blob: 50a071f1c945c0c3d8079ffdf713c577315a8415 [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>
Doug Warzecha90563ec2005-09-06 15:17:15 -070038
39#include "dcdbas.h"
40
41#define DRIVER_NAME "dcdbas"
Doug Warzechab95936c2006-10-19 23:29:09 -070042#define DRIVER_VERSION "5.6.0-3.2"
Doug Warzecha90563ec2005-09-06 15:17:15 -070043#define DRIVER_DESCRIPTION "Dell Systems Management Base Driver"
44
45static struct platform_device *dcdbas_pdev;
46
47static u8 *smi_data_buf;
48static dma_addr_t smi_data_buf_handle;
49static unsigned long smi_data_buf_size;
50static u32 smi_data_buf_phys_addr;
Arjan van de Ven8ed965d2006-03-23 03:00:21 -080051static DEFINE_MUTEX(smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -070052
53static unsigned int host_control_action;
54static unsigned int host_control_smi_type;
55static unsigned int host_control_on_shutdown;
56
57/**
58 * smi_data_buf_free: free SMI data buffer
59 */
60static void smi_data_buf_free(void)
61{
62 if (!smi_data_buf)
63 return;
64
65 dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -070066 __func__, smi_data_buf_phys_addr, smi_data_buf_size);
Doug Warzecha90563ec2005-09-06 15:17:15 -070067
68 dma_free_coherent(&dcdbas_pdev->dev, smi_data_buf_size, smi_data_buf,
69 smi_data_buf_handle);
70 smi_data_buf = NULL;
71 smi_data_buf_handle = 0;
72 smi_data_buf_phys_addr = 0;
73 smi_data_buf_size = 0;
74}
75
76/**
77 * smi_data_buf_realloc: grow SMI data buffer if needed
78 */
79static int smi_data_buf_realloc(unsigned long size)
80{
81 void *buf;
82 dma_addr_t handle;
83
84 if (smi_data_buf_size >= size)
85 return 0;
86
87 if (size > MAX_SMI_DATA_BUF_SIZE)
88 return -EINVAL;
89
90 /* new buffer is needed */
91 buf = dma_alloc_coherent(&dcdbas_pdev->dev, size, &handle, GFP_KERNEL);
92 if (!buf) {
93 dev_dbg(&dcdbas_pdev->dev,
94 "%s: failed to allocate memory size %lu\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -070095 __func__, size);
Doug Warzecha90563ec2005-09-06 15:17:15 -070096 return -ENOMEM;
97 }
98 /* memory zeroed by dma_alloc_coherent */
99
100 if (smi_data_buf)
101 memcpy(buf, smi_data_buf, smi_data_buf_size);
102
103 /* free any existing buffer */
104 smi_data_buf_free();
105
106 /* set up new buffer for use */
107 smi_data_buf = buf;
108 smi_data_buf_handle = handle;
109 smi_data_buf_phys_addr = (u32) virt_to_phys(buf);
110 smi_data_buf_size = size;
111
112 dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700113 __func__, smi_data_buf_phys_addr, smi_data_buf_size);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700114
115 return 0;
116}
117
118static ssize_t smi_data_buf_phys_addr_show(struct device *dev,
119 struct device_attribute *attr,
120 char *buf)
121{
122 return sprintf(buf, "%x\n", smi_data_buf_phys_addr);
123}
124
125static ssize_t smi_data_buf_size_show(struct device *dev,
126 struct device_attribute *attr,
127 char *buf)
128{
129 return sprintf(buf, "%lu\n", smi_data_buf_size);
130}
131
132static ssize_t smi_data_buf_size_store(struct device *dev,
133 struct device_attribute *attr,
134 const char *buf, size_t count)
135{
136 unsigned long buf_size;
137 ssize_t ret;
138
139 buf_size = simple_strtoul(buf, NULL, 10);
140
141 /* make sure SMI data buffer is at least buf_size */
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800142 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700143 ret = smi_data_buf_realloc(buf_size);
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800144 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700145 if (ret)
146 return ret;
147
148 return count;
149}
150
Zhang Rui91a69022007-06-09 13:57:22 +0800151static ssize_t smi_data_read(struct kobject *kobj,
152 struct bin_attribute *bin_attr,
153 char *buf, loff_t pos, size_t count)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700154{
Doug Warzecha90563ec2005-09-06 15:17:15 -0700155 ssize_t ret;
156
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800157 mutex_lock(&smi_data_lock);
Akinobu Mitaabe19b72008-07-25 01:48:24 -0700158 ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf,
