316 lines
7.3 KiB
C
316 lines
7.3 KiB
C
/* radio-aztech.c - Aztech radio card driver for Linux 2.2
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*
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* Adapted to support the Video for Linux API by
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* Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
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*
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* Quay Ly
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* Donald Song
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* Jason Lewis (jlewis@twilight.vtc.vsc.edu)
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* Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
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* William McGrath (wmcgrath@twilight.vtc.vsc.edu)
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*
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* The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
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* along with more information on the card itself.
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*
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* History:
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* 1999-02-24 Russell Kroll <rkroll@exploits.org>
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* Fine tuning/VIDEO_TUNER_LOW
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* Range expanded to 87-108 MHz (from 87.9-107.8)
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*
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* Notable changes from the original source:
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* - includes stripped down to the essentials
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* - for loops used as delays replaced with udelay()
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* - #defines removed, changed to static values
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* - tuning structure changed - no more character arrays, other changes
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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> /* 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_AZTECH_PORT */
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/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
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#ifndef CONFIG_RADIO_AZTECH_PORT
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#define CONFIG_RADIO_AZTECH_PORT -1
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#endif
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static int io = CONFIG_RADIO_AZTECH_PORT;
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static int radio_nr = -1;
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static int radio_wait_time = 1000;
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static struct semaphore lock;
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struct az_device
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{
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int curvol;
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unsigned long curfreq;
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int stereo;
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};
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static int volconvert(int level)
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{
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level>>=14; /* Map 16bits down to 2 bit */
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level&=3;
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/* convert to card-friendly values */
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switch (level)
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{
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case 0:
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return 0;
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case 1:
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return 1;
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case 2:
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return 4;
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case 3:
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return 5;
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}
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return 0; /* Quieten gcc */
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}
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static void send_0_byte (struct az_device *dev)
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{
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udelay(radio_wait_time);
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outb_p(2+volconvert(dev->curvol), io);
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outb_p(64+2+volconvert(dev->curvol), io);
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}
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static void send_1_byte (struct az_device *dev)
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{
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udelay (radio_wait_time);
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outb_p(128+2+volconvert(dev->curvol), io);
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outb_p(128+64+2+volconvert(dev->curvol), io);
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}
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static int az_setvol(struct az_device *dev, int vol)
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{
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down(&lock);
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outb (volconvert(vol), io);
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up(&lock);
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return 0;
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}
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/* thanks to Michael Dwyer for giving me a dose of clues in
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* the signal strength department..
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*
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* This card has a stereo bit - bit 0 set = mono, not set = stereo
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* It also has a "signal" bit - bit 1 set = bad signal, not set = good
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*
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*/
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static int az_getsigstr(struct az_device *dev)
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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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static int az_getstereo(struct az_device *dev)
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{
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if (inb(io) & 1) /* bit set = mono */
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return 0;
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return 1; /* stereo */
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}
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static int az_setfreq(struct az_device *dev, unsigned long frequency)
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{
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int i;
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frequency += 171200; /* Add 10.7 MHz IF */
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frequency /= 800; /* Convert to 50 kHz units */
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down(&lock);
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send_0_byte (dev); /* 0: LSB of frequency */
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for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
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if (frequency & (1 << i))
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send_1_byte (dev);
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else
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send_0_byte (dev);
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send_0_byte (dev); /* 14: test bit - always 0 */
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send_0_byte (dev); /* 15: test bit - always 0 */
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send_0_byte (dev); /* 16: band data 0 - always 0 */
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if (dev->stereo) /* 17: stereo (1 to enable) */
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send_1_byte (dev);
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else
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send_0_byte (dev);
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send_1_byte (dev); /* 18: band data 1 - unknown */
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send_0_byte (dev); /* 19: time base - always 0 */
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send_0_byte (dev); /* 20: spacing (0 = 25 kHz) */
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send_1_byte (dev); /* 21: spacing (1 = 25 kHz) */
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send_0_byte (dev); /* 22: spacing (0 = 25 kHz) */
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send_1_byte (dev); /* 23: AM/FM (FM = 1, always) */
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/* latch frequency */
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udelay (radio_wait_time);
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outb_p(128+64+volconvert(dev->curvol), io);
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up(&lock);
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return 0;
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}
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static int az_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 az_device *az = 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, "Aztech Radio");
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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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v->signal=0xFFFF*az_getsigstr(az);
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if(az_getstereo(az))
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v->flags|=VIDEO_TUNER_STEREO_ON;
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strcpy(v->name, "FM");
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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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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 = az->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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az->curfreq = *freq;
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az_setfreq(az, az->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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if(az->stereo)
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v->mode=VIDEO_SOUND_STEREO;
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else
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v->mode=VIDEO_SOUND_MONO;
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v->volume=az->curvol;
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v->step=16384;
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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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az->curvol=v->volume;
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az->stereo=(v->mode&VIDEO_SOUND_STEREO)?1:0;
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if(v->flags&VIDEO_AUDIO_MUTE)
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az_setvol(az,0);
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else
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az_setvol(az,az->curvol);
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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 az_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, az_do_ioctl);
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}
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static struct az_device aztech_unit;
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static struct file_operations aztech_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 = az_ioctl,
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.llseek = no_llseek,
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};
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static struct video_device aztech_radio=
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{
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.owner = THIS_MODULE,
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.name = "Aztech radio",
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.type = VID_TYPE_TUNER,
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.hardware = VID_HARDWARE_AZTECH,
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.fops = &aztech_fops,
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};
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static int __init aztech_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, "aztech"))
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{
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printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
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return -EBUSY;
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}
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init_MUTEX(&lock);
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aztech_radio.priv=&aztech_unit;
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if(video_register_device(&aztech_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 "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
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/* mute card - prevents noisy bootups */
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outb (0, io);
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return 0;
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}
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MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
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MODULE_DESCRIPTION("A driver for the Aztech radio card.");
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MODULE_LICENSE("GPL");
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module_param(io, int, 0);
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module_param(radio_nr, int, 0);
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MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
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static void __exit aztech_cleanup(void)
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{
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video_unregister_device(&aztech_radio);
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release_region(io,2);
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}
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module_init(aztech_init);
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module_exit(aztech_cleanup);
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