firewire/fireface/ff-hwdep.c

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