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da607e19 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
19af57b4 TS |
2 | /* |
3 | * dice_hwdep.c - a part of driver for DICE based devices | |
4 | * | |
5 | * Copyright (c) Clemens Ladisch <clemens@ladisch.de> | |
6 | * Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp> | |
19af57b4 TS |
7 | */ |
8 | ||
9 | #include "dice.h" | |
10 | ||
11 | static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, | |
12 | long count, loff_t *offset) | |
13 | { | |
14 | struct snd_dice *dice = hwdep->private_data; | |
15 | DEFINE_WAIT(wait); | |
16 | union snd_firewire_event event; | |
17 | ||
18 | spin_lock_irq(&dice->lock); | |
19 | ||
20 | while (!dice->dev_lock_changed && dice->notification_bits == 0) { | |
21 | prepare_to_wait(&dice->hwdep_wait, &wait, TASK_INTERRUPTIBLE); | |
22 | spin_unlock_irq(&dice->lock); | |
23 | schedule(); | |
24 | finish_wait(&dice->hwdep_wait, &wait); | |
25 | if (signal_pending(current)) | |
26 | return -ERESTARTSYS; | |
27 | spin_lock_irq(&dice->lock); | |
28 | } | |
29 | ||
30 | memset(&event, 0, sizeof(event)); | |
31 | if (dice->dev_lock_changed) { | |
32 | event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS; | |
33 | event.lock_status.status = dice->dev_lock_count > 0; | |
34 | dice->dev_lock_changed = false; | |
35 | ||
36 | count = min_t(long, count, sizeof(event.lock_status)); | |
37 | } else { | |
38 | event.dice_notification.type = | |
39 | SNDRV_FIREWIRE_EVENT_DICE_NOTIFICATION; | |
40 | event.dice_notification.notification = dice->notification_bits; | |
41 | dice->notification_bits = 0; | |
42 | ||
43 | count = min_t(long, count, sizeof(event.dice_notification)); | |
44 | } | |
45 | ||
46 | spin_unlock_irq(&dice->lock); | |
47 | ||
48 | if (copy_to_user(buf, &event, count)) | |
49 | return -EFAULT; | |
50 | ||
51 | return count; | |
52 | } | |
53 | ||
680ef72a | 54 | static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file, |
19af57b4 TS |
55 | poll_table *wait) |
56 | { | |
57 | struct snd_dice *dice = hwdep->private_data; | |
680ef72a | 58 | __poll_t events; |
19af57b4 TS |
59 | |
60 | poll_wait(file, &dice->hwdep_wait, wait); | |
61 | ||
62 | spin_lock_irq(&dice->lock); | |
63 | if (dice->dev_lock_changed || dice->notification_bits != 0) | |
a9a08845 | 64 | events = EPOLLIN | EPOLLRDNORM; |
19af57b4 TS |
65 | else |
66 | events = 0; | |
67 | spin_unlock_irq(&dice->lock); | |
68 | ||
69 | return events; | |
70 | } | |
71 | ||
72 | static int hwdep_get_info(struct snd_dice *dice, void __user *arg) | |
73 | { | |
74 | struct fw_device *dev = fw_parent_device(dice->unit); | |
75 | struct snd_firewire_get_info info; | |
76 | ||
77 | memset(&info, 0, sizeof(info)); | |
78 | info.type = SNDRV_FIREWIRE_TYPE_DICE; | |
79 | info.card = dev->card->index; | |
80 | *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]); | |
81 | *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]); | |
82 | strlcpy(info.device_name, dev_name(&dev->device), | |
83 | sizeof(info.device_name)); | |
84 | ||
85 | if (copy_to_user(arg, &info, sizeof(info))) | |
86 | return -EFAULT; | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static int hwdep_lock(struct snd_dice *dice) | |
92 | { | |
93 | int err; | |
94 | ||
95 | spin_lock_irq(&dice->lock); | |
96 | ||
97 | if (dice->dev_lock_count == 0) { | |
98 | dice->dev_lock_count = -1; | |
99 | err = 0; | |
100 | } else { | |
101 | err = -EBUSY; | |
102 | } | |
103 | ||
104 | spin_unlock_irq(&dice->lock); | |
105 | ||
106 | return err; | |
107 | } | |
108 | ||
109 | static int hwdep_unlock(struct snd_dice *dice) | |
110 | { | |
111 | int err; | |
112 | ||
113 | spin_lock_irq(&dice->lock); | |
114 | ||
115 | if (dice->dev_lock_count == -1) { | |
116 | dice->dev_lock_count = 0; | |
117 | err = 0; | |
118 | } else { | |
119 | err = -EBADFD; | |
120 | } | |
121 | ||
122 | spin_unlock_irq(&dice->lock); | |
123 | ||
124 | return err; | |
125 | } | |
126 | ||
127 | static int hwdep_release(struct snd_hwdep *hwdep, struct file *file) | |
128 | { | |
129 | struct snd_dice *dice = hwdep->private_data; | |
130 | ||
131 | spin_lock_irq(&dice->lock); | |
132 | if (dice->dev_lock_count == -1) | |
133 | dice->dev_lock_count = 0; | |
134 | spin_unlock_irq(&dice->lock); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file, | |
140 | unsigned int cmd, unsigned long arg) | |
141 | { | |
142 | struct snd_dice *dice = hwdep->private_data; | |
143 | ||
144 | switch (cmd) { | |
145 | case SNDRV_FIREWIRE_IOCTL_GET_INFO: | |
146 | return hwdep_get_info(dice, (void __user *)arg); | |
147 | case SNDRV_FIREWIRE_IOCTL_LOCK: | |
148 | return hwdep_lock(dice); | |
149 | case SNDRV_FIREWIRE_IOCTL_UNLOCK: | |
150 | return hwdep_unlock(dice); | |
151 | default: | |
152 | return -ENOIOCTLCMD; | |
153 | } | |
154 | } | |
155 | ||
156 | #ifdef CONFIG_COMPAT | |
157 | static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file, | |
158 | unsigned int cmd, unsigned long arg) | |
159 | { | |
160 | return hwdep_ioctl(hwdep, file, cmd, | |
161 | (unsigned long)compat_ptr(arg)); | |
162 | } | |
163 | #else | |
164 | #define hwdep_compat_ioctl NULL | |
165 | #endif | |
166 | ||
167 | int snd_dice_create_hwdep(struct snd_dice *dice) | |
168 | { | |
169 | static const struct snd_hwdep_ops ops = { | |
170 | .read = hwdep_read, | |
171 | .release = hwdep_release, | |
172 | .poll = hwdep_poll, | |
173 | .ioctl = hwdep_ioctl, | |
174 | .ioctl_compat = hwdep_compat_ioctl, | |
175 | }; | |
176 | struct snd_hwdep *hwdep; | |
177 | int err; | |
178 | ||
179 | err = snd_hwdep_new(dice->card, "DICE", 0, &hwdep); | |
180 | if (err < 0) | |
181 | return err; | |
182 | strcpy(hwdep->name, "DICE"); | |
183 | hwdep->iface = SNDRV_HWDEP_IFACE_FW_DICE; | |
184 | hwdep->ops = ops; | |
185 | hwdep->private_data = dice; | |
186 | hwdep->exclusive = true; | |
187 | ||
188 | return 0; | |
189 | } |