714 lines
15 KiB
C
714 lines
15 KiB
C
/* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
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*
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* by Fred Gleason <fredg@wava.com>
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* Version 0.3.3
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*
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* (Loosely) based on code for the Aztech radio card by
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*
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* Russell Kroll (rkroll@exploits.org)
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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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* History:
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* 2000-04-29 Russell Kroll <rkroll@exploits.org>
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* Added ISAPnP detection for Linux 2.3/2.4
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*
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* 2001-01-10 Russell Kroll <rkroll@exploits.org>
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* Removed dead CONFIG_RADIO_CADET_PORT code
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* PnP detection on load is now default (no args necessary)
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*
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* 2002-01-17 Adam Belay <ambx1@neo.rr.com>
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* Updated to latest pnp code
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*
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* 2003-01-31 Alan Cox <alan@redhat.com>
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* Cleaned up locking, delay code, general odds and ends
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*
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* 2006-07-30 Hans J. Koch <koch@hjk-az.de>
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* Changed API to V4L2
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*/
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#include <linux/version.h>
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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/videodev2.h> /* V4L2 API defs */
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#include <media/v4l2-common.h>
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#include <linux/param.h>
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#include <linux/pnp.h>
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#define RDS_BUFFER 256
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#define RDS_RX_FLAG 1
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#define MBS_RX_FLAG 2
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#define CADET_VERSION KERNEL_VERSION(0,3,3)
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static struct v4l2_queryctrl radio_qctrl[] = {
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{
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.id = V4L2_CID_AUDIO_MUTE,
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.name = "Mute",
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.minimum = 0,
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.maximum = 1,
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.default_value = 1,
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.type = V4L2_CTRL_TYPE_BOOLEAN,
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},{
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.id = V4L2_CID_AUDIO_VOLUME,
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.name = "Volume",
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.minimum = 0,
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.maximum = 0xff,
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.step = 1,
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.default_value = 0xff,
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.type = V4L2_CTRL_TYPE_INTEGER,
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}
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};
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static int io=-1; /* default to isapnp activation */
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static int radio_nr = -1;
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static int users;
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static int curtuner;
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static int tunestat;
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static int sigstrength;
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static wait_queue_head_t read_queue;
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static struct timer_list readtimer;
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static __u8 rdsin, rdsout, rdsstat;
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static unsigned char rdsbuf[RDS_BUFFER];
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static spinlock_t cadet_io_lock;
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static int cadet_probe(void);
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/*
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* Signal Strength Threshold Values
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* The V4L API spec does not define any particular unit for the signal
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* strength value. These values are in microvolts of RF at the tuner's input.
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*/
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static __u16 sigtable[2][4]={{5,10,30,150},{28,40,63,1000}};
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static int
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cadet_getstereo(void)
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{
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int ret = V4L2_TUNER_SUB_MONO;
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if(curtuner != 0) /* Only FM has stereo capability! */
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return V4L2_TUNER_SUB_MONO;
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spin_lock(&cadet_io_lock);
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outb(7,io); /* Select tuner control */
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if( (inb(io+1) & 0x40) == 0)
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ret = V4L2_TUNER_SUB_STEREO;
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spin_unlock(&cadet_io_lock);
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return ret;
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}
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static unsigned
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cadet_gettune(void)
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{
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int curvol,i;
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unsigned fifo=0;
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/*
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* Prepare for read
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*/
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spin_lock(&cadet_io_lock);
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outb(7,io); /* Select tuner control */
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curvol=inb(io+1); /* Save current volume/mute setting */
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outb(0x00,io+1); /* Ensure WRITE-ENABLE is LOW */
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tunestat=0xffff;
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/*
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* Read the shift register
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*/
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for(i=0;i<25;i++) {
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fifo=(fifo<<1)|((inb(io+1)>>7)&0x01);
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if(i<24) {
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outb(0x01,io+1);
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tunestat&=inb(io+1);
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outb(0x00,io+1);
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}
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}
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/*
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* Restore volume/mute setting
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*/
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outb(curvol,io+1);
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spin_unlock(&cadet_io_lock);
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return fifo;
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}
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static unsigned
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cadet_getfreq(void)
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{
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int i;