159 smi_data_buf_size);
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800160 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700161 return ret;
162}
163
Zhang Rui91a69022007-06-09 13:57:22 +0800164static ssize_t smi_data_write(struct kobject *kobj,
165 struct bin_attribute *bin_attr,
166 char *buf, loff_t pos, size_t count)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700167{
168 ssize_t ret;
169
Doug Warzechab95936c2006-10-19 23:29:09 -0700170 if ((pos + count) > MAX_SMI_DATA_BUF_SIZE)
171 return -EINVAL;
172
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800173 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700174
175 ret = smi_data_buf_realloc(pos + count);
176 if (ret)
177 goto out;
178
179 memcpy(smi_data_buf + pos, buf, count);
180 ret = count;
181out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800182 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700183 return ret;
184}
185
186static ssize_t host_control_action_show(struct device *dev,
187 struct device_attribute *attr,
188 char *buf)
189{
190 return sprintf(buf, "%u\n", host_control_action);
191}
192
193static ssize_t host_control_action_store(struct device *dev,
194 struct device_attribute *attr,
195 const char *buf, size_t count)
196{
197 ssize_t ret;
198
199 /* make sure buffer is available for host control command */
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800200 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700201 ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800202 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700203 if (ret)
204 return ret;
205
206 host_control_action = simple_strtoul(buf, NULL, 10);
207 return count;
208}
209
210static ssize_t host_control_smi_type_show(struct device *dev,
211 struct device_attribute *attr,
212 char *buf)
213{
214 return sprintf(buf, "%u\n", host_control_smi_type);
215}
216
217static ssize_t host_control_smi_type_store(struct device *dev,
218 struct device_attribute *attr,
219 const char *buf, size_t count)
220{
221 host_control_smi_type = simple_strtoul(buf, NULL, 10);
222 return count;
223}
224
225static ssize_t host_control_on_shutdown_show(struct device *dev,
226 struct device_attribute *attr,
227 char *buf)
228{
229 return sprintf(buf, "%u\n", host_control_on_shutdown);
230}
231
232static ssize_t host_control_on_shutdown_store(struct device *dev,
233 struct device_attribute *attr,
234 const char *buf, size_t count)
235{
236 host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
237 return count;
238}
239
240/**
241 * smi_request: generate SMI request
242 *
243 * Called with smi_data_lock.
244 */
245static int smi_request(struct smi_cmd *smi_cmd)
246{
247 cpumask_t old_mask;
248 int ret = 0;
249
250 if (smi_cmd->magic != SMI_CMD_MAGIC) {
251 dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700252 __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700253 return -EBADR;
254 }
255
256 /* SMI requires CPU 0 */
257 old_mask = current->cpus_allowed;
Mike Travis0bc3cc02008-07-24 18:21:31 -0700258 set_cpus_allowed_ptr(current, &cpumask_of_cpu(0));
Doug Warzecha90563ec2005-09-06 15:17:15 -0700259 if (smp_processor_id() != 0) {
260 dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700261 __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700262 ret = -EBUSY;
263 goto out;
264 }
265
266 /* generate SMI */
267 asm volatile (
268 "outb %b0,%w1"
269 : /* no output args */
270 : "a" (smi_cmd->command_code),
271 "d" (smi_cmd->command_address),
272 "b" (smi_cmd->ebx),
273 "c" (smi_cmd->ecx)
274 : "memory"
275 );
276
277out:
Mike Travisf70316d2008-04-04 18:11:06 -0700278 set_cpus_allowed_ptr(current, &old_mask);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700279 return ret;
280}
281
282/**
283 * smi_request_store:
284 *
285 * The valid values are:
286 * 0: zero SMI data buffer
287 * 1: generate calling interface SMI
288 * 2: generate raw SMI
289 *
290 * User application writes smi_cmd to smi_data before telling driver
291 * to generate SMI.
