WebSVN - shark - Rev 538 - /shark/branches/xen/drivers/input/joystick/analog.c

/*
* $Id: analog.c,v 1.2 2004-03-29 18:27:43 mauro Exp $
*
* Copyright (c) 1996-2001 Vojtech Pavlik
*/

/*
* Analog joystick and gamepad driver for Linux
*/

/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/

#include <linuxcomp.h>

#include <linux/config.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/gameport.h>
#include <asm/timex.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Analog joystick and gamepad driver");
MODULE_LICENSE("GPL");

/*
* Option parsing.
*/

#define ANALOG_PORTS 16

static char *js[ANALOG_PORTS];
static int analog_options[ANALOG_PORTS];
MODULE_PARM(js, "1-" __MODULE_STRING(ANALOG_PORTS) "s");
MODULE_PARM_DESC(js, "Analog joystick options");

/*
* Times, feature definitions.
*/

#define ANALOG_RUDDER 0x00004
#define ANALOG_THROTTLE 0x00008
#define ANALOG_AXES_STD 0x0000f
#define ANALOG_BTNS_STD 0x000f0

#define ANALOG_BTNS_CHF 0x00100
#define ANALOG_HAT1_CHF 0x00200
#define ANALOG_HAT2_CHF 0x00400
#define ANALOG_HAT_FCS 0x00800
#define ANALOG_HATS_ALL 0x00e00
#define ANALOG_BTN_TL 0x01000
#define ANALOG_BTN_TR 0x02000
#define ANALOG_BTN_TL2 0x04000
#define ANALOG_BTN_TR2 0x08000
#define ANALOG_BTNS_TLR 0x03000
#define ANALOG_BTNS_TLR2 0x0c000
#define ANALOG_BTNS_GAMEPAD 0x0f000

#define ANALOG_HBTN_CHF 0x10000
#define ANALOG_ANY_CHF 0x10700
#define ANALOG_SAITEK 0x20000
#define ANALOG_EXTENSIONS 0x7ff00
#define ANALOG_GAMEPAD 0x80000

#define ANALOG_MAX_TIME 3 /* 3 ms */
#define ANALOG_LOOP_TIME 2000 /* 2 * loop */
#define ANALOG_REFRESH_TIME HZ/100 /* 10 ms */
#define ANALOG_SAITEK_DELAY 200 /* 200 us */
#define ANALOG_SAITEK_TIME 2000 /* 2000 us */
#define ANALOG_AXIS_TIME 2 /* 2 * refresh */
#define ANALOG_INIT_RETRIES 8 /* 8 times */
#define ANALOG_FUZZ_BITS 2 /* 2 bit more */
#define ANALOG_FUZZ_MAGIC 36 /* 36 u*ms/loop */

#define ANALOG_MAX_NAME_LENGTH 128
#define ANALOG_MAX_PHYS_LENGTH 32

static short analog_axes[] = { ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE };
static short analog_hats[] = { ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };
static short analog_pads[] = { BTN_Y, BTN_Z, BTN_TL, BTN_TR };
static short analog_exts[] = { ANALOG_HAT1_CHF, ANALOG_HAT2_CHF, ANALOG_HAT_FCS };
static short analog_pad_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_TL2, BTN_TR2, BTN_SELECT, BTN_START, BTN_MODE, BTN_BASE };
static short analog_joy_btn[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2,
BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_BASE6 };

static unsigned char analog_chf[] = { 0xf, 0x0, 0x1, 0x9, 0x2, 0x4, 0xc, 0x8, 0x3, 0x5, 0xb, 0x7, 0xd, 0xe, 0xa, 0x6 };

struct analog {
struct input_dev dev;
int mask;
short *buttons;
char name[ANALOG_MAX_NAME_LENGTH];
char phys[ANALOG_MAX_PHYS_LENGTH];
};

struct analog_port {
struct gameport *gameport;
struct timer_list timer;
struct analog analog[2];
unsigned char mask;
char saitek;
char cooked;
int bads;
int reads;
int speed;
int loop;
int fuzz;
int axes[4];
int buttons;
int initial[4];
int used;
int axtime;
};

