1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  Probe for 8250/16550-type ISAPNP serial ports.
4  *
5  *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
6  *
7  *  Copyright (C) 2001 Russell King, All Rights Reserved.
8  *
9  *  Ported to the Linux PnP Layer - (C) Adam Belay.
10  */
11 #include <linux/module.h>
12 #include <linux/pci.h>
13 #include <linux/pnp.h>
14 #include <linux/string.h>
15 #include <linux/kernel.h>
16 #include <linux/property.h>
17 #include <linux/serial_core.h>
18 #include <linux/bitops.h>
19 
20 #include <asm/byteorder.h>
21 
22 #include "8250.h"
23 
24 #define UNKNOWN_DEV 0x3000
25 #define CIR_PORT	0x0800
26 
27 static const struct pnp_device_id pnp_dev_table[] = {
28 	/* Archtek America Corp. */
29 	/* Archtek SmartLink Modem 3334BT Plug & Play */
30 	{	"AAC000F",		0	},
31 	/* Anchor Datacomm BV */
32 	/* SXPro 144 External Data Fax Modem Plug & Play */
33 	{	"ADC0001",		0	},
34 	/* SXPro 288 External Data Fax Modem Plug & Play */
35 	{	"ADC0002",		0	},
36 	/* PROLiNK 1456VH ISA PnP K56flex Fax Modem */
37 	{	"AEI0250",		0	},
38 	/* Actiontec ISA PNP 56K X2 Fax Modem */
39 	{	"AEI1240",		0	},
40 	/* Rockwell 56K ACF II Fax+Data+Voice Modem */
41 	{	"AKY1021",		0 /*SPCI_FL_NO_SHIRQ*/	},
42 	/*
43 	 * ALi Fast Infrared Controller
44 	 * Native driver (ali-ircc) is broken so at least
45 	 * it can be used with irtty-sir.
46 	 */
47 	{	"ALI5123",		0	},
48 	/* AZT3005 PnP SOUND DEVICE */
49 	{	"AZT4001",		0	},
50 	/* Best Data Products Inc. Smart One 336F PnP Modem */
51 	{	"BDP3336",		0	},
52 	/*  Boca Research */
53 	/* Boca Complete Ofc Communicator 14.4 Data-FAX */
54 	{	"BRI0A49",		0	},
55 	/* Boca Research 33,600 ACF Modem */
56 	{	"BRI1400",		0	},
57 	/* Boca 33.6 Kbps Internal FD34FSVD */
58 	{	"BRI3400",		0	},
59 	/* Computer Peripherals Inc */
60 	/* EuroViVa CommCenter-33.6 SP PnP */
61 	{	"CPI4050",		0	},
62 	/* Creative Labs */
63 	/* Creative Labs Phone Blaster 28.8 DSVD PnP Voice */
64 	{	"CTL3001",		0	},
65 	/* Creative Labs Modem Blaster 28.8 DSVD PnP Voice */
66 	{	"CTL3011",		0	},
67 	/* Davicom ISA 33.6K Modem */
68 	{	"DAV0336",		0	},
69 	/* Creative */
70 	/* Creative Modem Blaster Flash56 DI5601-1 */
71 	{	"DMB1032",		0	},
72 	/* Creative Modem Blaster V.90 DI5660 */
73 	{	"DMB2001",		0	},
74 	/* E-Tech */
75 	/* E-Tech CyberBULLET PC56RVP */
76 	{	"ETT0002",		0	},
77 	/* FUJITSU */
78 	/* Fujitsu 33600 PnP-I2 R Plug & Play */
79 	{	"FUJ0202",		0	},
80 	/* Fujitsu FMV-FX431 Plug & Play */
81 	{	"FUJ0205",		0	},
82 	/* Fujitsu 33600 PnP-I4 R Plug & Play */
83 	{	"FUJ0206",		0	},
84 	/* Fujitsu Fax Voice 33600 PNP-I5 R Plug & Play */
85 	{	"FUJ0209",		0	},
86 	/* Archtek America Corp. */
87 	/* Archtek SmartLink Modem 3334BT Plug & Play */
88 	{	"GVC000F",		0	},
89 	/* Archtek SmartLink Modem 3334BRV 33.6K Data Fax Voice */
90 	{	"GVC0303",		0	},
91 	/* Hayes */
92 	/* Hayes Optima 288 V.34-V.FC + FAX + Voice Plug & Play */
93 	{	"HAY0001",		0	},
