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Subject[new driver] Guillemot maxi radio

Hi, this is a driver for the Guillemot Maxi Radio FM 2000 PCI radio card.
The driver was written for 2.4.0 but hopefully should work on 2.4.1
(unless ReiserFS breaks it :)

I was surprised that nobody has written a driver so far. Doesn't anybody
listen to radio anymore?

Anyway the PCI ids are missing so they are included in the source ,
probably they should go to pci.h.

#define PCI_VENDOR_ID_GUILLEMOT 0x5046
#define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001

Hope this is will be included in the next 2.4.x release.

/*
* Guillemot Maxi Radio FM 2000 PCI radio card driver for Linux
* (C) 2001 Dimitromanolakis Apostolos <apdim@grecian.net>
*
* Based in the radio Maestro PCI driver. Actually it uses the same chip
* for radio but different pci controller.
*
* I didn't have any specs I reversed engineered the protocol from
* the windows driver (radio.dll).
*
* The card uses the TEA5757 chip that includes a search function but it
* is useless as I haven't found any way to read back the frequency. If
* anybody does please mail me.
*
* For the pdf file see:
* http://www.semiconductors.philips.com/pip/TEA5757H/V1
*
*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <linux/pci.h>
#include <linux/videodev.h>

#define DRIVER_VERSION "0.7"

#ifndef PCI_VENDOR_ID_GUILLEMOT
#define PCI_VENDOR_ID_GUILLEMOT 0x5046
#endif

#ifndef PCI_DEVICE_ID_GUILLEMOT
#define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
#endif


/* TEA5757 pin mappings */
const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;


#define FREQ_LO 50*16000
#define FREQ_HI 150*16000

#define FREQ_IF 171200 /* 10.7*16000 */
#define FREQ_STEP 200 /* 12.5*16 */

#define FREQ2BITS(x) ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))\
/(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */

#define BITS2FREQ(x) ((x) * FREQ_STEP - FREQ_IF)


static int radio_open(struct video_device *, int);
static int radio_ioctl(struct video_device *, unsigned int, void *);
static void radio_close(struct video_device *);


/* if anybody knows how to find all the cards from the video_device... */
int found;
__u16 io_ports[16];

static struct video_device maxiradio_radio=
{
name: "Maxi Radio FM2000 radio",
type: VID_TYPE_TUNER,
hardware: VID_HARDWARE_SF16MI,
open: radio_open,
close: radio_close,
ioctl: radio_ioctl,
};

static struct radio_device
{
__u16 io, /* base of Maestro card radio io (GPIO_DATA)*/
muted, /* VIDEO_AUDIO_MUTE */
stereo, /* VIDEO_TUNER_STEREO_ON */
tuned; /* signal strength (0 or 0xffff) */

unsigned long freq;

struct semaphore lock;
} radio_unit = {0, 0, 0, 0, };


static void sleep_125ms(void)
{
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(HZ >> 3);
}


static void outbit(unsigned long bit, __u16 io)
{
if(bit != 0)
{
outb( power|wren|data ,io); udelay(4);
outb( power|wren|data|clk ,io); udelay(4);
outb( power|wren|data ,io); udelay(4);
}
else
{
outb( power|wren ,io); udelay(4);
outb( power|wren|clk ,io); udelay(4);
outb( power|wren ,io); udelay(4);
}
}

static void turn_power(__u16 io, int p)
{
if(p != 0) outb(power, io); else outb(0,io);
}


static void set_freq(__u16 io, __u32 data)
{
unsigned long int si;
int bl;

/* TEA5757 shift register bits (see pdf) */

outbit(0,io); // 24 search
outbit(1,io); // 23 search up/down

outbit(0,io); // 22 stereo/mono

outbit(0,io); // 21 band
outbit(0,io); // 20 band (only 00=FM works I think)

outbit(0,io); // 19 port ?
outbit(0,io); // 18 port ?

outbit(0,io); // 17 search level
outbit(0,io); // 16 search level

si = 0x8000;
for(bl = 1; bl <= 16 ; bl++) { outbit(data & si,io); si >>=1; }

outb(power,io);
}

static int get_stereo(__u16 io)
{
outb(power,io); udelay(2);
return !(inb(io) & mo_st);
}

static int get_tune(__u16 io)
{
outb(power+clk,io); udelay(2);
return !(inb(io) & mo_st);
}


inline static int radio_function(struct video_device *dev,
unsigned int cmd, void *arg)
{
struct radio_device *card=dev->priv;
switch(cmd) {
case VIDIOCGCAP: {
struct video_capability v;

strcpy(v.name, "Maxi Radio FM2000 radio");
v.type=VID_TYPE_TUNER;
v.channels=v.audios=1;
v.maxwidth=v.maxheight=v.minwidth=v.minheight=0;

