drivers/input/gameport/ns558.c

   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
  26 #include <asm/io.h>
  27
  28 #include <linux/module.h>
  29 #include <linux/ioport.h>
  30 #include <linux/init.h>
  31 #include <linux/delay.h>
  32 #include <linux/gameport.h>
  33 #include <linux/slab.h>
  34 #include <linux/pnp.h>
  35
  36 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  37 MODULE_DESCRIPTION("Classic gameport (ISA/PnP) driver");
  38 MODULE_LICENSE("GPL");
  39
  40 static int ns558_isa_portlist[] = { 0x201, 0x200, 0x202, 0x203, 0x204, 0x205, 0x207, 0x209,
  41                                     0x20b, 0x20c, 0x20e, 0x20f, 0x211, 0x219, 0x101, 0 };
  42
  43 struct ns558 {
  44         int type;
  45         int io;
  46         int size;
  47         struct pnp_dev *dev;
  48         struct gameport *gameport;
  49         struct list_head node;
  50 };
  51
  52 static LIST_HEAD(ns558_list);
  53
  54 /*
  55  * ns558_isa_probe() tries to find an isa gameport at the
  56  * specified address, and also checks for mirrors.
  57  * A joystick must be attached for this to work.
  58  */
  59
  60 static int ns558_isa_probe(int io)
  61 {
  62         int i, j, b;
  63         unsigned char c, u, v;
  64         struct ns558 *ns558;
  65         struct gameport *port;
  66
  67 /*
  68  * No one should be using this address.
  69  */
  70
  71         if (!request_region(io, 1, "ns558-isa"))
  72                 return -EBUSY;
  73
  74 /*
  75  * We must not be able to write arbitrary values to the port.
  76  * The lower two axis bits must be 1 after a write.
  77  */
  78
  79         c = inb(io);
  80         outb(~c & ~3, io);
  81         if (~(u = v = inb(io)) & 3) {
  82                 outb(c, io);
  83                 release_region(io, 1);
  84                 return -ENODEV;
  85         }
  86 /*
  87  * After a trigger, there must be at least some bits changing.
  88  */
  89
  90         for (i = 0; i < 1000; i++) v &= inb(io);
  91
  92         if (u == v) {
  93                 outb(c, io);
  94                 release_region(io, 1);
  95                 return -ENODEV;
  96         }
  97         msleep(3);
  98 /*
  99  * After some time (4ms) the axes shouldn't change anymore.
 100  */
 101
 102         u = inb(io);
 103         for (i = 0; i < 1000; i++)
 104                 if ((u ^ inb(io)) & 0xf) {
 105                         outb(c, io);
 106                         release_region(io, 1);
 107                         return -ENODEV;
 108                 }
 109 /*
 110  * And now find the number of mirrors of the port.
 111  */
 112
 113         for (i = 1; i < 5; i++) {
 114
 115                 release_region(io & (-1 << (i - 1)), (1 << (i - 1)));
 116
 117                 if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))
 118                         break;                          /* Don't disturb anyone */
 119
 120                 outb(0xff, io & (-1 << i));
 121                 for (j = b = 0; j < 1000; j++)
 122                         if (inb(io & (-1 << i)) != inb((io & (-1 << i)) + (1 << i) - 1)) b++;
 123                 msleep(3);
 124
 125                 if (b > 300) {                          /* We allow 30% difference */
 126                         release_region(io & (-1 << i), (1 << i));
 127                         break;
 128                 }
 129         }
 130
 131         i--;
 132
 133         if (i != 4) {
 134                 if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))
 135                         return -EBUSY;
 136         }
 137
 138         ns558 = kzalloc(sizeof(struct ns558), GFP_KERNEL);
 139         port = gameport_allocate_port();
 140         if (!ns558 || !port) {
 141                 printk(KERN_ERR "ns558: Memory allocation failed.\n");
 142                 release_region(io & (-1 << i), (1 << i));
 143                 kfree(ns558);
 144                 gameport_free_port(port);
 145                 return -ENOMEM;
 146         }
 147
 148         ns558->io = io;
 149         ns558->size = 1 << i;
 150         ns558->gameport = port;
 151
 152         port->io = io;
 153         gameport_set_name(port, "NS558 ISA Gameport");
 154         gameport_set_phys(port, "isa%04x/gameport0", io & (-1 << i));
 155
 156         gameport_register_port(port);
 157
 158         list_add(&ns558->node, &ns558_list);
 159
 160         return 0;
 161 }
 162
 163 #ifdef CONFIG_PNP
 164
