72 	int (*open)(struct loopback_pcm *dpcm);
76 	int (*start)(struct loopback_pcm *dpcm);
80 	int (*stop)(struct loopback_pcm *dpcm);
82 	int (*stop_sync)(struct loopback_pcm *dpcm);
84 	int (*close_substream)(struct loopback_pcm *dpcm);
88 	int (*close_cable)(struct loopback_pcm *dpcm);
94 	void (*dpcm_info)(struct loopback_pcm *dpcm,
170 static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x)  in byte_pos()  argument
172 	if (dpcm->pcm_rate_shift == NO_PITCH) {  in byte_pos()
176 			    HZ * (unsigned long long)dpcm->pcm_rate_shift);  in byte_pos()
178 	return x - (x % dpcm->pcm_salign);  in byte_pos()
181 static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x)  in frac_pos()  argument
183 	if (dpcm->pcm_rate_shift == NO_PITCH) {	/* no pitch */  in frac_pos()
186 		x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ,  in frac_pos()
192 static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm)  in get_setup()  argument
194 	int device = dpcm->substream->pstr->pcm->device;  in get_setup()
196 	if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK)  in get_setup()
198 	return &dpcm->loopback->setup[dpcm->substream->number][device];  in get_setup()
201 static inline unsigned int get_notify(struct loopback_pcm *dpcm)  in get_notify()  argument
203 	return get_setup(dpcm)->notify;  in get_notify()
206 static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm)  in get_rate_shift()  argument
208 	return get_setup(dpcm)->rate_shift;  in get_rate_shift()
212 static int loopback_jiffies_timer_start(struct loopback_pcm *dpcm)  in loopback_jiffies_timer_start()  argument
215 	unsigned int rate_shift = get_rate_shift(dpcm);  in loopback_jiffies_timer_start()
217 	if (rate_shift != dpcm->pcm_rate_shift) {  in loopback_jiffies_timer_start()
218 		dpcm->pcm_rate_shift = rate_shift;  in loopback_jiffies_timer_start()
219 		dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size);  in loopback_jiffies_timer_start()
221 	if (dpcm->period_size_frac <= dpcm->irq_pos) {  in loopback_jiffies_timer_start()
222 		dpcm->irq_pos %= dpcm->period_size_frac;  in loopback_jiffies_timer_start()
223 		dpcm->period_update_pending = 1;  in loopback_jiffies_timer_start()
225 	tick = dpcm->period_size_frac - dpcm->irq_pos;  in loopback_jiffies_timer_start()
226 	tick = DIV_ROUND_UP(tick, dpcm->pcm_bps);  in loopback_jiffies_timer_start()
227 	mod_timer(&dpcm->timer, jiffies + tick);  in loopback_jiffies_timer_start()
233 static int loopback_snd_timer_start(struct loopback_pcm *dpcm)  in loopback_snd_timer_start()  argument
235 	struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_start()
250 		pcm_err(dpcm->substream->pcm,  in loopback_snd_timer_start()
262 static inline int loopback_jiffies_timer_stop(struct loopback_pcm *dpcm)  in loopback_jiffies_timer_stop()  argument
264 	del_timer(&dpcm->timer);  in loopback_jiffies_timer_stop()
265 	dpcm->timer.expires = 0;  in loopback_jiffies_timer_stop()
271 static int loopback_snd_timer_stop(struct loopback_pcm *dpcm)  in loopback_snd_timer_stop()  argument
273 	struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_stop()
282 		pcm_err(dpcm->substream->pcm,  in loopback_snd_timer_stop()
293 static inline int loopback_jiffies_timer_stop_sync(struct loopback_pcm *dpcm)  in loopback_jiffies_timer_stop_sync()  argument
295 	del_timer_sync(&dpcm->timer);  in loopback_jiffies_timer_stop_sync()
301 static int loopback_snd_timer_close_cable(struct loopback_pcm *dpcm)  in loopback_snd_timer_close_cable()  argument
303 	struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_close_cable()
