blob: 1636806ec55e8432af872e6327ef02b297db795c [file] [log] [blame]
Doug Warzecha90563ec2005-09-06 15:17:15 -07001/*
2 * dcdbas.c: Dell Systems Management Base Driver
3 *
4 * The Dell Systems Management Base Driver provides a sysfs interface for
5 * systems management software to perform System Management Interrupts (SMIs)
6 * and Host Control Actions (power cycle or power off after OS shutdown) on
7 * Dell systems.
8 *
9 * See Documentation/dcdbas.txt for more information.
10 *
Doug Warzechab95936c2006-10-19 23:29:09 -070011 * Copyright (C) 1995-2006 Dell Inc.
Doug Warzecha90563ec2005-09-06 15:17:15 -070012 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License v2.0 as published by
15 * the Free Software Foundation.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 */
22
Russell Kingd052d1b2005-10-29 19:07:23 +010023#include <linux/platform_device.h>
Doug Warzecha90563ec2005-09-06 15:17:15 -070024#include <linux/dma-mapping.h>
25#include <linux/errno.h>
26#include <linux/init.h>
27#include <linux/kernel.h>
28#include <linux/mc146818rtc.h>
29#include <linux/module.h>
30#include <linux/reboot.h>
31#include <linux/sched.h>
32#include <linux/smp.h>
33#include <linux/spinlock.h>
34#include <linux/string.h>
35#include <linux/types.h>
Arjan van de Ven8ed965d2006-03-23 03:00:21 -080036#include <linux/mutex.h>
Doug Warzecha90563ec2005-09-06 15:17:15 -070037#include <asm/io.h>
38#include <asm/semaphore.h>
39
40#include "dcdbas.h"
41
42#define DRIVER_NAME "dcdbas"
Doug Warzechab95936c2006-10-19 23:29:09 -070043#define DRIVER_VERSION "5.6.0-3.2"
Doug Warzecha90563ec2005-09-06 15:17:15 -070044#define DRIVER_DESCRIPTION "Dell Systems Management Base Driver"
45
46static struct platform_device *dcdbas_pdev;
47
48static u8 *smi_data_buf;
49static dma_addr_t smi_data_buf_handle;
50static unsigned long smi_data_buf_size;
51static u32 smi_data_buf_phys_addr;
Arjan van de Ven8ed965d2006-03-23 03:00:21 -080052static DEFINE_MUTEX(smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -070053
54static unsigned int host_control_action;
55static unsigned int host_control_smi_type;
56static unsigned int host_control_on_shutdown;
57
58/**
59 * smi_data_buf_free: free SMI data buffer
60 */
61static void smi_data_buf_free(void)
62{
63 if (!smi_data_buf)
64 return;
65
66 dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
67 __FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size);
68
69 dma_free_coherent(&dcdbas_pdev->dev, smi_data_buf_size, smi_data_buf,
70 smi_data_buf_handle);
71 smi_data_buf = NULL;
72 smi_data_buf_handle = 0;
73 smi_data_buf_phys_addr = 0;
74 smi_data_buf_size = 0;
75}
76
77/**
78 * smi_data_buf_realloc: grow SMI data buffer if needed
79 */
80static int smi_data_buf_realloc(unsigned long size)
81{
82 void *buf;
83 dma_addr_t handle;
84
85 if (smi_data_buf_size >= size)
86 return 0;
87
88 if (size > MAX_SMI_DATA_BUF_SIZE)
89 return -EINVAL;
90
91 /* new buffer is needed */
92 buf = dma_alloc_coherent(&dcdbas_pdev->dev, size, &handle, GFP_KERNEL);
93 if (!buf) {
94 dev_dbg(&dcdbas_pdev->dev,
95 "%s: failed to allocate memory size %lu\n",
96 __FUNCTION__, size);
97 return -ENOMEM;
98 }
99 /* memory zeroed by dma_alloc_coherent */
100
101 if (smi_data_buf)
102 memcpy(buf, smi_data_buf, smi_data_buf_size);
103
104 /* free any existing buffer */
105 smi_data_buf_free();
106
107 /* set up new buffer for use */
108 smi_data_buf = buf;
109 smi_data_buf_handle = handle;
110 smi_data_buf_phys_addr = (u32) virt_to_phys(buf);
111 smi_data_buf_size = size;
112
113 dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
114 __FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size);
115
116 return 0;
117}
118
119static ssize_t smi_data_buf_phys_addr_show(struct device *dev,
120 struct device_attribute *attr,
121 char *buf)
122{
123 return sprintf(buf, "%x\n", smi_data_buf_phys_addr);
124}
125
126static ssize_t smi_data_buf_size_show(struct device *dev,
