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sound/drivers/aloop.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Loopback soundcard * * Original code: * Copyright (c) by Jaroslav Kysela <perex@perex.cz> * * More accurate positioning and full-duplex support: * Copyright (c) Ahmet İnan <ainan at mathematik.uni-freiburg.de> * * Major (almost complete) rewrite: * Copyright (c) by Takashi Iwai <tiwai@suse.de> * * A next major update in 2010 (separate timers for playback and capture): * Copyright (c) Jaroslav Kysela <perex@perex.cz> |
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*/ #include <linux/init.h> #include <linux/jiffies.h> #include <linux/slab.h> #include <linux/time.h> #include <linux/wait.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> #include <sound/core.h> #include <sound/control.h> #include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/info.h> |
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#include <sound/initval.h> MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); MODULE_DESCRIPTION("A loopback soundcard"); MODULE_LICENSE("GPL"); MODULE_SUPPORTED_DEVICE("{{ALSA,Loopback soundcard}}"); #define MAX_PCM_SUBSTREAMS 8 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ |
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static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; |
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static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; static int pcm_notify[SNDRV_CARDS]; module_param_array(index, int, NULL, 0444); MODULE_PARM_DESC(index, "Index value for loopback soundcard."); module_param_array(id, charp, NULL, 0444); MODULE_PARM_DESC(id, "ID string for loopback soundcard."); module_param_array(enable, bool, NULL, 0444); MODULE_PARM_DESC(enable, "Enable this loopback soundcard."); module_param_array(pcm_substreams, int, NULL, 0444); MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for loopback driver."); module_param_array(pcm_notify, int, NULL, 0444); MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels changes."); #define NO_PITCH 100000 struct loopback_pcm; struct loopback_cable { spinlock_t lock; struct loopback_pcm *streams[2]; struct snd_pcm_hardware hw; /* flags */ unsigned int valid; unsigned int running; |
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unsigned int pause; |
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}; struct loopback_setup { unsigned int notify: 1; unsigned int rate_shift; unsigned int format; unsigned int rate; unsigned int channels; struct snd_ctl_elem_id active_id; struct snd_ctl_elem_id format_id; struct snd_ctl_elem_id rate_id; struct snd_ctl_elem_id channels_id; }; struct loopback { struct snd_card *card; struct mutex cable_lock; struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2]; struct snd_pcm *pcm[2]; struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2]; }; struct loopback_pcm { struct loopback *loopback; struct snd_pcm_substream *substream; struct loopback_cable *cable; unsigned int pcm_buffer_size; unsigned int buf_pos; /* position in buffer */ unsigned int silent_size; /* PCM parameters */ unsigned int pcm_period_size; unsigned int pcm_bps; /* bytes per second */ unsigned int pcm_salign; /* bytes per sample * channels */ unsigned int pcm_rate_shift; /* rate shift value */ /* flags */ unsigned int period_update_pending :1; /* timer stuff */ unsigned int irq_pos; /* fractional IRQ position */ unsigned int period_size_frac; |
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unsigned int last_drift; |
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unsigned long last_jiffies; struct timer_list timer; }; static struct platform_device *devices[SNDRV_CARDS]; static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x) { if (dpcm->pcm_rate_shift == NO_PITCH) { x /= HZ; } else { x = div_u64(NO_PITCH * (unsigned long long)x, HZ * (unsigned long long)dpcm->pcm_rate_shift); } return x - (x % dpcm->pcm_salign); } static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x) { if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */ return x * HZ; } else { x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ, NO_PITCH); } return x; } static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm) { int device = dpcm->substream->pstr->pcm->device; if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) device ^= 1; return &dpcm->loopback->setup[dpcm->substream->number][device]; } static inline unsigned int get_notify(struct loopback_pcm *dpcm) { return get_setup(dpcm)->notify; } static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm) { return get_setup(dpcm)->rate_shift; } |
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/* call in cable->lock */ |
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static void loopback_timer_start(struct loopback_pcm *dpcm) { unsigned long tick; unsigned int rate_shift = get_rate_shift(dpcm); if (rate_shift != dpcm->pcm_rate_shift) { dpcm->pcm_rate_shift = rate_shift; dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size); } |
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if (dpcm->period_size_frac <= dpcm->irq_pos) { dpcm->irq_pos %= dpcm->period_size_frac; dpcm->period_update_pending = 1; } |
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tick = dpcm->period_size_frac - dpcm->irq_pos; tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps; |
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mod_timer(&dpcm->timer, jiffies + tick); |
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} |
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/* call in cable->lock */ |
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static inline void loopback_timer_stop(struct loopback_pcm *dpcm) { del_timer(&dpcm->timer); |
