597603d6SJaroslav Kysela cable = loopback->cables[substream->number][dev]; 699597603d6SJaroslav Kysela if (!cable) { 700597603d6SJaroslav Kysela cable = kzalloc(sizeof(*cable), GFP_KERNEL); 701597603d6SJaroslav Kysela if (!cable) { 702597603d6SJaroslav Kysela err = -ENOMEM; 703597603d6SJaroslav Kysela goto unlock; 704597603d6SJaroslav Kysela } 705597603d6SJaroslav Kysela spin_lock_init(&cable->lock); 706597603d6SJaroslav Kysela cable->hw = loopback_pcm_hardware; 707597603d6SJaroslav Kysela loopback->cables[substream->number][dev] = cable; 708597603d6SJaroslav Kysela } 709597603d6SJaroslav Kysela dpcm->cable = cable; 710597603d6SJaroslav Kysela 711597603d6SJaroslav Kysela snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 712597603d6SJaroslav Kysela 713b1c73fc8SJaroslav Kysela /* use dynamic rules based on actual runtime->hw values */ 714b1c73fc8SJaroslav Kysela /* note that the default rules created in the PCM midlevel code */ 715b1c73fc8SJaroslav Kysela /* are cached -> they do not reflect the actual state */ 716b1c73fc8SJaroslav Kysela err = snd_pcm_hw_rule_add(runtime, 0, 717b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_FORMAT, 718898dfe46STakashi Iwai rule_format, dpcm, 719b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_FORMAT, -1); 720b1c73fc8SJaroslav Kysela if (err < 0) 721b1c73fc8SJaroslav Kysela goto unlock; 722b1c73fc8SJaroslav Kysela err = snd_pcm_hw_rule_add(runtime, 0, 723b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_RATE, 724898dfe46STakashi Iwai rule_rate, dpcm, 725b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_RATE, -1); 726b1c73fc8SJaroslav Kysela if (err < 0) 727b1c73fc8SJaroslav Kysela goto unlock; 728b1c73fc8SJaroslav Kysela err = snd_pcm_hw_rule_add(runtime, 0, 729b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_CHANNELS, 730898dfe46STakashi Iwai rule_channels, dpcm, 731b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_CHANNELS, -1); 732b1c73fc8SJaroslav Kysela if (err < 0) 733b1c73fc8SJaroslav Kysela goto unlock; 734b1c73fc8SJaroslav Kysela 735597603d6SJaroslav Kysela runtime->private_data = dpcm; 736597603d6SJaroslav Kysela runtime->private_free = loopback_runtime_free; 737b1c73fc8SJaroslav Kysela if (get_notify(dpcm)) 738597603d6SJaroslav Kysela runtime->hw = loopback_pcm_hardware; 739b1c73fc8SJaroslav Kysela else 740597603d6SJaroslav Kysela runtime->hw = cable->hw; 7418e6b1a72STakashi Iwai 7428e6b1a72STakashi Iwai spin_lock_irq(&cable->lock); 7438e6b1a72STakashi Iwai cable->streams[substream->stream] = dpcm; 7448e6b1a72STakashi Iwai spin_unlock_irq(&cable->lock); 7458e6b1a72STakashi Iwai 746597603d6SJaroslav Kysela unlock: 7479685347aSTakashi Iwai if (err < 0) { 7489685347aSTakashi Iwai free_cable(substream); 7499685347aSTakashi Iwai kfree(dpcm); 7509685347aSTakashi Iwai } 751597603d6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 752597603d6SJaroslav Kysela return err; 753597603d6SJaroslav Kysela } 754597603d6SJaroslav Kysela 755597603d6SJaroslav Kysela static int loopback_close(struct snd_pcm_substream *substream) 756597603d6SJaroslav Kysela { 757597603d6SJaroslav Kysela struct loopback *loopback = substream->private_data; 758597603d6SJaroslav Kysela struct loopback_pcm *dpcm = substream->runtime->private_data; 759597603d6SJaroslav Kysela 76067a01afaSTakashi Iwai loopback_timer_stop_sync(dpcm); 761597603d6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 7629685347aSTakashi Iwai free_cable(substream); 763597603d6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 764597603d6SJaroslav Kysela return 0; 765597603d6SJaroslav Kysela } 766597603d6SJaroslav Kysela 767f9592582SArvind Yadav static const struct snd_pcm_ops loopback_playback_ops = { 768597603d6SJaroslav Kysela .open = loopback_open, 769597603d6SJaroslav Kysela .close = loopback_close, 770597603d6SJaroslav