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acrn-kernel/drivers/media/radio/radio-maxiradio.c

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/*
* 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
*
*
* CHANGES:
* 0.75b
* - better pci interface thanks to Francois Romieu <romieu@cogenit.fr>
*
* 0.75
* - tiding up
* - removed support for multiple devices as it didn't work anyway
*
* BUGS:
* - card unmutes if you change frequency
*
*/
#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>
/* version 0.75 Sun Feb 4 22:51:27 EET 2001 */
#define DRIVER_VERSION "0.75"
#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 */
static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;
static int radio_nr = -1;
module_param(radio_nr, int, 0);
#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_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg);
static struct file_operations maxiradio_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = radio_ioctl,
.llseek = no_llseek,
};
static struct video_device maxiradio_radio =
{
.owner = THIS_MODULE,
.name = "Maxi Radio FM2000 radio",
.type = VID_TYPE_TUNER,
.hardware = VID_HARDWARE_SF16MI,
.fops = &maxiradio_fops,
};
static struct radio_device
{
__u16 io, /* base of radio io */
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 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(4);
return !(inb(io) & mo_st);
}
static int get_tune(__u16 io)
{
outb(power+clk,io); udelay(4);
return !(inb(io) & mo_st);
}
static inline int radio_function(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *dev = video_devdata(file);
struct radio_device *card=dev->priv;
switch(cmd) {
case VIDIOCGCAP: {
struct video_capability *v = arg;
memset(v,0,sizeof(*v));
strcpy(v->name, "Maxi Radio FM2000 radio");
v->type=VID_TYPE_TUNER;
v->channels=v->audios=1;
return 0;
}
case VIDIOCGTUNER: {
struct video_tuner *v = arg;
if(v->tuner)
return -EINVAL;
card->stereo = 0xffff * get_stereo(card->io);
card->tuned = 0xffff * 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;
return 0;
}
case VIDIOCSTUNER: {
struct video_tuner *v = arg;
if(v->tuner!=0)
return -EINVAL;
return 0;
}
case VIDIOCGFREQ: {
unsigned long *freq = arg;
*freq = card->freq;
return 0;
}
case VIDIOCSFREQ: {
unsigned long *freq = arg;
if (*freq < FREQ_LO || *freq > FREQ_HI)
return -EINVAL;
card->freq = *freq;
set_freq(card->io, FREQ2BITS(card->freq));
msleep(125);
return 0;
}
case VIDIOCGAUDIO: {
struct video_audio *v = arg;
memset(v,0,sizeof(*v));
strcpy(v->name, "Radio");
v->flags=VIDEO_AUDIO_MUTABLE | card->muted;
v->mode=VIDEO_SOUND_STEREO;
return 0;
}
case VIDIOCSAUDIO: {
struct video_audio *v = arg;
if(v->audio)
return -EINVAL;
card->muted = v->flags & VIDEO_AUDIO_MUTE;
if(card->muted)
turn_power(card->io, 0);
else
set_freq(card->io, FREQ2BITS(card->freq));
return 0;
}
case VIDIOCGUNIT: {
struct video_unit *v = arg;
v->video=VIDEO_NO_UNIT;
v->vbi=VIDEO_NO_UNIT;
v->radio=dev->minor;
v->audio=0;
v->teletext=VIDEO_NO_UNIT;
return 0;
}
default: return -ENOIOCTLCMD;
}
}
static int radio_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct video_device *dev = video_devdata(file);
struct radio_device *card=dev->priv;
int ret;
down(&card->lock);
ret = video_usercopy(inode, file, cmd, arg, radio_function);
up(&card->lock);
return ret;
}
MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
MODULE_LICENSE("GPL");
static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
if(!request_region(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
goto err_out;
}
if (pci_enable_device(pdev))
goto err_out_free_region;
radio_unit.io = pci_resource_start(pdev, 0);
init_MUTEX(&radio_unit.lock);
maxiradio_radio.priv = &radio_unit;
if(video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
printk("radio-maxiradio: can't register device!");
goto err_out_free_region;
}
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);
return 0;
err_out_free_region:
release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
err_out:
return -ENODEV;
}
static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
{
video_unregister_device(&maxiradio_radio);
release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
}
static struct pci_device_id maxiradio_pci_tbl[] = {
{ PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
PCI_ANY_ID, PCI_ANY_ID, },
{ 0,}
};
MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
static struct pci_driver maxiradio_driver = {
.name = "radio-maxiradio",
.id_table = maxiradio_pci_tbl,
.probe = maxiradio_init_one,
.remove = __devexit_p(maxiradio_remove_one),
};
static int __init maxiradio_radio_init(void)
{
return pci_module_init(&maxiradio_driver);
}
static void __exit maxiradio_radio_exit(void)
{
pci_unregister_driver(&maxiradio_driver);
}
module_init(maxiradio_radio_init);
module_exit(maxiradio_radio_exit);
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