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dpcm->timer.expires = 0; |
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} |
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static inline void loopback_timer_stop_sync(struct loopback_pcm *dpcm) { del_timer_sync(&dpcm->timer); } |
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#define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK) #define CABLE_VALID_CAPTURE (1 << SNDRV_PCM_STREAM_CAPTURE) #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE) static int loopback_check_format(struct loopback_cable *cable, int stream) { |
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struct snd_pcm_runtime *runtime, *cruntime; |
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struct loopback_setup *setup; struct snd_card *card; int check; if (cable->valid != CABLE_VALID_BOTH) { if (stream == SNDRV_PCM_STREAM_PLAYBACK) goto __notify; return 0; } runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> substream->runtime; |
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cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> substream->runtime; check = runtime->format != cruntime->format || runtime->rate != cruntime->rate || runtime->channels != cruntime->channels; |
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if (!check) return 0; if (stream == SNDRV_PCM_STREAM_CAPTURE) { return -EIO; } else { snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> substream, SNDRV_PCM_STATE_DRAINING); __notify: runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> substream->runtime; setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]); card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card; if (setup->format != runtime->format) { snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &setup->format_id); setup->format = runtime->format; } if (setup->rate != runtime->rate) { snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &setup->rate_id); setup->rate = runtime->rate; } if (setup->channels != runtime->channels) { snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &setup->channels_id); setup->channels = runtime->channels; } } return 0; } static void loopback_active_notify(struct loopback_pcm *dpcm) { snd_ctl_notify(dpcm->loopback->card, SNDRV_CTL_EVENT_MASK_VALUE, &get_setup(dpcm)->active_id); } static int loopback_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_pcm_runtime *runtime = substream->runtime; struct loopback_pcm *dpcm = runtime->private_data; struct loopback_cable *cable = dpcm->cable; |
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int err, stream = 1 << substream->stream; |
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switch (cmd) { case SNDRV_PCM_TRIGGER_START: err = loopback_check_format(cable, substream->stream); if (err < 0) return err; dpcm->last_jiffies = jiffies; dpcm->pcm_rate_shift = 0; |
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dpcm->last_drift = 0; |
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spin_lock(&cable->lock); |
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cable->running |= stream; cable->pause &= ~stream; |
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loopback_timer_start(dpcm); |
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spin_unlock(&cable->lock); |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) loopback_active_notify(dpcm); break; case SNDRV_PCM_TRIGGER_STOP: |
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spin_lock(&cable->lock); |
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cable->running &= ~stream; cable->pause &= ~stream; |
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loopback_timer_stop(dpcm); |
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spin_unlock(&cable->lock); |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) loopback_active_notify(dpcm); break; |
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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spin_lock(&cable->lock); cable->pause |= stream; |
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loopback_timer_stop(dpcm); |
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spin_unlock(&cable->lock); |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) loopback_active_notify(dpcm); |
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break; case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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spin_lock(&cable->lock); dpcm->last_jiffies = jiffies; cable->pause &= ~stream; |
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loopback_timer_start(dpcm); |
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spin_unlock(&cable->lock); |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) loopback_active_notify(dpcm); |
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break; |
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default: return -EINVAL; } return 0; } |
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static void params_change(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct loopback_pcm *dpcm = runtime->private_data; struct loopback_cable *cable = dpcm->cable; |
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cable->hw.formats = pcm_format_to_bits(runtime->format); |
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cable->hw.rate_min = runtime->rate; cable->hw.rate_max = runtime->rate; cable->hw.channels_min = runtime->channels; cable->hw.channels_max = runtime->channels; |
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} |
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static int loopback_prepare(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct loopback_pcm *dpcm = runtime->private_data; struct loopback_cable *cable = dpcm->cable; |
