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

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/* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
*
* GemTek hasn't released any specs on the card, so the protocol had to
* be reverse engineered with dosemu.
*
* Besides the protocol changes, this is mostly a copy of:
*
* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
*
* Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
* Converted to new API by Alan Cox <Alan.Cox@linux.org>
* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
*
* TODO: Allow for more than one of these foolish entities :-)
*
* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* request_region */
#include <linux/delay.h> /* udelay */
#include <asm/io.h> /* outb, outb_p */
#include <asm/uaccess.h> /* copy to/from user */
#include <linux/videodev2.h> /* kernel radio structs */
#include <media/v4l2-common.h>
#include <linux/spinlock.h>
#include <linux/version.h> /* for KERNEL_VERSION MACRO */
#define RADIO_VERSION KERNEL_VERSION(0,0,3)
#define RADIO_BANNER "GemTek Radio card driver: v0.0.3"
/*
* Module info.
*/
MODULE_AUTHOR("Jonas Munsin, Pekka Seppänen <pexu@kapsi.fi>");
MODULE_DESCRIPTION("A driver for the GemTek Radio card.");
MODULE_LICENSE("GPL");
/*
* Module params.
*/
#ifndef CONFIG_RADIO_GEMTEK_PORT
#define CONFIG_RADIO_GEMTEK_PORT -1
#endif
#ifndef CONFIG_RADIO_GEMTEK_PROBE
#define CONFIG_RADIO_GEMTEK_PROBE 1
#endif
static int io = CONFIG_RADIO_GEMTEK_PORT;
static int probe = CONFIG_RADIO_GEMTEK_PROBE;
static int hardmute;
static int shutdown = 1;
static int keepmuted = 1;
static int initmute = 1;
static int radio_nr = -1;
module_param(io, int, 0444);
MODULE_PARM_DESC(io, "Force I/O port for the GemTek Radio card if automatic "
"probing is disabled or fails. The most common I/O ports are: 0x20c "
"0x30c, 0x24c or 0x34c (0x20c, 0x248 and 0x28c have been reported to "
"work for the combined sound/radiocard).");
module_param(probe, bool, 0444);
MODULE_PARM_DESC(probe, "Enable automatic device probing. Note: only the most "
"common I/O ports used by the card are probed.");
module_param(hardmute, bool, 0644);
MODULE_PARM_DESC(hardmute, "Enable `hard muting' by shutting down PLL, may "
"reduce static noise.");
module_param(shutdown, bool, 0644);
MODULE_PARM_DESC(shutdown, "Enable shutting down PLL and muting line when "
"module is unloaded.");
module_param(keepmuted, bool, 0644);
MODULE_PARM_DESC(keepmuted, "Keep card muted even when frequency is changed.");
module_param(initmute, bool, 0444);
MODULE_PARM_DESC(initmute, "Mute card when module is loaded.");
module_param(radio_nr, int, 0444);
/*
* Functions for controlling the card.
*/
#define GEMTEK_LOWFREQ (87*16000)
#define GEMTEK_HIGHFREQ (108*16000)
/*
* Frequency calculation constants. Intermediate frequency 10.52 MHz (nominal
* value 10.7 MHz), reference divisor 6.39 kHz (nominal 6.25 kHz).
