Viewing file:  miropcm20-rds.c (2.99 KB) -rw-r--r--
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/* 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 <asm/uaccess.h>
#include <linux/devfs_fs_kernel.h>
#include "miropcm20-rds-core.h"
devfs_handle_t dfsh;
char * text_buffer;
static int rds_users = 0;
static int rds_f_open(struct inode *in, struct file *fi)
{
if(rds_users)
return -EBUSY;
if ((text_buffer=kmalloc(66, GFP_KERNEL)) == 0) {
printk(KERN_NOTICE "aci-rds: Out of memory by open()...\n");
return -ENOMEM;
}
rds_users++;
MOD_INC_USE_COUNT;
return 0;
}
static int rds_f_release(struct inode *in, struct file *fi)
{
kfree(text_buffer);
rds_users--;
MOD_DEC_USE_COUNT;
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 *buffer, size_t length, loff_t *offset)
{
// i = sprintf(text_buffer, "length: %d, offset: %d\n", length, *offset);
char c;
char bits[8];
current->state=TASK_UNINTERRUPTIBLE;
schedule_timeout(2*HZ);
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_f_ops = {
read: rds_f_read,
open: rds_f_open,
release: rds_f_release
};
static int __init miropcm20_rds_init(void)
{
if ((dfsh = devfs_register(NULL, "v4l/rds/radiotext",
DEVFS_FL_DEFAULT | DEVFS_FL_AUTO_DEVNUM,
0, 0, S_IRUGO | S_IFCHR, &rds_f_ops, NULL))
== NULL)
goto devfs_register;
printk("miropcm20-rds: userinterface driver loaded.\n");
#if DEBUG
printk("v4l-name: %s\n", devfs_get_name(pcm20_radio.devfs_handle, 0));
#endif
return 0;
devfs_register:
return -EINVAL;
}
static void __exit miropcm20_rds_cleanup(void)
{
devfs_unregister(dfsh);
}
module_init(miropcm20_rds_init);
module_exit(miropcm20_rds_cleanup);
MODULE_LICENSE("GPL");
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