/*
* Time macros.
*/

#ifdef __i386__
/* !!! Added by Nino !!! */
#define GET_TIME(x) (x = get_time_pit())
#define DELTA(x,y) ((y)-(x))
#define TIME_NAME ("Shark")
/*#define GET_TIME(x) do { if (cpu_has_tsc) rdtscl(x); else x = get_time_pit(); } while (0)
#define DELTA(x,y) (cpu_has_tsc?((y)-(x)):((x)-(y)+((x)<(y)?1193182L/HZ:0)))
#define TIME_NAME (cpu_has_tsc?"TSC":"PIT")*/
static unsigned int get_time_pit(void)
{
extern spinlock_t i8253_lock;
unsigned long flags;
unsigned int count;

spin_lock_irqsave(&i8253_lock, flags);
outb_p(0x00, 0x43);
count = inb_p(0x40);
count |= inb_p(0x40) << 8;
spin_unlock_irqrestore(&i8253_lock, flags);

return count;
}
#elif __x86_64__
#define GET_TIME(x) rdtscl(x)
#define DELTA(x,y) ((y)-(x))
#define TIME_NAME "TSC"
#elif __alpha__
#define GET_TIME(x) do { x = get_cycles(); } while (0)
#define DELTA(x,y) ((y)-(x))
#define TIME_NAME "PCC"
#else
#define FAKE_TIME
static unsigned long analog_faketime = 0;
#define GET_TIME(x) do { x = analog_faketime++; } while(0)
#define DELTA(x,y) ((y)-(x))
#define TIME_NAME "Unreliable"
#warning Precise timer not defined for this architecture.
#endif

/*
* analog_decode() decodes analog joystick data and reports input events.
*/

static void analog_decode(struct analog *analog, int *axes, int *initial, int buttons)
{
struct input_dev *dev = &analog->dev;
int i, j;

if (analog->mask & ANALOG_HAT_FCS)
for (i = 0; i < 4; i++)
if (axes[3] < ((initial[3] * ((i << 1) + 1)) >> 3)) {
buttons |= 1 << (i + 14);
break;
}

for (i = j = 0; i < 6; i++)
if (analog->mask & (0x10 << i))
input_report_key(dev, analog->buttons[j++], (buttons >> i) & 1);

if (analog->mask & ANALOG_HBTN_CHF)
for (i = 0; i < 4; i++)
input_report_key(dev, analog->buttons[j++], (buttons >> (i + 10)) & 1);

if (analog->mask & ANALOG_BTN_TL)
input_report_key(dev, analog_pads[0], axes[2] < (initial[2] >> 1));
if (analog->mask & ANALOG_BTN_TR)
input_report_key(dev, analog_pads[1], axes[3] < (initial[3] >> 1));
if (analog->mask & ANALOG_BTN_TL2)
input_report_key(dev, analog_pads[2], axes[2] > (initial[2] + (initial[2] >> 1)));
if (analog->mask & ANALOG_BTN_TR2)
input_report_key(dev, analog_pads[3], axes[3] > (initial[3] + (initial[3] >> 1)));

for (i = j = 0; i < 4; i++)
if (analog->mask & (1 << i))
input_report_abs(dev, analog_axes[j++], axes[i]);

for (i = j = 0; i < 3; i++)
if (analog->mask & analog_exts[i]) {
input_report_abs(dev, analog_hats[j++],
((buttons >> ((i << 2) + 7)) & 1) - ((buttons >> ((i << 2) + 9)) & 1));
input_report_abs(dev, analog_hats[j++],
((buttons >> ((i << 2) + 8)) & 1) - ((buttons >> ((i << 2) + 6)) & 1));
}

input_sync(dev);
}

/*
* analog_cooked_read() reads analog joystick data.
*/

static int analog_cooked_read(struct analog_port *port)
{
struct gameport *gameport = port->gameport;
unsigned int time[4], start, loop, now, loopout, timeout;
unsigned char data[4], this, last;
unsigned long flags;
int i, j;

loopout = (ANALOG_LOOP_TIME * port->loop) / 1000;
timeout = ANALOG_MAX_TIME * port->speed;

local_irq_save(flags);
gameport_trigger(gameport);
GET_TIME(now);
local_irq_restore(flags);

start = now;
this = port->mask;
i = 0;

do {
loop = now;
last = this;

local_irq_disable();
this = gameport_read(gameport) & port->mask;
GET_TIME(now);
local_irq_restore(flags);

if ((last ^ this) && (DELTA(loop, now) < loopout)) {
data[i] = last ^ this;
time[i] = now;
i++;
}

