76 	int (*open)(struct loopback_pcm *dpcm);
80 	int (*start)(struct loopback_pcm *dpcm);
84 	int (*stop)(struct loopback_pcm *dpcm);
86 	int (*stop_sync)(struct loopback_pcm *dpcm);
88 	int (*close_substream)(struct loopback_pcm *dpcm);
92 	int (*close_cable)(struct loopback_pcm *dpcm);
98 	void (*dpcm_info)(struct loopback_pcm *dpcm,
185 static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x)  in byte_pos()  argument
187 	if (dpcm->pcm_rate_shift == NO_PITCH) {  in byte_pos()
191 			    HZ * (unsigned long long)dpcm->pcm_rate_shift);  in byte_pos()
193 	return x - (x % dpcm->pcm_salign);  in byte_pos()
196 static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x)  in frac_pos()  argument
198 	if (dpcm->pcm_rate_shift == NO_PITCH) {	/* no pitch */  in frac_pos()
201 		x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ,  in frac_pos()
207 static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm)  in get_setup()  argument
209 	int device = dpcm->substream->pstr->pcm->device;  in get_setup()
211 	if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK)  in get_setup()
213 	return &dpcm->loopback->setup[dpcm->substream->number][device];  in get_setup()
216 static inline unsigned int get_notify(struct loopback_pcm *dpcm)  in get_notify()  argument
218 	return get_setup(dpcm)->notify;  in get_notify()
221 static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm)  in get_rate_shift()  argument
223 	return get_setup(dpcm)->rate_shift;  in get_rate_shift()
227 static int loopback_jiffies_timer_start(struct loopback_pcm *dpcm)  in loopback_jiffies_timer_start()  argument
230 	unsigned int rate_shift = get_rate_shift(dpcm);  in loopback_jiffies_timer_start()
232 	if (rate_shift != dpcm->pcm_rate_shift) {  in loopback_jiffies_timer_start()
233 		dpcm->pcm_rate_shift = rate_shift;  in loopback_jiffies_timer_start()
234 		dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size);  in loopback_jiffies_timer_start()
236 	if (dpcm->period_size_frac <= dpcm->irq_pos) {  in loopback_jiffies_timer_start()
237 		dpcm->irq_pos %= dpcm->period_size_frac;  in loopback_jiffies_timer_start()
238 		dpcm->period_update_pending = 1;  in loopback_jiffies_timer_start()
240 	tick = dpcm->period_size_frac - dpcm->irq_pos;  in loopback_jiffies_timer_start()
241 	tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps;  in loopback_jiffies_timer_start()
242 	mod_timer(&dpcm->timer, jiffies + tick);  in loopback_jiffies_timer_start()
248 static int loopback_snd_timer_start(struct loopback_pcm *dpcm)  in loopback_snd_timer_start()  argument
250 	struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_start()
265 		pcm_err(dpcm->substream->pcm,  in loopback_snd_timer_start()
277 static inline int loopback_jiffies_timer_stop(struct loopback_pcm *dpcm)  in loopback_jiffies_timer_stop()  argument
279 	del_timer(&dpcm->timer);  in loopback_jiffies_timer_stop()
280 	dpcm->timer.expires = 0;  in loopback_jiffies_timer_stop()
286 static int loopback_snd_timer_stop(struct loopback_pcm *dpcm)  in loopback_snd_timer_stop()  argument
288 	struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_stop()
297 		pcm_err(dpcm->substream->pcm,  in loopback_snd_timer_stop()
308 static inline int loopback_jiffies_timer_stop_sync(struct loopback_pcm *dpcm)  in loopback_jiffies_timer_stop_sync()  argument
310 	del_timer_sync(&dpcm->timer);  in loopback_jiffies_timer_stop_sync()
316 static int loopback_snd_timer_close_cable(struct loopback_pcm *dpcm)  in loopback_snd_timer_close_cable()  argument
318 	struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_close_cable()
