diff options
Diffstat (limited to 'drivers/media/radio/radio-terratec.c')
| -rw-r--r-- | drivers/media/radio/radio-terratec.c | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-terratec.c b/drivers/media/radio/radio-terratec.c new file mode 100644 index 00000000000..248d67fde03 --- /dev/null +++ b/drivers/media/radio/radio-terratec.c @@ -0,0 +1,341 @@ +/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support + * (c) 1999 R. Offermanns (rolf@offermanns.de) + * based on the aimslab radio driver from M. Kirkwood + * many thanks to Michael Becker and Friedhelm Birth (from TerraTec) + * + * + * History: + * 1999-05-21 First preview release + * + * Notes on the hardware: + * There are two "main" chips on the card: + * - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf) + * - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf) + * (you can get the datasheet at the above links) + * + * Frequency control is done digitally -- ie out(port,encodefreq(95.8)); + * Volume Control is done digitally + * + * there is a I2C controlled RDS decoder (SAA6588) onboard, which i would like to support someday + * (as soon i have understand how to get started :) + * If you can help me out with that, please contact me!! + * + * + */ + +#include <linux/module.h> /* Modules */ +#include <linux/init.h> /* Initdata */ +#include <linux/ioport.h> /* check_region, request_region */ +#include <linux/delay.h> /* udelay */ +#include <asm/io.h> /* outb, outb_p */ +#include <asm/uaccess.h> /* copy to/from user */ +#include <linux/videodev.h> /* kernel radio structs */ +#include <linux/config.h> /* CONFIG_RADIO_TERRATEC_PORT */ +#include <linux/spinlock.h> + +#ifndef CONFIG_RADIO_TERRATEC_PORT +#define CONFIG_RADIO_TERRATEC_PORT 0x590 +#endif + +/**************** this ones are for the terratec *******************/ +#define BASEPORT 0x590 +#define VOLPORT 0x591 +#define WRT_DIS 0x00 +#define CLK_OFF 0x00 +#define IIC_DATA 0x01 +#define IIC_CLK 0x02 +#define DATA 0x04 +#define CLK_ON 0x08 +#define WRT_EN 0x10 +/*******************************************************************/ + +static int io = CONFIG_RADIO_TERRATEC_PORT; +static int radio_nr = -1; +static spinlock_t lock; + +struct tt_device +{ + int port; + int curvol; + unsigned long curfreq; + int muted; +}; + + +/* local things */ + +static void cardWriteVol(int volume) +{ + int i; + volume = volume+(volume * 32); // change both channels + spin_lock(&lock); + for (i=0;i<8;i++) + { + if (volume & (0x80>>i)) + outb(0x80, VOLPORT); + else outb(0x00, VOLPORT); + } + spin_unlock(&lock); +} + + + +static void tt_mute(struct tt_device *dev) +{ + dev->muted = 1; + cardWriteVol(0); +} + +static int tt_setvol(struct tt_device *dev, int vol) +{ + +// printk(KERN_ERR "setvol called, vol = %d\n", vol); + + if(vol == dev->curvol) { /* requested volume = current */ + if (dev->muted) { /* user is unmuting the card */ + dev->muted = 0; + cardWriteVol(vol); /* enable card */ + } + + return 0; + } + + if(vol == 0) { /* volume = 0 means mute the card */ + cardWriteVol(0); /* "turn off card" by setting vol to 0 */ + dev->curvol = vol; /* track the volume state! */ + return 0; + } + + dev->muted = 0; + + cardWriteVol(vol); + + dev->curvol = vol; + + return 0; + +} + + +/* this is the worst part in this driver */ +/* many more or less strange things are going on here, but hey, it works :) */ + +static int tt_setfreq(struct tt_device *dev, unsigned long freq1) +{ + int freq; + int i; + int p; + int temp; + long rest; + + unsigned char buffer[25]; /* we have to bit shift 25 registers */ + freq = freq1/160; /* convert the freq. to a nice to handle value */ + for(i=24;i>-1;i--) + buffer[i]=0; + + rest = freq*10+10700; /* i once had understood what is going on here */ + /* maybe some wise guy (friedhelm?) can comment this stuff */ + i=13; + p=10; + temp=102400; + while (rest!