Kysela .ioctl = snd_pcm_lib_ioctl, 771597603d6SJaroslav Kysela .hw_params = loopback_hw_params, 772597603d6SJaroslav Kysela .hw_free = loopback_hw_free, 773597603d6SJaroslav Kysela .prepare = loopback_prepare, 774597603d6SJaroslav Kysela .trigger = loopback_trigger, 775597603d6SJaroslav Kysela .pointer = loopback_pointer, 7766b69a0e5STakashi Iwai .page = snd_pcm_lib_get_vmalloc_page, 7776b69a0e5STakashi Iwai .mmap = snd_pcm_lib_mmap_vmalloc, 778597603d6SJaroslav Kysela }; 779597603d6SJaroslav Kysela 780f9592582SArvind Yadav static const struct snd_pcm_ops loopback_capture_ops = { 781597603d6SJaroslav Kysela .open = loopback_open, 782597603d6SJaroslav Kysela .close = loopback_close, 783597603d6SJaroslav Kysela .ioctl = snd_pcm_lib_ioctl, 784597603d6SJaroslav Kysela .hw_params = loopback_hw_params, 785597603d6SJaroslav Kysela .hw_free = loopback_hw_free, 786597603d6SJaroslav Kysela .prepare = loopback_prepare, 787597603d6SJaroslav Kysela .trigger = loopback_trigger, 788597603d6SJaroslav Kysela .pointer = loopback_pointer, 7896b69a0e5STakashi Iwai .page = snd_pcm_lib_get_vmalloc_page, 7906b69a0e5STakashi Iwai .mmap = snd_pcm_lib_mmap_vmalloc, 791597603d6SJaroslav Kysela }; 792597603d6SJaroslav Kysela 793fbbb01a1SBill Pemberton static int loopback_pcm_new(struct loopback *loopback, 794597603d6SJaroslav Kysela int device, int substreams) 795597603d6SJaroslav Kysela { 796597603d6SJaroslav Kysela struct snd_pcm *pcm; 797597603d6SJaroslav Kysela int err; 798597603d6SJaroslav Kysela 799597603d6SJaroslav Kysela err = snd_pcm_new(loopback->card, "Loopback PCM", device, 800597603d6SJaroslav Kysela substreams, substreams, &pcm); 801597603d6SJaroslav Kysela if (err < 0) 802597603d6SJaroslav Kysela return err; 803597603d6SJaroslav Kysela snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_playback_ops); 804597603d6SJaroslav Kysela snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_capture_ops); 805597603d6SJaroslav Kysela 806597603d6SJaroslav Kysela pcm->private_data = loopback; 807597603d6SJaroslav Kysela pcm->info_flags = 0; 808597603d6SJaroslav Kysela strcpy(pcm->name, "Loopback PCM"); 809597603d6SJaroslav Kysela 810597603d6SJaroslav Kysela loopback->pcm[device] = pcm; 811597603d6SJaroslav Kysela return 0; 812597603d6SJaroslav Kysela } 813597603d6SJaroslav Kysela 814597603d6SJaroslav Kysela static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol, 815597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 816597603d6SJaroslav Kysela { 817597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 818597603d6SJaroslav Kysela uinfo->count = 1; 819597603d6SJaroslav Kysela uinfo->value.integer.min = 80000; 820597603d6SJaroslav Kysela uinfo->value.integer.max = 120000; 821597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 822597603d6SJaroslav Kysela return 0; 823597603d6SJaroslav Kysela } 824597603d6SJaroslav Kysela 825597603d6SJaroslav Kysela static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol, 826597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 827597603d6SJaroslav Kysela { 828597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 829597603d6SJaroslav Kysela 830597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 831597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 832597603d6SJaroslav Kysela [kcontrol->id.device].rate_shift; 833597603d6SJaroslav Kysela return 0; 834597603d6SJaroslav Kysela } 835597603d6SJaroslav Kysela 836597603d6SJaroslav Kysela static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol, 837597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 838597603d6SJaroslav Kysela { 839597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 840597603d6SJaroslav Kysela unsigned int val; 841597603d6SJaroslav Kysela int change = 0; 842597603d6SJaroslav Kysela 843597603d6SJaroslav Kysela val = ucontrol->value.integer.value[0]; 844597603d6SJaroslav Kysela if (val < 80000) 845597603d6SJaroslav Kysela val = 80000; 846597603d6SJaroslav Kysela if (val > 120000) 847597603d6SJaroslav Kysela val = 120000; 848597603d6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 849597603d6SJaroslav Kysela if (val != loopback->setup[kcontrol->id.subdevice] 850597603d6SJaroslav Kysela [kcontrol->id.device].rate_shift) { 851597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 852597603d6SJaroslav Kysela [kcontrol->id.device].rate_shift = val; 853597603d6SJaroslav Kysela change = 1; 854597603d6SJaroslav Kysela } 855597603d6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 856597603d6SJaroslav Kysela return change; 857597603d6SJaroslav Kysela } 858597603d6SJaroslav Kysela 859597603d6SJaroslav Kysela static int loopback_notify_get(struct snd_kcontrol *kcontrol, 860597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 861597603d6SJaroslav Kysela { 862597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 863597603d6SJaroslav Kysela 864597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 865597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 866597603d6SJaroslav Kysela [kcontrol->id.device].notify; 867597603d6SJaroslav Kysela return 0; 868597603d6SJaroslav Kysela } 869597603d6SJaroslav Kysela 870597603d6SJaroslav Kysela static int loopback_notify_put(struct snd_kcontrol *kcontrol, 871597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 872597603d6SJaroslav Kysela { 873597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 874597603d6SJaroslav Kysela unsigned int val; 875597603d6SJaroslav Kysela int change = 0; 876597603d6SJaroslav Kysela 877597603d6SJaroslav Kysela val = ucontrol->value.integer.value[0] ? 1 : 0; 878597603d6SJaroslav Kysela if (val != loopback->setup[kcontrol->id.subdevice] 879597603d6SJaroslav Kysela [kcontrol->id.device].notify) { 880597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 881597603d6SJaroslav Kysela [kcontrol->id.device].notify = val; 882597603d6SJaroslav Kysela change = 1; 883597603d6SJaroslav Kysela } 884597603d6SJaroslav Kysela return change; 885597603d6SJaroslav Kysela } 886597603d6SJaroslav Kysela 887597603d6SJaroslav Kysela static int loopback_active_get(struct snd_kcontrol *kcontrol, 888597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 889597603d6SJaroslav Kysela { 890597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 891597603d6SJaroslav Kysela struct loopback_cable *cable = loopback->cables 892ac446fb7SJaroslav Kysela [kcontrol->id.subdevice][kcontrol->id.device ^ 1]; 893597603d6SJaroslav Kysela unsigned int val = 0; 894597603d6SJaroslav Kysela 895597603d6SJaroslav Kysela if (cable != NULL) 896597603d6SJaroslav Kysela val = (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? 897597603d6SJaroslav Kysela 1 : 0; 898597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = val; 899597603d6SJaroslav Kysela return 0; 900597603d6SJaroslav Kysela } 901597603d6SJaroslav Kysela 902597603d6SJaroslav Kysela static int loopback_format_info(struct snd_kcontrol *kcontrol, 903597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 904597603d6SJaroslav Kysela { 905597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 906597603d6SJaroslav Kysela uinfo->count = 1; 907597603d6SJaroslav Kysela uinfo->value.integer.min = 0; 908597603d6SJaroslav Kysela uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST; 909597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 910597603d6SJaroslav Kysela return 0; 911597603d6SJaroslav Kysela } 912597603d6SJaroslav Kysela 913597603d6SJaroslav Kysela static int loopback_format_get(struct snd_kcontrol *kcontrol, 914597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 915597603d6SJaroslav Kysela { 916597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 