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