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: 289edac8943STakashi Iwai case SNDRV_PCM_TRIGGER_SUSPEND: 2905de9e45fSJaroslav Kysela spin_lock(&cable->lock); 2915de9e45fSJaroslav Kysela cable->pause |= stream; 2925de9e45fSJaroslav Kysela loopback_timer_stop(dpcm); 293999fc9f6STakashi Iwai spin_unlock(&cable->lock); 2945de9e45fSJaroslav Kysela break; 2955de9e45fSJaroslav Kysela case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 296edac8943STakashi Iwai case SNDRV_PCM_TRIGGER_RESUME: 2975de9e45fSJaroslav Kysela spin_lock(&cable->lock); 2985de9e45fSJaroslav Kysela dpcm->last_jiffies = jiffies; 2995de9e45fSJaroslav Kysela cable->pause &= ~stream; 3005de9e45fSJaroslav Kysela loopback_timer_start(dpcm); 301999fc9f6STakashi Iwai spin_unlock(&cable->lock); 3025de9e45fSJaroslav Kysela break; 303597603d6SJaroslav Kysela default: 304597603d6SJaroslav Kysela return -EINVAL; 305597603d6SJaroslav Kysela } 306597603d6SJaroslav Kysela return 0; 307597603d6SJaroslav Kysela } 308597603d6SJaroslav Kysela 309b1c73fc8SJaroslav Kysela static void params_change_substream(struct loopback_pcm *dpcm, 310b1c73fc8SJaroslav Kysela struct snd_pcm_runtime *runtime) 311b1c73fc8SJaroslav Kysela { 312b1c73fc8SJaroslav Kysela struct snd_pcm_runtime *dst_runtime; 313b1c73fc8SJaroslav Kysela 314b1c73fc8SJaroslav Kysela if (dpcm == NULL || dpcm->substream == NULL) 315b1c73fc8SJaroslav Kysela return; 316b1c73fc8SJaroslav Kysela dst_runtime = dpcm->substream->runtime; 317b1c73fc8SJaroslav Kysela if (dst_runtime == NULL) 318b1c73fc8SJaroslav Kysela return; 319b1c73fc8SJaroslav Kysela dst_runtime->hw = dpcm->cable->hw; 320b1c73fc8SJaroslav Kysela } 321b1c73fc8SJaroslav Kysela 322b1c73fc8SJaroslav Kysela static void params_change(struct snd_pcm_substream *substream) 323b1c73fc8SJaroslav Kysela { 324b1c73fc8SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 325b1c73fc8SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 326b1c73fc8SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 327b1c73fc8SJaroslav Kysela 328b1c73fc8SJaroslav Kysela cable->hw.formats = (1ULL << runtime->format); 329b1c73fc8SJaroslav Kysela cable->hw.rate_min = runtime->rate; 330b1c73fc8SJaroslav Kysela cable->hw.rate_max = runtime->rate; 331b1c73fc8SJaroslav Kysela cable->hw.channels_min = runtime->channels; 332b1c73fc8SJaroslav Kysela cable->hw.channels_max = runtime->channels; 333b1c73fc8SJaroslav Kysela params_change_substream(cable->streams[SNDRV_PCM_STREAM_PLAYBACK], 334b1c73fc8SJaroslav Kysela runtime); 335b1c73fc8SJaroslav Kysela params_change_substream(cable->streams[SNDRV_PCM_STREAM_CAPTURE], 336b1c73fc8SJaroslav Kysela runtime); 337b1c73fc8SJaroslav Kysela } 338b1c73fc8SJaroslav Kysela 339597603d6SJaroslav Kysela static int loopback_prepare(struct snd_pcm_substream *substream) 340597603d6SJaroslav Kysela { 341597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 342597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 343597603d6SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 344b1c73fc8SJaroslav Kysela int bps, salign; 345597603d6SJaroslav Kysela 346597603d6SJaroslav Kysela salign = (snd_pcm_format_width(runtime->format) * 347597603d6SJaroslav Kysela runtime->channels) / 8; 348597603d6SJaroslav Kysela bps = salign * runtime->rate; 349597603d6SJaroslav Kysela if (bps <= 0 || salign <= 0) 350597603d6SJaroslav Kysela return -EINVAL; 351597603d6SJaroslav Kysela 352597603d6SJaroslav Kysela dpcm->buf_pos = 0; 353597603d6SJaroslav Kysela dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size); 354597603d6SJaroslav Kysela if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 355597603d6SJaroslav Kysela /* clear capture buffer */ 356597603d6SJaroslav Kysela dpcm->silent_size = dpcm->pcm_buffer_size; 357597603d6SJaroslav Kysela snd_pcm_format_set_silence(runtime->format, runtime->dma_area, 358597603d6SJaroslav Kysela runtime->buffer_size * runtime->channels); 359597603d6SJaroslav Kysela } 360597603d6SJaroslav Kysela 361597603d6SJaroslav Kysela dpcm->irq_pos = 0; 362597603d6SJaroslav Kysela dpcm->period_update_pending = 0; 363597603d6SJaroslav Kysela dpcm->pcm_bps = bps; 364597603d6SJaroslav Kysela dpcm->pcm_salign = salign; 365597603d6SJaroslav Kysela dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size); 366597603d6SJaroslav Kysela 367597603d6SJaroslav Kysela mutex_lock(&dpcm->loopback->cable_lock); 368b1c73fc8SJaroslav Kysela if (!(cable->valid & ~(1 << substream->stream)) || 369b1c73fc8SJaroslav Kysela (get_setup(dpcm)->notify && 370b1c73fc8SJaroslav Kysela substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) 371b1c73fc8SJaroslav Kysela params_change(substream); 372597603d6SJaroslav Kysela cable->valid |= 1 << substream->stream; 373597603d6SJaroslav Kysela mutex_unlock(&dpcm->loopback->cable_lock); 374597603d6SJaroslav Kysela 375597603d6SJaroslav Kysela return 0; 376597603d6SJaroslav Kysela } 377597603d6SJaroslav Kysela 378597603d6SJaroslav Kysela static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes) 379597603d6SJaroslav Kysela { 380597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = dpcm->substream->runtime; 381597603d6SJaroslav Kysela char *dst = runtime->dma_area; 382597603d6SJaroslav Kysela unsigned int dst_off = dpcm->buf_pos; 383597603d6SJaroslav Kysela 384597603d6SJaroslav Kysela if (dpcm->silent_size >= dpcm->pcm_buffer_size) 385597603d6SJaroslav Kysela return; 386597603d6SJaroslav Kysela if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size) 387597603d6SJaroslav Kysela bytes = dpcm->pcm_buffer_size - dpcm->silent_size; 388597603d6SJaroslav Kysela 389597603d6SJaroslav Kysela for (;;) { 390597603d6SJaroslav Kysela unsigned int size = bytes; 391597603d6SJaroslav Kysela if (dst_off + size > dpcm->pcm_buffer_size) 392597603d6SJaroslav Kysela size = dpcm->pcm_buffer_size - dst_off; 393597603d6SJaroslav Kysela snd_pcm_format_set_silence(runtime->format, dst + dst_off, 394597603d6SJaroslav Kysela bytes_to_frames(runtime, size) * 395597603d6SJaroslav Kysela runtime->channels); 396597603d6SJaroslav Kysela dpcm->silent_size += size; 397597603d6SJaroslav Kysela bytes -= size; 398597603d6SJaroslav Kysela if (!bytes) 399597603d6SJaroslav Kysela break; 400597603d6SJaroslav Kysela dst_off = 0; 401597603d6SJaroslav Kysela } 402597603d6SJaroslav Kysela } 403597603d6SJaroslav Kysela 404597603d6SJaroslav Kysela static void copy_play_buf(struct loopback_pcm *play, 405597603d6SJaroslav Kysela struct loopback_pcm *capt, 406597603d6SJaroslav Kysela unsigned int bytes) 407597603d6SJaroslav Kysela { 408597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = play->substream->runtime; 