drivers/tty/serial/8250/8250_pnp.c

   1 /*
   2  *  Probe for 8250/16550-type ISAPNP serial ports.
   3  *
   4  *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
   5  *
   6  *  Copyright (C) 2001 Russell King, All Rights Reserved.
   7  *
   8  *  Ported to the Linux PnP Layer - (C) Adam Belay.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License.
  13  */
  14 #include <linux/module.h>
  15 #include <linux/pci.h>
  16 #include <linux/pnp.h>
  17 #include <linux/string.h>
  18 #include <linux/kernel.h>
  19 #include <linux/serial_core.h>
  20 #include <linux/bitops.h>
  21
  22 #include <asm/byteorder.h>
  23
  24 #include "8250.h"
  25
  26 #define UNKNOWN_DEV 0x3000
  27 #define CIR_PORT        0x0800
  28
  29 static const struct pnp_device_id pnp_dev_table[] = {
  30         /* Archtek America Corp. */
  31         /* Archtek SmartLink Modem 3334BT Plug & Play */
  32         {       "AAC000F",              0       },
  33         /* Anchor Datacomm BV */
  34         /* SXPro 144 External Data Fax Modem Plug & Play */
  35         {       "ADC0001",              0       },
  36         /* SXPro 288 External Data Fax Modem Plug & Play */
  37         {       "ADC0002",              0       },
  38         /* PROLiNK 1456VH ISA PnP K56flex Fax Modem */
  39         {       "AEI0250",              0       },
  40         /* Actiontec ISA PNP 56K X2 Fax Modem */
  41         {       "AEI1240",              0       },
  42         /* Rockwell 56K ACF II Fax+Data+Voice Modem */
  43         {       "AKY1021",              0 /*SPCI_FL_NO_SHIRQ*/  },
  44         /*
  45          * ALi Fast Infrared Controller
  46          * Native driver (ali-ircc) is broken so at least
  47          * it can be used with irtty-sir.
  48          */
  49         {       "ALI5123",              0       },
  50         /* AZT3005 PnP SOUND DEVICE */
  51         {       "AZT4001",              0       },
  52         /* Best Data Products Inc. Smart One 336F PnP Modem */
  53         {       "BDP3336",              0       },
  54         /*  Boca Research */
  55         /* Boca Complete Ofc Communicator 14.4 Data-FAX */
  56         {       "BRI0A49",              0       },
  57         /* Boca Research 33,600 ACF Modem */
  58         {       "BRI1400",              0       },
  59         /* Boca 33.6 Kbps Internal FD34FSVD */
  60         {       "BRI3400",              0       },
  61         /* Boca 33.6 Kbps Internal FD34FSVD */
  62         {       "BRI0A49",              0       },
  63         /* Best Data Products Inc. Smart One 336F PnP Modem */
  64         {       "BDP3336",              0       },
  65         /* Computer Peripherals Inc */
  66         /* EuroViVa CommCenter-33.6 SP PnP */
  67         {       "CPI4050",              0       },
  68         /* Creative Labs */
  69         /* Creative Labs Phone Blaster 28.8 DSVD PnP Voice */
  70         {       "CTL3001",              0       },
  71         /* Creative Labs Modem Blaster 28.8 DSVD PnP Voice */
  72         {       "CTL3011",              0       },
  73         /* Davicom ISA 33.6K Modem */
  74         {       "DAV0336",              0       },
  75         /* Creative */
  76         /* Creative Modem Blaster Flash56 DI5601-1 */
  77         {       "DMB1032",              0       },
  78         /* Creative Modem Blaster V.90 DI5660 */
  79         {       "DMB2001",              0       },
  80         /* E-Tech */
  81         /* E-Tech CyberBULLET PC56RVP */
  82         {       "ETT0002",              0       },
  83         /* FUJITSU */
  84         /* Fujitsu 33600 PnP-I2 R Plug & Play */
  85         {       "FUJ0202",              0       },
  86         /* Fujitsu FMV-FX431 Plug & Play */
  87         {       "FUJ0205",              0       },
  88         /* Fujitsu 33600 PnP-I4 R Plug & Play */
  89         {       "FUJ0206",              0       },
  90         /* Fujitsu Fax Voice 33600 PNP-I5 R Plug & Play */
  91         {       "FUJ0209",              0       },
  92         /* Archtek America Corp. */
  93         /* Archtek SmartLink Modem 3334BT Plug & Play */
