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OpenCloudOS-Kernel/drivers/input/joystick/gamecon.c

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/*
* NES, SNES, N64, MultiSystem, PSX gamepad driver for Linux
*
* Copyright (c) 1999-2004 Vojtech Pavlik <vojtech@suse.cz>
* Copyright (c) 2004 Peter Nelson <rufus-kernel@hackish.org>
*
* Based on the work of:
* Andree Borrmann John Dahlstrom
* David Kuder Nathan Hand
*/
/*
* 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 <linux/kernel.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/parport.h>
#include <linux/input.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("NES, SNES, N64, MultiSystem, PSX gamepad driver");
MODULE_LICENSE("GPL");
#define GC_MAX_PORTS 3
#define GC_MAX_DEVICES 5
struct gc_config {
int args[GC_MAX_DEVICES + 1];
int nargs;
};
static struct gc_config gc[GC_MAX_PORTS] __initdata;
module_param_array_named(map, gc[0].args, int, &gc[0].nargs, 0);
MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<pad1>,<pad2>,..<pad5>)");
module_param_array_named(map2, gc[1].args, int, &gc[1].nargs, 0);
MODULE_PARM_DESC(map2, "Describes second set of devices");
module_param_array_named(map3, gc[2].args, int, &gc[2].nargs, 0);
MODULE_PARM_DESC(map3, "Describes third set of devices");
__obsolete_setup("gc=");
__obsolete_setup("gc_2=");
__obsolete_setup("gc_3=");
/* see also gs_psx_delay parameter in PSX support section */
#define GC_SNES 1
#define GC_NES 2
#define GC_NES4 3
#define GC_MULTI 4
#define GC_MULTI2 5
#define GC_N64 6
#define GC_PSX 7
#define GC_DDR 8
#define GC_MAX 8
#define GC_REFRESH_TIME HZ/100
struct gc {
struct pardevice *pd;
struct input_dev *dev[GC_MAX_DEVICES];
struct timer_list timer;
unsigned char pads[GC_MAX + 1];
int used;
struct semaphore sem;
char phys[GC_MAX_DEVICES][32];
};
static struct gc *gc_base[3];
static int gc_status_bit[] = { 0x40, 0x80, 0x20, 0x10, 0x08 };
static char *gc_names[] = { NULL, "SNES pad", "NES pad", "NES FourPort", "Multisystem joystick",
"Multisystem 2-button joystick", "N64 controller", "PSX controller",
"PSX DDR controller" };
/*
* N64 support.
*/
static unsigned char gc_n64_bytes[] = { 0, 1, 13, 15, 14, 12, 10, 11, 2, 3 };
static short gc_n64_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_TRIGGER, BTN_START };
#define GC_N64_LENGTH 32 /* N64 bit length, not including stop bit */
#define GC_N64_REQUEST_LENGTH 37 /* transmit request sequence is 9 bits long */
#define GC_N64_DELAY 133 /* delay between transmit request, and response ready (us) */
#define GC_N64_REQUEST 0x1dd1111111ULL /* the request data command (encoded for 000000011) */
#define GC_N64_DWS 3 /* delay between write segments (required for sound playback because of ISA DMA) */
/* GC_N64_DWS > 24 is known to fail */
#define GC_N64_POWER_W 0xe2 /* power during write (transmit request) */
#define GC_N64_POWER_R 0xfd /* power during read */
#define GC_N64_OUT 0x1d /* output bits to the 4 pads */
/* Reading the main axes of any N64 pad is known to fail if the corresponding bit */
/* in GC_N64_OUT is pulled low on the output port (by any routine) for more */
/* than 123 us */
#define GC_N64_CLOCK 0x02 /* clock bits for read */
/*
* gc_n64_read_packet() reads an N64 packet.
* Each pad uses one bit per byte. So all pads connected to this port are read in parallel.
