blob: 1865b56fb141643878b50b4874c4be56f612ff0c [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
152static ssize_t smi_data_read(struct kobject *kobj, char *buf, loff_t pos,
153 size_t count)
154{
155 size_t max_read;
156 ssize_t ret;
157
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800158 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700159
160 if (pos >= smi_data_buf_size) {
161 ret = 0;
162 goto out;
163 }
164
165 max_read = smi_data_buf_size - pos;
166 ret = min(max_read, count);
167 memcpy(buf, smi_data_buf + pos, ret);
168out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800169 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700170 return ret;
171}
172
173static ssize_t smi_data_write(struct kobject *kobj, char *buf, loff_t pos,
174 size_t count)
175{
176 ssize_t ret;
177
Doug Warzechab95936c2006-10-19 23:29:09 -0700178 if ((pos + count) > MAX_SMI_DATA_BUF_SIZE)
179 return -EINVAL;
180
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800181 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700182
183 ret = smi_data_buf_realloc(pos + count);
184 if (ret)
185 goto out;
186
187 memcpy(smi_data_buf + pos, buf, count);
188 ret = count;
189out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800190 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700191 return ret;
192}
193
194static ssize_t host_control_action_show(struct device *dev,
195 struct device_attribute *attr,
196 char *buf)
197{
198 return sprintf(buf, "%u\n", host_control_action);
199}
200
201static ssize_t host_control_action_store(struct device *dev,
202 struct device_attribute *attr,
203 const char *buf, size_t count)
204{
205 ssize_t ret;
206
207 /* make sure buffer is available for host control command */
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800208 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700209 ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800210 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700211 if (ret)
212 return ret;
213
214 host_control_action = simple_strtoul(buf, NULL, 10);
215 return count;
216}
217
218static ssize_t host_control_smi_type_show(struct device *dev,
219 struct device_attribute *attr,
220 char *buf)
221{
222 return sprintf(buf, "%u\n", host_control_smi_type);
223}
224
225static ssize_t host_control_smi_type_store(struct device *dev,
226 struct device_attribute *attr,
227 const char *buf, size_t count)
228{
229 host_control_smi_type = simple_strtoul(buf, NULL, 10);
230 return count;
231}
232
233static ssize_t host_control_on_shutdown_show(struct device *dev,
234 struct device_attribute *attr,
235 char *buf)
236{
237 return sprintf(buf, "%u\n", host_control_on_shutdown);
238}
239
240static ssize_t host_control_on_shutdown_store(struct device *dev,
241 struct device_attribute *attr,
242 const char *buf, size_t count)
243{
244 host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
245 return count;
246}
247
248/**
249 * smi_request: generate SMI request
250 *
251 * Called with smi_data_lock.
252 */
253static int smi_request(struct smi_cmd *smi_cmd)
254{
255 cpumask_t old_mask;
256 int ret = 0;
257
258 if (smi_cmd->magic != SMI_CMD_MAGIC) {
259 dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
260 __FUNCTION__);
261 return -EBADR;
262 }
263
264 /* SMI requires CPU 0 */
265 old_mask = current->cpus_allowed;
266 set_cpus_allowed(current, cpumask_of_cpu(0));
267 if (smp_processor_id() != 0) {
268 dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
269 __FUNCTION__);
270 ret = -EBUSY;
271 goto out;
272 }
273
274 /* generate SMI */
275 asm volatile (
276 "outb %b0,%w1"
277 : /* no output args */
278 : "a" (smi_cmd->command_code),
279 "d" (smi_cmd->command_address),
280 "b" (smi_cmd->ebx),
281 "c" (smi_cmd->ecx)
282 : "memory"
283 );
284
285out:
286 set_cpus_allowed(current, old_mask);
287 return ret;
288}
289
290/**
291 * smi_request_store:
292 *
293 * The valid values are:
294 * 0: zero SMI data buffer
295 * 1: generate calling interface SMI
296 * 2: generate raw SMI
297 *
298 * User application writes smi_cmd to smi_data before telling driver
299 * to generate SMI.
300 */
301static ssize_t smi_request_store(struct device *dev,
302 struct device_attribute *attr,
303 const char *buf, size_t count)
304{
305 struct smi_cmd *smi_cmd;
306 unsigned long val = simple_strtoul(buf, NULL, 10);
307 ssize_t ret;
308
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800309 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700310
311 if (smi_data_buf_size < sizeof(struct smi_cmd)) {
312 ret = -ENODEV;
313 goto out;
314 }
315 smi_cmd = (struct smi_cmd *)smi_data_buf;
316
317 switch (val) {
318 case 2:
319 /* Raw SMI */
320 ret = smi_request(smi_cmd);
321 if (!ret)
322 ret = count;
323 break;
324 case 1:
325 /* Calling Interface SMI */
326 smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer);
327 ret = smi_request(smi_cmd);
328 if (!ret)
329 ret = count;
330 break;
331 case 0:
332 memset(smi_data_buf, 0, smi_data_buf_size);
333 ret = count;
334 break;
335 default:
336 ret = -EINVAL;
337 break;
338 }
339
340out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800341 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700342 return ret;
343}
344
345/**
346 * host_control_smi: generate host control SMI
347 *
348 * Caller must set up the host control command in smi_data_buf.