} while (this && (i < 4) && (DELTA(start, now) < timeout));

this <<= 4;

for (--i; i >= 0; i--) {
this |= data[i];
for (j = 0; j < 4; j++)
if (data[i] & (1 << j))
port->axes[j] = (DELTA(start, time[i]) << ANALOG_FUZZ_BITS) / port->loop;
}

return -(this != port->mask);
}

static int analog_button_read(struct analog_port *port, char saitek, char chf)
{
unsigned char u;
int t = 1, i = 0;
int strobe = gameport_time(port->gameport, ANALOG_SAITEK_TIME);

u = gameport_read(port->gameport);

if (!chf) {
port->buttons = (~u >> 4) & 0xf;
return 0;
}

port->buttons = 0;

while ((~u & 0xf0) && (i < 16) && t) {
port->buttons |= 1 << analog_chf[(~u >> 4) & 0xf];
if (!saitek) return 0;
udelay(ANALOG_SAITEK_DELAY);
t = strobe;
gameport_trigger(port->gameport);
while (((u = gameport_read(port->gameport)) & port->mask) && t) t--;
i++;
}

return -(!t || (i == 16));
}

/*
* analog_timer() repeatedly polls the Analog joysticks.
*/

static void analog_timer(unsigned long data)
{
struct analog_port *port = (void *) data;
int i;

char saitek = !!(port->analog[0].mask & ANALOG_SAITEK);
char chf = !!(port->analog[0].mask & ANALOG_ANY_CHF);

if (port->cooked) {
port->bads -= gameport_cooked_read(port->gameport, port->axes, &port->buttons);
if (chf)
port->buttons = port->buttons ? (1 << analog_chf[port->buttons]) : 0;
port->reads++;
} else {
if (!port->axtime--) {
port->bads -= analog_cooked_read(port);
port->bads -= analog_button_read(port, saitek, chf);
port->reads++;
port->axtime = ANALOG_AXIS_TIME - 1;
} else {
if (!saitek)
analog_button_read(port, saitek, chf);
}
}

for (i = 0; i < 2; i++)
if (port->analog[i].mask)
analog_decode(port->analog + i, port->axes, port->initial, port->buttons);

mod_timer(&port->timer, jiffies26 + ANALOG_REFRESH_TIME);
}

/*
* analog_open() is a callback from the input open routine.
*/

static int analog_open(struct input_dev *dev)
{
struct analog_port *port = dev->private;
if (!port->used++)
mod_timer(&port->timer, jiffies26 + ANALOG_REFRESH_TIME);
return 0;
}

/*
* analog_close() is a callback from the input close routine.
*/

static void analog_close(struct input_dev *dev)
{
struct analog_port *port = dev->private;
if (!--port->used)
del_timer(&port->timer);
}

/*
* analog_calibrate_timer() calibrates the timer and computes loop
* and timeout values for a joystick port.
*/

static void analog_calibrate_timer(struct analog_port *port)
{
struct gameport *gameport = port->gameport;
unsigned int i, t, tx, t1, t2, t3;
unsigned long flags;

local_irq_save(flags);
GET_TIME(t1);
#ifdef FAKE_TIME
analog_faketime += 830;
#endif
udelay(1000);
GET_TIME(t2);
GET_TIME(t3);
local_irq_restore(flags);

port->speed = DELTA(t1, t2) - DELTA(t2, t3);

tx = ~0;

for (i = 0; i < 50; i++) {
local_irq_save(flags);
GET_TIME(t1);
for (t = 0; t < 50; t++) { gameport_read(gameport); GET_TIME(t2); }
GET_TIME(t3);
local_irq_restore(flags);
udelay(i);
t = DELTA(t1, t2) - DELTA(t2, t3);
if (t < tx) tx = t;
}