*/
static void gc_n64_read_packet(struct gc *gc, unsigned char *data)
{
int i;
unsigned long flags;
/*
* Request the pad to transmit data
*/
local_irq_save(flags);
for (i = 0; i < GC_N64_REQUEST_LENGTH; i++) {
parport_write_data(gc->pd->port, GC_N64_POWER_W | ((GC_N64_REQUEST >> i) & 1 ? GC_N64_OUT : 0));
udelay(GC_N64_DWS);
}
local_irq_restore(flags);
/*
* Wait for the pad response to be loaded into the 33-bit register of the adapter
*/
udelay(GC_N64_DELAY);
/*
* Grab data (ignoring the last bit, which is a stop bit)
*/
for (i = 0; i < GC_N64_LENGTH; i++) {
parport_write_data(gc->pd->port, GC_N64_POWER_R);
data[i] = parport_read_status(gc->pd->port);
parport_write_data(gc->pd->port, GC_N64_POWER_R | GC_N64_CLOCK);
}
/*
* We must wait 200 ms here for the controller to reinitialize before the next read request.
* No worries as long as gc_read is polled less frequently than this.
*/
}
/*
* NES/SNES support.
*/
#define GC_NES_DELAY 6 /* Delay between bits - 6us */
#define GC_NES_LENGTH 8 /* The NES pads use 8 bits of data */
#define GC_SNES_LENGTH 12 /* The SNES true length is 16, but the last 4 bits are unused */
#define GC_NES_POWER 0xfc
#define GC_NES_CLOCK 0x01
#define GC_NES_LATCH 0x02
static unsigned char gc_nes_bytes[] = { 0, 1, 2, 3 };
static unsigned char gc_snes_bytes[] = { 8, 0, 2, 3, 9, 1, 10, 11 };
static short gc_snes_btn[] = { BTN_A, BTN_B, BTN_SELECT, BTN_START, BTN_X, BTN_Y, BTN_TL, BTN_TR };
/*
* gc_nes_read_packet() reads a NES/SNES packet.
* Each pad uses one bit per byte. So all pads connected to
* this port are read in parallel.
*/
static void gc_nes_read_packet(struct gc *gc, int length, unsigned char *data)
{
int i;
parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK | GC_NES_LATCH);
udelay(GC_NES_DELAY * 2);
parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK);
for (i = 0; i < length; i++) {
udelay(GC_NES_DELAY);
parport_write_data(gc->pd->port, GC_NES_POWER);
data[i] = parport_read_status(gc->pd->port) ^ 0x7f;
udelay(GC_NES_DELAY);
parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK);
}
}
/*
* Multisystem joystick support
*/
#define GC_MULTI_LENGTH 5 /* Multi system joystick packet length is 5 */
#define GC_MULTI2_LENGTH 6 /* One more bit for one more button */
/*
* gc_multi_read_packet() reads a Multisystem joystick packet.
*/
static void gc_multi_read_packet(struct gc *gc, int length, unsigned char *data)
{
int i;
for (i = 0; i < length; i++) {
parport_write_data(gc->pd->port, ~(1 << i));
data[i] = parport_read_status(gc->pd->port) ^ 0x7f;
}
}
/*
* PSX support
*
* See documentation at:
* http://www.dim.com/~mackys/psxmemcard/ps-eng2.txt
* http://www.gamesx.com/controldata/psxcont/psxcont.htm
* ftp://milano.usal.es/pablo/
*
*/
#define GC_PSX_DELAY 25 /* 25 usec */
#define GC_PSX_LENGTH 8 /* talk to the controller in bits */
#define GC_PSX_BYTES 6 /* the maximum number of bytes to read off the controller */
#define GC_PSX_MOUSE 1 /* Mouse */
#define GC_PSX_NEGCON 2 /* NegCon */
#define GC_PSX_NORMAL 4 /* Digital / Analog or Rumble in Digital mode */
#define GC_PSX_ANALOG 5 /* Analog in Analog mode / Rumble in Green mode */
#define GC_PSX_RUMBLE 7 /* Rumble in Red mode */
#define GC_PSX_CLOCK 0x04 /* Pin 4 */
#define GC_PSX_COMMAND 0x01 /* Pin 2 */
#define GC_PSX_POWER 0xf8 /* Pins 5-9 */
#define GC_PSX_SELECT 0x02 /* Pin 3 */
#define GC_PSX_ID(x) ((x) >> 4) /* High nibble is device type */
#define GC_PSX_LEN(x) (((x) & 0xf) << 1) /* Low nibble is length in bytes/2 */
static int gc_psx_delay = GC_PSX_DELAY;
module_param_named(psx_delay, gc_psx_delay, uint, 0);
MODULE_PARM_DESC(psx_delay, "Delay when accessing Sony PSX controller (usecs)");
__obsolete_setup("gc_psx_delay=");
static short gc_psx_abs[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_HAT0X, ABS_HAT0Y };
static short gc_psx_btn[] = { BTN_TL, BTN_TR, BTN_TL2, BTN_TR2, BTN_A, BTN_B, BTN_X, BTN_Y,
BTN_START, BTN_SELECT, BTN_THUMBL, BTN_THUMBR };
static short gc_psx_ddr_btn[] = { BTN_0, BTN_1, BTN_2, BTN_3 };
/*
* gc_psx_command() writes 8bit command and reads 8bit data from
* the psx pad.