40920d9a26dSJaroslav Kysela char *src = runtime->dma_area; 410597603d6SJaroslav Kysela char *dst = capt->substream->runtime->dma_area; 411597603d6SJaroslav Kysela unsigned int src_off = play->buf_pos; 412597603d6SJaroslav Kysela unsigned int dst_off = capt->buf_pos; 413597603d6SJaroslav Kysela unsigned int clear_bytes = 0; 414597603d6SJaroslav Kysela 415597603d6SJaroslav Kysela /* check if playback is draining, trim the capture copy size 416597603d6SJaroslav Kysela * when our pointer is at the end of playback ring buffer */ 417597603d6SJaroslav Kysela if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && 418597603d6SJaroslav Kysela snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { 419597603d6SJaroslav Kysela snd_pcm_uframes_t appl_ptr, appl_ptr1, diff; 420597603d6SJaroslav Kysela appl_ptr = appl_ptr1 = runtime->control->appl_ptr; 421597603d6SJaroslav Kysela appl_ptr1 -= appl_ptr1 % runtime->buffer_size; 422597603d6SJaroslav Kysela appl_ptr1 += play->buf_pos / play->pcm_salign; 423597603d6SJaroslav Kysela if (appl_ptr < appl_ptr1) 424597603d6SJaroslav Kysela appl_ptr1 -= runtime->buffer_size; 425597603d6SJaroslav Kysela diff = (appl_ptr - appl_ptr1) * play->pcm_salign; 426597603d6SJaroslav Kysela if (diff < bytes) { 427597603d6SJaroslav Kysela clear_bytes = bytes - diff; 428597603d6SJaroslav Kysela bytes = diff; 429597603d6SJaroslav Kysela } 430597603d6SJaroslav Kysela } 431597603d6SJaroslav Kysela 432597603d6SJaroslav Kysela for (;;) { 433597603d6SJaroslav Kysela unsigned int size = bytes; 434597603d6SJaroslav Kysela if (src_off + size > play->pcm_buffer_size) 435597603d6SJaroslav Kysela size = play->pcm_buffer_size - src_off; 436597603d6SJaroslav Kysela if (dst_off + size > capt->pcm_buffer_size) 437597603d6SJaroslav Kysela size = capt->pcm_buffer_size - dst_off; 438597603d6SJaroslav Kysela memcpy(dst + dst_off, src + src_off, size); 439597603d6SJaroslav Kysela capt->silent_size = 0; 440597603d6SJaroslav Kysela bytes -= size; 441597603d6SJaroslav Kysela if (!bytes) 442597603d6SJaroslav Kysela break; 443597603d6SJaroslav Kysela src_off = (src_off + size) % play->pcm_buffer_size; 444597603d6SJaroslav Kysela dst_off = (dst_off + size) % capt->pcm_buffer_size; 445597603d6SJaroslav Kysela } 446597603d6SJaroslav Kysela 44720d9a26dSJaroslav Kysela if (clear_bytes > 0) { 448597603d6SJaroslav Kysela clear_capture_buf(capt, clear_bytes); 44920d9a26dSJaroslav Kysela capt->silent_size = 0; 45020d9a26dSJaroslav Kysela } 451597603d6SJaroslav Kysela } 452597603d6SJaroslav Kysela 453b012513cSJaroslav Kysela static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm, 454b012513cSJaroslav Kysela unsigned int jiffies_delta) 455597603d6SJaroslav Kysela { 456597603d6SJaroslav Kysela unsigned long last_pos; 457b012513cSJaroslav Kysela unsigned int delta; 458597603d6SJaroslav Kysela 459597603d6SJaroslav Kysela last_pos = byte_pos(dpcm, dpcm->irq_pos); 460b012513cSJaroslav Kysela dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps; 461b012513cSJaroslav Kysela delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos; 462b012513cSJaroslav Kysela if (delta >= dpcm->last_drift) 463b012513cSJaroslav Kysela delta -= dpcm->last_drift; 464b012513cSJaroslav Kysela dpcm->last_drift = 0; 465597603d6SJaroslav Kysela if (dpcm->irq_pos >= dpcm->period_size_frac) { 466597603d6SJaroslav Kysela dpcm->irq_pos %= dpcm->period_size_frac; 467597603d6SJaroslav Kysela dpcm->period_update_pending = 1; 468597603d6SJaroslav Kysela } 469b012513cSJaroslav Kysela return delta; 470b012513cSJaroslav Kysela } 471b012513cSJaroslav Kysela 472b012513cSJaroslav Kysela static inline void bytepos_finish(struct loopback_pcm *dpcm, 473b012513cSJaroslav Kysela unsigned int delta) 474b012513cSJaroslav Kysela { 475b012513cSJaroslav Kysela dpcm->buf_pos += delta; 476b012513cSJaroslav Kysela dpcm->buf_pos %= dpcm->pcm_buffer_size; 477597603d6SJaroslav Kysela } 478597603d6SJaroslav Kysela 479999fc9f6STakashi Iwai /* call in cable->lock */ 480dd04bb12SJaroslav Kysela static unsigned int loopback_pos_update(struct loopback_cable *cable) 481597603d6SJaroslav Kysela { 482597603d6SJaroslav Kysela struct loopback_pcm *dpcm_play = 483597603d6SJaroslav Kysela cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; 484597603d6SJaroslav Kysela struct loopback_pcm *dpcm_capt = 485597603d6SJaroslav Kysela cable->streams[SNDRV_PCM_STREAM_CAPTURE]; 486597603d6SJaroslav Kysela unsigned long delta_play = 0, delta_capt = 0; 487b012513cSJaroslav Kysela unsigned int running, count1, count2; 488597603d6SJaroslav Kysela 4895de9e45fSJaroslav Kysela running = cable->running ^ cable->pause; 490dd04bb12SJaroslav Kysela if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { 491597603d6SJaroslav Kysela delta_play = jiffies - dpcm_play->last_jiffies; 492597603d6SJaroslav Kysela dpcm_play->last_jiffies += delta_play; 493597603d6SJaroslav Kysela } 494597603d6SJaroslav Kysela 495dd04bb12SJaroslav Kysela if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { 496597603d6SJaroslav Kysela delta_capt = jiffies - dpcm_capt->last_jiffies; 497597603d6SJaroslav Kysela dpcm_capt->last_jiffies += delta_capt; 498597603d6SJaroslav Kysela } 499597603d6SJaroslav Kysela 50098d21df4STakashi Iwai if (delta_play == 0 && delta_capt == 0) 50198d21df4STakashi Iwai goto unlock; 502597603d6SJaroslav Kysela 503597603d6SJaroslav Kysela if (delta_play > delta_capt) { 504b012513cSJaroslav Kysela count1 = bytepos_delta(dpcm_play, delta_play - delta_capt); 505b012513cSJaroslav Kysela bytepos_finish(dpcm_play, count1); 506597603d6SJaroslav Kysela delta_play = delta_capt; 507597603d6SJaroslav Kysela } else if (delta_play < delta_capt) { 508b012513cSJaroslav Kysela count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play); 509b012513cSJaroslav Kysela clear_capture_buf(dpcm_capt, count1); 510b012513cSJaroslav Kysela bytepos_finish(dpcm_capt, count1); 511597603d6SJaroslav Kysela delta_capt = delta_play; 512597603d6SJaroslav Kysela } 513597603d6SJaroslav Kysela 51498d21df4STakashi Iwai if (delta_play == 0 && delta_capt == 0) 51598d21df4STakashi Iwai goto unlock; 51698d21df4STakashi Iwai 517597603d6SJaroslav Kysela /* note delta_capt == delta_play at this moment */ 518b012513cSJaroslav Kysela count1 = bytepos_delta(dpcm_play, delta_play); 519b012513cSJaroslav Kysela count2 = bytepos_delta(dpcm_capt, delta_capt); 520b012513cSJaroslav Kysela if (count1 < count2) { 521b012513cSJaroslav Kysela dpcm_capt->last_drift = count2 - count1; 522b012513cSJaroslav Kysela count1 = count2; 523b012513cSJaroslav Kysela } else if (count1 > count2) { 524b012513cSJaroslav Kysela dpcm_play->last_drift = count1 - count2; 525b012513cSJaroslav Kysela } 526b012513cSJaroslav Kysela copy_play_buf(dpcm_play, dpcm_capt, count1); 527b012513cSJaroslav Kysela bytepos_finish(dpcm_play, count1); 528b012513cSJaroslav Kysela bytepos_finish(dpcm_capt, count1); 52998d21df4STakashi Iwai unlock: 530dd04bb12SJaroslav Kysela return running; 531597603d6SJaroslav Kysela } 532597603d6SJaroslav Kysela 533597603d6SJaroslav Kysela static void loopback_timer_function(unsigned long data) 534597603d6SJaroslav Kysela { 535597603d6SJaroslav Kysela struct loopback_pcm *dpcm = (struct loopback_pcm *)data; 536999fc9f6STakashi Iwai unsigned long flags; 537597603d6SJaroslav Kysela 538999fc9f6STakashi Iwai spin_lock_irqsave(&dpcm->cable->lock, flags); 539999fc9f6STakashi Iwai if (loopback_pos_update(dpcm->cable) & (1 << dpcm->substream->stream)) { 540597603d6SJaroslav Kysela loopback_timer_start(dpcm); 541597603d6SJaroslav Kysela if (dpcm->period_update_pending) { 542597603d6SJaroslav Kysela dpcm->period_update_pending = 0; 543999fc9f6STakashi Iwai spin_unlock_irqrestore(&dpcm->cable->lock, flags); 544999fc9f6STakashi Iwai /* need to unlock before calling below */ 545597603d6SJaroslav Kysela snd_pcm_period_elapsed(dpcm->substream); 546999fc9f6STakashi Iwai return; 547597603d6SJaroslav Kysela } 548597603d6SJaroslav Kysela } 549999fc9f6STakashi Iwai spin_unlock_irqrestore(&dpcm->cable->lock, flags); 550dd04bb12SJaroslav Kysela } 551597603d6SJaroslav Kysela 552597603d6SJaroslav Kysela static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream) 553597603d6SJaroslav Kysela { 554597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 555597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 556999fc9f6STakashi Iwai snd_pcm_uframes_t pos; 557597603d6SJaroslav Kysela 558999fc9f6STakashi Iwai spin_lock(&dpcm->cable->lock); 559597603d6SJaroslav Kysela loopback_pos_update(dpcm->cable); 560999fc9f6STakashi Iwai pos = dpcm->buf_pos; 561999fc9f6STakashi Iwai spin_unlock(&dpcm->cable->lock); 562999fc9f6STakashi Iwai return bytes_to_frames(runtime, pos); 563597603d6SJaroslav Kysela } 564597603d6SJaroslav Kysela 565597603d6SJaroslav Kysela static struct snd_pcm_hardware loopback_pcm_hardware = 566597603d6SJaroslav Kysela { 567597603d6SJaroslav Kysela .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | 568edac8943STakashi Iwai SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | 569edac8943STakashi Iwai SNDRV_PCM_INFO_RESUME), 570597603d6SJaroslav Kysela .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | 571597603d6SJaroslav Kysela SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | 572597603d6SJaroslav Kysela SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE), 573597603d6SJaroslav Kysela .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, 574597603d6SJaroslav Kysela .rate_min = 8000, 575597603d6SJaroslav Kysela .rate_max = 192000, 576597603d6SJaroslav Kysela .channels_min = 1, 577597603d6SJaroslav Kysela .channels_max = 32, 578597603d6SJaroslav Kysela .buffer_bytes_max = 2 * 1024 * 1024, 579597603d6SJaroslav Kysela .period_bytes_min = 64, 5800db71023SJaroslav Kysela /* note check overflow in frac_pos() using pcm_rate_shift before 5810db71023SJaroslav Kysela changing period_bytes_max value */ 5820db71023SJaroslav Kysela .period_bytes_max = 1024 * 1024, 583597603d6SJaroslav Kysela .periods_min = 1, 584597603d6SJaroslav Kysela .periods_max = 1024, 585597603d6SJaroslav Kysela .fifo_size = 0, 586597603d6SJaroslav Kysela }; 587597603d6SJaroslav Kysela 588597603d6SJaroslav Kysela static void loopback_runtime_free(struct snd_pcm_runtime *runtime) 589597603d6SJaroslav Kysela { 590597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 591597603d6SJaroslav Kysela kfree(dpcm); 592597603d6SJaroslav Kysela } 593597603d6SJaroslav Kysela 594597603d6SJaroslav Kysela static int loopback_hw_params(struct snd_pcm_substream *substream, 595597603d6SJaroslav Kysela struct snd_pcm_hw_params *params) 596597603d6SJaroslav Kysela { 5976b69a0e5STakashi Iwai return snd_pcm_lib_alloc_vmalloc_buffer(substream, 5986b69a0e5STakashi Iwai params_buffer_bytes(params)); 599597603d6SJaroslav Kysela } 600597603d6SJaroslav Kysela 601597603d6SJaroslav Kysela static int loopback_hw_free(struct snd_pcm_substream *substream) 602597603d6SJaroslav Kysela { 603597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 604597603d6SJaroslav Kysela struct loopback_pcm *dpcm = runtime->private_data; 605597603d6SJaroslav Kysela struct loopback_cable *cable = dpcm->cable; 606597603d6SJaroslav Kysela 607597603d6SJaroslav Kysela mutex_lock(&dpcm->loopback->cable_lock); 608597603d6SJaroslav Kysela cable->valid &= ~(1 << substream->stream); 609597603d6SJaroslav Kysela mutex_unlock(&dpcm->loopback->cable_lock); 6106b69a0e5STakashi Iwai return snd_pcm_lib_free_vmalloc_buffer(substream); 611597603d6SJaroslav Kysela } 612597603d6SJaroslav Kysela 613597603d6SJaroslav Kysela static unsigned int get_cable_index(struct snd_pcm_substream *substream) 614597603d6SJaroslav Kysela { 615597603d6SJaroslav Kysela if (!substream->pcm->device) 616597603d6SJaroslav Kysela return substream->stream; 617597603d6SJaroslav Kysela else 618597603d6SJaroslav Kysela return !substream->stream; 619597603d6SJaroslav Kysela } 620597603d6SJaroslav Kysela 621b1c73fc8SJaroslav Kysela static int rule_format(struct snd_pcm_hw_params *params, 622b1c73fc8SJaroslav Kysela struct snd_pcm_hw_rule *rule) 623b1c73fc8SJaroslav Kysela { 624b1c73fc8SJaroslav Kysela 625b1c73fc8SJaroslav Kysela struct snd_pcm_hardware *hw = rule->private; 626b1c73fc8SJaroslav Kysela struct snd_mask *maskp = hw_param_mask(params, rule->var); 627b1c73fc8SJaroslav Kysela 628b1c73fc8SJaroslav Kysela maskp->bits[0] &= (u_int32_t)hw->formats; 629b1c73fc8SJaroslav Kysela maskp->bits[1] &= (u_int32_t)(hw->formats >> 32); 630b1c73fc8SJaroslav Kysela memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ 631b1c73fc8SJaroslav Kysela if (! maskp->bits[0] && ! maskp->bits[1]) 632b1c73fc8SJaroslav Kysela return -EINVAL; 633b1c73fc8SJaroslav Kysela return 0; 634b1c73fc8SJaroslav Kysela } 635b1c73fc8SJaroslav Kysela 636b1c73fc8SJaroslav Kysela static int rule_rate(struct snd_pcm_hw_params *params, 637b1c73fc8SJaroslav Kysela struct snd_pcm_hw_rule *rule) 638b1c73fc8SJaroslav Kysela { 639b1c73fc8SJaroslav Kysela struct snd_pcm_hardware *hw = rule->private; 640b1c73fc8SJaroslav Kysela struct snd_interval t; 641b1c73fc8SJaroslav Kysela 642b1c73fc8SJaroslav Kysela t.min = hw->rate_min; 643b1c73fc8SJaroslav Kysela t.max = hw->rate_max; 