18 static long tscm_hwdep_read_locked(struct snd_tscm *tscm, char __user *buf,  in tscm_hwdep_read_locked()  argument
25 	event.status = (tscm->dev_lock_count > 0);  in tscm_hwdep_read_locked()
26 	tscm->dev_lock_changed = false;  in tscm_hwdep_read_locked()
29 	spin_unlock_irq(&tscm->lock);  in tscm_hwdep_read_locked()
37 static long tscm_hwdep_read_queue(struct snd_tscm *tscm, char __user *buf,  in tscm_hwdep_read_queue()  argument
42 	struct snd_firewire_tascam_change *entries = tscm->queue;  in tscm_hwdep_read_queue()
47 		spin_unlock_irq(&tscm->lock);  in tscm_hwdep_read_queue()
61 		if (tscm->pull_pos == tscm->push_pos)  in tscm_hwdep_read_queue()
63 		else if (tscm->pull_pos < tscm->push_pos)  in tscm_hwdep_read_queue()
64 			tail_pos = tscm->push_pos;  in tscm_hwdep_read_queue()
67 		head_pos = tscm->pull_pos;  in tscm_hwdep_read_queue()
75 		spin_unlock_irq(&tscm->lock);  in tscm_hwdep_read_queue()
79 		spin_lock_irq(&tscm->lock);  in tscm_hwdep_read_queue()
81 		tscm->pull_pos = tail_pos % SND_TSCM_QUEUE_COUNT;  in tscm_hwdep_read_queue()
88 	spin_unlock_irq(&tscm->lock);  in tscm_hwdep_read_queue()
99 	struct snd_tscm *tscm = hwdep->private_data;  in hwdep_read()  local
102 	spin_lock_irq(&tscm->lock);  in hwdep_read()
104 	while (!tscm->dev_lock_changed && tscm->push_pos == tscm->pull_pos) {  in hwdep_read()
105 		prepare_to_wait(&tscm->hwdep_wait, &wait, TASK_INTERRUPTIBLE);  in hwdep_read()
106 		spin_unlock_irq(&tscm->lock);  in hwdep_read()
108 		finish_wait(&tscm->hwdep_wait, &wait);  in hwdep_read()
111 		spin_lock_irq(&tscm->lock);  in hwdep_read()
115 	if (tscm->dev_lock_changed) {  in hwdep_read()
116 		count = tscm_hwdep_read_locked(tscm, buf, count, offset);  in hwdep_read()
117 	} else if (tscm->push_pos != tscm->pull_pos) {  in hwdep_read()
118 		count = tscm_hwdep_read_queue(tscm, buf, count, offset);  in hwdep_read()
120 		spin_unlock_irq(&tscm->lock);  in hwdep_read()
130 	struct snd_tscm *tscm = hwdep->private_data;  in hwdep_poll()  local
133 	poll_wait(file, &tscm->hwdep_wait, wait);  in hwdep_poll()
135 	spin_lock_irq(&tscm->lock);  in hwdep_poll()
136 	if (tscm->dev_lock_changed || tscm->push_pos != tscm->pull_pos)  in hwdep_poll()
140 	spin_unlock_irq(&tscm->lock);  in hwdep_poll()
145 static int hwdep_get_info(struct snd_tscm *tscm, void __user *arg)  in hwdep_get_info()  argument
147 	struct fw_device *dev = fw_parent_device(tscm->unit);  in hwdep_get_info()
164 static int hwdep_lock(struct snd_tscm *tscm)  in hwdep_lock()  argument
168 	spin_lock_irq(&tscm->lock);  in hwdep_lock()
170 	if (tscm->dev_lock_count == 0) {  in hwdep_lock()
171 		tscm->dev_lock_count = -1;  in hwdep_lock()
177 	spin_unlock_irq(&tscm->lock);  in hwdep_lock()
182 static int hwdep_unlock(struct snd_tscm *tscm)  in hwdep_unlock()  argument
186 	spin_lock_irq(&tscm->lock);  in hwdep_unlock()
188 	if (tscm->dev_lock_count == -1) {  in hwdep_unlock()
189 		tscm->dev_lock_count = 0;  in hwdep_unlock()
195 	spin_unlock_irq(&tscm->lock);  in hwdep_unlock()
200 static int tscm_hwdep_state(struct snd_tscm *tscm, void __user *arg)  in tscm_hwdep_state()  argument
202 	if (copy_to_user(arg, tscm->state, sizeof(tscm->state)))  in tscm_hwdep_state()
210 	struct snd_tscm *tscm = hwdep->private_data;  in hwdep_release()  local
212 	spin_lock_irq(&tscm->lock);  in hwdep_release()
213 	if (tscm->dev_lock_count == -1)  in hwdep_release()
214 		tscm->dev_lock_count = 0;  in hwdep_release()
215 	spin_unlock_irq(&tscm->lock);  in hwdep_release()
223 	struct snd_tscm *tscm = hwdep->private_data;  in hwdep_ioctl()  local
227 		return hwdep_get_info(tscm, (void __user *)arg);  in hwdep_ioctl()
229 		return hwdep_lock(tscm);  in hwdep_ioctl()
231 		return hwdep_unlock(tscm);  in hwdep_ioctl()
233 		return tscm_hwdep_state(tscm, (void __user *)arg);  in hwdep_ioctl()
250 int snd_tscm_create_hwdep_device(struct snd_tscm *tscm)  in snd_tscm_create_hwdep_device()  argument
262 	err = snd_hwdep_new(tscm->card, "Tascam", 0, &hwdep);  in snd_tscm_create_hwdep_device()
269 	hwdep->private_data = tscm;  in snd_tscm_create_hwdep_device()
272 	tscm->hwdep = hwdep;  in snd_tscm_create_hwdep_device()