*/
static void gc_psx_command(struct gc *gc, int b, unsigned char data[5])
{
int i, j, cmd, read;
for (i = 0; i < 5; i++)
data[i] = 0;
for (i = 0; i < GC_PSX_LENGTH; i++, b >>= 1) {
cmd = (b & 1) ? GC_PSX_COMMAND : 0;
parport_write_data(gc->pd->port, cmd | GC_PSX_POWER);
udelay(gc_psx_delay);
read = parport_read_status(gc->pd->port) ^ 0x80;
for (j = 0; j < 5; j++)
data[j] |= (read & gc_status_bit[j] & (gc->pads[GC_PSX] | gc->pads[GC_DDR])) ? (1 << i) : 0;
parport_write_data(gc->pd->port, cmd | GC_PSX_CLOCK | GC_PSX_POWER);
udelay(gc_psx_delay);
}
}
/*
* gc_psx_read_packet() reads a whole psx packet and returns
* device identifier code.
*/
static void gc_psx_read_packet(struct gc *gc, unsigned char data[5][GC_PSX_BYTES], unsigned char id[5])
{
int i, j, max_len = 0;
unsigned long flags;
unsigned char data2[5];
parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER); /* Select pad */
udelay(gc_psx_delay);
parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_POWER); /* Deselect, begin command */
udelay(gc_psx_delay);
local_irq_save(flags);
gc_psx_command(gc, 0x01, data2); /* Access pad */
gc_psx_command(gc, 0x42, id); /* Get device ids */
gc_psx_command(gc, 0, data2); /* Dump status */
for (i =0; i < 5; i++) /* Find the longest pad */
if((gc_status_bit[i] & (gc->pads[GC_PSX] | gc->pads[GC_DDR]))
&& (GC_PSX_LEN(id[i]) > max_len)
&& (GC_PSX_LEN(id[i]) <= GC_PSX_BYTES))
max_len = GC_PSX_LEN(id[i]);
for (i = 0; i < max_len; i++) { /* Read in all the data */
gc_psx_command(gc, 0, data2);
for (j = 0; j < 5; j++)
data[j][i] = data2[j];
}
local_irq_restore(flags);
parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);
for(i = 0; i < 5; i++) /* Set id's to the real value */
id[i] = GC_PSX_ID(id[i]);
}
/*
* gc_timer() reads and analyzes console pads data.