*/
#define FSCALE 8
#define IF_OFFSET ((unsigned int)(10.52 * 16000 * (1<<FSCALE)))
#define REF_FREQ ((unsigned int)(6.39 * 16 * (1<<FSCALE)))
#define GEMTEK_CK 0x01 /* Clock signal */
#define GEMTEK_DA 0x02 /* Serial data */
#define GEMTEK_CE 0x04 /* Chip enable */
#define GEMTEK_NS 0x08 /* No signal */
#define GEMTEK_MT 0x10 /* Line mute */
#define GEMTEK_STDF_3_125_KHZ 0x01 /* Standard frequency 3.125 kHz */
#define GEMTEK_PLL_OFF 0x07 /* PLL off */
#define BU2614_BUS_SIZE 32 /* BU2614 / BU2614FS bus size */
#define SHORT_DELAY 5 /* usec */
#define LONG_DELAY 75 /* usec */
struct gemtek_device {
unsigned long lastfreq;
int muted;
u32 bu2614data;
};
#define BU2614_FREQ_BITS 16 /* D0..D15, Frequency data */
#define BU2614_PORT_BITS 3 /* P0..P2, Output port control data */
#define BU2614_VOID_BITS 4 /* unused */
#define BU2614_FMES_BITS 1 /* CT, Frequency measurement beginning data */
#define BU2614_STDF_BITS 3 /* R0..R2, Standard frequency data */
#define BU2614_SWIN_BITS 1 /* S, Switch between FMIN / AMIN */
#define BU2614_SWAL_BITS 1 /* PS, Swallow counter division (AMIN only)*/
#define BU2614_VOID2_BITS 1 /* unused */
#define BU2614_FMUN_BITS 1 /* GT, Frequency measurement time & unlock */
#define BU2614_TEST_BITS 1 /* TS, Test data is input */
#define BU2614_FREQ_SHIFT 0
#define BU2614_PORT_SHIFT (BU2614_FREQ_BITS + BU2614_FREQ_SHIFT)
#define BU2614_VOID_SHIFT (BU2614_PORT_BITS + BU2614_PORT_SHIFT)
#define BU2614_FMES_SHIFT (BU2614_VOID_BITS + BU2614_VOID_SHIFT)
#define BU2614_STDF_SHIFT (BU2614_FMES_BITS + BU2614_FMES_SHIFT)
#define BU2614_SWIN_SHIFT (BU2614_STDF_BITS + BU2614_STDF_SHIFT)
#define BU2614_SWAL_SHIFT (BU2614_SWIN_BITS + BU2614_SWIN_SHIFT)
#define BU2614_VOID2_SHIFT (BU2614_SWAL_BITS + BU2614_SWAL_SHIFT)
#define BU2614_FMUN_SHIFT (BU2614_VOID2_BITS + BU2614_VOID2_SHIFT)
#define BU2614_TEST_SHIFT (BU2614_FMUN_BITS + BU2614_FMUN_SHIFT)
#define MKMASK(field) (((1<<BU2614_##field##_BITS) - 1) << \
BU2614_##field##_SHIFT)
#define BU2614_PORT_MASK MKMASK(PORT)
#define BU2614_FREQ_MASK MKMASK(FREQ)
#define BU2614_VOID_MASK MKMASK(VOID)
#define BU2614_FMES_MASK MKMASK(FMES)
#define BU2614_STDF_MASK MKMASK(STDF)
#define BU2614_SWIN_MASK MKMASK(SWIN)
#define BU2614_SWAL_MASK MKMASK(SWAL)
#define BU2614_VOID2_MASK MKMASK(VOID2)
#define BU2614_FMUN_MASK MKMASK(FMUN)
#define BU2614_TEST_MASK MKMASK(TEST)
static struct gemtek_device gemtek_unit;
static spinlock_t lock;
/*
* Set data which will be sent to BU2614FS.
*/
#define gemtek_bu2614_set(dev, field, data) ((dev)->bu2614data = \
((dev)->bu2614data & ~field##_MASK) | ((data) << field##_SHIFT))
/*
* Transmit settings to BU2614FS over GemTek IC.
