Commit | Line | Data |
---|---|---|
618eabea TS |
1 | /* |
2 | * bebob_hwdep.c - a part of driver for BeBoB based devices | |
3 | * | |
4 | * Copyright (c) 2013-2014 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 infomation | |
13 | * 2.get notification about starting/stopping stream | |
14 | * 3.lock/unlock stream | |
15 | */ | |
16 | ||
17 | #include "bebob.h" | |
18 | ||
19 | static long | |
20 | hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count, | |
21 | loff_t *offset) | |
22 | { | |
23 | struct snd_bebob *bebob = hwdep->private_data; | |
24 | DEFINE_WAIT(wait); | |
25 | union snd_firewire_event event; | |
26 | ||
27 | spin_lock_irq(&bebob->lock); | |
28 | ||
29 | while (!bebob->dev_lock_changed) { | |
30 | prepare_to_wait(&bebob->hwdep_wait, &wait, TASK_INTERRUPTIBLE); | |
31 | spin_unlock_irq(&bebob->lock); | |
32 | schedule(); | |
33 | finish_wait(&bebob->hwdep_wait, &wait); | |
34 | if (signal_pending(current)) | |
35 | return -ERESTARTSYS; | |
36 | spin_lock_irq(&bebob->lock); | |
37 | } | |
38 | ||
39 | memset(&event, 0, sizeof(event)); | |
40 | if (bebob->dev_lock_changed) { | |
41 | event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS; | |
42 | event.lock_status.status = (bebob->dev_lock_count > 0); | |
43 | bebob->dev_lock_changed = false; | |
44 | ||
45 | count = min_t(long, count, sizeof(event.lock_status)); | |
46 | } | |
47 | ||
48 | spin_unlock_irq(&bebob->lock); | |
49 | ||
50 | if (copy_to_user(buf, &event, count)) | |
51 | return -EFAULT; | |
52 | ||
53 | return count; | |
54 | } | |
55 | ||
56 | static unsigned int | |
57 | hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait) | |
58 | { | |
59 | struct snd_bebob *bebob = hwdep->private_data; | |
60 | unsigned int events; | |
61 | ||
62 | poll_wait(file, &bebob->hwdep_wait, wait); | |
63 | ||
64 | spin_lock_irq(&bebob->lock); | |
65 | if (bebob->dev_lock_changed) | |
66 | events = POLLIN | POLLRDNORM; | |
67 | else | |
68 | events = 0; | |
69 | spin_unlock_irq(&bebob->lock); | |
70 | ||
71 | return events; | |
72 | } | |
73 | ||
74 | static int | |
75 | hwdep_get_info(struct snd_bebob *bebob, void __user *arg) | |
76 | { | |
77 | struct fw_device *dev = fw_parent_device(bebob->unit); | |
78 | struct snd_firewire_get_info info; | |
79 | ||
80 | memset(&info, 0, sizeof(info)); | |
81 | info.type = SNDRV_FIREWIRE_TYPE_BEBOB; | |
82 | info.card = dev->card->index; | |
83 | *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]); | |
84 | *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]); | |
85 | strlcpy(info.device_name, dev_name(&dev->device), | |
86 | sizeof(info.device_name)); | |
87 | ||
88 | if (copy_to_user(arg, &info, sizeof(info))) | |
89 | return -EFAULT; | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | static int | |
95 | hwdep_lock(struct snd_bebob *bebob) | |
96 | { | |
97 | int err; | |
98 | ||
99 | spin_lock_irq(&bebob->lock); | |
100 | ||
101 | if (bebob->dev_lock_count == 0) { | |
102 | bebob->dev_lock_count = -1; | |
103 | err = 0; | |
104 | } else { | |
105 | err = -EBUSY; | |
106 | } | |
107 | ||
108 | spin_unlock_irq(&bebob->lock); | |
109 | ||
110 | return err; | |
111 | } | |
112 | ||
113 | static int | |
114 | hwdep_unlock(struct snd_bebob *bebob) | |
115 | { | |
116 | int err; | |
117 | ||
118 | spin_lock_irq(&bebob->lock); | |
119 | ||
120 | if (bebob->dev_lock_count == -1) { | |
121 | bebob->dev_lock_count = 0; | |
122 | err = 0; | |
123 | } else { | |
124 | err = -EBADFD; | |
125 | } | |
126 | ||
127 | spin_unlock_irq(&bebob->lock); | |
128 | ||
129 | return err; | |
130 | } | |
131 | ||
132 | static int | |
133 | hwdep_release(struct snd_hwdep *hwdep, struct file *file) | |
134 | { | |
135 | struct snd_bebob *bebob = hwdep->private_data; | |
136 | ||
137 | spin_lock_irq(&bebob->lock); | |
138 | if (bebob->dev_lock_count == -1) | |
139 | bebob->dev_lock_count = 0; | |
140 | spin_unlock_irq(&bebob->lock); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static int | |
146 | hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file, | |
147 | unsigned int cmd, unsigned long arg) | |
148 | { | |
149 | struct snd_bebob *bebob = hwdep->private_data; | |
150 | ||
151 | switch (cmd) { | |
152 | case SNDRV_FIREWIRE_IOCTL_GET_INFO: | |
153 | return hwdep_get_info(bebob, (void __user *)arg); | |
154 | case SNDRV_FIREWIRE_IOCTL_LOCK: | |
155 | return hwdep_lock(bebob); | |
156 | case SNDRV_FIREWIRE_IOCTL_UNLOCK: | |
157 | return hwdep_unlock(bebob); | |
158 | default: | |
159 | return -ENOIOCTLCMD; | |
160 | } | |
161 | } | |
162 | ||
163 | #ifdef CONFIG_COMPAT | |
164 | static int | |
165 | 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 | ||
175 | static const struct snd_hwdep_ops hwdep_ops = { | |
176 | .read = hwdep_read, | |
177 | .release = hwdep_release, | |
178 | .poll = hwdep_poll, | |
179 | .ioctl = hwdep_ioctl, | |
180 | .ioctl_compat = hwdep_compat_ioctl, | |
181 | }; | |
182 | ||
183 | int snd_bebob_create_hwdep_device(struct snd_bebob *bebob) | |
184 | { | |
185 | struct snd_hwdep *hwdep; | |
186 | int err; | |
187 | ||
188 | err = snd_hwdep_new(bebob->card, "BeBoB", 0, &hwdep); | |
189 | if (err < 0) | |
190 | goto end; | |
191 | strcpy(hwdep->name, "BeBoB"); | |
192 | hwdep->iface = SNDRV_HWDEP_IFACE_FW_BEBOB; | |
193 | hwdep->ops = hwdep_ops; | |
194 | hwdep->private_data = bebob; | |
195 | hwdep->exclusive = true; | |
196 | end: | |
197 | return err; | |
198 | } | |
199 |