1838 lines
52 KiB
C
1838 lines
52 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Loopback soundcard
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*
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* Original code:
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*
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* More accurate positioning and full-duplex support:
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* Copyright (c) Ahmet İnan <ainan at mathematik.uni-freiburg.de>
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*
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* Major (almost complete) rewrite:
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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*
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* A next major update in 2010 (separate timers for playback and capture):
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* Copyright (c) Jaroslav Kysela <perex@perex.cz>
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*/
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/wait.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#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>
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#include <sound/timer.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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MODULE_DESCRIPTION("A loopback soundcard");
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MODULE_LICENSE("GPL");
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#define MAX_PCM_SUBSTREAMS 8
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
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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};
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static int pcm_notify[SNDRV_CARDS];
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static char *timer_source[SNDRV_CARDS];
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for loopback soundcard.");
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module_param_array(id, charp, NULL, 0444);
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MODULE_PARM_DESC(id, "ID string for loopback soundcard.");
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module_param_array(enable, bool, NULL, 0444);
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MODULE_PARM_DESC(enable, "Enable this loopback soundcard.");
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module_param_array(pcm_substreams, int, NULL, 0444);
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MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for loopback driver.");
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module_param_array(pcm_notify, int, NULL, 0444);
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MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels changes.");
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module_param_array(timer_source, charp, NULL, 0444);
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MODULE_PARM_DESC(timer_source, "Sound card name or number and device/subdevice number of timer to be used. Empty string for jiffies timer [default].");
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#define NO_PITCH 100000
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#define CABLE_VALID_PLAYBACK BIT(SNDRV_PCM_STREAM_PLAYBACK)
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#define CABLE_VALID_CAPTURE BIT(SNDRV_PCM_STREAM_CAPTURE)
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#define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK | CABLE_VALID_CAPTURE)
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struct loopback_cable;
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struct loopback_pcm;
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struct loopback_ops {
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/* optional
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* call in loopback->cable_lock
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*/
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int (*open)(struct loopback_pcm *dpcm);
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/* required
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* call in cable->lock
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*/
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int (*start)(struct loopback_pcm *dpcm);
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/* required
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* call in cable->lock
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*/
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int (*stop)(struct loopback_pcm *dpcm);
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/* optional */
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int (*stop_sync)(struct loopback_pcm *dpcm);
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/* optional */
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int (*close_substream)(struct loopback_pcm *dpcm);
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/* optional
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* call in loopback->cable_lock
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*/
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int (*close_cable)(struct loopback_pcm *dpcm);
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/* optional
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* call in cable->lock
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*/
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unsigned int (*pos_update)(struct loopback_cable *cable);
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/* optional */
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void (*dpcm_info)(struct loopback_pcm *dpcm,
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struct snd_info_buffer *buffer);
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};
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struct loopback_cable {
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spinlock_t lock;
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struct loopback_pcm *streams[2];
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struct snd_pcm_hardware hw;
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/* flags */
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unsigned int valid;
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unsigned int running;
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unsigned int pause;
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/* timer specific */
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const struct loopback_ops *ops;
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/* If sound timer is used */
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struct {
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int stream;
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struct snd_timer_id id;
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struct work_struct event_work;
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struct snd_timer_instance *instance;
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} snd_timer;
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};
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struct loopback_setup {
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unsigned int notify: 1;
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unsigned int rate_shift;
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snd_pcm_format_t format;
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unsigned int rate;
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unsigned int channels;
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struct snd_ctl_elem_id active_id;
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struct snd_ctl_elem_id format_id;
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struct snd_ctl_elem_id rate_id;
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struct snd_ctl_elem_id channels_id;
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};
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struct loopback {
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struct snd_card *card;
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struct mutex cable_lock;
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struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2];
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struct snd_pcm *pcm[2];
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struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2];
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const char *timer_source;
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};
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struct loopback_pcm {
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struct loopback *loopback;
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struct snd_pcm_substream *substream;
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struct loopback_cable *cable;
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unsigned int pcm_buffer_size;
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unsigned int buf_pos; /* position in buffer */
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unsigned int silent_size;
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/* PCM parameters */
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unsigned int pcm_period_size;
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unsigned int pcm_bps; /* bytes per second */
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unsigned int pcm_salign; /* bytes per sample * channels */
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unsigned int pcm_rate_shift; /* rate shift value */
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/* flags */
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unsigned int period_update_pending :1;
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/* timer stuff */
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unsigned int irq_pos; /* fractional IRQ position in jiffies
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* ticks
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*/
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unsigned int period_size_frac; /* period size in jiffies ticks */
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unsigned int last_drift;
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unsigned long last_jiffies;
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/* If jiffies timer is used */
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struct timer_list timer;
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};
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static struct platform_device *devices[SNDRV_CARDS];
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static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x)
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{
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if (dpcm->pcm_rate_shift == NO_PITCH) {
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x /= HZ;
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} else {
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x = div_u64(NO_PITCH * (unsigned long long)x,
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HZ * (unsigned long long)dpcm->pcm_rate_shift);
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}
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return x - (x % dpcm->pcm_salign);
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}
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static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x)
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{
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if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */
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return x * HZ;
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} else {
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x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ,
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NO_PITCH);
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}
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return x;
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}
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static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm)
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{
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int device = dpcm->substream->pstr->pcm->device;
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if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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device ^= 1;
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return &dpcm->loopback->setup[dpcm->substream->number][device];
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}
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static inline unsigned int get_notify(struct loopback_pcm *dpcm)
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{
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return get_setup(dpcm)->notify;
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}
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static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm)
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{
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return get_setup(dpcm)->rate_shift;
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}
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/* call in cable->lock */
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static int loopback_jiffies_timer_start(struct loopback_pcm *dpcm)
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{
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unsigned long tick;
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unsigned int rate_shift = get_rate_shift(dpcm);
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if (rate_shift != dpcm->pcm_rate_shift) {
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dpcm->pcm_rate_shift = rate_shift;
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dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size);
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}
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if (dpcm->period_size_frac <= dpcm->irq_pos) {
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dpcm->irq_pos %= dpcm->period_size_frac;
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dpcm->period_update_pending = 1;
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}
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tick = dpcm->period_size_frac - dpcm->irq_pos;
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tick = DIV_ROUND_UP(tick, dpcm->pcm_bps);
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mod_timer(&dpcm->timer, jiffies + tick);
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return 0;
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}
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/* call in cable->lock */
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static int loopback_snd_timer_start(struct loopback_pcm *dpcm)
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{
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struct loopback_cable *cable = dpcm->cable;
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int err;
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/* Loopback device has to use same period as timer card. Therefore
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* wake up for each snd_pcm_period_elapsed() call of timer card.
