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Commit | Line | Data |
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1da177e4 LT |
1 | /* MiroSOUND PCM20 radio rds interface driver |
2 | * (c) 2001 Robert Siemer <Robert.Siemer@gmx.de> | |
3 | * Thanks to Fred Seidel. See miropcm20-rds-core.c for further information. | |
4 | */ | |
5 | ||
6 | /* Revision history: | |
7 | * | |
8 | * 2001-04-18 Robert Siemer <Robert.Siemer@gmx.de> | |
9 | * separate file for user interface driver | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/miscdevice.h> | |
17 | #include <linux/delay.h> | |
18 | #include <asm/uaccess.h> | |
19 | #include "miropcm20-rds-core.h" | |
20 | ||
21 | static char * text_buffer; | |
22 | static int rds_users = 0; | |
23 | ||
24 | ||
25 | static int rds_f_open(struct inode *in, struct file *fi) | |
26 | { | |
27 | if (rds_users) | |
28 | return -EBUSY; | |
29 | ||
30 | rds_users++; | |
31 | if ((text_buffer=kmalloc(66, GFP_KERNEL)) == 0) { | |
32 | rds_users--; | |
33 | printk(KERN_NOTICE "aci-rds: Out of memory by open()...\n"); | |
34 | return -ENOMEM; | |
35 | } | |
36 | ||
37 | return 0; | |
38 | } | |
39 | ||
40 | static int rds_f_release(struct inode *in, struct file *fi) | |
41 | { | |
42 | kfree(text_buffer); | |
43 | ||
44 | rds_users--; | |
45 | return 0; | |
46 | } | |
47 | ||
48 | static void print_matrix(char *ch, char out[]) | |
49 | { | |
50 | int j; | |
51 | ||
52 | for (j=7; j>=0; j--) { | |
53 | out[7-j] = ((*ch >> j) & 0x1) + '0'; | |
54 | } | |
55 | } | |
56 | ||
57 | static ssize_t rds_f_read(struct file *file, char __user *buffer, size_t length, loff_t *offset) | |
58 | { | |
59 | // i = sprintf(text_buffer, "length: %d, offset: %d\n", length, *offset); | |
60 | ||
61 | char c; | |
62 | char bits[8]; | |
63 | ||
64 | msleep(2000); | |
65 | aci_rds_cmd(RDS_STATUS, &c, 1); | |
66 | print_matrix(&c, bits); | |
67 | if (copy_to_user(buffer, bits, 8)) | |
68 | return -EFAULT; | |
69 | ||
70 | /* if ((c >> 3) & 1) { | |
71 | aci_rds_cmd(RDS_STATIONNAME, text_buffer+1, 8); | |
72 | text_buffer[0] = ' ' ; | |
73 | text_buffer[9] = '\n'; | |
74 | return copy_to_user(buffer+8, text_buffer, 10) ? -EFAULT: 18; | |
75 | } | |
76 | */ | |
77 | /* if ((c >> 6) & 1) { | |
78 | aci_rds_cmd(RDS_PTYTATP, &c, 1); | |
79 | if ( c & 1) | |
80 | sprintf(text_buffer, " M"); | |
81 | else | |
82 | sprintf(text_buffer, " S"); | |
83 | if ((c >> 1) & 1) | |
84 | sprintf(text_buffer+2, " TA"); | |
85 | else | |
86 | sprintf(text_buffer+2, " --"); | |
87 | if ((c >> 7) & 1) | |
88 | sprintf(text_buffer+5, " TP"); | |
89 | else | |
90 | sprintf(text_buffer+5, " --"); | |
91 | sprintf(text_buffer+8, " %2d\n", (c >> 2) & 0x1f); | |
92 | return copy_to_user(buffer+8, text_buffer, 12) ? -EFAULT: 20; | |
93 | } | |
94 | */ | |
95 | ||
96 | if ((c >> 4) & 1) { | |
97 | aci_rds_cmd(RDS_TEXT, text_buffer, 65); | |
98 | text_buffer[0] = ' ' ; | |
99 | text_buffer[65] = '\n'; | |
100 | return copy_to_user(buffer+8, text_buffer,66) ? -EFAULT : 66+8; | |
101 | } else { | |
102 | put_user('\n', buffer+8); | |
103 | return 9; | |
104 | } | |
105 | } | |
106 | ||
107 | static struct file_operations rds_fops = { | |
108 | .owner = THIS_MODULE, | |
109 | .read = rds_f_read, | |
110 | .open = rds_f_open, | |
111 | .release = rds_f_release | |
112 | }; | |
113 | ||
114 | static struct miscdevice rds_miscdev = { | |
115 | .minor = MISC_DYNAMIC_MINOR, | |
116 | .name = "radiotext", | |
117 | .devfs_name = "v4l/rds/radiotext", | |
118 | .fops = &rds_fops, | |
119 | }; | |
120 | ||
121 | static int __init miropcm20_rds_init(void) | |
122 | { | |
123 | return misc_register(&rds_miscdev); | |
124 | } | |
125 | ||
126 | static void __exit miropcm20_rds_cleanup(void) | |
127 | { | |
128 | misc_deregister(&rds_miscdev); | |
129 | } | |
130 | ||
131 | module_init(miropcm20_rds_init); | |
132 | module_exit(miropcm20_rds_cleanup); | |
133 | MODULE_LICENSE("GPL"); |