321 строка
6.8 KiB
C
321 строка
6.8 KiB
C
/* radio-trust.c - Trust FM Radio card driver for Linux 2.2
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* by Eric Lammerts <eric@scintilla.utwente.nl>
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*
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* Based on radio-aztech.c. Original notes:
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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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*/
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#include <stdarg.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <linux/videodev.h>
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#include <linux/config.h> /* CONFIG_RADIO_TRUST_PORT */
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/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
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#ifndef CONFIG_RADIO_TRUST_PORT
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#define CONFIG_RADIO_TRUST_PORT -1
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#endif
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static int io = CONFIG_RADIO_TRUST_PORT;
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static int radio_nr = -1;
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static int ioval = 0xf;
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static __u16 curvol;
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static __u16 curbass;
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static __u16 curtreble;
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static unsigned long curfreq;
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static int curstereo;
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static int curmute;
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/* i2c addresses */
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#define TDA7318_ADDR 0x88
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#define TSA6060T_ADDR 0xc4
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#define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
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#define TR_SET_SCL outb(ioval |= 2, io)
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#define TR_CLR_SCL outb(ioval &= 0xfd, io)
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#define TR_SET_SDA outb(ioval |= 1, io)
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#define TR_CLR_SDA outb(ioval &= 0xfe, io)
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static void write_i2c(int n, ...)
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{
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unsigned char val, mask;
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va_list args;
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va_start(args, n);
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/* start condition */
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TR_SET_SDA;
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TR_SET_SCL;
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TR_DELAY;
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TR_CLR_SDA;
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TR_CLR_SCL;
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TR_DELAY;
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for(; n; n--) {
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val = va_arg(args, unsigned);
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for(mask = 0x80; mask; mask >>= 1) {
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if(val & mask)
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TR_SET_SDA;
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else
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TR_CLR_SDA;
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TR_SET_SCL;
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TR_DELAY;
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TR_CLR_SCL;
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TR_DELAY;
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}
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/* acknowledge bit */
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TR_SET_SDA;
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TR_SET_SCL;
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TR_DELAY;
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TR_CLR_SCL;
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TR_DELAY;
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}
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/* stop condition */
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TR_CLR_SDA;
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TR_DELAY;
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TR_SET_SCL;
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TR_DELAY;
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TR_SET_SDA;
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TR_DELAY;
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va_end(args);
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}
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static void tr_setvol(__u16 vol)
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{
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curvol = vol / 2048;
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write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
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}
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static int basstreble2chip[15] = {
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0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
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};
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static void tr_setbass(__u16 bass)
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{
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curbass = bass / 4370;
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write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
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}
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static void tr_settreble(__u16 treble)
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{
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curtreble = treble / 4370;
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write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
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}
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static void tr_setstereo(int stereo)
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{
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curstereo = !!stereo;
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ioval = (ioval & 0xfb) | (!curstereo << 2);
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outb(ioval, io);
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}
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static void tr_setmute(int mute)
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{
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curmute = !!mute;
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ioval = (ioval & 0xf7) | (curmute << 3);
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outb(ioval, io);
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}
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static int tr_getsigstr(void)
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{
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int i, v;
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for(i = 0, v = 0; i < 100; i++) v |= inb(io);
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return (v & 1)? 0 : 0xffff;
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}
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static int tr_getstereo(void)
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{
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/* don't know how to determine it, just return the setting */
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return curstereo;
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}
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static void tr_setfreq(unsigned long f)
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{
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f /= 160; /* Convert to 10 kHz units */
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f += 1070; /* Add 10.7 MHz IF */
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write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
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}
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static int tr_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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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, "Trust FM 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 = 87500 * 16;
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v->rangehigh = 108000 * 16;
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v->flags = VIDEO_TUNER_LOW;
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v->mode = VIDEO_MODE_AUTO;
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v->signal = tr_getsigstr();
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if(tr_getstereo())
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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 = 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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tr_setfreq(*freq);
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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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VIDEO_AUDIO_BASS | VIDEO_AUDIO_TREBLE;
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v->mode = curstereo? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
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v->volume = curvol * 2048;
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v->step = 2048;
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v->bass = curbass * 4370;
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v->treble = curtreble * 4370;
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strcpy(v->name, "Trust FM 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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tr_setvol(v->volume);
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tr_setbass(v->bass);
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tr_settreble(v->treble);
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tr_setstereo(v->mode & VIDEO_SOUND_STEREO);
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tr_setmute(v->flags & VIDEO_AUDIO_MUTE);
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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 tr_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, tr_do_ioctl);
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}
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static struct file_operations trust_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 = tr_ioctl,
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.llseek = no_llseek,
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};
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static struct video_device trust_radio=
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{
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.owner = THIS_MODULE,
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.name = "Trust FM Radio",
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.type = VID_TYPE_TUNER,
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.hardware = VID_HARDWARE_TRUST,
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.fops = &trust_fops,
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};
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static int __init trust_init(void)
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{
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if(io == -1) {
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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, "Trust FM Radio")) {
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printk(KERN_ERR "trust: port 0x%x already in use\n", io);
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return -EBUSY;
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}
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if(video_register_device(&trust_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 "Trust FM Radio card driver v1.0.\n");
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write_i2c(2, TDA7318_ADDR, 0x80); /* speaker att. LF = 0 dB */
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write_i2c(2, TDA7318_ADDR, 0xa0); /* speaker att. RF = 0 dB */
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write_i2c(2, TDA7318_ADDR, 0xc0); /* speaker att. LR = 0 dB */
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write_i2c(2, TDA7318_ADDR, 0xe0); /* speaker att. RR = 0 dB */
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write_i2c(2, TDA7318_ADDR, 0x40); /* stereo 1 input, gain = 18.75 dB */
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tr_setvol(0x8000);
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tr_setbass(0x8000);
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tr_settreble(0x8000);
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tr_setstereo(1);
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/* mute card - prevents noisy bootups */
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tr_setmute(1);
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return 0;
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}
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MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
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MODULE_DESCRIPTION("A driver for the Trust FM 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 Trust FM Radio card (0x350 or 0x358)");
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module_param(radio_nr, int, 0);
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static void __exit cleanup_trust_module(void)
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{
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video_unregister_device(&trust_radio);
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release_region(io, 2);
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}
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module_init(trust_init);
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module_exit(cleanup_trust_module);
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