644b1c73fc8SJaroslav Kysela t.openmin = t.openmax = 0; 645b1c73fc8SJaroslav Kysela t.integer = 0; 646b1c73fc8SJaroslav Kysela return snd_interval_refine(hw_param_interval(params, rule->var), &t); 647b1c73fc8SJaroslav Kysela } 648b1c73fc8SJaroslav Kysela 649b1c73fc8SJaroslav Kysela static int rule_channels(struct snd_pcm_hw_params *params, 650b1c73fc8SJaroslav Kysela struct snd_pcm_hw_rule *rule) 651b1c73fc8SJaroslav Kysela { 652b1c73fc8SJaroslav Kysela struct snd_pcm_hardware *hw = rule->private; 653b1c73fc8SJaroslav Kysela struct snd_interval t; 654b1c73fc8SJaroslav Kysela 655b1c73fc8SJaroslav Kysela t.min = hw->channels_min; 656b1c73fc8SJaroslav Kysela t.max = hw->channels_max; 657b1c73fc8SJaroslav Kysela t.openmin = t.openmax = 0; 658b1c73fc8SJaroslav Kysela t.integer = 0; 659b1c73fc8SJaroslav Kysela return snd_interval_refine(hw_param_interval(params, rule->var), &t); 660b1c73fc8SJaroslav Kysela } 661b1c73fc8SJaroslav Kysela 662597603d6SJaroslav Kysela static int loopback_open(struct snd_pcm_substream *substream) 663597603d6SJaroslav Kysela { 664597603d6SJaroslav Kysela struct snd_pcm_runtime *runtime = substream->runtime; 665597603d6SJaroslav Kysela struct loopback *loopback = substream->private_data; 666597603d6SJaroslav Kysela struct loopback_pcm *dpcm; 667597603d6SJaroslav Kysela struct loopback_cable *cable; 668597603d6SJaroslav Kysela int err = 0; 669597603d6SJaroslav Kysela int dev = get_cable_index(substream); 670597603d6SJaroslav Kysela 671597603d6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 672597603d6SJaroslav Kysela dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); 673597603d6SJaroslav Kysela if (!dpcm) { 674597603d6SJaroslav Kysela err = -ENOMEM; 675597603d6SJaroslav Kysela goto unlock; 676597603d6SJaroslav Kysela } 677597603d6SJaroslav Kysela dpcm->loopback = loopback; 678597603d6SJaroslav Kysela dpcm->substream = substream; 679597603d6SJaroslav Kysela setup_timer(&dpcm->timer, loopback_timer_function, 680597603d6SJaroslav Kysela (unsigned long)dpcm); 681597603d6SJaroslav Kysela 682597603d6SJaroslav Kysela cable = loopback->cables[substream->number][dev]; 683597603d6SJaroslav Kysela if (!cable) { 684597603d6SJaroslav Kysela cable = kzalloc(sizeof(*cable), GFP_KERNEL); 685597603d6SJaroslav Kysela if (!cable) { 686597603d6SJaroslav Kysela kfree(dpcm); 687597603d6SJaroslav Kysela err = -ENOMEM; 688597603d6SJaroslav Kysela goto unlock; 689597603d6SJaroslav Kysela } 690597603d6SJaroslav Kysela spin_lock_init(&cable->lock); 691597603d6SJaroslav Kysela cable->hw = loopback_pcm_hardware; 692597603d6SJaroslav Kysela loopback->cables[substream->number][dev] = cable; 693597603d6SJaroslav Kysela } 694597603d6SJaroslav Kysela dpcm->cable = cable; 695597603d6SJaroslav Kysela cable->streams[substream->stream] = dpcm; 696597603d6SJaroslav Kysela 697597603d6SJaroslav Kysela snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); 698597603d6SJaroslav Kysela 699b1c73fc8SJaroslav Kysela /* use dynamic rules based on actual runtime->hw values */ 700b1c73fc8SJaroslav Kysela /* note that the default rules created in the PCM midlevel code */ 701b1c73fc8SJaroslav Kysela /* are cached -> they do not reflect the actual state */ 702b1c73fc8SJaroslav Kysela err = snd_pcm_hw_rule_add(runtime, 0, 703b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_FORMAT, 704b1c73fc8SJaroslav Kysela rule_format, &runtime->hw, 705b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_FORMAT, -1); 706b1c73fc8SJaroslav Kysela if (err < 0) 707b1c73fc8SJaroslav Kysela goto unlock; 708b1c73fc8SJaroslav Kysela err = snd_pcm_hw_rule_add(runtime, 0, 709b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_RATE, 710b1c73fc8SJaroslav Kysela rule_rate, &runtime->hw, 711b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_RATE, -1); 712b1c73fc8SJaroslav Kysela if (err < 0) 713b1c73fc8SJaroslav Kysela goto unlock; 714b1c73fc8SJaroslav Kysela err = snd_pcm_hw_rule_add(runtime, 0, 715b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_CHANNELS, 716b1c73fc8SJaroslav Kysela rule_channels, &runtime->hw, 717b1c73fc8SJaroslav Kysela SNDRV_PCM_HW_PARAM_CHANNELS, -1); 718b1c73fc8SJaroslav Kysela if (err < 0) 719b1c73fc8SJaroslav Kysela goto unlock; 720b1c73fc8SJaroslav Kysela 721597603d6SJaroslav Kysela runtime->private_data = dpcm; 722597603d6SJaroslav Kysela runtime->private_free = loopback_runtime_free; 723b1c73fc8SJaroslav Kysela if (get_notify(dpcm)) 724597603d6SJaroslav Kysela runtime->hw = loopback_pcm_hardware; 725b1c73fc8SJaroslav Kysela else 726597603d6SJaroslav Kysela runtime->hw = cable->hw; 727597603d6SJaroslav Kysela unlock: 728597603d6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 729597603d6SJaroslav Kysela return err; 730597603d6SJaroslav Kysela } 731597603d6SJaroslav Kysela 732597603d6SJaroslav Kysela static int loopback_close(struct snd_pcm_substream *substream) 733597603d6SJaroslav Kysela { 734597603d6SJaroslav Kysela struct loopback *loopback = substream->private_data; 735597603d6SJaroslav Kysela struct loopback_pcm *dpcm = substream->runtime->private_data; 736597603d6SJaroslav Kysela struct loopback_cable *cable; 737597603d6SJaroslav Kysela int dev = get_cable_index(substream); 738597603d6SJaroslav Kysela 739597603d6SJaroslav Kysela loopback_timer_stop(dpcm); 740597603d6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 741597603d6SJaroslav Kysela cable = loopback->cables[substream->number][dev]; 742597603d6SJaroslav Kysela if (cable->streams[!substream->stream]) { 743597603d6SJaroslav Kysela /* other stream is still alive */ 744597603d6SJaroslav Kysela cable->streams[substream->stream] = NULL; 745597603d6SJaroslav Kysela } else { 746597603d6SJaroslav Kysela /* free the cable */ 747597603d6SJaroslav Kysela loopback->cables[substream->number][dev] = NULL; 748597603d6SJaroslav Kysela kfree(cable); 749597603d6SJaroslav Kysela } 750597603d6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 751597603d6SJaroslav Kysela return 0; 752597603d6SJaroslav Kysela } 753597603d6SJaroslav Kysela 754597603d6SJaroslav Kysela static struct snd_pcm_ops loopback_playback_ops = { 755597603d6SJaroslav Kysela .open = loopback_open, 756597603d6SJaroslav Kysela .close = loopback_close, 757597603d6SJaroslav Kysela .ioctl = snd_pcm_lib_ioctl, 758597603d6SJaroslav Kysela .hw_params = loopback_hw_params, 759597603d6SJaroslav Kysela .hw_free = loopback_hw_free, 760597603d6SJaroslav Kysela .prepare = loopback_prepare, 761597603d6SJaroslav Kysela .trigger = loopback_trigger, 762597603d6SJaroslav Kysela .pointer = loopback_pointer, 7636b69a0e5STakashi Iwai .page = snd_pcm_lib_get_vmalloc_page, 7646b69a0e5STakashi Iwai .mmap = snd_pcm_lib_mmap_vmalloc, 765597603d6SJaroslav Kysela }; 766597603d6SJaroslav Kysela 767597603d6SJaroslav Kysela static struct snd_pcm_ops loopback_capture_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 780fbbb01a1SBill Pemberton static int loopback_pcm_new(struct loopback *loopback, 781597603d6SJaroslav Kysela int device, int substreams) 782597603d6SJaroslav Kysela { 783597603d6SJaroslav Kysela struct snd_pcm *pcm; 784597603d6SJaroslav Kysela int err; 785597603d6SJaroslav Kysela 786597603d6SJaroslav Kysela err = snd_pcm_new(loopback->card, "Loopback PCM", device, 787597603d6SJaroslav Kysela substreams, substreams, &pcm); 788597603d6SJaroslav Kysela if (err < 0) 789597603d6SJaroslav Kysela return err; 790597603d6SJaroslav Kysela snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_playback_ops); 791597603d6SJaroslav Kysela snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_capture_ops); 792597603d6SJaroslav Kysela 793597603d6SJaroslav Kysela pcm->private_data = loopback; 794597603d6SJaroslav Kysela pcm->info_flags = 0; 795597603d6SJaroslav Kysela strcpy(pcm->name, "Loopback PCM"); 796597603d6SJaroslav Kysela 797597603d6SJaroslav Kysela loopback->pcm[device] = pcm; 798597603d6SJaroslav Kysela return 0; 799597603d6SJaroslav Kysela } 800597603d6SJaroslav Kysela 801597603d6SJaroslav Kysela static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol, 802597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 803597603d6SJaroslav Kysela { 804597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 805597603d6SJaroslav Kysela uinfo->count = 1; 806597603d6SJaroslav Kysela uinfo->value.integer.min = 80000; 807597603d6SJaroslav Kysela uinfo->value.integer.max = 120000; 808597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 809597603d6SJaroslav Kysela return 0; 810597603d6SJaroslav Kysela } 811597603d6SJaroslav Kysela 812597603d6SJaroslav Kysela static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol, 813597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 814597603d6SJaroslav Kysela { 815597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 816597603d6SJaroslav Kysela 817597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 818597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 819597603d6SJaroslav Kysela [kcontrol->id.device].rate_shift; 820597603d6SJaroslav Kysela return 0; 821597603d6SJaroslav Kysela } 822597603d6SJaroslav Kysela 823597603d6SJaroslav Kysela static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol, 824597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 825597603d6SJaroslav Kysela { 826597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 827597603d6SJaroslav Kysela unsigned int val; 828597603d6SJaroslav Kysela int change = 0; 829597603d6SJaroslav Kysela 830597603d6SJaroslav Kysela val = ucontrol->value.integer.value[0]; 831597603d6SJaroslav Kysela if (val < 80000) 832597603d6SJaroslav Kysela val = 80000; 833597603d6SJaroslav Kysela if (val > 120000) 834597603d6SJaroslav Kysela val = 120000; 835597603d6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 836597603d6SJaroslav Kysela if (val != loopback->setup[kcontrol->id.subdevice] 837597603d6SJaroslav Kysela [kcontrol->id.device].rate_shift) { 838597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 839597603d6SJaroslav Kysela [kcontrol->id.device].rate_shift = val; 840597603d6SJaroslav Kysela change = 1; 841597603d6SJaroslav Kysela } 842597603d6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 843597603d6SJaroslav Kysela return change; 844597603d6SJaroslav Kysela } 845597603d6SJaroslav Kysela 846597603d6SJaroslav Kysela static int loopback_notify_get(struct snd_kcontrol *kcontrol, 847597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 848597603d6SJaroslav Kysela { 849597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 850597603d6SJaroslav Kysela 851597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 852597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 853597603d6SJaroslav Kysela [kcontrol->id.device].notify; 854597603d6SJaroslav Kysela return 0; 855597603d6SJaroslav Kysela } 856597603d6SJaroslav Kysela 857597603d6SJaroslav Kysela static int loopback_notify_put(struct snd_kcontrol *kcontrol, 858597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 859597603d6SJaroslav Kysela { 860597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 861597603d6SJaroslav Kysela unsigned int val; 862597603d6SJaroslav Kysela int change = 0; 863597603d6SJaroslav Kysela 864597603d6SJaroslav Kysela val = ucontrol->value.integer.value[0] ? 1 : 0; 865597603d6SJaroslav Kysela if (val != loopback->setup[kcontrol->id.subdevice] 866597603d6SJaroslav Kysela [kcontrol->id.device].notify) { 867597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 868597603d6SJaroslav Kysela [kcontrol->id.device].notify = val; 869597603d6SJaroslav Kysela change = 1; 870597603d6SJaroslav Kysela } 871597603d6SJaroslav Kysela return change; 872597603d6SJaroslav Kysela } 873597603d6SJaroslav Kysela 874597603d6SJaroslav Kysela static int loopback_active_get(struct snd_kcontrol *kcontrol, 875597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 876597603d6SJaroslav Kysela { 877597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 878597603d6SJaroslav Kysela struct loopback_cable *cable = loopback->cables 879ac446fb7SJaroslav Kysela [kcontrol->id.subdevice][kcontrol->id.device ^ 1]; 880597603d6SJaroslav Kysela unsigned int val = 0; 881597603d6SJaroslav Kysela 882597603d6SJaroslav Kysela if (cable != NULL) 883597603d6SJaroslav Kysela val = (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? 