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/init.h>
  37 #include <linux/delay.h>
  38 #include <linux/gameport.h>
  39 #include <linux/slab.h>
  40 #include <linux/pnp.h>
  41
  42 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  43 MODULE_DESCRIPTION("Classic gameport (ISA/PnP) driver");
  44 MODULE_LICENSE("GPL");
  45
  46 static int ns558_isa_portlist[] = { 0x201, 0x200, 0x202, 0x203, 0x204, 0x205, 0x207, 0x209,
  47                                     0x20b, 0x20c, 0x20e, 0x20f, 0x211, 0x219, 0x101, 0 };
  48
  49 struct ns558 {
  50         int type;
  51         int io;
  52         int size;
  53         struct pnp_dev *dev;
  54         struct gameport *gameport;
  55         struct list_head node;
  56 };
  57
  58 static LIST_HEAD(ns558_list);
  59
  60 /*
  61  * ns558_isa_probe() tries to find an isa gameport at the
  62  * specified address, and also checks for mirrors.
  63  * A joystick must be attached for this to work.
  64  */
  65
  66 static int ns558_isa_probe(int io)
  67 {
  68         int i, j, b;
  69         unsigned char c, u, v;
  70         struct ns558 *ns558;
  71         struct gameport *port;
  72
  73 /*
  74  * No one should be using this address.
  75  */
  76
  77         if (!request_region(io, 1, "ns558-isa"))
  78                 return -EBUSY;
  79
  80 /*
  81  * We must not be able to write arbitrary values to the port.
  82  * The lower two axis bits must be 1 after a write.
  83  */
  84
  85         c = inb(io);
  86         outb(~c & ~3, io);
  87         if (~(u = v = inb(io)) & 3) {
  88                 outb(c, io);
  89                 release_region(io, 1);
  90                 return -ENODEV;
  91         }
  92 /*
  93  * After a trigger, there must be at least some bits changing.
  94  */
  95
  96         for (i = 0; i < 1000; i++) v &= inb(io);
  97
  98         if (u == v) {
  99                 outb(c, io);
 100                 release_region(io, 1);
 101                 return -ENODEV;
 102         }
 103         msleep(3);
 104 /*
 105  * After some time (4ms) the axes shouldn't change anymore.
 106  */
 107
 108         u = inb(io);
 109         for (i = 0; i < 1000; i++)
 110                 if ((u ^ inb(io)) & 0xf) {
 111                         outb(c, io);
 112                         release_region(io, 1);
 113                         return -ENODEV;
 114                 }
 115 /*
 116  * And now find the number of mirrors of the port.
 117  */
 118
 119         for (i = 1; i < 5; i++) {
 120
 121                 release_region(io & (-1 << (i - 1)), (1 << (i - 1)));
 122
 123                 if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))
 124                         break;                          /* Don't disturb anyone */
 125
 126                 outb(0xff, io & (-1 << i));
 127                 for (j = b = 0; j < 1000; j++)
 128                         if (inb(io & (-1 << i)) != inb((io & (-1 << i)) + (1 << i) - 1)) b++;
 129                 msleep(3);
 130
 131                 if (b > 300) {                          /* We allow 30% difference */
 132                         release_region(io & (-1 << i), (1 << i));
 133                         break;
 134                 }
 135         }
 136
 137         i--;
 138
 139         if (i != 4) {
 140                 if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))
 141                         return -EBUSY;
 142         }
 143
 144         ns558 = kzalloc(sizeof(struct ns558), GFP_KERNEL);
 145         port = gameport_allocate_port();
 146         if (!ns558 || !port) {
 147                 printk(KERN_ERR "ns558: Memory allocation failed.\n");
 148                 release_region(io & (-1 << i), (1 << i));
 149                 kfree(ns558);
 150                 gameport_free_port(port);
 151                 return -ENOMEM;
 152         }
 153
 154         ns558->io = io;
 155         ns558->size = 1 << i;
 156         ns558->gameport = port;
 157
 158         port->io = io;
 159         gameport_set_name(port, "NS558 ISA Gameport");
 160         gameport_set_phys(port, "isa%04x/gameport0", io & (-1 << i));
 161
 162         gameport_register_port(port);
 163
 164         list_add(&ns558->node, &ns558_list);
 165
 166         return 0;
 167 }
 168
 169 #ifdef CONFIG_PNP
 170
 171 static struct pnp_device_id pnp_devids[] = {
 172         { .id = "@P@0001", .driver_data = 0 }, /* ALS 100 */