917597603d6SJaroslav Kysela 918597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 919597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 920597603d6SJaroslav Kysela [kcontrol->id.device].format; 921597603d6SJaroslav Kysela return 0; 922597603d6SJaroslav Kysela } 923597603d6SJaroslav Kysela 924597603d6SJaroslav Kysela static int loopback_rate_info(struct snd_kcontrol *kcontrol, 925597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 926597603d6SJaroslav Kysela { 927597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 928597603d6SJaroslav Kysela uinfo->count = 1; 929597603d6SJaroslav Kysela uinfo->value.integer.min = 0; 930597603d6SJaroslav Kysela uinfo->value.integer.max = 192000; 931597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 932597603d6SJaroslav Kysela return 0; 933597603d6SJaroslav Kysela } 934597603d6SJaroslav Kysela 935597603d6SJaroslav Kysela static int loopback_rate_get(struct snd_kcontrol *kcontrol, 936597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 937597603d6SJaroslav Kysela { 938597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 939597603d6SJaroslav Kysela 940597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 941597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 942597603d6SJaroslav Kysela [kcontrol->id.device].rate; 943597603d6SJaroslav Kysela return 0; 944597603d6SJaroslav Kysela } 945597603d6SJaroslav Kysela 946597603d6SJaroslav Kysela static int loopback_channels_info(struct snd_kcontrol *kcontrol, 947597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 948597603d6SJaroslav Kysela { 949597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 950597603d6SJaroslav Kysela uinfo->count = 1; 951597603d6SJaroslav Kysela uinfo->value.integer.min = 1; 952597603d6SJaroslav Kysela uinfo->value.integer.max = 1024; 953597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 954597603d6SJaroslav Kysela return 0; 955597603d6SJaroslav Kysela } 956597603d6SJaroslav Kysela 957597603d6SJaroslav Kysela static int loopback_channels_get(struct snd_kcontrol *kcontrol, 958597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 959597603d6SJaroslav Kysela { 960597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 961597603d6SJaroslav Kysela 962597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 963597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 9641446c5fbSJaroslav Kysela [kcontrol->id.device].channels; 965597603d6SJaroslav Kysela return 0; 966597603d6SJaroslav Kysela } 967597603d6SJaroslav Kysela 968fbbb01a1SBill Pemberton static struct snd_kcontrol_new loopback_controls[] = { 969597603d6SJaroslav Kysela { 970597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 971597603d6SJaroslav Kysela .name = "PCM Rate Shift 100000", 972597603d6SJaroslav Kysela .info = loopback_rate_shift_info, 973597603d6SJaroslav Kysela .get = loopback_rate_shift_get, 974597603d6SJaroslav Kysela .put = loopback_rate_shift_put, 975597603d6SJaroslav Kysela }, 976597603d6SJaroslav Kysela { 977597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 978597603d6SJaroslav Kysela .name = "PCM Notify", 979597603d6SJaroslav Kysela .info = snd_ctl_boolean_mono_info, 980597603d6SJaroslav Kysela .get = loopback_notify_get, 981597603d6SJaroslav Kysela .put = loopback_notify_put, 982597603d6SJaroslav Kysela }, 983597603d6SJaroslav Kysela #define ACTIVE_IDX 2 984597603d6SJaroslav Kysela { 985597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 986597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 987597603d6SJaroslav Kysela .name = "PCM Slave Active", 988597603d6SJaroslav Kysela .info = snd_ctl_boolean_mono_info, 989597603d6SJaroslav Kysela .get = loopback_active_get, 990597603d6SJaroslav Kysela }, 991597603d6SJaroslav Kysela #define FORMAT_IDX 3 992597603d6SJaroslav Kysela { 