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unsigned freq=0,test,fifo=0;
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/*
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* Read current tuning
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*/
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fifo=cadet_gettune();
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/*
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* Convert to actual frequency
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*/
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if(curtuner==0) { /* FM */
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test=12500;
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for(i=0;i<14;i++) {
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if((fifo&0x01)!=0) {
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freq+=test;
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}
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test=test<<1;
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fifo=fifo>>1;
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}
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freq-=10700000; /* IF frequency is 10.7 MHz */
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freq=(freq*16)/1000000; /* Make it 1/16 MHz */
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}
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if(curtuner==1) { /* AM */
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freq=((fifo&0x7fff)-2010)*16;
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}
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return freq;
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}
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static void
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cadet_settune(unsigned fifo)
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{
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int i;
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unsigned test;
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spin_lock(&cadet_io_lock);
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outb(7,io); /* Select tuner control */
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/*
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* Write the shift register
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*/
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test=0;
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test=(fifo>>23)&0x02; /* Align data for SDO */
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test|=0x1c; /* SDM=1, SWE=1, SEN=1, SCK=0 */
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outb(7,io); /* Select tuner control */
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outb(test,io+1); /* Initialize for write */
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for(i=0;i<25;i++) {
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test|=0x01; /* Toggle SCK High */
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outb(test,io+1);
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test&=0xfe; /* Toggle SCK Low */
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outb(test,io+1);
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fifo=fifo<<1; /* Prepare the next bit */
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test=0x1c|((fifo>>23)&0x02);
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outb(test,io+1);
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}
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spin_unlock(&cadet_io_lock);
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}
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static void
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cadet_setfreq(unsigned freq)
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{
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unsigned fifo;
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int i,j,test;
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int curvol;
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/*
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* Formulate a fifo command
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*/
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fifo=0;
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if(curtuner==0) { /* FM */
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test=102400;
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freq=(freq*1000)/16; /* Make it kHz */
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freq+=10700; /* IF is 10700 kHz */
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for(i=0;i<14;i++) {
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fifo=fifo<<1;
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if(freq>=test) {
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fifo|=0x01;
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freq-=test;
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}
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test=test>>1;
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}
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}
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if(curtuner==1) { /* AM */
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fifo=(freq/16)+2010; /* Make it kHz */
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fifo|=0x100000; /* Select AM Band */
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}
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/*
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* Save current volume/mute setting
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*/
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spin_lock(&cadet_io_lock);
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outb(7,io); /* Select tuner control */
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curvol=inb(io+1);
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spin_unlock(&cadet_io_lock);
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/*
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* Tune the card
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*/
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for(j=3;j>-1;j--) {
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cadet_settune(fifo|(j<<16));
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spin_lock(&cadet_io_lock);
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outb(7,io); /* Select tuner control */
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outb(curvol,io+1);
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spin_unlock(&cadet_io_lock);
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msleep(100);
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cadet_gettune();
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if((tunestat & 0x40) == 0) { /* Tuned */
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sigstrength=sigtable[curtuner][j];
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return;
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}
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}
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sigstrength=0;
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}
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static int
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cadet_getvol(void)
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{
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int ret = 0;
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spin_lock(&cadet_io_lock);
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outb(7,io); /* Select tuner control */
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if((inb(io + 1) & 0x20) != 0)
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ret = 0xffff;
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spin_unlock(&cadet_io_lock);
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return ret;
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}
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static void
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cadet_setvol(int vol)
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{
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spin_lock(&cadet_io_lock);
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outb(7,io); /* Select tuner control */
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if(vol>0)
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outb(0x20,io+1);
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else
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outb(0x00,io+1);
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spin_unlock(&cadet_io_lock);
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}
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static void
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cadet_handler(unsigned long data)
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{
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/*