94 	/* Hayes Optima 336 V.34 + FAX + Voice PnP */
95 	{	"HAY000C",		0	},
96 	/* Hayes Optima 336B V.34 + FAX + Voice PnP */
97 	{	"HAY000D",		0	},
98 	/* Hayes Accura 56K Ext Fax Modem PnP */
99 	{	"HAY5670",		0	},
100 	/* Hayes Accura 56K Ext Fax Modem PnP */
101 	{	"HAY5674",		0	},
102 	/* Hayes Accura 56K Fax Modem PnP */
103 	{	"HAY5675",		0	},
104 	/* Hayes 288, V.34 + FAX */
105 	{	"HAYF000",		0	},
106 	/* Hayes Optima 288 V.34 + FAX + Voice, Plug & Play */
107 	{	"HAYF001",		0	},
108 	/* IBM */
109 	/* IBM Thinkpad 701 Internal Modem Voice */
110 	{	"IBM0033",		0	},
111 	/* Intermec */
112 	/* Intermec CV60 touchscreen port */
113 	{	"PNP4972",		0	},
114 	/* Intertex */
115 	/* Intertex 28k8 33k6 Voice EXT PnP */
116 	{	"IXDC801",		0	},
117 	/* Intertex 33k6 56k Voice EXT PnP */
118 	{	"IXDC901",		0	},
119 	/* Intertex 28k8 33k6 Voice SP EXT PnP */
120 	{	"IXDD801",		0	},
121 	/* Intertex 33k6 56k Voice SP EXT PnP */
122 	{	"IXDD901",		0	},
123 	/* Intertex 28k8 33k6 Voice SP INT PnP */
124 	{	"IXDF401",		0	},
125 	/* Intertex 28k8 33k6 Voice SP EXT PnP */
126 	{	"IXDF801",		0	},
127 	/* Intertex 33k6 56k Voice SP EXT PnP */
128 	{	"IXDF901",		0	},
129 	/* Kortex International */
130 	/* KORTEX 28800 Externe PnP */
131 	{	"KOR4522",		0	},
132 	/* KXPro 33.6 Vocal ASVD PnP */
133 	{	"KORF661",		0	},
134 	/* Lasat */
135 	/* LASAT Internet 33600 PnP */
136 	{	"LAS4040",		0	},
137 	/* Lasat Safire 560 PnP */
138 	{	"LAS4540",		0	},
139 	/* Lasat Safire 336  PnP */
140 	{	"LAS5440",		0	},
141 	/* Microcom, Inc. */
142 	/* Microcom TravelPorte FAST V.34 Plug & Play */
143 	{	"MNP0281",		0	},
144 	/* Microcom DeskPorte V.34 FAST or FAST+ Plug & Play */
145 	{	"MNP0336",		0	},
146 	/* Microcom DeskPorte FAST EP 28.8 Plug & Play */
147 	{	"MNP0339",		0	},
148 	/* Microcom DeskPorte 28.8P Plug & Play */
149 	{	"MNP0342",		0	},
150 	/* Microcom DeskPorte FAST ES 28.8 Plug & Play */
151 	{	"MNP0500",		0	},
152 	/* Microcom DeskPorte FAST ES 28.8 Plug & Play */
153 	{	"MNP0501",		0	},
154 	/* Microcom DeskPorte 28.8S Internal Plug & Play */
155 	{	"MNP0502",		0	},
156 	/* Motorola */
157 	/* Motorola BitSURFR Plug & Play */
158 	{	"MOT1105",		0	},
159 	/* Motorola TA210 Plug & Play */
160 	{	"MOT1111",		0	},
161 	/* Motorola HMTA 200 (ISDN) Plug & Play */
162 	{	"MOT1114",		0	},
163 	/* Motorola BitSURFR Plug & Play */
164 	{	"MOT1115",		0	},
165 	/* Motorola Lifestyle 28.8 Internal */
166 	{	"MOT1190",		0	},
167 	/* Motorola V.3400 Plug & Play */
168 	{	"MOT1501",		0	},
169 	/* Motorola Lifestyle 28.8 V.34 Plug & Play */
170 	{	"MOT1502",		0	},
171 	/* Motorola Power 28.8 V.34 Plug & Play */
172 	{	"MOT1505",		0	},
173 	/* Motorola ModemSURFR External 28.8 Plug & Play */
174 	{	"MOT1509",		0	},
175 	/* Motorola Premier 33.6 Desktop Plug & Play */
176 	{	"MOT150A",		0	},
177 	/* Motorola VoiceSURFR 56K External PnP */
178 	{	"MOT150F",		0	},
179 	/* Motorola ModemSURFR 56K External PnP */