if(copy_to_user(arg,&v,sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCGTUNER: {
struct video_tuner v;

if(copy_from_user(&v, arg,sizeof(v))!=0)
return -EFAULT;

if(v.tuner)
return -EINVAL;

card->stereo = get_stereo(card->io);
card->tuned = get_tune(card->io);

v.flags = VIDEO_TUNER_LOW | card->stereo;
v.signal = card->tuned;

strcpy(v.name, "FM");

v.rangelow = FREQ_LO;
v.rangehigh = FREQ_HI;
v.mode = VIDEO_MODE_AUTO;
if(copy_to_user(arg,&v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCSTUNER: {
struct video_tuner v;
if(copy_from_user(&v, arg, sizeof(v)))
return -EFAULT;
if(v.tuner!=0)
return -EINVAL;
return 0;
}
case VIDIOCGFREQ: {
unsigned long tmp=card->freq;

if(copy_to_user(arg, &tmp, sizeof(tmp)))
return -EFAULT;

return 0;
}

case VIDIOCSFREQ: {
unsigned long tmp;

if(copy_from_user(&tmp, arg, sizeof(tmp)))
return -EFAULT;

if ( tmp<FREQ_LO || tmp>FREQ_HI )
return -EINVAL;

set_freq(card->io, FREQ2BITS(tmp));
sleep_125ms();

return 0;
}
case VIDIOCGAUDIO: {
struct video_audio v;
strcpy(v.name, "Radio");
v.audio=v.volume=v.bass=v.treble=v.balance=v.step=0;
v.flags=VIDEO_AUDIO_MUTABLE | card->muted;
v.mode=VIDEO_SOUND_STEREO;
if(copy_to_user(arg,&v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCSAUDIO: {
struct video_audio v;

if(copy_from_user(&v, arg, sizeof(v)))
return -EFAULT;

if(v.audio)
return -EINVAL;

{
card->muted = v.flags & VIDEO_AUDIO_MUTE;

if(card->muted) turn_power(card->io, 0); else turn_power(card->io, 1);

return 0;
}
}
case VIDIOCGUNIT: {
struct video_unit v;
v.video=VIDEO_NO_UNIT;
v.vbi=VIDEO_NO_UNIT;
v.radio=dev->minor;
v.audio=0;
v.teletext=VIDEO_NO_UNIT;
if(copy_to_user(arg, &v, sizeof(v)))
return -EFAULT;
return 0;
}
default: return -ENOIOCTLCMD;
}
}

static int radio_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
{
struct radio_device *card=dev->priv;
int ret;
down(&card->lock);
ret = radio_function(dev, cmd, arg);
up(&card->lock);
return ret;
}

static int radio_open(struct video_device *dev, int flags)
{
MOD_INC_USE_COUNT;
return 0;
}

static void radio_close(struct video_device *dev)
{
MOD_DEC_USE_COUNT;
}


inline static __u16 radio_install(struct pci_dev *pcidev);

MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");

EXPORT_NO_SYMBOLS;

void __exit maxiradio_radio_exit(void)
{
int k;

video_unregister_device(&maxiradio_radio);

for(k=0;k<found;k++) release_region(io_ports[k],4);
}

int __init maxiradio_radio_init(void)
{
struct pci_dev *pcidev = NULL;
if(!pci_present())
return -ENODEV;

found = 0;

while((pcidev = pci_find_device(PCI_VENDOR_ID_GUILLEMOT,
PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
pcidev)))
found += radio_install(pcidev);

if(found == 0) {
printk(KERN_INFO "radio-maxiradio: no devices found.\n");
return -ENODEV;
}

printk(KERN_INFO "radio-maxiradio: %d device(s) found.\n",found);
return 0;
}

module_init(maxiradio_radio_init);
module_exit(maxiradio_radio_exit);

inline static __u16 radio_install(struct pci_dev *pcidev)
{
radio_unit.io = pcidev->resource[0].start;

pci_enable_device(pcidev);
maxiradio_radio.priv = &radio_unit;
init_MUTEX(&radio_unit.lock);

if(video_register_device(&maxiradio_radio, VFL_TYPE_RADIO)==-1) {
printk("radio-maxiradio: can't register device!");
return 0;
}


printk(KERN_INFO "radio-maxiradio: version "
DRIVER_VERSION
" time "
__TIME__ " "
__DATE__
"\n");

printk(KERN_INFO
"radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
radio_unit.io
);


if(!request_region(radio_unit.io, 4, "Maxi Radio FM 2000"))
{
printk(KERN_ERR "radio-maxiradio: port 0x%x already in use\n",
radio_unit.io);

return 0;
}

io_ports[found] = radio_unit.io;

return 1;
}

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