127 struct device_attribute *attr,
128 char *buf)
129{
130 return sprintf(buf, "%lu\n", smi_data_buf_size);
131}
132
133static ssize_t smi_data_buf_size_store(struct device *dev,
134 struct device_attribute *attr,
135 const char *buf, size_t count)
136{
137 unsigned long buf_size;
138 ssize_t ret;
139
140 buf_size = simple_strtoul(buf, NULL, 10);
141
142 /* make sure SMI data buffer is at least buf_size */
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800143 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700144 ret = smi_data_buf_realloc(buf_size);
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800145 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700146 if (ret)
147 return ret;
148
149 return count;
150}
151
Zhang Rui91a69022007-06-09 13:57:22 +0800152static ssize_t smi_data_read(struct kobject *kobj,
153 struct bin_attribute *bin_attr,
154 char *buf, loff_t pos, size_t count)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700155{
156 size_t max_read;
157 ssize_t ret;
158
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800159 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700160
161 if (pos >= smi_data_buf_size) {
162 ret = 0;
163 goto out;
164 }
165
166 max_read = smi_data_buf_size - pos;
167 ret = min(max_read, count);
168 memcpy(buf, smi_data_buf + pos, ret);
169out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800170 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700171 return ret;
172}
173
Zhang Rui91a69022007-06-09 13:57:22 +0800174static ssize_t smi_data_write(struct kobject *kobj,
175 struct bin_attribute *bin_attr,
176 char *buf, loff_t pos, size_t count)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700177{
178 ssize_t ret;
179
Doug Warzechab95936c2006-10-19 23:29:09 -0700180 if ((pos + count) > MAX_SMI_DATA_BUF_SIZE)
181 return -EINVAL;
182
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800183 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700184
185 ret = smi_data_buf_realloc(pos + count);
186 if (ret)
187 goto out;
188
189 memcpy(smi_data_buf + pos, buf, count);
190 ret = count;
191out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800192 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700193 return ret;
194}
195
196static ssize_t host_control_action_show(struct device *dev,
197 struct device_attribute *attr,
198 char *buf)
199{
200 return sprintf(buf, "%u\n", host_control_action);
201}
202
203static ssize_t host_control_action_store(struct device *dev,
204 struct device_attribute *attr,
205 const char *buf, size_t count)
206{
207 ssize_t ret;
208
209 /* make sure buffer is available for host control command */
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800210 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700211 ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800212 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700213 if (ret)
214 return ret;
215
216 host_control_action = simple_strtoul(buf, NULL, 10);
217 return count;
218}
219
220static ssize_t host_control_smi_type_show(struct device *dev,
221 struct device_attribute *attr,
222 char *buf)
223{
224 return sprintf(buf, "%u\n", host_control_smi_type);
225}
226
227static ssize_t host_control_smi_type_store(struct device *dev,
228 struct device_attribute *attr,
229 const char *buf, size_t count)
230{
231 host_control_smi_type = simple_strtoul(buf, NULL, 10);
232 return count;
233}
234
235static ssize_t host_control_on_shutdown_show(struct device *dev,
236 struct device_attribute *attr,
237 char *buf)
238{
239 return sprintf(buf, "%u\n", host_control_on_shutdown);
240}
241
242static ssize_t host_control_on_shutdown_store(struct device *dev,
243 struct device_attribute *attr,
244 const char *buf, size_t count)
245{
246 host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
247 return count;
248}
249
250/**
251 * smi_request: generate SMI request
252 *
253 * Called with smi_data_lock.