port->loop = tx / 50;
}

/*
* analog_name() constructs a name for an analog joystick.
*/

static void analog_name(struct analog *analog)
{
sprintf26(analog->name, "Analog %d-axis %d-button",
hweight8(analog->mask & ANALOG_AXES_STD),
hweight8(analog->mask & ANALOG_BTNS_STD) + !!(analog->mask & ANALOG_BTNS_CHF) * 2 +
hweight16(analog->mask & ANALOG_BTNS_GAMEPAD) + !!(analog->mask & ANALOG_HBTN_CHF) * 4);

if (analog->mask & ANALOG_HATS_ALL)
sprintf26(analog->name, "%s %d-hat",
analog->name, hweight16(analog->mask & ANALOG_HATS_ALL));

if (analog->mask & ANALOG_HAT_FCS)
strcat(analog->name, " FCS");
if (analog->mask & ANALOG_ANY_CHF)
strcat(analog->name, (analog->mask & ANALOG_SAITEK) ? " Saitek" : " CHF");

strcat(analog->name, (analog->mask & ANALOG_GAMEPAD) ? " gamepad": " joystick");
}

/*
* analog_init_device()
*/

static void analog_init_device(struct analog_port *port, struct analog *analog, int index)
{
int i, j, t, v, w, x, y, z;

analog_name(analog);
sprintf26(analog->phys, "%s/input%d", port->gameport->phys, index);
analog->buttons = (analog->mask & ANALOG_GAMEPAD) ? analog_pad_btn : analog_joy_btn;

init_input_dev(&analog->dev);

analog->dev.name = analog->name;
analog->dev.phys = analog->phys;
analog->dev.id.bustype = BUS_GAMEPORT;
analog->dev.id.vendor = GAMEPORT_ID_VENDOR_ANALOG;
analog->dev.id.product = analog->mask >> 4;
analog->dev.id.version = 0x0100;

analog->dev.open = analog_open;
analog->dev.close = analog_close;
analog->dev.private = port;
analog->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);

for (i = j = 0; i < 4; i++)
if (analog->mask & (1 << i)) {

t = analog_axes[j];
x = port->axes[i];
y = (port->axes[0] + port->axes[1]) >> 1;
z = y - port->axes[i];
z = z > 0 ? z : -z;
v = (x >> 3);
w = (x >> 3);

set_bit(t, analog->dev.absbit);

if ((i == 2 || i == 3) && (j == 2 || j == 3) && (z > (y >> 3)))
x = y;

if (analog->mask & ANALOG_SAITEK) {
if (i == 2) x = port->axes[i];
v = x - (x >> 2);
w = (x >> 4);
}

analog->dev.absmax[t] = (x << 1) - v;
analog->dev.absmin[t] = v;
analog->dev.absfuzz[t] = port->fuzz;
analog->dev.absflat[t] = w;

j++;
}

for (i = j = 0; i < 3; i++)
if (analog->mask & analog_exts[i])
for (x = 0; x < 2; x++) {
t = analog_hats[j++];
set_bit(t, analog->dev.absbit);
analog->dev.absmax[t] = 1;
analog->dev.absmin[t] = -1;
}

for (i = j = 0; i < 4; i++)
if (analog->mask & (0x10 << i))
set_bit(analog->buttons[j++], analog->dev.keybit);

if (analog->mask & ANALOG_BTNS_CHF)
for (i = 0; i < 2; i++)
set_bit(analog->buttons[j++], analog->dev.keybit);

if (analog->mask & ANALOG_HBTN_CHF)
for (i = 0; i < 4; i++)
set_bit(analog->buttons[j++], analog->dev.keybit);

for (i = 0; i < 4; i++)
if (analog->mask & (ANALOG_BTN_TL << i))
set_bit(analog_pads[i], analog->dev.keybit);

analog_decode(analog, port->axes, port->initial, port->buttons);

input_register_device(&analog->dev);

printk(KERN_INFO "input: %s at %s", analog->name, port->gameport->phys);

if (port->cooked)
printk(" [ADC port]\n");
else
printk(" [%s timer, %d %sHz clock, %d ns res]\n", TIME_NAME,
port->speed > 10000 ? (port->speed + 800) / 1000 : port->speed,
port->speed > 10000 ? "M" : "k",
port->speed > 10000 ? (port->loop * 1000) / (port->speed / 1000)
: (port->loop * 1000000) / port->speed);
}

