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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 494 | giacomo | 1 | /* |
| 2 | * Generic gameport layer |
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| 3 | * |
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| 4 | * Copyright (c) 1999-2002 Vojtech Pavlik |
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| 5 | */ |
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| 6 | |||
| 7 | /* |
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| 8 | * This program is free software; you can redistribute it and/or modify it |
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| 9 | * under the terms of the GNU General Public License version 2 as published by |
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| 10 | * the Free Software Foundation. |
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| 11 | */ |
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| 12 | |||
| 13 | #include <linuxcomp.h> |
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| 14 | |||
| 15 | #include <asm/io.h> |
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| 16 | #include <linux/module.h> |
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| 17 | #include <linux/ioport.h> |
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| 18 | #include <linux/init.h> |
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| 19 | #include <linux/gameport.h> |
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| 20 | #include <linux/slab.h> |
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| 21 | #include <linux/stddef.h> |
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| 22 | #include <linux/delay.h> |
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| 23 | |||
| 24 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
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| 25 | MODULE_DESCRIPTION("Generic gameport layer"); |
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| 26 | MODULE_LICENSE("GPL"); |
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| 27 | |||
| 28 | EXPORT_SYMBOL(gameport_register_port); |
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| 29 | EXPORT_SYMBOL(gameport_unregister_port); |
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| 30 | EXPORT_SYMBOL(gameport_register_device); |
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| 31 | EXPORT_SYMBOL(gameport_unregister_device); |
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| 32 | EXPORT_SYMBOL(gameport_open); |
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| 33 | EXPORT_SYMBOL(gameport_close); |
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| 34 | EXPORT_SYMBOL(gameport_rescan); |
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| 35 | EXPORT_SYMBOL(gameport_cooked_read); |
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| 36 | |||
| 37 | static LIST_HEAD(gameport_list); |
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| 38 | static LIST_HEAD(gameport_dev_list); |
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| 39 | |||
| 40 | #ifdef __i386__ |
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| 546 | mauro | 41 | /* !!! Added by Nino !!! */ |
| 42 | extern TIME sys_gettime(struct timespec *t); |
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| 43 | #define GET_TIME(x) (x = sys_gettime(NULL)) |
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| 44 | #define DELTA(x,y) ((y)-(x)) |
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| 494 | giacomo | 45 | |
| 546 | mauro | 46 | /*#define DELTA(x,y) ((y)-(x)+((y)<(x)?1193182/HZ:0)) |
| 494 | giacomo | 47 | #define GET_TIME(x) do { x = get_time_pit(); } while (0) |
| 48 | |||
| 49 | static unsigned int get_time_pit(void) |
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| 50 | { |
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| 51 | extern spinlock_t i8253_lock; |
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| 52 | unsigned long flags; |
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| 53 | unsigned int count; |
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| 54 | |||
| 55 | spin_lock_irqsave(&i8253_lock, flags); |
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| 56 | outb_p(0x00, 0x43); |
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| 57 | count = inb_p(0x40); |
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| 58 | count |= inb_p(0x40) << 8; |
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| 59 | spin_unlock_irqrestore(&i8253_lock, flags); |
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| 60 | |||
| 61 | return count; |
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| 546 | mauro | 62 | }*/ |
| 494 | giacomo | 63 | |
| 64 | #endif |
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| 65 | |||
| 66 | /* |
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| 67 | * gameport_measure_speed() measures the gameport i/o speed. |
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| 68 | */ |
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| 69 | |||
| 70 | static int gameport_measure_speed(struct gameport *gameport) |
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| 71 | { |
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| 72 | #ifdef __i386__ |
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| 73 | |||
| 74 | unsigned int i, t, t1, t2, t3, tx; |
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| 75 | unsigned long flags; |
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| 76 | |||
| 77 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) |
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| 78 | return 0; |
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| 79 | |||
| 80 | tx = 1 << 30; |
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| 81 | |||
| 82 | for(i = 0; i < 50; i++) { |
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| 83 | local_irq_save(flags); |
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| 84 | GET_TIME(t1); |
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| 85 | for(t = 0; t < 50; t++) gameport_read(gameport); |
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| 86 | GET_TIME(t2); |
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| 87 | GET_TIME(t3); |
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| 88 | local_irq_restore(flags); |
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| 89 | udelay(i * 10); |
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| 90 | if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; |
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| 91 | } |
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| 92 | |||