993597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 994597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 995597603d6SJaroslav Kysela .name = "PCM Slave Format", 996597603d6SJaroslav Kysela .info = loopback_format_info, 997597603d6SJaroslav Kysela .get = loopback_format_get 998597603d6SJaroslav Kysela }, 999597603d6SJaroslav Kysela #define RATE_IDX 4 1000597603d6SJaroslav Kysela { 1001597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 1002597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 1003597603d6SJaroslav Kysela .name = "PCM Slave Rate", 1004597603d6SJaroslav Kysela .info = loopback_rate_info, 1005597603d6SJaroslav Kysela .get = loopback_rate_get 1006597603d6SJaroslav Kysela }, 1007597603d6SJaroslav Kysela #define CHANNELS_IDX 5 1008597603d6SJaroslav Kysela { 1009597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 1010597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 1011597603d6SJaroslav Kysela .name = "PCM Slave Channels", 1012597603d6SJaroslav Kysela .info = loopback_channels_info, 1013597603d6SJaroslav Kysela .get = loopback_channels_get 1014597603d6SJaroslav Kysela } 1015597603d6SJaroslav Kysela }; 1016597603d6SJaroslav Kysela 1017fbbb01a1SBill Pemberton static int loopback_mixer_new(struct loopback *loopback, int notify) 1018597603d6SJaroslav Kysela { 1019597603d6SJaroslav Kysela struct snd_card *card = loopback->card; 1020597603d6SJaroslav Kysela struct snd_pcm *pcm; 1021597603d6SJaroslav Kysela struct snd_kcontrol *kctl; 1022597603d6SJaroslav Kysela struct loopback_setup *setup; 1023597603d6SJaroslav Kysela int err, dev, substr, substr_count, idx; 1024597603d6SJaroslav Kysela 1025597603d6SJaroslav Kysela strcpy(card->mixername, "Loopback Mixer"); 1026597603d6SJaroslav Kysela for (dev = 0; dev < 2; dev++) { 1027597603d6SJaroslav Kysela pcm = loopback->pcm[dev]; 1028597603d6SJaroslav Kysela substr_count = 1029597603d6SJaroslav Kysela pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count; 1030597603d6SJaroslav Kysela for (substr = 0; substr < substr_count; substr++) { 1031597603d6SJaroslav Kysela setup = &loopback->setup[substr][dev]; 1032597603d6SJaroslav Kysela setup->notify = notify; 1033597603d6SJaroslav Kysela setup->rate_shift = NO_PITCH; 1034597603d6SJaroslav Kysela setup->format = SNDRV_PCM_FORMAT_S16_LE; 1035597603d6SJaroslav Kysela setup->rate = 48000; 1036597603d6SJaroslav Kysela setup->channels = 2; 1037597603d6SJaroslav Kysela for (idx = 0; idx < ARRAY_SIZE(loopback_controls); 1038597603d6SJaroslav Kysela idx++) { 1039597603d6SJaroslav Kysela kctl = snd_ctl_new1(&loopback_controls[idx], 1040597603d6SJaroslav Kysela loopback); 1041597603d6SJaroslav Kysela if (!kctl) 1042597603d6SJaroslav Kysela return -ENOMEM; 1043597603d6SJaroslav Kysela kctl->id.device = dev; 1044597603d6SJaroslav Kysela kctl->id.subdevice = substr; 1045597603d6SJaroslav Kysela switch (idx) { 1046597603d6SJaroslav Kysela case ACTIVE_IDX: 1047597603d6SJaroslav Kysela setup->active_id = kctl->id; 1048597603d6SJaroslav Kysela break; 1049597603d6SJaroslav Kysela case FORMAT_IDX: 1050597603d6SJaroslav Kysela setup->format_id = kctl->id; 1051597603d6SJaroslav Kysela break; 1052597603d6SJaroslav Kysela case RATE_IDX: 1053597603d6SJaroslav Kysela setup->rate_id = kctl->id; 1054597603d6SJaroslav Kysela break; 1055597603d6SJaroslav Kysela case CHANNELS_IDX: 1056597603d6SJaroslav Kysela setup->channels_id = kctl->id; 1057597603d6SJaroslav Kysela break; 1058597603d6SJaroslav Kysela default: 1059597603d6SJaroslav Kysela break; 1060597603d6SJaroslav Kysela } 1061597603d6SJaroslav Kysela err = snd_ctl_add(card, kctl); 1062597603d6SJaroslav Kysela if (err < 0) 1063597603d6SJaroslav Kysela return err; 1064597603d6SJaroslav Kysela } 1065597603d6SJaroslav Kysela } 1066597603d6SJaroslav Kysela } 1067597603d6SJaroslav Kysela return 0; 1068597603d6SJaroslav