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* Service the RDS fifo
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*/
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if(spin_trylock(&cadet_io_lock))
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{
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outb(0x3,io); /* Select RDS Decoder Control */
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if((inb(io+1)&0x20)!=0) {
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printk(KERN_CRIT "cadet: RDS fifo overflow\n");
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}
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outb(0x80,io); /* Select RDS fifo */
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while((inb(io)&0x80)!=0) {
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rdsbuf[rdsin]=inb(io+1);
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if(rdsin==rdsout)
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printk(KERN_WARNING "cadet: RDS buffer overflow\n");
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else
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rdsin++;
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}
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spin_unlock(&cadet_io_lock);
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}
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/*
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* Service pending read
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*/
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if( rdsin!=rdsout)
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wake_up_interruptible(&read_queue);
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/*
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* Clean up and exit
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*/
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init_timer(&readtimer);
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readtimer.function=cadet_handler;
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readtimer.data=(unsigned long)0;
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readtimer.expires=jiffies+msecs_to_jiffies(50);
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add_timer(&readtimer);
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}
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static ssize_t
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cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
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{
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int i=0;
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unsigned char readbuf[RDS_BUFFER];
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if(rdsstat==0) {
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spin_lock(&cadet_io_lock);
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rdsstat=1;
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outb(0x80,io); /* Select RDS fifo */
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spin_unlock(&cadet_io_lock);
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init_timer(&readtimer);
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readtimer.function=cadet_handler;
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readtimer.data=(unsigned long)0;
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readtimer.expires=jiffies+msecs_to_jiffies(50);
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add_timer(&readtimer);
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}
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if(rdsin==rdsout) {
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if (file->f_flags & O_NONBLOCK)
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return -EWOULDBLOCK;
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interruptible_sleep_on(&read_queue);
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}
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while( i<count && rdsin!=rdsout)
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readbuf[i++]=rdsbuf[rdsout++];
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if (copy_to_user(data,readbuf,i))
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return -EFAULT;
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return i;
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}
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *v)
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{
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v->capabilities =
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V4L2_CAP_TUNER |
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V4L2_CAP_READWRITE;
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v->version = CADET_VERSION;
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strcpy(v->driver, "ADS Cadet");
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strcpy(v->card, "ADS Cadet");
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return 0;
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}
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static int vidioc_g_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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v->type = V4L2_TUNER_RADIO;
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switch (v->index) {
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case 0:
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strcpy(v->name, "FM");
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v->capability = V4L2_TUNER_CAP_STEREO;
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v->rangelow = 1400; /* 87.5 MHz */
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v->rangehigh = 1728; /* 108.0 MHz */
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v->rxsubchans=cadet_getstereo();
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switch (v->rxsubchans){
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case V4L2_TUNER_SUB_MONO:
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v->audmode = V4L2_TUNER_MODE_MONO;
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break;
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case V4L2_TUNER_SUB_STEREO:
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v->audmode = V4L2_TUNER_MODE_STEREO;
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break;
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default: ;
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}
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break;
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case 1:
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strcpy(v->name, "AM");
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v->capability = V4L2_TUNER_CAP_LOW;
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v->rangelow = 8320; /* 520 kHz */
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v->rangehigh = 26400; /* 1650 kHz */
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v->rxsubchans = V4L2_TUNER_SUB_MONO;
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v->audmode = V4L2_TUNER_MODE_MONO;
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break;
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default:
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return -EINVAL;
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}
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v->signal = sigstrength; /* We might need to modify scaling of this */
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return 0;
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}
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static int vidioc_s_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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if((v->index != 0)&&(v->index != 1))
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return -EINVAL;
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curtuner = v->index;
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return 0;
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}
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static int vidioc_g_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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f->tuner = curtuner;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = cadet_getfreq();
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return 0;
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}
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static int vidioc_s_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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if (f->type != V4L2_TUNER_RADIO)
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return -EINVAL;
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if((curtuner==0)&&((f->frequency<1400)||(f->frequency>1728)))
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return -EINVAL;
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if((curtuner==1)&&((f->frequency<8320)||(f->frequency>26400)))
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return -EINVAL;
