blob: aa9bc9e980e1b8a3bbdbe189c16aef8545886fe6 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/gfp.h>
Doug Warzecha90563ec2005-09-06 15:17:15 -070027#include <linux/init.h>
28#include <linux/kernel.h>
29#include <linux/mc146818rtc.h>
30#include <linux/module.h>
31#include <linux/reboot.h>
32#include <linux/sched.h>
33#include <linux/smp.h>
34#include <linux/spinlock.h>
35#include <linux/string.h>
36#include <linux/types.h>
Arjan van de Ven8ed965d2006-03-23 03:00:21 -080037#include <linux/mutex.h>
Doug Warzecha90563ec2005-09-06 15:17:15 -070038#include <asm/io.h>
Doug Warzecha90563ec2005-09-06 15:17:15 -070039
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",
Harvey Harrisoneecd5852008-04-29 00:59:19 -070067 __func__, smi_data_buf_phys_addr, smi_data_buf_size);
Doug Warzecha90563ec2005-09-06 15:17:15 -070068
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",
Harvey Harrisoneecd5852008-04-29 00:59:19 -070096 __func__, size);
Doug Warzecha90563ec2005-09-06 15:17:15 -070097 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",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700114 __func__, smi_data_buf_phys_addr, smi_data_buf_size);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700115
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
Chris Wright2c3c8be2010-05-12 18:28:57 -0700152static ssize_t smi_data_read(struct file *filp, struct kobject *kobj,
Zhang Rui91a69022007-06-09 13:57:22 +0800153 struct bin_attribute *bin_attr,
154 char *buf, loff_t pos, size_t count)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700155{
Doug Warzecha90563ec2005-09-06 15:17:15 -0700156 ssize_t ret;
157
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800158 mutex_lock(&smi_data_lock);
Akinobu Mitaabe19b72008-07-25 01:48:24 -0700159 ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf,
160 smi_data_buf_size);
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800161 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700162 return ret;
163}
164
Chris Wright2c3c8be2010-05-12 18:28:57 -0700165static ssize_t smi_data_write(struct file *filp, struct kobject *kobj,
Zhang Rui91a69022007-06-09 13:57:22 +0800166 struct bin_attribute *bin_attr,
167 char *buf, loff_t pos, size_t count)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700168{
169 ssize_t ret;
170
Doug Warzechab95936c2006-10-19 23:29:09 -0700171 if ((pos + count) > MAX_SMI_DATA_BUF_SIZE)
172 return -EINVAL;
173
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800174 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700175
176 ret = smi_data_buf_realloc(pos + count);
177 if (ret)
178 goto out;
179
180 memcpy(smi_data_buf + pos, buf, count);
181 ret = count;
182out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800183 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700184 return ret;
185}
186
187static ssize_t host_control_action_show(struct device *dev,
188 struct device_attribute *attr,
189 char *buf)
190{
191 return sprintf(buf, "%u\n", host_control_action);
192}
193
194static ssize_t host_control_action_store(struct device *dev,
195 struct device_attribute *attr,
196 const char *buf, size_t count)
197{
198 ssize_t ret;
199
200 /* make sure buffer is available for host control command */
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800201 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700202 ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800203 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700204 if (ret)
205 return ret;
206
207 host_control_action = simple_strtoul(buf, NULL, 10);
208 return count;
209}
210
211static ssize_t host_control_smi_type_show(struct device *dev,
212 struct device_attribute *attr,
213 char *buf)
214{
215 return sprintf(buf, "%u\n", host_control_smi_type);
216}
217
218static ssize_t host_control_smi_type_store(struct device *dev,
219 struct device_attribute *attr,
220 const char *buf, size_t count)
221{
222 host_control_smi_type = simple_strtoul(buf, NULL, 10);
223 return count;
224}
225
226static ssize_t host_control_on_shutdown_show(struct device *dev,
227 struct device_attribute *attr,
228 char *buf)
229{
230 return sprintf(buf, "%u\n", host_control_on_shutdown);
231}
232
233static ssize_t host_control_on_shutdown_store(struct device *dev,
234 struct device_attribute *attr,
235 const char *buf, size_t count)
236{
237 host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
238 return count;
239}
240
241/**
Matthew Garrett3cab7fd2009-01-07 18:08:54 -0800242 * dcdbas_smi_request: generate SMI request
Doug Warzecha90563ec2005-09-06 15:17:15 -0700243 *
244 * Called with smi_data_lock.
