/* 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/sched.h> /* current, TASK_*, schedule_timeout() */ #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");