blob: 18d65fb42ee71850d0914f5fd44cd6a91eaf3111 [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/**
Matthew Garrett3cab7fd2009-01-07 18:08:54 -0800241 * dcdbas_smi_request: generate SMI request
Doug Warzecha90563ec2005-09-06 15:17:15 -0700242 *
243 * Called with smi_data_lock.
244 */
Matthew Garrett3cab7fd2009-01-07 18:08:54 -0800245int dcdbas_smi_request(struct smi_cmd *smi_cmd)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700246{
Mike Travisc90e7852009-01-10 21:58:10 -0800247 cpumask_var_t old_mask;
Doug Warzecha90563ec2005-09-06 15:17:15 -0700248 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 */
Mike Travisc90e7852009-01-10 21:58:10 -0800257 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
258 return -ENOMEM;
259
260 cpumask_copy(old_mask, &current->cpus_allowed);
261 set_cpus_allowed_ptr(current, cpumask_of(0));
Doug Warzecha90563ec2005-09-06 15:17:15 -0700262 if (smp_processor_id() != 0) {
263 dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700264 __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700265 ret = -EBUSY;
266 goto out;
267 }
268
269 /* generate SMI */
270 asm volatile (
271 "outb %b0,%w1"
272 : /* no output args */
273 : "a" (smi_cmd->command_code),
274 "d" (smi_cmd->command_address),
275 "b" (smi_cmd->ebx),
276 "c" (smi_cmd->ecx)
277 : "memory"
278 );
279
280out:
Mike Travisc90e7852009-01-10 21:58:10 -0800281 set_cpus_allowed_ptr(current, old_mask);
282 free_cpumask_var(old_mask);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700283 return ret;
284}
285
286/**
287 * smi_request_store:
288 *
289 * The valid values are:
290 * 0: zero SMI data buffer
291 * 1: generate calling interface SMI
292 * 2: generate raw SMI
293 *
294 * User application writes smi_cmd to smi_data before telling driver
295 * to generate SMI.
296 */
297static ssize_t smi_request_store(struct device *dev,
298 struct device_attribute *attr,
299 const char *buf, size_t count)
300{
301 struct smi_cmd *smi_cmd;
302 unsigned long val = simple_strtoul(buf, NULL, 10);
303 ssize_t ret;
304
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800305 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700306
307 if (smi_data_buf_size < sizeof(struct smi_cmd)) {
308 ret = -ENODEV;
309 goto out;
310 }
311 smi_cmd = (struct smi_cmd *)smi_data_buf;
312
313 switch (val) {
314 case 2:
315 /* Raw SMI */
Matthew Garrett3cab7fd2009-01-07 18:08:54 -0800316 ret = dcdbas_smi_request(smi_cmd);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700317 if (!ret)
318 ret = count;
319 break;
320 case 1:
321 /* Calling Interface SMI */
322 smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer);
Matthew Garrett3cab7fd2009-01-07 18:08:54 -0800323 ret = dcdbas_smi_request(smi_cmd);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700324 if (!ret)
325 ret = count;
326 break;
327 case 0:
328 memset(smi_data_buf, 0, smi_data_buf_size);
329 ret = count;
330 break;
331 default:
332 ret = -EINVAL;
333 break;
334 }
335
336out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800337 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700338 return ret;
339}
Matthew Garrett3cab7fd2009-01-07 18:08:54 -0800340EXPORT_SYMBOL(dcdbas_smi_request);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700341
342/**
343 * host_control_smi: generate host control SMI
344 *
345 * Caller must set up the host control command in smi_data_buf.