=0) + { + if (rest%temp == rest) + buffer[i] = 0; + else + { + buffer[i] = 1; + rest = rest-temp; + } + i--; + p--; + temp = temp/2; + } + + spin_lock(&lock); + + for (i=24;i>-1;i--) /* bit shift the values to the radiocard */ + { + if (buffer[i]==1) + { + outb(WRT_EN|DATA, BASEPORT); + outb(WRT_EN|DATA|CLK_ON , BASEPORT); + outb(WRT_EN|DATA, BASEPORT); + } + else + { + outb(WRT_EN|0x00, BASEPORT); + outb(WRT_EN|0x00|CLK_ON , BASEPORT); + } + } + outb(0x00, BASEPORT); + + spin_unlock(&lock); + + return 0; +} + +static int tt_getsigstr(struct tt_device *dev) /* TODO */ +{ + if (inb(io) & 2) /* bit set = no signal present */ + return 0; + return 1; /* signal present */ +} + + +/* implement the video4linux api */ + +static int tt_do_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, void *arg) +{ + struct video_device *dev = video_devdata(file); + struct tt_device *tt=dev->priv; + + switch(cmd) + { + case VIDIOCGCAP: + { + struct video_capability *v = arg; + memset(v,0,sizeof(*v)); + v->type=VID_TYPE_TUNER; + v->channels=1; + v->audios=1; + strcpy(v->name, "ActiveRadio"); + return 0; + } + case VIDIOCGTUNER: + { + struct video_tuner *v = arg; + if(v->tuner) /* Only 1 tuner */ + return -EINVAL; + v->rangelow=(87*16000); + v->rangehigh=(108*16000); + v->flags=VIDEO_TUNER_LOW; + v->mode=VIDEO_MODE_AUTO; + strcpy(v->name, "FM"); + v->signal=0xFFFF*tt_getsigstr(tt); + return 0; + } + case VIDIOCSTUNER: + { + struct video_tuner *v = arg; + if(v->tuner!=0) + return -EINVAL; + /* Only 1 tuner so no setting needed ! */ + return 0; + } + case VIDIOCGFREQ: + { + unsigned long *freq = arg; + *freq = tt->curfreq; + return 0; + } + case VIDIOCSFREQ: + { + unsigned long *freq = arg; + tt->curfreq = *freq; + tt_setfreq(tt, tt->curfreq); + return 0; + } + case VIDIOCGAUDIO: + { + struct video_audio *v = arg; + memset(v,0, sizeof(*v)); + v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME; + v->volume=tt->curvol * 6554; + v->step=6554; + strcpy(v->name, "Radio"); + return 0; + } + case VIDIOCSAUDIO: + { + struct video_audio *v = arg; + if(v->audio) + return -EINVAL; + if(v->flags&VIDEO_AUDIO_MUTE) + tt_mute(tt); + else + tt_setvol(tt,v->volume/6554); + return 0; + } + default: + return -ENOIOCTLCMD; + } +} + +static int tt_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return video_usercopy(inode, file, cmd, arg, tt_do_ioctl); +} + +static struct tt_device terratec_unit; + +static struct file_operations terratec_fops = { + .owner = THIS_MODULE, + .open = video_exclusive_open, + .release = video_exclusive_release, + .ioctl = tt_ioctl, + .llseek = no_llseek, +}; + +static struct video_device terratec_radio= +{ + .owner = THIS_MODULE, + .name = "TerraTec ActiveRadio", + .type = VID_TYPE_TUNER, + .hardware = VID_HARDWARE_TERRATEC, + .fops = &terratec_fops, +}; + +static int __init terratec_init(void) +{ + if(io==-1) + { + printk(KERN_ERR "You must set an I/O address with io=0x???\n"); + return -EINVAL; + } + if (!request_region(io, 2, "terratec")) + { + printk(KERN_ERR "TerraTec: port 0x%x already in use\n", io); + return -EBUSY; + } + + terratec_radio.priv=&terratec_unit; + + spin_lock_init(&lock); + + if(video_register_device(&terratec_radio, VFL_TYPE_RADIO, radio_nr)==-1) + { + release_region(io,2); + return -EINVAL; + } + + printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver.\n"); + + /* mute card - prevents noisy bootups */ + + /* this ensures that the volume is all the way down */ + cardWriteVol(0); + terratec_unit.curvol = 0; + + return 0; +} + +MODULE_AUTHOR("R.OFFERMANNS & others"); +MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card."); +MODULE_LICENSE("GPL"); +module_param(io, int, 0); +MODULE_PARM_DESC(io, "I/O address of the TerraTec ActiveRadio card (0x590 or 0x591)"); +module_param(radio_nr, int, 0); + +static void __exit terratec_cleanup_module(void) +{ + video_unregister_device(&terratec_radio); + release_region(io,2); + printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver unloaded.\n"); +} + +module_init(terratec_init); +module_exit(terratec_cleanup_module); + |