Commit | Line | Data |
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c6e3fd22 WH |
1 | #include <linux/errno.h> |
2 | #include <linux/miscdevice.h> /* for misc_register, and SYNTH_MINOR */ | |
3 | #include <linux/types.h> | |
4 | #include <linux/uaccess.h> | |
5 | ||
6 | #include "speakup.h" | |
7 | #include "spk_priv.h" | |
8 | ||
9 | #ifndef SYNTH_MINOR | |
10 | #define SYNTH_MINOR 25 | |
11 | #endif | |
12 | ||
13 | static int misc_registered; | |
14 | static int dev_opened; | |
15 | ||
7c10f1cd EG |
16 | static ssize_t speakup_file_write(struct file *fp, const char __user *buffer, |
17 | size_t nbytes, loff_t *ppos) | |
c6e3fd22 WH |
18 | { |
19 | size_t count = nbytes; | |
7c10f1cd | 20 | const char __user *ptr = buffer; |
09f9390d | 21 | size_t bytes; |
c6e3fd22 WH |
22 | unsigned long flags; |
23 | u_char buf[256]; | |
09f9390d | 24 | |
562c4798 | 25 | if (!synth) |
c6e3fd22 WH |
26 | return -ENODEV; |
27 | while (count > 0) { | |
09f9390d | 28 | bytes = min(count, sizeof(buf)); |
c6e3fd22 WH |
29 | if (copy_from_user(buf, ptr, bytes)) |
30 | return -EFAULT; | |
31 | count -= bytes; | |
32 | ptr += bytes; | |
2da11ba6 | 33 | spin_lock_irqsave(&speakup_info.spinlock, flags); |
c6e3fd22 | 34 | synth_write(buf, bytes); |
2da11ba6 | 35 | spin_unlock_irqrestore(&speakup_info.spinlock, flags); |
c6e3fd22 | 36 | } |
b6ed5a23 | 37 | return (ssize_t)nbytes; |
c6e3fd22 WH |
38 | } |
39 | ||
7c10f1cd EG |
40 | static ssize_t speakup_file_read(struct file *fp, char __user *buf, |
41 | size_t nbytes, loff_t *ppos) | |
c6e3fd22 WH |
42 | { |
43 | return 0; | |
44 | } | |
45 | ||
46 | static int speakup_file_open(struct inode *ip, struct file *fp) | |
47 | { | |
562c4798 | 48 | if (!synth) |
c6e3fd22 WH |
49 | return -ENODEV; |
50 | if (xchg(&dev_opened, 1)) | |
51 | return -EBUSY; | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static int speakup_file_release(struct inode *ip, struct file *fp) | |
56 | { | |
57 | dev_opened = 0; | |
58 | return 0; | |
59 | } | |
60 | ||
a1823f2e | 61 | static const struct file_operations synth_fops = { |
c6e3fd22 WH |
62 | .read = speakup_file_read, |
63 | .write = speakup_file_write, | |
64 | .open = speakup_file_open, | |
65 | .release = speakup_file_release, | |
66 | }; | |
67 | ||
68 | static struct miscdevice synth_device = { | |
69 | .minor = SYNTH_MINOR, | |
70 | .name = "synth", | |
71 | .fops = &synth_fops, | |
72 | }; | |
73 | ||
74 | void speakup_register_devsynth(void) | |
75 | { | |
76 | if (misc_registered != 0) | |
77 | return; | |
78 | /* zero it so if register fails, deregister will not ref invalid ptrs */ | |
1fd16a31 | 79 | if (misc_register(&synth_device)) { |
c6e3fd22 | 80 | pr_warn("Couldn't initialize miscdevice /dev/synth.\n"); |
1fd16a31 | 81 | } else { |
29644b22 WH |
82 | pr_info("initialized device: /dev/synth, node (MAJOR %d, MINOR %d)\n", |
83 | MISC_MAJOR, SYNTH_MINOR); | |
c6e3fd22 WH |
84 | misc_registered = 1; |
85 | } | |
86 | } | |
87 | ||
88 | void speakup_unregister_devsynth(void) | |
89 | { | |
90 | if (!misc_registered) | |
91 | return; | |
92 | pr_info("speakup: unregistering synth device /dev/synth\n"); | |
93 | misc_deregister(&synth_device); | |
94 | misc_registered = 0; | |
95 | } |