/* * Dummy soundcard * Copyright (c) by Jaroslav Kysela <perex@suse.cz> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include <sound/driver.h> #include <linux/version.h> #include <linux/init.h> #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) #include <linux/jiffies.h> #else #include <linux/sched.h> #endif #include <linux/slab.h> #include <linux/time.h> #include <linux/wait.h> #include <sound/core.h> #include <sound/control.h> #include <sound/pcm.h> #include <sound/rawmidi.h> #define SNDRV_GET_ID #include <sound/initval.h> MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>"); MODULE_DESCRIPTION("Dummy soundcard (/dev/null)"); MODULE_LICENSE("GPL"); MODULE_CLASSES("{sound}"); MODULE_DEVICES("{{ALSA,Dummy soundcard}}"); #define MAX_PCM_DEVICES 4 #define MAX_PCM_SUBSTREAMS 16 #define MAX_MIDI_DEVICES 2 #if 0 /* RME9652 emulation */ #define MAX_BUFFER_SIZE (26 * 64 * 1024) #define USE_FORMATS SNDRV_PCM_FMTBIT_S32_LE #define USE_CHANNELS_MIN 26 #define USE_CHANNELS_MAX 26 #define USE_PERIODS_MIN 2 #define USE_PERIODS_MAX 2 #endif #if 0 /* ICE1712 emulation */ #define MAX_BUFFER_SIZE (256 * 1024) #define USE_FORMATS SNDRV_PCM_FMTBIT_S32_LE #define USE_CHANNELS_MIN 12 #define USE_CHANNELS_MAX 12 #define USE_PERIODS_MIN 1 #define USE_PERIODS_MAX 1024 #endif #if 0 /* UDA1341 emulation */ #define MAX_BUFFER_SIZE (16380) #define USE_FORMATS SNDRV_PCM_FMTBIT_S16_LE #define USE_CHANNELS_MIN 2 #define USE_CHANNELS_MAX 2 #define USE_PERIODS_MIN 2 #define USE_PERIODS_MAX 255 #endif /* defaults */ #ifndef MAX_BUFFER_SIZE #define MAX_BUFFER_SIZE (64*1024) #endif #ifndef USE_FORMATS #define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE) #endif #ifndef USE_CHANNELS_MIN #define USE_CHANNELS_MIN 1 #endif #ifndef USE_CHANNELS_MAX #define USE_CHANNELS_MAX 2 #endif #ifndef USE_PERIODS_MIN #define USE_PERIODS_MIN 1 #endif #ifndef USE_PERIODS_MAX #define USE_PERIODS_MAX 1024 #endif static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2}; MODULE_PARM(index, "1-" __MODULE_STRING(SNDRV_CARDS) "i"); MODULE_PARM_DESC(index, "Index value for dummy soundcard."); MODULE_PARM_SYNTAX(index, SNDRV_INDEX_DESC); MODULE_PARM(id, "1-" __MODULE_STRING(SNDRV_CARDS) "s"); MODULE_PARM_DESC(id, "ID string for dummy soundcard."); MODULE_PARM_SYNTAX(id, SNDRV_ID_DESC); MODULE_PARM(enable, "1-" __MODULE_STRING(SNDRV_CARDS) "i"); MODULE_PARM_DESC(enable, "Enable this dummy soundcard."); MODULE_PARM_SYNTAX(enable, SNDRV_ENABLE_DESC); MODULE_PARM(pcm_devs, "1-" __MODULE_STRING(SNDRV_CARDS) "i"); MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver."); MODULE_PARM_SYNTAX(pcm_devs, SNDRV_ENABLED ",allows:{{0,4}},default:1,dialog:list"); MODULE_PARM(pcm_substreams, "1-" __MODULE_STRING(SNDRV_CARDS) "i"); MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver."); MODULE_PARM_SYNTAX(pcm_substreams, SNDRV_ENABLED ",allows:{{1,16}},default:8,dialog:list"); //MODULE_PARM(midi_devs, "1-" __MODULE_STRING(SNDRV_CARDS) "i"); //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver."); //MODULE_PARM_SYNTAX(midi_devs, SNDRV_ENABLED ",allows:{{0,2}},default:8,dialog:list"); #define MIXER_ADDR_MASTER 0 #define MIXER_ADDR_LINE 1 #define MIXER_ADDR_MIC 2 #define MIXER_ADDR_SYNTH 3 #define MIXER_ADDR_CD 4 #define MIXER_ADDR_LAST 4 typedef struct snd_card_dummy { snd_card_t *card; spinlock_t mixer_lock; int mixer_volume[MIXER_ADDR_LAST+1][2]; int capture_source[MIXER_ADDR_LAST+1][2]; } snd_card_dummy_t; typedef struct snd_card_dummy_pcm { snd_card_dummy_t *dummy; spinlock_t