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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (c) 1999-2001 Vojtech Pavlik4 * Copyright (c) 1999 Brian Gerst5 */6 7/*8 * NS558 based standard IBM game port driver for Linux9 */10 11#include <asm/io.h>12 13#include <linux/module.h>14#include <linux/ioport.h>15#include <linux/init.h>16#include <linux/delay.h>17#include <linux/gameport.h>18#include <linux/slab.h>19#include <linux/pnp.h>20 21MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");22MODULE_DESCRIPTION("Classic gameport (ISA/PnP) driver");23MODULE_LICENSE("GPL");24 25static int ns558_isa_portlist[] = { 0x201, 0x200, 0x202, 0x203, 0x204, 0x205, 0x207, 0x209,26 0x20b, 0x20c, 0x20e, 0x20f, 0x211, 0x219, 0x101, 0 };27 28struct ns558 {29 int type;30 int io;31 int size;32 struct pnp_dev *dev;33 struct gameport *gameport;34 struct list_head node;35};36 37static LIST_HEAD(ns558_list);38 39/*40 * ns558_isa_probe() tries to find an isa gameport at the41 * specified address, and also checks for mirrors.42 * A joystick must be attached for this to work.43 */44 45static int ns558_isa_probe(int io)46{47 int i, j, b;48 unsigned char c, u, v;49 struct ns558 *ns558;50 struct gameport *port;51 52/*53 * No one should be using this address.54 */55 56 if (!request_region(io, 1, "ns558-isa"))57 return -EBUSY;58 59/*60 * We must not be able to write arbitrary values to the port.61 * The lower two axis bits must be 1 after a write.62 */63 64 c = inb(io);65 outb(~c & ~3, io);66 if (~(u = v = inb(io)) & 3) {67 outb(c, io);68 release_region(io, 1);69 return -ENODEV;70 }71/*72 * After a trigger, there must be at least some bits changing.73 */74 75 for (i = 0; i < 1000; i++) v &= inb(io);76 77 if (u == v) {78 outb(c, io);79 release_region(io, 1);80 return -ENODEV;81 }82 msleep(3);83/*84 * After some time (4ms) the axes shouldn't change anymore.85 */86 87 u = inb(io);88 for (i = 0; i < 1000; i++)89 if ((u ^ inb(io)) & 0xf) {90 outb(c, io);91 release_region(io, 1);92 return -ENODEV;93 }94/*95 * And now find the number of mirrors of the port.96 */97 98 for (i = 1; i < 5; i++) {99 100 release_region(io & (-1 << (i - 1)), (1 << (i - 1)));101 102 if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))103 break; /* Don't disturb anyone */104 105 outb(0xff, io & (-1 << i));106 for (j = b = 0; j < 1000; j++)107 if (inb(io & (-1 << i)) != inb((io & (-1 << i)) + (1 << i) - 1)) b++;108 msleep(3);109 110 if (b > 300) { /* We allow 30% difference */111 release_region(io & (-1 << i), (1 << i));112 break;113 }114 }115 116 i--;117 118 if (i != 4) {119 if (!request_region(io & (-1 << i), (1 << i), "ns558-isa"))120 return -EBUSY;121 }122 123 ns558 = kzalloc(sizeof(*ns558), GFP_KERNEL);124 port = gameport_allocate_port();125 if (!ns558 || !port) {126 printk(KERN_ERR "ns558: Memory allocation failed.\n");127 release_region(io & (-1 << i), (1 << i));128 kfree(ns558);129 gameport_free_port(port);130 return -ENOMEM;131 }132 133 ns558->io = io;134 ns558->size = 1 << i;135 ns558->gameport = port;136 137 port->io = io;138 gameport_set_name(port, "NS558 ISA Gameport");139 gameport_set_phys(port, "isa%04x/gameport0", io & (-1 << i));140 141 gameport_register_port(port);142 143 list_add(&ns558->node, &ns558_list);144 145 return 0;146}147 148#ifdef CONFIG_PNP149 150static const struct pnp_device_id pnp_devids[] = {151 { .id = "@P@0001", .driver_data = 0 }, /* ALS 100 */152 { .id = "@P@0020", .driver_data = 