884597603d6SJaroslav Kysela 1 : 0; 885597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = val; 886597603d6SJaroslav Kysela return 0; 887597603d6SJaroslav Kysela } 888597603d6SJaroslav Kysela 889597603d6SJaroslav Kysela static int loopback_format_info(struct snd_kcontrol *kcontrol, 890597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 891597603d6SJaroslav Kysela { 892597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 893597603d6SJaroslav Kysela uinfo->count = 1; 894597603d6SJaroslav Kysela uinfo->value.integer.min = 0; 895597603d6SJaroslav Kysela uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST; 896597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 897597603d6SJaroslav Kysela return 0; 898597603d6SJaroslav Kysela } 899597603d6SJaroslav Kysela 900597603d6SJaroslav Kysela static int loopback_format_get(struct snd_kcontrol *kcontrol, 901597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 902597603d6SJaroslav Kysela { 903597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 904597603d6SJaroslav Kysela 905597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 906597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 907597603d6SJaroslav Kysela [kcontrol->id.device].format; 908597603d6SJaroslav Kysela return 0; 909597603d6SJaroslav Kysela } 910597603d6SJaroslav Kysela 911597603d6SJaroslav Kysela static int loopback_rate_info(struct snd_kcontrol *kcontrol, 912597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 913597603d6SJaroslav Kysela { 914597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 915597603d6SJaroslav Kysela uinfo->count = 1; 916597603d6SJaroslav Kysela uinfo->value.integer.min = 0; 917597603d6SJaroslav Kysela uinfo->value.integer.max = 192000; 918597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 919597603d6SJaroslav Kysela return 0; 920597603d6SJaroslav Kysela } 921597603d6SJaroslav Kysela 922597603d6SJaroslav Kysela static int loopback_rate_get(struct snd_kcontrol *kcontrol, 923597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 924597603d6SJaroslav Kysela { 925597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 926597603d6SJaroslav Kysela 927597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 928597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 929597603d6SJaroslav Kysela [kcontrol->id.device].rate; 930597603d6SJaroslav Kysela return 0; 931597603d6SJaroslav Kysela } 932597603d6SJaroslav Kysela 933597603d6SJaroslav Kysela static int loopback_channels_info(struct snd_kcontrol *kcontrol, 934597603d6SJaroslav Kysela struct snd_ctl_elem_info *uinfo) 935597603d6SJaroslav Kysela { 936597603d6SJaroslav Kysela uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 937597603d6SJaroslav Kysela uinfo->count = 1; 938597603d6SJaroslav Kysela uinfo->value.integer.min = 1; 939597603d6SJaroslav Kysela uinfo->value.integer.max = 1024; 940597603d6SJaroslav Kysela uinfo->value.integer.step = 1; 941597603d6SJaroslav Kysela return 0; 942597603d6SJaroslav Kysela } 943597603d6SJaroslav Kysela 944597603d6SJaroslav Kysela static int loopback_channels_get(struct snd_kcontrol *kcontrol, 945597603d6SJaroslav Kysela struct snd_ctl_elem_value *ucontrol) 946597603d6SJaroslav Kysela { 947597603d6SJaroslav Kysela struct loopback *loopback = snd_kcontrol_chip(kcontrol); 948597603d6SJaroslav Kysela 949597603d6SJaroslav Kysela ucontrol->value.integer.value[0] = 950597603d6SJaroslav Kysela loopback->setup[kcontrol->id.subdevice] 9511446c5fbSJaroslav Kysela [kcontrol->id.device].channels; 952597603d6SJaroslav Kysela return 0; 953597603d6SJaroslav Kysela } 954597603d6SJaroslav Kysela 955fbbb01a1SBill Pemberton static struct snd_kcontrol_new loopback_controls[] = { 956597603d6SJaroslav Kysela { 957597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 958597603d6SJaroslav Kysela .name = "PCM Rate Shift 100000", 959597603d6SJaroslav Kysela .info = loopback_rate_shift_info, 960597603d6SJaroslav Kysela .get = loopback_rate_shift_get, 961597603d6SJaroslav Kysela .put = loopback_rate_shift_put, 962597603d6SJaroslav Kysela }, 963597603d6SJaroslav Kysela { 964597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 965597603d6SJaroslav Kysela .name = "PCM Notify", 966597603d6SJaroslav Kysela .info = snd_ctl_boolean_mono_info, 967597603d6SJaroslav Kysela .get = loopback_notify_get, 968597603d6SJaroslav Kysela .put = loopback_notify_put, 969597603d6SJaroslav Kysela }, 970597603d6SJaroslav Kysela #define ACTIVE_IDX 2 971597603d6SJaroslav Kysela { 972597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 973597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 974597603d6SJaroslav Kysela .name = "PCM Slave Active", 975597603d6SJaroslav Kysela .info = snd_ctl_boolean_mono_info, 976597603d6SJaroslav Kysela .get = loopback_active_get, 977597603d6SJaroslav Kysela }, 978597603d6SJaroslav Kysela #define FORMAT_IDX 3 979597603d6SJaroslav Kysela { 980597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 981597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 982597603d6SJaroslav Kysela .name = "PCM Slave Format", 983597603d6SJaroslav Kysela .info = loopback_format_info, 984597603d6SJaroslav Kysela .get = loopback_format_get 985597603d6SJaroslav Kysela }, 986597603d6SJaroslav Kysela #define RATE_IDX 4 987597603d6SJaroslav Kysela { 988597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 989597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 990597603d6SJaroslav Kysela .name = "PCM Slave Rate", 991597603d6SJaroslav Kysela .info = loopback_rate_info, 992597603d6SJaroslav Kysela .get = loopback_rate_get 993597603d6SJaroslav Kysela }, 994597603d6SJaroslav Kysela #define CHANNELS_IDX 5 995597603d6SJaroslav Kysela { 996597603d6SJaroslav Kysela .access = SNDRV_CTL_ELEM_ACCESS_READ, 997597603d6SJaroslav Kysela .iface = SNDRV_CTL_ELEM_IFACE_PCM, 998597603d6SJaroslav Kysela .name = "PCM Slave Channels", 999597603d6SJaroslav Kysela .info = loopback_channels_info, 1000597603d6SJaroslav Kysela .get = loopback_channels_get 1001597603d6SJaroslav Kysela } 1002597603d6SJaroslav Kysela }; 1003597603d6SJaroslav Kysela 1004fbbb01a1SBill Pemberton static int loopback_mixer_new(struct loopback *loopback, int notify) 1005597603d6SJaroslav Kysela { 1006597603d6SJaroslav Kysela struct snd_card *card = loopback->card; 1007597603d6SJaroslav Kysela struct snd_pcm *pcm; 1008597603d6SJaroslav Kysela struct snd_kcontrol *kctl; 1009597603d6SJaroslav Kysela struct loopback_setup *setup; 1010597603d6SJaroslav Kysela int err, dev, substr, substr_count, idx; 1011597603d6SJaroslav Kysela 1012597603d6SJaroslav Kysela strcpy(card->mixername, "Loopback Mixer"); 1013597603d6SJaroslav Kysela for (dev = 0; dev < 2; dev++) { 1014597603d6SJaroslav Kysela pcm = loopback->pcm[dev]; 1015597603d6SJaroslav Kysela substr_count = 1016597603d6SJaroslav Kysela pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count; 1017597603d6SJaroslav Kysela for (substr = 0; substr < substr_count; substr++) { 1018597603d6SJaroslav Kysela setup = &loopback->setup[substr][dev]; 1019597603d6SJaroslav Kysela setup->notify = notify; 1020597603d6SJaroslav Kysela setup->rate_shift = NO_PITCH; 1021597603d6SJaroslav Kysela setup->format = SNDRV_PCM_FORMAT_S16_LE; 1022597603d6SJaroslav Kysela setup->rate = 48000; 1023597603d6SJaroslav Kysela setup->channels = 2; 1024597603d6SJaroslav Kysela for (idx = 0; idx < ARRAY_SIZE(loopback_controls); 1025597603d6SJaroslav Kysela idx++) { 1026597603d6SJaroslav Kysela kctl = snd_ctl_new1(&loopback_controls[idx], 