lock; struct timer_list timer; unsigned int pcm_size; unsigned int pcm_count; unsigned int pcm_bps; /* bytes per second */ unsigned int pcm_jiffie; /* bytes per one jiffie */ unsigned int pcm_irq_pos; /* IRQ position */ unsigned int pcm_buf_pos; /* position in buffer */ snd_pcm_substream_t *substream; } snd_card_dummy_pcm_t; static snd_card_t *snd_dummy_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR; static int snd_card_dummy_playback_ioctl(snd_pcm_substream_t * substream, unsigned int cmd, void *arg) { return snd_pcm_lib_ioctl(substream, cmd, arg); } static int snd_card_dummy_capture_ioctl(snd_pcm_substream_t * substream, unsigned int cmd, void *arg) { return snd_pcm_lib_ioctl(substream, cmd, arg); } static void snd_card_dummy_pcm_timer_start(snd_pcm_substream_t * substream) { snd_pcm_runtime_t *runtime = substream->runtime; snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return); dpcm->timer.expires = 1 + jiffies; add_timer(&dpcm->timer); } static void snd_card_dummy_pcm_timer_stop(snd_pcm_substream_t * substream) { snd_pcm_runtime_t *runtime = substream->runtime; snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return); del_timer(&dpcm->timer); } static int snd_card_dummy_playback_trigger(snd_pcm_substream_t * substream, int cmd) { if (cmd == SNDRV_PCM_TRIGGER_START) { snd_card_dummy_pcm_timer_start(substream); } else if (cmd == SNDRV_PCM_TRIGGER_STOP) { snd_card_dummy_pcm_timer_stop(substream); } else { return -EINVAL; } return 0; } static int snd_card_dummy_capture_trigger(snd_pcm_substream_t * substream, int cmd) { if (cmd == SNDRV_PCM_TRIGGER_START) { snd_card_dummy_pcm_timer_start(substream); } else if (cmd == SNDRV_PCM_TRIGGER_STOP) { snd_card_dummy_pcm_timer_stop(substream); } else { return -EINVAL; } return 0; } static int snd_card_dummy_pcm_prepare(snd_pcm_substream_t * substream) { snd_pcm_runtime_t *runtime = substream->runtime; snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO); unsigned int bps; bps = runtime->rate * runtime->channels; bps *= snd_pcm_format_width(runtime->format); bps /= 8; if (bps <= 0) return -EINVAL; dpcm->pcm_bps = bps; dpcm->pcm_jiffie = bps / HZ; dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream); dpcm->pcm_count = snd_pcm_lib_period_bytes(substream); dpcm->pcm_irq_pos = 0; dpcm->pcm_buf_pos = 0; return 0; } static int snd_card_dummy_playback_prepare(snd_pcm_substream_t * substream) { return snd_card_dummy_pcm_prepare(substream); } static int snd_card_dummy_capture_prepare(snd_pcm_substream_t * substream) { return snd_card_dummy_pcm_prepare(substream); } static void snd_card_dummy_pcm_timer_function(unsigned long data) { snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, (void *)data, return); dpcm->timer.expires = 1 + jiffies; add_timer(&dpcm->timer); spin_lock_irq(&dpcm->lock); dpcm->pcm_irq_pos += dpcm->pcm_jiffie; dpcm->pcm_buf_pos += dpcm->pcm_jiffie; dpcm->pcm_buf_pos %= dpcm->pcm_size; if (dpcm->pcm_irq_pos >= dpcm->pcm_count) { dpcm->pcm_irq_pos %= dpcm->pcm_count; snd_pcm_period_elapsed(dpcm->substream); } spin_unlock_irq(&dpcm->lock); } static snd_pcm_uframes_t snd_card_dummy_playback_pointer(snd_pcm_substream_t * substream) { snd_pcm_runtime_t *runtime = substream->runtime; snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO); return bytes_to_frames(runtime, dpcm->pcm_buf_pos); } static snd_pcm_uframes_t snd_card_dummy_capture_pointer(snd_pcm_substream_t * substream) { snd_pcm_runtime_t *runtime = substream->runtime; snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return -ENXIO); return bytes_to_frames(runtime, dpcm->pcm_buf_pos); } static snd_pcm_hardware_t snd_card_dummy_playback = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP_VALID), .formats = USE_FORMATS, .