Kysela } 1069597603d6SJaroslav Kysela 1070e74670b6SJaroslav Kysela static void print_dpcm_info(struct snd_info_buffer *buffer, 1071e74670b6SJaroslav Kysela struct loopback_pcm *dpcm, 1072e74670b6SJaroslav Kysela const char *id) 1073e74670b6SJaroslav Kysela { 1074e74670b6SJaroslav Kysela snd_iprintf(buffer, " %s\n", id); 1075e74670b6SJaroslav Kysela if (dpcm == NULL) { 1076e74670b6SJaroslav Kysela snd_iprintf(buffer, " inactive\n"); 1077e74670b6SJaroslav Kysela return; 1078e74670b6SJaroslav Kysela } 1079e74670b6SJaroslav Kysela snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size); 1080e74670b6SJaroslav Kysela snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos); 1081e74670b6SJaroslav Kysela snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size); 1082e74670b6SJaroslav Kysela snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size); 1083e74670b6SJaroslav Kysela snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps); 1084e74670b6SJaroslav Kysela snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign); 1085e74670b6SJaroslav Kysela snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift); 1086e74670b6SJaroslav Kysela snd_iprintf(buffer, " update_pending:\t%u\n", 1087e74670b6SJaroslav Kysela dpcm->period_update_pending); 1088e74670b6SJaroslav Kysela snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos); 1089e74670b6SJaroslav Kysela snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac); 1090e74670b6SJaroslav Kysela snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n", 1091e74670b6SJaroslav Kysela dpcm->last_jiffies, jiffies); 1092e74670b6SJaroslav Kysela snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires); 1093e74670b6SJaroslav Kysela } 1094e74670b6SJaroslav Kysela 1095e74670b6SJaroslav Kysela static void print_substream_info(struct snd_info_buffer *buffer, 1096e74670b6SJaroslav Kysela struct loopback *loopback, 1097e74670b6SJaroslav Kysela int sub, 1098e74670b6SJaroslav Kysela int num) 1099e74670b6SJaroslav Kysela { 1100e74670b6SJaroslav Kysela struct loopback_cable *cable = loopback->cables[sub][num]; 1101e74670b6SJaroslav Kysela 1102e74670b6SJaroslav Kysela snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub); 1103e74670b6SJaroslav Kysela if (cable == NULL) { 1104e74670b6SJaroslav Kysela snd_iprintf(buffer, " inactive\n"); 1105e74670b6SJaroslav Kysela return; 1106e74670b6SJaroslav Kysela } 1107e74670b6SJaroslav Kysela snd_iprintf(buffer, " valid: %u\n", cable->valid); 1108e74670b6SJaroslav Kysela snd_iprintf(buffer, " running: %u\n", cable->running); 11095de9e45fSJaroslav Kysela snd_iprintf(buffer, " pause: %u\n", cable->pause); 1110e74670b6SJaroslav Kysela print_dpcm_info(buffer, cable->streams[0], "Playback"); 1111e74670b6SJaroslav Kysela print_dpcm_info(buffer, cable->streams[1], "Capture"); 1112e74670b6SJaroslav Kysela } 1113e74670b6SJaroslav Kysela 1114e74670b6SJaroslav Kysela static void print_cable_info(struct snd_info_entry *entry, 1115e74670b6SJaroslav Kysela struct snd_info_buffer *buffer) 1116e74670b6SJaroslav Kysela { 1117e74670b6SJaroslav Kysela struct loopback *loopback = entry->private_data; 1118e74670b6SJaroslav Kysela int sub, num; 1119e74670b6SJaroslav Kysela 1120e74670b6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 1121e74670b6SJaroslav Kysela num = entry->name[strlen(entry->name)-1]; 1122e74670b6SJaroslav Kysela num = num == '0' ? 