diff options
Diffstat (limited to 'ANDROID_3.4.5/sound/drivers/aloop.c')
| -rw-r--r-- | ANDROID_3.4.5/sound/drivers/aloop.c | 1258 |
1 files changed, 0 insertions, 1258 deletions
diff --git a/ANDROID_3.4.5/sound/drivers/aloop.c b/ANDROID_3.4.5/sound/drivers/aloop.c deleted file mode 100644 index ad079b63..00000000 --- a/ANDROID_3.4.5/sound/drivers/aloop.c +++ /dev/null @@ -1,1258 +0,0 @@ -/* - * 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> - * - * 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 <linux/init.h> -#include <linux/jiffies.h> -#include <linux/slab.h> -#include <linux/time.h> -#include <linux/wait.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <sound/core.h> -#include <sound/control.h> -#include <sound/pcm.h> -#include <sound/info.h> -#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 */ -static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; -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; - unsigned int pause; -}; - -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; - 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; -} - -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); - } - if (dpcm->period_size_frac <= dpcm->irq_pos) { - dpcm->irq_pos %= dpcm->period_size_frac; - dpcm->period_update_pending = 1; - } - tick = dpcm->period_size_frac - dpcm->irq_pos; - tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps; - dpcm->timer.expires = jiffies + tick; - add_timer(&dpcm->timer); -} - -static inline void loopback_timer_stop(struct loopback_pcm *dpcm) -{ - del_timer(&dpcm->timer); - dpcm->timer.expires = 0; -} - -#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) -{ - struct snd_pcm_runtime *runtime, *cruntime; - 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; - cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> - substream->runtime; - check = runtime->format != cruntime->format || - runtime->rate != cruntime->rate || - runtime->channels != cruntime->channels; - 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; - int err, stream = 1 << substream->stream; - - 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; - spin_lock(&cable->lock); - cable->running |= stream; - cable->pause &= ~stream; - spin_unlock(&cable->lock); - loopback_timer_start(dpcm); - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) - loopback_active_notify(dpcm); - break; - case SNDRV_PCM_TRIGGER_STOP: - spin_lock(&cable->lock); - cable->running &= ~stream; - cable->pause &= ~stream; - spin_unlock(&cable->lock); - loopback_timer_stop(dpcm); - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) - loopback_active_notify(dpcm); - break; - case SNDRV_PCM_TRIGGER_PAUSE_PUSH: - spin_lock(&cable->lock); - cable->pause |= stream; - spin_unlock(&cable->lock); - loopback_timer_stop(dpcm); - break; - case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: - spin_lock(&cable->lock); - dpcm->last_jiffies = jiffies; - cable->pause &= ~stream; - spin_unlock(&cable->lock); - loopback_timer_start(dpcm); - break; - default: - return -EINVAL; - } - return 0; -} - -static void params_change_substream(struct loopback_pcm *dpcm, - struct snd_pcm_runtime *runtime) -{ - struct snd_pcm_runtime *dst_runtime; - - if (dpcm == NULL || dpcm->substream == NULL) - return; - dst_runtime = dpcm->substream->runtime; - if (dst_runtime == NULL) - return; - dst_runtime->hw = dpcm->cable->hw; -} - -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; - - cable->hw.formats = (1ULL << runtime->format); - cable->hw.rate_min = runtime->rate; - cable->hw.rate_max = runtime->rate; - cable->hw.channels_min = runtime->channels; - cable->hw.channels_max = runtime->channels; - params_change_substream(cable->streams[SNDRV_PCM_STREAM_PLAYBACK], - runtime); - params_change_substream(cable->streams[SNDRV_PCM_STREAM_CAPTURE], - runtime); -} - -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; - int bps, salign; - - salign = (snd_pcm_format_width(runtime->format) * - 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); - if (!