2 * motu-hwdep.c - a part of driver for MOTU FireWire series
4 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
6 * Licensed under the terms of the GNU General Public License, version 2.
10 * This codes have five functionalities.
12 * 1.get information about firewire node
13 * 2.get notification about starting/stopping stream
14 * 3.lock/unlock streaming
20 static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
23 struct snd_motu *motu = hwdep->private_data;
25 union snd_firewire_event event;
27 spin_lock_irq(&motu->lock);
29 while (!motu->dev_lock_changed && motu->msg == 0) {
30 prepare_to_wait(&motu->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
31 spin_unlock_irq(&motu->lock);
33 finish_wait(&motu->hwdep_wait, &wait);
34 if (signal_pending(current))
36 spin_lock_irq(&motu->lock);
39 memset(&event, 0, sizeof(event));
40 if (motu->dev_lock_changed) {
41 event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
42 event.lock_status.status = (motu->dev_lock_count > 0);
43 motu->dev_lock_changed = false;
45 count = min_t(long, count, sizeof(event.lock_status));
47 event.motu_notification.type = SNDRV_FIREWIRE_EVENT_MOTU_NOTIFICATION;
48 event.motu_notification.message = motu->msg;
51 count = min_t(long, count, sizeof(event.motu_notification));
54 spin_unlock_irq(&motu->lock);
56 if (copy_to_user(buf, &event, count))
62 static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
65 struct snd_motu *motu = hwdep->private_data;
68 poll_wait(file, &motu->hwdep_wait, wait);
70 spin_lock_irq(&motu->lock);
71 if (motu->dev_lock_changed || motu->msg)
72 events = EPOLLIN | EPOLLRDNORM;
75 spin_unlock_irq(&motu->lock);
77 return events | EPOLLOUT;
80 static int hwdep_get_info(struct snd_motu *motu, void __user *arg)
82 struct fw_device *dev = fw_parent_device(motu->unit);
83 struct snd_firewire_get_info info;
85 memset(&info, 0, sizeof(info));
86 info.type = SNDRV_FIREWIRE_TYPE_MOTU;
87 info.card = dev->card->index;
88 *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
89 *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
90 strlcpy(info.device_name, dev_name(&dev->device),
91 sizeof(info.device_name));
93 if (copy_to_user(arg, &info, sizeof(info)))
99 static int hwdep_lock(struct snd_motu *motu)
103 spin_lock_irq(&motu->lock);
105 if (motu->dev_lock_count == 0) {
106 motu->dev_lock_count = -1;
112 spin_unlock_irq(&motu->lock);
117 static int hwdep_unlock(struct snd_motu *motu)
121 spin_lock_irq(&motu->lock);
123 if (motu->dev_lock_count == -1) {
124 motu->dev_lock_count = 0;
130 spin_unlock_irq(&motu->lock);
135 static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
137 struct snd_motu *motu = hwdep->private_data;
139 spin_lock_irq(&motu->lock);
140 if (motu->dev_lock_count == -1)
141 motu->dev_lock_count = 0;
142 spin_unlock_irq(&motu->lock);
147 static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
148 unsigned int cmd, unsigned long arg)
150 struct snd_motu *motu = hwdep->private_data;
153 case SNDRV_FIREWIRE_IOCTL_GET_INFO:
154 return hwdep_get_info(motu, (void __user *)arg);
155 case SNDRV_FIREWIRE_IOCTL_LOCK:
156 return hwdep_lock(motu);
157 case SNDRV_FIREWIRE_IOCTL_UNLOCK:
158 return hwdep_unlock(motu);
165 static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
166 unsigned int cmd, unsigned long arg)
168 return hwdep_ioctl(hwdep, file, cmd,
169 (unsigned long)compat_ptr(arg));
172 #define hwdep_compat_ioctl NULL
175 int snd_motu_create_hwdep_device(struct snd_motu *motu)
177 static const struct snd_hwdep_ops ops = {
179 .release = hwdep_release,
181 .ioctl = hwdep_ioctl,
182 .ioctl_compat = hwdep_compat_ioctl,
184 struct snd_hwdep *hwdep;
187 err = snd_hwdep_new(motu->card, motu->card->driver, 0, &hwdep);
191 strcpy(hwdep->name, "MOTU");
192 hwdep->iface = SNDRV_HWDEP_IFACE_FW_MOTU;
194 hwdep->private_data = motu;
195 hwdep->exclusive = true;