0 : 1; 1123e74670b6SJaroslav Kysela for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++) 1124e74670b6SJaroslav Kysela print_substream_info(buffer, loopback, sub, num); 1125e74670b6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 1126e74670b6SJaroslav Kysela } 1127e74670b6SJaroslav Kysela 1128fbbb01a1SBill Pemberton static int loopback_proc_new(struct loopback *loopback, int cidx) 1129e74670b6SJaroslav Kysela { 1130e74670b6SJaroslav Kysela char name[32]; 1131e74670b6SJaroslav Kysela struct snd_info_entry *entry; 1132e74670b6SJaroslav Kysela int err; 1133e74670b6SJaroslav Kysela 1134e74670b6SJaroslav Kysela snprintf(name, sizeof(name), "cable#%d", cidx); 1135e74670b6SJaroslav Kysela err = snd_card_proc_new(loopback->card, name, &entry); 1136e74670b6SJaroslav Kysela if (err < 0) 1137e74670b6SJaroslav Kysela return err; 1138e74670b6SJaroslav Kysela 1139e74670b6SJaroslav Kysela snd_info_set_text_ops(entry, loopback, print_cable_info); 1140e74670b6SJaroslav Kysela return 0; 1141e74670b6SJaroslav Kysela } 1142e74670b6SJaroslav Kysela 1143fbbb01a1SBill Pemberton static int loopback_probe(struct platform_device *devptr) 1144597603d6SJaroslav Kysela { 1145597603d6SJaroslav Kysela struct snd_card *card; 1146597603d6SJaroslav Kysela struct loopback *loopback; 1147597603d6SJaroslav Kysela int dev = devptr->id; 1148597603d6SJaroslav Kysela int err; 1149597603d6SJaroslav Kysela 11505872f3f6STakashi Iwai err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE, 1151597603d6SJaroslav Kysela sizeof(struct loopback), &card); 1152597603d6SJaroslav Kysela if (err < 0) 1153597603d6SJaroslav Kysela return err; 1154597603d6SJaroslav Kysela loopback = card->private_data; 1155597603d6SJaroslav Kysela 1156597603d6SJaroslav Kysela if (pcm_substreams[dev] < 1) 1157597603d6SJaroslav Kysela pcm_substreams[dev] = 1; 1158597603d6SJaroslav Kysela if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) 1159597603d6SJaroslav Kysela pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; 1160597603d6SJaroslav Kysela 1161597603d6SJaroslav Kysela loopback->card = card; 1162597603d6SJaroslav Kysela mutex_init(&loopback->cable_lock); 1163597603d6SJaroslav Kysela 1164597603d6SJaroslav Kysela err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]); 1165597603d6SJaroslav Kysela if (err < 0) 1166597603d6SJaroslav Kysela goto __nodev; 1167597603d6SJaroslav Kysela err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]); 1168597603d6SJaroslav Kysela if (err < 0) 1169597603d6SJaroslav Kysela goto __nodev; 1170597603d6SJaroslav Kysela err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0); 1171597603d6SJaroslav Kysela if (err < 0) 1172597603d6SJaroslav Kysela goto __nodev; 1173e74670b6SJaroslav Kysela loopback_proc_new(loopback, 0); 1174e74670b6SJaroslav Kysela loopback_proc_new(loopback, 1); 1175597603d6SJaroslav Kysela strcpy(card->driver, "Loopback"); 1176597603d6SJaroslav Kysela strcpy(card->shortname, "Loopback"); 1177597603d6SJaroslav Kysela sprintf(card->longname, "Loopback %i", dev + 1); 1178597603d6SJaroslav Kysela err = snd_card_register(card); 1179597603d6SJaroslav Kysela if (!err) { 1180597603d6SJaroslav Kysela platform_set_drvdata(devptr, card); 1181597603d6SJaroslav Kysela return 0; 1182597603d6SJaroslav Kysela } 1183597603d6SJaroslav Kysela __nodev: 1184597603d6SJaroslav Kysela snd_card_free(card); 1185597603d6SJaroslav Kysela return err; 1186597603d6SJaroslav Kysela } 1187597603d6SJaroslav Kysela 1188fbbb01a1SBill Pemberton static int loopback_remove(struct platform_device *devptr) 1189597603d6SJaroslav Kysela { 1190597603d6SJaroslav Kysela snd_card_free(platform_get_drvdata(devptr)); 1191597603d6SJaroslav Kysela return 0; 1192597603d6SJaroslav Kysela } 1193597603d6SJaroslav Kysela 1194d34e4e00STakashi Iwai #ifdef CONFIG_PM_SLEEP 1195284e7ca7STakashi Iwai static int loopback_suspend(struct device *pdev) 1196597603d6SJaroslav Kysela { 1197284e7ca7STakashi Iwai struct snd_card *card = dev_get_drvdata(pdev); 1198597603d6SJaroslav Kysela struct loopback *loopback = card->private_data; 1199597603d6SJaroslav Kysela 1200597603d6SJaroslav Kysela snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 1201597603d6SJaroslav Kysela 1202597603d6SJaroslav Kysela snd_pcm_suspend_all(loopback->pcm[0]); 