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*/
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err = snd_timer_start(cable->snd_timer.instance, 1);
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if (err < 0) {
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/* do not report error if trying to start but already
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* running. For example called by opposite substream
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* of the same cable
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*/
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if (err == -EBUSY)
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return 0;
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pcm_err(dpcm->substream->pcm,
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"snd_timer_start(%d,%d,%d) failed with %d",
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cable->snd_timer.id.card,
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cable->snd_timer.id.device,
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cable->snd_timer.id.subdevice,
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err);
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}
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return err;
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}
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/* call in cable->lock */
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static inline int loopback_jiffies_timer_stop(struct loopback_pcm *dpcm)
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{
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del_timer(&dpcm->timer);
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dpcm->timer.expires = 0;
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return 0;
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}
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/* call in cable->lock */
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static int loopback_snd_timer_stop(struct loopback_pcm *dpcm)
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{
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struct loopback_cable *cable = dpcm->cable;
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int err;
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/* only stop if both devices (playback and capture) are not running */
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if (cable->running ^ cable->pause)
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return 0;
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err = snd_timer_stop(cable->snd_timer.instance);
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if (err < 0) {
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pcm_err(dpcm->substream->pcm,
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"snd_timer_stop(%d,%d,%d) failed with %d",
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cable->snd_timer.id.card,
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cable->snd_timer.id.device,
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cable->snd_timer.id.subdevice,
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err);
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}
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return err;
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}
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static inline int loopback_jiffies_timer_stop_sync(struct loopback_pcm *dpcm)
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{
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del_timer_sync(&dpcm->timer);
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return 0;
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}
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/* call in loopback->cable_lock */
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static int loopback_snd_timer_close_cable(struct loopback_pcm *dpcm)
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{
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struct loopback_cable *cable = dpcm->cable;
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/* snd_timer was not opened */
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if (!cable->snd_timer.instance)
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return 0;
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/* will only be called from free_cable() when other stream was
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* already closed. Other stream cannot be reopened as long as
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* loopback->cable_lock is locked. Therefore no need to lock
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* cable->lock;
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*/
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snd_timer_close(cable->snd_timer.instance);
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/* wait till drain work has finished if requested */
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cancel_work_sync(&cable->snd_timer.event_work);
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snd_timer_instance_free(cable->snd_timer.instance);
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memset(&cable->snd_timer, 0, sizeof(cable->snd_timer));
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return 0;
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}
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static int loopback_check_format(struct loopback_cable *cable, int stream)
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{
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struct snd_pcm_runtime *runtime, *cruntime;
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struct loopback_setup *setup;
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struct snd_card *card;
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int check;
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if (cable->valid != CABLE_VALID_BOTH) {
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if (stream == SNDRV_PCM_STREAM_PLAYBACK)
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goto __notify;
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return 0;
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}
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runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->
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substream->runtime;
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cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]->
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substream->runtime;
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check = runtime->format != cruntime->format ||
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runtime->rate != cruntime->rate ||
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runtime->channels != cruntime->channels;
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if (!check)
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return 0;
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if (stream == SNDRV_PCM_STREAM_CAPTURE) {
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return -EIO;
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} else {
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snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]->
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substream, SNDRV_PCM_STATE_DRAINING);
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__notify:
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runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->
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substream->runtime;
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setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]);
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card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card;
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if (setup->format != runtime->format) {