254 */
255static int smi_request(struct smi_cmd *smi_cmd)
256{
257 cpumask_t old_mask;
258 int ret = 0;
259
260 if (smi_cmd->magic != SMI_CMD_MAGIC) {
261 dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
262 __FUNCTION__);
263 return -EBADR;
264 }
265
266 /* SMI requires CPU 0 */
267 old_mask = current->cpus_allowed;
268 set_cpus_allowed(current, cpumask_of_cpu(0));
269 if (smp_processor_id() != 0) {
270 dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
271 __FUNCTION__);
272 ret = -EBUSY;
273 goto out;
274 }
275
276 /* generate SMI */
277 asm volatile (
278 "outb %b0,%w1"
279 : /* no output args */
280 : "a" (smi_cmd->command_code),
281 "d" (smi_cmd->command_address),
282 "b" (smi_cmd->ebx),
283 "c" (smi_cmd->ecx)
284 : "memory"
285 );
286
287out:
288 set_cpus_allowed(current, old_mask);
289 return ret;
290}
291
292/**
293 * smi_request_store:
294 *
295 * The valid values are:
296 * 0: zero SMI data buffer
297 * 1: generate calling interface SMI
298 * 2: generate raw SMI
299 *
300 * User application writes smi_cmd to smi_data before telling driver
301 * to generate SMI.
302 */
303static ssize_t smi_request_store(struct device *dev,
304 struct device_attribute *attr,
305 const char *buf, size_t count)
306{
307 struct smi_cmd *smi_cmd;
308 unsigned long val = simple_strtoul(buf, NULL, 10);
309 ssize_t ret;
310
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800311 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700312
313 if (smi_data_buf_size < sizeof(struct smi_cmd)) {
314 ret = -ENODEV;
315 goto out;
316 }
317 smi_cmd = (struct smi_cmd *)smi_data_buf;
318
319 switch (val) {
320 case 2:
321 /* Raw SMI */
322 ret = smi_request(smi_cmd);
323 if (!ret)
324 ret = count;
325 break;
326 case 1:
327 /* Calling Interface SMI */
328 smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer);
329 ret = smi_request(smi_cmd);
330 if (!ret)
331 ret = count;
332 break;
333 case 0:
334 memset(smi_data_buf, 0, smi_data_buf_size);
335 ret = count;
336 break;
337 default:
338 ret = -EINVAL;
339 break;
340 }
341
342out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800343 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700344 return ret;
345}
346
347/**
348 * host_control_smi: generate host control SMI
349 *
350 * Caller must set up the host control command in smi_data_buf.
351 */
352static int host_control_smi(void)
353{
354 struct apm_cmd *apm_cmd;
355 u8 *data;
356 unsigned long flags;
357 u32 num_ticks;
358 s8 cmd_status;
359 u8 index;
360
361 apm_cmd = (struct apm_cmd *)smi_data_buf;
362 apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
363
364 switch (host_control_smi_type) {
365 case HC_SMITYPE_TYPE1:
366 spin_lock_irqsave(&rtc_lock, flags);
367 /* write SMI data buffer physical address */
368 data = (u8 *)&smi_data_buf_phys_addr;
369 for (index = PE1300_CMOS_CMD_STRUCT_PTR;
370 index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
371 index++, data++) {
372 outb(index,
373 (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
374 outb(*data,
375 (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
376 }
377
378 /* first set status to -1 as called by spec */
379 cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
380 outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
381
382 /* generate SMM call */
383 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
384 spin_unlock_irqrestore(&rtc_lock, flags);
385
386 /* wait a few to see if it executed */
387 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
388 while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
389 == ESM_STATUS_CMD_UNSUCCESSFUL) {
390 num_ticks--;
391 if (num_ticks == EXPIRED_TIMER)
392 return -ETIME;
393 }
394 break;
395
396 case HC_SMITYPE_TYPE2:
397 case HC_SMITYPE_TYPE3:
398 spin_lock_irqsave(&rtc_lock, flags);
399 /* write SMI data buffer physical address */
400 data = (u8 *)&smi_data_buf_phys_addr;
401 for (index = PE1400_CMOS_CMD_STRUCT_PTR;
402 index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
403 index++, data++) {
404 outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
405 outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
406 }
407
408 /* generate SMM call */
409 if (host_control_smi_type == HC_SMITYPE_TYPE3)
410 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
411 else
412 outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
413
414 /* restore RTC index pointer since it was written to above */
415 CMOS_READ(RTC_REG_C);
416 spin_unlock_irqrestore(&rtc_lock, flags);
417
418 /* read control port back to serialize write */
419 cmd_status = inb(PE1400_APM_CONTROL_PORT);
420
421 /* wait a few to see if it executed */
422 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
423 while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
424 num_ticks--;
425 if (num_ticks == EXPIRED_TIMER)
426 return -ETIME;
427 }
428 break;
429
430 default:
431 dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
432 __FUNCTION__, host_control_smi_type);
433 return -ENOSYS;
434 }
435
436 return 0;
437}
438
439/**
440 * dcdbas_host_control: initiate host control
441 *
442 * This function is called by the driver after the system has
443 * finished shutting down if the user application specified a
444 * host control action to perform on shutdown. It is safe to
445 * use smi_data_buf at this point because the system has finished
446 * shutting down and no userspace apps are running.
