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16#include "ff.h"
17
18static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
19 loff_t *offset)
20{
21 struct snd_ff *ff = hwdep->private_data;
22 DEFINE_WAIT(wait);
23 union snd_firewire_event event;
24
25 spin_lock_irq(&ff->lock);
26
27 while (!ff->dev_lock_changed) {
28 prepare_to_wait(&ff->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
29 spin_unlock_irq(&ff->lock);
30 schedule();
31 finish_wait(&ff->hwdep_wait, &wait);
32 if (signal_pending(current))
33 return -ERESTARTSYS;
34 spin_lock_irq(&ff->lock);
35 }
36
37 memset(&event, 0, sizeof(event));
38 event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
39 event.lock_status.status = (ff->dev_lock_count > 0);
40 ff->dev_lock_changed = false;
41
42 count = min_t(long, count, sizeof(event.lock_status));
43
44 spin_unlock_irq(&ff->lock);
45
46 if (copy_to_user(buf, &event, count))
47 return -EFAULT;
48
49 return count;
50}
51
52static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
53 poll_table *wait)
54{
55 struct snd_ff *ff = hwdep->private_data;
56 __poll_t events;
57
58 poll_wait(file, &ff->hwdep_wait, wait);
59
60 spin_lock_irq(&ff->lock);
61 if (ff->dev_lock_changed)
62 events = EPOLLIN | EPOLLRDNORM;
63 else
64 events = 0;
65 spin_unlock_irq(&ff->lock);
66
67 return events;
68}
69
70static int hwdep_get_info(struct snd_ff *ff, void __user *arg)
71{
72 struct fw_device *dev = fw_parent_device(ff->unit);
73 struct snd_firewire_get_info info;
74
75 memset(&info, 0, sizeof(info));
76 info.type = SNDRV_FIREWIRE_TYPE_FIREFACE;
77 info.card = dev->card->index;
78 *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
79 *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
80 strscpy(info.device_name, dev_name(&dev->device),
81 sizeof(info.device_name));
82
83 if (copy_to_user(arg, &info, sizeof(info)))
84 return -EFAULT;
85
86 return 0;
87}
88
89static int hwdep_lock(struct snd_ff *ff)
90{
91 int err;
92
93 spin_lock_irq(&ff->lock);
94
95 if (ff->dev_lock_count == 0) {
96 ff->dev_lock_count = -1;
97 err = 0;
98 } else {
99 err = -EBUSY;
100 }
101
102 spin_unlock_irq(&ff->lock);
103
104 return err;
105}
106
107static int hwdep_unlock(struct snd_ff *ff)
108{
109 int err;
110
111 spin_lock_irq(&ff->lock);
112
113 if (ff->dev_lock_count == -1) {
114 ff->dev_lock_count = 0;
115 err = 0;
116 } else {
117 err = -EBADFD;
118 }
119
120 spin_unlock_irq(&ff->lock);
121
122 return err;
123}
124
125static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
126{
127 struct snd_ff *ff = hwdep->private_data;
128
129 spin_lock_irq(&ff->lock);
130 if (ff->dev_lock_count == -1)
131 ff->dev_lock_count = 0;
132 spin_unlock_irq(&ff->lock);
133
134 return 0;
135}
136
137static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
138 unsigned int cmd, unsigned long arg)
139{
140 struct snd_ff *ff = hwdep->private_data;
141
142 switch (cmd) {
143 case SNDRV_FIREWIRE_IOCTL_GET_INFO:
144 return hwdep_get_info(ff, (void __user *)arg);
145 case SNDRV_FIREWIRE_IOCTL_LOCK:
146 return hwdep_lock(ff);
147 case SNDRV_FIREWIRE_IOCTL_UNLOCK:
148 return hwdep_unlock(ff);
149 default:
150 return -ENOIOCTLCMD;
151 }
152}
153
154#ifdef CONFIG_COMPAT
155static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
156 unsigned int cmd, unsigned long arg)
157{
158 return hwdep_ioctl(hwdep, file, cmd,
159 (unsigned long)compat_ptr(arg));
160}
161#else
162#define hwdep_compat_ioctl NULL
163#endif
164
165int snd_ff_create_hwdep_devices(struct snd_ff *ff)
166{
167 static const struct snd_hwdep_ops hwdep_ops = {
168 .read = hwdep_read,
169 .release = hwdep_release,
170 .poll = hwdep_poll,
171 .ioctl = hwdep_ioctl,
172 .ioctl_compat = hwdep_compat_ioctl,
173 };
174 struct snd_hwdep *hwdep;
175 int err;
176
177 err = snd_hwdep_new(ff->card, ff->card->driver, 0, &hwdep);
178 if (err < 0)
179 return err;
180
181 strcpy(hwdep->name, ff->card->driver);
182 hwdep->iface = SNDRV_HWDEP_IFACE_FW_FIREFACE;
183 hwdep->ops = hwdep_ops;
184 hwdep->private_data = ff;
185 hwdep->exclusive = true;
186
187 return 0;
188}
189
