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miropcm20-rds.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 const 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",
      .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");

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