| 93 | gameport_close(gameport); |
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| 94 | return 59659 / (tx < 1 ? 1 : tx); |
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| 95 | |||
| 96 | #else |
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| 97 | |||
| 98 | unsigned int j, t = 0; |
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| 99 | |||
| 100 | j = jiffies; while (j == jiffies); |
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| 101 | j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); } |
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| 102 | |||
| 103 | gameport_close(gameport); |
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| 104 | return t * HZ / 1000; |
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| 105 | |||
| 106 | #endif |
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| 107 | } |
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| 108 | |||
| 109 | static void gameport_find_dev(struct gameport *gameport) |
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| 110 | { |
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| 111 | struct gameport_dev *dev; |
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| 112 | |||
| 113 | list_for_each_entry(dev, &gameport_dev_list, node) { |
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| 114 | if (gameport->dev) |
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| 115 | break; |
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| 116 | if (dev->connect) |
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| 117 | dev->connect(gameport, dev); |
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| 118 | } |
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| 119 | } |
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| 120 | |||
| 121 | void gameport_rescan(struct gameport *gameport) |
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| 122 | { |
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| 123 | gameport_close(gameport); |
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| 124 | gameport_find_dev(gameport); |
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| 125 | } |
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| 126 | |||
| 127 | void gameport_register_port(struct gameport *gameport) |
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| 128 | { |
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| 129 | list_add_tail(&gameport->node, &gameport_list); |
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| 130 | gameport->speed = gameport_measure_speed(gameport); |
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| 131 | gameport_find_dev(gameport); |
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| 132 | } |
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| 133 | |||
| 134 | void gameport_unregister_port(struct gameport *gameport) |
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| 135 | { |
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| 136 | list_del_init(&gameport->node); |
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| 137 | if (gameport->dev && gameport->dev->disconnect) |
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| 138 | gameport->dev->disconnect(gameport); |
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| 139 | } |
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| 140 | |||
| 141 | void gameport_register_device(struct gameport_dev *dev) |
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| 142 | { |
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| 143 | struct gameport *gameport; |
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| 144 | |||
| 145 | list_add_tail(&dev->node, &gameport_dev_list); |
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| 146 | list_for_each_entry(gameport, &gameport_list, node) |
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| 147 | if (!gameport->dev && dev->connect) |
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| 148 | dev->connect(gameport, dev); |
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| 149 | } |
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| 150 | |||
| 151 | void gameport_unregister_device(struct gameport_dev *dev) |
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| 152 | { |
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| 153 | struct gameport *gameport; |
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| 154 | |||
| 155 | list_del_init(&dev->node); |
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| 156 | list_for_each_entry(gameport, &gameport_list, node) { |
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| 157 | if (gameport->dev == dev && dev->disconnect) |
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| 158 | dev->disconnect(gameport); |
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| 159 | gameport_find_dev(gameport); |
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| 160 | } |
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| 161 | } |
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| 162 | |||
| 163 | int gameport_open(struct gameport *gameport, struct gameport_dev *dev, int mode) |
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| 164 | { |
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| 165 | if (gameport->open) { |
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| 166 | if (gameport->open(gameport, mode)) |
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| 167 | return -1; |
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| 168 | } else { |
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| 169 | if (mode != GAMEPORT_MODE_RAW) |
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| 170 | return -1; |
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| 171 | } |
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| 172 | |||
| 173 | if (gameport->dev) |
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| 174 | return -1; |
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| 175 | |||
| 176 | gameport->dev = dev; |
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| 177 | |||
| 178 | return 0; |
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| 179 | } |
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| 180 | |||
| 181 | void gameport_close(struct gameport *gameport) |
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| 182 | { |
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| 183 | gameport->dev = NULL; |
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| 184 | if (gameport->close) |
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| 185 | gameport->close(gameport); |
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| 186 | } |