245 */
Matthew Garrett3cab7fd2009-01-07 18:08:54 -0800246int dcdbas_smi_request(struct smi_cmd *smi_cmd)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700247{
Mike Travisc90e7852009-01-10 21:58:10 -0800248 cpumask_var_t old_mask;
Doug Warzecha90563ec2005-09-06 15:17:15 -0700249 int ret = 0;
250
251 if (smi_cmd->magic != SMI_CMD_MAGIC) {
252 dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700253 __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700254 return -EBADR;
255 }
256
257 /* SMI requires CPU 0 */
Mike Travisc90e7852009-01-10 21:58:10 -0800258 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
259 return -ENOMEM;
260
261 cpumask_copy(old_mask, &current->cpus_allowed);
262 set_cpus_allowed_ptr(current, cpumask_of(0));
Doug Warzecha90563ec2005-09-06 15:17:15 -0700263 if (smp_processor_id() != 0) {
264 dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700265 __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700266 ret = -EBUSY;
267 goto out;
268 }
269
270 /* generate SMI */
271 asm volatile (
272 "outb %b0,%w1"
273 : /* no output args */
274 : "a" (smi_cmd->command_code),
275 "d" (smi_cmd->command_address),
276 "b" (smi_cmd->ebx),
277 "c" (smi_cmd->ecx)
278 : "memory"
279 );
280
281out:
Mike Travisc90e7852009-01-10 21:58:10 -0800282 set_cpus_allowed_ptr(current, old_mask);
283 free_cpumask_var(old_mask);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700284 return ret;
285}
286
287/**
288 * smi_request_store:
289 *
290 * The valid values are:
291 * 0: zero SMI data buffer
292 * 1: generate calling interface SMI
293 * 2: generate raw SMI
294 *
295 * User application writes smi_cmd to smi_data before telling driver
296 * to generate SMI.
297 */
298static ssize_t smi_request_store(struct device *dev,
299 struct device_attribute *attr,
300 const char *buf, size_t count)
301{
302 struct smi_cmd *smi_cmd;
303 unsigned long val = simple_strtoul(buf, NULL, 10);
304 ssize_t ret;
305
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800306 mutex_lock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700307
308 if (smi_data_buf_size < sizeof(struct smi_cmd)) {
309 ret = -ENODEV;
310 goto out;
311 }
312 smi_cmd = (struct smi_cmd *)smi_data_buf;
313
314 switch (val) {
315 case 2:
316 /* Raw SMI */
Matthew Garrett3cab7fd2009-01-07 18:08:54 -0800317 ret = dcdbas_smi_request(smi_cmd);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700318 if (!ret)
319 ret = count;
320 break;
321 case 1:
322 /* Calling Interface SMI */
323 smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer);
Matthew Garrett3cab7fd2009-01-07 18:08:54 -0800324 ret = dcdbas_smi_request(smi_cmd);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700325 if (!ret)
326 ret = count;
327 break;
328 case 0:
329 memset(smi_data_buf, 0, smi_data_buf_size);
330 ret = count;
331 break;
332 default:
333 ret = -EINVAL;
334 break;
335 }
336
337out:
Arjan van de Ven8ed965d2006-03-23 03:00:21 -0800338 mutex_unlock(&smi_data_lock);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700339 return ret;
340}
Matthew Garrett3cab7fd2009-01-07 18:08:54 -0800341EXPORT_SYMBOL(dcdbas_smi_request);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700342
343/**
344 * host_control_smi: generate host control SMI
345 *
346 * Caller must set up the host control command in smi_data_buf.
