diff options
Diffstat (limited to 'drivers/media/radio/miropcm20-rds-core.c')
| -rw-r--r-- | drivers/media/radio/miropcm20-rds-core.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/drivers/media/radio/miropcm20-rds-core.c b/drivers/media/radio/miropcm20-rds-core.c deleted file mode 100644 index 9428d8b2642..00000000000 --- a/drivers/media/radio/miropcm20-rds-core.c +++ /dev/null @@ -1,211 +0,0 @@ -/* - * Many thanks to Fred Seidel <seidel@metabox.de>, the - * designer of the RDS decoder hardware. With his help - * I was able to code this driver. - * Thanks also to Norberto Pellicci, Dominic Mounteney - * <DMounteney@pinnaclesys.com> and www.teleauskunft.de - * for good hints on finding Fred. It was somewhat hard - * to locate him here in Germany... [: - * - * Revision history: - * - * 2000-08-09 Robert Siemer <Robert.Siemer@gmx.de> - * RDS support for MiroSound PCM20 radio - */ - -#include <linux/module.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/mutex.h> - -#include <asm/io.h> -#include "oss/aci.h" -#include "miropcm20-rds-core.h" - -#define DEBUG 0 - -static struct mutex aci_rds_mutex; - -#define RDS_DATASHIFT 2 /* Bit 2 */ -#define RDS_DATAMASK (1 << RDS_DATASHIFT) -#define RDS_BUSYMASK 0x10 /* Bit 4 */ -#define RDS_CLOCKMASK 0x08 /* Bit 3 */ - -#define RDS_DATA(x) (((x) >> RDS_DATASHIFT) & 1) - - -#if DEBUG -static void print_matrix(char array[], unsigned int length) -{ - int i, j; - - for (i=0; i<length; i++) { - printk(KERN_DEBUG "aci-rds: "); - for (j=7; j>=0; j--) { - printk("%d", (array[i] >> j) & 0x1); - } - if (i%8 == 0) - printk(" byte-border\n"); - else - printk("\n"); - } -} -#endif /* DEBUG */ - -static int byte2trans(unsigned char byte, unsigned char sendbuffer[], int size) -{ - int i; - - if (size != 8) - return -1; - for (i = 7; i >= 0; i--) - sendbuffer[7-i] = (byte & (1 << i)) ? RDS_DATAMASK : 0; - sendbuffer[0] |= RDS_CLOCKMASK; - - return 0; -} - -static int rds_waitread(void) -{ - unsigned char byte; - int i=2000; - - do { - byte=inb(RDS_REGISTER); - i--; - } - while ((byte & RDS_BUSYMASK) && i); - - if (i) { - #if DEBUG - printk(KERN_DEBUG "rds_waitread()"); - print_matrix(&byte, 1); - #endif - return (byte); - } else { - printk(KERN_WARNING "aci-rds: rds_waitread() timeout...\n"); - return -1; - } -} - -/* don't use any ..._nowait() function if you are not sure what you do... */ - -static inline void rds_rawwrite_nowait(unsigned char byte) -{ - #if DEBUG - printk(KERN_DEBUG "rds_rawwrite()"); - print_matrix(&byte, 1); - #endif - outb(byte, RDS_REGISTER); -} - -static int rds_rawwrite(unsigned char byte) -{ - if (rds_waitread() >= 0) { - rds_rawwrite_nowait(byte); - return 0; - } else - return -1; -} - -static int rds_write(unsigned char cmd) -{ - unsigned char sendbuffer[8]; - int i; - - if (byte2trans(cmd, sendbuffer, 8) != 0){ - return -1; - } else { - for (i=0; i<8; i++) { - rds_rawwrite(sendbuffer[i]); - } - } - return 0; -} - -static int rds_readcycle_nowait(void) -{ - rds_rawwrite_nowait(0); - return rds_waitread(); -} - -static int rds_readcycle(void) -{ - if (rds_rawwrite(0) < 0) - return -1; - return rds_waitread(); -} - -static int rds_read(unsigned char databuffer[], int datasize) -{ - #define READSIZE (8*datasize) - - int i,j; - - if (datasize < 1) /* nothing to read */ - return 0; - - /* to be able to use rds_readcycle_nowait() - I have to waitread() here */ - if (rds_waitread() < 0) - return -1; - - memset(databuffer, 0, datasize); - - for (i=0; i< READSIZE; i++) - if((j=rds_readcycle_nowait()) < 0) { - return -1; - } else { - databuffer[i/8]|=(RDS_DATA(j) << (7-(i%8))); - } - - return 0; -} - -static int rds_ack(void) -{ - int i=rds_readcycle(); - - if (i < 0) - return -1; - if (i & RDS_DATAMASK) { - return 0; /* ACK */ - } else { - printk(KERN_DEBUG "aci-rds: NACK\n"); - return 1; /* NACK */ - } -} - -int aci_rds_cmd(unsigned char cmd, unsigned char databuffer[], int datasize) -{ - int ret; - - if (mutex_lock_interruptible(&aci_rds_mutex)) - return -EINTR; - - rds_write(cmd); - - /* RDS_RESET doesn't need further processing */ - if (cmd!=RDS_RESET && (rds_ack() || rds_read(databuffer, datasize))) - ret = -1; - else - ret = 0; - - mutex_unlock(&aci_rds_mutex); - - return ret; -} -EXPORT_SYMBOL(aci_rds_cmd); - -int __init attach_aci_rds(void) -{ - mutex_init(&aci_rds_mutex); - return 0; -} - -void __exit unload_aci_rds(void) -{ -} -MODULE_LICENSE("GPL"); |