(cable->valid & ~(1 << substream->stream)) || - (get_setup(dpcm)->notify && - substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) - params_change(substream); - 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; - char *src = runtime->dma_area; - 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; - } - - if (clear_bytes > 0) { - clear_capture_buf(capt, clear_bytes); - capt->silent_size = 0; - } -} - -#define BYTEPOS_UPDATE_POSONLY 0 -#define BYTEPOS_UPDATE_CLEAR 1 -#define BYTEPOS_UPDATE_COPY 2 - -static void loopback_bytepos_update(struct loopback_pcm *dpcm, - unsigned int delta, - unsigned int cmd) -{ - unsigned int count; - unsigned long last_pos; - - last_pos = byte_pos(dpcm, dpcm->irq_pos); - dpcm->irq_pos += delta * dpcm->pcm_bps; - count = byte_pos(dpcm, dpcm->irq_pos) - last_pos; - if (!count) - return; - if (cmd == BYTEPOS_UPDATE_CLEAR) - clear_capture_buf(dpcm, count); - else if (cmd == BYTEPOS_UPDATE_COPY) - copy_play_buf(dpcm->cable->streams[SNDRV_PCM_STREAM_PLAYBACK], - dpcm->cable->streams[SNDRV_PCM_STREAM_CAPTURE], - count); - dpcm->buf_pos += count; - dpcm->buf_pos %= dpcm->pcm_buffer_size; - if (dpcm->irq_pos >= dpcm->period_size_frac) { - dpcm->irq_pos %= dpcm->period_size_frac; - dpcm->period_update_pending = 1; - } -} - -static unsigned int loopback_pos_update(struct loopback_cable *cable) -{ - 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; - unsigned int running; - unsigned long flags; - - spin_lock_irqsave(&cable->lock, flags); - running = cable->running ^ cable->pause; - if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { - delta_play = jiffies - dpcm_play->last_jiffies; - dpcm_play->last_jiffies += delta_play; - } - - if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { - delta_capt = jiffies - dpcm_capt->last_jiffies; - dpcm_capt->last_jiffies += delta_capt; - } - - if (delta_play == 0 && delta_capt == 0) - goto unlock; - - if (delta_play > delta_capt) { - loopback_bytepos_update(dpcm_play, delta_play - delta_capt, - BYTEPOS_UPDATE_POSONLY); - delta_play = delta_capt; - } else if (delta_play < delta_capt) { - loopback_bytepos_update(dpcm_capt, delta_capt - delta_play, - BYTEPOS_UPDATE_CLEAR); - delta_capt = delta_play; - } - - if (delta_play == 0 && delta_capt == 0) - goto unlock; - - /* note delta_capt == delta_play at this moment */ - loopback_bytepos_update(dpcm_capt, delta_capt, BYTEPOS_UPDATE_COPY); - loopback_bytepos_update(dpcm_play, delta_play, BYTEPOS_UPDATE_POSONLY); - unlock: - spin_unlock_irqrestore(&cable->lock, flags); - return running; -} - -static void loopback_timer_function(unsigned long data) -{ - struct loopback_pcm *dpcm = (struct loopback_pcm *)data; - unsigned int running; - - running = loopback_pos_update(dpcm->cable); - if (running & (1 << dpcm->substream->stream)) { - loopback_timer_start(dpcm); - if (dpcm->period_update_pending) { - dpcm->period_update_pending = 0; - snd_pcm_period_elapsed(dpcm->substream); - } - } -} - -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; - - loopback_pos_update(dpcm->cable); - return bytes_to_frames(runtime, dpcm->buf_pos); -} - -static struct snd_pcm_hardware loopback_pcm_hardware = -{ - .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | - SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE), - .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | - 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, - /* note check overflow in frac_pos() using pcm_rate_shift before - changing period_bytes_max value */ - .period_bytes_max = 1024 * 1024, - .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) -{ - return snd_pcm_lib_alloc_vmalloc_buffer(substream, - params_buffer_bytes(params)); -} - -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); - return snd_pcm_lib_free_vmalloc_buffer(substream); -} - -static unsigned int get_cable_index(struct snd_pcm_substream *substream) -{ - if (!substream->pcm->device) - return substream->stream; - else - return !substream->stream; -} - -static int rule_format(struct snd_pcm_hw_params *params, - struct snd_pcm_hw_rule *rule) -{ - - struct snd_pcm_hardware *hw = rule->private; - struct snd_mask *maskp = hw_param_mask(params, rule->var); - - maskp->bits[0] &= (u_int32_t)hw->formats; - maskp->bits[1] &= (u_int32_t)(hw->formats >> 32); - memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ - if (! maskp->bits[0] && ! maskp->bits[1]) - return -EINVAL; - return 