292 */
293static ssize_t smi_request_store(struct device *dev,
294 struct device_attribute *attr,
295 const char *buf, size_t count)
296{
297 struct smi_cmd *smi_cmd;
298 unsigned long val = simple_strtoul(buf, NULL, 10);
299 ssize_t ret;
300
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800301 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700302
303 if (smi_data_buf_size < sizeof(struct smi_cmd)) {
304 ret = -ENODEV;
305 goto out;
306 }
307 smi_cmd = (struct smi_cmd *)smi_data_buf;
308
309 switch (val) {
310 case 2:
311 /* Raw SMI */
312 ret = smi_request(smi_cmd);
313 if (!ret)
314 ret = count;
315 break;
316 case 1:
317 /* Calling Interface SMI */
318 smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer);
319 ret = smi_request(smi_cmd);
320 if (!ret)
321 ret = count;
322 break;
323 case 0:
324 memset(smi_data_buf, 0, smi_data_buf_size);
325 ret = count;
326 break;
327 default:
328 ret = -EINVAL;
329 break;
330 }
331
332out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800333 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700334 return ret;
335}
336
337/**
338 * host_control_smi: generate host control SMI
339 *
340 * Caller must set up the host control command in smi_data_buf.
341 */
342static int host_control_smi(void)
343{
344 struct apm_cmd *apm_cmd;
345 u8 *data;
346 unsigned long flags;
347 u32 num_ticks;
348 s8 cmd_status;
349 u8 index;
350
351 apm_cmd = (struct apm_cmd *)smi_data_buf;
352 apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
353
354 switch (host_control_smi_type) {
355 case HC_SMITYPE_TYPE1:
356 spin_lock_irqsave(&rtc_lock, flags);
357 /* write SMI data buffer physical address */
358 data = (u8 *)&smi_data_buf_phys_addr;
359 for (index = PE1300_CMOS_CMD_STRUCT_PTR;
360 index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
361 index++, data++) {
362 outb(index,
363 (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
364 outb(*data,
365 (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
366 }
367
368 /* first set status to -1 as called by spec */
369 cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
370 outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
371
372 /* generate SMM call */
373 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
374 spin_unlock_irqrestore(&rtc_lock, flags);
375
376 /* wait a few to see if it executed */
377 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
378 while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
379 == ESM_STATUS_CMD_UNSUCCESSFUL) {
380 num_ticks--;
381 if (num_ticks == EXPIRED_TIMER)
382 return -ETIME;
383 }
384 break;
385
386 case HC_SMITYPE_TYPE2:
387 case HC_SMITYPE_TYPE3:
388 spin_lock_irqsave(&rtc_lock, flags);
389 /* write SMI data buffer physical address */
390 data = (u8 *)&smi_data_buf_phys_addr;
391 for (index = PE1400_CMOS_CMD_STRUCT_PTR;
392 index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
393 index++, data++) {
394 outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
395 outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
396 }
397
398 /* generate SMM call */
399 if (host_control_smi_type == HC_SMITYPE_TYPE3)
400 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
401 else
402 outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
403
404 /* restore RTC index pointer since it was written to above */
405 CMOS_READ(RTC_REG_C);
406 spin_unlock_irqrestore(&rtc_lock, flags);
407
408 /* read control port back to serialize write */
409 cmd_status = inb(PE1400_APM_CONTROL_PORT);
410
411 /* wait a few to see if it executed */
412 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
413 while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
414 num_ticks--;
415 if (num_ticks == EXPIRED_TIMER)
416 return -ETIME;
417 }
418 break;
419
420 default:
421 dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700422 __func__, host_control_smi_type);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700423 return -ENOSYS;
424 }
425
426 return 0;
427}
428
429/**
430 * dcdbas_host_control: initiate host control
431 *
432 * This function is called by the driver after the system has
433 * finished shutting down if the user application specified a
434 * host control action to perform on shutdown. It is safe to
435 * use smi_data_buf at this point because the system has finished
436 * shutting down and no userspace apps are running.