347 */
348static int host_control_smi(void)
349{
350 struct apm_cmd *apm_cmd;
351 u8 *data;
352 unsigned long flags;
353 u32 num_ticks;
354 s8 cmd_status;
355 u8 index;
356
357 apm_cmd = (struct apm_cmd *)smi_data_buf;
358 apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
359
360 switch (host_control_smi_type) {
361 case HC_SMITYPE_TYPE1:
362 spin_lock_irqsave(&rtc_lock, flags);
363 /* write SMI data buffer physical address */
364 data = (u8 *)&smi_data_buf_phys_addr;
365 for (index = PE1300_CMOS_CMD_STRUCT_PTR;
366 index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
367 index++, data++) {
368 outb(index,
369 (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
370 outb(*data,
371 (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
372 }
373
374 /* first set status to -1 as called by spec */
375 cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
376 outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
377
378 /* generate SMM call */
379 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
380 spin_unlock_irqrestore(&rtc_lock, flags);
381
382 /* wait a few to see if it executed */
383 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
384 while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
385 == ESM_STATUS_CMD_UNSUCCESSFUL) {
386 num_ticks--;
387 if (num_ticks == EXPIRED_TIMER)
388 return -ETIME;
389 }
390 break;
391
392 case HC_SMITYPE_TYPE2:
393 case HC_SMITYPE_TYPE3:
394 spin_lock_irqsave(&rtc_lock, flags);
395 /* write SMI data buffer physical address */
396 data = (u8 *)&smi_data_buf_phys_addr;
397 for (index = PE1400_CMOS_CMD_STRUCT_PTR;
398 index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
399 index++, data++) {
400 outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
401 outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
402 }
403
404 /* generate SMM call */
405 if (host_control_smi_type == HC_SMITYPE_TYPE3)
406 outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
407 else
408 outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
409
410 /* restore RTC index pointer since it was written to above */
411 CMOS_READ(RTC_REG_C);
412 spin_unlock_irqrestore(&rtc_lock, flags);
413
414 /* read control port back to serialize write */
415 cmd_status = inb(PE1400_APM_CONTROL_PORT);
416
417 /* wait a few to see if it executed */
418 num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
419 while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
420 num_ticks--;
421 if (num_ticks == EXPIRED_TIMER)
422 return -ETIME;
423 }
424 break;
425
426 default:
427 dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700428 __func__, host_control_smi_type);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700429 return -ENOSYS;
430 }
431
432 return 0;
433}
434
435/**
436 * dcdbas_host_control: initiate host control
437 *
438 * This function is called by the driver after the system has
439 * finished shutting down if the user application specified a
440 * host control action to perform on shutdown. It is safe to
441 * use smi_data_buf at this point because the system has finished
442 * shutting down and no userspace apps are running.
443 */
444static void dcdbas_host_control(void)
445{
446 struct apm_cmd *apm_cmd;
447 u8 action;
448
449 if (host_control_action == HC_ACTION_NONE)
450 return;
451
452 action = host_control_action;
453 host_control_action = HC_ACTION_NONE;
454
455 if (!smi_data_buf) {
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700456 dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700457 return;
458 }
459
460 if (smi_data_buf_size < sizeof(struct apm_cmd)) {
461 dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
Harvey Harrisoneecd5852008-04-29 00:59:19 -0700462 __func__);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700463 return;
464 }
465
466 apm_cmd = (struct apm_cmd *)smi_data_buf;
467
468 /* power off takes precedence */
469 if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
470 apm_cmd->command = ESM_APM_POWER_CYCLE;
471 apm_cmd->reserved = 0;
472 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
473 host_control_smi();
474 } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
475 apm_cmd->command = ESM_APM_POWER_CYCLE;
476 apm_cmd->reserved = 0;
477 *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
478 host_control_smi();
479 }
480}
481
482/**
483 * dcdbas_reboot_notify: handle reboot notification for host control
484 */
485static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
486 void *unused)
487{
Doug Warzecha90563ec2005-09-06 15:17:15 -0700488 switch (code) {
489 case SYS_DOWN:
490 case SYS_HALT:
491 case SYS_POWER_OFF:
492 if (host_control_on_shutdown) {
493 /* firmware is going to perform host control action */
Alan Sterne041c682006-03-27 01:16:30 -0800494 printk(KERN_WARNING "Please wait for shutdown "
495 "action to complete...\n");
496 dcdbas_host_control();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700497 }
498 break;
499 }
500
501 return NOTIFY_DONE;
502}
503
504static struct notifier_block dcdbas_reboot_nb = {
505 .notifier_call = dcdbas_reboot_notify,
506 .next = NULL,
Alan Sterne041c682006-03-27 01:16:30 -0800507 .priority = INT_MIN
Doug Warzecha90563ec2005-09-06 15:17:15 -0700508};
509
510static DCDBAS_BIN_ATTR_RW(smi_data);
511
512static struct bin_attribute *dcdbas_bin_attrs[] = {
513 &bin_attr_smi_data,
514 NULL
515};
516
517static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
518static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
519static DCDBAS_DEV_ATTR_WO(smi_request);
520static DCDBAS_DEV_ATTR_RW(host_control_action);
521static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
522static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
523
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800524static struct attribute *dcdbas_dev_attrs[] = {
525 &dev_attr_smi_data_buf_size.attr,
526 &dev_attr_smi_data_buf_phys_addr.attr,
527 &dev_attr_smi_request.attr,
528 &dev_attr_host_control_action.attr,
529 &dev_attr_host_control_smi_type.attr,
530 &dev_attr_host_control_on_shutdown.attr,
Doug Warzecha90563ec2005-09-06 15:17:15 -0700531 NULL
532};
533
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800534static struct attribute_group dcdbas_attr_group = {
535 .attrs = dcdbas_dev_attrs,
536};
537
538static int __devinit dcdbas_probe(struct platform_device *dev)
Doug Warzecha90563ec2005-09-06 15:17:15 -0700539{
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800540 int i, error;
Doug Warzecha90563ec2005-09-06 15:17:15 -0700541
542 host_control_action = HC_ACTION_NONE;
543 host_control_smi_type = HC_SMITYPE_NONE;
544
Doug Warzecha90563ec2005-09-06 15:17:15 -0700545 /*
546 * BIOS SMI calls require buffer addresses be in 32-bit address space.