0; -} - -static int rule_rate(struct snd_pcm_hw_params *params, - struct snd_pcm_hw_rule *rule) -{ - struct snd_pcm_hardware *hw = rule->private; - struct snd_interval t; - - t.min = hw->rate_min; - t.max = hw->rate_max; - 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) -{ - struct snd_pcm_hardware *hw = rule->private; - struct snd_interval t; - - t.min = hw->channels_min; - t.max = hw->channels_max; - t.openmin = t.openmax = 0; - t.integer = 0; - return snd_interval_refine(hw_param_interval(params, rule->var), &t); -} - -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; - struct loopback_cable *cable; - 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; - setup_timer(&dpcm->timer, loopback_timer_function, - (unsigned long)dpcm); - - cable = loopback->cables[substream->number][dev]; - if (!cable) { - cable = kzalloc(sizeof(*cable), GFP_KERNEL); - if (!cable) { - kfree(dpcm); - err = -ENOMEM; - goto unlock; - } - spin_lock_init(&cable->lock); - cable->hw = loopback_pcm_hardware; - loopback->cables[substream->number][dev] = cable; - } - dpcm->cable = cable; - cable->streams[substream->stream] = dpcm; - - snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); - - /* 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, - rule_format, &runtime->hw, - SNDRV_PCM_HW_PARAM_FORMAT, -1); - if (err < 0) - goto unlock; - err = snd_pcm_hw_rule_add(runtime, 0, - SNDRV_PCM_HW_PARAM_RATE, - rule_rate, &runtime->hw, - SNDRV_PCM_HW_PARAM_RATE, -1); - if (err < 0) - goto unlock; - err = snd_pcm_hw_rule_add(runtime, 0, - SNDRV_PCM_HW_PARAM_CHANNELS, - rule_channels, &runtime->hw, - SNDRV_PCM_HW_PARAM_CHANNELS, -1); - if (err < 0) - goto unlock; - - runtime->private_data = dpcm; - runtime->private_free = loopback_runtime_free; - if (get_notify(dpcm)) - runtime->hw = loopback_pcm_hardware; - else - runtime->hw = cable->hw; - unlock: - 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; - struct loopback_cable *cable; - int dev = get_cable_index(substream); - - loopback_timer_stop(dpcm); - mutex_lock(&loopback->cable_lock); - cable = loopback->cables[substream->number][dev]; - if (cable->streams[!substream->stream]) { - /* other stream is still alive */ - cable->streams[substream->stream] = NULL; - } else { - /* free the cable */ - loopback->cables[substream->number][dev] = NULL; - kfree(cable); - } - mutex_unlock(&loopback->cable_lock); - return 0; -} - -static struct snd_pcm_ops loopback_playback_ops = { - .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, - .page = snd_pcm_lib_get_vmalloc_page, - .mmap = snd_pcm_lib_mmap_vmalloc, -}; - -static struct snd_pcm_ops loopback_capture_ops = { - .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, - .page = snd_pcm_lib_get_vmalloc_page, - .mmap = snd_pcm_lib_mmap_vmalloc, -}; - -static int __devinit loopback_pcm_new(struct loopback *loopback, - int device, int substreams) -{ - struct snd_pcm *pcm; - int err; - - err = snd_pcm_new(loopback->card, "Loopback PCM", device, - substreams, substreams, &pcm); - if (err < 0) - return err; - snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_playback_ops); - snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_capture_ops); - - pcm->private_data = loopback; - pcm->info_flags = 0; - strcpy(pcm->name, "Loopback PCM"); - - loopback->pcm[device] = pcm; - 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); - - ucontrol->value.integer.value[0] = - loopback->setup[kcontrol->id.subdevice] - [kcontrol->id.device].rate_shift; - 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); - - ucontrol->value.integer.value[0] = - loopback->setup[kcontrol->id.subdevice] - [kcontrol->id.device].notify; - 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; - if (val != loopback->setup[kcontrol->id.subdevice] - [kcontrol->id.device].notify) { - loopback->setup[kcontrol->id.subdevice] - [kcontrol->id.device].notify = val; - change = 1; - } - return change; -} - -static int loopback_active_get(struct snd_kcontrol *kcontrol, - struct snd_ctl_elem_value *ucontrol) -{ - struct loopback *loopback = snd_kcontrol_chip(kcontrol); - struct loopback_cable *cable = loopback->cables - [kcontrol->id.subdevice][kcontrol->id.device ^ 1]; - unsigned int val = 0; - - if (cable != NULL) - val = (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? - 1 : 0; - 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); - - ucontrol->value.integer.value[0] = - loopback->setup[kcontrol->id.subdevice] - [kcontrol->id.device].rate; - 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); - - ucontrol->value.integer.value[0] = - loopback->setup[kcontrol->id.subdevice] - [kcontrol->id.device].channels; - return 0; -} - -static struct snd_kcontrol_new loopback_controls[] __devinitdata = { -{ - .