180 	{	"MOT1510",		0	},
181 	/* Motorola ModemSURFR 56K Internal PnP */
182 	{	"MOT1550",		0	},
183 	/* Motorola ModemSURFR Internal 28.8 Plug & Play */
184 	{	"MOT1560",		0	},
185 	/* Motorola Premier 33.6 Internal Plug & Play */
186 	{	"MOT1580",		0	},
187 	/* Motorola OnlineSURFR 28.8 Internal Plug & Play */
188 	{	"MOT15B0",		0	},
189 	/* Motorola VoiceSURFR 56K Internal PnP */
190 	{	"MOT15F0",		0	},
191 	/* Com 1 */
192 	/*  Deskline K56 Phone System PnP */
193 	{	"MVX00A1",		0	},
194 	/* PC Rider K56 Phone System PnP */
195 	{	"MVX00F2",		0	},
196 	/* NEC 98NOTE SPEAKER PHONE FAX MODEM(33600bps) */
197 	{	"nEC8241",		0	},
198 	/* Pace 56 Voice Internal Plug & Play Modem */
199 	{	"PMC2430",		0	},
200 	/* Generic */
201 	/* Generic standard PC COM port	 */
202 	{	"PNP0500",		0	},
203 	/* Generic 16550A-compatible COM port */
204 	{	"PNP0501",		0	},
205 	/* Compaq 14400 Modem */
206 	{	"PNPC000",		0	},
207 	/* Compaq 2400/9600 Modem */
208 	{	"PNPC001",		0	},
209 	/* Dial-Up Networking Serial Cable between 2 PCs */
210 	{	"PNPC031",		0	},
211 	/* Dial-Up Networking Parallel Cable between 2 PCs */
212 	{	"PNPC032",		0	},
213 	/* Standard 9600 bps Modem */
214 	{	"PNPC100",		0	},
215 	/* Standard 14400 bps Modem */
216 	{	"PNPC101",		0	},
217 	/*  Standard 28800 bps Modem*/
218 	{	"PNPC102",		0	},
219 	/*  Standard Modem*/
220 	{	"PNPC103",		0	},
221 	/*  Standard 9600 bps Modem*/
222 	{	"PNPC104",		0	},
223 	/*  Standard 14400 bps Modem*/
224 	{	"PNPC105",		0	},
225 	/*  Standard 28800 bps Modem*/
226 	{	"PNPC106",		0	},
227 	/*  Standard Modem */
228 	{	"PNPC107",		0	},
229 	/* Standard 9600 bps Modem */
230 	{	"PNPC108",		0	},
231 	/* Standard 14400 bps Modem */
232 	{	"PNPC109",		0	},
233 	/* Standard 28800 bps Modem */
234 	{	"PNPC10A",		0	},
235 	/* Standard Modem */
236 	{	"PNPC10B",		0	},
237 	/* Standard 9600 bps Modem */
238 	{	"PNPC10C",		0	},
239 	/* Standard 14400 bps Modem */
240 	{	"PNPC10D",		0	},
241 	/* Standard 28800 bps Modem */
242 	{	"PNPC10E",		0	},
243 	/* Standard Modem */
244 	{	"PNPC10F",		0	},
245 	/* Standard PCMCIA Card Modem */
246 	{	"PNP2000",		0	},
247 	/* Rockwell */
248 	/* Modular Technology */
249 	/* Rockwell 33.6 DPF Internal PnP */
250 	/* Modular Technology 33.6 Internal PnP */
251 	{	"ROK0030",		0	},
252 	/* Kortex International */
253 	/* KORTEX 14400 Externe PnP */
254 	{	"ROK0100",		0	},
255 	/* Rockwell 28.8 */
256 	{	"ROK4120",		0	},
257 	/* Viking Components, Inc */
258 	/* Viking 28.8 INTERNAL Fax+Data+Voice PnP */
259 	{	"ROK4920",		0	},
260 	/* Rockwell */
261 	/* British Telecom */
262 	/* Modular Technology */
263 	/* Rockwell 33.6 DPF External PnP */
264 	/* BT Prologue 33.6 External PnP */
265 	/* Modular Technology 33.6 External PnP */
266 	{	"RSS00A0",		0	},
267 	/* Viking 56K FAX INT */
268 	{	"RSS0262",		0	},
269 	/* K56 par,VV,Voice,Speakphone,AudioSpan,PnP */
270 	{       "RSS0250",              0       },