447 */
448static void dcdbas_host_control(void)
449{
450 struct apm_cmd *apm_cmd;
451 u8 action;
452
453 if (host_control_action == HC_ACTION_NONE)
454 return;
455
456 action = host_control_action;
457 host_control_action = HC_ACTION_NONE;
458
459 if (!smi_data_buf) {
460 dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __FUNCTION__);
461 return;
462 }
463
464 if (smi_data_buf_size < sizeof(struct apm_cmd)) {
465 dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
466 __FUNCTION__);
467 return;
468 }
469
470 apm_cmd = (struct apm_cmd *)smi_data_buf;
471
472 /* power off takes precedence */
473 if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
474 apm_cmd->command = ESM_APM_POWER_CYCLE;
475 apm_cmd->reserved = 0;
476 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
477 host_control_smi();
478 } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
479 apm_cmd->command = ESM_APM_POWER_CYCLE;
480 apm_cmd->reserved = 0;
481 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
482 host_control_smi();
483 }
484}
485
486/**
487 * dcdbas_reboot_notify: handle reboot notification for host control
488 */
489static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
490 void *unused)
491{
Doug Warzecha90563ec2005-09-06 15:17:15 -0700492 switch (code) {
493 case SYS_DOWN:
494 case SYS_HALT:
495 case SYS_POWER_OFF:
496 if (host_control_on_shutdown) {
497 /* firmware is going to perform host control action */
Alan Sterne041c682006-03-27 01:16:30 -0800498 printk(KERN_WARNING "Please wait for shutdown "
499 "action to complete...\n");
500 dcdbas_host_control();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700501 }
502 break;
503 }
504
505 return NOTIFY_DONE;
506}
507
508static struct notifier_block dcdbas_reboot_nb = {
509 .notifier_call = dcdbas_reboot_notify,
510 .next = NULL,
Alan Sterne041c682006-03-27 01:16:30 -0800511 .priority = INT_MIN
Doug Warzecha90563ec2005-09-06 15:17:15 -0700512};
513
514static DCDBAS_BIN_ATTR_RW(smi_data);
515
516static struct bin_attribute *dcdbas_bin_attrs[] = {
517 &bin_attr_smi_data,
518 NULL
519};
520
521static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
522static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
523static DCDBAS_DEV_ATTR_WO(smi_request);
524static DCDBAS_DEV_ATTR_RW(host_control_action);
525static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
526static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
527
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800528static struct attribute *dcdbas_dev_attrs[] = {
529 &dev_attr_smi_data_buf_size.attr,
530 &dev_attr_smi_data_buf_phys_addr.attr,
531 &dev_attr_smi_request.attr,
532 &dev_attr_host_control_action.attr,
533 &dev_attr_host_control_smi_type.attr,
534 &dev_attr_host_control_on_shutdown.attr,
Doug Warzecha90563ec2005-09-06 15:17:15 -0700535 NULL
536};
537
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800538static struct attribute_group dcdbas_attr_group = {
539 .attrs = dcdbas_dev_attrs,
540};
541
542static int __devinit dcdbas_probe(struct platform_device *dev)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700543{
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800544 int i, error;
Doug Warzecha90563ec2005-09-06 15:17:15 -0700545
546 host_control_action = HC_ACTION_NONE;
547 host_control_smi_type = HC_SMITYPE_NONE;
548
Doug Warzecha90563ec2005-09-06 15:17:15 -0700549 /*
550 * BIOS SMI calls require buffer addresses be in 32-bit address space.