390 static void loopback_active_notify(struct loopback_pcm *dpcm)  in loopback_active_notify()  argument
392 	snd_ctl_notify(dpcm->loopback->card,  in loopback_active_notify()
394 		       &get_setup(dpcm)->active_id);  in loopback_active_notify()
400 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_trigger()  local
401 	struct loopback_cable *cable = dpcm->cable;  in loopback_trigger()
409 		dpcm->last_jiffies = cycles_to_jiffies();  in loopback_trigger()
410 		dpcm->pcm_rate_shift = 0;  in loopback_trigger()
411 		dpcm->last_drift = 0;  in loopback_trigger()
415 		err = cable->ops->start(dpcm);  in loopback_trigger()
418 			loopback_active_notify(dpcm);  in loopback_trigger()
424 		err = cable->ops->stop(dpcm);  in loopback_trigger()
427 			loopback_active_notify(dpcm);  in loopback_trigger()
433 		err = cable->ops->stop(dpcm);  in loopback_trigger()
436 			loopback_active_notify(dpcm);  in loopback_trigger()
441 		dpcm->last_jiffies = cycles_to_jiffies();  in loopback_trigger()
443 		err = cable->ops->start(dpcm);  in loopback_trigger()
446 			loopback_active_notify(dpcm);  in loopback_trigger()
457 	struct loopback_pcm *dpcm = runtime->private_data;  in params_change()  local
458 	struct loopback_cable *cable = dpcm->cable;  in params_change()
477 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_prepare()  local
478 	struct loopback_cable *cable = dpcm->cable;  in loopback_prepare()
482 		err = cable->ops->stop_sync(dpcm);  in loopback_prepare()
493 	dpcm->buf_pos = 0;  in loopback_prepare()
494 	dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size);  in loopback_prepare()
497 		dpcm->silent_size = dpcm->pcm_buffer_size;  in loopback_prepare()
502 	dpcm->irq_pos = 0;  in loopback_prepare()
503 	dpcm->period_update_pending = 0;  in loopback_prepare()
504 	dpcm->pcm_bps = bps;  in loopback_prepare()
505 	dpcm->pcm_salign = salign;  in loopback_prepare()
506 	dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size);  in loopback_prepare()
508 	mutex_lock(&dpcm->loopback->cable_lock);  in loopback_prepare()
510             (get_setup(dpcm)->notify &&  in loopback_prepare()
514 	mutex_unlock(&dpcm->loopback->cable_lock);  in loopback_prepare()
519 static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes)  in clear_capture_buf()  argument
521 	struct snd_pcm_runtime *runtime = dpcm->substream->runtime;  in clear_capture_buf()
523 	unsigned int dst_off = dpcm->buf_pos;  in clear_capture_buf()
525 	if (dpcm->silent_size >= dpcm->pcm_buffer_size)  in clear_capture_buf()
527 	if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size)  in clear_capture_buf()
528 		bytes = dpcm->pcm_buffer_size - dpcm->silent_size;  in clear_capture_buf()
532 		if (dst_off + size > dpcm->pcm_buffer_size)  in clear_capture_buf()
533 			size = dpcm->pcm_buffer_size - dst_off;  in clear_capture_buf()
537 		dpcm->silent_size += size;  in clear_capture_buf()
594 static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm,  in bytepos_delta()  argument
600 	last_pos = byte_pos(dpcm, dpcm->irq_pos);  in bytepos_delta()
601 	dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps;  in bytepos_delta()
602 	delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos;  in bytepos_delta()
603 	if (delta >= dpcm->last_drift)  in bytepos_delta()
604 		delta -= dpcm->last_drift;  in bytepos_delta()
605 	dpcm->last_drift = 0;  in bytepos_delta()
606 	if (dpcm->irq_pos >= dpcm->period_size_frac) {  in bytepos_delta()
607 		dpcm->irq_pos %= dpcm->period_size_frac;  in bytepos_delta()
608 		dpcm->period_update_pending = 1;  in bytepos_delta()