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snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
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&setup->format_id);
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setup->format = runtime->format;
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}
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if (setup->rate != runtime->rate) {
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snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
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&setup->rate_id);
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setup->rate = runtime->rate;
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}
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if (setup->channels != runtime->channels) {
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snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
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&setup->channels_id);
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setup->channels = runtime->channels;
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}
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}
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return 0;
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}
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static void loopback_active_notify(struct loopback_pcm *dpcm)
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{
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snd_ctl_notify(dpcm->loopback->card,
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SNDRV_CTL_EVENT_MASK_VALUE,
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&get_setup(dpcm)->active_id);
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}
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static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct loopback_pcm *dpcm = runtime->private_data;
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struct loopback_cable *cable = dpcm->cable;
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int err = 0, stream = 1 << substream->stream;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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err = loopback_check_format(cable, substream->stream);
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if (err < 0)
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return err;
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dpcm->last_jiffies = jiffies;
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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;
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cable->pause &= ~stream;
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err = cable->ops->start(dpcm);
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spin_unlock(&cable->lock);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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loopback_active_notify(dpcm);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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spin_lock(&cable->lock);
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cable->running &= ~stream;
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cable->pause &= ~stream;
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err = cable->ops->stop(dpcm);
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spin_unlock(&cable->lock);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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loopback_active_notify(dpcm);
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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);
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cable->pause |= stream;
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err = cable->ops->stop(dpcm);
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spin_unlock(&cable->lock);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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loopback_active_notify(dpcm);
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break;
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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case SNDRV_PCM_TRIGGER_RESUME:
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spin_lock(&cable->lock);
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dpcm->last_jiffies = jiffies;
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cable->pause &= ~stream;
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err = cable->ops->start(dpcm);
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spin_unlock(&cable->lock);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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loopback_active_notify(dpcm);
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break;
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default:
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return -EINVAL;
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}
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return err;
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}
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static void params_change(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct loopback_pcm *dpcm = runtime->private_data;
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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;
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cable->hw.rate_max = runtime->rate;
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cable->hw.channels_min = runtime->channels;
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cable->hw.channels_max = runtime->channels;
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if (cable->snd_timer.instance) {
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cable->hw.period_bytes_min =
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frames_to_bytes(runtime, runtime->period_size);
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cable->hw.period_bytes_max = cable->hw.period_bytes_min;
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}
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}
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static int loopback_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct loopback_pcm *dpcm = runtime->private_data;
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struct loopback_cable *cable = dpcm->cable;
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int err, bps, salign;
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if (cable->ops->stop_sync) {
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err = cable->ops->stop_sync(dpcm);
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if (err < 0)
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return err;
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}
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salign = (snd_pcm_format_physical_width(runtime->format) *
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runtime->channels) / 8;
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bps = salign * runtime->rate;
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if (bps <= 0 || salign <= 0)
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return -EINVAL;
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dpcm->buf_pos = 0;
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dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size);
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
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/* clear capture buffer */
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dpcm->silent_size = dpcm->pcm_buffer_size;
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snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
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runtime->buffer_size * runtime->channels);
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}