551 * This is done by setting the DMA mask below.
552 */
553 dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
554 dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask;
555
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800556 error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
557 if (error)
558 return error;
559
560 for (i = 0; dcdbas_bin_attrs[i]; i++) {
561 error = sysfs_create_bin_file(&dev->dev.kobj,
562 dcdbas_bin_attrs[i]);
563 if (error) {
564 while (--i >= 0)
565 sysfs_remove_bin_file(&dev->dev.kobj,
566 dcdbas_bin_attrs[i]);
Jeff Garzik0968cf512006-10-10 02:58:14 -0400567 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800568 return error;
569 }
570 }
571
Doug Warzecha90563ec2005-09-06 15:17:15 -0700572 register_reboot_notifier(&dcdbas_reboot_nb);
573
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800574 dev_info(&dev->dev, "%s (version %s)\n",
Doug Warzecha90563ec2005-09-06 15:17:15 -0700575 DRIVER_DESCRIPTION, DRIVER_VERSION);
576
577 return 0;
578}
579
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800580static int __devexit dcdbas_remove(struct platform_device *dev)
581{
582 int i;
583
584 unregister_reboot_notifier(&dcdbas_reboot_nb);
585 for (i = 0; dcdbas_bin_attrs[i]; i++)
586 sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]);
587 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
588
589 return 0;
590}
591
592static struct platform_driver dcdbas_driver = {
593 .driver = {
594 .name = DRIVER_NAME,
595 .owner = THIS_MODULE,
596 },
597 .probe = dcdbas_probe,
598 .remove = __devexit_p(dcdbas_remove),
599};
600
601/**
602 * dcdbas_init: initialize driver
603 */
604static int __init dcdbas_init(void)
605{
606 int error;
607
608 error = platform_driver_register(&dcdbas_driver);
609 if (error)
610 return error;
611
612 dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1);
613 if (!dcdbas_pdev) {
614 error = -ENOMEM;
615 goto err_unregister_driver;
616 }
617
618 error = platform_device_add(dcdbas_pdev);
619 if (error)
620 goto err_free_device;
621
622 return 0;
623
624 err_free_device:
625 platform_device_put(dcdbas_pdev);
626 err_unregister_driver:
627 platform_driver_unregister(&dcdbas_driver);
628 return error;
629}
630
Doug Warzecha90563ec2005-09-06 15:17:15 -0700631/**
632 * dcdbas_exit: perform driver cleanup
633 */
634static void __exit dcdbas_exit(void)
635{
Doug Warzecha435a80f2006-03-09 17:33:35 -0800636 /*
637 * make sure functions that use dcdbas_pdev are called
638 * before platform_device_unregister
639 */
Doug Warzecha90563ec2005-09-06 15:17:15 -0700640 unregister_reboot_notifier(&dcdbas_reboot_nb);
641 smi_data_buf_free();
Doug Warzecha435a80f2006-03-09 17:33:35 -0800642 platform_device_unregister(dcdbas_pdev);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800643 platform_driver_unregister(&dcdbas_driver);
644
645 /*
646 * We have to free the buffer here instead of dcdbas_remove
647 * because only in module exit function we can be sure that
648 * all sysfs attributes belonging to this module have been
649 * released.
650 */
651 smi_data_buf_free();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700652}
653
654module_init(dcdbas_init);
655module_exit(dcdbas_exit);
656
657MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
658MODULE_VERSION(DRIVER_VERSION);
659MODULE_AUTHOR("Dell Inc.");
660MODULE_LICENSE("GPL");
Matt Domsch8f47f0b2008-02-06 01:36:24 -0800661/* Any System or BIOS claiming to be by Dell */
662MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*");