linux/drivers/input/gameport/ns558.c
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   1/*
   2 *  Copyright (c) 1999-2001 Vojtech Pavlik
   3 *  Copyright (c) 1999 Brian Gerst
   4 */
   5
   6/*
   7 * NS558 based standard IBM game port driver for Linux
   8 */
   9
  10/*
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or
  14 * (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24 *
  25 * Should you need to contact me, the author, you can do so either by
  26 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  27 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  28 */
  29
  30#include <asm/io.h>
  31
  32#include <linux/module.h>
  33#include <linux/ioport.h>
  34#include <linux/init.h>
  35#include <linux/delay.h>
  36#include <linux/gameport.h>
  37#include <linux/slab.h>
  38#include <linux/pnp.h>
  39
  40MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  41MODULE_DESCRIPTION("Classic gameport (ISA/PnP) driver");
  42MODULE_LICENSE("GPL");
  43
  44static int ns558_isa_portlist[] = { 0x201, 0x200, 0x202, 0x203, 0x204, 0x205, 0x207, 0x209,
  45                                    0x20b, 0x20c, 0x20e, 0x20f, 0x211, 0x219, 0x101, 0 };
  46
  47struct ns558 {
  48        int type;
  49        int io;
  50        int size;
  51        struct pnp_dev *dev;
  52        struct gameport *gameport;
  53        struct list_head node;
  54};
  55
  56static LIST_HEAD(ns558_list);
  57
  58/*
  59 * ns558_isa_probe() tries to find an isa gameport at the
  60 * specified address, and also checks for mirrors.
  61 * A joystick must be attached for this to work.
  62 */
  63
  64static int ns558_isa_probe(int io)
  65{
  66        int i, j, b;
  67        unsigned char c, u, v;
  68        struct ns558 *ns558;
  69        struct gameport *port;
  70
  71/*
  72 * No one should be using this address.
  73 */
  74
  75        if (!request_region(io, 1, "ns558-isa"))
  76                return -EBUSY;
  77
  78/*
  79 * We must not be able to write arbitrary values to the port.
  80 * The lower two axis bits must be 1 after a write.
  81 */
  82
  83        c = inb(io);
  84        outb(~c & ~3, io);
  85        if (~(u = v = inb(io)) & 3) {
  86                outb(c, io);
  87                release_region(io, 1);
  88                return -ENODEV;
  89        }
  90/*
  91 * After a trigger, there must be at least some bits changing.
  92 */
  93
  94        for (i = 0; i < 1000; i++) v &= inb(io);
  95
  96        if (u == v) {
  97                outb(c, io);
  98                release_region(io, 1);
  99                return -ENODEV;
 100        }
 101        msleep(3);
 102/*
 103 * After some time (4ms) the axes shouldn't change anymore.
 104 */
 105
 106        u = inb(io);
 107        for (i = 0; i < 1000; i++)
 108                if ((u ^ inb(io)) & 0xf) {
 109                        outb(c, io);
 110                        release_region(io, 1);
 111                        return -ENODEV;
 112                }
 113/*
 114 * And now find the number of mirrors of the port.
 115 */
 116
 117        for (i = 1; i < 5; i++) {
 118
 119                release_region(io & (-1 << (i - 1)), (1 << (i - 1)));
 120
 121                if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))
 122                        break;                          /* Don't disturb anyone */
 123
 124                outb(0xff, io & (-1 << i));
 125                for (j = b = 0; j < 1000; j++)
 126                        if (inb(io & (-1 << i)) != inb((io & (-1 << i)) + (1 << i) - 1)) b++;
 127                msleep(3);
 128
 129                if (b > 300) {                          /* We allow 30% difference */
 130                        release_region(io & (-1 << i), (1 << i));
 131                        break;
 132                }
 133        }
 134
 135        i--;
 136
 137        if (i != 4) {
 138                if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))
 139                        return -EBUSY;
 140        }
 141
 142        ns558 = kzalloc(sizeof(struct ns558), GFP_KERNEL);
 143        port = gameport_allocate_port();
 144        if (!ns558 || !port) {
 145                printk(KERN_ERR "ns558: Memory allocation failed.\n");
 146                release_region(io & (-1 << i), (1 << i));
 147                kfree(ns558);
 148                gameport_free_port(port);
 149                return -ENOMEM;
 150        }
 151
 152        ns558->io = io;
 153        ns558->size = 1 << i;
 154        ns558->gameport = port;
 155
 156        port->io = io;
 157        gameport_set_name(port, "NS558 ISA Gameport");
 158        gameport_set_phys(port, "isa%04x/gameport0", io & (-1 << i));