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int bps, salign; |
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|
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loopback_timer_stop_sync(dpcm); |
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salign = (snd_pcm_format_physical_width(runtime->format) * |
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runtime->channels) / 8; bps = salign * runtime->rate; if (bps <= 0 || salign <= 0) return -EINVAL; dpcm->buf_pos = 0; dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size); if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { /* clear capture buffer */ dpcm->silent_size = dpcm->pcm_buffer_size; snd_pcm_format_set_silence(runtime->format, runtime->dma_area, runtime->buffer_size * runtime->channels); } dpcm->irq_pos = 0; dpcm->period_update_pending = 0; dpcm->pcm_bps = bps; dpcm->pcm_salign = salign; dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size); mutex_lock(&dpcm->loopback->cable_lock); |
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if (!(cable->valid & ~(1 << substream->stream)) || (get_setup(dpcm)->notify && substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) params_change(substream); |
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cable->valid |= 1 << substream->stream; mutex_unlock(&dpcm->loopback->cable_lock); return 0; } static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes) { struct snd_pcm_runtime *runtime = dpcm->substream->runtime; char *dst = runtime->dma_area; unsigned int dst_off = dpcm->buf_pos; if (dpcm->silent_size >= dpcm->pcm_buffer_size) return; if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size) bytes = dpcm->pcm_buffer_size - dpcm->silent_size; for (;;) { unsigned int size = bytes; if (dst_off + size > dpcm->pcm_buffer_size) size = dpcm->pcm_buffer_size - dst_off; snd_pcm_format_set_silence(runtime->format, dst + dst_off, bytes_to_frames(runtime, size) * runtime->channels); dpcm->silent_size += size; bytes -= size; if (!bytes) break; dst_off = 0; } } static void copy_play_buf(struct loopback_pcm *play, struct loopback_pcm *capt, unsigned int bytes) { struct snd_pcm_runtime *runtime = play->substream->runtime; |
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char *src = runtime->dma_area; |
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char *dst = capt->substream->runtime->dma_area; unsigned int src_off = play->buf_pos; unsigned int dst_off = capt->buf_pos; unsigned int clear_bytes = 0; /* check if playback is draining, trim the capture copy size * when our pointer is at the end of playback ring buffer */ if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { snd_pcm_uframes_t appl_ptr, appl_ptr1, diff; appl_ptr = appl_ptr1 = runtime->control->appl_ptr; appl_ptr1 -= appl_ptr1 % runtime->buffer_size; appl_ptr1 += play->buf_pos / play->pcm_salign; if (appl_ptr < appl_ptr1) appl_ptr1 -= runtime->buffer_size; diff = (appl_ptr - appl_ptr1) * play->pcm_salign; if (diff < bytes) { clear_bytes = bytes - diff; bytes = diff; } } for (;;) { unsigned int size = bytes; if (src_off + size > play->pcm_buffer_size) size = play->pcm_buffer_size - src_off; if (dst_off + size > capt->pcm_buffer_size) size = capt->pcm_buffer_size - dst_off; memcpy(dst + dst_off, src + src_off, size); capt->silent_size = 0; bytes -= size; if (!bytes) break; src_off = (src_off + size) % play->pcm_buffer_size; dst_off = (dst_off + size) % capt->pcm_buffer_size; } |
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if (clear_bytes > 0) { |
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clear_capture_buf(capt, clear_bytes); |
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capt->silent_size = 0; } |
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} |
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static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm, unsigned int jiffies_delta) |
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{ |
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unsigned long last_pos; |
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unsigned int delta; |
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last_pos = byte_pos(dpcm, dpcm->irq_pos); |
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dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps; delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos; if (delta >= dpcm->last_drift) delta -= dpcm->last_drift; dpcm->last_drift = 0; |
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if (dpcm->irq_pos >= dpcm->period_size_frac) { dpcm->irq_pos %= dpcm->period_size_frac; dpcm->period_update_pending = 1; } |
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return delta; } static inline void bytepos_finish(struct loopback_pcm *dpcm, unsigned int delta) { dpcm->buf_pos += delta; dpcm->buf_pos %= dpcm->pcm_buffer_size; |
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} |
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/* call in cable->lock */ |
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static unsigned int loopback_pos_update(struct loopback_cable *cable) |
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{ struct loopback_pcm *dpcm_play = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; struct loopback_pcm *dpcm_capt = cable->streams[SNDRV_PCM_STREAM_CAPTURE]; unsigned long delta_play = 0, delta_capt = 0; |
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unsigned int running, count1, count2; |
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|
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running = cable->running ^ cable->pause; |
