diff options
Diffstat (limited to 'drivers/char/joystick/gameport.c')
| -rw-r--r-- | drivers/char/joystick/gameport.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/char/joystick/gameport.c b/drivers/char/joystick/gameport.c new file mode 100644 index 000000000..5a5e1219b --- /dev/null +++ b/drivers/char/joystick/gameport.c @@ -0,0 +1,198 @@ +/* + * $Id: gameport.c,v 1.5 2000/05/29 10:54:53 vojtech Exp $ + * + * Copyright (c) 1999-2000 Vojtech Pavlik + * + * Sponsored by SuSE + */ + +/* + * Generic gameport layer + */ + +/* + * 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@suse.cz>, or by paper mail: + * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic + */ + +#include <asm/io.h> +#include <linux/module.h> +#include <linux/ioport.h> +#include <linux/init.h> +#include <linux/gameport.h> +#include <linux/malloc.h> +#include <linux/isapnp.h> +#include <linux/stddef.h> +#include <linux/delay.h> + +MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); + +EXPORT_SYMBOL(gameport_register_port); +EXPORT_SYMBOL(gameport_unregister_port); +EXPORT_SYMBOL(gameport_register_device); +EXPORT_SYMBOL(gameport_unregister_device); +EXPORT_SYMBOL(gameport_open); +EXPORT_SYMBOL(gameport_close); +EXPORT_SYMBOL(gameport_rescan); +EXPORT_SYMBOL(gameport_cooked_read); + +static struct gameport *gameport_list = NULL; +static struct gameport_dev *gameport_dev = NULL; +static int gameport_number = 0; + +/* + * gameport_measure_speed() measures the gameport i/o speed. + */ + +static int gameport_measure_speed(struct gameport *gameport) +{ +#ifdef __i386__ + +#define GET_TIME(x) do { outb(0, 0x43); x = inb(0x40); x |= inb(0x40) << 8; } while (0) +#define DELTA(x,y) ((y)-(x)+((y)<(x)?1193180L/HZ:0)) + + unsigned int i, t, t1, t2, t3, tx; + unsigned long flags; + + if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) + return 0; + + tx = 1 << 30; + + for(i = 0; i < 50; i++) { + save_flags(flags); /* Yes, all CPUs */ + cli(); + GET_TIME(t1); + for(t = 0; t < 50; t++) gameport_read(gameport); + GET_TIME(t2); + GET_TIME(t3); + restore_flags(flags); + udelay(i * 10); + if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; + } + + return 59659 / (tx < 1 ? 1 : tx); + +#else + + unsigned int j, t = 0; + + j = jiffies; while (j == jiffies); + j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); } + + return t * HZ / 1000; + +#endif + + gameport_close(gameport); +} + +static void gameport_find_dev(struct gameport *gameport) +{ + struct gameport_dev *dev = gameport_dev; + + while (dev && !gameport->dev) { + if (dev->connect) + dev->connect(gameport, dev); + dev = dev->next; + } +} + +void gameport_rescan(struct gameport *gameport) +{ + gameport_close(gameport); + gameport_find_dev(gameport); +} + +void gameport_register_port(struct gameport *gameport) +{ + gameport->number = gameport_number++; + gameport->next = gameport_list; + gameport_list = gameport; + + gameport->speed = gameport_measure_speed(gameport); + + gameport_find_dev(gameport); +} + +void gameport_unregister_port(struct gameport *gameport) +{ + struct gameport **gameportptr = &gameport_list; + + while (*gameportptr && (*gameportptr != gameport)) gameportptr = &((*gameportptr)->next); + *gameportptr = (*gameportptr)->next; + + if (gameport->dev && gameport->dev->disconnect) + gameport->dev->disconnect(gameport); + + gameport_number--; +} + +void gameport_register_device(struct gameport_dev *dev) +{ + struct gameport *gameport = gameport_list; + + dev->next = gameport_dev; + gameport_dev = dev; + + while (gameport) { + if (!gameport->dev && dev->connect) + dev->connect(gameport, dev); + gameport = gameport->next; + } +} + +void gameport_unregister_device(struct gameport_dev *dev) +{ + struct gameport_dev **devptr = &gameport_dev; + struct gameport *gameport = gameport_list; + + while (*devptr && (*devptr != dev)) devptr = &((*devptr)->next); + *devptr = (*devptr)->next; + + while (gameport) { + if (gameport->dev == dev && dev->disconnect) + dev->disconnect(gameport); + gameport_find_dev(gameport); + gameport = gameport->next; + } +} + +int gameport_open(struct gameport *gameport, struct gameport_dev *dev, int mode) +{ + if (gameport->open) { + if (gameport->open(gameport, mode)) + return -1; + } else { + if (mode != GAMEPORT_MODE_RAW) + return -1; + } + + if (gameport->dev) + return -1; + + gameport->dev = dev; + + return 0; +} + +void gameport_close(struct gameport *gameport) +{ + gameport->dev = NULL; + if (gameport->close) gameport->close(gameport); +} |