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000, .rate_min = 5500, .rate_max = 48000, .channels_min = USE_CHANNELS_MIN, .channels_max = USE_CHANNELS_MAX, .buffer_bytes_max = MAX_BUFFER_SIZE, .period_bytes_min = 64, .period_bytes_max = MAX_BUFFER_SIZE, .periods_min = USE_PERIODS_MIN, .periods_max = USE_PERIODS_MAX, .fifo_size = 0, }; static snd_pcm_hardware_t snd_card_dummy_capture = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP_VALID), .formats = USE_FORMATS, .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000, .rate_min = 5500, .rate_max = 48000, .channels_min = USE_CHANNELS_MIN, .channels_max = USE_CHANNELS_MAX, .buffer_bytes_max = MAX_BUFFER_SIZE, .period_bytes_min = 64, .period_bytes_max = MAX_BUFFER_SIZE, .periods_min = USE_PERIODS_MIN, .periods_max = USE_PERIODS_MAX, .fifo_size = 0, }; static void snd_card_dummy_runtime_free(snd_pcm_runtime_t *runtime) { snd_card_dummy_pcm_t *dpcm = snd_magic_cast(snd_card_dummy_pcm_t, runtime->private_data, return); snd_magic_kfree(dpcm); } static int snd_card_dummy_playback_open(snd_pcm_substream_t * substream) { snd_pcm_runtime_t *runtime = substream->runtime; snd_card_dummy_pcm_t *dpcm; dpcm = snd_magic_kcalloc(snd_card_dummy_pcm_t, 0, GFP_KERNEL); if (dpcm == NULL) return -ENOMEM; if ((runtime->dma_area = snd_malloc_pages_fallback(MAX_BUFFER_SIZE, GFP_KERNEL, &runtime->dma_bytes)) == NULL) { snd_magic_kfree(dpcm); return -ENOMEM; } init_timer(&dpcm->timer); dpcm->timer.data = (unsigned long) dpcm; dpcm->timer.function = snd_card_dummy_pcm_timer_function; spin_lock_init(&dpcm->lock); dpcm->substream = substream; runtime->private_data = dpcm; runtime->private_free = snd_card_dummy_runtime_free; runtime->hw = snd_card_dummy_playback; if (substream->pcm->device & 1) { runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED; runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED; } if (substream->pcm->device & 2) runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID); return 0; } static int snd_card_dummy_capture_open(snd_pcm_substream_t * substream) { snd_pcm_runtime_t *runtime = substream->runtime; snd_card_dummy_pcm_t *dpcm; dpcm = snd_magic_kcalloc(snd_card_dummy_pcm_t, 0, GFP_KERNEL); if (dpcm == NULL) return -ENOMEM; if ((runtime->dma_area = snd_malloc_pages_fallback(MAX_BUFFER_SIZE, GFP_KERNEL, &runtime->dma_bytes)) == NULL) { snd_magic_kfree(dpcm); return -ENOMEM; } memset(runtime->dma_area, 0, runtime->dma_bytes); init_timer(&dpcm->timer); dpcm->timer.data = (unsigned long) dpcm; dpcm->timer.function = snd_card_dummy_pcm_timer_function; spin_lock_init(&dpcm->lock); dpcm->substream = substream; runtime->private_data = dpcm; runtime->private_free = snd_card_dummy_runtime_free; runtime->hw = snd_card_dummy_capture; if (substream->pcm->device == 1) { runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED; runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED; } if (substream->pcm->device & 2) runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID); return 0; } static int snd_card_dummy_playback_close(snd_pcm_substream_t * substream) { snd_pcm_runtime_t *runtime = substream->runtime; snd_free_pages(runtime->dma_area, runtime->dma_bytes); return 0; } static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream) { snd_pcm_runtime_t *runtime = substream->runtime; snd_free_pages(runtime->dma_area, runtime->dma_bytes); return 0; } static snd_pcm_ops_t snd_card_dummy_playback_ops = { .open = snd_card_dummy_playback_open, .close = snd_card_dummy_playback_close, .ioctl = snd_card_dummy_playback_ioctl, .prepare = snd_card_dummy_playback_prepare, .trigger = snd_card_dummy_playback_trigger, .pointer = snd_card_dummy_playback_pointer, }; static snd_pcm_ops_t snd_card_dummy_capture_ops = { .open = snd_card_dummy_capture_open, .close = snd_card_dummy_capture_close, .ioctl = snd_card_dummy_capture_ioctl, .prepare = snd_card_dummy_capture_prepare, .trigger = snd_card_dummy_capture_trigger, .pointer = snd_card_dummy_capture_pointer, }; static int __init snd_card_dummy_pcm(snd_card_dummy_t *dummy, int device, int substreams) { snd_pcm_t *pcm; int err; if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device, substreams, substreams, &pcm)) < 0) return err; snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops); snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops); pcm->private_data = dummy; pcm->info_flags = 0; strcpy(pcm->name, "Dummy PCM"); return 0; } #define DUMMY_VOLUME(xname, xindex, addr) \ { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \ .info = snd_dummy_volume_info, \ .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \ .private_value = addr } static int snd_dummy_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 2; uinfo->value.integer.min = 0; uinfo->value.integer.max = 100; return 0; } static int snd_dummy_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol) { snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol); unsigned long flags; int addr = kcontrol->private_value; spin_lock_irqsave(&dummy->mixer_lock, flags); ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0]; ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1]; spin_unlock_irqrestore(&dummy->mixer_lock, flags); return 0; } static int snd_dummy_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol) { snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol); unsigned long flags; int change, addr = kcontrol->private_value; int left, right; left = ucontrol->value.integer.value[0] % 101; right = ucontrol->value.integer.value[1] % 101; spin_lock_irqsave(&dummy->mixer_lock, flags); change = dummy->mixer_volume[addr][0] != left || dummy->mixer_volume[addr][1] != right; dummy->mixer_volume[addr][0] = left; dummy->mixer_volume[addr][1] = right; spin_unlock_irqrestore(&dummy->mixer_lock, flags); return change; } #define DUMMY_CAPSRC(xname, xindex, addr) \ { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \ .info = snd_dummy_capsrc_info, \ .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \ .private_value = addr } static int snd_dummy_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; uinfo->count = 2; uinfo->value.integer.min = 0; uinfo->value.integer.max = 1; return 0; } static int snd_dummy_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol) { snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol); unsigned long flags; int addr = kcontrol->private_value; spin_lock_irqsave(&dummy->mixer_lock, flags); ucontrol->value.integer.value[0] = dummy->capture_source[addr][0]; ucontrol->value.integer.value[1] = dummy->capture_source[addr][1]; spin_unlock_irqrestore(&dummy->mixer_lock, flags); return 0; } static int snd_dummy_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol) { snd_card_dummy_t *dummy = _snd_kcontrol_chip(kcontrol); unsigned