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if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { |
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delta_play = jiffies - dpcm_play->last_jiffies; dpcm_play->last_jiffies += delta_play; } |
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if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { |
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delta_capt = jiffies - dpcm_capt->last_jiffies; dpcm_capt->last_jiffies += delta_capt; } |
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if (delta_play == 0 && delta_capt == 0) goto unlock; |
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if (delta_play > delta_capt) { |
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count1 = bytepos_delta(dpcm_play, delta_play - delta_capt); bytepos_finish(dpcm_play, count1); |
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delta_play = delta_capt; } else if (delta_play < delta_capt) { |
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count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play); clear_capture_buf(dpcm_capt, count1); bytepos_finish(dpcm_capt, count1); |
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delta_capt = delta_play; } |
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if (delta_play == 0 && delta_capt == 0) goto unlock; |
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/* note delta_capt == delta_play at this moment */ |
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count1 = bytepos_delta(dpcm_play, delta_play); count2 = bytepos_delta(dpcm_capt, delta_capt); if (count1 < count2) { dpcm_capt->last_drift = count2 - count1; count1 = count2; } else if (count1 > count2) { dpcm_play->last_drift = count1 - count2; } copy_play_buf(dpcm_play, dpcm_capt, count1); bytepos_finish(dpcm_play, count1); bytepos_finish(dpcm_capt, count1); |
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unlock: |
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return running; |
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} |
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static void loopback_timer_function(struct timer_list *t) |
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{ |
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struct loopback_pcm *dpcm = from_timer(dpcm, t, timer); |
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unsigned long flags; |
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|
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spin_lock_irqsave(&dpcm->cable->lock, flags); if (loopback_pos_update(dpcm->cable) & (1 << dpcm->substream->stream)) { |
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loopback_timer_start(dpcm); |
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if (dpcm->period_update_pending) { dpcm->period_update_pending = 0; |
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spin_unlock_irqrestore(&dpcm->cable->lock, flags); /* need to unlock before calling below */ |
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snd_pcm_period_elapsed(dpcm->substream); |
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return; |
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} |
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} |
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spin_unlock_irqrestore(&dpcm->cable->lock, flags); |
597603d61 ALSA: introduce t... |
514 515 516 517 518 519 |
} static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct loopback_pcm *dpcm = runtime->private_data; |
999fc9f6a ALSA: aloop - Clo... |
520 |
snd_pcm_uframes_t pos; |
597603d61 ALSA: introduce t... |
521 |
|
999fc9f6a ALSA: aloop - Clo... |
522 |
spin_lock(&dpcm->cable->lock); |
597603d61 ALSA: introduce t... |
523 |
loopback_pos_update(dpcm->cable); |
999fc9f6a ALSA: aloop - Clo... |
524 525 526 |
pos = dpcm->buf_pos; spin_unlock(&dpcm->cable->lock); return bytes_to_frames(runtime, pos); |
597603d61 ALSA: introduce t... |
527 |
} |
b6c0b7156 ALSA: drivers: ma... |
528 |
static const struct snd_pcm_hardware loopback_pcm_hardware = |
597603d61 ALSA: introduce t... |
529 530 |
{ .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | |
edac89438 ALSA: aloop: Fix ... |
531 532 |
SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME), |
597603d61 ALSA: introduce t... |
533 |
.formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | |
50e090841 ALSA: aloop: Supp... |
534 535 |
SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | |
597603d61 ALSA: introduce t... |
536 537 538 539 540 541 542 543 544 |
SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE), .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, .rate_min = 8000, .rate_max = 192000, .channels_min = 1, .channels_max = 32, .buffer_bytes_max = 2 * 1024 * 1024, .period_bytes_min = 64, |
0db710230 ALSA: snd-aloop -... |
545 546 547 |
/* note check overflow in frac_pos() using pcm_rate_shift before changing period_bytes_max value */ .period_bytes_max = 1024 * 1024, |
597603d61 ALSA: introduce t... |
548 549 550 551 552 553 554 555 556 557 558 559 560 561 |
.periods_min = 1, .periods_max = 1024, .fifo_size = 0, }; static void loopback_runtime_free(struct snd_pcm_runtime *runtime) { struct loopback_pcm *dpcm = runtime->private_data; kfree(dpcm); } static int loopback_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { |
6b69a0e52 ALSA: aloop - Use... |
562 563 |
return snd_pcm_lib_alloc_vmalloc_buffer(substream, params_buffer_bytes(params)); |
597603d61 ALSA: introduce t... |
564 565 566 567 568 569 570 571 572 573 574 |
} static int loopback_hw_free(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct loopback_pcm *dpcm = runtime->private_data; struct loopback_cable *cable = dpcm->cable; mutex_lock(&dpcm->loopback->cable_lock); cable->valid &= ~(1 << substream->stream); mutex_unlock(&dpcm->loopback->cable_lock); |
