127 static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x)  in byte_pos()  argument
129 	if (dpcm->pcm_rate_shift == NO_PITCH) {  in byte_pos()
133 			    HZ * (unsigned long long)dpcm->pcm_rate_shift);  in byte_pos()
135 	return x - (x % dpcm->pcm_salign);  in byte_pos()
138 static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x)  in frac_pos()  argument
140 	if (dpcm->pcm_rate_shift == NO_PITCH) {	/* no pitch */  in frac_pos()
143 		x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ,  in frac_pos()
149 static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm)  in get_setup()  argument
151 	int device = dpcm->substream->pstr->pcm->device;  in get_setup()
153 	if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK)  in get_setup()
155 	return &dpcm->loopback->setup[dpcm->substream->number][device];  in get_setup()
158 static inline unsigned int get_notify(struct loopback_pcm *dpcm)  in get_notify()  argument
160 	return get_setup(dpcm)->notify;  in get_notify()
163 static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm)  in get_rate_shift()  argument
165 	return get_setup(dpcm)->rate_shift;  in get_rate_shift()
169 static void loopback_timer_start(struct loopback_pcm *dpcm)  in loopback_timer_start()  argument
172 	unsigned int rate_shift = get_rate_shift(dpcm);  in loopback_timer_start()
174 	if (rate_shift != dpcm->pcm_rate_shift) {  in loopback_timer_start()
175 		dpcm->pcm_rate_shift = rate_shift;  in loopback_timer_start()
176 		dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size);  in loopback_timer_start()
178 	if (dpcm->period_size_frac <= dpcm->irq_pos) {  in loopback_timer_start()
179 		dpcm->irq_pos %= dpcm->period_size_frac;  in loopback_timer_start()
180 		dpcm->period_update_pending = 1;  in loopback_timer_start()
182 	tick = dpcm->period_size_frac - dpcm->irq_pos;  in loopback_timer_start()
183 	tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps;  in loopback_timer_start()
184 	mod_timer(&dpcm->timer, jiffies + tick);  in loopback_timer_start()
188 static inline void loopback_timer_stop(struct loopback_pcm *dpcm)  in loopback_timer_stop()  argument
190 	del_timer(&dpcm->timer);  in loopback_timer_stop()
191 	dpcm->timer.expires = 0;  in loopback_timer_stop()
248 static void loopback_active_notify(struct loopback_pcm *dpcm)  in loopback_active_notify()  argument
250 	snd_ctl_notify(dpcm->loopback->card,  in loopback_active_notify()
252 		       &get_setup(dpcm)->active_id);  in loopback_active_notify()
258 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_trigger()  local
259 	struct loopback_cable *cable = dpcm->cable;  in loopback_trigger()
267 		dpcm->last_jiffies = jiffies;  in loopback_trigger()
268 		dpcm->pcm_rate_shift = 0;  in loopback_trigger()
269 		dpcm->last_drift = 0;  in loopback_trigger()
273 		loopback_timer_start(dpcm);  in loopback_trigger()
276 			loopback_active_notify(dpcm);  in loopback_trigger()
282 		loopback_timer_stop(dpcm);  in loopback_trigger()
285 			loopback_active_notify(dpcm);  in loopback_trigger()
291 		loopback_timer_stop(dpcm);  in loopback_trigger()
297 		dpcm->last_jiffies = jiffies;  in loopback_trigger()
299 		loopback_timer_start(dpcm);  in loopback_trigger()
308 static void params_change_substream(struct loopback_pcm *dpcm,  in params_change_substream()  argument
313 	if (dpcm == NULL || dpcm->substream == NULL)  in params_change_substream()
315 	dst_runtime = dpcm->substream->runtime;  in params_change_substream()
318 	dst_runtime->hw = dpcm->cable->hw;  in params_change_substream()
324 	struct loopback_pcm *dpcm = runtime->private_data;  in params_change()  local
325 	struct loopback_cable *cable = dpcm->cable;  in params_change()
341 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_prepare()  local
342 	struct loopback_cable *cable = dpcm->cable;  in loopback_prepare()
351 	dpcm->buf_pos = 0;  in loopback_prepare()
352 	dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size);  in loopback_prepare()
355 		dpcm->silent_size = dpcm->pcm_buffer_size;  in loopback_prepare()
360 	dpcm->irq_pos = 0;  in loopback_prepare()
361 	dpcm->period_update_pending = 0;  in loopback_prepare()
362 	dpcm->pcm_bps = bps;  in loopback_prepare()
363 	dpcm->pcm_salign = salign;  in loopback_prepare()
364 	dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size);  in loopback_prepare()
366 	mutex_lock(&dpcm->loopback->cable_lock);  in loopback_prepare()
368             (get_setup(dpcm)->notify &&  in loopback_prepare()
372 	mutex_unlock(&dpcm->loopback->cable_lock);  in loopback_prepare()
377 static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes)  in clear_capture_buf()  argument
379 	struct snd_pcm_runtime *runtime = dpcm->substream->runtime;  in clear_capture_buf()
381 	unsigned int dst_off = dpcm->buf_pos;  in clear_capture_buf()