  94         {       "GVC000F",              0       },
  95         /* Archtek SmartLink Modem 3334BRV 33.6K Data Fax Voice */
  96         {       "GVC0303",              0       },
  97         /* Hayes */
  98         /* Hayes Optima 288 V.34-V.FC + FAX + Voice Plug & Play */
  99         {       "HAY0001",              0       },
 100         /* Hayes Optima 336 V.34 + FAX + Voice PnP */
 101         {       "HAY000C",              0       },
 102         /* Hayes Optima 336B V.34 + FAX + Voice PnP */
 103         {       "HAY000D",              0       },
 104         /* Hayes Accura 56K Ext Fax Modem PnP */
 105         {       "HAY5670",              0       },
 106         /* Hayes Accura 56K Ext Fax Modem PnP */
 107         {       "HAY5674",              0       },
 108         /* Hayes Accura 56K Fax Modem PnP */
 109         {       "HAY5675",              0       },
 110         /* Hayes 288, V.34 + FAX */
 111         {       "HAYF000",              0       },
 112         /* Hayes Optima 288 V.34 + FAX + Voice, Plug & Play */
 113         {       "HAYF001",              0       },
 114         /* IBM */
 115         /* IBM Thinkpad 701 Internal Modem Voice */
 116         {       "IBM0033",              0       },
 117         /* Intermec */
 118         /* Intermec CV60 touchscreen port */
 119         {       "PNP4972",              0       },
 120         /* Intertex */
 121         /* Intertex 28k8 33k6 Voice EXT PnP */
 122         {       "IXDC801",              0       },
 123         /* Intertex 33k6 56k Voice EXT PnP */
 124         {       "IXDC901",              0       },
 125         /* Intertex 28k8 33k6 Voice SP EXT PnP */
 126         {       "IXDD801",              0       },
 127         /* Intertex 33k6 56k Voice SP EXT PnP */
 128         {       "IXDD901",              0       },
 129         /* Intertex 28k8 33k6 Voice SP INT PnP */
 130         {       "IXDF401",              0       },
 131         /* Intertex 28k8 33k6 Voice SP EXT PnP */
 132         {       "IXDF801",              0       },
 133         /* Intertex 33k6 56k Voice SP EXT PnP */
 134         {       "IXDF901",              0       },
 135         /* Kortex International */
 136         /* KORTEX 28800 Externe PnP */
 137         {       "KOR4522",              0       },
 138         /* KXPro 33.6 Vocal ASVD PnP */
 139         {       "KORF661",              0       },
 140         /* Lasat */
 141         /* LASAT Internet 33600 PnP */
 142         {       "LAS4040",              0       },
 143         /* Lasat Safire 560 PnP */
 144         {       "LAS4540",              0       },
 145         /* Lasat Safire 336  PnP */
 146         {       "LAS5440",              0       },
 147         /* Microcom, Inc. */
 148         /* Microcom TravelPorte FAST V.34 Plug & Play */
 149         {       "MNP0281",              0       },
 150         /* Microcom DeskPorte V.34 FAST or FAST+ Plug & Play */
 151         {       "MNP0336",              0       },
 152         /* Microcom DeskPorte FAST EP 28.8 Plug & Play */
 153         {       "MNP0339",              0       },
 154         /* Microcom DeskPorte 28.8P Plug & Play */
 155         {       "MNP0342",              0       },
 156         /* Microcom DeskPorte FAST ES 28.8 Plug & Play */
 157         {       "MNP0500",              0       },
 158         /* Microcom DeskPorte FAST ES 28.8 Plug & Play */
 159         {       "MNP0501",              0       },
 160         /* Microcom DeskPorte 28.8S Internal Plug & Play */
 161         {       "MNP0502",              0       },
 162         /* Motorola */
 163         /* Motorola BitSURFR Plug & Play */
 164         {       "MOT1105",              0       },
 165         /* Motorola TA210 Plug & Play */
 166         {       "MOT1111",              0       },
 167         /* Motorola HMTA 200 (ISDN) Plug & Play */
 168         {       "MOT1114",              0       },
 169         /* Motorola BitSURFR Plug & Play */
 170         {       "MOT1115",              0       },
 171         /* Motorola Lifestyle 28.8 Internal */