*/
#define GC_MAX_LENGTH GC_N64_LENGTH
static void gc_timer(unsigned long private)
{
struct gc *gc = (void *) private;
unsigned char data[GC_MAX_LENGTH];
unsigned char data_psx[5][GC_PSX_BYTES];
int i, j, s;
/*
* N64 pads - must be read first, any read confuses them for 200 us
*/
if (gc->pads[GC_N64]) {
gc_n64_read_packet(gc, data);
for (i = 0; i < 5; i++) {
s = gc_status_bit[i];
if (s & gc->pads[GC_N64] & ~(data[8] | data[9])) {
signed char axes[2];
axes[0] = axes[1] = 0;
for (j = 0; j < 8; j++) {
if (data[23 - j] & s) axes[0] |= 1 << j;
if (data[31 - j] & s) axes[1] |= 1 << j;
}
input_report_abs(gc->dev[i], ABS_X, axes[0]);
input_report_abs(gc->dev[i], ABS_Y, -axes[1]);
input_report_abs(gc->dev[i], ABS_HAT0X, !(s & data[6]) - !(s & data[7]));
input_report_abs(gc->dev[i], ABS_HAT0Y, !(s & data[4]) - !(s & data[5]));
for (j = 0; j < 10; j++)
input_report_key(gc->dev[i], gc_n64_btn[j], s & data[gc_n64_bytes[j]]);
input_sync(gc->dev[i]);
}
}
}
/*
* NES and SNES pads
*/
if (gc->pads[GC_NES] || gc->pads[GC_SNES]) {
gc_nes_read_packet(gc, gc->pads[GC_SNES] ? GC_SNES_LENGTH : GC_NES_LENGTH, data);
for (i = 0; i < 5; i++) {
s = gc_status_bit[i];
if (s & (gc->pads[GC_NES] | gc->pads[GC_SNES])) {
input_report_abs(gc->dev[i], ABS_X, !(s & data[6]) - !(s & data[7]));
input_report_abs(gc->dev[i], ABS_Y, !(s & data[4]) - !(s & data[5]));
}
if (s & gc->pads[GC_NES])
for (j = 0; j < 4; j++)
input_report_key(gc->dev[i], gc_snes_btn[j], s & data[gc_nes_bytes[j]]);
if (s & gc->pads[GC_SNES])
for (j = 0; j < 8; j++)
input_report_key(gc->dev[i], gc_snes_btn[j], s & data[gc_snes_bytes[j]]);
input_sync(gc->dev[i]);
}
}
/*
* Multi and Multi2 joysticks
*/
if (gc->pads[GC_MULTI] || gc->pads[GC_MULTI2]) {
gc_multi_read_packet(gc, gc->pads[GC_MULTI2] ? GC_MULTI2_LENGTH : GC_MULTI_LENGTH, data);
for (i = 0; i < 5; i++) {
s = gc_status_bit[i];
if (s & (gc->pads[GC_MULTI] | gc->pads[GC_MULTI2])) {
input_report_abs(gc->dev[i], ABS_X, !(s & data[2]) - !(s & data[3]));
input_report_abs(gc->dev[i], ABS_Y, !(s & data[0]) - !(s & data[1]));
input_report_key(gc->dev[i], BTN_TRIGGER, s & data[4]);
}
if (s & gc->pads[GC_MULTI2])
input_report_key(gc->dev[i], BTN_THUMB, s & data[5]);
input_sync(gc->dev[i]);
}
}
/*
* PSX controllers
*/
if (gc->pads[GC_PSX] || gc->pads[GC_DDR]) {
gc_psx_read_packet(gc, data_psx, data);
for (i = 0; i < 5; i++) {
switch (data[i]) {
case GC_PSX_RUMBLE:
input_report_key(gc->dev[i], BTN_THUMBL, ~data_psx[i][0] & 0x04);
input_report_key(gc->dev[i], BTN_THUMBR, ~data_psx[i][0] & 0x02);
case GC_PSX_NEGCON:
case GC_PSX_ANALOG:
if (gc->pads[GC_DDR] & gc_status_bit[i]) {
for(j = 0; j < 4; j++)
input_report_key(gc->dev[i], gc_psx_ddr_btn[j], ~data_psx[i][0] & (0x10 << j));
} else {
for (j = 0; j < 4; j++)
input_report_abs(gc->dev[i], gc_psx_abs[j+2], data_psx[i][j + 2]);
input_report_abs(gc->dev[i], ABS_X, 128 + !(data_psx[i][0] & 0x20) * 127 - !(data_psx[i][0] & 0x80) * 128);