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dpcm->irq_pos = 0;
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dpcm->period_update_pending = 0;
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dpcm->pcm_bps = bps;
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dpcm->pcm_salign = salign;
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dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size);
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mutex_lock(&dpcm->loopback->cable_lock);
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if (!(cable->valid & ~(1 << substream->stream)) ||
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(get_setup(dpcm)->notify &&
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substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
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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->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;
|
|
}
|
|
}
|
|
|
|
static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm,
|
|
unsigned int jiffies_delta)
|
|
{
|
|
unsigned long last_pos;
|
|
unsigned int delta;
|
|
|
|
last_pos = byte_pos(dpcm, dpcm->irq_pos);
|
|
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;
|
|
if (dpcm->irq_pos >= dpcm->period_size_frac) {
|
|
dpcm->irq_pos %= dpcm->period_size_frac;
|
|
dpcm->period_update_pending = 1;
|
|
}
|
|
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;
|
|
}
|
|
|
|
/* call in cable->lock */
|
|
static unsigned int loopback_jiffies_timer_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, cur_jiffies;
|
|
unsigned int running, count1, count2;
|
|
|
|
cur_jiffies = jiffies;
|
|
running = cable->running ^ cable->pause;
|
|
if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) {
|
|
delta_play = cur_jiffies - dpcm_play->last_jiffies;
|
|
dpcm_play->last_jiffies += delta_play;
|
|
}
|
|
|
|
if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) {
|
|
delta_capt = cur_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) {
|
|
count1 = bytepos_delta(dpcm_play, delta_play - delta_capt);
|
|
bytepos_finish(dpcm_play, count1);
|
|
delta_play = delta_capt;
|
|
} else if (delta_play < delta_capt) {
|
|
count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play);
|
|
clear_capture_buf(dpcm_capt, count1);
|
|
bytepos_finish(dpcm_capt, count1);
|
|
delta_capt = delta_play;
|
|
}
|
|
|
|
if (delta_play == 0 && delta_capt == 0)
|
|
goto unlock;
|
|
|
|
/* note delta_capt == delta_play at this moment */
|
|
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);
|
|
unlock:
|
|
return running;
|
|
}
|
|
|
|
static void loopback_jiffies_timer_function(struct timer_list *t)
|
|
{
|
|
struct loopback_pcm *dpcm = from_timer(dpcm, t, timer);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dpcm->cable->lock, flags);
|
|
if (loopback_jiffies_timer_pos_update(dpcm->cable) &
|
|
(1 << dpcm->substream->stream)) {
|
|
loopback_jiffies_timer_start(dpcm);
|
|
if (dpcm->period_update_pending) {
|
|
dpcm->period_update_pending = 0;
|
|
spin_unlock_irqrestore(&dpcm->cable->lock, flags);
|
|
/* need to unlock before calling below */
|
|
snd_pcm_period_elapsed(dpcm->substream);
|
|
return;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&dpcm->cable->lock, flags);
|
|
}
|
|
|
|
/* call in cable->lock */
|
|
static int loopback_snd_timer_check_resolution(struct snd_pcm_runtime *runtime,
|
|
unsigned long resolution)
|
|
{
|
|
if (resolution != runtime->timer_resolution) {
|
|
struct loopback_pcm *dpcm = runtime->private_data;
|
|
struct loopback_cable *cable = dpcm->cable;
|
|
/* Worst case estimation of possible values for resolution
|
|
* resolution <= (512 * 1024) frames / 8kHz in nsec
|
|
* resolution <= 65.536.000.000 nsec
|
|
*
|
|
* period_size <= 65.536.000.000 nsec / 1000nsec/usec * 192kHz +
|
|
* 500.000
|
|
* period_size <= 12.582.912.000.000 <64bit
|
|
* / 1.000.000 usec/sec
|
|
*/
|
|
snd_pcm_uframes_t period_size_usec =
|
|
resolution / 1000 * runtime->rate;
|
|
/* round to nearest sample rate */
|
|
snd_pcm_uframes_t period_size =
|
|
(period_size_usec + 500 * 1000) / (1000 * 1000);
|
|
|
|
pcm_err(dpcm->substream->pcm,
|
|
"Period size (%lu frames) of loopback device is not corresponding to timer resolution (%lu nsec = %lu frames) of card timer %d,%d,%d. Use period size of %lu frames for loopback device.",
|
|
runtime->period_size, resolution, period_size,
|
|
cable->snd_timer.id.card,
|
|
cable->snd_timer.id.device,
|
|
cable->snd_timer.id.subdevice,
|
|
period_size);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void loopback_snd_timer_period_elapsed(struct loopback_cable *cable,
|
|
int event,
|
|
unsigned long resolution)
|
|
{
|
|
struct loopback_pcm *dpcm_play, *dpcm_capt;
|
|
struct snd_pcm_substream *substream_play, *substream_capt;
|
|
struct snd_pcm_runtime *valid_runtime;
|
|
unsigned int running, elapsed_bytes;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cable->lock, flags);
|
|
running = cable->running ^ cable->pause;
|
|
/* no need to do anything if no stream is running */
|
|
if (!running) {
|
|
spin_unlock_irqrestore(&cable->lock, flags);
|
|
return;
|
|
}
|
|
|
|
dpcm_play = cable->streams[SNDRV_PCM_STREAM_PLAYBACK];
|
|
dpcm_capt = cable->streams[SNDRV_PCM_STREAM_CAPTURE];
|
|
|
|
if (event == SNDRV_TIMER_EVENT_MSTOP) {
|
|
if (!dpcm_play ||
|
|
dpcm_play->substream->runtime->state !=
|
|
SNDRV_PCM_STATE_DRAINING) {
|
|
spin_unlock_irqrestore(&cable->lock, flags);
|
|
return;
|
|
}
|
|
}
|
|
|
|
substream_play = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ?
|
|
dpcm_play->substream : NULL;
|
|
substream_capt = (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) ?
|
|
dpcm_capt->substream : NULL;
|
|
valid_runtime = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ?
|
|
dpcm_play->substream->runtime :
|
|
dpcm_capt->substream->runtime;
|
|
|
|
/* resolution is only valid for SNDRV_TIMER_EVENT_TICK events */
|
|
if (event == SNDRV_TIMER_EVENT_TICK) {
|
|
/* The hardware rules guarantee that playback and capture period
|
|
* are the same. Therefore only one device has to be checked
|
|
* here.
|
|
*/
|
|
if (loopback_snd_timer_check_resolution(valid_runtime,
|
|
resolution) < 0) {
|
|
spin_unlock_irqrestore(&cable->lock, flags);
|
|
if (substream_play)
|
|
snd_pcm_stop_xrun(substream_play);
|
|
if (substream_capt)
|
|
snd_pcm_stop_xrun(substream_capt);
|
|
return;
|
|
}
|
|
}
|
|
|
|
elapsed_bytes = frames_to_bytes(valid_runtime,
|
|
valid_runtime->period_size);
|
|
/* The same timer interrupt is used for playback and capture device */
|
|
if ((running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) &&
|
|
(running & (1 << SNDRV_PCM_STREAM_CAPTURE))) {
|
|
copy_play_buf(dpcm_play, dpcm_capt, elapsed_bytes);
|
|
bytepos_finish(dpcm_play, elapsed_bytes);
|
|
bytepos_finish(dpcm_capt, elapsed_bytes);
|
|
} else if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) {
|
|
bytepos_finish(dpcm_play, elapsed_bytes);
|
|
} else if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) {
|
|
clear_capture_buf(dpcm_capt, elapsed_bytes);
|
|
bytepos_finish(dpcm_capt, elapsed_bytes);
|
|
}
|
|
spin_unlock_irqrestore(&cable->lock, flags);
|
|
|
|
if (substream_play)
|
|
snd_pcm_period_elapsed(substream_play);
|
|
if (substream_capt)
|
|
snd_pcm_period_elapsed(substream_capt);
|
|
}
|
|
|
|
static void loopback_snd_timer_function(struct snd_timer_instance *timeri,
|
|
unsigned long resolution,
|
|
unsigned long ticks)
|
|
{
|
|
struct loopback_cable *cable = timeri->callback_data;
|
|
|
|
loopback_snd_timer_period_elapsed(cable, SNDRV_TIMER_EVENT_TICK,
|
|
resolution);
|
|
}
|
|
|
|
static void loopback_snd_timer_work(struct work_struct *work)
|
|
{
|
|
struct loopback_cable *cable;
|
|
|
|
cable = container_of(work, struct loopback_cable, snd_timer.event_work);
|
|
loopback_snd_timer_period_elapsed(cable, SNDRV_TIMER_EVENT_MSTOP, 0);
|
|
}
|
|
|
|
static void loopback_snd_timer_event(struct snd_timer_instance *timeri,
|
|
int event,
|
|
struct timespec64 *tstamp,
|
|
unsigned long resolution)
|
|
{
|
|
/* Do not lock cable->lock here because timer->lock is already hold.