1027597603d6SJaroslav Kysela loopback); 1028597603d6SJaroslav Kysela if (!kctl) 1029597603d6SJaroslav Kysela return -ENOMEM; 1030597603d6SJaroslav Kysela kctl->id.device = dev; 1031597603d6SJaroslav Kysela kctl->id.subdevice = substr; 1032597603d6SJaroslav Kysela switch (idx) { 1033597603d6SJaroslav Kysela case ACTIVE_IDX: 1034597603d6SJaroslav Kysela setup->active_id = kctl->id; 1035597603d6SJaroslav Kysela break; 1036597603d6SJaroslav Kysela case FORMAT_IDX: 1037597603d6SJaroslav Kysela setup->format_id = kctl->id; 1038597603d6SJaroslav Kysela break; 1039597603d6SJaroslav Kysela case RATE_IDX: 1040597603d6SJaroslav Kysela setup->rate_id = kctl->id; 1041597603d6SJaroslav Kysela break; 1042597603d6SJaroslav Kysela case CHANNELS_IDX: 1043597603d6SJaroslav Kysela setup->channels_id = kctl->id; 1044597603d6SJaroslav Kysela break; 1045597603d6SJaroslav Kysela default: 1046597603d6SJaroslav Kysela break; 1047597603d6SJaroslav Kysela } 1048597603d6SJaroslav Kysela err = snd_ctl_add(card, kctl); 1049597603d6SJaroslav Kysela if (err < 0) 1050597603d6SJaroslav Kysela return err; 1051597603d6SJaroslav Kysela } 1052597603d6SJaroslav Kysela } 1053597603d6SJaroslav Kysela } 1054597603d6SJaroslav Kysela return 0; 1055597603d6SJaroslav Kysela } 1056597603d6SJaroslav Kysela 1057e74670b6SJaroslav Kysela #ifdef CONFIG_PROC_FS 1058e74670b6SJaroslav Kysela 1059e74670b6SJaroslav Kysela static void print_dpcm_info(struct snd_info_buffer *buffer, 1060e74670b6SJaroslav Kysela struct loopback_pcm *dpcm, 1061e74670b6SJaroslav Kysela const char *id) 1062e74670b6SJaroslav Kysela { 1063e74670b6SJaroslav Kysela snd_iprintf(buffer, " %s\n", id); 1064e74670b6SJaroslav Kysela if (dpcm == NULL) { 1065e74670b6SJaroslav Kysela snd_iprintf(buffer, " inactive\n"); 1066e74670b6SJaroslav Kysela return; 1067e74670b6SJaroslav Kysela } 1068e74670b6SJaroslav Kysela snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size); 1069e74670b6SJaroslav Kysela snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos); 1070e74670b6SJaroslav Kysela snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size); 1071e74670b6SJaroslav Kysela snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size); 1072e74670b6SJaroslav Kysela snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps); 1073e74670b6SJaroslav Kysela snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign); 1074e74670b6SJaroslav Kysela snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift); 1075e74670b6SJaroslav Kysela snd_iprintf(buffer, " update_pending:\t%u\n", 1076e74670b6SJaroslav Kysela dpcm->period_update_pending); 1077e74670b6SJaroslav Kysela snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos); 1078e74670b6SJaroslav Kysela snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac); 1079e74670b6SJaroslav Kysela snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n", 1080e74670b6SJaroslav Kysela dpcm->last_jiffies, jiffies); 1081e74670b6SJaroslav Kysela snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires); 1082e74670b6SJaroslav Kysela } 1083e74670b6SJaroslav Kysela 1084e74670b6SJaroslav Kysela static void print_substream_info(struct snd_info_buffer *buffer, 1085e74670b6SJaroslav Kysela struct loopback *loopback, 1086e74670b6SJaroslav Kysela int sub, 1087e74670b6SJaroslav Kysela int num) 1088e74670b6SJaroslav Kysela { 1089e74670b6SJaroslav Kysela struct loopback_cable *cable = loopback->cables[sub][num]; 1090e74670b6SJaroslav Kysela 1091e74670b6SJaroslav Kysela snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub); 1092e74670b6SJaroslav Kysela if (cable == NULL) { 1093e74670b6SJaroslav Kysela snd_iprintf(buffer, " inactive\n"); 1094e74670b6SJaroslav Kysela return; 1095e74670b6SJaroslav Kysela } 1096e74670b6SJaroslav Kysela snd_iprintf(buffer, " valid: %u\n", cable->valid); 1097e74670b6SJaroslav Kysela snd_iprintf(buffer, " running: %u\n", cable->running); 10985de9e45fSJaroslav Kysela snd_iprintf(buffer, " pause: %u\n", cable->pause); 1099e74670b6SJaroslav Kysela print_dpcm_info(buffer, cable->streams[0], "Playback"); 1100e74670b6SJaroslav Kysela print_dpcm_info(buffer, cable->streams[1], "Capture"); 1101e74670b6SJaroslav Kysela } 1102e74670b6SJaroslav Kysela 1103e74670b6SJaroslav Kysela static void print_cable_info(struct snd_info_entry *entry, 1104e74670b6SJaroslav Kysela struct snd_info_buffer *buffer) 1105e74670b6SJaroslav Kysela { 1106e74670b6SJaroslav Kysela struct loopback *loopback = entry->private_data; 1107e74670b6SJaroslav Kysela int sub, num; 1108e74670b6SJaroslav Kysela 1109e74670b6SJaroslav Kysela mutex_lock(&loopback->cable_lock); 1110e74670b6SJaroslav Kysela num = entry->name[strlen(entry->name)-1]; 1111e74670b6SJaroslav Kysela num = num == '0' ? 0 : 1; 1112e74670b6SJaroslav Kysela for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++) 1113e74670b6SJaroslav Kysela print_substream_info(buffer, loopback, sub, num); 1114e74670b6SJaroslav Kysela mutex_unlock(&loopback->cable_lock); 1115e74670b6SJaroslav Kysela } 1116e74670b6SJaroslav Kysela 1117fbbb01a1SBill Pemberton static int loopback_proc_new(struct loopback *loopback, int cidx) 1118e74670b6SJaroslav Kysela { 1119e74670b6SJaroslav Kysela char name[32]; 1120e74670b6SJaroslav Kysela struct snd_info_entry *entry; 1121e74670b6SJaroslav Kysela int err; 1122e74670b6SJaroslav Kysela 1123e74670b6SJaroslav Kysela snprintf(name, sizeof(name), "cable#%d", cidx); 1124e74670b6SJaroslav Kysela err = snd_card_proc_new(loopback->card, name, &entry); 1125e74670b6SJaroslav Kysela if (err < 0) 1126e74670b6SJaroslav Kysela return err; 1127e74670b6SJaroslav Kysela 1128e74670b6SJaroslav Kysela snd_info_set_text_ops(entry, loopback, print_cable_info); 1129e74670b6SJaroslav Kysela return 0; 1130e74670b6SJaroslav Kysela } 1131e74670b6SJaroslav Kysela 1132e74670b6SJaroslav Kysela #else /* !CONFIG_PROC_FS */ 1133e74670b6SJaroslav Kysela 1134e74670b6SJaroslav Kysela #define loopback_proc_new(loopback, cidx) do { } while (0) 1135e74670b6SJaroslav Kysela 1136e74670b6SJaroslav Kysela #endif 1137e74670b6SJaroslav Kysela 1138fbbb01a1SBill Pemberton static int loopback_probe(struct platform_device *devptr) 1139597603d6SJaroslav Kysela { 1140597603d6SJaroslav Kysela struct snd_card *card; 1141597603d6SJaroslav Kysela struct loopback *loopback; 1142597603d6SJaroslav Kysela int dev = devptr->id; 1143597603d6SJaroslav Kysela int err; 1144597603d6SJaroslav Kysela 1145597603d6SJaroslav Kysela err = snd_card_create(index[dev], id[dev], THIS_MODULE, 1146597603d6SJaroslav Kysela sizeof(struct loopback), &card); 1147597603d6SJaroslav Kysela if (err < 0) 1148597603d6SJaroslav