input_report_abs(gc->dev[i], ABS_Y, 128 + !(data_psx[i][0] & 0x40) * 127 - !(data_psx[i][0] & 0x10) * 128);
}
for (j = 0; j < 8; j++)
input_report_key(gc->dev[i], gc_psx_btn[j], ~data_psx[i][1] & (1 << j));
input_report_key(gc->dev[i], BTN_START, ~data_psx[i][0] & 0x08);
input_report_key(gc->dev[i], BTN_SELECT, ~data_psx[i][0] & 0x01);
input_sync(gc->dev[i]);
break;
case GC_PSX_NORMAL:
if (gc->pads[GC_DDR] & gc_status_bit[i]) {
for(j = 0; j < 4; j++)
input_report_key(gc->dev[i], gc_psx_ddr_btn[j], ~data_psx[i][0] & (0x10 << j));
} else {
input_report_abs(gc->dev[i], ABS_X, 128 + !(data_psx[i][0] & 0x20) * 127 - !(data_psx[i][0] & 0x80) * 128);
input_report_abs(gc->dev[i], ABS_Y, 128 + !(data_psx[i][0] & 0x40) * 127 - !(data_psx[i][0] & 0x10) * 128);
/* for some reason if the extra axes are left unset they drift */
/* for (j = 0; j < 4; j++)
input_report_abs(gc->dev[i], gc_psx_abs[j+2], 128);
* This needs to be debugged properly,
* maybe fuzz processing needs to be done in input_sync()
* --vojtech
*/
}
for (j = 0; j < 8; j++)
input_report_key(gc->dev[i], gc_psx_btn[j], ~data_psx[i][1] & (1 << j));
input_report_key(gc->dev[i], BTN_START, ~data_psx[i][0] & 0x08);
input_report_key(gc->dev[i], BTN_SELECT, ~data_psx[i][0] & 0x01);
input_sync(gc->dev[i]);
break;
case 0: /* not a pad, ignore */
break;
}
}
}
mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
}
static int gc_open(struct input_dev *dev)
{
struct gc *gc = dev->private;
int err;
err = down_interruptible(&gc->sem);
if (err)
return err;
if (!gc->used++) {
parport_claim(gc->pd);
parport_write_control(gc->pd->port, 0x04);
mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
}
up(&gc->sem);
return 0;
}
static void gc_close(struct input_dev *dev)
{
struct gc *gc = dev->private;
down(&gc->sem);
if (!--gc->used) {
del_timer_sync(&gc->timer);
parport_write_control(gc->pd->port, 0x00);
parport_release(gc->pd);
}
up(&gc->sem);
}
static int __init gc_setup_pad(struct gc *gc, int idx, int pad_type)
{
struct input_dev *input_dev;
int i;
if (!pad_type)
return 0;
if (pad_type < 1 || pad_type > GC_MAX) {
printk(KERN_WARNING "gamecon.c: Pad type %d unknown\n", pad_type);
return -EINVAL;
}
gc->dev[idx] = input_dev = input_allocate_device();
if (!input_dev) {
printk(KERN_ERR "gamecon.c: Not enough memory for input device\n");
return -ENOMEM;
}
input_dev->name = gc_names[pad_type];
input_dev->phys = gc->phys[idx];
input_dev->id.bustype = BUS_PARPORT;
input_dev->id.vendor = 0x0001;
input_dev->id.product = pad_type;
input_dev->id.version = 0x0100;
input_dev->private = gc;
input_dev->open = gc_open;
input_dev->close = gc_close;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
for (i = 0; i < 2; i++)
input_set_abs_params(input_dev, ABS_X + i, -1, 1, 0, 0);
gc->pads[0] |= gc_status_bit[idx];
gc->pads[pad_type] |= gc_status_bit[idx];
switch (pad_type) {
case GC_N64:
for (i = 0; i < 10; i++)
set_bit(gc_n64_btn[i], input_dev->keybit);
for (i = 0; i < 2; i++) {
input_set_abs_params(input_dev, ABS_X + i, -127, 126, 0, 2);
