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192.168.1.100 / T800 / 0b39b87cb0cd96fd68f16a6d004c85c06a954fb2 / . / src / kernel / linux / v4.19 / sound / firewire / oxfw / oxfw-hwdep.c
blob: 50a1c03b42b9aa2bb6f86b820b58acb0fe74a8af [file] [log] [blame]
xjb04a4022021-11-25 15:01:52 +0800[diff] [blame]1/*
2 * oxfw_hwdep.c - a part of driver for OXFW970/971 based devices
3 *
4 * Copyright (c) 2014 Takashi Sakamoto
5 *
6 * Licensed under the terms of the GNU General Public License, version 2.
7 */
8
9/*
10 * This codes give three functionality.
11 *
12 * 1.get firewire node information
13 * 2.get notification about starting/stopping stream
14 * 3.lock/unlock stream
15 */
16
17#include "oxfw.h"
18
19static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
20 loff_t *offset)
21{
22 struct snd_oxfw *oxfw = hwdep->private_data;
23 DEFINE_WAIT(wait);
24 union snd_firewire_event event;
25
26 spin_lock_irq(&oxfw->lock);
27
28 while (!oxfw->dev_lock_changed) {
29 prepare_to_wait(&oxfw->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
30 spin_unlock_irq(&oxfw->lock);
31 schedule();
32 finish_wait(&oxfw->hwdep_wait, &wait);
33 if (signal_pending(current))
34 return -ERESTARTSYS;
35 spin_lock_irq(&oxfw->lock);
36 }
37
38 memset(&event, 0, sizeof(event));
39 if (oxfw->dev_lock_changed) {
40 event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
41 event.lock_status.status = (oxfw->dev_lock_count > 0);
42 oxfw->dev_lock_changed = false;
43
44 count = min_t(long, count, sizeof(event.lock_status));
45 }
46
47 spin_unlock_irq(&oxfw->lock);
48
49 if (copy_to_user(buf, &event, count))
50 return -EFAULT;
51
52 return count;
53}
54
55static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
56 poll_table *wait)
57{
58 struct snd_oxfw *oxfw = hwdep->private_data;
59 __poll_t events;
60
61 poll_wait(file, &oxfw->hwdep_wait, wait);
62
63 spin_lock_irq(&oxfw->lock);
64 if (oxfw->dev_lock_changed)
65 events = EPOLLIN | EPOLLRDNORM;
66 else
67 events = 0;
68 spin_unlock_irq(&oxfw->lock);
69
70 return events;
71}
72
73static int hwdep_get_info(struct snd_oxfw *oxfw, void __user *arg)
74{
75 struct fw_device *dev = fw_parent_device(oxfw->unit);
76 struct snd_firewire_get_info info;
77
78 memset(&info, 0, sizeof(info));
79 info.type = SNDRV_FIREWIRE_TYPE_OXFW;
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));
85
86 if (copy_to_user(arg, &info, sizeof(info)))
87 return -EFAULT;
88
89 return 0;
90}
91
92static int hwdep_lock(struct snd_oxfw *oxfw)
93{
94 int err;
95
96 spin_lock_irq(&oxfw->lock);
97
98 if (oxfw->dev_lock_count == 0) {
99 oxfw->dev_lock_count = -1;
100 err = 0;
101 } else {
102 err = -EBUSY;
103 }
104
105 spin_unlock_irq(&oxfw->lock);
106
107 return err;
108}
109
110static int hwdep_unlock(struct snd_oxfw *oxfw)
111{
112 int err;
113
114 spin_lock_irq(&oxfw->lock);
115
116 if (oxfw->dev_lock_count == -1) {
117 oxfw->dev_lock_count = 0;
118 err = 0;
119 } else {
120 err = -EBADFD;
121 }
122
123 spin_unlock_irq(&oxfw->lock);
124
125 return err;
126}
127
128static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
129{
130 struct snd_oxfw *oxfw = hwdep->private_data;
131
132 spin_lock_irq(&oxfw->lock);
133 if (oxfw->dev_lock_count == -1)
134 oxfw->dev_lock_count = 0;
135 spin_unlock_irq(&oxfw->lock);
136
137 return 0;
138}
139
140static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
141 unsigned int cmd, unsigned long arg)
142{
143 struct snd_oxfw *oxfw = hwdep->private_data;
144
145 switch (cmd) {
146 case SNDRV_FIREWIRE_IOCTL_GET_INFO:
147 return hwdep_get_info(oxfw, (void __user *)arg);
148 case SNDRV_FIREWIRE_IOCTL_LOCK:
149 return hwdep_lock(oxfw);
150 case SNDRV_FIREWIRE_IOCTL_UNLOCK:
151 return hwdep_unlock(oxfw);
152 default:
153 return -ENOIOCTLCMD;
154 }
155}
156
157#ifdef CONFIG_COMPAT
158static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
159 unsigned int cmd, unsigned long arg)
160{
161 return hwdep_ioctl(hwdep, file, cmd,
162 (unsigned long)compat_ptr(arg));
163}
164#else
165#define hwdep_compat_ioctl NULL
166#endif
167
168int snd_oxfw_create_hwdep(struct snd_oxfw *oxfw)
169{
170 static const struct snd_hwdep_ops hwdep_ops = {
171 .read = hwdep_read,
172 .release = hwdep_release,
173 .poll = hwdep_poll,
174 .ioctl = hwdep_ioctl,
175 .ioctl_compat = hwdep_compat_ioctl,
176 };
177 struct snd_hwdep *hwdep;
178 int err;
179
180 err = snd_hwdep_new(oxfw->card, oxfw->card->driver, 0, &hwdep);
181 if (err < 0)
182 goto end;
183 strcpy(hwdep->name, oxfw->card->driver);
184 hwdep->iface = SNDRV_HWDEP_IFACE_FW_OXFW;
185 hwdep->ops = hwdep_ops;
186 hwdep->private_data = oxfw;
187 hwdep->exclusive = true;
188end:
189 return err;
190}