350 lines
8.1 KiB
C
350 lines
8.1 KiB
C
/*
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* Guillemot Maxi Radio FM 2000 PCI radio card driver for Linux
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* (C) 2001 Dimitromanolakis Apostolos <apdim@grecian.net>
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*
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* Based in the radio Maestro PCI driver. Actually it uses the same chip
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* for radio but different pci controller.
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*
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* I didn't have any specs I reversed engineered the protocol from
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* the windows driver (radio.dll).
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*
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* The card uses the TEA5757 chip that includes a search function but it
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* is useless as I haven't found any way to read back the frequency. If
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* anybody does please mail me.
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*
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* For the pdf file see:
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* http://www.semiconductors.philips.com/pip/TEA5757H/V1
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*
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*
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* CHANGES:
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* 0.75b
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* - better pci interface thanks to Francois Romieu <romieu@cogenit.fr>
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*
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* 0.75
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* - tiding up
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* - removed support for multiple devices as it didn't work anyway
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*
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* BUGS:
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* - card unmutes if you change frequency
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*
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*/
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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 <linux/delay.h>
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#include <linux/sched.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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#include <linux/pci.h>
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#include <linux/videodev.h>
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/* version 0.75 Sun Feb 4 22:51:27 EET 2001 */
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#define DRIVER_VERSION "0.75"
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#ifndef PCI_VENDOR_ID_GUILLEMOT
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#define PCI_VENDOR_ID_GUILLEMOT 0x5046
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#endif
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#ifndef PCI_DEVICE_ID_GUILLEMOT
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#define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
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#endif
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/* TEA5757 pin mappings */
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static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;
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static int radio_nr = -1;
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module_param(radio_nr, int, 0);
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#define FREQ_LO 50*16000
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#define FREQ_HI 150*16000
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#define FREQ_IF 171200 /* 10.7*16000 */
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#define FREQ_STEP 200 /* 12.5*16 */
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#define FREQ2BITS(x) ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))\
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/(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */
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#define BITS2FREQ(x) ((x) * FREQ_STEP - FREQ_IF)
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static int radio_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg);
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static struct file_operations maxiradio_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 = radio_ioctl,
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.llseek = no_llseek,
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};
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static struct video_device maxiradio_radio =
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{
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.owner = THIS_MODULE,
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.name = "Maxi Radio FM2000 radio",
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.type = VID_TYPE_TUNER,
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.hardware = VID_HARDWARE_SF16MI,
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.fops = &maxiradio_fops,
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};
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static struct radio_device
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{
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__u16 io, /* base of radio io */
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muted, /* VIDEO_AUDIO_MUTE */
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stereo, /* VIDEO_TUNER_STEREO_ON */
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tuned; /* signal strength (0 or 0xffff) */
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unsigned long freq;
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struct semaphore lock;
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} radio_unit = {0, 0, 0, 0, };
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static void outbit(unsigned long bit, __u16 io)
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{
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if(bit != 0)
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{
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outb( power|wren|data ,io); udelay(4);
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outb( power|wren|data|clk ,io); udelay(4);
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outb( power|wren|data ,io); udelay(4);
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}
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else
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{
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outb( power|wren ,io); udelay(4);
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outb( power|wren|clk ,io); udelay(4);
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outb( power|wren ,io); udelay(4);
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}
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}
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static void turn_power(__u16 io, int p)
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{
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if(p != 0) outb(power, io); else outb(0,io);
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}
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static void set_freq(__u16 io, __u32 data)
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{
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unsigned long int si;
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int bl;
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/* TEA5757 shift register bits (see pdf) */
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outbit(0,io); // 24 search
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outbit(1,io); // 23 search up/down
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outbit(0,io); // 22 stereo/mono
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outbit(0,io); // 21 band
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outbit(0,io); // 20 band (only 00=FM works I think)
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outbit(0,io); // 19 port ?
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outbit(0,io); // 18 port ?