 172         {       "MOT1190",              0       },
 173         /* Motorola V.3400 Plug & Play */
 174         {       "MOT1501",              0       },
 175         /* Motorola Lifestyle 28.8 V.34 Plug & Play */
 176         {       "MOT1502",              0       },
 177         /* Motorola Power 28.8 V.34 Plug & Play */
 178         {       "MOT1505",              0       },
 179         /* Motorola ModemSURFR External 28.8 Plug & Play */
 180         {       "MOT1509",              0       },
 181         /* Motorola Premier 33.6 Desktop Plug & Play */
 182         {       "MOT150A",              0       },
 183         /* Motorola VoiceSURFR 56K External PnP */
 184         {       "MOT150F",              0       },
 185         /* Motorola ModemSURFR 56K External PnP */
 186         {       "MOT1510",              0       },
 187         /* Motorola ModemSURFR 56K Internal PnP */
 188         {       "MOT1550",              0       },
 189         /* Motorola ModemSURFR Internal 28.8 Plug & Play */
 190         {       "MOT1560",              0       },
 191         /* Motorola Premier 33.6 Internal Plug & Play */
 192         {       "MOT1580",              0       },
 193         /* Motorola OnlineSURFR 28.8 Internal Plug & Play */
 194         {       "MOT15B0",              0       },
 195         /* Motorola VoiceSURFR 56K Internal PnP */
 196         {       "MOT15F0",              0       },
 197         /* Com 1 */
 198         /*  Deskline K56 Phone System PnP */
 199         {       "MVX00A1",              0       },
 200         /* PC Rider K56 Phone System PnP */
 201         {       "MVX00F2",              0       },
 202         /* NEC 98NOTE SPEAKER PHONE FAX MODEM(33600bps) */
 203         {       "nEC8241",              0       },
 204         /* Pace 56 Voice Internal Plug & Play Modem */
 205         {       "PMC2430",              0       },
 206         /* Generic */
 207         /* Generic standard PC COM port  */
 208         {       "PNP0500",              0       },
 209         /* Generic 16550A-compatible COM port */
 210         {       "PNP0501",              0       },
 211         /* Compaq 14400 Modem */
 212         {       "PNPC000",              0       },
 213         /* Compaq 2400/9600 Modem */
 214         {       "PNPC001",              0       },
 215         /* Dial-Up Networking Serial Cable between 2 PCs */
 216         {       "PNPC031",              0       },
 217         /* Dial-Up Networking Parallel Cable between 2 PCs */
 218         {       "PNPC032",              0       },
 219         /* Standard 9600 bps Modem */
 220         {       "PNPC100",              0       },
 221         /* Standard 14400 bps Modem */
 222         {       "PNPC101",              0       },
 223         /*  Standard 28800 bps Modem*/
 224         {       "PNPC102",              0       },
 225         /*  Standard Modem*/
 226         {       "PNPC103",              0       },
 227         /*  Standard 9600 bps Modem*/
 228         {       "PNPC104",              0       },
 229         /*  Standard 14400 bps Modem*/
 230         {       "PNPC105",              0       },
 231         /*  Standard 28800 bps Modem*/
 232         {       "PNPC106",              0       },
 233         /*  Standard Modem */
 234         {       "PNPC107",              0       },
 235         /* Standard 9600 bps Modem */
 236         {       "PNPC108",              0       },
 237         /* Standard 14400 bps Modem */
 238         {       "PNPC109",              0       },
 239         /* Standard 28800 bps Modem */
 240         {       "PNPC10A",              0       },
 241         /* Standard Modem */
 242         {       "PNPC10B",              0       },
 243         /* Standard 9600 bps Modem */
 244         {       "PNPC10C",              0       },
 245         /* Standard 14400 bps Modem */
 246         {       "PNPC10D",              0       },
 247         /* Standard 28800 bps Modem */
 248         {       "PNPC10E",              0       },
 249         /* Standard Modem */