613 static inline void bytepos_finish(struct loopback_pcm *dpcm,  in bytepos_finish()  argument
616 	dpcm->buf_pos += delta;  in bytepos_finish()
617 	dpcm->buf_pos %= dpcm->pcm_buffer_size;  in bytepos_finish()
678 	struct loopback_pcm *dpcm = from_timer(dpcm, t, timer);  in loopback_jiffies_timer_function()  local
681 	spin_lock_irqsave(&dpcm->cable->lock, flags);  in loopback_jiffies_timer_function()
682 	if (loopback_jiffies_timer_pos_update(dpcm->cable) &  in loopback_jiffies_timer_function()
683 			(1 << dpcm->substream->stream)) {  in loopback_jiffies_timer_function()
684 		loopback_jiffies_timer_start(dpcm);  in loopback_jiffies_timer_function()
685 		if (dpcm->period_update_pending) {  in loopback_jiffies_timer_function()
686 			dpcm->period_update_pending = 0;  in loopback_jiffies_timer_function()
687 			spin_unlock_irqrestore(&dpcm->cable->lock, flags);  in loopback_jiffies_timer_function()
689 			snd_pcm_period_elapsed(dpcm->substream);  in loopback_jiffies_timer_function()
693 	spin_unlock_irqrestore(&dpcm->cable->lock, flags);  in loopback_jiffies_timer_function()
701 		struct loopback_pcm *dpcm = runtime->private_data;  in loopback_snd_timer_check_resolution()  local
702 		struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_check_resolution()
718 		pcm_err(dpcm->substream->pcm,  in loopback_snd_timer_check_resolution()
857 static void loopback_jiffies_timer_dpcm_info(struct loopback_pcm *dpcm,  in loopback_jiffies_timer_dpcm_info()  argument
861 		    dpcm->period_update_pending);  in loopback_jiffies_timer_dpcm_info()
862 	snd_iprintf(buffer, "    irq_pos:\t\t%u\n", dpcm->irq_pos);  in loopback_jiffies_timer_dpcm_info()
863 	snd_iprintf(buffer, "    period_frac:\t%u\n", dpcm->period_size_frac);  in loopback_jiffies_timer_dpcm_info()
865 		    dpcm->last_jiffies, cycles_to_jiffies());  in loopback_jiffies_timer_dpcm_info()
866 	snd_iprintf(buffer, "    timer_expires:\t%lu\n", dpcm->timer.expires);  in loopback_jiffies_timer_dpcm_info()
869 static void loopback_snd_timer_dpcm_info(struct loopback_pcm *dpcm,  in loopback_snd_timer_dpcm_info()  argument
872 	struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_dpcm_info()
886 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_pointer()  local
889 	spin_lock(&dpcm->cable->lock);  in loopback_pointer()
890 	if (dpcm->cable->ops->pos_update)  in loopback_pointer()
891 		dpcm->cable->ops->pos_update(dpcm->cable);  in loopback_pointer()
892 	pos = dpcm->buf_pos;  in loopback_pointer()
893 	spin_unlock(&dpcm->cable->lock);  in loopback_pointer()
924 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_runtime_free()  local
925 	kfree(dpcm);  in loopback_runtime_free()
931 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_hw_free()  local
932 	struct loopback_cable *cable = dpcm->cable;  in loopback_hw_free()
934 	mutex_lock(&dpcm->loopback->cable_lock);  in loopback_hw_free()
936 	mutex_unlock(&dpcm->loopback->cable_lock);  in loopback_hw_free()
951 	struct loopback_pcm *dpcm = rule->private;  in rule_format()  local
952 	struct loopback_cable *cable = dpcm->cable;  in rule_format()
956 	mutex_lock(&dpcm->loopback->cable_lock);  in rule_format()
959 	mutex_unlock(&dpcm->loopback->cable_lock);  in rule_format()
966 	struct loopback_pcm *dpcm = rule->private;  in rule_rate()  local
967 	struct loopback_cable *cable = dpcm->cable;  in rule_rate()
970 	mutex_lock(&dpcm->loopback->cable_lock);  in rule_rate()
973 	mutex_unlock(&dpcm->loopback->cable_lock);  in rule_rate()
982 	struct loopback_pcm *dpcm = rule->private;  in rule_channels()  local
983 	struct loopback_cable *cable = dpcm->cable;  in rule_channels()
