drivers/input/gameport/ns558.c

   1 /*
   2  * $Id: ns558.c,v 1.43 2002/01/24 19:23:21 vojtech Exp $
   3  *
   4  *  Copyright (c) 1999-2001 Vojtech Pavlik
   5  *  Copyright (c) 1999 Brian Gerst
   6  */
   7
   8 /*
   9  * NS558 based standard IBM game port driver for Linux
  10  */
  11
  12 /*
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  *
  27  * Should you need to contact me, the author, you can do so either by
  28  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  29  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  30  */
  31
  32 #include <asm/io.h>
  33
  34 #include <linux/module.h>
  35 #include <linux/ioport.h>
  36 #include <linux/config.h>
  37 #include <linux/init.h>
  38 #include <linux/delay.h>
  39 #include <linux/gameport.h>
  40 #include <linux/slab.h>
  41 #include <linux/pnp.h>
  42
  43 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  44 MODULE_DESCRIPTION("Classic gameport (ISA/PnP) driver");
  45 MODULE_LICENSE("GPL");
  46
  47 static int ns558_isa_portlist[] = { 0x201, 0x200, 0x202, 0x203, 0x204, 0x205, 0x207, 0x209,
  48                                     0x20b, 0x20c, 0x20e, 0x20f, 0x211, 0x219, 0x101, 0 };
  49
  50 struct ns558 {
  51         int type;
  52         int io;
  53         int size;
  54         struct pnp_dev *dev;
  55         struct gameport *gameport;
  56         struct list_head node;
  57 };
  58
  59 static LIST_HEAD(ns558_list);
  60
  61 /*
  62  * ns558_isa_probe() tries to find an isa gameport at the
  63  * specified address, and also checks for mirrors.
  64  * A joystick must be attached for this to work.
  65  */
  66
  67 static int ns558_isa_probe(int io)
  68 {
  69         int i, j, b;
  70         unsigned char c, u, v;
  71         struct ns558 *ns558;
  72         struct gameport *port;
  73
  74 /*
  75  * No one should be using this address.
  76  */
  77
  78         if (!request_region(io, 1, "ns558-isa"))
  79                 return -EBUSY;
  80
  81 /*
  82  * We must not be able to write arbitrary values to the port.
  83  * The lower two axis bits must be 1 after a write.
  84  */
  85
  86         c = inb(io);
  87         outb(~c & ~3, io);
  88         if (~(u = v = inb(io)) & 3) {
  89                 outb(c, io);
  90                 release_region(io, 1);
  91                 return -ENODEV;
  92         }
  93 /*
  94  * After a trigger, there must be at least some bits changing.
  95  */
  96
  97         for (i = 0; i < 1000; i++) v &= inb(io);
  98
  99         if (u == v) {
 100                 outb(c, io);
 101                 release_region(io, 1);
 102                 return -ENODEV;
 103         }
 104         msleep(3);
 105 /*
 106  * After some time (4ms) the axes shouldn't change anymore.
 107  */
 108
 109         u = inb(io);
 110         for (i = 0; i < 1000; i++)
 111                 if ((u ^ inb(io)) & 0xf) {
 112                         outb(c, io);
 113                         release_region(io, 1);
 114                         return -ENODEV;
 115                 }
 116 /*
 117  * And now find the number of mirrors of the port.
 118  */
 119
 120         for (i = 1; i < 5; i++) {
 121
 122                 release_region(io & (-1 << (i - 1)), (1 << (i - 1)));
 123
 124                 if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))
 125                         break;                          /* Don't disturb anyone */
 126
 127                 outb(0xff, io & (-1 << i));
 128                 for (j = b = 0; j < 1000; j++)
 129                         if (inb(io & (-1 << i)) != inb((io & (-1 << i)) + (1 << i) - 1)) b++;
 130                 msleep(3);
 131
 132                 if (b > 300) {                          /* We allow 30% difference */
 133                         release_region(io & (-1 << i), (1 << i));
 134                         break;
 135                 }
 136         }
 137
 138         i--;
 139
 140         if (i != 4) {
 141                 if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))
 142                         return -EBUSY;
 143         }
 144
 145         ns558 = kcalloc(1, sizeof(struct ns558), GFP_KERNEL);
 146         port = gameport_allocate_port();
 147         if (!ns558 || !port) {
 148                 printk(KERN_ERR "ns558: Memory allocation failed.\n");
 149                 release_region(io & (-1 << i), (1 << i));
 150                 kfree(ns558);
 151                 gameport_free_port(port);
 152                 return -ENOMEM;
 153         }
 154
 155         memset(ns558, 0, sizeof(struct ns558));
 156         ns558->io = io;
 157         ns558->size = 1 << i;
 158         ns558->gameport = port;
 159
 160         port->io = io;