 250         {       "PNPC10F",              0       },
 251         /* Standard PCMCIA Card Modem */
 252         {       "PNP2000",              0       },
 253         /* Rockwell */
 254         /* Modular Technology */
 255         /* Rockwell 33.6 DPF Internal PnP */
 256         /* Modular Technology 33.6 Internal PnP */
 257         {       "ROK0030",              0       },
 258         /* Kortex International */
 259         /* KORTEX 14400 Externe PnP */
 260         {       "ROK0100",              0       },
 261         /* Rockwell 28.8 */
 262         {       "ROK4120",              0       },
 263         /* Viking Components, Inc */
 264         /* Viking 28.8 INTERNAL Fax+Data+Voice PnP */
 265         {       "ROK4920",              0       },
 266         /* Rockwell */
 267         /* British Telecom */
 268         /* Modular Technology */
 269         /* Rockwell 33.6 DPF External PnP */
 270         /* BT Prologue 33.6 External PnP */
 271         /* Modular Technology 33.6 External PnP */
 272         {       "RSS00A0",              0       },
 273         /* Viking 56K FAX INT */
 274         {       "RSS0262",              0       },
 275         /* K56 par,VV,Voice,Speakphone,AudioSpan,PnP */
 276         {       "RSS0250",              0       },
 277         /* SupraExpress 28.8 Data/Fax PnP modem */
 278         {       "SUP1310",              0       },
 279         /* SupraExpress 336i PnP Voice Modem */
 280         {       "SUP1381",              0       },
 281         /* SupraExpress 33.6 Data/Fax PnP modem */
 282         {       "SUP1421",              0       },
 283         /* SupraExpress 33.6 Data/Fax PnP modem */
 284         {       "SUP1590",              0       },
 285         /* SupraExpress 336i Sp ASVD */
 286         {       "SUP1620",              0       },
 287         /* SupraExpress 33.6 Data/Fax PnP modem */
 288         {       "SUP1760",              0       },
 289         /* SupraExpress 56i Sp Intl */
 290         {       "SUP2171",              0       },
 291         /* Phoebe Micro */
 292         /* Phoebe Micro 33.6 Data Fax 1433VQH Plug & Play */
 293         {       "TEX0011",              0       },
 294         /* Archtek America Corp. */
 295         /* Archtek SmartLink Modem 3334BT Plug & Play */
 296         {       "UAC000F",              0       },
 297         /* 3Com Corp. */
 298         /* Gateway Telepath IIvi 33.6 */
 299         {       "USR0000",              0       },
 300         /* U.S. Robotics Sporster 33.6K Fax INT PnP */
 301         {       "USR0002",              0       },
 302         /*  Sportster Vi 14.4 PnP FAX Voicemail */
 303         {       "USR0004",              0       },
 304         /* U.S. Robotics 33.6K Voice INT PnP */
 305         {       "USR0006",              0       },
 306         /* U.S. Robotics 33.6K Voice EXT PnP */
 307         {       "USR0007",              0       },
 308         /* U.S. Robotics Courier V.Everything INT PnP */
 309         {       "USR0009",              0       },
 310         /* U.S. Robotics 33.6K Voice INT PnP */
 311         {       "USR2002",              0       },
 312         /* U.S. Robotics 56K Voice INT PnP */
 313         {       "USR2070",              0       },
 314         /* U.S. Robotics 56K Voice EXT PnP */
 315         {       "USR2080",              0       },
 316         /* U.S. Robotics 56K FAX INT */
 317         {       "USR3031",              0       },
 318         /* U.S. Robotics 56K FAX INT */
 319         {       "USR3050",              0       },
 320         /* U.S. Robotics 56K Voice INT PnP */
 321         {       "USR3070",              0       },
 322         /* U.S. Robotics 56K Voice EXT PnP */
 323         {       "USR3080",              0       },
 324         /* U.S. Robotics 56K Voice INT PnP */
 325         {       "USR3090",              0       },
 326         /* U.S. Robotics 56K Message  */
 327         {       "USR9100",              0       },
 328         /* U.S. Robotics 56K FAX EXT PnP*/
 329         {       "USR9160",              0       },