271 	/* SupraExpress 28.8 Data/Fax PnP modem */
272 	{	"SUP1310",		0	},
273 	/* SupraExpress 336i PnP Voice Modem */
274 	{	"SUP1381",		0	},
275 	/* SupraExpress 33.6 Data/Fax PnP modem */
276 	{	"SUP1421",		0	},
277 	/* SupraExpress 33.6 Data/Fax PnP modem */
278 	{	"SUP1590",		0	},
279 	/* SupraExpress 336i Sp ASVD */
280 	{	"SUP1620",		0	},
281 	/* SupraExpress 33.6 Data/Fax PnP modem */
282 	{	"SUP1760",		0	},
283 	/* SupraExpress 56i Sp Intl */
284 	{	"SUP2171",		0	},
285 	/* Phoebe Micro */
286 	/* Phoebe Micro 33.6 Data Fax 1433VQH Plug & Play */
287 	{	"TEX0011",		0	},
288 	/* Archtek America Corp. */
289 	/* Archtek SmartLink Modem 3334BT Plug & Play */
290 	{	"UAC000F",		0	},
291 	/* 3Com Corp. */
292 	/* Gateway Telepath IIvi 33.6 */
293 	{	"USR0000",		0	},
294 	/* U.S. Robotics Sporster 33.6K Fax INT PnP */
295 	{	"USR0002",		0	},
296 	/*  Sportster Vi 14.4 PnP FAX Voicemail */
297 	{	"USR0004",		0	},
298 	/* U.S. Robotics 33.6K Voice INT PnP */
299 	{	"USR0006",		0	},
300 	/* U.S. Robotics 33.6K Voice EXT PnP */
301 	{	"USR0007",		0	},
302 	/* U.S. Robotics Courier V.Everything INT PnP */
303 	{	"USR0009",		0	},
304 	/* U.S. Robotics 33.6K Voice INT PnP */
305 	{	"USR2002",		0	},
306 	/* U.S. Robotics 56K Voice INT PnP */
307 	{	"USR2070",		0	},
308 	/* U.S. Robotics 56K Voice EXT PnP */
309 	{	"USR2080",		0	},
310 	/* U.S. Robotics 56K FAX INT */
311 	{	"USR3031",		0	},
312 	/* U.S. Robotics 56K FAX INT */
313 	{	"USR3050",		0	},
314 	/* U.S. Robotics 56K Voice INT PnP */
315 	{	"USR3070",		0	},
316 	/* U.S. Robotics 56K Voice EXT PnP */
317 	{	"USR3080",		0	},
318 	/* U.S. Robotics 56K Voice INT PnP */
319 	{	"USR3090",		0	},
320 	/* U.S. Robotics 56K Message  */
321 	{	"USR9100",		0	},
322 	/* U.S. Robotics 56K FAX EXT PnP*/
323 	{	"USR9160",		0	},
324 	/* U.S. Robotics 56K FAX INT PnP*/
325 	{	"USR9170",		0	},
326 	/* U.S. Robotics 56K Voice EXT PnP*/
327 	{	"USR9180",		0	},
328 	/* U.S. Robotics 56K Voice INT PnP*/
329 	{	"USR9190",		0	},
330 	/* Wacom tablets */
331 	{	"WACFXXX",		0	},
332 	/* Compaq touchscreen */
333 	{       "FPI2002",              0 },
334 	/* Fujitsu Stylistic touchscreens */
335 	{       "FUJ02B2",              0 },
336 	{       "FUJ02B3",              0 },
337 	/* Fujitsu Stylistic LT touchscreens */
338 	{       "FUJ02B4",              0 },
339 	/* Passive Fujitsu Stylistic touchscreens */
340 	{       "FUJ02B6",              0 },
341 	{       "FUJ02B7",              0 },
342 	{       "FUJ02B8",              0 },
343 	{       "FUJ02B9",              0 },
344 	{       "FUJ02BC",              0 },
345 	/* Fujitsu Wacom Tablet PC device */
346 	{	"FUJ02E5",		0	},
347 	/* Fujitsu P-series tablet PC device */
348 	{	"FUJ02E6",		0	},
349 	/* Fujitsu Wacom 2FGT Tablet PC device */
350 	{	"FUJ02E7",		0	},
351 	/* Fujitsu Wacom 1FGT Tablet PC device */
352 	{	"FUJ02E9",		0	},
353 	/*
354 	 * LG C1 EXPRESS DUAL (C1-PB11A3) touch screen (actually a FUJ02E6
355 	 * in disguise).