394 static void loopback_active_notify(struct loopback_pcm *dpcm)  in loopback_active_notify()  argument
396 	snd_ctl_notify(dpcm->loopback->card,  in loopback_active_notify()
398 		       &get_setup(dpcm)->active_id);  in loopback_active_notify()
404 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_trigger()  local
405 	struct loopback_cable *cable = dpcm->cable;  in loopback_trigger()
413 		dpcm->last_jiffies = jiffies;  in loopback_trigger()
414 		dpcm->pcm_rate_shift = 0;  in loopback_trigger()
415 		dpcm->last_drift = 0;  in loopback_trigger()
419 		err = cable->ops->start(dpcm);  in loopback_trigger()
422 			loopback_active_notify(dpcm);  in loopback_trigger()
428 		err = cable->ops->stop(dpcm);  in loopback_trigger()
431 			loopback_active_notify(dpcm);  in loopback_trigger()
437 		err = cable->ops->stop(dpcm);  in loopback_trigger()
440 			loopback_active_notify(dpcm);  in loopback_trigger()
445 		dpcm->last_jiffies = jiffies;  in loopback_trigger()
447 		err = cable->ops->start(dpcm);  in loopback_trigger()
450 			loopback_active_notify(dpcm);  in loopback_trigger()
461 	struct loopback_pcm *dpcm = runtime->private_data;  in params_change()  local
462 	struct loopback_cable *cable = dpcm->cable;  in params_change()
481 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_prepare()  local
482 	struct loopback_cable *cable = dpcm->cable;  in loopback_prepare()
486 		err = cable->ops->stop_sync(dpcm);  in loopback_prepare()
497 	dpcm->buf_pos = 0;  in loopback_prepare()
498 	dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size);  in loopback_prepare()
499 	dpcm->channel_buf_n = dpcm->pcm_buffer_size / runtime->channels;  in loopback_prepare()
502 		dpcm->silent_size = dpcm->pcm_buffer_size;  in loopback_prepare()
507 	dpcm->irq_pos = 0;  in loopback_prepare()
508 	dpcm->period_update_pending = 0;  in loopback_prepare()
509 	dpcm->pcm_bps = bps;  in loopback_prepare()
510 	dpcm->pcm_salign = salign;  in loopback_prepare()
511 	dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size);  in loopback_prepare()
513 	mutex_lock(&dpcm->loopback->cable_lock);  in loopback_prepare()
515             (get_setup(dpcm)->notify &&  in loopback_prepare()
519 	mutex_unlock(&dpcm->loopback->cable_lock);  in loopback_prepare()
524 static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes)  in clear_capture_buf()  argument
526 	struct snd_pcm_runtime *runtime = dpcm->substream->runtime;  in clear_capture_buf()
528 	unsigned int dst_off = dpcm->buf_pos;  in clear_capture_buf()
530 	if (dpcm->silent_size >= dpcm->pcm_buffer_size)  in clear_capture_buf()
532 	if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size)  in clear_capture_buf()
533 		bytes = dpcm->pcm_buffer_size - dpcm->silent_size;  in clear_capture_buf()
537 		if (dst_off + size > dpcm->pcm_buffer_size)  in clear_capture_buf()
538 			size = dpcm->pcm_buffer_size - dst_off;  in clear_capture_buf()
542 		dpcm->silent_size += size;  in clear_capture_buf()
618 static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm,  in bytepos_delta()  argument
624 	last_pos = byte_pos(dpcm, dpcm->irq_pos);  in bytepos_delta()
625 	dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps;  in bytepos_delta()
626 	delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos;  in bytepos_delta()
627 	if (delta >= dpcm->last_drift)  in bytepos_delta()
628 		delta -= dpcm->last_drift;  in bytepos_delta()
629 	dpcm->last_drift = 0;  in bytepos_delta()
630 	if (dpcm->irq_pos >= dpcm->period_size_frac) {  in bytepos_delta()
631 		dpcm->irq_pos %= dpcm->period_size_frac;  in bytepos_delta()
632 		dpcm->period_update_pending = 1;  in bytepos_delta()