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 -} -}; - -static int __devinit loopback_mixer_new(struct loopback *loopback, int notify) -{ - 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; -} - -#ifdef CONFIG_PROC_FS - -static void print_dpcm_info(struct snd_info_buffer *buffer, - struct loopback_pcm *dpcm, - const char *id) -{ - snd_iprintf(buffer, " %s\n", id); - if (dpcm == NULL) { - snd_iprintf(buffer, " inactive\n"); - return; - } - snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size); - snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos); - snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size); - snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size); - snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps); - snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign); - snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift); - snd_iprintf(buffer, " update_pending:\t%u\n", - dpcm->period_update_pending); - snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos); - snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac); - snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n", - dpcm->last_jiffies, jiffies); - snd_iprintf(buffer, " timer_expires:\t%lu\n", 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:\n", num, sub); - if (cable == NULL) { - snd_iprintf(buffer, " inactive\n"); - return; - } - snd_iprintf(buffer, " valid: %u\n", cable->valid); - snd_iprintf(buffer, " running: %u\n", cable->running); - snd_iprintf(buffer, " pause: %u\n", cable->pause); - 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); -} - -static int __devinit loopback_proc_new(struct loopback *loopback, int cidx) -{ - char name[32]; - struct snd_info_entry *entry; - int err; - - snprintf(name, sizeof(name), "cable#%d", cidx); - err = snd_card_proc_new(loopback->card, name, &entry); - if (err < 0) - return err; - - snd_info_set_text_ops(entry, loopback, print_cable_info); - return 0; -} - -#else /* !CONFIG_PROC_FS */ - -#define loopback_proc_new(loopback, cidx) do { } while (0) - -#endif - -static int __devinit loopback_probe(struct platform_device *devptr) -{ - struct snd_card *card; - struct loopback *loopback; - int dev = devptr->id; - int err; - - err = snd_card_create(index[dev], id[dev], THIS_MODULE, - sizeof(struct loopback), &card); - 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; - loopback_proc_new(loopback, 0); - loopback_proc_new(loopback, 1); - 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; -} - -static int __devexit loopback_remove(struct platform_device *devptr) -{ - snd_card_free(platform_get_drvdata(devptr)); - platform_set_drvdata(devptr, NULL); - return 0; -} - -#ifdef CONFIG_PM -static int loopback_suspend(struct platform_device *pdev, - pm_message_t state) -{ - struct snd_card *card = platform_get_drvdata(pdev); - struct loopback *loopback = card->private_data; - - snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); - - snd_pcm_suspend_all(loopback->pcm[0]); - snd_pcm_suspend_all(loopback->pcm[1]); - return 0; -} - -static int loopback_resume(struct platform_device *pdev) -{ - struct snd_card *card = platform_get_drvdata(pdev); - - snd_power_change_state(card, SNDRV_CTL_POWER_D0); - return 0; -} -#endif - -#define SND_LOOPBACK_DRIVER "snd_aloop" - -static struct platform_driver loopback_driver = { - .probe = loopback_probe, - .remove = __devexit_p(loopback_remove), -#ifdef CONFIG_PM - .suspend = loopback_suspend, - .resume = loopback_resume, -#endif - .driver = { - .name = SND_LOOPBACK_DRIVER - }, -}; - -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\n"); -#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) |