Commit | Line | Data |
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660dd3d5 TS |
1 | /* |
2 | * digi00x-hwdep.c - a part of driver for Digidesign Digi 002/003 family | |
3 | * | |
4 | * Copyright (c) 2014-2015 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 | |
44b73088 | 15 | * 4.get asynchronous messaging |
660dd3d5 TS |
16 | */ |
17 | ||
18 | #include "digi00x.h" | |
19 | ||
20 | static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count, | |
21 | loff_t *offset) | |
22 | { | |
23 | struct snd_dg00x *dg00x = hwdep->private_data; | |
24 | DEFINE_WAIT(wait); | |
25 | union snd_firewire_event event; | |
26 | ||
27 | spin_lock_irq(&dg00x->lock); | |
28 | ||
44b73088 | 29 | while (!dg00x->dev_lock_changed && dg00x->msg == 0) { |
660dd3d5 TS |
30 | prepare_to_wait(&dg00x->hwdep_wait, &wait, TASK_INTERRUPTIBLE); |
31 | spin_unlock_irq(&dg00x->lock); | |
32 | schedule(); | |
33 | finish_wait(&dg00x->hwdep_wait, &wait); | |
34 | if (signal_pending(current)) | |
35 | return -ERESTARTSYS; | |
36 | spin_lock_irq(&dg00x->lock); | |
37 | } | |
38 | ||
39 | memset(&event, 0, sizeof(event)); | |
40 | if (dg00x->dev_lock_changed) { | |
41 | event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS; | |
42 | event.lock_status.status = (dg00x->dev_lock_count > 0); | |
43 | dg00x->dev_lock_changed = false; | |
44 | ||
45 | count = min_t(long, count, sizeof(event.lock_status)); | |
44b73088 TS |
46 | } else { |
47 | event.digi00x_message.type = | |
48 | SNDRV_FIREWIRE_EVENT_DIGI00X_MESSAGE; | |
49 | event.digi00x_message.message = dg00x->msg; | |
50 | dg00x->msg = 0; | |
51 | ||
52 | count = min_t(long, count, sizeof(event.digi00x_message)); | |
660dd3d5 TS |
53 | } |
54 | ||
55 | spin_unlock_irq(&dg00x->lock); | |
56 | ||
57 | if (copy_to_user(buf, &event, count)) | |
58 | return -EFAULT; | |
59 | ||
60 | return count; | |
61 | } | |
62 | ||
680ef72a | 63 | static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file, |
660dd3d5 TS |
64 | poll_table *wait) |
65 | { | |
66 | struct snd_dg00x *dg00x = hwdep->private_data; | |
680ef72a | 67 | __poll_t events; |
660dd3d5 TS |
68 | |
69 | poll_wait(file, &dg00x->hwdep_wait, wait); | |
70 | ||
71 | spin_lock_irq(&dg00x->lock); | |
44b73088 | 72 | if (dg00x->dev_lock_changed || dg00x->msg) |
a9a08845 | 73 | events = EPOLLIN | EPOLLRDNORM; |
660dd3d5 TS |
74 | else |
75 | events = 0; | |
76 | spin_unlock_irq(&dg00x->lock); | |
77 | ||
78 | return events; | |
79 | } | |
80 | ||
81 | static int hwdep_get_info(struct snd_dg00x *dg00x, void __user *arg) | |
82 | { | |
83 | struct fw_device *dev = fw_parent_device(dg00x->unit); | |
84 | struct snd_firewire_get_info info; | |
85 | ||
86 | memset(&info, 0, sizeof(info)); | |
87 | info.type = SNDRV_FIREWIRE_TYPE_DIGI00X; | |
88 | info.card = dev->card->index; | |
89 | *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]); | |
90 | *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]); | |
91 | strlcpy(info.device_name, dev_name(&dev->device), | |