*/
static void gemtek_bu2614_transmit(struct gemtek_device *dev)
{
int i, bit, q, mute;
spin_lock(&lock);
mute = dev->muted ? GEMTEK_MT : 0x00;
outb_p(mute | GEMTEK_DA | GEMTEK_CK, io);
udelay(SHORT_DELAY);
outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, io);
udelay(LONG_DELAY);
for (i = 0, q = dev->bu2614data; i < 32; i++, q >>= 1) {
bit = (q & 1) ? GEMTEK_DA : 0;
outb_p(mute | GEMTEK_CE | bit, io);
udelay(SHORT_DELAY);
outb_p(mute | GEMTEK_CE | bit | GEMTEK_CK, io);
udelay(SHORT_DELAY);
}
outb_p(mute | GEMTEK_DA | GEMTEK_CK, io);
udelay(SHORT_DELAY);
outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, io);
udelay(LONG_DELAY);
spin_unlock(&lock);
}
/*
* Calculate divisor from FM-frequency for BU2614FS (3.125 KHz STDF expected).
*/
static unsigned long gemtek_convfreq(unsigned long freq)
{
return ((freq<<FSCALE) + IF_OFFSET + REF_FREQ/2) / REF_FREQ;
}
/*
* Set FM-frequency.
*/
static void gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
{
if (keepmuted && hardmute && dev->muted)
return;
if (freq < GEMTEK_LOWFREQ)
freq = GEMTEK_LOWFREQ;
else if (freq > GEMTEK_HIGHFREQ)
freq = GEMTEK_HIGHFREQ;
dev->lastfreq = freq;
dev->muted = 0;
gemtek_bu2614_set(dev, BU2614_PORT, 0);
gemtek_bu2614_set(dev, BU2614_FMES, 0);
gemtek_bu2614_set(dev, BU2614_SWIN, 0); /* FM-mode */
gemtek_bu2614_set(dev, BU2614_SWAL, 0);
gemtek_bu2614_set(dev, BU2614_FMUN, 1); /* GT bit set */
gemtek_bu2614_set(dev, BU2614_TEST, 0);
gemtek_bu2614_set(dev, BU2614_STDF, GEMTEK_STDF_3_125_KHZ);
gemtek_bu2614_set(dev, BU2614_FREQ, gemtek_convfreq(freq));
gemtek_bu2614_transmit(dev);
}
/*
* Set mute flag.
*/
static void gemtek_mute(struct gemtek_device *dev)
{
int i;
dev->muted = 1;
if (hardmute) {
/* Turn off PLL, disable data output */
gemtek_bu2614_set(dev, BU2614_PORT, 0);
gemtek_bu2614_set(dev, BU2614_FMES, 0); /* CT bit off */
gemtek_bu2614_set(dev, BU2614_SWIN, 0); /* FM-mode */
gemtek_bu2614_set(dev, BU2614_SWAL, 0);
gemtek_bu2614_set(dev, BU2614_FMUN, 0); /* GT bit off */
gemtek_bu2614_set(dev, BU2614_TEST, 0);
gemtek_bu2614_set(dev, BU2614_STDF, GEMTEK_PLL_OFF);
gemtek_bu2614_set(dev, BU2614_FREQ, 0);
gemtek_bu2614_transmit(dev);
} else {
spin_lock(&lock);
/* Read bus contents (CE, CK and DA). */
i = inb_p(io);
/* Write it back with mute flag set. */
outb_p((i >> 5) | GEMTEK_MT, io);
udelay(SHORT_DELAY);
spin_unlock(&lock);
}
}
/*
* Unset mute flag.
*/
static void gemtek_unmute(struct gemtek_device *dev)
{
int i;
dev->muted = 0;
if (hardmute) {
/* Turn PLL back on. */
gemtek_setfreq(dev, dev->lastfreq);
} else {
spin_lock(&lock);
i = inb_p(io);
outb_p(i >> 5, io);
udelay(SHORT_DELAY);
spin_unlock(&lock);
}
}
/*
* Get signal strength (= stereo status).
*/
static inline int gemtek_getsigstr(void)
{
return inb_p(io) & GEMTEK_NS ? 0 : 1;
}
/*
* Check if requested card acts like GemTek Radio card.