|
|
* There are other functions which first lock cable->lock and than
|
|
* timer->lock e.g.
|
|
* loopback_trigger()
|
|
* spin_lock(&cable->lock)
|
|
* loopback_snd_timer_start()
|
|
* snd_timer_start()
|
|
* spin_lock(&timer->lock)
|
|
* Therefore when using the oposit order of locks here it could result
|
|
* in a deadlock.
|
|
*/
|
|
|
|
if (event == SNDRV_TIMER_EVENT_MSTOP) {
|
|
struct loopback_cable *cable = timeri->callback_data;
|
|
|
|
/* sound card of the timer was stopped. Therefore there will not
|
|
* be any further timer callbacks. Due to this forward audio
|
|
* data from here if in draining state. When still in running
|
|
* state the streaming will be aborted by the usual timeout. It
|
|
* should not be aborted here because may be the timer sound
|
|
* card does only a recovery and the timer is back soon.
|
|
* This work triggers loopback_snd_timer_work()
|
|
*/
|
|
schedule_work(&cable->snd_timer.event_work);
|
|
}
|
|
}
|
|
|
|
static void loopback_jiffies_timer_dpcm_info(struct loopback_pcm *dpcm,
|
|
struct snd_info_buffer *buffer)
|
|
{
|
|
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 loopback_snd_timer_dpcm_info(struct loopback_pcm *dpcm,
|
|
struct snd_info_buffer *buffer)
|
|
{
|
|
struct loopback_cable *cable = dpcm->cable;
|
|
|
|
snd_iprintf(buffer, " sound timer:\thw:%d,%d,%d\n",
|
|
cable->snd_timer.id.card,
|
|
cable->snd_timer.id.device,
|
|
cable->snd_timer.id.subdevice);
|
|
snd_iprintf(buffer, " timer open:\t\t%s\n",
|
|
(cable->snd_timer.stream == SNDRV_PCM_STREAM_CAPTURE) ?
|
|
"capture" : "playback");
|
|
}
|
|
|
|
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;
|
|
snd_pcm_uframes_t pos;
|
|
|
|
spin_lock(&dpcm->cable->lock);
|
|
if (dpcm->cable->ops->pos_update)
|
|
dpcm->cable->ops->pos_update(dpcm->cable);
|
|
pos = dpcm->buf_pos;
|
|
spin_unlock(&dpcm->cable->lock);
|
|
return bytes_to_frames(runtime, pos);
|
|
}
|
|
|
|
static const 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 |
|
|
SNDRV_PCM_INFO_RESUME),
|
|
.formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
|
|
SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |
|
|
SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |
|
|
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_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 0;
|
|
}
|
|
|
|
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 loopback_pcm *dpcm = rule->private;
|
|
struct loopback_cable *cable = dpcm->cable;
|
|
struct snd_mask m;
|
|
|
|
snd_mask_none(&m);
|
|
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);
|
|
return snd_mask_refine(hw_param_mask(params, rule->var), &m);
|
|
}
|
|
|
|
static int rule_rate(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
struct loopback_pcm *dpcm = rule->private;
|
|
struct loopback_cable *cable = dpcm->cable;
|
|
struct snd_interval t;
|
|
|
|
mutex_lock(&dpcm->loopback->cable_lock);
|
|
t.min = cable->hw.rate_min;
|
|
t.max = cable->hw.rate_max;
|
|
mutex_unlock(&dpcm->loopback->cable_lock);
|
|
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 loopback_pcm *dpcm = rule->private;
|
|
struct loopback_cable *cable = dpcm->cable;
|
|
struct snd_interval t;
|
|
|
|
mutex_lock(&dpcm->loopback->cable_lock);
|
|
t.min = cable->hw.channels_min;
|
|
t.max = cable->hw.channels_max;
|
|
mutex_unlock(&dpcm->loopback->cable_lock);
|
|
t.openmin = t.openmax = 0;
|
|
t.integer = 0;
|
|
return snd_interval_refine(hw_param_interval(params, rule->var), &t);
|
|
}
|
|
|
|
static int rule_period_bytes(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
struct loopback_pcm *dpcm = rule->private;
|
|
struct loopback_cable *cable = dpcm->cable;
|
|
struct snd_interval t;
|
|
|
|
mutex_lock(&dpcm->loopback->cable_lock);
|
|
t.min = cable->hw.period_bytes_min;
|
|
t.max = cable->hw.period_bytes_max;
|
|
mutex_unlock(&dpcm->loopback->cable_lock);
|
|
t.openmin = 0;
|
|
t.openmax = 0;
|
|
t.integer = 0;
|
|
return snd_interval_refine(hw_param_interval(params, rule->var), &t);
|
|
}
|
|
|
|
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 */
|
|
spin_lock_irq(&cable->lock);
|
|
cable->streams[substream->stream] = NULL;
|
|
spin_unlock_irq(&cable->lock);