349 */
350static int host_control_smi(void)
351{
352 struct apm_cmd *apm_cmd;
353 u8 *data;
354 unsigned long flags;
355 u32 num_ticks;
356 s8 cmd_status;
357 u8 index;
358
359 apm_cmd = (struct apm_cmd *)smi_data_buf;
360 apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
361
362 switch (host_control_smi_type) {
363 case HC_SMITYPE_TYPE1:
364 spin_lock_irqsave(&rtc_lock, flags);
365 /* write SMI data buffer physical address */
366 data = (u8 *)&smi_data_buf_phys_addr;
367 for (index = PE1300_CMOS_CMD_STRUCT_PTR;
368 index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
369 index++, data++) {
370 outb(index,
371 (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
372 outb(*data,
373 (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
374 }
375
376 /* first set status to -1 as called by spec */
377 cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
378 outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
379
380 /* generate SMM call */
381 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
382 spin_unlock_irqrestore(&rtc_lock, flags);
383
384 /* wait a few to see if it executed */
385 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
386 while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
387 == ESM_STATUS_CMD_UNSUCCESSFUL) {
388 num_ticks--;
389 if (num_ticks == EXPIRED_TIMER)
390 return -ETIME;
391 }
392 break;
393
394 case HC_SMITYPE_TYPE2:
395 case HC_SMITYPE_TYPE3:
396 spin_lock_irqsave(&rtc_lock, flags);
397 /* write SMI data buffer physical address */
398 data = (u8 *)&smi_data_buf_phys_addr;
399 for (index = PE1400_CMOS_CMD_STRUCT_PTR;
400 index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
401 index++, data++) {
402 outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
403 outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
404 }
405
406 /* generate SMM call */
407 if (host_control_smi_type == HC_SMITYPE_TYPE3)
408 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
409 else
410 outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
411
412 /* restore RTC index pointer since it was written to above */
413 CMOS_READ(RTC_REG_C);
414 spin_unlock_irqrestore(&rtc_lock, flags);
415
416 /* read control port back to serialize write */
417 cmd_status = inb(PE1400_APM_CONTROL_PORT);
418
419 /* wait a few to see if it executed */
420 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
421 while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
422 num_ticks--;
423 if (num_ticks == EXPIRED_TIMER)
424 return -ETIME;
425 }
426 break;
427
428 default:
429 dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
430 __FUNCTION__, host_control_smi_type);
431 return -ENOSYS;
432 }
433
434 return 0;
435}
436
437/**
438 * dcdbas_host_control: initiate host control
439 *
440 * This function is called by the driver after the system has
441 * finished shutting down if the user application specified a
442 * host control action to perform on shutdown. It is safe to
443 * use smi_data_buf at this point because the system has finished
444 * shutting down and no userspace apps are running.
445 */
446static void dcdbas_host_control(void)
447{
448 struct apm_cmd *apm_cmd;
449 u8 action;
450
451 if (host_control_action == HC_ACTION_NONE)
452 return;
453
454 action = host_control_action;
455 host_control_action = HC_ACTION_NONE;
456
457 if (!smi_data_buf) {
458 dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __FUNCTION__);
459 return;
460 }
461
462 if (smi_data_buf_size < sizeof(struct apm_cmd)) {
463 dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
464 __FUNCTION__);
465 return;
466 }
467
468 apm_cmd = (struct apm_cmd *)smi_data_buf;
469
470 /* power off takes precedence */
471 if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
472 apm_cmd->command = ESM_APM_POWER_CYCLE;
473 apm_cmd->reserved = 0;
474 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
475 host_control_smi();
476 } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
477 apm_cmd->command = ESM_APM_POWER_CYCLE;
478 apm_cmd->reserved = 0;
479 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
480 host_control_smi();
481 }
482}
483
484/**
485 * dcdbas_reboot_notify: handle reboot notification for host control
486 */
487static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
488 void *unused)
489{
Doug Warzecha90563ec2005-09-06 15:17:15 -0700490 switch (code) {
491 case SYS_DOWN:
492 case SYS_HALT:
493 case SYS_POWER_OFF:
494 if (host_control_on_shutdown) {
495 /* firmware is going to perform host control action */
Alan Sterne041c682006-03-27 01:16:30 -0800496 printk(KERN_WARNING "Please wait for shutdown "
497 "action to complete...\n");
498 dcdbas_host_control();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700499 }
500 break;
501 }
502
503 return NOTIFY_DONE;
504}
505
506static struct notifier_block dcdbas_reboot_nb = {
507 .notifier_call = dcdbas_reboot_notify,
508 .next = NULL,
Alan Sterne041c682006-03-27 01:16:30 -0800509 .priority = INT_MIN
Doug Warzecha90563ec2005-09-06 15:17:15 -0700510};
511
512static DCDBAS_BIN_ATTR_RW(smi_data);
513
514static struct bin_attribute *dcdbas_bin_attrs[] = {
515 &bin_attr_smi_data,
516 NULL
517};
518
519static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
520static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
521static DCDBAS_DEV_ATTR_WO(smi_request);
522static DCDBAS_DEV_ATTR_RW(host_control_action);
523static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
524static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
525
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800526static struct attribute *dcdbas_dev_attrs[] = {
527 &dev_attr_smi_data_buf_size.attr,
528 &dev_attr_smi_data_buf_phys_addr.attr,
529 &dev_attr_smi_request.attr,
530 &dev_attr_host_control_action.attr,
531 &dev_attr_host_control_smi_type.attr,
532 &dev_attr_host_control_on_shutdown.attr,
Doug Warzecha90563ec2005-09-06 15:17:15 -0700533 NULL
534};
535
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800536static struct attribute_group dcdbas_attr_group = {
537 .attrs = dcdbas_dev_attrs,
538};
539
540static int __devinit dcdbas_probe(struct platform_device *dev)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700541{
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800542 int i, error;
Doug Warzecha90563ec2005-09-06 15:17:15 -0700543
544 host_control_action = HC_ACTION_NONE;
545 host_control_smi_type = HC_SMITYPE_NONE;
546
Doug Warzecha90563ec2005-09-06 15:17:15 -0700547 /*
548 * BIOS SMI calls require buffer addresses be in 32-bit address space.