 161         gameport_set_name(port, "NS558 ISA Gameport");
 162         gameport_set_phys(port, "isa%04x/gameport0", io & (-1 << i));
 163
 164         gameport_register_port(port);
 165
 166         list_add(&ns558->node, &ns558_list);
 167
 168         return 0;
 169 }
 170
 171 #ifdef CONFIG_PNP
 172
 173 static struct pnp_device_id pnp_devids[] = {
 174         { .id = "@P@0001", .driver_data = 0 }, /* ALS 100 */
 175         { .id = "@P@0020", .driver_data = 0 }, /* ALS 200 */
 176         { .id = "@P@1001", .driver_data = 0 }, /* ALS 100+ */
 177         { .id = "@P@2001", .driver_data = 0 }, /* ALS 120 */
 178         { .id = "ASB16fd", .driver_data = 0 }, /* AdLib NSC16 */
 179         { .id = "AZT3001", .driver_data = 0 }, /* AZT1008 */
 180         { .id = "CDC0001", .driver_data = 0 }, /* Opl3-SAx */
 181         { .id = "CSC0001", .driver_data = 0 }, /* CS4232 */
 182         { .id = "CSC000f", .driver_data = 0 }, /* CS4236 */
 183         { .id = "CSC0101", .driver_data = 0 }, /* CS4327 */
 184         { .id = "CTL7001", .driver_data = 0 }, /* SB16 */
 185         { .id = "CTL7002", .driver_data = 0 }, /* AWE64 */
 186         { .id = "CTL7005", .driver_data = 0 }, /* Vibra16 */
 187         { .id = "ENS2020", .driver_data = 0 }, /* SoundscapeVIVO */
 188         { .id = "ESS0001", .driver_data = 0 }, /* ES1869 */
 189         { .id = "ESS0005", .driver_data = 0 }, /* ES1878 */
 190         { .id = "ESS6880", .driver_data = 0 }, /* ES688 */
 191         { .id = "IBM0012", .driver_data = 0 }, /* CS4232 */
 192         { .id = "OPT0001", .driver_data = 0 }, /* OPTi Audio16 */
 193         { .id = "YMH0006", .driver_data = 0 }, /* Opl3-SA */
 194         { .id = "YMH0022", .driver_data = 0 }, /* Opl3-SAx */
 195         { .id = "PNPb02f", .driver_data = 0 }, /* Generic */
 196         { .id = "", },
 197 };
 198
 199 MODULE_DEVICE_TABLE(pnp, pnp_devids);
 200
 201 static int ns558_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *did)
 202 {
 203         int ioport, iolen;
 204         struct ns558 *ns558;
 205         struct gameport *port;
 206
 207         if (!pnp_port_valid(dev, 0)) {
 208                 printk(KERN_WARNING "ns558: No i/o ports on a gameport? Weird\n");
 209                 return -ENODEV;
 210         }
 211
 212         ioport = pnp_port_start(dev, 0);
 213         iolen = pnp_port_len(dev, 0);
 214
 215         if (!request_region(ioport, iolen, "ns558-pnp"))
 216                 return -EBUSY;
 217
 218         ns558 = kcalloc(1, sizeof(struct ns558), GFP_KERNEL);
 219         port = gameport_allocate_port();
 220         if (!ns558 || !port) {
 221                 printk(KERN_ERR "ns558: Memory allocation failed\n");
 222                 kfree(ns558);
 223                 gameport_free_port(port);
 224                 return -ENOMEM;
 225         }
 226
 227         ns558->io = ioport;
 228         ns558->size = iolen;
 229         ns558->dev = dev;
 230         ns558->gameport = port;
 231
 232         gameport_set_name(port, "NS558 PnP Gameport");
 233         gameport_set_phys(port, "pnp%s/gameport0", dev->dev.bus_id);
 234         port->dev.parent = &dev->dev;
 235         port->io = ioport;
 236
 237         gameport_register_port(port);
 238
 239         list_add_tail(&ns558->node, &ns558_list);
 240         return 0;
 241 }
 242
 243 static struct pnp_driver ns558_pnp_driver = {
 244         .name           = "ns558",
 245         .id_table       = pnp_devids,
 246         .probe          = ns558_pnp_probe,
 247 };
 248
 249 #else
 250
 251 static struct pnp_driver ns558_pnp_driver;
 252
 253 #endif
 254
 255 static int pnp_registered = 0;
 256
 257 static int __init ns558_init(void)
 258 {
 259         int i = 0;
 260
 261 /*
 262  * Probe ISA ports first so that PnP gets to choose free port addresses
 263  * not occupied by the ISA ports.
 264  */
 265
 266         while (ns558_isa_portlist[i])
 267                 ns558_isa_probe(ns558_isa_portlist[i++]);
 268
 269         if (pnp_register_driver(&ns558_pnp_driver) >= 0)
 270                 pnp_registered = 1;
 271
 272
 273         return (list_empty(&ns558_list) && !pnp_registered) ? -ENODEV : 0;
 274 }
 275
 276 static void __exit ns558_exit(void)
 277 {
 278         struct ns558 *ns558;
 279
 280         list_for_each_entry(ns558, &ns558_list, node) {
 281                 gameport_unregister_port(ns558->gameport);
 282                 release_region(ns558->io & ~(ns558->size - 1), ns558->size);
 283                 kfree(ns558);
 284         }
 285
 286         if (pnp_registered)
 287                 pnp_unregister_driver(&ns558_pnp_driver);
 288 }
 289
 290 module_init(ns558_init);
 291 module_exit(ns558_exit);