 330         /* U.S. Robotics 56K FAX INT PnP*/
 331         {       "USR9170",              0       },
 332         /* U.S. Robotics 56K Voice EXT PnP*/
 333         {       "USR9180",              0       },
 334         /* U.S. Robotics 56K Voice INT PnP*/
 335         {       "USR9190",              0       },
 336         /* Wacom tablets */
 337         {       "WACFXXX",              0       },
 338         /* Compaq touchscreen */
 339         {       "FPI2002",              0 },
 340         /* Fujitsu Stylistic touchscreens */
 341         {       "FUJ02B2",              0 },
 342         {       "FUJ02B3",              0 },
 343         /* Fujitsu Stylistic LT touchscreens */
 344         {       "FUJ02B4",              0 },
 345         /* Passive Fujitsu Stylistic touchscreens */
 346         {       "FUJ02B6",              0 },
 347         {       "FUJ02B7",              0 },
 348         {       "FUJ02B8",              0 },
 349         {       "FUJ02B9",              0 },
 350         {       "FUJ02BC",              0 },
 351         /* Fujitsu Wacom Tablet PC device */
 352         {       "FUJ02E5",              0       },
 353         /* Fujitsu P-series tablet PC device */
 354         {       "FUJ02E6",              0       },
 355         /* Fujitsu Wacom 2FGT Tablet PC device */
 356         {       "FUJ02E7",              0       },
 357         /* Fujitsu Wacom 1FGT Tablet PC device */
 358         {       "FUJ02E9",              0       },
 359         /*
 360          * LG C1 EXPRESS DUAL (C1-PB11A3) touch screen (actually a FUJ02E6
 361          * in disguise).
 362          */
 363         {       "LTS0001",              0       },
 364         /* Rockwell's (PORALiNK) 33600 INT PNP */
 365         {       "WCI0003",              0       },
 366         /* Unknown PnP modems */
 367         {       "PNPCXXX",              UNKNOWN_DEV     },
 368         /* More unknown PnP modems */
 369         {       "PNPDXXX",              UNKNOWN_DEV     },
 370         /*
 371          * Winbond CIR port, should not be probed. We should keep track of
 372          * it to prevent the legacy serial driver from probing it.
 373          */
 374         {       "WEC1022",              CIR_PORT        },
 375         /*
 376          * SMSC IrCC SIR/FIR port, should not be probed by serial driver as
 377          * well so its own driver can bind to it.
 378          */
 379         {       "SMCF010",              CIR_PORT        },
 380         {       "",                     0       }
 381 };
 382
 383 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
 384
 385 static const char *modem_names[] = {
 386         "MODEM", "Modem", "modem", "FAX", "Fax", "fax",
 387         "56K", "56k", "K56", "33.6", "28.8", "14.4",
 388         "33,600", "28,800", "14,400", "33.600", "28.800", "14.400",
 389         "33600", "28800", "14400", "V.90", "V.34", "V.32", NULL
 390 };
 391
 392 static bool check_name(const char *name)
 393 {
 394         const char **tmp;
 395
 396         for (tmp = modem_names; *tmp; tmp++)
 397                 if (strstr(name, *tmp))
 398                         return true;
 399
 400         return false;
 401 }
 402
 403 static bool check_resources(struct pnp_dev *dev)
 404 {
 405         static const resource_size_t base[] = {0x2f8, 0x3f8, 0x2e8, 0x3e8};
 406         unsigned int i;
 407
 408         for (i = 0; i < ARRAY_SIZE(base); i++) {
 409                 if (pnp_possible_config(dev, IORESOURCE_IO, base[i], 8))
 410                         return true;
 411         }
 412
 413         return false;
 414 }
 415
 416 /*
 417  * Given a complete unknown PnP device, try to use some heuristics to
 418  * detect modems. Currently use such heuristic set:
 419  *     - dev->name or dev->bus->name must contain "modem" substring;
 420  *     - device must have only one IO region (8 byte long) with base address
 421  *       0x2e8, 0x3e8, 0x2f8 or 0x3f8.
 422  *
 423  * Such detection looks very ugly, but can detect at least some of numerous
 424  * PnP modems, alternatively we must hardcode all modems in pnp_devices[]
 425  * table.