6b69a0e52 ALSA: aloop - Use... |
575 |
return snd_pcm_lib_free_vmalloc_buffer(substream); |
597603d61 ALSA: introduce t... |
576 577 578 579 580 581 582 583 584 |
} static unsigned int get_cable_index(struct snd_pcm_substream *substream) { if (!substream->pcm->device) return substream->stream; else return !substream->stream; } |
b1c73fc8e ALSA: snd-aloop: ... |
585 586 587 |
static int rule_format(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { |
898dfe468 ALSA: aloop: Fix ... |
588 589 |
struct loopback_pcm *dpcm = rule->private; struct loopback_cable *cable = dpcm->cable; |
b088b53e2 ALSA: aloop: Fix ... |
590 |
struct snd_mask m; |
b1c73fc8e ALSA: snd-aloop: ... |
591 |
|
b088b53e2 ALSA: aloop: Fix ... |
592 |
snd_mask_none(&m); |
898dfe468 ALSA: aloop: Fix ... |
593 594 595 596 |
mutex_lock(&dpcm->loopback->cable_lock); m.bits[0] = (u_int32_t)cable->hw.formats; m.bits[1] = (u_int32_t)(cable->hw.formats >> 32); mutex_unlock(&dpcm->loopback->cable_lock); |
b088b53e2 ALSA: aloop: Fix ... |
597 |
return snd_mask_refine(hw_param_mask(params, rule->var), &m); |
b1c73fc8e ALSA: snd-aloop: ... |
598 599 600 601 602 |
} static int rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { |
898dfe468 ALSA: aloop: Fix ... |
603 604 |
struct loopback_pcm *dpcm = rule->private; struct loopback_cable *cable = dpcm->cable; |
b1c73fc8e ALSA: snd-aloop: ... |
605 |
struct snd_interval t; |
898dfe468 ALSA: aloop: Fix ... |
606 607 608 609 |
mutex_lock(&dpcm->loopback->cable_lock); t.min = cable->hw.rate_min; t.max = cable->hw.rate_max; mutex_unlock(&dpcm->loopback->cable_lock); |
b1c73fc8e ALSA: snd-aloop: ... |
610 611 612 613 614 615 616 617 |
t.openmin = t.openmax = 0; t.integer = 0; return snd_interval_refine(hw_param_interval(params, rule->var), &t); } static int rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { |
898dfe468 ALSA: aloop: Fix ... |
618 619 |
struct loopback_pcm *dpcm = rule->private; struct loopback_cable *cable = dpcm->cable; |
b1c73fc8e ALSA: snd-aloop: ... |
620 |
struct snd_interval t; |
898dfe468 ALSA: aloop: Fix ... |
621 622 623 624 |
mutex_lock(&dpcm->loopback->cable_lock); t.min = cable->hw.channels_min; t.max = cable->hw.channels_max; mutex_unlock(&dpcm->loopback->cable_lock); |
b1c73fc8e ALSA: snd-aloop: ... |
625 626 627 628 |
t.openmin = t.openmax = 0; t.integer = 0; return snd_interval_refine(hw_param_interval(params, rule->var), &t); } |
9685347aa ALSA: aloop: Rele... |
629 630 631 632 633 634 635 636 637 638 639 |
static void free_cable(struct snd_pcm_substream *substream) { struct loopback *loopback = substream->private_data; int dev = get_cable_index(substream); struct loopback_cable *cable; cable = loopback->cables[substream->number][dev]; if (!cable) return; if (cable->streams[!substream->stream]) { /* other stream is still alive */ |
8e6b1a72a ALSA: aloop: Fix ... |
640 |
spin_lock_irq(&cable->lock); |
9685347aa ALSA: aloop: Rele... |
641 |
cable->streams[substream->stream] = NULL; |
8e6b1a72a ALSA: aloop: Fix ... |
642 |
spin_unlock_irq(&cable->lock); |
9685347aa ALSA: aloop: Rele... |
643 644 645 646 647 648 |
} else { /* free the cable */ loopback->cables[substream->number][dev] = NULL; kfree(cable); } } |
597603d61 ALSA: introduce t... |
649 650 651 652 653 |
static int loopback_open(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct loopback *loopback = substream->private_data; struct loopback_pcm *dpcm; |
9685347aa ALSA: aloop: Rele... |
654 |
struct loopback_cable *cable = NULL; |
597603d61 ALSA: introduce t... |
655 656 657 658 659 660 661 662 663 664 665 |
int err = 0; int dev = get_cable_index(substream); mutex_lock(&loopback->cable_lock); dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); if (!dpcm) { err = -ENOMEM; goto unlock; } dpcm->loopback = loopback; dpcm->substream = substream; |
bc47ba90b ALSA: drivers: Co... |
666 |
timer_setup(&dpcm->timer, loopback_timer_function, 0); |
597603d61 ALSA: introduce t... |
667 668 669 670 671 |
cable = loopback->cables[substream->number][dev]; if (!cable) { cable = kzalloc(sizeof(*cable), GFP_KERNEL); if (!cable) { |
597603d61 ALSA: introduce t... |
672 673 674 675 676 677 678 679 |
err = -ENOMEM; goto unlock; } spin_lock_init(&cable->lock); cable->hw = loopback_pcm_hardware; loopback->cables[substream->number][dev] = cable; } dpcm->cable = cable; |
597603d61 ALSA: introduce t... |
680 681 |
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); |
b1c73fc8e ALSA: snd-aloop: ... |
682 683 684 685 686 |
/* use dynamic rules based on actual runtime->hw values */ /* note that the default rules created in the PCM midlevel code */ /* are cached -> they do not reflect the actual state */ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, |
898dfe468 ALSA: aloop: Fix ... |
687 |
rule_format, dpcm, |
b1c73fc8e ALSA: snd-aloop: ... |
688 689 690 691 692 |
SNDRV_PCM_HW_PARAM_FORMAT, -1); if (err < 0) goto unlock; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, |
898dfe468 ALSA: aloop: Fix ... |
693 |
rule_rate, dpcm, |
b1c73fc8e ALSA: snd-aloop: ... |
694 695 696 697 698 |
SNDRV_PCM_HW_PARAM_RATE, -1); if (err < 0) goto unlock; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, |
898dfe468 ALSA: aloop: Fix ... |
699 |
rule_channels, dpcm, |
b1c73fc8e ALSA: snd-aloop: ... |
700 701 702 |
SNDRV_PCM_HW_PARAM_CHANNELS, -1); if (err < 0) goto unlock; |
597603d61 ALSA: introduce t... |
703 704 |
runtime->private_data = dpcm; runtime->private_free = loopback_runtime_free; |
b1c73fc8e ALSA: snd-aloop: ... |
705 |
if (get_notify(dpcm)) |
597603d61 ALSA: introduce t... |
706 |
runtime->hw = loopback_pcm_hardware; |
