Viewing file:  radio-maestro.c (9.26 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* Maestro PCI sound card radio driver for Linux support
* (c) 2000 A. Tlalka, atlka@pg.gda.pl
* Notes on the hardware
*
* + Frequency control is done digitally
* + No volume control - only mute/unmute - you have to use Aux line volume
* control on Maestro card to set the volume
* + Radio status (tuned/not_tuned and stereo/mono) is valid some time after
* frequency setting (>100ms) and only when the radio is unmuted.
* version 0.02
* + io port is automatically detected - only the first radio is used
* version 0.03
* + thread access locking additions
* version 0.04
* + code improvements
* + VIDEO_TUNER_LOW is permanent
*/
#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 "0.04"
#define PCI_VENDOR_ESS 0x125D
#define PCI_DEVICE_ID_ESS_ESS1968 0x1968 /* Maestro 2 */
#define PCI_DEVICE_ID_ESS_ESS1978 0x1978 /* Maestro 2E */
#define GPIO_DATA 0x60 /* port offset from ESS_IO_BASE */
#define IO_MASK 4 /* mask register offset from GPIO_DATA
bits 1=unmask write to given bit */
#define IO_DIR 8 /* direction register offset from GPIO_DATA
bits 0/1=read/write direction */
#define GPIO6 0x0040 /* mask bits for GPIO lines */
#define GPIO7 0x0080
#define GPIO8 0x0100
#define GPIO9 0x0200
#define STR_DATA GPIO6 /* radio TEA5757 pins and GPIO bits */
#define STR_CLK GPIO7
#define STR_WREN GPIO8
#define STR_MOST GPIO9
#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_nr = -1;
MODULE_PARM(radio_nr, "i");
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 *);
static struct video_device maestro_radio=
{
owner: THIS_MODULE,
name: "Maestro 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) */
struct semaphore lock;
} radio_unit = {0, 0, 0, 0, };
static int users = 0;
static void sleep_125ms(void)
{
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(HZ >> 3);
}
static void udelay2(void)
{
udelay(2);
}
static void udelay4(void)
{
udelay(4);
}
static void udelay16(void)
{
udelay(16);
}
static __u32 radio_bits_get(struct radio_device *dev)
{
register __u16 io=dev->io, l, rdata;
register __u32 data=0;
__u16 omask;
omask = inw(io + IO_MASK);
outw(~(STR_CLK | STR_WREN), io + IO_MASK);
outw(0, io);
udelay16();
for (l=24;l--;) {
outw(STR_CLK, io); /* HI state */
udelay2();
if(!l)
dev->tuned = inw(io) & STR_MOST ? 0 : 0xffff;
outw(0, io); /* LO state */
udelay2();
data <<= 1; /* shift data */
rdata = inw(io);
if(!l)
dev->stereo = rdata & STR_MOST ?
0 : VIDEO_TUNER_STEREO_ON;
else
if(rdata & STR_DATA)
data++;
udelay2();
}
if(dev->muted)
outw(STR_WREN, io);
udelay4();
outw(omask, io + IO_MASK);
return data & 0x3ffe;
}
static void radio_bits_set(struct radio_device *dev, __u32 data)
{
register __u16 io=dev->io, l, bits;
__u16 omask, odir;
omask = inw(io + IO_MASK);
odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN);
outw(odir | STR_DATA, io + IO_DIR);
outw(~(STR_DATA | STR_CLK | STR_WREN), io + IO_MASK);
udelay16();
for (l=25;l;l--) {
bits = ((data >> 18) & STR_DATA) | STR_WREN ;
data <<= 1; /* shift data */
outw(bits, io); /* start strobe */
udelay2();
outw(bits | STR_CLK, io); /* HI level */
udelay2();
outw(bits, io); /* LO level */
udelay4();
}
if(!dev->muted)
outw(0, io);
udelay4();
outw(omask, io + IO_MASK);
outw(odir, io + IO_DIR);
sleep_125ms();
}
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, "Maestro 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;
(void)radio_bits_get(card);
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=BITS2FREQ(radio_bits_get(card));
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;
radio_bits_set(card, FREQ2BITS(tmp));
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;
{
register __u16 io=card->io;
register __u16 omask = inw(io + IO_MASK);
outw(~STR_WREN, io + IO_MASK);
outw((card->muted = v.flags & VIDEO_AUDIO_MUTE)
? STR_WREN : 0, io);
udelay4();
outw(omask, io + IO_MASK);
sleep_125ms();
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)
{
if(users)
return -EBUSY;
users++;
return 0;
}
static void radio_close(struct video_device *dev)
{
users--;
}
inline static __u16 radio_install(struct pci_dev *pcidev);
MODULE_AUTHOR("Adam Tlalka, atlka@pg.gda.pl");
MODULE_DESCRIPTION("Radio driver for the Maestro PCI sound card radio.");
MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;
void __exit maestro_radio_exit(void)
{
video_unregister_device(&maestro_radio);
}
int __init maestro_radio_init(void)
{
register __u16 found=0;
struct pci_dev *pcidev = NULL;
if(!pci_present())
return -ENODEV;
while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS,
PCI_DEVICE_ID_ESS_ESS1968,
pcidev)))
found |= radio_install(pcidev);
while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS,
PCI_DEVICE_ID_ESS_ESS1978,
pcidev)))
found |= radio_install(pcidev);
if(!found) {
printk(KERN_INFO "radio-maestro: no devices found.\n");
return -ENODEV;
}
return 0;
}
module_init(maestro_radio_init);
module_exit(maestro_radio_exit);
inline static __u16 radio_power_on(struct radio_device *dev)
{
register __u16 io=dev->io;
register __u32 ofreq;
__u16 omask, odir;
omask = inw(io + IO_MASK);
odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN);
outw(odir & ~STR_WREN, io + IO_DIR);
dev->muted = inw(io) & STR_WREN ? 0 : VIDEO_AUDIO_MUTE;
outw(odir, io + IO_DIR);
outw(~(STR_WREN | STR_CLK), io + IO_MASK);
outw(dev->muted ? 0 : STR_WREN, io);
udelay16();
outw(omask, io + IO_MASK);
ofreq = radio_bits_get(dev);
if((ofreq<FREQ2BITS(FREQ_LO)) || (ofreq>FREQ2BITS(FREQ_HI)))
ofreq = FREQ2BITS(FREQ_LO);
radio_bits_set(dev, ofreq);
return (ofreq == radio_bits_get(dev));
}
inline static __u16 radio_install(struct pci_dev *pcidev)
{
if(((pcidev->class >> 8) & 0xffff) != PCI_CLASS_MULTIMEDIA_AUDIO)
return 0;
radio_unit.io = pcidev->resource[0].start + GPIO_DATA;
maestro_radio.priv = &radio_unit;
init_MUTEX(&radio_unit.lock);
if(radio_power_on(&radio_unit)) {
if(video_register_device(&maestro_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
printk("radio-maestro: can't register device!");
return 0;
}
printk(KERN_INFO "radio-maestro: version "
DRIVER_VERSION
" time "
__TIME__ " "
__DATE__
"\n");
printk(KERN_INFO "radio-maestro: radio chip initialized\n");
return 1;
} else
return 0;
}
|