437 */
438static void dcdbas_host_control(void)
439{
440 struct apm_cmd *apm_cmd;
441 u8 action;
442
443 if (host_control_action == HC_ACTION_NONE)
444 return;
445
446 action = host_control_action;
447 host_control_action = HC_ACTION_NONE;
448
449 if (!smi_data_buf) {
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700450 dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700451 return;
452 }
453
454 if (smi_data_buf_size < sizeof(struct apm_cmd)) {
455 dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700456 __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700457 return;
458 }
459
460 apm_cmd = (struct apm_cmd *)smi_data_buf;
461
462 /* power off takes precedence */
463 if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
464 apm_cmd->command = ESM_APM_POWER_CYCLE;
465 apm_cmd->reserved = 0;
466 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
467 host_control_smi();
468 } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
469 apm_cmd->command = ESM_APM_POWER_CYCLE;
470 apm_cmd->reserved = 0;
471 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
472 host_control_smi();
473 }
474}
475
476/**
477 * dcdbas_reboot_notify: handle reboot notification for host control
478 */
479static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
480 void *unused)
481{
Doug Warzecha90563ec2005-09-06 15:17:15 -0700482 switch (code) {
483 case SYS_DOWN:
484 case SYS_HALT:
485 case SYS_POWER_OFF:
486 if (host_control_on_shutdown) {
487 /* firmware is going to perform host control action */
Alan Sterne041c682006-03-27 01:16:30 -0800488 printk(KERN_WARNING "Please wait for shutdown "
489 "action to complete...\n");
490 dcdbas_host_control();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700491 }
492 break;
493 }
494
495 return NOTIFY_DONE;
496}
497
498static struct notifier_block dcdbas_reboot_nb = {
499 .notifier_call = dcdbas_reboot_notify,
500 .next = NULL,
Alan Sterne041c682006-03-27 01:16:30 -0800501 .priority = INT_MIN
Doug Warzecha90563ec2005-09-06 15:17:15 -0700502};
503
504static DCDBAS_BIN_ATTR_RW(smi_data);
505
506static struct bin_attribute *dcdbas_bin_attrs[] = {
507 &bin_attr_smi_data,
508 NULL
509};
510
511static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
512static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
513static DCDBAS_DEV_ATTR_WO(smi_request);
514static DCDBAS_DEV_ATTR_RW(host_control_action);
515static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
516static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
517
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800518static struct attribute *dcdbas_dev_attrs[] = {
519 &dev_attr_smi_data_buf_size.attr,
520 &dev_attr_smi_data_buf_phys_addr.attr,
521 &dev_attr_smi_request.attr,
522 &dev_attr_host_control_action.attr,
523 &dev_attr_host_control_smi_type.attr,
524 &dev_attr_host_control_on_shutdown.attr,
Doug Warzecha90563ec2005-09-06 15:17:15 -0700525 NULL
526};
527
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800528static struct attribute_group dcdbas_attr_group = {
529 .attrs = dcdbas_dev_attrs,
530};
531
532static int __devinit dcdbas_probe(struct platform_device *dev)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700533{
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800534 int i, error;
Doug Warzecha90563ec2005-09-06 15:17:15 -0700535
536 host_control_action = HC_ACTION_NONE;
537 host_control_smi_type = HC_SMITYPE_NONE;
538
Doug Warzecha90563ec2005-09-06 15:17:15 -0700539 /*
540 * BIOS SMI calls require buffer addresses be in 32-bit address space.