Kysela return err; 1149597603d6SJaroslav Kysela loopback = card->private_data; 1150597603d6SJaroslav Kysela 1151597603d6SJaroslav Kysela if (pcm_substreams[dev] < 1) 1152597603d6SJaroslav Kysela pcm_substreams[dev] = 1; 1153597603d6SJaroslav Kysela if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) 1154597603d6SJaroslav Kysela pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; 1155597603d6SJaroslav Kysela 1156597603d6SJaroslav Kysela loopback->card = card; 1157597603d6SJaroslav Kysela mutex_init(&loopback->cable_lock); 1158597603d6SJaroslav Kysela 1159597603d6SJaroslav Kysela err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]); 1160597603d6SJaroslav Kysela if (err < 0) 1161597603d6SJaroslav Kysela goto __nodev; 1162597603d6SJaroslav Kysela err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]); 1163597603d6SJaroslav Kysela if (err < 0) 1164597603d6SJaroslav Kysela goto __nodev; 1165597603d6SJaroslav Kysela err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0); 1166597603d6SJaroslav Kysela if (err < 0) 1167597603d6SJaroslav Kysela goto __nodev; 1168e74670b6SJaroslav Kysela loopback_proc_new(loopback, 0); 1169e74670b6SJaroslav Kysela loopback_proc_new(loopback, 1); 1170597603d6SJaroslav Kysela strcpy(card->driver, "Loopback"); 1171597603d6SJaroslav Kysela strcpy(card->shortname, "Loopback"); 1172597603d6SJaroslav Kysela sprintf(card->longname, "Loopback %i", dev + 1); 1173597603d6SJaroslav Kysela err = snd_card_register(card); 1174597603d6SJaroslav Kysela if (!err) { 1175597603d6SJaroslav Kysela platform_set_drvdata(devptr, card); 1176597603d6SJaroslav Kysela return 0; 1177597603d6SJaroslav Kysela } 1178597603d6SJaroslav Kysela __nodev: 1179597603d6SJaroslav Kysela snd_card_free(card); 1180597603d6SJaroslav Kysela return err; 1181597603d6SJaroslav Kysela } 1182597603d6SJaroslav Kysela 1183fbbb01a1SBill Pemberton static int loopback_remove(struct platform_device *devptr) 1184597603d6SJaroslav Kysela { 1185597603d6SJaroslav Kysela snd_card_free(platform_get_drvdata(devptr)); 1186597603d6SJaroslav Kysela platform_set_drvdata(devptr, NULL); 1187597603d6SJaroslav Kysela return 0; 1188597603d6SJaroslav Kysela } 1189597603d6SJaroslav Kysela 1190d34e4e00STakashi Iwai #ifdef CONFIG_PM_SLEEP 1191284e7ca7STakashi Iwai static int loopback_suspend(struct device *pdev) 1192597603d6SJaroslav Kysela { 1193284e7ca7STakashi Iwai struct snd_card *card = dev_get_drvdata(pdev); 1194597603d6SJaroslav Kysela struct loopback *loopback = card->private_data; 1195597603d6SJaroslav Kysela 1196597603d6SJaroslav Kysela snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); 1197597603d6SJaroslav Kysela 1198597603d6SJaroslav Kysela snd_pcm_suspend_all(loopback->pcm[0]); 1199597603d6SJaroslav Kysela snd_pcm_suspend_all(loopback->pcm[1]); 1200597603d6SJaroslav Kysela return 0; 1201597603d6SJaroslav Kysela } 1202597603d6SJaroslav Kysela 1203284e7ca7STakashi Iwai static int loopback_resume(struct device *pdev) 1204597603d6SJaroslav Kysela { 1205284e7ca7STakashi Iwai struct snd_card *card = dev_get_drvdata(pdev); 1206597603d6SJaroslav Kysela 1207597603d6SJaroslav Kysela snd_power_change_state(card, SNDRV_CTL_POWER_D0); 1208597603d6SJaroslav Kysela return 0; 1209597603d6SJaroslav Kysela } 1210284e7ca7STakashi Iwai 1211284e7ca7STakashi Iwai static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume); 1212284e7ca7STakashi Iwai #define LOOPBACK_PM_OPS &loopback_pm 1213284e7ca7STakashi Iwai #else 1214284e7ca7STakashi Iwai #define LOOPBACK_PM_OPS NULL 1215597603d6SJaroslav Kysela #endif 1216597603d6SJaroslav Kysela 1217597603d6SJaroslav Kysela #define SND_LOOPBACK_DRIVER "snd_aloop" 1218597603d6SJaroslav Kysela 1219597603d6SJaroslav Kysela static struct platform_driver loopback_driver = { 1220597603d6SJaroslav Kysela .probe = loopback_probe, 1221fbbb01a1SBill Pemberton .remove = loopback_remove, 1222597603d6SJaroslav Kysela .driver = { 12238bf01d8aSTakashi Iwai .name = SND_LOOPBACK_DRIVER, 12248bf01d8aSTakashi Iwai .owner = THIS_MODULE, 1225284e7ca7STakashi Iwai .pm = LOOPBACK_PM_OPS, 1226597603d6SJaroslav Kysela }, 1227597603d6SJaroslav Kysela }; 1228597603d6SJaroslav Kysela 1229597603d6SJaroslav Kysela static void loopback_unregister_all(void) 1230597603d6SJaroslav Kysela { 1231597603d6SJaroslav Kysela int i; 1232597603d6SJaroslav Kysela 1233597603d6SJaroslav Kysela for (i = 0; i < ARRAY_SIZE(devices); ++i) 1234597603d6SJaroslav Kysela platform_device_unregister(devices[i]); 1235597603d6SJaroslav Kysela platform_driver_unregister(&loopback_driver); 1236597603d6SJaroslav Kysela } 1237597603d6SJaroslav Kysela 1238597603d6SJaroslav Kysela static int __init alsa_card_loopback_init(void) 1239597603d6SJaroslav Kysela { 1240597603d6SJaroslav Kysela int i, err, cards; 1241597603d6SJaroslav Kysela 1242597603d6SJaroslav Kysela err = platform_driver_register(&loopback_driver); 1243597603d6SJaroslav Kysela if (err < 0) 1244597603d6SJaroslav Kysela return err; 1245597603d6SJaroslav Kysela 1246597603d6SJaroslav Kysela 1247597603d6SJaroslav Kysela cards = 0; 1248597603d6SJaroslav Kysela for (i = 0; i < SNDRV_CARDS; i++) { 1249597603d6SJaroslav Kysela struct platform_device *device; 1250597603d6SJaroslav Kysela if (!enable[i]) 1251597603d6SJaroslav Kysela continue; 1252597603d6SJaroslav Kysela device = platform_device_register_simple(SND_LOOPBACK_DRIVER, 1253597603d6SJaroslav Kysela i, NULL, 0); 1254597603d6SJaroslav Kysela if (IS_ERR(device)) 1255597603d6SJaroslav Kysela continue; 1256597603d6SJaroslav Kysela if (!platform_get_drvdata(device)) { 1257597603d6SJaroslav Kysela platform_device_unregister(device); 1258597603d6SJaroslav Kysela continue; 1259597603d6SJaroslav Kysela } 1260597603d6SJaroslav Kysela devices[i] = device; 1261597603d6SJaroslav Kysela cards++; 1262597603d6SJaroslav Kysela } 1263597603d6SJaroslav Kysela if (!cards) { 1264597603d6SJaroslav Kysela #ifdef MODULE 1265597603d6SJaroslav Kysela printk(KERN_ERR "aloop: No loopback enabled\n"); 1266597603d6SJaroslav Kysela #endif 1267597603d6SJaroslav Kysela loopback_unregister_all(); 1268597603d6SJaroslav Kysela return -ENODEV; 1269597603d6SJaroslav Kysela } 1270597603d6SJaroslav Kysela return 0; 1271597603d6SJaroslav Kysela } 1272597603d6SJaroslav Kysela 1273597603d6SJaroslav Kysela static void __exit alsa_card_loopback_exit(void) 1274597603d6SJaroslav Kysela { 1275597603d6SJaroslav Kysela loopback_unregister_all(); 1276597603d6SJaroslav Kysela } 1277597603d6SJaroslav Kysela 1278597603d6SJaroslav Kysela module_init(alsa_card_loopback_init) 1279597603d6SJaroslav Kysela module_exit(alsa_card_loopback_exit) 1280