2 * digi00x-hwdep.c - a part of driver for Digidesign Digi 002/003 family
4 * Copyright (c) 2014-2015 Takashi Sakamoto
6 * Licensed under the terms of the GNU General Public License, version 2.
10 * This codes give three functionality.
12 * 1.get firewire node information
13 * 2.get notification about starting/stopping stream
14 * 3.lock/unlock stream
19 static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
22 struct snd_dg00x *dg00x = hwdep->private_data;
24 union snd_firewire_event event;
26 spin_lock_irq(&dg00x->lock);
28 while (!dg00x->dev_lock_changed) {
29 prepare_to_wait(&dg00x->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
30 spin_unlock_irq(&dg00x->lock);
32 finish_wait(&dg00x->hwdep_wait, &wait);
33 if (signal_pending(current))
35 spin_lock_irq(&dg00x->lock);
38 memset(&event, 0, sizeof(event));
39 if (dg00x->dev_lock_changed) {
40 event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
41 event.lock_status.status = (dg00x->dev_lock_count > 0);
42 dg00x->dev_lock_changed = false;
44 count = min_t(long, count, sizeof(event.lock_status));
47 spin_unlock_irq(&dg00x->lock);
49 if (copy_to_user(buf, &event, count))
55 static unsigned int hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
58 struct snd_dg00x *dg00x = hwdep->private_data;
61 poll_wait(file, &dg00x->hwdep_wait, wait);
63 spin_lock_irq(&dg00x->lock);
64 if (dg00x->dev_lock_changed)
65 events = POLLIN | POLLRDNORM;
68 spin_unlock_irq(&dg00x->lock);
73 static int hwdep_get_info(struct snd_dg00x *dg00x, void __user *arg)
75 struct fw_device *dev = fw_parent_device(dg00x->unit);
76 struct snd_firewire_get_info info;
78 memset(&info, 0, sizeof(info));
79 info.type = SNDRV_FIREWIRE_TYPE_DIGI00X;
80 info.card = dev->card->index;
81 *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
82 *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
83 strlcpy(info.device_name, dev_name(&dev->device),
84 sizeof(info.device_name));
86 if (copy_to_user(arg, &info, sizeof(info)))
92 static int hwdep_lock(struct snd_dg00x *dg00x)
96 spin_lock_irq(&dg00x->lock);
98 if (dg00x->dev_lock_count == 0) {
99 dg00x->dev_lock_count = -1;
105 spin_unlock_irq(&dg00x->lock);
110 static int hwdep_unlock(struct snd_dg00x *dg00x)
114 spin_lock_irq(&dg00x->lock);
116 if (dg00x->dev_lock_count == -1) {
117 dg00x->dev_lock_count = 0;
123 spin_unlock_irq(&dg00x->lock);
128 static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
130 struct snd_dg00x *dg00x = hwdep->private_data;
132 spin_lock_irq(&dg00x->lock);
133 if (dg00x->dev_lock_count == -1)
134 dg00x->dev_lock_count = 0;
135 spin_unlock_irq(&dg00x->lock);
140 static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
141 unsigned int cmd, unsigned long arg)
143 struct snd_dg00x *dg00x = hwdep->private_data;
146 case SNDRV_FIREWIRE_IOCTL_GET_INFO:
147 return hwdep_get_info(dg00x, (void __user *)arg);
148 case SNDRV_FIREWIRE_IOCTL_LOCK:
149 return hwdep_lock(dg00x);
150 case SNDRV_FIREWIRE_IOCTL_UNLOCK:
151 return hwdep_unlock(dg00x);
158 static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
159 unsigned int cmd, unsigned long arg)
161 return hwdep_ioctl(hwdep, file, cmd,
162 (unsigned long)compat_ptr(arg));
165 #define hwdep_compat_ioctl NULL
168 static const struct snd_hwdep_ops hwdep_ops = {
170 .release = hwdep_release,
172 .ioctl = hwdep_ioctl,
173 .ioctl_compat = hwdep_compat_ioctl,
176 int snd_dg00x_create_hwdep_device(struct snd_dg00x *dg00x)
178 struct snd_hwdep *hwdep;
181 err = snd_hwdep_new(dg00x->card, "Digi00x", 0, &hwdep);
185 strcpy(hwdep->name, "Digi00x");
186 hwdep->iface = SNDRV_HWDEP_IFACE_FW_DIGI00X;
187 hwdep->ops = hwdep_ops;
188 hwdep->private_data = dg00x;
189 hwdep->exclusive = true;