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outbit(0,io); // 17 search level
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outbit(0,io); // 16 search level
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si = 0x8000;
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for(bl = 1; bl <= 16 ; bl++) { outbit(data & si,io); si >>=1; }
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outb(power,io);
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}
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static int get_stereo(__u16 io)
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{
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outb(power,io); udelay(4);
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return !(inb(io) & mo_st);
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}
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static int get_tune(__u16 io)
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{
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outb(power+clk,io); udelay(4);
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return !(inb(io) & mo_st);
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}
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static inline int radio_function(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 radio_device *card=dev->priv;
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switch(cmd) {
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case VIDIOCGCAP: {
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struct video_capability *v = arg;
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memset(v,0,sizeof(*v));
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strcpy(v->name, "Maxi Radio FM2000 radio");
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v->type=VID_TYPE_TUNER;
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v->channels=v->audios=1;
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return 0;
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}
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case VIDIOCGTUNER: {
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struct video_tuner *v = arg;
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if(v->tuner)
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return -EINVAL;
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card->stereo = 0xffff * get_stereo(card->io);
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card->tuned = 0xffff * get_tune(card->io);
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v->flags = VIDEO_TUNER_LOW | card->stereo;
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v->signal = card->tuned;
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strcpy(v->name, "FM");
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v->rangelow = FREQ_LO;
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v->rangehigh = FREQ_HI;
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v->mode = VIDEO_MODE_AUTO;
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return 0;
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}
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case VIDIOCSTUNER: {
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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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unsigned long *freq = arg;
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*freq = card->freq;
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return 0;
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}
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case VIDIOCSFREQ: {
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unsigned long *freq = arg;
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if (*freq < FREQ_LO || *freq > FREQ_HI)
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return -EINVAL;
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card->freq = *freq;
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set_freq(card->io, FREQ2BITS(card->freq));
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msleep(125);
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return 0;
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}
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case VIDIOCGAUDIO: {
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struct video_audio *v = arg;
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memset(v,0,sizeof(*v));
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strcpy(v->name, "Radio");
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v->flags=VIDEO_AUDIO_MUTABLE | card->muted;
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v->mode=VIDEO_SOUND_STEREO;
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return 0;
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}
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case VIDIOCSAUDIO: {
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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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card->muted = v->flags & VIDEO_AUDIO_MUTE;
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if(card->muted)
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turn_power(card->io, 0);
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else
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set_freq(card->io, FREQ2BITS(card->freq));
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return 0;
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}
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case VIDIOCGUNIT: {
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struct video_unit *v = arg;
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v->video=VIDEO_NO_UNIT;
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v->vbi=VIDEO_NO_UNIT;
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v->radio=dev->minor;
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v->audio=0;
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v->teletext=VIDEO_NO_UNIT;
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return 0;
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}
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default: return -ENOIOCTLCMD;
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}
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}
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static int radio_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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struct video_device *dev = video_devdata(file);
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struct radio_device *card=dev->priv;
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int ret;
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down(&card->lock);
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ret = video_usercopy(inode, file, cmd, arg, radio_function);
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up(&card->lock);
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return ret;
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}
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MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
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MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
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MODULE_LICENSE("GPL");
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static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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if(!request_region(pci_resource_start(pdev, 0),
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pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
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printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
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goto err_out;
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}
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if (pci_enable_device(pdev))
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goto err_out_free_region;
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radio_unit.io = pci_resource_start(pdev, 0);
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init_MUTEX(&radio_unit.lock);
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maxiradio_radio.priv = &radio_unit;
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if(video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
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printk("radio-maxiradio: can't register device!");
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goto err_out_free_region;
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}
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printk(KERN_INFO "radio-maxiradio: version "
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DRIVER_VERSION
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" time "
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__TIME__ " "
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__DATE__
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"\n");
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printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
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radio_unit.io);
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return 0;
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err_out_free_region:
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release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
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err_out:
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return -ENODEV;
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}
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static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
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{
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video_unregister_device(&maxiradio_radio);
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release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
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}
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static struct pci_device_id maxiradio_pci_tbl[] = {
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{ PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
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PCI_ANY_ID, PCI_ANY_ID, },
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{ 0,}
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};
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MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
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static struct pci_driver maxiradio_driver = {
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.name = "radio-maxiradio",
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.id_table = maxiradio_pci_tbl,
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.probe = maxiradio_init_one,
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.remove = __devexit_p(maxiradio_remove_one),
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};
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static int __init maxiradio_radio_init(void)
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{
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return pci_module_init(&maxiradio_driver);
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}
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static void __exit maxiradio_radio_exit(void)
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{
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pci_unregister_driver(&maxiradio_driver);
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}
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module_init(maxiradio_radio_init);
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module_exit(maxiradio_radio_exit);
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