1203597603d6SJaroslav Kysela snd_pcm_suspend_all(loopback->pcm[1]); 1204597603d6SJaroslav Kysela return 0; 1205597603d6SJaroslav Kysela } 1206597603d6SJaroslav Kysela 1207284e7ca7STakashi Iwai static int loopback_resume(struct device *pdev) 1208597603d6SJaroslav Kysela { 1209284e7ca7STakashi Iwai struct snd_card *card = dev_get_drvdata(pdev); 1210597603d6SJaroslav Kysela 1211597603d6SJaroslav Kysela snd_power_change_state(card, SNDRV_CTL_POWER_D0); 1212597603d6SJaroslav Kysela return 0; 1213597603d6SJaroslav Kysela } 1214284e7ca7STakashi Iwai 1215284e7ca7STakashi Iwai static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume); 1216284e7ca7STakashi Iwai #define LOOPBACK_PM_OPS &loopback_pm 1217284e7ca7STakashi Iwai #else 1218284e7ca7STakashi Iwai #define LOOPBACK_PM_OPS NULL 1219597603d6SJaroslav Kysela #endif 1220597603d6SJaroslav Kysela 1221597603d6SJaroslav Kysela #define SND_LOOPBACK_DRIVER "snd_aloop" 1222597603d6SJaroslav Kysela 1223597603d6SJaroslav Kysela static struct platform_driver loopback_driver = { 1224597603d6SJaroslav Kysela .probe = loopback_probe, 1225fbbb01a1SBill Pemberton .remove = loopback_remove, 1226597603d6SJaroslav Kysela .driver = { 12278bf01d8aSTakashi Iwai .name = SND_LOOPBACK_DRIVER, 1228284e7ca7STakashi Iwai .pm = LOOPBACK_PM_OPS, 1229597603d6SJaroslav Kysela }, 1230597603d6SJaroslav Kysela }; 1231597603d6SJaroslav Kysela 1232597603d6SJaroslav Kysela static void loopback_unregister_all(void) 1233597603d6SJaroslav Kysela { 1234597603d6SJaroslav Kysela int i; 1235597603d6SJaroslav Kysela 1236597603d6SJaroslav Kysela for (i = 0; i < ARRAY_SIZE(devices); ++i) 1237597603d6SJaroslav Kysela platform_device_unregister(devices[i]); 1238597603d6SJaroslav Kysela platform_driver_unregister(&loopback_driver); 1239597603d6SJaroslav Kysela } 1240597603d6SJaroslav Kysela 1241597603d6SJaroslav Kysela static int __init alsa_card_loopback_init(void) 1242597603d6SJaroslav Kysela { 1243597603d6SJaroslav Kysela int i, err, cards; 1244597603d6SJaroslav Kysela 1245597603d6SJaroslav Kysela err = platform_driver_register(&loopback_driver); 1246597603d6SJaroslav Kysela if (err < 0) 1247597603d6SJaroslav Kysela return err; 1248597603d6SJaroslav Kysela 1249597603d6SJaroslav Kysela 1250597603d6SJaroslav Kysela cards = 0; 1251597603d6SJaroslav Kysela for (i = 0; i < SNDRV_CARDS; i++) { 1252597603d6SJaroslav Kysela struct platform_device *device; 1253597603d6SJaroslav Kysela if (!enable[i]) 1254597603d6SJaroslav Kysela continue; 1255597603d6SJaroslav Kysela device = platform_device_register_simple(SND_LOOPBACK_DRIVER, 1256597603d6SJaroslav Kysela i, NULL, 0); 1257597603d6SJaroslav Kysela if (IS_ERR(device)) 1258597603d6SJaroslav Kysela continue; 1259597603d6SJaroslav Kysela if (!platform_get_drvdata(device)) { 1260597603d6SJaroslav Kysela platform_device_unregister(device); 1261597603d6SJaroslav Kysela continue; 1262597603d6SJaroslav Kysela } 1263597603d6SJaroslav Kysela devices[i] = device; 1264597603d6SJaroslav Kysela cards++; 1265597603d6SJaroslav Kysela } 1266597603d6SJaroslav Kysela if (!cards) { 1267597603d6SJaroslav Kysela #ifdef MODULE 1268597603d6SJaroslav Kysela printk(KERN_ERR "aloop: No loopback enabled\n"); 1269597603d6SJaroslav Kysela #endif 1270597603d6SJaroslav Kysela loopback_unregister_all(); 1271597603d6SJaroslav Kysela return -ENODEV; 1272597603d6SJaroslav Kysela } 1273597603d6SJaroslav Kysela return 0; 1274597603d6SJaroslav Kysela } 1275597603d6SJaroslav Kysela 1276597603d6SJaroslav Kysela static void __exit alsa_card_loopback_exit(void) 1277597603d6SJaroslav Kysela { 1278597603d6SJaroslav Kysela loopback_unregister_all(); 1279597603d6SJaroslav Kysela } 1280597603d6SJaroslav Kysela 1281597603d6SJaroslav Kysela module_init(alsa_card_loopback_init) 1282597603d6SJaroslav Kysela module_exit(alsa_card_loopback_exit) 1283