986 	mutex_lock(&dpcm->loopback->cable_lock);  in rule_channels()
989 	mutex_unlock(&dpcm->loopback->cable_lock);  in rule_channels()
998 	struct loopback_pcm *dpcm = rule->private;  in rule_period_bytes()  local
999 	struct loopback_cable *cable = dpcm->cable;  in rule_period_bytes()
1002 	mutex_lock(&dpcm->loopback->cable_lock);  in rule_period_bytes()
1005 	mutex_unlock(&dpcm->loopback->cable_lock);  in rule_period_bytes()
1027 		struct loopback_pcm *dpcm = substream->runtime->private_data;  in free_cable()  local
1029 		if (cable->ops && cable->ops->close_cable && dpcm)  in free_cable()
1030 			cable->ops->close_cable(dpcm);  in free_cable()
1037 static int loopback_jiffies_timer_open(struct loopback_pcm *dpcm)  in loopback_jiffies_timer_open()  argument
1039 	timer_setup(&dpcm->timer, loopback_jiffies_timer_function, 0);  in loopback_jiffies_timer_open()
1115 static int loopback_snd_timer_open(struct loopback_pcm *dpcm)  in loopback_snd_timer_open()  argument
1123 	struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_open()
1131 	err = loopback_parse_timer_id(dpcm->loopback->timer_source, &tid);  in loopback_snd_timer_open()
1133 		pcm_err(dpcm->substream->pcm,  in loopback_snd_timer_open()
1135 			dpcm->loopback->timer_source, err);  in loopback_snd_timer_open()
1139 	cable->snd_timer.stream = dpcm->substream->stream;  in loopback_snd_timer_open()
1142 	timeri = snd_timer_instance_new(dpcm->loopback->card->id);  in loopback_snd_timer_open()
1176 		pcm_err(dpcm->substream->pcm,  in loopback_snd_timer_open()
1207 	struct loopback_pcm *dpcm;  in loopback_open()  local
1213 	dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);  in loopback_open()
1214 	if (!dpcm) {  in loopback_open()
1218 	dpcm->loopback = loopback;  in loopback_open()
1219 	dpcm->substream = substream;  in loopback_open()
1236 	dpcm->cable = cable;  in loopback_open()
1237 	runtime->private_data = dpcm;  in loopback_open()
1240 		err = cable->ops->open(dpcm);  in loopback_open()
1252 				  rule_format, dpcm,  in loopback_open()
1258 				  rule_rate, dpcm,  in loopback_open()
1264 				  rule_channels, dpcm,  in loopback_open()
1276 					  rule_period_bytes, dpcm,  in loopback_open()
1282 	/* loopback_runtime_free() has not to be called if kfree(dpcm) was  in loopback_open()
1286 	if (get_notify(dpcm))  in loopback_open()
1292 	cable->streams[substream->stream] = dpcm;  in loopback_open()
1298 		kfree(dpcm);  in loopback_open()
1307 	struct loopback_pcm *dpcm = substream->runtime->private_data;  in loopback_close()  local
1310 	if (dpcm->cable->ops->close_substream)  in loopback_close()
1311 		err = dpcm->cable->ops->close_substream(dpcm);  in loopback_close()
1626 			    struct loopback_pcm *dpcm,  in print_dpcm_info()  argument
1630 	if (dpcm == NULL) {  in print_dpcm_info()
1634 	snd_iprintf(buffer, "    buffer_size:\t%u\n", dpcm->pcm_buffer_size);  in print_dpcm_info()
1635 	snd_iprintf(buffer, "    buffer_pos:\t\t%u\n", dpcm->buf_pos);  in print_dpcm_info()
1636 	snd_iprintf(buffer, "    silent_size:\t%u\n", dpcm->silent_size);  in print_dpcm_info()
1637 	snd_iprintf(buffer, "    period_size:\t%u\n", dpcm->pcm_period_size);  in print_dpcm_info()
1638 	snd_iprintf(buffer, "    bytes_per_sec:\t%u\n", dpcm->pcm_bps);  in print_dpcm_info()
1639 	snd_iprintf(buffer, "    sample_align:\t%u\n", dpcm->pcm_salign);  in print_dpcm_info()
1640 	snd_iprintf(buffer, "    rate_shift:\t\t%u\n", dpcm->pcm_rate_shift);  in print_dpcm_info()
1641 	if (dpcm->cable->ops->dpcm_info)  in print_dpcm_info()
1642 		dpcm->cable->ops->dpcm_info(dpcm, buffer);  in print_dpcm_info()