346 */
347static int host_control_smi(void)
348{
349 struct apm_cmd *apm_cmd;
350 u8 *data;
351 unsigned long flags;
352 u32 num_ticks;
353 s8 cmd_status;
354 u8 index;
355
356 apm_cmd = (struct apm_cmd *)smi_data_buf;
357 apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
358
359 switch (host_control_smi_type) {
360 case HC_SMITYPE_TYPE1:
361 spin_lock_irqsave(&rtc_lock, flags);
362 /* write SMI data buffer physical address */
363 data = (u8 *)&smi_data_buf_phys_addr;
364 for (index = PE1300_CMOS_CMD_STRUCT_PTR;
365 index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
366 index++, data++) {
367 outb(index,
368 (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
369 outb(*data,
370 (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
371 }
372
373 /* first set status to -1 as called by spec */
374 cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
375 outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
376
377 /* generate SMM call */
378 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
379 spin_unlock_irqrestore(&rtc_lock, flags);
380
381 /* wait a few to see if it executed */
382 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
383 while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
384 == ESM_STATUS_CMD_UNSUCCESSFUL) {
385 num_ticks--;
386 if (num_ticks == EXPIRED_TIMER)
387 return -ETIME;
388 }
389 break;
390
391 case HC_SMITYPE_TYPE2:
392 case HC_SMITYPE_TYPE3:
393 spin_lock_irqsave(&rtc_lock, flags);
394 /* write SMI data buffer physical address */
395 data = (u8 *)&smi_data_buf_phys_addr;
396 for (index = PE1400_CMOS_CMD_STRUCT_PTR;
397 index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
398 index++, data++) {
399 outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
400 outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
401 }
402
403 /* generate SMM call */
404 if (host_control_smi_type == HC_SMITYPE_TYPE3)
405 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
406 else
407 outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
408
409 /* restore RTC index pointer since it was written to above */
410 CMOS_READ(RTC_REG_C);
411 spin_unlock_irqrestore(&rtc_lock, flags);
412
413 /* read control port back to serialize write */
414 cmd_status = inb(PE1400_APM_CONTROL_PORT);
415
416 /* wait a few to see if it executed */
417 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
418 while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
419 num_ticks--;
420 if (num_ticks == EXPIRED_TIMER)
421 return -ETIME;
422 }
423 break;
424
425 default:
426 dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700427 __func__, host_control_smi_type);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700428 return -ENOSYS;
429 }
430
431 return 0;
432}
433
434/**
435 * dcdbas_host_control: initiate host control
436 *
437 * This function is called by the driver after the system has
438 * finished shutting down if the user application specified a
439 * host control action to perform on shutdown. It is safe to
440 * use smi_data_buf at this point because the system has finished
441 * shutting down and no userspace apps are running.
442 */
443static void dcdbas_host_control(void)
444{
445 struct apm_cmd *apm_cmd;
446 u8 action;
447
448 if (host_control_action == HC_ACTION_NONE)
449 return;
450
451 action = host_control_action;
452 host_control_action = HC_ACTION_NONE;
453
454 if (!smi_data_buf) {
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700455 dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700456 return;
457 }
458
459 if (smi_data_buf_size < sizeof(struct apm_cmd)) {
460 dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700461 __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700462 return;
463 }
464
465 apm_cmd = (struct apm_cmd *)smi_data_buf;
466
467 /* power off takes precedence */
468 if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
469 apm_cmd->command = ESM_APM_POWER_CYCLE;
470 apm_cmd->reserved = 0;
471 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
472 host_control_smi();
473 } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
474 apm_cmd->command = ESM_APM_POWER_CYCLE;
475 apm_cmd->reserved = 0;
476 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
477 host_control_smi();
478 }
479}
480
481/**
482 * dcdbas_reboot_notify: handle reboot notification for host control
483 */
484static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
485 void *unused)
486{
Doug Warzecha90563ec2005-09-06 15:17:15 -0700487 switch (code) {
488 case SYS_DOWN:
489 case SYS_HALT:
490 case SYS_POWER_OFF:
491 if (host_control_on_shutdown) {
492 /* firmware is going to perform host control action */
Alan Sterne041c682006-03-27 01:16:30 -0800493 printk(KERN_WARNING "Please wait for shutdown "
494 "action to complete...\n");
495 dcdbas_host_control();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700496 }
497 break;
498 }
499
500 return NOTIFY_DONE;
501}
502
503static struct notifier_block dcdbas_reboot_nb = {
504 .notifier_call = dcdbas_reboot_notify,
505 .next = NULL,
Alan Sterne041c682006-03-27 01:16:30 -0800506 .priority = INT_MIN
Doug Warzecha90563ec2005-09-06 15:17:15 -0700507};
508
509static DCDBAS_BIN_ATTR_RW(smi_data);
510
511static struct bin_attribute *dcdbas_bin_attrs[] = {
512 &bin_attr_smi_data,
513 NULL
514};
515
516static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
517static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
518static DCDBAS_DEV_ATTR_WO(smi_request);
519static DCDBAS_DEV_ATTR_RW(host_control_action);
520static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
521static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
522
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800523static struct attribute *dcdbas_dev_attrs[] = {
524 &dev_attr_smi_data_buf_size.attr,
525 &dev_attr_smi_data_buf_phys_addr.attr,
526 &dev_attr_smi_request.attr,
527 &dev_attr_host_control_action.attr,
528 &dev_attr_host_control_smi_type.attr,
529 &dev_attr_host_control_on_shutdown.attr,
Doug Warzecha90563ec2005-09-06 15:17:15 -0700530 NULL
531};
532
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800533static struct attribute_group dcdbas_attr_group = {
534 .attrs = dcdbas_dev_attrs,
535};
536
537static int __devinit dcdbas_probe(struct platform_device *dev)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700538{
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800539 int i, error;
Doug Warzecha90563ec2005-09-06 15:17:15 -0700540
541 host_control_action = HC_ACTION_NONE;
542 host_control_smi_type = HC_SMITYPE_NONE;
543
Doug Warzecha90563ec2005-09-06 15:17:15 -0700544 /*
545 * BIOS SMI calls require buffer addresses be in 32-bit address space.