356 	 */
357 	{	"LTS0001",		0       },
358 	/* Rockwell's (PORALiNK) 33600 INT PNP */
359 	{	"WCI0003",		0	},
360 	/* Unknown PnP modems */
361 	{	"PNPCXXX",		UNKNOWN_DEV	},
362 	/* More unknown PnP modems */
363 	{	"PNPDXXX",		UNKNOWN_DEV	},
364 	/*
365 	 * Winbond CIR port, should not be probed. We should keep track of
366 	 * it to prevent the legacy serial driver from probing it.
367 	 */
368 	{	"WEC1022",		CIR_PORT	},
369 	/*
370 	 * SMSC IrCC SIR/FIR port, should not be probed by serial driver as
371 	 * well so its own driver can bind to it.
372 	 */
373 	{	"SMCF010",		CIR_PORT	},
374 	{	"",			0	}
375 };
376 
377 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
378 
379 static const char *modem_names[] = {
380 	"MODEM", "Modem", "modem", "FAX", "Fax", "fax",
381 	"56K", "56k", "K56", "33.6", "28.8", "14.4",
382 	"33,600", "28,800", "14,400", "33.600", "28.800", "14.400",
383 	"33600", "28800", "14400", "V.90", "V.34", "V.32", NULL
384 };
385 
check_name(const char * name)386 static bool check_name(const char *name)
387 {
388 	const char **tmp;
389 
390 	for (tmp = modem_names; *tmp; tmp++)
391 		if (strstr(name, *tmp))
392 			return true;
393 
394 	return false;
395 }
396 
check_resources(struct pnp_dev * dev)397 static bool check_resources(struct pnp_dev *dev)
398 {
399 	static const resource_size_t base[] = {0x2f8, 0x3f8, 0x2e8, 0x3e8};
400 	unsigned int i;
401 
402 	for (i = 0; i < ARRAY_SIZE(base); i++) {
403 		if (pnp_possible_config(dev, IORESOURCE_IO, base[i], 8))
404 			return true;
405 	}
406 
407 	return false;
408 }
409 
410 /*
411  * Given a complete unknown PnP device, try to use some heuristics to
412  * detect modems. Currently use such heuristic set:
413  *     - dev->name or dev->bus->name must contain "modem" substring;
414  *     - device must have only one IO region (8 byte long) with base address
415  *       0x2e8, 0x3e8, 0x2f8 or 0x3f8.
416  *
417  * Such detection looks very ugly, but can detect at least some of numerous
418  * PnP modems, alternatively we must hardcode all modems in pnp_devices[]
419  * table.