long flags; int change, addr = kcontrol->private_value; int left, right; left = ucontrol->value.integer.value[0] & 1; right = ucontrol->value.integer.value[1] & 1; spin_lock_irqsave(&dummy->mixer_lock, flags); change = dummy->capture_source[addr][0] != left && dummy->capture_source[addr][1] != right; dummy->capture_source[addr][0] = left; dummy->capture_source[addr][1] = right; spin_unlock_irqrestore(&dummy->mixer_lock, flags); return change; } #define DUMMY_CONTROLS (sizeof(snd_dummy_controls)/sizeof(snd_kcontrol_new_t)) static snd_kcontrol_new_t snd_dummy_controls[] = { DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER), DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER), DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH), DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER), DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE), DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER), DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC), DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER), DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD), DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER) }; int __init snd_card_dummy_new_mixer(snd_card_dummy_t * dummy) { snd_card_t *card = dummy->card; unsigned int idx; int err; snd_assert(dummy != NULL, return -EINVAL); spin_lock_init(&dummy->mixer_lock); strcpy(card->mixername, "Dummy Mixer"); for (idx = 0; idx < DUMMY_CONTROLS; idx++) { if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0) return err; } return 0; } static int __init snd_card_dummy_probe(int dev) { snd_card_t *card; struct snd_card_dummy *dummy; int idx, err; if (!enable[dev]) return -ENODEV; card = snd_card_new(index[dev], id[dev], THIS_MODULE, sizeof(struct snd_card_dummy)); if (card == NULL) return -ENOMEM; dummy = (struct snd_card_dummy *)card->private_data; dummy->card = card; for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) { if (pcm_substreams[dev] < 1) pcm_substreams[dev] = 1; if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0) goto __nodev; } if ((err = snd_card_dummy_new_mixer(dummy)) < 0) goto __nodev; strcpy(card->driver, "Dummy"); strcpy(card->shortname, "Dummy"); sprintf(card->longname, "Dummy %i", dev + 1); if ((err = snd_card_register(card)) == 0) { snd_dummy_cards[dev] = card; return 0; } __nodev: snd_card_free(card); return err; } static int __init alsa_card_dummy_init(void) { int dev, cards; for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) { if (snd_card_dummy_probe(dev) < 0) { #ifdef MODULE printk(KERN_ERR "Dummy soundcard #%i not found or device busy\n", dev + 1); #endif break; } cards++; } if (!cards) { #ifdef MODULE printk(KERN_ERR "Dummy soundcard not found or device busy\n"); #endif return -ENODEV; } return 0; } static void __exit alsa_card_dummy_exit(void) { int idx; for (idx = 0; idx < SNDRV_CARDS; idx++) snd_card_free(snd_dummy_cards[idx]); } module_init(alsa_card_dummy_init) module_exit(alsa_card_dummy_exit) #ifndef MODULE /* format is: snd-dummy=enable,index,id, pcm_devs,pcm_substreams */ static int __init alsa_card_dummy_setup(char *str) { static unsigned __initdata nr_dev = 0; if (nr_dev >= SNDRV_CARDS) return 0; (void)(get_option(&str,&enable[nr_dev]) == 2 && get_option(&str,&index[nr_dev]) == 2 && get_id(&str,&id[nr_dev]) == 2 && get_option(&str,&pcm_devs[nr_dev]) == 2 && get_option(&str,&pcm_substreams[nr_dev]) == 2); nr_dev++; return 1; } __setup("snd-dummy=", alsa_card_dummy_setup); #endif /* ifndef MODULE */