18 static bool has_msg(struct snd_ff *ff)  in has_msg()  argument
20 	if (ff->spec->protocol->has_msg)  in has_msg()
21 		return ff->spec->protocol->has_msg(ff);  in has_msg()
29 	struct snd_ff *ff = hwdep->private_data;  in hwdep_read()  local
32 	spin_lock_irq(&ff->lock);  in hwdep_read()
34 	while (!ff->dev_lock_changed && !has_msg(ff)) {  in hwdep_read()
35 		prepare_to_wait(&ff->hwdep_wait, &wait, TASK_INTERRUPTIBLE);  in hwdep_read()
36 		spin_unlock_irq(&ff->lock);  in hwdep_read()
38 		finish_wait(&ff->hwdep_wait, &wait);  in hwdep_read()
41 		spin_lock_irq(&ff->lock);  in hwdep_read()
44 	if (ff->dev_lock_changed && count >= sizeof(struct snd_firewire_event_lock_status)) {  in hwdep_read()
47 			.status = (ff->dev_lock_count > 0),  in hwdep_read()
50 		ff->dev_lock_changed = false;  in hwdep_read()
52 		spin_unlock_irq(&ff->lock);  in hwdep_read()
57 	} else if (has_msg(ff)) {  in hwdep_read()
60 		count = ff->spec->protocol->copy_msg_to_user(ff, buf, count);  in hwdep_read()
61 		spin_unlock_irq(&ff->lock);  in hwdep_read()
63 		spin_unlock_irq(&ff->lock);  in hwdep_read()
74 	struct snd_ff *ff = hwdep->private_data;  in hwdep_poll()  local
77 	poll_wait(file, &ff->hwdep_wait, wait);  in hwdep_poll()
79 	spin_lock_irq(&ff->lock);  in hwdep_poll()
80 	if (ff->dev_lock_changed || has_msg(ff))  in hwdep_poll()
84 	spin_unlock_irq(&ff->lock);  in hwdep_poll()
89 static int hwdep_get_info(struct snd_ff *ff, void __user *arg)  in hwdep_get_info()  argument
91 	struct fw_device *dev = fw_parent_device(ff->unit);  in hwdep_get_info()
108 static int hwdep_lock(struct snd_ff *ff)  in hwdep_lock()  argument
112 	spin_lock_irq(&ff->lock);  in hwdep_lock()
114 	if (ff->dev_lock_count == 0) {  in hwdep_lock()
115 		ff->dev_lock_count = -1;  in hwdep_lock()
121 	spin_unlock_irq(&ff->lock);  in hwdep_lock()
126 static int hwdep_unlock(struct snd_ff *ff)  in hwdep_unlock()  argument
130 	spin_lock_irq(&ff->lock);  in hwdep_unlock()
132 	if (ff->dev_lock_count == -1) {  in hwdep_unlock()
133 		ff->dev_lock_count = 0;  in hwdep_unlock()
139 	spin_unlock_irq(&ff->lock);  in hwdep_unlock()
146 	struct snd_ff *ff = hwdep->private_data;  in hwdep_release()  local
148 	spin_lock_irq(&ff->lock);  in hwdep_release()
149 	if (ff->dev_lock_count == -1)  in hwdep_release()
150 		ff->dev_lock_count = 0;  in hwdep_release()
151 	spin_unlock_irq(&ff->lock);  in hwdep_release()
159 	struct snd_ff *ff = hwdep->private_data;  in hwdep_ioctl()  local
163 		return hwdep_get_info(ff, (void __user *)arg);  in hwdep_ioctl()
165 		return hwdep_lock(ff);  in hwdep_ioctl()
167 		return hwdep_unlock(ff);  in hwdep_ioctl()
184 int snd_ff_create_hwdep_devices(struct snd_ff *ff)  in snd_ff_create_hwdep_devices()  argument
196 	err = snd_hwdep_new(ff->card, ff->card->driver, 0, &hwdep);  in snd_ff_create_hwdep_devices()
200 	strcpy(hwdep->name, ff->card->driver);  in snd_ff_create_hwdep_devices()
203 	hwdep->private_data = ff;  in snd_ff_create_hwdep_devices()