 426  */
 427 static int serial_pnp_guess_board(struct pnp_dev *dev)
 428 {
 429         if (!(check_name(pnp_dev_name(dev)) ||
 430             (dev->card && check_name(dev->card->name))))
 431                 return -ENODEV;
 432
 433         if (check_resources(dev))
 434                 return 0;
 435
 436         return -ENODEV;
 437 }
 438
 439 static int
 440 serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 441 {
 442         struct uart_8250_port uart, *port;
 443         int ret, line, flags = dev_id->driver_data;
 444
 445         if (flags & UNKNOWN_DEV) {
 446                 ret = serial_pnp_guess_board(dev);
 447                 if (ret < 0)
 448                         return ret;
 449         }
 450
 451         memset(&uart, 0, sizeof(uart));
 452         if (pnp_irq_valid(dev, 0))
 453                 uart.port.irq = pnp_irq(dev, 0);
 454         if ((flags & CIR_PORT) && pnp_port_valid(dev, 2)) {
 455                 uart.port.iobase = pnp_port_start(dev, 2);
 456                 uart.port.iotype = UPIO_PORT;
 457         } else if (pnp_port_valid(dev, 0)) {
 458                 uart.port.iobase = pnp_port_start(dev, 0);
 459                 uart.port.iotype = UPIO_PORT;
 460         } else if (pnp_mem_valid(dev, 0)) {
 461                 uart.port.mapbase = pnp_mem_start(dev, 0);
 462                 uart.port.iotype = UPIO_MEM;
 463                 uart.port.flags = UPF_IOREMAP;
 464         } else
 465                 return -ENODEV;
 466
 467         dev_dbg(&dev->dev,
 468                  "Setup PNP port: port %lx, mem %pa, irq %d, type %d\n",
 469                  uart.port.iobase, &uart.port.mapbase,
 470                  uart.port.irq, uart.port.iotype);
 471
 472         if (flags & CIR_PORT) {
 473                 uart.port.flags |= UPF_FIXED_PORT | UPF_FIXED_TYPE;
 474                 uart.port.type = PORT_8250_CIR;
 475         }
 476
 477         uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
 478         if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
 479                 uart.port.flags |= UPF_SHARE_IRQ;
 480         uart.port.uartclk = 1843200;
 481         uart.port.dev = &dev->dev;
 482
 483         line = serial8250_register_8250_port(&uart);
 484         if (line < 0 || (flags & CIR_PORT))
 485                 return -ENODEV;
 486
 487         port = serial8250_get_port(line);
 488         if (uart_console(&port->port))
 489                 dev->capabilities |= PNP_CONSOLE;
 490
 491         pnp_set_drvdata(dev, (void *)((long)line + 1));
 492         return 0;
 493 }
 494
 495 static void serial_pnp_remove(struct pnp_dev *dev)
 496 {
 497         long line = (long)pnp_get_drvdata(dev);
 498
 499         dev->capabilities &= ~PNP_CONSOLE;
 500         if (line)
 501                 serial8250_unregister_port(line - 1);
 502 }
 503
 504 #ifdef CONFIG_PM
 505 static int serial_pnp_suspend(struct pnp_dev *dev, pm_message_t state)
 506 {
 507         long line = (long)pnp_get_drvdata(dev);
 508
 509         if (!line)
 510                 return -ENODEV;
 511         serial8250_suspend_port(line - 1);
 512         return 0;
 513 }
 514
 515 static int serial_pnp_resume(struct pnp_dev *dev)
 516 {
 517         long line = (long)pnp_get_drvdata(dev);
 518
 519         if (!line)
 520                 return -ENODEV;
 521         serial8250_resume_port(line - 1);
 522         return 0;
 523 }
 524 #else
 525 #define serial_pnp_suspend NULL
 526 #define serial_pnp_resume NULL
 527 #endif /* CONFIG_PM */
 528
 529 static struct pnp_driver serial_pnp_driver = {
 530         .name           = "serial",
 531         .probe          = serial_pnp_probe,
 532         .remove         = serial_pnp_remove,
 533         .suspend        = serial_pnp_suspend,
 534         .resume         = serial_pnp_resume,
 535         .id_table       = pnp_dev_table,
 536 };
 537
 538 int serial8250_pnp_init(void)
 539 {
 540         return pnp_register_driver(&serial_pnp_driver);
 541 }
 542
 543 void serial8250_pnp_exit(void)
 544 {
 545         pnp_unregister_driver(&serial_pnp_driver);
 546 }
 547