549 * This is done by setting the DMA mask below.
550 */
551 dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
552 dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask;
553
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800554 error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
555 if (error)
556 return error;
557
558 for (i = 0; dcdbas_bin_attrs[i]; i++) {
559 error = sysfs_create_bin_file(&dev->dev.kobj,
560 dcdbas_bin_attrs[i]);
561 if (error) {
562 while (--i >= 0)
563 sysfs_remove_bin_file(&dev->dev.kobj,
564 dcdbas_bin_attrs[i]);
Jeff Garzik0968cf512006-10-10 02:58:14 -0400565 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800566 return error;
567 }
568 }
569
Doug Warzecha90563ec2005-09-06 15:17:15 -0700570 register_reboot_notifier(&dcdbas_reboot_nb);
571
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800572 dev_info(&dev->dev, "%s (version %s)\n",
Doug Warzecha90563ec2005-09-06 15:17:15 -0700573 DRIVER_DESCRIPTION, DRIVER_VERSION);
574
575 return 0;
576}
577
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800578static int __devexit dcdbas_remove(struct platform_device *dev)
579{
580 int i;
581
582 unregister_reboot_notifier(&dcdbas_reboot_nb);
583 for (i = 0; dcdbas_bin_attrs[i]; i++)
584 sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]);
585 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
586
587 return 0;
588}
589
590static struct platform_driver dcdbas_driver = {
591 .driver = {
592 .name = DRIVER_NAME,
593 .owner = THIS_MODULE,
594 },
595 .probe = dcdbas_probe,
596 .remove = __devexit_p(dcdbas_remove),
597};
598
599/**
600 * dcdbas_init: initialize driver
601 */
602static int __init dcdbas_init(void)
603{
604 int error;
605
606 error = platform_driver_register(&dcdbas_driver);
607 if (error)
608 return error;
609
610 dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1);
611 if (!dcdbas_pdev) {
612 error = -ENOMEM;
613 goto err_unregister_driver;
614 }
615
616 error = platform_device_add(dcdbas_pdev);
617 if (error)
618 goto err_free_device;
619
620 return 0;
621
622 err_free_device:
623 platform_device_put(dcdbas_pdev);
624 err_unregister_driver:
625 platform_driver_unregister(&dcdbas_driver);
626 return error;
627}
628
Doug Warzecha90563ec2005-09-06 15:17:15 -0700629/**
630 * dcdbas_exit: perform driver cleanup
631 */
632static void __exit dcdbas_exit(void)
633{
Doug Warzecha435a80f2006-03-09 17:33:35 -0800634 /*
635 * make sure functions that use dcdbas_pdev are called
636 * before platform_device_unregister
637 */
Doug Warzecha90563ec2005-09-06 15:17:15 -0700638 unregister_reboot_notifier(&dcdbas_reboot_nb);
639 smi_data_buf_free();
Doug Warzecha435a80f2006-03-09 17:33:35 -0800640 platform_device_unregister(dcdbas_pdev);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800641 platform_driver_unregister(&dcdbas_driver);
642
643 /*
644 * We have to free the buffer here instead of dcdbas_remove
645 * because only in module exit function we can be sure that
646 * all sysfs attributes belonging to this module have been
647 * released.
648 */
649 smi_data_buf_free();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700650}
651
652module_init(dcdbas_init);
653module_exit(dcdbas_exit);
654
655MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
656MODULE_VERSION(DRIVER_VERSION);
657MODULE_AUTHOR("Dell Inc.");
658MODULE_LICENSE("GPL");
659