b1c73fc8e ALSA: snd-aloop: ... |
707 |
else |
597603d61 ALSA: introduce t... |
708 |
runtime->hw = cable->hw; |
8e6b1a72a ALSA: aloop: Fix ... |
709 710 711 712 |
spin_lock_irq(&cable->lock); cable->streams[substream->stream] = dpcm; spin_unlock_irq(&cable->lock); |
597603d61 ALSA: introduce t... |
713 |
unlock: |
9685347aa ALSA: aloop: Rele... |
714 715 716 717 |
if (err < 0) { free_cable(substream); kfree(dpcm); } |
597603d61 ALSA: introduce t... |
718 719 720 721 722 723 724 725 |
mutex_unlock(&loopback->cable_lock); return err; } static int loopback_close(struct snd_pcm_substream *substream) { struct loopback *loopback = substream->private_data; struct loopback_pcm *dpcm = substream->runtime->private_data; |
597603d61 ALSA: introduce t... |
726 |
|
67a01afaf ALSA: aloop: Sync... |
727 |
loopback_timer_stop_sync(dpcm); |
597603d61 ALSA: introduce t... |
728 |
mutex_lock(&loopback->cable_lock); |
9685347aa ALSA: aloop: Rele... |
729 |
free_cable(substream); |
597603d61 ALSA: introduce t... |
730 731 732 |
mutex_unlock(&loopback->cable_lock); return 0; } |
9f88058e7 ALSA: aloop: Redu... |
733 |
static const struct snd_pcm_ops loopback_pcm_ops = { |
597603d61 ALSA: introduce t... |
734 735 736 737 738 739 740 741 |
.open = loopback_open, .close = loopback_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = loopback_hw_params, .hw_free = loopback_hw_free, .prepare = loopback_prepare, .trigger = loopback_trigger, .pointer = loopback_pointer, |
6b69a0e52 ALSA: aloop - Use... |
742 |
.page = snd_pcm_lib_get_vmalloc_page, |
597603d61 ALSA: introduce t... |
743 |
}; |
fbbb01a12 ALSA: drivers: re... |
744 745 |
static int loopback_pcm_new(struct loopback *loopback, int device, int substreams) |
597603d61 ALSA: introduce t... |
746 747 748 749 750 751 752 753 |
{ struct snd_pcm *pcm; int err; err = snd_pcm_new(loopback->card, "Loopback PCM", device, substreams, substreams, &pcm); if (err < 0) return err; |
9f88058e7 ALSA: aloop: Redu... |
754 755 |
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_pcm_ops); snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_pcm_ops); |
597603d61 ALSA: introduce t... |
756 757 758 759 760 761 |
pcm->private_data = loopback; pcm->info_flags = 0; strcpy(pcm->name, "Loopback PCM"); loopback->pcm[device] = pcm; |
597603d61 ALSA: introduce t... |
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 |
return 0; } static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 1; uinfo->value.integer.min = 80000; uinfo->value.integer.max = 120000; uinfo->value.integer.step = 1; return 0; } static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
76b3421b3 ALSA: aloop: Add ... |
781 |
mutex_lock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
782 783 784 |
ucontrol->value.integer.value[0] = loopback->setup[kcontrol->id.subdevice] [kcontrol->id.device].rate_shift; |
76b3421b3 ALSA: aloop: Add ... |
785 |
mutex_unlock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 |
return 0; } static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct loopback *loopback = snd_kcontrol_chip(kcontrol); unsigned int val; int change = 0; val = ucontrol->value.integer.value[0]; if (val < 80000) val = 80000; if (val > 120000) val = 120000; mutex_lock(&loopback->cable_lock); if (val != loopback->setup[kcontrol->id.subdevice] [kcontrol->id.device].rate_shift) { loopback->setup[kcontrol->id.subdevice] [kcontrol->id.device].rate_shift = val; change = 1; } mutex_unlock(&loopback->cable_lock); return change; } static int loopback_notify_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
76b3421b3 ALSA: aloop: Add ... |
817 |
mutex_lock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
818 819 820 |
ucontrol->value.integer.value[0] = loopback->setup[kcontrol->id.subdevice] [kcontrol->id.device].notify; |
76b3421b3 ALSA: aloop: Add ... |
821 |
mutex_unlock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
822 823 824 825 826 827 828 829 830 831 832 |
return 0; } static int loopback_notify_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct loopback *loopback = snd_kcontrol_chip(kcontrol); unsigned int val; int change = 0; val = ucontrol->value.integer.value[0] ? 1 : 0; |
76b3421b3 ALSA: aloop: Add ... |
833 |
mutex_lock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
834 835 836 837 838 839 |
if (val != loopback->setup[kcontrol->id.subdevice] [kcontrol->id.device].notify) { loopback->setup[kcontrol->id.subdevice] [kcontrol->id.device].notify = val; change = 1; } |
76b3421b3 ALSA: aloop: Add ... |
840 |
mutex_unlock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
841 842 843 844 845 846 847 |
return change; } static int loopback_active_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
76b3421b3 ALSA: aloop: Add ... |
848 |
struct loopback_cable *cable; |
597603d61 ALSA: introduce t... |
849 |
unsigned int val = 0; |
76b3421b3 ALSA: aloop: Add ... |
850 851 |
mutex_lock(&loopback->cable_lock); cable = loopback->cables[kcontrol->id.subdevice][kcontrol->id.device ^ 1]; |
306a4f3ca ALSA: aloop: Mark... |
852 853 854 855 856 |
if (cable != NULL) { unsigned int running = cable->running ^ cable->pause; val = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? 1 : 0; } |
76b3421b3 ALSA: aloop: Add ... |
857 |
mutex_unlock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 |
ucontrol->value.integer.value[0] = val; return 0; } static int loopback_format_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 1; uinfo->value.integer.min = 0; uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST; uinfo->value.integer.step = 1; return 0; } static int loopback_format_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct loopback *loopback = snd_kcontrol_chip(kcontrol); ucontrol->value.integer.value[0] = loopback->setup[kcontrol->id.subdevice] [kcontrol->id.device].format; return 0; } static int loopback_rate_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 1; uinfo->value.integer.min = 0; uinfo->value.integer.max = 192000; uinfo->value.integer.step = 1; return 0; } static int loopback_rate_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
