pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / media / radio / miropcm20-rds.c
blobaed11477378bd5bf018a9d7a4eec1e9c960ca86e
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 */
6 /* Revision history:
8 * 2001-04-18 Robert Siemer <Robert.Siemer@gmx.de>
9 * separate file for user interface driver
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"
21 static char * text_buffer;
22 static int rds_users = 0;
25 static int rds_f_open(struct inode *in, struct file *fi)
27 if (rds_users)
28 return -EBUSY;
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;
37 return 0;
40 static int rds_f_release(struct inode *in, struct file *fi)
42 kfree(text_buffer);
44 rds_users--;
45 return 0;
48 static void print_matrix(char *ch, char out[])
50 int j;
52 for (j=7; j>=0; j--) {
53 out[7-j] = ((*ch >> j) & 0x1) + '0';
57 static ssize_t rds_f_read(struct file *file, char __user *buffer, size_t length, loff_t *offset)
59 // i = sprintf(text_buffer, "length: %d, offset: %d\n", length, *offset);
61 char c;
62 char bits[8];
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;
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;
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;
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;
107 static const struct file_operations rds_fops = {
108 .owner = THIS_MODULE,
109 .read = rds_f_read,
110 .open = rds_f_open,
111 .release = rds_f_release
114 static struct miscdevice rds_miscdev = {
115 .minor = MISC_DYNAMIC_MINOR,
116 .name = "radiotext",
117 .fops = &rds_fops,
120 static int __init miropcm20_rds_init(void)
122 return misc_register(&rds_miscdev);
125 static void __exit miropcm20_rds_cleanup(void)
127 misc_deregister(&rds_miscdev);
130 module_init(miropcm20_rds_init);
131 module_exit(miropcm20_rds_cleanup);
132 MODULE_LICENSE("GPL");