input_set_abs_params(input_dev, ABS_HAT0X + i, -1, 1, 0, 0);
}
break;
case GC_SNES:
for (i = 4; i < 8; i++)
set_bit(gc_snes_btn[i], input_dev->keybit);
case GC_NES:
for (i = 0; i < 4; i++)
set_bit(gc_snes_btn[i], input_dev->keybit);
break;
case GC_MULTI2:
set_bit(BTN_THUMB, input_dev->keybit);
case GC_MULTI:
set_bit(BTN_TRIGGER, input_dev->keybit);
break;
case GC_PSX:
for (i = 0; i < 6; i++)
input_set_abs_params(input_dev, gc_psx_abs[i], 4, 252, 0, 2);
for (i = 0; i < 12; i++)
set_bit(gc_psx_btn[i], input_dev->keybit);
break;
case GC_DDR:
for (i = 0; i < 4; i++)
set_bit(gc_psx_ddr_btn[i], input_dev->keybit);
for (i = 0; i < 12; i++)
set_bit(gc_psx_btn[i], input_dev->keybit);
break;
}
return 0;
}
static struct gc __init *gc_probe(int parport, int *pads, int n_pads)
{
struct gc *gc;
struct parport *pp;
struct pardevice *pd;
int i;
int err;
pp = parport_find_number(parport);
if (!pp) {
printk(KERN_ERR "gamecon.c: no such parport\n");
err = -EINVAL;
goto err_out;
}
pd = parport_register_device(pp, "gamecon", NULL, NULL, NULL, PARPORT_DEV_EXCL, NULL);
if (!pd) {
printk(KERN_ERR "gamecon.c: parport busy already - lp.o loaded?\n");
err = -EBUSY;
goto err_put_pp;
}
gc = kzalloc(sizeof(struct gc), GFP_KERNEL);
if (!gc) {
printk(KERN_ERR "gamecon.c: Not enough memory\n");
err = -ENOMEM;
goto err_unreg_pardev;
}
init_MUTEX(&gc->sem);
gc->pd = pd;
init_timer(&gc->timer);
gc->timer.data = (long) gc;
gc->timer.function = gc_timer;
for (i = 0; i < n_pads; i++) {
if (!pads[i])
continue;
sprintf(gc->phys[i], "%s/input%d", gc->pd->port->name, i);
err = gc_setup_pad(gc, i, pads[i]);
if (err)
goto err_free_devs;
input_register_device(gc->dev[i]);
}
if (!gc->pads[0]) {
printk(KERN_ERR "gamecon.c: No valid devices specified\n");
err = -EINVAL;
goto err_free_gc;
}
parport_put_port(pp);
return gc;
err_free_devs:
while (--i >= 0)
input_unregister_device(gc->dev[i]);
err_free_gc:
kfree(gc);
err_unreg_pardev:
parport_unregister_device(pd);
err_put_pp:
parport_put_port(pp);
err_out:
return ERR_PTR(err);
}
static void __exit gc_remove(struct gc *gc)
{
int i;
for (i = 0; i < GC_MAX_DEVICES; i++)
if (gc->dev[i])
input_unregister_device(gc->dev[i]);
parport_unregister_device(gc->pd);
kfree(gc);
}
static int __init gc_init(void)
{
int i;
int have_dev = 0;
int err = 0;
for (i = 0; i < GC_MAX_PORTS; i++) {
if (gc[i].nargs == 0 || gc[i].args[0] < 0)
continue;
if (gc[i].nargs < 2) {
printk(KERN_ERR "gamecon.c: at least one device must be specified\n");
err = -EINVAL;
break;
}
gc_base[i] = gc_probe(gc[i].args[0], gc[i].args + 1, gc[i].nargs - 1);
if (IS_ERR(gc_base[i])) {
err = PTR_ERR(gc_base[i]);
break;
}
have_dev = 1;
}
if (err) {
while (--i >= 0)
gc_remove(gc_base[i]);
return err;
}
return have_dev ? 0 : -ENODEV;
}
static void __exit gc_exit(void)
{
int i;
for (i = 0; i < GC_MAX_PORTS; i++)
if (gc_base[i])
gc_remove(gc_base[i]);
}
module_init(gc_init);
module_exit(gc_exit);
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