92 | sizeof(info.device_name)); | |
93 | ||
94 | if (copy_to_user(arg, &info, sizeof(info))) | |
95 | return -EFAULT; | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static int hwdep_lock(struct snd_dg00x *dg00x) | |
101 | { | |
102 | int err; | |
103 | ||
104 | spin_lock_irq(&dg00x->lock); | |
105 | ||
106 | if (dg00x->dev_lock_count == 0) { | |
107 | dg00x->dev_lock_count = -1; | |
108 | err = 0; | |
109 | } else { | |
110 | err = -EBUSY; | |
111 | } | |
112 | ||
113 | spin_unlock_irq(&dg00x->lock); | |
114 | ||
115 | return err; | |
116 | } | |
117 | ||
118 | static int hwdep_unlock(struct snd_dg00x *dg00x) | |
119 | { | |
120 | int err; | |
121 | ||
122 | spin_lock_irq(&dg00x->lock); | |
123 | ||
124 | if (dg00x->dev_lock_count == -1) { | |
125 | dg00x->dev_lock_count = 0; | |
126 | err = 0; | |
127 | } else { | |
128 | err = -EBADFD; | |
129 | } | |
130 | ||
131 | spin_unlock_irq(&dg00x->lock); | |
132 | ||
133 | return err; | |
134 | } | |
135 | ||
136 | static int hwdep_release(struct snd_hwdep *hwdep, struct file *file) | |
137 | { | |
138 | struct snd_dg00x *dg00x = hwdep->private_data; | |
139 | ||
140 | spin_lock_irq(&dg00x->lock); | |
141 | if (dg00x->dev_lock_count == -1) | |
142 | dg00x->dev_lock_count = 0; | |
143 | spin_unlock_irq(&dg00x->lock); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file, | |
149 | unsigned int cmd, unsigned long arg) | |
150 | { | |
151 | struct snd_dg00x *dg00x = hwdep->private_data; | |
152 | ||
153 | switch (cmd) { | |
154 | case SNDRV_FIREWIRE_IOCTL_GET_INFO: | |
155 | return hwdep_get_info(dg00x, (void __user *)arg); | |
156 | case SNDRV_FIREWIRE_IOCTL_LOCK: | |
157 | return hwdep_lock(dg00x); | |
158 | case SNDRV_FIREWIRE_IOCTL_UNLOCK: | |
159 | return hwdep_unlock(dg00x); | |
160 | default: | |
161 | return -ENOIOCTLCMD; | |
162 | } | |
163 | } | |
164 | ||
165 | #ifdef CONFIG_COMPAT | |
166 | static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file, | |
167 | unsigned int cmd, unsigned long arg) | |
168 | { | |
169 | return hwdep_ioctl(hwdep, file, cmd, | |
170 | (unsigned long)compat_ptr(arg)); | |
171 | } | |
172 | #else | |
173 | #define hwdep_compat_ioctl NULL | |
174 | #endif | |
175 | ||
660dd3d5 TS |
176 | int snd_dg00x_create_hwdep_device(struct snd_dg00x *dg00x) |
177 | { | |
a4e86cba TS |
178 | static const struct snd_hwdep_ops ops = { |
179 | .read = hwdep_read, | |
180 | .release = hwdep_release, | |
181 | .poll = hwdep_poll, | |
182 | .ioctl = hwdep_ioctl, | |
183 | .ioctl_compat = hwdep_compat_ioctl, | |
184 | }; | |
660dd3d5 TS |
185 | struct snd_hwdep *hwdep; |
186 | int err; | |
187 | ||
188 | err = snd_hwdep_new(dg00x->card, "Digi00x", 0, &hwdep); | |
189 | if (err < 0) | |
190 | return err; | |
191 | ||
192 | strcpy(hwdep->name, "Digi00x"); | |
193 | hwdep->iface = SNDRV_HWDEP_IFACE_FW_DIGI00X; | |
a4e86cba | 194 | hwdep->ops = ops; |
660dd3d5 TS |
195 | hwdep->private_data = dg00x; |
196 | hwdep->exclusive = true; | |
197 | ||
198 | return err; | |
199 | } |