547 * This is done by setting the DMA mask below.
548 */
Yang Hongyang284901a2009-04-06 19:01:15 -0700549 dcdbas_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
Doug Warzecha90563ec2005-09-06 15:17:15 -0700550 dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask;
551
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800552 error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
553 if (error)
554 return error;
555
556 for (i = 0; dcdbas_bin_attrs[i]; i++) {
557 error = sysfs_create_bin_file(&dev->dev.kobj,
558 dcdbas_bin_attrs[i]);
559 if (error) {
560 while (--i >= 0)
561 sysfs_remove_bin_file(&dev->dev.kobj,
562 dcdbas_bin_attrs[i]);
Jeff Garzik0968cf512006-10-10 02:58:14 -0400563 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800564 return error;
565 }
566 }
567
Doug Warzecha90563ec2005-09-06 15:17:15 -0700568 register_reboot_notifier(&dcdbas_reboot_nb);
569
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800570 dev_info(&dev->dev, "%s (version %s)\n",
Doug Warzecha90563ec2005-09-06 15:17:15 -0700571 DRIVER_DESCRIPTION, DRIVER_VERSION);
572
573 return 0;
574}
575
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800576static int __devexit dcdbas_remove(struct platform_device *dev)
577{
578 int i;
579
580 unregister_reboot_notifier(&dcdbas_reboot_nb);
581 for (i = 0; dcdbas_bin_attrs[i]; i++)
582 sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]);
583 sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
584
585 return 0;
586}
587
588static struct platform_driver dcdbas_driver = {
589 .driver = {
590 .name = DRIVER_NAME,
591 .owner = THIS_MODULE,
592 },
593 .probe = dcdbas_probe,
594 .remove = __devexit_p(dcdbas_remove),
595};
596
597/**
598 * dcdbas_init: initialize driver
599 */
600static int __init dcdbas_init(void)
601{
602 int error;
603
604 error = platform_driver_register(&dcdbas_driver);
605 if (error)
606 return error;
607
608 dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1);
609 if (!dcdbas_pdev) {
610 error = -ENOMEM;
611 goto err_unregister_driver;
612 }
613
614 error = platform_device_add(dcdbas_pdev);
615 if (error)
616 goto err_free_device;
617
618 return 0;
619
620 err_free_device:
621 platform_device_put(dcdbas_pdev);
622 err_unregister_driver:
623 platform_driver_unregister(&dcdbas_driver);
624 return error;
625}
626
Doug Warzecha90563ec2005-09-06 15:17:15 -0700627/**
628 * dcdbas_exit: perform driver cleanup
629 */
630static void __exit dcdbas_exit(void)
631{
Doug Warzecha435a80f2006-03-09 17:33:35 -0800632 /*
633 * make sure functions that use dcdbas_pdev are called
634 * before platform_device_unregister
635 */
Doug Warzecha90563ec2005-09-06 15:17:15 -0700636 unregister_reboot_notifier(&dcdbas_reboot_nb);
637 smi_data_buf_free();
Doug Warzecha435a80f2006-03-09 17:33:35 -0800638 platform_device_unregister(dcdbas_pdev);
Dmitry Torokhova7f3ea72006-03-22 00:07:56 -0800639 platform_driver_unregister(&dcdbas_driver);
640
641 /*
642 * We have to free the buffer here instead of dcdbas_remove
643 * because only in module exit function we can be sure that
644 * all sysfs attributes belonging to this module have been
645 * released.
646 */
647 smi_data_buf_free();
Doug Warzecha90563ec2005-09-06 15:17:15 -0700648}
649
650module_init(dcdbas_init);
651module_exit(dcdbas_exit);
652
653MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
654MODULE_VERSION(DRIVER_VERSION);
655MODULE_AUTHOR("Dell Inc.");
656MODULE_LICENSE("GPL");
Matt Domsch8f47f0b2008-02-06 01:36:24 -0800657/* Any System or BIOS claiming to be by Dell */
658MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*");