diff options
Diffstat (limited to 'drivers/media/radio/miropcm20-rds.c')
| -rw-r--r-- | drivers/media/radio/miropcm20-rds.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/drivers/media/radio/miropcm20-rds.c b/drivers/media/radio/miropcm20-rds.c new file mode 100644 index 00000000000..df79d5e0aae --- /dev/null +++ b/drivers/media/radio/miropcm20-rds.c @@ -0,0 +1,133 @@ +/* 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 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"); |