|
|
} else {
|
|
struct loopback_pcm *dpcm = substream->runtime->private_data;
|
|
|
|
if (cable->ops && cable->ops->close_cable && dpcm)
|
|
cable->ops->close_cable(dpcm);
|
|
/* free the cable */
|
|
loopback->cables[substream->number][dev] = NULL;
|
|
kfree(cable);
|
|
}
|
|
}
|
|
|
|
static int loopback_jiffies_timer_open(struct loopback_pcm *dpcm)
|
|
{
|
|
timer_setup(&dpcm->timer, loopback_jiffies_timer_function, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct loopback_ops loopback_jiffies_timer_ops = {
|
|
.open = loopback_jiffies_timer_open,
|
|
.start = loopback_jiffies_timer_start,
|
|
.stop = loopback_jiffies_timer_stop,
|
|
.stop_sync = loopback_jiffies_timer_stop_sync,
|
|
.close_substream = loopback_jiffies_timer_stop_sync,
|
|
.pos_update = loopback_jiffies_timer_pos_update,
|
|
.dpcm_info = loopback_jiffies_timer_dpcm_info,
|
|
};
|
|
|
|
static int loopback_parse_timer_id(const char *str,
|
|
struct snd_timer_id *tid)
|
|
{
|
|
/* [<pref>:](<card name>|<card idx>)[{.,}<dev idx>[{.,}<subdev idx>]] */
|
|
const char * const sep_dev = ".,";
|
|
const char * const sep_pref = ":";
|
|
const char *name = str;
|
|
char *sep, save = '\0';
|
|
int card_idx = 0, dev = 0, subdev = 0;
|
|
int err;
|
|
|
|
sep = strpbrk(str, sep_pref);
|
|
if (sep)
|
|
name = sep + 1;
|
|
sep = strpbrk(name, sep_dev);
|
|
if (sep) {
|
|
save = *sep;
|
|
*sep = '\0';
|
|
}
|
|
err = kstrtoint(name, 0, &card_idx);
|
|
if (err == -EINVAL) {
|
|
/* Must be the name, not number */
|
|
for (card_idx = 0; card_idx < snd_ecards_limit; card_idx++) {
|
|
struct snd_card *card = snd_card_ref(card_idx);
|
|
|
|
if (card) {
|
|
if (!strcmp(card->id, name))
|
|
err = 0;
|
|
snd_card_unref(card);
|
|
}
|
|
if (!err)
|
|
break;
|
|
}
|
|
}
|
|
if (sep) {
|
|
*sep = save;
|
|
if (!err) {
|
|
char *sep2, save2 = '\0';
|
|
|
|
sep2 = strpbrk(sep + 1, sep_dev);
|
|
if (sep2) {
|
|
save2 = *sep2;
|
|
*sep2 = '\0';
|
|
}
|
|
err = kstrtoint(sep + 1, 0, &dev);
|
|
if (sep2) {
|
|
*sep2 = save2;
|
|
if (!err)
|
|
err = kstrtoint(sep2 + 1, 0, &subdev);
|
|
}
|
|
}
|
|
}
|
|
if (!err && tid) {
|
|
tid->card = card_idx;
|
|
tid->device = dev;
|
|
tid->subdevice = subdev;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/* call in loopback->cable_lock */
|
|
static int loopback_snd_timer_open(struct loopback_pcm *dpcm)
|
|
{
|
|
int err = 0;
|
|
struct snd_timer_id tid = {
|
|
.dev_class = SNDRV_TIMER_CLASS_PCM,
|
|
.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION,
|
|
};
|
|
struct snd_timer_instance *timeri;
|
|
struct loopback_cable *cable = dpcm->cable;
|
|
|
|
/* check if timer was already opened. It is only opened once
|
|
* per playback and capture subdevice (aka cable).
|
|
*/
|
|
if (cable->snd_timer.instance)
|
|
goto exit;
|
|
|
|
err = loopback_parse_timer_id(dpcm->loopback->timer_source, &tid);
|
|
if (err < 0) {
|
|
pcm_err(dpcm->substream->pcm,
|
|
"Parsing timer source \'%s\' failed with %d",
|
|
dpcm->loopback->timer_source, err);
|
|
goto exit;
|
|
}
|
|
|
|
cable->snd_timer.stream = dpcm->substream->stream;
|
|
cable->snd_timer.id = tid;
|
|
|
|
timeri = snd_timer_instance_new(dpcm->loopback->card->id);
|
|
if (!timeri) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
/* The callback has to be called from another work. If
|
|
* SNDRV_TIMER_IFLG_FAST is specified it will be called from the
|
|
* snd_pcm_period_elapsed() call of the selected sound card.
|
|
* snd_pcm_period_elapsed() helds snd_pcm_stream_lock_irqsave().
|
|
* Due to our callback loopback_snd_timer_function() also calls
|
|
* snd_pcm_period_elapsed() which calls snd_pcm_stream_lock_irqsave().
|
|
* This would end up in a dead lock.
|
|
*/
|
|
timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
|
|
timeri->callback = loopback_snd_timer_function;
|
|
timeri->callback_data = (void *)cable;
|
|
timeri->ccallback = loopback_snd_timer_event;
|
|
|
|
/* initialise a work used for draining */
|
|
INIT_WORK(&cable->snd_timer.event_work, loopback_snd_timer_work);
|
|
|
|
/* The mutex loopback->cable_lock is kept locked.
|
|
* Therefore snd_timer_open() cannot be called a second time
|
|
* by the other device of the same cable.
