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/* 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 <linux/mutex.h>
#include <linux/pci.h>
#include <linux/videodev.h>
#define DRIVER_VERSION "0.05"
#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_param(radio_nr, int, 0);
static int radio_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg);
static int maestro_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
static void maestro_remove(struct pci_dev *pdev);
static struct pci_device_id maestro_r_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_ESS1968),
.class = PCI_CLASS_MULTIMEDIA_AUDIO << 8,
.class_mask = 0xffff00 },
{ PCI_DEVICE(PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_ESS1978),
.class = PCI_CLASS_MULTIMEDIA_AUDIO << 8,
.class_mask = 0xffff00 },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, maestro_r_pci_tbl);
static struct pci_driver maestro_r_driver = {
.name = "maestro_radio",
.id_table = maestro_r_pci_tbl,
.probe = maestro_probe,
.remove = __devexit_p(maestro_remove),
};
static struct file_operations maestro_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = radio_ioctl,
.compat_ioctl = v4l_compat_ioctl32,
.llseek = no_llseek,
};
static struct video_device maestro_radio = {
.name = "Maestro radio",
.type = VID_TYPE_TUNER,
.hardware = VID_HARDWARE_SF16MI,
.fops = &maestro_fops,
};
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 mutex lock;
};
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);
udelay(16);
for (l=24;l--;) {
outw(STR_CLK, io); /* HI state */
udelay(2);
if(!l)
dev->tuned = inw(io) & STR_MOST ? 0 : 0xffff;
outw(0, io); /* LO state */
udelay(2);
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++;
udelay(2);
}
if(dev->muted)
outw(STR_WREN, io);
udelay(4);
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);
udelay(16);
for (l=25;l;l--) {
bits = ((data >> 18) & STR_DATA) | STR_WREN ;
data <<= 1; /* shift data */
outw(bits, io); /* start strobe */
udelay(2);
outw(bits | STR_CLK, io); /* HI level */
udelay(2);
outw(bits, io); /* LO level */
udelay(4);
}
if(!dev->muted)
outw(0, io);
udelay(4);
outw(omask, io + IO_MASK);
outw(odir, io + IO_DIR);
msleep(125);
}
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 = video_get_drvdata(dev);
switch (cmd) {
case VIDIOCGCAP: {
struct video_capability *v = arg;
memset(v, 0, sizeof(*v));
strcpy(v->name, "Maestro 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;
(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;
return 0;
} case VIDIOCSTUNER: {
struct video_tuner *v = arg;
if (v->tuner != 0)
return -EINVAL;
return 0;
} case VIDIOCGFREQ: {
unsigned long *freq = arg;
*freq = BITS2FREQ(radio_bits_get(card));
return 0;
} case VIDIOCSFREQ: {
unsigned long *freq = arg;
if (*freq < FREQ_LO || *freq > FREQ_HI)
return -EINVAL;
radio_bits_set(card, FREQ2BITS(*freq));
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;
{
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);
udelay(4);
outw(omask, io + IO_MASK);
msleep(125);
return 0;
}
} case
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