0 }, /* ALS 200 */153 { .id = "@P@1001", .driver_data = 0 }, /* ALS 100+ */154 { .id = "@P@2001", .driver_data = 0 }, /* ALS 120 */155 { .id = "ASB16fd", .driver_data = 0 }, /* AdLib NSC16 */156 { .id = "AZT3001", .driver_data = 0 }, /* AZT1008 */157 { .id = "CDC0001", .driver_data = 0 }, /* Opl3-SAx */158 { .id = "CSC0001", .driver_data = 0 }, /* CS4232 */159 { .id = "CSC000f", .driver_data = 0 }, /* CS4236 */160 { .id = "CSC0101", .driver_data = 0 }, /* CS4327 */161 { .id = "CTL7001", .driver_data = 0 }, /* SB16 */162 { .id = "CTL7002", .driver_data = 0 }, /* AWE64 */163 { .id = "CTL7005", .driver_data = 0 }, /* Vibra16 */164 { .id = "ENS2020", .driver_data = 0 }, /* SoundscapeVIVO */165 { .id = "ESS0001", .driver_data = 0 }, /* ES1869 */166 { .id = "ESS0005", .driver_data = 0 }, /* ES1878 */167 { .id = "ESS6880", .driver_data = 0 }, /* ES688 */168 { .id = "IBM0012", .driver_data = 0 }, /* CS4232 */169 { .id = "OPT0001", .driver_data = 0 }, /* OPTi Audio16 */170 { .id = "YMH0006", .driver_data = 0 }, /* Opl3-SA */171 { .id = "YMH0022", .driver_data = 0 }, /* Opl3-SAx */172 { .id = "PNPb02f", .driver_data = 0 }, /* Generic */173 { .id = "", },174};175 176MODULE_DEVICE_TABLE(pnp, pnp_devids);177 178static int ns558_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *did)179{180 int ioport, iolen;181 struct ns558 *ns558;182 struct gameport *port;183 184 if (!pnp_port_valid(dev, 0)) {185 printk(KERN_WARNING "ns558: No i/o ports on a gameport? Weird\n");186 return -ENODEV;187 }188 189 ioport = pnp_port_start(dev, 0);190 iolen = pnp_port_len(dev, 0);191 192 if (!request_region(ioport, iolen, "ns558-pnp"))193 return -EBUSY;194 195 ns558 = kzalloc(sizeof(*ns558), GFP_KERNEL);196 port = gameport_allocate_port();197 if (!ns558 || !port) {198 printk(KERN_ERR "ns558: Memory allocation failed\n");199 kfree(ns558);200 gameport_free_port(port);201 return -ENOMEM;202 }203 204 ns558->io = ioport;205 ns558->size = iolen;206 ns558->dev = dev;207 ns558->gameport = port;208 209 gameport_set_name(port, "NS558 PnP Gameport");210 gameport_set_phys(port, "pnp%s/gameport0", dev_name(&dev->dev));211 port->dev.parent = &dev->dev;212 port->io = ioport;213 214 gameport_register_port(port);215 216 list_add_tail(&ns558->node, &ns558_list);217 return 0;218}219 220static struct pnp_driver ns558_pnp_driver = {221 .name = "ns558",222 .id_table = pnp_devids,223 .probe = ns558_pnp_probe,224};225 226#else227 228static struct pnp_driver ns558_pnp_driver;229 230#endif231 232static int __init ns558_init(void)233{234 int i = 0;235 int error;236 237 error = pnp_register_driver(&ns558_pnp_driver);238 if (error && error != -ENODEV) /* should be ENOSYS really */239 return error;240 241/*242 * Probe ISA ports after PnP, so that PnP ports that are already243 * enabled get detected as PnP. This may be suboptimal in multi-device244 * configurations, but saves hassle with simple setups.245 */246 247 while (ns558_isa_portlist[i])248 ns558_isa_probe(ns558_isa_portlist[i++]);249 250 return list_empty(&ns558_list) && error ? -ENODEV : 0;251}252 253static void __exit ns558_exit(void)254{255 struct ns558 *ns558, *safe;256 257 list_for_each_entry_safe(ns558, safe, &ns558_list, node) {258 gameport_unregister_port(ns558->gameport);259 release_region(ns558->io & ~(ns558->size - 1), ns558->size);260 kfree(ns558);261 }262 263 pnp_unregister_driver(&ns558_pnp_driver);264}265 266module_init(ns558_init);267module_exit(ns558_exit);268