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