/*
* analog_init_devices() sets up device-specific values and registers the input devices.
*/

static int analog_init_masks(struct analog_port *port)
{
int i;
struct analog *analog = port->analog;
int max[4];

if (!port->mask)
return -1;

if ((port->mask & 3) != 3 && port->mask != 0xc) {
printk(KERN_WARNING "analog.c: Unknown joystick device found "
"(data=%#x, %s), probably not analog joystick.\n",
port->mask, port->gameport->phys);
return -1;
}

i = analog_options[0]; /* FIXME !!! - need to specify options for different ports */

analog[0].mask = i & 0xfffff;

analog[0].mask &= ~(ANALOG_AXES_STD | ANALOG_HAT_FCS | ANALOG_BTNS_GAMEPAD)
| port->mask | ((port->mask << 8) & ANALOG_HAT_FCS)
| ((port->mask << 10) & ANALOG_BTNS_TLR) | ((port->mask << 12) & ANALOG_BTNS_TLR2);

analog[0].mask &= ~(ANALOG_HAT2_CHF)
| ((analog[0].mask & ANALOG_HBTN_CHF) ? 0 : ANALOG_HAT2_CHF);

analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_BTN_TR | ANALOG_BTN_TR2)
| ((~analog[0].mask & ANALOG_HAT_FCS) >> 8)
| ((~analog[0].mask & ANALOG_HAT_FCS) << 2)
| ((~analog[0].mask & ANALOG_HAT_FCS) << 4);

analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_RUDDER)
| (((~analog[0].mask & ANALOG_BTNS_TLR ) >> 10)
& ((~analog[0].mask & ANALOG_BTNS_TLR2) >> 12));

analog[1].mask = ((i >> 20) & 0xff) | ((i >> 12) & 0xf0000);

analog[1].mask &= (analog[0].mask & ANALOG_EXTENSIONS) ? ANALOG_GAMEPAD
: (((ANALOG_BTNS_STD | port->mask) & ~analog[0].mask) | ANALOG_GAMEPAD);

if (port->cooked) {

for (i = 0; i < 4; i++) max[i] = port->axes[i] << 1;

if ((analog[0].mask & 0x7) == 0x7) max[2] = (max[0] + max[1]) >> 1;
if ((analog[0].mask & 0xb) == 0xb) max[3] = (max[0] + max[1]) >> 1;
if ((analog[0].mask & ANALOG_BTN_TL) && !(analog[0].mask & ANALOG_BTN_TL2)) max[2] >>= 1;
if ((analog[0].mask & ANALOG_BTN_TR) && !(analog[0].mask & ANALOG_BTN_TR2)) max[3] >>= 1;
if ((analog[0].mask & ANALOG_HAT_FCS)) max[3] >>= 1;

gameport_calibrate(port->gameport, port->axes, max);
}

for (i = 0; i < 4; i++)
port->initial[i] = port->axes[i];

return -!(analog[0].mask || analog[1].mask);
}

static int analog_init_port(struct gameport *gameport, struct gameport_dev *dev, struct analog_port *port)
{
int i, t, u, v;

gameport->private = port;
port->gameport = gameport;
init_timer(&port->timer);
port->timer.data = (long) port;
port->timer.function = analog_timer;

if (!gameport_open(gameport, dev, GAMEPORT_MODE_RAW)) {

analog_calibrate_timer(port);

gameport_trigger(gameport);
t = gameport_read(gameport);
wait_ms(ANALOG_MAX_TIME);
port->mask = (gameport_read(gameport) ^ t) & t & 0xf;
port->fuzz = (port->speed * ANALOG_FUZZ_MAGIC) / port->loop / 1000 + ANALOG_FUZZ_BITS;

for (i = 0; i < ANALOG_INIT_RETRIES; i++) {
if (!analog_cooked_read(port)) break;
wait_ms(ANALOG_MAX_TIME);
}

u = v = 0;

wait_ms(ANALOG_MAX_TIME);
t = gameport_time(gameport, ANALOG_MAX_TIME * 1000);
gameport_trigger(gameport);
while ((gameport_read(port->gameport) & port->mask) && (u < t)) u++;
udelay(ANALOG_SAITEK_DELAY);
t = gameport_time(gameport, ANALOG_SAITEK_TIME);
gameport_trigger(gameport);
while ((gameport_read(port->gameport) & port->mask) && (v < t)) v++;