 173         { .id = "@P@0020", .driver_data = 0 }, /* ALS 200 */
 174         { .id = "@P@1001", .driver_data = 0 }, /* ALS 100+ */
 175         { .id = "@P@2001", .driver_data = 0 }, /* ALS 120 */
 176         { .id = "ASB16fd", .driver_data = 0 }, /* AdLib NSC16 */
 177         { .id = "AZT3001", .driver_data = 0 }, /* AZT1008 */
 178         { .id = "CDC0001", .driver_data = 0 }, /* Opl3-SAx */
 179         { .id = "CSC0001", .driver_data = 0 }, /* CS4232 */
 180         { .id = "CSC000f", .driver_data = 0 }, /* CS4236 */
 181         { .id = "CSC0101", .driver_data = 0 }, /* CS4327 */
 182         { .id = "CTL7001", .driver_data = 0 }, /* SB16 */
 183         { .id = "CTL7002", .driver_data = 0 }, /* AWE64 */
 184         { .id = "CTL7005", .driver_data = 0 }, /* Vibra16 */
 185         { .id = "ENS2020", .driver_data = 0 }, /* SoundscapeVIVO */
 186         { .id = "ESS0001", .driver_data = 0 }, /* ES1869 */
 187         { .id = "ESS0005", .driver_data = 0 }, /* ES1878 */
 188         { .id = "ESS6880", .driver_data = 0 }, /* ES688 */
 189         { .id = "IBM0012", .driver_data = 0 }, /* CS4232 */
 190         { .id = "OPT0001", .driver_data = 0 }, /* OPTi Audio16 */
 191         { .id = "YMH0006", .driver_data = 0 }, /* Opl3-SA */
 192         { .id = "YMH0022", .driver_data = 0 }, /* Opl3-SAx */
 193         { .id = "PNPb02f", .driver_data = 0 }, /* Generic */
 194         { .id = "", },
 195 };
 196
 197 MODULE_DEVICE_TABLE(pnp, pnp_devids);
 198
 199 static int ns558_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *did)
 200 {
 201         int ioport, iolen;
 202         struct ns558 *ns558;
 203         struct gameport *port;
 204
 205         if (!pnp_port_valid(dev, 0)) {
 206                 printk(KERN_WARNING "ns558: No i/o ports on a gameport? Weird\n");
 207                 return -ENODEV;
 208         }
 209
 210         ioport = pnp_port_start(dev, 0);
 211         iolen = pnp_port_len(dev, 0);
 212
 213         if (!request_region(ioport, iolen, "ns558-pnp"))
 214                 return -EBUSY;
 215
 216         ns558 = kzalloc(sizeof(struct ns558), GFP_KERNEL);
 217         port = gameport_allocate_port();
 218         if (!ns558 || !port) {
 219                 printk(KERN_ERR "ns558: Memory allocation failed\n");
 220                 kfree(ns558);
 221                 gameport_free_port(port);
 222                 return -ENOMEM;
 223         }
 224
 225         ns558->io = ioport;
 226         ns558->size = iolen;
 227         ns558->dev = dev;
 228         ns558->gameport = port;
 229
 230         gameport_set_name(port, "NS558 PnP Gameport");
 231         gameport_set_phys(port, "pnp%s/gameport0", dev->dev.bus_id);
 232         port->dev.parent = &dev->dev;
 233         port->io = ioport;
 234
 235         gameport_register_port(port);
 236
 237         list_add_tail(&ns558->node, &ns558_list);
 238         return 0;
 239 }
 240
 241 static struct pnp_driver ns558_pnp_driver = {
 242         .name           = "ns558",
 243         .id_table       = pnp_devids,
 244         .probe          = ns558_pnp_probe,
 245 };
 246
 247 #else
 248
 249 static struct pnp_driver ns558_pnp_driver;
 250
 251 #endif
 252
 253 static int __init ns558_init(void)
 254 {
 255         int i = 0;
 256         int error;
 257
 258         error = pnp_register_driver(&ns558_pnp_driver);
 259         if (error && error != -ENODEV)  /* should be ENOSYS really */
 260                 return error;
 261
 262 /*
 263  * Probe ISA ports after PnP, so that PnP ports that are already
 264  * enabled get detected as PnP. This may be suboptimal in multi-device
 265  * configurations, but saves hassle with simple setups.
 266  */
 267
 268         while (ns558_isa_portlist[i])
 269                 ns558_isa_probe(ns558_isa_portlist[i++]);
 270
 271         return list_empty(&ns558_list) && error ? -ENODEV : 0;
 272 }
 273
 274 static void __exit ns558_exit(void)
 275 {
 276         struct ns558 *ns558, *safe;
 277
 278         list_for_each_entry_safe(ns558, safe, &ns558_list, node) {
 279                 gameport_unregister_port(ns558->gameport);
 280                 release_region(ns558->io & ~(ns558->size - 1), ns558->size);
 281                 kfree(ns558);
 282         }
 283
 284         pnp_unregister_driver(&ns558_pnp_driver);
 285 }
 286
 287 module_init(ns558_init);
 288 module_exit(ns558_exit);