637 static inline void bytepos_finish(struct loopback_pcm *dpcm,  in bytepos_finish()  argument
640 	dpcm->buf_pos += delta;  in bytepos_finish()
641 	dpcm->buf_pos %= dpcm->pcm_buffer_size;  in bytepos_finish()
702 	struct loopback_pcm *dpcm = from_timer(dpcm, t, timer);  in loopback_jiffies_timer_function()  local
705 	spin_lock_irqsave(&dpcm->cable->lock, flags);  in loopback_jiffies_timer_function()
706 	if (loopback_jiffies_timer_pos_update(dpcm->cable) &  in loopback_jiffies_timer_function()
707 			(1 << dpcm->substream->stream)) {  in loopback_jiffies_timer_function()
708 		loopback_jiffies_timer_start(dpcm);  in loopback_jiffies_timer_function()
709 		if (dpcm->period_update_pending) {  in loopback_jiffies_timer_function()
710 			dpcm->period_update_pending = 0;  in loopback_jiffies_timer_function()
711 			spin_unlock_irqrestore(&dpcm->cable->lock, flags);  in loopback_jiffies_timer_function()
713 			snd_pcm_period_elapsed(dpcm->substream);  in loopback_jiffies_timer_function()
717 	spin_unlock_irqrestore(&dpcm->cable->lock, flags);  in loopback_jiffies_timer_function()
725 		struct loopback_pcm *dpcm = runtime->private_data;  in loopback_snd_timer_check_resolution()  local
726 		struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_check_resolution()
742 		pcm_err(dpcm->substream->pcm,  in loopback_snd_timer_check_resolution()
881 static void loopback_jiffies_timer_dpcm_info(struct loopback_pcm *dpcm,  in loopback_jiffies_timer_dpcm_info()  argument
885 		    dpcm->period_update_pending);  in loopback_jiffies_timer_dpcm_info()
886 	snd_iprintf(buffer, "    irq_pos:\t\t%u\n", dpcm->irq_pos);  in loopback_jiffies_timer_dpcm_info()
887 	snd_iprintf(buffer, "    period_frac:\t%u\n", dpcm->period_size_frac);  in loopback_jiffies_timer_dpcm_info()
889 		    dpcm->last_jiffies, jiffies);  in loopback_jiffies_timer_dpcm_info()
890 	snd_iprintf(buffer, "    timer_expires:\t%lu\n", dpcm->timer.expires);  in loopback_jiffies_timer_dpcm_info()
893 static void loopback_snd_timer_dpcm_info(struct loopback_pcm *dpcm,  in loopback_snd_timer_dpcm_info()  argument
896 	struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_dpcm_info()
909 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_pointer()  local
912 	spin_lock(&dpcm->cable->lock);  in loopback_pointer()
913 	if (dpcm->cable->ops->pos_update)  in loopback_pointer()
914 		dpcm->cable->ops->pos_update(dpcm->cable);  in loopback_pointer()
915 	pos = dpcm->buf_pos;  in loopback_pointer()
916 	spin_unlock(&dpcm->cable->lock);  in loopback_pointer()
950 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_runtime_free()  local
951 	kfree(dpcm);  in loopback_runtime_free()
957 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_hw_free()  local
958 	struct loopback_cable *cable = dpcm->cable;  in loopback_hw_free()
960 	mutex_lock(&dpcm->loopback->cable_lock);  in loopback_hw_free()
962 	mutex_unlock(&dpcm->loopback->cable_lock);  in loopback_hw_free()
977 	struct loopback_pcm *dpcm = rule->private;  in rule_format()  local
978 	struct loopback_cable *cable = dpcm->cable;  in rule_format()
982 	mutex_lock(&dpcm->loopback->cable_lock);  in rule_format()
985 	mutex_unlock(&dpcm->loopback->cable_lock);  in rule_format()
992 	struct loopback_pcm *dpcm = rule->private;  in rule_rate()  local
993 	struct loopback_cable *cable = dpcm->cable;  in rule_rate()
996 	mutex_lock(&dpcm->loopback->cable_lock);  in rule_rate()
999 	mutex_unlock(&dpcm->loopback->cable_lock);  in rule_rate()
1008 	struct loopback_pcm *dpcm = rule->private;  in rule_channels()  local
1009 	struct loopback_cable *cable = dpcm->cable;  in rule_channels()