|
|
* Therefore the following issue cannot happen:
|
|
* [proc1] Call loopback_timer_open() ->
|
|
* Unlock cable->lock for snd_timer_close/open() call
|
|
* [proc2] Call loopback_timer_open() -> snd_timer_open(),
|
|
* snd_timer_start()
|
|
* [proc1] Call snd_timer_open() and overwrite running timer
|
|
* instance
|
|
*/
|
|
err = snd_timer_open(timeri, &cable->snd_timer.id, current->pid);
|
|
if (err < 0) {
|
|
pcm_err(dpcm->substream->pcm,
|
|
"snd_timer_open (%d,%d,%d) failed with %d",
|
|
cable->snd_timer.id.card,
|
|
cable->snd_timer.id.device,
|
|
cable->snd_timer.id.subdevice,
|
|
err);
|
|
snd_timer_instance_free(timeri);
|
|
goto exit;
|
|
}
|
|
|
|
cable->snd_timer.instance = timeri;
|
|
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
/* stop_sync() is not required for sound timer because it does not need to be
|
|
* restarted in loopback_prepare() on Xrun recovery
|
|
*/
|
|
static const struct loopback_ops loopback_snd_timer_ops = {
|
|
.open = loopback_snd_timer_open,
|
|
.start = loopback_snd_timer_start,
|
|
.stop = loopback_snd_timer_stop,
|
|
.close_cable = loopback_snd_timer_close_cable,
|
|
.dpcm_info = loopback_snd_timer_dpcm_info,
|
|
};
|
|
|
|
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 = NULL;
|
|
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;
|
|
|
|
cable = loopback->cables[substream->number][dev];
|
|
if (!cable) {
|
|
cable = kzalloc(sizeof(*cable), GFP_KERNEL);
|
|
if (!cable) {
|
|
err = -ENOMEM;
|
|
goto unlock;
|
|
}
|
|
spin_lock_init(&cable->lock);
|
|
cable->hw = loopback_pcm_hardware;
|
|
if (loopback->timer_source)
|
|
cable->ops = &loopback_snd_timer_ops;
|
|
else
|
|
cable->ops = &loopback_jiffies_timer_ops;
|
|
loopback->cables[substream->number][dev] = cable;
|
|
}
|
|
dpcm->cable = cable;
|
|
runtime->private_data = dpcm;
|
|
|
|
if (cable->ops->open) {
|
|
err = cable->ops->open(dpcm);
|
|
if (err < 0)
|
|
goto unlock;
|
|
}
|
|
|
|
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, dpcm,
|
|
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, dpcm,
|
|
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, dpcm,
|
|
SNDRV_PCM_HW_PARAM_CHANNELS, -1);
|
|
if (err < 0)
|
|
goto unlock;
|
|
|
|
/* In case of sound timer the period time of both devices of the same
|
|
* loop has to be the same.
|
|
* This rule only takes effect if a sound timer was chosen
|
|
*/
|
|
if (cable->snd_timer.instance) {
|
|
err = snd_pcm_hw_rule_add(runtime, 0,
|
|
SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
|
|
rule_period_bytes, dpcm,
|
|
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1);
|
|
if (err < 0)
|
|
goto unlock;
|
|
}
|
|
|
|
/* loopback_runtime_free() has not to be called if kfree(dpcm) was
|
|
* already called here. Otherwise it will end up with a double free.
|
|
*/
|
|
runtime->private_free = loopback_runtime_free;
|
|
if (get_notify(dpcm))
|
|
runtime->hw = loopback_pcm_hardware;
|
|
else
|
|
runtime->hw = cable->hw;
|
|
|
|
spin_lock_irq(&cable->lock);
|
|
cable->streams[substream->stream] = dpcm;
|
|
spin_unlock_irq(&cable->lock);
|
|
|
|
unlock:
|
|
if (err < 0) {
|
|
free_cable(substream);
|
|
kfree(dpcm);
|
|
}
|
|
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;
|
|
int err = 0;
|
|
|
|
if (dpcm->cable->ops->close_substream)
|
|
err = dpcm->cable->ops->close_substream(dpcm);
|
|
mutex_lock(&loopback->cable_lock);
|
|
free_cable(substream);
|
|
mutex_unlock(&loopback->cable_lock);
|
|
return err;
|
|
}
|
|
|
|
static const struct snd_pcm_ops loopback_pcm_ops = {
|
|
.open = loopback_open,
|
|
.close = loopback_close,
|
|
.hw_free = loopback_hw_free,
|
|
.prepare = loopback_prepare,
|
|
.trigger = loopback_trigger,
|
|
.pointer = loopback_pointer,
|
|
};
|
|
|
|
static int 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_pcm_ops);
|
|
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_pcm_ops);
|
|
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
|
|
|
|
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);
|
|
|
|
mutex_lock(&loopback->cable_lock);
|
|
ucontrol->value.integer.value[0] =
|
|
loopback->setup[kcontrol->id.subdevice]
|
|
[kcontrol->id.device].rate_shift;
|
|
mutex_unlock(&loopback->cable_lock);
|
|
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);
|
|
|
|
mutex_lock(&loopback->cable_lock);
|
|
ucontrol->value.integer.value[0] =
|
|
loopback->setup[kcontrol->id.subdevice]
|
|
[kcontrol->id.device].notify;
|
|
mutex_unlock(&loopback->cable_lock);
|
|
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;
|
|
mutex_lock(&loopback->cable_lock);
|
|
if (val != loopback->setup[kcontrol->id.subdevice]
|
|
[kcontrol->id.device].notify) {
|
|
loopback->setup[kcontrol->id.subdevice]
|
|
[kcontrol->id.device].notify = val;
|
|
change = 1;
|
|
}
|
|
mutex_unlock(&loopback->cable_lock);
|
|
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;
|
|
|
|
unsigned int val = 0;
|
|
|
|
mutex_lock(&loopback->cable_lock);
|
|
cable = loopback->cables[kcontrol->id.subdevice][kcontrol->id.device ^ 1];
|
|
if (cable != NULL) {
|
|
unsigned int running = cable->running ^ cable->pause;
|
|
|
|
val = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? 1 : 0;
|
|
}
|
|
mutex_unlock(&loopback->cable_lock);
|
|
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 = (__force int)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] =
|
|
(__force int)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);
|
|
|
|
mutex_lock(&loopback->cable_lock);
|
|
ucontrol->value.integer.value[0] =
|
|
loopback->setup[kcontrol->id.subdevice]
|
|
[kcontrol->id.device].rate;
|
|
mutex_unlock(&loopback->cable_lock);
|
|
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);
|
|
|
|
mutex_lock(&loopback->cable_lock);
|
|
ucontrol->value.integer.value[0] =
|
|
loopback->setup[kcontrol->id.subdevice]
|
|
[kcontrol->id.device].channels;
|
|
mutex_unlock(&loopback->cable_lock);
|
|
return 0;
|
|
}
|
|
|
|
static const struct snd_kcontrol_new loopback_controls[] = {
|
|
{
|
|
.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 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;
|
|
|
|
/* Add the control before copying the id so that
|
|
* the numid field of the id is set in the copy.