76b3421b3 ALSA: aloop: Add ... |
900 |
mutex_lock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
901 902 903 |
ucontrol->value.integer.value[0] = loopback->setup[kcontrol->id.subdevice] [kcontrol->id.device].rate; |
76b3421b3 ALSA: aloop: Add ... |
904 |
mutex_unlock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 |
return 0; } static int loopback_channels_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 1; uinfo->value.integer.min = 1; uinfo->value.integer.max = 1024; uinfo->value.integer.step = 1; return 0; } static int loopback_channels_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct loopback *loopback = snd_kcontrol_chip(kcontrol); |
76b3421b3 ALSA: aloop: Add ... |
924 |
mutex_lock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
925 926 |
ucontrol->value.integer.value[0] = loopback->setup[kcontrol->id.subdevice] |
1446c5fba ALSA: snd-aloop -... |
927 |
[kcontrol->id.device].channels; |
76b3421b3 ALSA: aloop: Add ... |
928 |
mutex_unlock(&loopback->cable_lock); |
597603d61 ALSA: introduce t... |
929 930 |
return 0; } |
fbbb01a12 ALSA: drivers: re... |
931 |
static struct snd_kcontrol_new loopback_controls[] = { |
597603d61 ALSA: introduce t... |
932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 |
{ .iface = SNDRV_CTL_ELEM_IFACE_PCM, .name = "PCM Rate Shift 100000", .info = loopback_rate_shift_info, .get = loopback_rate_shift_get, .put = loopback_rate_shift_put, }, { .iface = SNDRV_CTL_ELEM_IFACE_PCM, .name = "PCM Notify", .info = snd_ctl_boolean_mono_info, .get = loopback_notify_get, .put = loopback_notify_put, }, #define ACTIVE_IDX 2 { .access = SNDRV_CTL_ELEM_ACCESS_READ, .iface = SNDRV_CTL_ELEM_IFACE_PCM, .name = "PCM Slave Active", .info = snd_ctl_boolean_mono_info, .get = loopback_active_get, }, #define FORMAT_IDX 3 { .access = SNDRV_CTL_ELEM_ACCESS_READ, .iface = SNDRV_CTL_ELEM_IFACE_PCM, .name = "PCM Slave Format", .info = loopback_format_info, .get = loopback_format_get }, #define RATE_IDX 4 { .access = SNDRV_CTL_ELEM_ACCESS_READ, .iface = SNDRV_CTL_ELEM_IFACE_PCM, .name = "PCM Slave Rate", .info = loopback_rate_info, .get = loopback_rate_get }, #define CHANNELS_IDX 5 { .access = SNDRV_CTL_ELEM_ACCESS_READ, .iface = SNDRV_CTL_ELEM_IFACE_PCM, .name = "PCM Slave Channels", .info = loopback_channels_info, .get = loopback_channels_get } }; |
fbbb01a12 ALSA: drivers: re... |
979 |
static int loopback_mixer_new(struct loopback *loopback, int notify) |
597603d61 ALSA: introduce t... |
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 |
{ struct snd_card *card = loopback->card; struct snd_pcm *pcm; struct snd_kcontrol *kctl; struct loopback_setup *setup; int err, dev, substr, substr_count, idx; strcpy(card->mixername, "Loopback Mixer"); for (dev = 0; dev < 2; dev++) { pcm = loopback->pcm[dev]; substr_count = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count; for (substr = 0; substr < substr_count; substr++) { setup = &loopback->setup[substr][dev]; setup->notify = notify; setup->rate_shift = NO_PITCH; setup->format = SNDRV_PCM_FORMAT_S16_LE; setup->rate = 48000; setup->channels = 2; for (idx = 0; idx < ARRAY_SIZE(loopback_controls); idx++) { kctl = snd_ctl_new1(&loopback_controls[idx], loopback); if (!kctl) return -ENOMEM; kctl->id.device = dev; kctl->id.subdevice = substr; switch (idx) { case ACTIVE_IDX: setup->active_id = kctl->id; break; case FORMAT_IDX: setup->format_id = kctl->id; break; case RATE_IDX: setup->rate_id = kctl->id; break; case CHANNELS_IDX: setup->channels_id = kctl->id; break; default: break; } err = snd_ctl_add(card, kctl); if (err < 0) return err; } } } return 0; } |
e74670b6f ALSA: snd-aloop: ... |
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 |
static void print_dpcm_info(struct snd_info_buffer *buffer, struct loopback_pcm *dpcm, const char *id) { snd_iprintf(buffer, " %s ", id); if (dpcm == NULL) { snd_iprintf(buffer, " inactive "); return; } snd_iprintf(buffer, " buffer_size:\t%u ", dpcm->pcm_buffer_size); snd_iprintf(buffer, " buffer_pos:\t\t%u ", dpcm->buf_pos); snd_iprintf(buffer, " silent_size:\t%u ", dpcm->silent_size); snd_iprintf(buffer, " period_size:\t%u ", dpcm->pcm_period_size); snd_iprintf(buffer, " bytes_per_sec:\t%u ", dpcm->pcm_bps); snd_iprintf(buffer, " sample_align:\t%u ", dpcm->pcm_salign); snd_iprintf(buffer, " rate_shift:\t\t%u ", dpcm->pcm_rate_shift); snd_iprintf(buffer, " update_pending:\t%u ", dpcm->period_update_pending); snd_iprintf(buffer, " irq_pos:\t\t%u ", dpcm->irq_pos); snd_iprintf(buffer, " period_frac:\t%u ", dpcm->period_size_frac); snd_iprintf(buffer, " last_jiffies:\t%lu (%lu) ", dpcm->last_jiffies, jiffies); snd_iprintf(buffer, " timer_expires:\t%lu ", dpcm->timer.expires); } static void print_substream_info(struct snd_info_buffer *buffer, struct loopback *loopback, int sub, int num) { struct loopback_cable *cable = loopback->cables[sub][num]; snd_iprintf(buffer, "Cable %i substream %i: ", num, sub); if (cable == NULL) { snd_iprintf(buffer, " inactive "); return; } snd_iprintf(buffer, " valid: %u ", cable->valid); snd_iprintf(buffer, " running: %u ", cable->running); |
5de9e45fc ALSA: snd-aloop -... |
1088 1089 |
snd_iprintf(buffer, " pause: %u ", cable->pause); |
e74670b6f ALSA: snd-aloop: ... |