if (v < (u >> 1)) { /* FIXME - more than one port */
analog_options[0] |= /* FIXME - more than one port */
ANALOG_SAITEK | ANALOG_BTNS_CHF | ANALOG_HBTN_CHF | ANALOG_HAT1_CHF;
return 0;
}

gameport_close(gameport);
}

if (!gameport_open(gameport, dev, GAMEPORT_MODE_COOKED)) {

for (i = 0; i < ANALOG_INIT_RETRIES; i++)
if (!gameport_cooked_read(gameport, port->axes, &port->buttons))
break;
for (i = 0; i < 4; i++)
if (port->axes[i] != -1) port->mask |= 1 << i;

port->fuzz = gameport->fuzz;
port->cooked = 1;
return 0;
}

if (!gameport_open(gameport, dev, GAMEPORT_MODE_RAW))
return 0;

return -1;
}

static void analog_connect(struct gameport *gameport, struct gameport_dev *dev)
{
struct analog_port *port;
int i;

if (!(port = kmalloc(sizeof(struct analog_port), GFP_KERNEL)))
return;
memset(port, 0, sizeof(struct analog_port));

if (analog_init_port(gameport, dev, port)) {
kfree(port);
return;
}

if (analog_init_masks(port)) {
gameport_close(gameport);
kfree(port);
return;
}

for (i = 0; i < 2; i++)
if (port->analog[i].mask)
analog_init_device(port, port->analog + i, i);
}

static void analog_disconnect(struct gameport *gameport)
{
int i;

struct analog_port *port = gameport->private;
for (i = 0; i < 2; i++)
if (port->analog[i].mask)
input_unregister_device(&port->analog[i].dev);
gameport_close(gameport);
printk(KERN_INFO "analog.c: %d out of %d reads (%d%%) on %s failed\n",
port->bads, port->reads, port->reads ? (port->bads * 100 / port->reads) : 0,
port->gameport->phys);
kfree(port);
}

struct analog_types {
char *name;
int value;
};

struct analog_types analog_types[] = {
{ "none", 0x00000000 },
{ "auto", 0x000000ff },
{ "2btn", 0x0000003f },
{ "y-joy", 0x0cc00033 },
{ "y-pad", 0x8cc80033 },
{ "fcs", 0x000008f7 },
{ "chf", 0x000002ff },
{ "fullchf", 0x000007ff },
{ "gamepad", 0x000830f3 },
{ "gamepad8", 0x0008f0f3 },
{ NULL, 0 }
};

static void analog_parse_options(void)
{
int i, j;
char *end;

for (i = 0; i < ANALOG_PORTS && js[i]; i++) {

for (j = 0; analog_types[j].name; j++)
if (!strcmp(analog_types[j].name, js[i])) {
analog_options[i] = analog_types[j].value;
break;
}
if (analog_types[j].name) continue;

analog_options[i] = simple_strtoul(js[i], &end, 0);
if (end != js[i]) continue;

analog_options[i] = 0xff;
if (!strlen(js[i])) continue;

printk(KERN_WARNING "analog.c: Bad config for port %d - \"%s\"\n", i, js[i]);
}

for (; i < ANALOG_PORTS; i++)
analog_options[i] = 0xff;
}

/*
* The gameport device structure.
*/

static struct gameport_dev analog_dev = {
.connect = analog_connect,
.disconnect = analog_disconnect,
};

#ifndef MODULE
static int __init analog_setup(char *str)
{
char *s = str;
int i = 0;

if (!str || !*str) return 0;

while ((str = s) && (i < ANALOG_PORTS)) {
if ((s = strchr(str,','))) *s++ = 0;
js[i++] = str;
}

return 1;
}
__setup("js=", analog_setup);
#endif

int __init analog_init(void)
{
analog_parse_options();
gameport_register_device(&analog_dev);
return 0;
}

void __exit analog_exit(void)
{
gameport_unregister_device(&analog_dev);
}

module_init(analog_init);
module_exit(analog_exit);

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(root)/shark/branches/xen/drivers/input/joystick/analog.c - Rev 538