1012 	mutex_lock(&dpcm->loopback->cable_lock);  in rule_channels()
1015 	mutex_unlock(&dpcm->loopback->cable_lock);  in rule_channels()
1024 	struct loopback_pcm *dpcm = rule->private;  in rule_period_bytes()  local
1025 	struct loopback_cable *cable = dpcm->cable;  in rule_period_bytes()
1028 	mutex_lock(&dpcm->loopback->cable_lock);  in rule_period_bytes()
1031 	mutex_unlock(&dpcm->loopback->cable_lock);  in rule_period_bytes()
1053 		struct loopback_pcm *dpcm = substream->runtime->private_data;  in free_cable()  local
1055 		if (cable->ops && cable->ops->close_cable && dpcm)  in free_cable()
1056 			cable->ops->close_cable(dpcm);  in free_cable()
1063 static int loopback_jiffies_timer_open(struct loopback_pcm *dpcm)  in loopback_jiffies_timer_open()  argument
1065 	timer_setup(&dpcm->timer, loopback_jiffies_timer_function, 0);  in loopback_jiffies_timer_open()
1143 static int loopback_snd_timer_open(struct loopback_pcm *dpcm)  in loopback_snd_timer_open()  argument
1151 	struct loopback_cable *cable = dpcm->cable;  in loopback_snd_timer_open()
1159 	err = loopback_parse_timer_id(dpcm->loopback->timer_source, &tid);  in loopback_snd_timer_open()
1161 		pcm_err(dpcm->substream->pcm,  in loopback_snd_timer_open()
1163 			dpcm->loopback->timer_source, err);  in loopback_snd_timer_open()
1167 	cable->snd_timer.stream = dpcm->substream->stream;  in loopback_snd_timer_open()
1170 	timeri = snd_timer_instance_new(dpcm->loopback->card->id);  in loopback_snd_timer_open()
1204 		pcm_err(dpcm->substream->pcm,  in loopback_snd_timer_open()
1235 	struct loopback_pcm *dpcm;  in loopback_open()  local
1241 	dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);  in loopback_open()
1242 	if (!dpcm) {  in loopback_open()
1246 	dpcm->loopback = loopback;  in loopback_open()
1247 	dpcm->substream = substream;  in loopback_open()
1264 	dpcm->cable = cable;  in loopback_open()
1265 	runtime->private_data = dpcm;  in loopback_open()
1268 		err = cable->ops->open(dpcm);  in loopback_open()
1280 				  rule_format, dpcm,  in loopback_open()
1286 				  rule_rate, dpcm,  in loopback_open()
1292 				  rule_channels, dpcm,  in loopback_open()
1304 					  rule_period_bytes, dpcm,  in loopback_open()
1310 	/* loopback_runtime_free() has not to be called if kfree(dpcm) was  in loopback_open()
1314 	if (get_notify(dpcm))  in loopback_open()
1320 	cable->streams[substream->stream] = dpcm;  in loopback_open()
1326 		kfree(dpcm);  in loopback_open()
1335 	struct loopback_pcm *dpcm = substream->runtime->private_data;  in loopback_close()  local
1338 	if (dpcm->cable->ops->close_substream)  in loopback_close()
1339 		err = dpcm->cable->ops->close_substream(dpcm);  in loopback_close()
1689 			    struct loopback_pcm *dpcm,  in print_dpcm_info()  argument
1693 	if (dpcm == NULL) {  in print_dpcm_info()
1697 	snd_iprintf(buffer, "    buffer_size:\t%u\n", dpcm->pcm_buffer_size);  in print_dpcm_info()
1698 	snd_iprintf(buffer, "    buffer_pos:\t\t%u\n", dpcm->buf_pos);  in print_dpcm_info()
1699 	snd_iprintf(buffer, "    silent_size:\t%u\n", dpcm->silent_size);  in print_dpcm_info()
1700 	snd_iprintf(buffer, "    period_size:\t%u\n", dpcm->pcm_period_size);  in print_dpcm_info()
1701 	snd_iprintf(buffer, "    bytes_per_sec:\t%u\n", dpcm->pcm_bps);  in print_dpcm_info()
1702 	snd_iprintf(buffer, "    sample_align:\t%u\n", dpcm->pcm_salign);  in print_dpcm_info()
1703 	snd_iprintf(buffer, "    rate_shift:\t\t%u\n", dpcm->pcm_rate_shift);  in print_dpcm_info()
1704 	if (dpcm->cable->ops->dpcm_info)  in print_dpcm_info()
1705 		dpcm->cable->ops->dpcm_info(dpcm, buffer);  in print_dpcm_info()