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cadet_setfreq(f->frequency);
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return 0;
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}
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static int vidioc_queryctrl(struct file *file, void *priv,
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struct v4l2_queryctrl *qc)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
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if (qc->id && qc->id == radio_qctrl[i].id) {
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memcpy(qc, &(radio_qctrl[i]),
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sizeof(*qc));
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return 0;
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}
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}
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return -EINVAL;
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}
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static int vidioc_g_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
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{
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switch (ctrl->id){
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case V4L2_CID_AUDIO_MUTE: /* TODO: Handle this correctly */
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ctrl->value = (cadet_getvol() == 0);
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break;
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case V4L2_CID_AUDIO_VOLUME:
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ctrl->value = cadet_getvol();
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int vidioc_s_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
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{
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switch (ctrl->id){
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case V4L2_CID_AUDIO_MUTE: /* TODO: Handle this correctly */
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if (ctrl->value)
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cadet_setvol(0);
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else
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cadet_setvol(0xffff);
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break;
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case V4L2_CID_AUDIO_VOLUME:
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cadet_setvol(ctrl->value);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int vidioc_g_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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if (a->index > 1)
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return -EINVAL;
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strcpy(a->name, "Radio");
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a->capability = V4L2_AUDCAP_STEREO;
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return 0;
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}
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static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
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{
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*i = 0;
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return 0;
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}
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static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
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{
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if (i != 0)
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return -EINVAL;
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return 0;
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}
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static int vidioc_s_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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if (a->index != 0)
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return -EINVAL;
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return 0;
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}
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static int
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cadet_open(struct inode *inode, struct file *file)
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{
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users++;
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if (1 == users) init_waitqueue_head(&read_queue);
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return 0;
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}
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static int
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cadet_release(struct inode *inode, struct file *file)
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{
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users--;
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|
if (0 == users){
|
|
del_timer_sync(&readtimer);
|
|
rdsstat=0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int
|
|
cadet_poll(struct file *file, struct poll_table_struct *wait)
|
|
{
|
|
poll_wait(file,&read_queue,wait);
|
|
if(rdsin != rdsout)
|
|
return POLLIN | POLLRDNORM;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static const struct file_operations cadet_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = cadet_open,
|
|
.release = cadet_release,
|
|
.read = cadet_read,
|
|
.ioctl = video_ioctl2,
|
|
.poll = cadet_poll,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = v4l_compat_ioctl32,
|
|
#endif
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct video_device cadet_radio=
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.name = "Cadet radio",
|
|
.type = VID_TYPE_TUNER,
|
|
.fops = &cadet_fops,
|
|
.vidioc_querycap = vidioc_querycap,
|
|
.vidioc_g_tuner = vidioc_g_tuner,
|
|
.vidioc_s_tuner = vidioc_s_tuner,
|
|
.vidioc_g_frequency = vidioc_g_frequency,
|
|
.vidioc_s_frequency = vidioc_s_frequency,
|
|
.vidioc_queryctrl = vidioc_queryctrl,
|
|
.vidioc_g_ctrl = vidioc_g_ctrl,
|
|
.vidioc_s_ctrl = vidioc_s_ctrl,
|
|
.vidioc_g_audio = vidioc_g_audio,
|
|
.vidioc_s_audio = vidioc_s_audio,
|
|
.vidioc_g_input = vidioc_g_input,
|
|
.vidioc_s_input = vidioc_s_input,
|
|
};
|
|
|
|
#ifdef CONFIG_PNP
|
|
|
|
static struct pnp_device_id cadet_pnp_devices[] = {
|
|
/* ADS Cadet AM/FM Radio Card */
|
|
{.id = "MSM0c24", .driver_data = 0},
|
|
{.id = ""}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);
|
|
|
|
static int cadet_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id)
|
|
{
|
|
if (!dev)
|
|
return -ENODEV;
|
|
/* only support one device */
|
|
if (io > 0)
|
|
return -EBUSY;
|
|
|
|
if (!pnp_port_valid(dev, 0)) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
io = pnp_port_start(dev, 0);
|
|
|
|
printk ("radio-cadet: PnP reports device at %#x\n", io);
|
|
|
|
return io;
|
|
}
|
|
|
|
static struct pnp_driver cadet_pnp_driver = {
|
|
.name = "radio-cadet",
|
|
.id_table = cadet_pnp_devices,
|
|
.probe = cadet_pnp_probe,
|
|
.remove = NULL,
|
|
};
|
|
|
|
#else
|
|
static struct pnp_driver cadet_pnp_driver;
|
|
#endif
|
|
|
|
static int cadet_probe(void)
|
|
{
|
|
static int iovals[8]={0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e};
|
|
int i;
|
|
|
|
for(i=0;i<8;i++) {
|
|
io=iovals[i];
|
|
if (request_region(io, 2, "cadet-probe")) {
|
|
cadet_setfreq(1410);
|
|
if(cadet_getfreq()==1410) {
|
|
release_region(io, 2);
|
|
return io;
|
|
}
|
|
release_region(io, 2);
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* io should only be set if the user has used something like
|
|
* isapnp (the userspace program) to initialize this card for us
|
|
*/
|
|
|
|
static int __init cadet_init(void)
|
|
{
|
|
spin_lock_init(&cadet_io_lock);
|
|
|
|
/*
|
|
* If a probe was requested then probe ISAPnP first (safest)
|
|
*/
|
|
if (io < 0)
|
|
pnp_register_driver(&cadet_pnp_driver);
|
|
/*
|
|
* If that fails then probe unsafely if probe is requested
|
|
*/
|
|
if(io < 0)
|
|
io = cadet_probe ();
|
|
|
|
/*
|
|
* Else we bail out
|
|
*/
|
|
|
|
if(io < 0) {
|
|
#ifdef MODULE
|
|
printk(KERN_ERR "You must set an I/O address with io=0x???\n");
|
|
#endif
|
|
goto fail;
|
|
}
|
|
if (!request_region(io,2,"cadet"))
|
|
goto fail;
|
|
if(video_register_device(&cadet_radio,VFL_TYPE_RADIO,radio_nr)==-1) {
|
|
release_region(io,2);
|
|
goto fail;
|
|
}
|
|
printk(KERN_INFO "ADS Cadet Radio Card at 0x%x\n",io);
|
|
return 0;
|
|
fail:
|
|
pnp_unregister_driver(&cadet_pnp_driver);
|
|
return -1;
|
|
}
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
|
|
MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(io, int, 0);
|
|
MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
|
|
module_param(radio_nr, int, 0);
|
|
|
|
static void __exit cadet_cleanup_module(void)
|
|
{
|
|
video_unregister_device(&cadet_radio);
|
|
release_region(io,2);
|
|
pnp_unregister_driver(&cadet_pnp_driver);
|
|
}
|
|
|
|
module_init(cadet_init);
|
|
module_exit(cadet_cleanup_module);
|
|
|