420  */
serial_pnp_guess_board(struct pnp_dev * dev)421 static int serial_pnp_guess_board(struct pnp_dev *dev)
422 {
423 	if (!(check_name(pnp_dev_name(dev)) ||
424 	    (dev->card && check_name(dev->card->name))))
425 		return -ENODEV;
426 
427 	if (check_resources(dev))
428 		return 0;
429 
430 	return -ENODEV;
431 }
432 
433 static int
serial_pnp_probe(struct pnp_dev * dev,const struct pnp_device_id * dev_id)434 serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
435 {
436 	struct uart_8250_port uart, *port;
437 	int ret, line, flags = dev_id->driver_data;
438 
439 	if (flags & UNKNOWN_DEV) {
440 		ret = serial_pnp_guess_board(dev);
441 		if (ret < 0)
442 			return ret;
443 	}
444 
445 	memset(&uart, 0, sizeof(uart));
446 	if (pnp_irq_valid(dev, 0))
447 		uart.port.irq = pnp_irq(dev, 0);
448 	if ((flags & CIR_PORT) && pnp_port_valid(dev, 2)) {
449 		uart.port.iobase = pnp_port_start(dev, 2);
450 		uart.port.iotype = UPIO_PORT;
451 	} else if (pnp_port_valid(dev, 0)) {
452 		uart.port.iobase = pnp_port_start(dev, 0);
453 		uart.port.iotype = UPIO_PORT;
454 	} else if (pnp_mem_valid(dev, 0)) {
455 		uart.port.mapbase = pnp_mem_start(dev, 0);
456 		uart.port.iotype = UPIO_MEM;
457 		uart.port.flags = UPF_IOREMAP;
458 	} else
459 		return -ENODEV;
460 
461 	dev_dbg(&dev->dev,
462 		 "Setup PNP port: port %#lx, mem %#llx, irq %u, type %u\n",
463 		 uart.port.iobase, (unsigned long long)uart.port.mapbase,
464 		 uart.port.irq, uart.port.iotype);
465 
466 	if (flags & CIR_PORT) {
467 		uart.port.flags |= UPF_FIXED_PORT | UPF_FIXED_TYPE;
468 		uart.port.type = PORT_8250_CIR;
469 	}
470 
471 	uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
472 	if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
473 		uart.port.flags |= UPF_SHARE_IRQ;
474 	uart.port.uartclk = 1843200;
475 	device_property_read_u32(&dev->dev, "clock-frequency", &uart.port.uartclk);
476 	uart.port.dev = &dev->dev;
477 
478 	line = serial8250_register_8250_port(&uart);
479 	if (line < 0 || (flags & CIR_PORT))
480 		return -ENODEV;
481 
482 	port = serial8250_get_port(line);
483 	if (uart_console(&port->port))
484 		dev->capabilities |= PNP_CONSOLE;
485 
486 	pnp_set_drvdata(dev, (void *)((long)line + 1));
487 	return 0;
488 }
489 
serial_pnp_remove(struct pnp_dev * dev)490 static void serial_pnp_remove(struct pnp_dev *dev)
491 {
492 	long line = (long)pnp_get_drvdata(dev);
493 
494 	dev->capabilities &= ~PNP_CONSOLE;
495 	if (line)
496 		serial8250_unregister_port(line - 1);
497 }
498 
serial_pnp_suspend(struct device * dev)499 static int __maybe_unused serial_pnp_suspend(struct device *dev)
500 {
501 	long line = (long)dev_get_drvdata(dev);
502 
503 	if (!line)
504 		return -ENODEV;
505 	serial8250_suspend_port(line - 1);
506 	return 0;
507 }
508 
serial_pnp_resume(struct device * dev)509 static int __maybe_unused serial_pnp_resume(struct device *dev)
510 {
511 	long line = (long)dev_get_drvdata(dev);
512 
513 	if (!line)
514 		return -ENODEV;
515 	serial8250_resume_port(line - 1);
516 	return 0;
517 }
518 
519 static SIMPLE_DEV_PM_OPS(serial_pnp_pm_ops, serial_pnp_suspend, serial_pnp_resume);
520 
521 static struct pnp_driver serial_pnp_driver = {
522 	.name		= "serial",
523 	.probe		= serial_pnp_probe,
524 	.remove		= serial_pnp_remove,
525 	.driver         = {
526 		.pm     = &serial_pnp_pm_ops,
527 	},
528 	.id_table	= pnp_dev_table,
529 };
530 
serial8250_pnp_init(void)531 int serial8250_pnp_init(void)
532 {
533 	return pnp_register_driver(&serial_pnp_driver);
534 }
535 
serial8250_pnp_exit(void)536 void serial8250_pnp_exit(void)
537 {
538 	pnp_unregister_driver(&serial_pnp_driver);
539 }
540 
541