|
|
*/
|
|
err = snd_ctl_add(card, kctl);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
if (dpcm->cable->ops->dpcm_info)
|
|
dpcm->cable->ops->dpcm_info(dpcm, buffer);
|
|
}
|
|
|
|
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 loopback_cable_proc_new(struct loopback *loopback, int cidx)
|
|
{
|
|
char name[32];
|
|
|
|
snprintf(name, sizeof(name), "cable#%d", cidx);
|
|
return snd_card_ro_proc_new(loopback->card, name, loopback,
|
|
print_cable_info);
|
|
}
|
|
|
|
static void loopback_set_timer_source(struct loopback *loopback,
|
|
const char *value)
|
|
{
|
|
if (loopback->timer_source) {
|
|
devm_kfree(loopback->card->dev, loopback->timer_source);
|
|
loopback->timer_source = NULL;
|
|
}
|
|
if (value && *value)
|
|
loopback->timer_source = devm_kstrdup(loopback->card->dev,
|
|
value, GFP_KERNEL);
|
|
}
|
|
|
|
static void print_timer_source_info(struct snd_info_entry *entry,
|
|
struct snd_info_buffer *buffer)
|
|
{
|
|
struct loopback *loopback = entry->private_data;
|
|
|
|
mutex_lock(&loopback->cable_lock);
|
|
snd_iprintf(buffer, "%s\n",
|
|
loopback->timer_source ? loopback->timer_source : "");
|
|
mutex_unlock(&loopback->cable_lock);
|
|
}
|
|
|
|
static void change_timer_source_info(struct snd_info_entry *entry,
|
|
struct snd_info_buffer *buffer)
|
|
{
|
|
struct loopback *loopback = entry->private_data;
|
|
char line[64];
|
|
|
|
mutex_lock(&loopback->cable_lock);
|
|
if (!snd_info_get_line(buffer, line, sizeof(line)))
|
|
loopback_set_timer_source(loopback, strim(line));
|
|
mutex_unlock(&loopback->cable_lock);
|
|
}
|
|
|
|
static int loopback_timer_source_proc_new(struct loopback *loopback)
|
|
{
|
|
return snd_card_rw_proc_new(loopback->card, "timer_source", loopback,
|
|
print_timer_source_info,
|
|
change_timer_source_info);
|
|
}
|
|
|
|
static int loopback_probe(struct platform_device *devptr)
|
|
{
|
|
struct snd_card *card;
|
|
struct loopback *loopback;
|
|
int dev = devptr->id;
|
|
int err;
|
|
|
|
err = snd_devm_card_new(&devptr->dev, 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;
|
|
loopback_set_timer_source(loopback, timer_source[dev]);
|
|
|
|
mutex_init(&loopback->cable_lock);
|
|
|
|
err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]);
|
|
if (err < 0)
|
|
return err;
|
|
err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]);
|
|
if (err < 0)
|
|
return err;
|
|
err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0);
|
|
if (err < 0)
|
|
return err;
|
|
loopback_cable_proc_new(loopback, 0);
|
|
loopback_cable_proc_new(loopback, 1);
|
|
loopback_timer_source_proc_new(loopback);
|
|
strcpy(card->driver, "Loopback");
|
|
strcpy(card->shortname, "Loopback");
|
|
sprintf(card->longname, "Loopback %i", dev + 1);
|
|
err = snd_card_register(card);
|
|
if (err < 0)
|
|
return err;
|
|
platform_set_drvdata(devptr, card);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int loopback_suspend(struct device *pdev)
|
|
{
|
|
struct snd_card *card = dev_get_drvdata(pdev);
|
|
|
|
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
|
|
return 0;
|
|
}
|
|
|
|
static int loopback_resume(struct device *pdev)
|
|
{
|
|
struct snd_card *card = dev_get_drvdata(pdev);
|
|
|
|
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume);
|
|
#define LOOPBACK_PM_OPS &loopback_pm
|
|
#else
|
|
#define LOOPBACK_PM_OPS NULL
|
|
#endif
|
|
|
|
#define SND_LOOPBACK_DRIVER "snd_aloop"
|
|
|
|
static struct platform_driver loopback_driver = {
|
|
.probe = loopback_probe,
|
|
.driver = {
|
|
.name = SND_LOOPBACK_DRIVER,
|
|
.pm = LOOPBACK_PM_OPS,
|
|
},
|
|
};
|
|
|
|
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)
|