*/
static int gemtek_verify(int port)
{
static int verified = -1;
int i, q;
if (verified == port)
return 1;
spin_lock(&lock);
q = inb_p(port); /* Read bus contents before probing. */
/* Try to turn on CE, CK and DA respectively and check if card responds
properly. */
for (i = 0; i < 3; ++i) {
outb_p(1 << i, port);
udelay(SHORT_DELAY);
if ((inb_p(port) & (~GEMTEK_NS)) != (0x17 | (1 << (i + 5)))) {
spin_unlock(&lock);
return 0;
}
}
outb_p(q >> 5, port); /* Write bus contents back. */
udelay(SHORT_DELAY);
spin_unlock(&lock);
verified = port;
return 1;
}
/*
* Automatic probing for card.
*/
static int gemtek_probe(void)
{
int ioports[] = { 0x20c, 0x30c, 0x24c, 0x34c, 0x248, 0x28c };
int i;
if (!probe) {
printk(KERN_INFO "Automatic device probing disabled.\n");
return -1;
}
printk(KERN_INFO "Automatic device probing enabled.\n");
for (i = 0; i < ARRAY_SIZE(ioports); ++i) {
printk(KERN_INFO "Trying I/O port 0x%x...\n", ioports[i]);
if (!request_region(ioports[i], 1, "gemtek-probe")) {
printk(KERN_WARNING "I/O port 0x%x busy!\n",
ioports[i]);
continue;
}
if (gemtek_verify(ioports[i])) {
printk(KERN_INFO "Card found from I/O port "
"0x%x!\n", ioports[i]);
release_region(ioports[i], 1);
io = ioports[i];
return io;
}
release_region(ioports[i], 1);
}
printk(KERN_ERR "Automatic probing failed!\n");
return -1;
}
/*
* Video 4 Linux stuff.
*/
static struct v4l2_queryctrl radio_qctrl[] = {
{
.id = V4L2_CID_AUDIO_MUTE,
.name = "Mute",
.minimum = 0,
.maximum = 1,
.default_value = 1,
.type = V4L2_CTRL_TYPE_BOOLEAN,
}, {
.id = V4L2_CID_AUDIO_VOLUME,
.name = "Volume",
.minimum = 0,
.maximum = 65535,
.step = 65535,
.default_value = 0xff,
.type = V4L2_CTRL_TYPE_INTEGER,
}
};
static const struct file_operations gemtek_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = video_ioctl2,
.compat_ioctl = v4l_compat_ioctl32,
.llseek = no_llseek
};
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
strlcpy(v->driver, "radio-gemtek", sizeof(v->driver));
strlcpy(v->card, "GemTek", sizeof(v->card));
sprintf(v->bus_info, "ISA");
v->version = RADIO_VERSION;
v->capabilities = V4L2_CAP_TUNER;
return 0;
}
static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
{
if (v->index > 0)
return -EINVAL;
strcpy(v->name, "FM");
v->type = V4L2_TUNER_RADIO;
v->rangelow = GEMTEK_LOWFREQ;
v->rangehigh = GEMTEK_HIGHFREQ;
v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
v->signal = 0xffff * gemtek_getsigstr();
if (v->signal) {
v->audmode = V4L2_TUNER_MODE_STEREO;
v->rxsubchans = V4L2_TUNER_SUB_STEREO;
} else {
v->audmode = V4L2_TUNER_MODE_MONO;
v->rxsubchans = V4L2_TUNER_SUB_MONO;
}
return 0;
}
static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
{
if (v->index > 0)
return -EINVAL;
return 0;
}
static int vidioc_s_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct video_device *dev = video_devdata(file);
struct gemtek_device *rt = dev->priv;
gemtek_setfreq(rt, f->frequency);
return 0;
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct video_device *dev = video_devdata(file);
struct gemtek_device *rt = dev->priv;
f->type = V4L2_TUNER_RADIO;
f->frequency = rt->lastfreq;
return 0;
}
static int vidioc_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
int i;
for (i = 0; i < ARRAY_SIZE(radio_qctrl); ++i) {
if (qc->id && qc->id == radio_qctrl[i].id) {
memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
return 0;
}
}
return -EINVAL;
}
static int vidioc_g_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct video_device *dev = video_devdata(file);
struct gemtek_device *rt = dev->priv;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
ctrl->value = rt->muted;
return 0;
case V4L2_CID_AUDIO_VOLUME:
if (rt->muted)
ctrl->value = 0;
else
ctrl->value = 65535;
return 0;
}
return -EINVAL;
}
static int vidioc_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct video_device *dev = video_devdata(file);
struct gemtek_device *rt = dev->priv;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
if (ctrl->value)
gemtek_mute(rt);
else
gemtek_unmute(rt);
return 0;
case V4L2_CID_AUDIO_VOLUME:
if (ctrl->value)
gemtek_unmute(rt);
else
gemtek_mute(rt);
return 0;
}
return -EINVAL;
}
static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
{
if (a->index > 1)
return -EINVAL;
strcpy(a->name, "Radio");
a->capability = V4L2_AUDCAP_STEREO;
return 0;
}
static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
*i = 0;
return 0;
}
static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
if (i != 0)
return -EINVAL;
return 0;
}
static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
{
if (a->index != 0)
return -EINVAL;
return 0;
}
static struct video_device gemtek_radio = {
.owner = THIS_MODULE,
.name = "GemTek Radio card",
.type = VID_TYPE_TUNER,
.fops = &gemtek_fops,
.vidioc_querycap = vidioc_querycap,
.vidioc_g_tuner = vidioc_g_tuner,
.vidioc_s_tuner = vidioc_s_tuner,
.vidioc_g_audio = vidioc_g_audio,
.vidioc_s_audio = vidioc_s_audio,
.vidioc_g_input = vidioc_g_input,
.vidioc_s_input = vidioc_s_input,
.vidioc_g_frequency = vidioc_g_frequency,
.vidioc_s_frequency = vidioc_s_frequency,
.vidioc_queryctrl = vidioc_queryctrl,
.vidioc_g_ctrl = vidioc_g_ctrl,
.vidioc_s_ctrl = vidioc_s_ctrl
};
/*
* Initialization / cleanup related stuff.
*/
/*
* Initilize card.
*/
static int __init gemtek_init(void)
{
printk(KERN_INFO RADIO_BANNER "\n");
spin_lock_init(&lock);
gemtek_probe();
if (io) {
if (!request_region(io, 1, "gemtek")) {
printk(KERN_ERR "I/O port 0x%x already in use.\n", io);
return -EBUSY;
}
if (!gemtek_verify(io))
printk(KERN_WARNING "Card at I/O port 0x%x does not "
"respond properly, check your "
"configuration.\n", io);
else
printk(KERN_INFO "Using I/O port 0x%x.\n", io);
} else if (probe) {
printk(KERN_ERR "Automatic probing failed and no "
"fixed I/O port defined.\n");
return -ENODEV;
} else {
printk(KERN_ERR "Automatic probing disabled but no fixed "
"I/O port defined.");
return -EINVAL;
}
gemtek_radio.priv = &gemtek_unit;
if (video_register_device(&gemtek_radio, VFL_TYPE_RADIO,
radio_nr) == -1) {
release_region(io, 1);
return -EBUSY;
}
/* Set defaults */
gemtek_unit.lastfreq = GEMTEK_LOWFREQ;
gemtek_unit.bu2614data = 0;
if (initmute)
gemtek_mute(&gemtek_unit);
return 0;
}
/*
* Module cleanup
*/
static void __exit gemtek_exit(void)
{
if (shutdown) {
hardmute = 1; /* Turn off PLL */
gemtek_mute(&gemtek_unit);
} else {
printk(KERN_INFO "Module unloaded but card not muted!\n");
}
video_unregister_device(&gemtek_radio);
release_region(io, 1);
}
module_init(gemtek_init);
module_exit(gemtek_exit);
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