546 * This is done by setting the DMA mask below.
547 */
Yang Hongyang284901a2009-04-06 19:01:15 -0700548 dcdbas_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700549 dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask;
550
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800551 error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
552 if (error)
553 return error;
554
555 for (i = 0; dcdbas_bin_attrs[i]; i++) {
556 error = sysfs_create_bin_file(&dev->dev.kobj,
557 dcdbas_bin_attrs[i]);
558 if (error) {
559 while (--i >= 0)
560 sysfs_remove_bin_file(&dev->dev.kobj,
561 dcdbas_bin_attrs[i]);
Jeff Garzik0968cf512006-10-10 02:58:14 -0400562 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800563 return error;
564 }
565 }
566
Doug Warzecha90563ec2005-09-06 15:17:15 -0700567 register_reboot_notifier(&dcdbas_reboot_nb);
568
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800569 dev_info(&dev->dev, "%s (version %s)\n",
Doug Warzecha90563ec2005-09-06 15:17:15 -0700570 DRIVER_DESCRIPTION, DRIVER_VERSION);
571
572 return 0;
573}
574
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800575static int __devexit dcdbas_remove(struct platform_device *dev)
576{
577 int i;
578
579 unregister_reboot_notifier(&dcdbas_reboot_nb);
580 for (i = 0; dcdbas_bin_attrs[i]; i++)
581 sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]);
582 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
583
584 return 0;
585}
586
587static struct platform_driver dcdbas_driver = {
588 .driver = {
589 .name = DRIVER_NAME,
590 .owner = THIS_MODULE,
591 },
592 .probe = dcdbas_probe,
593 .remove = __devexit_p(dcdbas_remove),
594};
595
596/**
597 * dcdbas_init: initialize driver
598 */
599static int __init dcdbas_init(void)
600{
601 int error;
602
603 error = platform_driver_register(&dcdbas_driver);
604 if (error)
605 return error;
606
607 dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1);
608 if (!dcdbas_pdev) {
609 error = -ENOMEM;
610 goto err_unregister_driver;
611 }
612
613 error = platform_device_add(dcdbas_pdev);
614 if (error)
615 goto err_free_device;
616
617 return 0;
618
619 err_free_device:
620 platform_device_put(dcdbas_pdev);
621 err_unregister_driver:
622 platform_driver_unregister(&dcdbas_driver);
623 return error;
624}
625
Doug Warzecha90563ec2005-09-06 15:17:15 -0700626/**
627 * dcdbas_exit: perform driver cleanup
628 */
629static void __exit dcdbas_exit(void)
630{
Doug Warzecha435a80f2006-03-09 17:33:35 -0800631 /*
632 * make sure functions that use dcdbas_pdev are called
633 * before platform_device_unregister
634 */
Doug Warzecha90563ec2005-09-06 15:17:15 -0700635 unregister_reboot_notifier(&dcdbas_reboot_nb);
636 smi_data_buf_free();
Doug Warzecha435a80f2006-03-09 17:33:35 -0800637 platform_device_unregister(dcdbas_pdev);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800638 platform_driver_unregister(&dcdbas_driver);
639
640 /*
641 * We have to free the buffer here instead of dcdbas_remove
642 * because only in module exit function we can be sure that
643 * all sysfs attributes belonging to this module have been
644 * released.
645 */
646 smi_data_buf_free();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700647}
648
649module_init(dcdbas_init);
650module_exit(dcdbas_exit);
651
652MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
653MODULE_VERSION(DRIVER_VERSION);
654MODULE_AUTHOR("Dell Inc.");
655MODULE_LICENSE("GPL");
Matt Domsch8f47f0b2008-02-06 01:36:24 -0800656/* Any System or BIOS claiming to be by Dell */
657MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*");