 159
 160        gameport_register_port(port);
 161
 162        list_add(&ns558->node, &ns558_list);
 163
 164        return 0;
 165}
 166
 167#ifdef CONFIG_PNP
 168
 169static const struct pnp_device_id pnp_devids[] = {
 170        { .id = "@P@0001", .driver_data = 0 }, /* ALS 100 */
 171        { .id = "@P@0020", .driver_data = 0 }, /* ALS 200 */
 172        { .id = "@P@1001", .driver_data = 0 }, /* ALS 100+ */
 173        { .id = "@P@2001", .driver_data = 0 }, /* ALS 120 */
 174        { .id = "ASB16fd", .driver_data = 0 }, /* AdLib NSC16 */
 175        { .id = "AZT3001", .driver_data = 0 }, /* AZT1008 */
 176        { .id = "CDC0001", .driver_data = 0 }, /* Opl3-SAx */
 177        { .id = "CSC0001", .driver_data = 0 }, /* CS4232 */
 178        { .id = "CSC000f", .driver_data = 0 }, /* CS4236 */
 179        { .id = "CSC0101", .driver_data = 0 }, /* CS4327 */
 180        { .id = "CTL7001", .driver_data = 0 }, /* SB16 */
 181        { .id = "CTL7002", .driver_data = 0 }, /* AWE64 */
 182        { .id = "CTL7005", .driver_data = 0 }, /* Vibra16 */
 183        { .id = "ENS2020", .driver_data = 0 }, /* SoundscapeVIVO */
 184        { .id = "ESS0001", .driver_data = 0 }, /* ES1869 */
 185        { .id = "ESS0005", .driver_data = 0 }, /* ES1878 */
 186        { .id = "ESS6880", .driver_data = 0 }, /* ES688 */
 187        { .id = "IBM0012", .driver_data = 0 }, /* CS4232 */
 188        { .id = "OPT0001", .driver_data = 0 }, /* OPTi Audio16 */
 189        { .id = "YMH0006", .driver_data = 0 }, /* Opl3-SA */
 190        { .id = "YMH0022", .driver_data = 0 }, /* Opl3-SAx */
 191        { .id = "PNPb02f", .driver_data = 0 }, /* Generic */
 192        { .id = "", },
 193};
 194
 195MODULE_DEVICE_TABLE(pnp, pnp_devids);
 196
 197static int ns558_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *did)
 198{
 199        int ioport, iolen;
 200        struct ns558 *ns558;
 201        struct gameport *port;
 202
 203        if (!pnp_port_valid(dev, 0)) {
 204                printk(KERN_WARNING "ns558: No i/o ports on a gameport? Weird\n");
 205                return -ENODEV;
 206        }
 207
 208        ioport = pnp_port_start(dev, 0);
 209        iolen = pnp_port_len(dev, 0);
 210
 211        if (!request_region(ioport, iolen, "ns558-pnp"))
 212                return -EBUSY;
 213
 214        ns558 = kzalloc(sizeof(struct ns558), GFP_KERNEL);
 215        port = gameport_allocate_port();
 216        if (!ns558 || !port) {
 217                printk(KERN_ERR "ns558: Memory allocation failed\n");
 218                kfree(ns558);
 219                gameport_free_port(port);
 220                return -ENOMEM;
 221        }
 222
 223        ns558->io = ioport;
 224        ns558->size = iolen;
 225        ns558->dev = dev;
 226        ns558->gameport = port;
 227
 228        gameport_set_name(port, "NS558 PnP Gameport");
 229        gameport_set_phys(port, "pnp%s/gameport0", dev_name(&dev->dev));
 230        port->dev.parent = &dev->dev;
 231        port->io = ioport;
 232
 233        gameport_register_port(port);
 234
 235        list_add_tail(&ns558->node, &ns558_list);
 236        return 0;
 237}
 238
 239static struct pnp_driver ns558_pnp_driver = {
 240        .name           = "ns558",
 241        .id_table       = pnp_devids,
 242        .probe          = ns558_pnp_probe,
 243};
 244
 245#else
 246
 247static struct pnp_driver ns558_pnp_driver;
 248
 249#endif
 250
 251static int __init ns558_init(void)
 252{
 253        int i = 0;
 254        int error;
 255
 256        error = pnp_register_driver(&ns558_pnp_driver);
 257        if (error && error != -ENODEV)  /* should be ENOSYS really */
 258                return error;
 259
 260/*
 261 * Probe ISA ports after PnP, so that PnP ports that are already
 262 * enabled get detected as PnP. This may be suboptimal in multi-device
 263 * configurations, but saves hassle with simple setups.
 264 */
 265
 266        while (ns558_isa_portlist[i])
 267                ns558_isa_probe(ns558_isa_portlist[i++]);
 268
 269        return list_empty(&ns558_list) && error ? -ENODEV : 0;
 270}
 271
 272static void __exit ns558_exit(void)
 273{
 274        struct ns558 *ns558, *safe;
 275
 276        list_for_each_entry_safe(ns558, safe, &ns558_list, node) {
 277                gameport_unregister_port(ns558->gameport);
 278                release_region(ns558->io & ~(ns558->size - 1), ns558->size);
 279                kfree(ns558);
 280        }
 281
 282        pnp_unregister_driver(&ns558_pnp_driver);
 283}
 284
 285module_init(ns558_init);
 286module_exit(ns558_exit);
 287
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