1/* MiroSOUND PCM20 radio rds interface driver 2 * (c) 2001 Robert Siemer <Robert.Siemer@gmx.de> 3 * Thanks to Fred Seidel. See miropcm20-rds-core.c for further information. 4 */ 5 6/* Revision history: 7 * 8 * 2001-04-18 Robert Siemer <Robert.Siemer@gmx.de> 9 * separate file for user interface driver 10 */ 11 12#include <linux/module.h> 13#include <linux/init.h> 14#include <linux/slab.h> 15#include <asm/uaccess.h> 16#include <linux/devfs_fs_kernel.h> 17#include "miropcm20-rds-core.h" 18 19devfs_handle_t dfsh; 20char * text_buffer; 21static int rds_users = 0; 22 23 24static int rds_f_open(struct inode *in, struct file *fi) 25{ 26 if(rds_users) 27 return -EBUSY; 28 29 if ((text_buffer=kmalloc(66, GFP_KERNEL)) == 0) { 30 printk(KERN_NOTICE "aci-rds: Out of memory by open()...\n"); 31 return -ENOMEM; 32 } 33 34 rds_users++; 35 MOD_INC_USE_COUNT; 36 return 0; 37} 38 39static int rds_f_release(struct inode *in, struct file *fi) 40{ 41 kfree(text_buffer); 42 43 rds_users--; 44 MOD_DEC_USE_COUNT; 45 return 0; 46} 47 48static void print_matrix(char *ch, char out[]) 49{ 50 int j; 51 52 for (j=7; j>=0; j--) { 53 out[7-j] = ((*ch >> j) & 0x1) + '0'; 54 } 55} 56 57static ssize_t rds_f_read(struct file *file, char *buffer, size_t length, loff_t *offset) 58{ 59// i = sprintf(text_buffer, "length: %d, offset: %d\n", length, *offset); 60 61 char c; 62 char bits[8]; 63 64 current->state=TASK_UNINTERRUPTIBLE; 65 schedule_timeout(2*HZ); 66 aci_rds_cmd(RDS_STATUS, &c, 1); 67 print_matrix(&c, bits); 68 if (copy_to_user(buffer, bits, 8)) 69 return -EFAULT; 70 71/* if ((c >> 3) & 1) { 72 aci_rds_cmd(RDS_STATIONNAME, text_buffer+1, 8); 73 text_buffer[0] = ' ' ; 74 text_buffer[9] = '\n'; 75 return copy_to_user(buffer+8, text_buffer, 10) ? -EFAULT: 18; 76 } 77*/ 78/* if ((c >> 6) & 1) { 79 aci_rds_cmd(RDS_PTYTATP, &c, 1); 80 if ( c & 1) 81 sprintf(text_buffer, " M"); 82 else 83 sprintf(text_buffer, " S"); 84 if ((c >> 1) & 1) 85 sprintf(text_buffer+2, " TA"); 86 else 87 sprintf(text_buffer+2, " --"); 88 if ((c >> 7) & 1) 89 sprintf(text_buffer+5, " TP"); 90 else 91 sprintf(text_buffer+5, " --"); 92 sprintf(text_buffer+8, " %2d\n", (c >> 2) & 0x1f); 93 return copy_to_user(buffer+8, text_buffer, 12) ? -EFAULT: 20; 94 } 95*/ 96 97 if ((c >> 4) & 1) { 98 aci_rds_cmd(RDS_TEXT, text_buffer, 65); 99 text_buffer[0] = ' ' ; 100 text_buffer[65] = '\n'; 101 return copy_to_user(buffer+8, text_buffer,66) ? -EFAULT : 66+8; 102 } else { 103 put_user('\n', buffer+8); 104 return 9; 105 } 106} 107 108static struct file_operations rds_f_ops = { 109 read: rds_f_read, 110 open: rds_f_open, 111 release: rds_f_release 112}; 113 114 115static int __init miropcm20_rds_init(void) 116{ 117 if ((dfsh = devfs_register(NULL, "v4l/rds/radiotext", 118 DEVFS_FL_DEFAULT | DEVFS_FL_AUTO_DEVNUM, 119 0, 0, S_IRUGO | S_IFCHR, &rds_f_ops, NULL)) 120 == NULL) 121 goto devfs_register; 122 123 printk("miropcm20-rds: userinterface driver loaded.\n"); 124#if DEBUG 125 printk("v4l-name: %s\n", devfs_get_name(pcm20_radio.devfs_handle, 0)); 126#endif 127 128 return 0; 129 130 devfs_register: 131 return -EINVAL; 132} 133 134static void __exit miropcm20_rds_cleanup(void) 135{ 136 devfs_unregister(dfsh); 137} 138 139module_init(miropcm20_rds_init); 140module_exit(miropcm20_rds_cleanup); 141MODULE_LICENSE("GPL"); 142