383 	if (dpcm->silent_size >= dpcm->pcm_buffer_size)  in clear_capture_buf()
385 	if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size)  in clear_capture_buf()
386 		bytes = dpcm->pcm_buffer_size - dpcm->silent_size;  in clear_capture_buf()
390 		if (dst_off + size > dpcm->pcm_buffer_size)  in clear_capture_buf()
391 			size = dpcm->pcm_buffer_size - dst_off;  in clear_capture_buf()
395 		dpcm->silent_size += size;  in clear_capture_buf()
452 static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm,  in bytepos_delta()  argument
458 	last_pos = byte_pos(dpcm, dpcm->irq_pos);  in bytepos_delta()
459 	dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps;  in bytepos_delta()
460 	delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos;  in bytepos_delta()
461 	if (delta >= dpcm->last_drift)  in bytepos_delta()
462 		delta -= dpcm->last_drift;  in bytepos_delta()
463 	dpcm->last_drift = 0;  in bytepos_delta()
464 	if (dpcm->irq_pos >= dpcm->period_size_frac) {  in bytepos_delta()
465 		dpcm->irq_pos %= dpcm->period_size_frac;  in bytepos_delta()
466 		dpcm->period_update_pending = 1;  in bytepos_delta()
471 static inline void bytepos_finish(struct loopback_pcm *dpcm,  in bytepos_finish()  argument
474 	dpcm->buf_pos += delta;  in bytepos_finish()
475 	dpcm->buf_pos %= dpcm->pcm_buffer_size;  in bytepos_finish()
534 	struct loopback_pcm *dpcm = (struct loopback_pcm *)data;  in loopback_timer_function()  local
537 	spin_lock_irqsave(&dpcm->cable->lock, flags);  in loopback_timer_function()
538 	if (loopback_pos_update(dpcm->cable) & (1 << dpcm->substream->stream)) {  in loopback_timer_function()
539 		loopback_timer_start(dpcm);  in loopback_timer_function()
540 		if (dpcm->period_update_pending) {  in loopback_timer_function()
541 			dpcm->period_update_pending = 0;  in loopback_timer_function()
542 			spin_unlock_irqrestore(&dpcm->cable->lock, flags);  in loopback_timer_function()
544 			snd_pcm_period_elapsed(dpcm->substream);  in loopback_timer_function()
548 	spin_unlock_irqrestore(&dpcm->cable->lock, flags);  in loopback_timer_function()
554 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_pointer()  local
557 	spin_lock(&dpcm->cable->lock);  in loopback_pointer()
558 	loopback_pos_update(dpcm->cable);  in loopback_pointer()
559 	pos = dpcm->buf_pos;  in loopback_pointer()
560 	spin_unlock(&dpcm->cable->lock);  in loopback_pointer()
589 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_runtime_free()  local
590 	kfree(dpcm);  in loopback_runtime_free()
603 	struct loopback_pcm *dpcm = runtime->private_data;  in loopback_hw_free()  local
604 	struct loopback_cable *cable = dpcm->cable;  in loopback_hw_free()
606 	mutex_lock(&dpcm->loopback->cable_lock);  in loopback_hw_free()
608 	mutex_unlock(&dpcm->loopback->cable_lock);  in loopback_hw_free()
665 	struct loopback_pcm *dpcm;  in loopback_open()  local
671 	dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);  in loopback_open()
672 	if (!dpcm) {  in loopback_open()
676 	dpcm->loopback = loopback;  in loopback_open()
677 	dpcm->substream = substream;  in loopback_open()
678 	setup_timer(&dpcm->timer, loopback_timer_function,  in loopback_open()
679 		    (unsigned long)dpcm);  in loopback_open()
685 			kfree(dpcm);  in loopback_open()
693 	dpcm->cable = cable;  in loopback_open()
694 	cable->streams[substream->stream] = dpcm;  in loopback_open()
720 	runtime->private_data = dpcm;  in loopback_open()
722 	if (get_notify(dpcm))  in loopback_open()
734 	struct loopback_pcm *dpcm = substream->runtime->private_data;  in loopback_close()  local
738 	loopback_timer_stop(dpcm);  in loopback_close()
1057 			    struct loopback_pcm *dpcm,  in print_dpcm_info()  argument
1061 	if (dpcm == NULL) {  in print_dpcm_info()
1065 	snd_iprintf(buffer, "    buffer_size:\t%u\n", dpcm->pcm_buffer_size);  in print_dpcm_info()
1066 	snd_iprintf(buffer, "    buffer_pos:\t\t%u\n", dpcm->buf_pos);  in print_dpcm_info()
1067 	snd_iprintf(buffer, "    silent_size:\t%u\n", dpcm->silent_size);  in print_dpcm_info()
1068 	snd_iprintf(buffer, "    period_size:\t%u\n", dpcm->pcm_period_size);  in print_dpcm_info()
1069 	snd_iprintf(buffer, "    bytes_per_sec:\t%u\n", dpcm->pcm_bps);  in print_dpcm_info()
1070 	snd_iprintf(buffer, "    sample_align:\t%u\n", dpcm->pcm_salign);  in print_dpcm_info()
1071 	snd_iprintf(buffer, "    rate_shift:\t\t%u\n", dpcm->pcm_rate_shift);  in print_dpcm_info()
1073 						dpcm->period_update_pending);  in print_dpcm_info()
1074 	snd_iprintf(buffer, "    irq_pos:\t\t%u\n", dpcm->irq_pos);  in print_dpcm_info()
1075 	snd_iprintf(buffer, "    period_frac:\t%u\n", dpcm->period_size_frac);  in print_dpcm_info()
1077 					dpcm->last_jiffies, jiffies);  in print_dpcm_info()
1078 	snd_iprintf(buffer, "    timer_expires:\t%lu\n", dpcm->timer.expires);  in print_dpcm_info()