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print_dpcm_info(buffer, cable->streams[0], "Playback"); print_dpcm_info(buffer, cable->streams[1], "Capture"); } static void print_cable_info(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { struct loopback *loopback = entry->private_data; int sub, num; mutex_lock(&loopback->cable_lock); num = entry->name[strlen(entry->name)-1]; num = num == '0' ? 0 : 1; for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++) print_substream_info(buffer, loopback, sub, num); mutex_unlock(&loopback->cable_lock); } |
fbbb01a12 ALSA: drivers: re... |
1107 |
static int loopback_proc_new(struct loopback *loopback, int cidx) |
e74670b6f ALSA: snd-aloop: ... |
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{ char name[32]; |
e74670b6f ALSA: snd-aloop: ... |
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snprintf(name, sizeof(name), "cable#%d", cidx); |
815d808c7 ALSA: drivers: Cl... |
1112 1113 |
return snd_card_ro_proc_new(loopback->card, name, loopback, print_cable_info); |
e74670b6f ALSA: snd-aloop: ... |
1114 |
} |
fbbb01a12 ALSA: drivers: re... |
1115 |
static int loopback_probe(struct platform_device *devptr) |
597603d61 ALSA: introduce t... |
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{ struct snd_card *card; struct loopback *loopback; int dev = devptr->id; int err; |
5872f3f62 ALSA: drivers: Co... |
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err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE, sizeof(struct loopback), &card); |
597603d61 ALSA: introduce t... |
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if (err < 0) return err; loopback = card->private_data; if (pcm_substreams[dev] < 1) pcm_substreams[dev] = 1; if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; loopback->card = card; mutex_init(&loopback->cable_lock); err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]); if (err < 0) goto __nodev; err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]); if (err < 0) goto __nodev; err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0); if (err < 0) goto __nodev; |
e74670b6f ALSA: snd-aloop: ... |
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loopback_proc_new(loopback, 0); loopback_proc_new(loopback, 1); |
597603d61 ALSA: introduce t... |
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strcpy(card->driver, "Loopback"); strcpy(card->shortname, "Loopback"); sprintf(card->longname, "Loopback %i", dev + 1); err = snd_card_register(card); if (!err) { platform_set_drvdata(devptr, card); return 0; } __nodev: snd_card_free(card); return err; } |
fbbb01a12 ALSA: drivers: re... |
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static int loopback_remove(struct platform_device *devptr) |
597603d61 ALSA: introduce t... |
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{ snd_card_free(platform_get_drvdata(devptr)); |
597603d61 ALSA: introduce t... |
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return 0; } |
d34e4e00a ALSA: platform: C... |
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#ifdef CONFIG_PM_SLEEP |
284e7ca75 ALSA: convert PM ... |
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static int loopback_suspend(struct device *pdev) |
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{ |
284e7ca75 ALSA: convert PM ... |
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struct snd_card *card = dev_get_drvdata(pdev); |
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snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); |
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return 0; } |
284e7ca75 ALSA: convert PM ... |
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static int loopback_resume(struct device *pdev) |
597603d61 ALSA: introduce t... |
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{ |
284e7ca75 ALSA: convert PM ... |
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struct snd_card *card = dev_get_drvdata(pdev); |
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snd_power_change_state(card, SNDRV_CTL_POWER_D0); return 0; } |
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static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume); #define LOOPBACK_PM_OPS &loopback_pm #else #define LOOPBACK_PM_OPS NULL |
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#endif #define SND_LOOPBACK_DRIVER "snd_aloop" static struct platform_driver loopback_driver = { .probe = loopback_probe, |
fbbb01a12 ALSA: drivers: re... |
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.remove = loopback_remove, |
597603d61 ALSA: introduce t... |
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.driver = { |
8bf01d8ab ALSA: Add missing... |
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.name = SND_LOOPBACK_DRIVER, |
284e7ca75 ALSA: convert PM ... |
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.pm = LOOPBACK_PM_OPS, |
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}, }; static void loopback_unregister_all(void) { int i; for (i = 0; i < ARRAY_SIZE(devices); ++i) platform_device_unregister(devices[i]); platform_driver_unregister(&loopback_driver); } static int __init alsa_card_loopback_init(void) { int i, err, cards; err = platform_driver_register(&loopback_driver); if (err < 0) return err; cards = 0; for (i = 0; i < SNDRV_CARDS; i++) { struct platform_device *device; if (!enable[i]) continue; device = platform_device_register_simple(SND_LOOPBACK_DRIVER, i, NULL, 0); if (IS_ERR(device)) continue; if (!platform_get_drvdata(device)) { platform_device_unregister(device); continue; } devices[i] = device; cards++; } if (!cards) { #ifdef MODULE printk(KERN_ERR "aloop: No loopback enabled "); #endif loopback_unregister_all(); return -ENODEV; } return 0; } static void __exit alsa_card_loopback_exit(void) { loopback_unregister_all(); } module_init(alsa_card_loopback_init) module_exit(alsa_card_loopback_exit) |