1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * digi00x-hwdep.c - a part of driver for Digidesign Digi 002/003 family
4 *
5 * Copyright (c) 2014-2015 Takashi Sakamoto
6 */
7
8 /*
9 * This codes give three functionality.
10 *
11 * 1.get firewire node information
12 * 2.get notification about starting/stopping stream
13 * 3.lock/unlock stream
14 * 4.get asynchronous messaging
15 */
16
17 #include "digi00x.h"
18
hwdep_read(struct snd_hwdep * hwdep,char __user * buf,long count,loff_t * offset)19 static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
20 loff_t *offset)
21 {
22 struct snd_dg00x *dg00x = hwdep->private_data;
23 DEFINE_WAIT(wait);
24 union snd_firewire_event event;
25
26 spin_lock_irq(&dg00x->lock);
27
28 while (!dg00x->dev_lock_changed && dg00x->msg == 0) {
29 prepare_to_wait(&dg00x->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
30 spin_unlock_irq(&dg00x->lock);
31 schedule();
32 finish_wait(&dg00x->hwdep_wait, &wait);
33 if (signal_pending(current))
34 return -ERESTARTSYS;
35 spin_lock_irq(&dg00x->lock);
36 }
37
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;
43
44 count = min_t(long, count, sizeof(event.lock_status));
45 } else {
46 event.digi00x_message.type =
47 SNDRV_FIREWIRE_EVENT_DIGI00X_MESSAGE;
48 event.digi00x_message.message = dg00x->msg;
49 dg00x->msg = 0;
50
51 count = min_t(long, count, sizeof(event.digi00x_message));
52 }
53
54 spin_unlock_irq(&dg00x->lock);
55
56 if (copy_to_user(buf, &event, count))
57 return -EFAULT;
58
59 return count;
60 }
61
hwdep_poll(struct snd_hwdep * hwdep,struct file * file,poll_table * wait)62 static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
63 poll_table *wait)
64 {
65 struct snd_dg00x *dg00x = hwdep->private_data;
66 __poll_t events;
67
68 poll_wait(file, &dg00x->hwdep_wait, wait);
69
70 spin_lock_irq(&dg00x->lock);
71 if (dg00x->dev_lock_changed || dg00x->msg)
72 events = EPOLLIN | EPOLLRDNORM;
73 else
74 events = 0;
75 spin_unlock_irq(&dg00x->lock);
76
77 return events;
78 }
79
hwdep_get_info(struct snd_dg00x * dg00x,void __user * arg)80 static int hwdep_get_info(struct snd_dg00x *dg00x, void __user *arg)
81 {
82 struct fw_device *dev = fw_parent_device(dg00x->unit);
83 struct snd_firewire_get_info info;
84
85 memset(&info, 0, sizeof(info));
86 info.type = SNDRV_FIREWIRE_TYPE_DIGI00X;
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));
92
93 if (copy_to_user(arg, &info, sizeof(info)))
94 return -EFAULT;
95
96 return 0;
97 }
98
hwdep_lock(struct snd_dg00x * dg00x)99 static int hwdep_lock(struct snd_dg00x *dg00x)
100 {
101 int err;
102
103 spin_lock_irq(&dg00x->lock);
104
105 if (dg00x->dev_lock_count == 0) {
106 dg00x->dev_lock_count = -1;
107 err = 0;
108 } else {
109 err = -EBUSY;
110 }
111
112 spin_unlock_irq(&dg00x->lock);
113
114 return err;
115 }
116
hwdep_unlock(struct snd_dg00x * dg00x)117 static int hwdep_unlock(struct snd_dg00x *dg00x)
118 {
119 int err;
120
121 spin_lock_irq(&dg00x->lock);
122
123 if (dg00x->dev_lock_count == -1) {
124 dg00x->dev_lock_count = 0;
125 err = 0;
126 } else {
127 err = -EBADFD;
128 }
129
130 spin_unlock_irq(&dg00x->lock);
131
132 return err;
133 }
134
hwdep_release(struct snd_hwdep * hwdep,struct file * file)135 static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
136 {
137 struct snd_dg00x *dg00x = hwdep->private_data;
138
139 spin_lock_irq(&dg00x->lock);
140 if (dg00x->dev_lock_count == -1)
141 dg00x->dev_lock_count = 0;
142 spin_unlock_irq(&dg00x->lock);
143
144 return 0;
145 }
146
hwdep_ioctl(struct snd_hwdep * hwdep,struct file * file,unsigned int cmd,unsigned long arg)147 static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
148 unsigned int cmd, unsigned long arg)
149 {
150 struct snd_dg00x *dg00x = hwdep->private_data;
151
152 switch (cmd) {
153 case SNDRV_FIREWIRE_IOCTL_GET_INFO:
154 return hwdep_get_info(dg00x, (void __user *)arg);
155 case SNDRV_FIREWIRE_IOCTL_LOCK:
156 return hwdep_lock(dg00x);
157 case SNDRV_FIREWIRE_IOCTL_UNLOCK:
158 return hwdep_unlock(dg00x);
159 default:
160 return -ENOIOCTLCMD;
161 }
162 }
163
164 #ifdef CONFIG_COMPAT
hwdep_compat_ioctl(struct snd_hwdep * hwdep,struct file * file,unsigned int cmd,unsigned long arg)165 static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
166 unsigned int cmd, unsigned long arg)
167 {
168 return hwdep_ioctl(hwdep, file, cmd,
169 (unsigned long)compat_ptr(arg));
170 }
171 #else
172 #define hwdep_compat_ioctl NULL
173 #endif
174
snd_dg00x_create_hwdep_device(struct snd_dg00x * dg00x)175 int snd_dg00x_create_hwdep_device(struct snd_dg00x *dg00x)
176 {
177 static const struct snd_hwdep_ops ops = {
178 .read = hwdep_read,
179 .release = hwdep_release,
180 .poll = hwdep_poll,
181 .ioctl = hwdep_ioctl,
182 .ioctl_compat = hwdep_compat_ioctl,
183 };
184 struct snd_hwdep *hwdep;
185 int err;
186
187 err = snd_hwdep_new(dg00x->card, "Digi00x", 0, &hwdep);
188 if (err < 0)
189 return err;
190
191 strcpy(hwdep->name, "Digi00x");
192 hwdep->iface = SNDRV_HWDEP_IFACE_FW_DIGI00X;
193 hwdep->ops = ops;
194 hwdep->private_data = dg00x;
195 hwdep->exclusive = true;
196
197 return err;
198 }
199
