Commit | Line | Data |
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e5e0c3dd TS |
1 | /* |
2 | * tascam-hwdep.c - a part of driver for TASCAM FireWire series | |
3 | * | |
4 | * Copyright (c) 2015 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 "tascam.h" | |
18 | ||
e5e0c3dd TS |
19 | static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count, |
20 | loff_t *offset) | |
21 | { | |
22 | struct snd_tscm *tscm = hwdep->private_data; | |
23 | DEFINE_WAIT(wait); | |
04b2d9c9 TS |
24 | union snd_firewire_event event = { |
25 | .lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS, | |
26 | }; | |
e5e0c3dd TS |
27 | |
28 | spin_lock_irq(&tscm->lock); | |
29 | ||
30 | while (!tscm->dev_lock_changed) { | |
31 | prepare_to_wait(&tscm->hwdep_wait, &wait, TASK_INTERRUPTIBLE); | |
32 | spin_unlock_irq(&tscm->lock); | |
33 | schedule(); | |
34 | finish_wait(&tscm->hwdep_wait, &wait); | |
35 | if (signal_pending(current)) | |
36 | return -ERESTARTSYS; | |
37 | spin_lock_irq(&tscm->lock); | |
38 | } | |
39 | ||
04b2d9c9 TS |
40 | event.lock_status.status = (tscm->dev_lock_count > 0); |
41 | tscm->dev_lock_changed = false; | |
42 | ||
e5e0c3dd TS |
43 | spin_unlock_irq(&tscm->lock); |
44 | ||
04b2d9c9 TS |
45 | count = min_t(long, count, sizeof(event.lock_status)); |
46 | ||
47 | if (copy_to_user(buf, &event, count)) | |
48 | return -EFAULT; | |
49 | ||
e5e0c3dd TS |
50 | return count; |
51 | } | |
52 | ||
53 | static unsigned int hwdep_poll(struct snd_hwdep *hwdep, struct file *file, | |
54 | poll_table *wait) | |
55 | { | |
56 | struct snd_tscm *tscm = hwdep->private_data; | |
57 | unsigned int events; | |
58 | ||
59 | poll_wait(file, &tscm->hwdep_wait, wait); | |
60 | ||
61 | spin_lock_irq(&tscm->lock); | |
62 | if (tscm->dev_lock_changed) | |
63 | events = POLLIN | POLLRDNORM; | |
64 | else | |
65 | events = 0; | |
66 | spin_unlock_irq(&tscm->lock); | |
67 | ||
68 | return events; | |
69 | } | |
70 | ||
71 | static int hwdep_get_info(struct snd_tscm *tscm, void __user *arg) | |
72 | { | |
73 | struct fw_device *dev = fw_parent_device(tscm->unit); | |
74 | struct snd_firewire_get_info info; | |
75 | ||
76 | memset(&info, 0, sizeof(info)); | |
77 | info.type = SNDRV_FIREWIRE_TYPE_TASCAM; | |
78 | info.card = dev->card->index; | |
79 | *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]); | |
80 | *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]); | |
81 | strlcpy(info.device_name, dev_name(&dev->device), | |
82 | sizeof(info.device_name)); | |
83 | ||
84 | if (copy_to_user(arg, &info, sizeof(info))) | |
85 | return -EFAULT; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | static int hwdep_lock(struct snd_tscm *tscm) | |
91 | { | |
92 | int err; | |
93 | ||
94 | spin_lock_irq(&tscm->lock); | |
95 | ||
96 | if (tscm->dev_lock_count == 0) { | |
97 | tscm->dev_lock_count = -1; | |
98 | err = 0; | |
99 | } else { | |
100 | err = -EBUSY; | |
101 | } | |
102 | ||
103 | spin_unlock_irq(&tscm->lock); | |
104 | ||
105 | return err; | |
106 | } | |
107 | ||
108 | static int hwdep_unlock(struct snd_tscm *tscm) | |
109 | { | |
110 | int err; | |
111 | ||
112 | spin_lock_irq(&tscm->lock); | |
113 | ||
114 | if (tscm->dev_lock_count == -1) { | |
115 | tscm->dev_lock_count = 0; | |
116 | err = 0; | |
117 | } else { | |
118 | err = -EBADFD; | |
119 | } | |
120 | ||
121 | spin_unlock_irq(&tscm->lock); | |
122 | ||
123 | return err; | |
124 | } | |
125 | ||
126 | static int hwdep_release(struct snd_hwdep *hwdep, struct file *file) | |
127 | { | |
128 | struct snd_tscm *tscm = hwdep->private_data; | |
129 | ||
130 | spin_lock_irq(&tscm->lock); | |
131 | if (tscm->dev_lock_count == -1) | |
132 | tscm->dev_lock_count = 0; | |
133 | spin_unlock_irq(&tscm->lock); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file, | |
139 | unsigned int cmd, unsigned long arg) | |
140 | { | |
141 | struct snd_tscm *tscm = hwdep->private_data; | |
142 | ||
143 | switch (cmd) { | |
144 | case SNDRV_FIREWIRE_IOCTL_GET_INFO: | |
145 | return hwdep_get_info(tscm, (void __user *)arg); | |
146 | case SNDRV_FIREWIRE_IOCTL_LOCK: | |
147 | return hwdep_lock(tscm); | |
148 | case SNDRV_FIREWIRE_IOCTL_UNLOCK: | |
149 | return hwdep_unlock(tscm); | |
150 | default: | |
151 | return -ENOIOCTLCMD; | |
152 | } | |
153 | } | |
154 | ||
155 | #ifdef CONFIG_COMPAT | |
156 | static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file, | |
157 | unsigned int cmd, unsigned long arg) | |
158 | { | |
159 | return hwdep_ioctl(hwdep, file, cmd, | |
160 | (unsigned long)compat_ptr(arg)); | |
161 | } | |
162 | #else | |
163 | #define hwdep_compat_ioctl NULL | |
164 | #endif | |
165 | ||
166 | static const struct snd_hwdep_ops hwdep_ops = { | |
167 | .read = hwdep_read, | |
168 | .release = hwdep_release, | |
169 | .poll = hwdep_poll, | |
170 | .ioctl = hwdep_ioctl, | |
171 | .ioctl_compat = hwdep_compat_ioctl, | |
172 | }; | |
173 | ||
174 | int snd_tscm_create_hwdep_device(struct snd_tscm *tscm) | |
175 | { | |
176 | struct snd_hwdep *hwdep; | |
177 | int err; | |
178 | ||
179 | err = snd_hwdep_new(tscm->card, "Tascam", 0, &hwdep); | |
180 | if (err < 0) | |
181 | return err; | |
182 | ||
183 | strcpy(hwdep->name, "Tascam"); | |
184 | hwdep->iface = SNDRV_HWDEP_IFACE_FW_TASCAM; | |
185 | hwdep->ops = hwdep_ops; | |
186 | hwdep->private_data = tscm; | |
187 | hwdep->exclusive = true; | |
188 | ||
189 | return err; | |
190 | } |