 165 static const struct pnp_device_id pnp_devids[] = {
 166         { .id = "@P@0001", .driver_data = 0 }, /* ALS 100 */
 167         { .id = "@P@0020", .driver_data = 0 }, /* ALS 200 */
 168         { .id = "@P@1001", .driver_data = 0 }, /* ALS 100+ */
 169         { .id = "@P@2001", .driver_data = 0 }, /* ALS 120 */
 170         { .id = "ASB16fd", .driver_data = 0 }, /* AdLib NSC16 */
 171         { .id = "AZT3001", .driver_data = 0 }, /* AZT1008 */
 172         { .id = "CDC0001", .driver_data = 0 }, /* Opl3-SAx */
 173         { .id = "CSC0001", .driver_data = 0 }, /* CS4232 */
 174         { .id = "CSC000f", .driver_data = 0 }, /* CS4236 */
 175         { .id = "CSC0101", .driver_data = 0 }, /* CS4327 */
 176         { .id = "CTL7001", .driver_data = 0 }, /* SB16 */
 177         { .id = "CTL7002", .driver_data = 0 }, /* AWE64 */
 178         { .id = "CTL7005", .driver_data = 0 }, /* Vibra16 */
 179         { .id = "ENS2020", .driver_data = 0 }, /* SoundscapeVIVO */
 180         { .id = "ESS0001", .driver_data = 0 }, /* ES1869 */
 181         { .id = "ESS0005", .driver_data = 0 }, /* ES1878 */
 182         { .id = "ESS6880", .driver_data = 0 }, /* ES688 */
 183         { .id = "IBM0012", .driver_data = 0 }, /* CS4232 */
 184         { .id = "OPT0001", .driver_data = 0 }, /* OPTi Audio16 */
 185         { .id = "YMH0006", .driver_data = 0 }, /* Opl3-SA */
 186         { .id = "YMH0022", .driver_data = 0 }, /* Opl3-SAx */
 187         { .id = "PNPb02f", .driver_data = 0 }, /* Generic */
 188         { .id = "", },
 189 };
 190
 191 MODULE_DEVICE_TABLE(pnp, pnp_devids);
 192
 193 static int ns558_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *did)
 194 {
 195         int ioport, iolen;
 196         struct ns558 *ns558;
 197         struct gameport *port;
 198
 199         if (!pnp_port_valid(dev, 0)) {
 200                 printk(KERN_WARNING "ns558: No i/o ports on a gameport? Weird\n");
 201                 return -ENODEV;
 202         }
 203
 204         ioport = pnp_port_start(dev, 0);
 205         iolen = pnp_port_len(dev, 0);
 206
 207         if (!request_region(ioport, iolen, "ns558-pnp"))
 208                 return -EBUSY;
 209
 210         ns558 = kzalloc(sizeof(struct ns558), GFP_KERNEL);
 211         port = gameport_allocate_port();
 212         if (!ns558 || !port) {
 213                 printk(KERN_ERR "ns558: Memory allocation failed\n");
 214                 kfree(ns558);
 215                 gameport_free_port(port);
 216                 return -ENOMEM;
 217         }
 218
 219         ns558->io = ioport;
 220         ns558->size = iolen;
 221         ns558->dev = dev;
 222         ns558->gameport = port;
 223
 224         gameport_set_name(port, "NS558 PnP Gameport");
 225         gameport_set_phys(port, "pnp%s/gameport0", dev_name(&dev->dev));
 226         port->dev.parent = &dev->dev;
 227         port->io = ioport;
 228
 229         gameport_register_port(port);
 230
 231         list_add_tail(&ns558->node, &ns558_list);
 232         return 0;
 233 }
 234
 235 static struct pnp_driver ns558_pnp_driver = {
 236         .name           = "ns558",
 237         .id_table       = pnp_devids,
 238         .probe          = ns558_pnp_probe,
 239 };
 240
 241 #else
 242
 243 static struct pnp_driver ns558_pnp_driver;
 244
 245 #endif
 246
 247 static int __init ns558_init(void)
 248 {
 249         int i = 0;
 250         int error;
 251
 252         error = pnp_register_driver(&ns558_pnp_driver);
 253         if (error && error != -ENODEV)  /* should be ENOSYS really */
 254                 return error;
 255
 256 /*
 257  * Probe ISA ports after PnP, so that PnP ports that are already
 258  * enabled get detected as PnP. This may be suboptimal in multi-device
 259  * configurations, but saves hassle with simple setups.
 260  */
 261
 262         while (ns558_isa_portlist[i])
 263                 ns558_isa_probe(ns558_isa_portlist[i++]);
 264
 265         return list_empty(&ns558_list) && error ? -ENODEV : 0;
 266 }
 267
 268 static void __exit ns558_exit(void)
 269 {
 270         struct ns558 *ns558, *safe;
 271
 272         list_for_each_entry_safe(ns558, safe, &ns558_list, node) {
 273                 gameport_unregister_port(ns558->gameport);
 274                 release_region(ns558->io & ~(ns558->size - 1), ns558->size);
 275                 kfree(ns558);
 276         }
 277
 278         pnp_unregister_driver(&ns558_pnp_driver);
 279 }
 280
 281 module_init(ns558_init);
 282 module_exit(ns558_exit);