134 lines
2.8 KiB
C
134 lines
2.8 KiB
C
/* MiroSOUND PCM20 radio rds interface driver
|
|
* (c) 2001 Robert Siemer <Robert.Siemer@gmx.de>
|
|
* Thanks to Fred Seidel. See miropcm20-rds-core.c for further information.
|
|
*/
|
|
|
|
/* Revision history:
|
|
*
|
|
* 2001-04-18 Robert Siemer <Robert.Siemer@gmx.de>
|
|
* separate file for user interface driver
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/delay.h>
|
|
#include <asm/uaccess.h>
|
|
#include "miropcm20-rds-core.h"
|
|
|
|
static char * text_buffer;
|
|
static int rds_users = 0;
|
|
|
|
|
|
static int rds_f_open(struct inode *in, struct file *fi)
|
|
{
|
|
if (rds_users)
|
|
return -EBUSY;
|
|
|
|
rds_users++;
|
|
if ((text_buffer=kmalloc(66, GFP_KERNEL)) == 0) {
|
|
rds_users--;
|
|
printk(KERN_NOTICE "aci-rds: Out of memory by open()...\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rds_f_release(struct inode *in, struct file *fi)
|
|
{
|
|
kfree(text_buffer);
|
|
|
|
rds_users--;
|
|
return 0;
|
|
}
|
|
|
|
static void print_matrix(char *ch, char out[])
|
|
{
|
|
int j;
|
|
|
|
for (j=7; j>=0; j--) {
|
|
out[7-j] = ((*ch >> j) & 0x1) + '0';
|
|
}
|
|
}
|
|
|
|
static ssize_t rds_f_read(struct file *file, char __user *buffer, size_t length, loff_t *offset)
|
|
{
|
|
// i = sprintf(text_buffer, "length: %d, offset: %d\n", length, *offset);
|
|
|
|
char c;
|
|
char bits[8];
|
|
|
|
msleep(2000);
|
|
aci_rds_cmd(RDS_STATUS, &c, 1);
|
|
print_matrix(&c, bits);
|
|
if (copy_to_user(buffer, bits, 8))
|
|
return -EFAULT;
|
|
|
|
/* if ((c >> 3) & 1) {
|
|
aci_rds_cmd(RDS_STATIONNAME, text_buffer+1, 8);
|
|
text_buffer[0] = ' ' ;
|
|
text_buffer[9] = '\n';
|
|
return copy_to_user(buffer+8, text_buffer, 10) ? -EFAULT: 18;
|
|
}
|
|
*/
|
|
/* if ((c >> 6) & 1) {
|
|
aci_rds_cmd(RDS_PTYTATP, &c, 1);
|
|
if ( c & 1)
|
|
sprintf(text_buffer, " M");
|
|
else
|
|
sprintf(text_buffer, " S");
|
|
if ((c >> 1) & 1)
|
|
sprintf(text_buffer+2, " TA");
|
|
else
|
|
sprintf(text_buffer+2, " --");
|
|
if ((c >> 7) & 1)
|
|
sprintf(text_buffer+5, " TP");
|
|
else
|
|
sprintf(text_buffer+5, " --");
|
|
sprintf(text_buffer+8, " %2d\n", (c >> 2) & 0x1f);
|
|
return copy_to_user(buffer+8, text_buffer, 12) ? -EFAULT: 20;
|
|
}
|
|
*/
|
|
|
|
if ((c >> 4) & 1) {
|
|
aci_rds_cmd(RDS_TEXT, text_buffer, 65);
|
|
text_buffer[0] = ' ' ;
|
|
text_buffer[65] = '\n';
|
|
return copy_to_user(buffer+8, text_buffer,66) ? -EFAULT : 66+8;
|
|
} else {
|
|
put_user('\n', buffer+8);
|
|
return 9;
|
|
}
|
|
}
|
|
|
|
static struct file_operations rds_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = rds_f_read,
|
|
.open = rds_f_open,
|
|
.release = rds_f_release
|
|
};
|
|
|
|
static struct miscdevice rds_miscdev = {
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
.name = "radiotext",
|
|
.devfs_name = "v4l/rds/radiotext",
|
|
.fops = &rds_fops,
|
|
};
|
|
|
|
static int __init miropcm20_rds_init(void)
|
|
{
|
|
return misc_register(&rds_miscdev);
|
|
}
|
|
|
|
static void __exit miropcm20_rds_cleanup(void)
|
|
{
|
|
misc_deregister(&rds_miscdev);
|
|
}
|
|
|
|
module_init(miropcm20_rds_init);
|
|
module_exit(miropcm20_rds_cleanup);
|
|
MODULE_LICENSE("GPL");
|