541 * This is done by setting the DMA mask below.
542 */
543 dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
544 dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask;
545
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800546 error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
547 if (error)
548 return error;
549
550 for (i = 0; dcdbas_bin_attrs[i]; i++) {
551 error = sysfs_create_bin_file(&dev->dev.kobj,
552 dcdbas_bin_attrs[i]);
553 if (error) {
554 while (--i >= 0)
555 sysfs_remove_bin_file(&dev->dev.kobj,
556 dcdbas_bin_attrs[i]);
Jeff Garzik0968cf512006-10-10 02:58:14 -0400557 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800558 return error;
559 }
560 }
561
Doug Warzecha90563ec2005-09-06 15:17:15 -0700562 register_reboot_notifier(&dcdbas_reboot_nb);
563
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800564 dev_info(&dev->dev, "%s (version %s)\n",
Doug Warzecha90563ec2005-09-06 15:17:15 -0700565 DRIVER_DESCRIPTION, DRIVER_VERSION);
566
567 return 0;
568}
569
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800570static int __devexit dcdbas_remove(struct platform_device *dev)
571{
572 int i;
573
574 unregister_reboot_notifier(&dcdbas_reboot_nb);
575 for (i = 0; dcdbas_bin_attrs[i]; i++)
576 sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]);
577 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
578
579 return 0;
580}
581
582static struct platform_driver dcdbas_driver = {
583 .driver = {
584 .name = DRIVER_NAME,
585 .owner = THIS_MODULE,
586 },
587 .probe = dcdbas_probe,
588 .remove = __devexit_p(dcdbas_remove),
589};
590
591/**
592 * dcdbas_init: initialize driver
593 */
594static int __init dcdbas_init(void)
595{
596 int error;
597
598 error = platform_driver_register(&dcdbas_driver);
599 if (error)
600 return error;
601
602 dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1);
603 if (!dcdbas_pdev) {
604 error = -ENOMEM;
605 goto err_unregister_driver;
606 }
607
608 error = platform_device_add(dcdbas_pdev);
609 if (error)
610 goto err_free_device;
611
612 return 0;
613
614 err_free_device:
615 platform_device_put(dcdbas_pdev);
616 err_unregister_driver:
617 platform_driver_unregister(&dcdbas_driver);
618 return error;
619}
620
Doug Warzecha90563ec2005-09-06 15:17:15 -0700621/**
622 * dcdbas_exit: perform driver cleanup
623 */
624static void __exit dcdbas_exit(void)
625{
Doug Warzecha435a80f2006-03-09 17:33:35 -0800626 /*
627 * make sure functions that use dcdbas_pdev are called
628 * before platform_device_unregister
629 */
Doug Warzecha90563ec2005-09-06 15:17:15 -0700630 unregister_reboot_notifier(&dcdbas_reboot_nb);
631 smi_data_buf_free();
Doug Warzecha435a80f2006-03-09 17:33:35 -0800632 platform_device_unregister(dcdbas_pdev);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800633 platform_driver_unregister(&dcdbas_driver);
634
635 /*
636 * We have to free the buffer here instead of dcdbas_remove
637 * because only in module exit function we can be sure that
638 * all sysfs attributes belonging to this module have been
639 * released.
640 */
641 smi_data_buf_free();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700642}
643
644module_init(dcdbas_init);
645module_exit(dcdbas_exit);
646
647MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
648MODULE_VERSION(DRIVER_VERSION);
649MODULE_AUTHOR("Dell Inc.");
650MODULE_LICENSE("GPL");
Matt Domsch8f47f0b2008-02-06 01:36:24 -0800651/* Any System or BIOS claiming to be by Dell */
652MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*");