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90563ec4 DW |
1 | /* |
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 | * | |
b95936cb | 11 | * Copyright (C) 1995-2006 Dell Inc. |
90563ec4 DW |
12 | * |
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 | ||
d052d1be | 23 | #include <linux/platform_device.h> |
90563ec4 DW |
24 | #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> | |
8ed965d6 | 36 | #include <linux/mutex.h> |
90563ec4 | 37 | #include <asm/io.h> |
90563ec4 DW |
38 | |
39 | #include "dcdbas.h" | |
40 | ||
41 | #define DRIVER_NAME "dcdbas" | |
b95936cb | 42 | #define DRIVER_VERSION "5.6.0-3.2" |
90563ec4 DW |
43 | #define DRIVER_DESCRIPTION "Dell Systems Management Base Driver" |
44 | ||
45 | static struct platform_device *dcdbas_pdev; | |
46 | ||
47 | static u8 *smi_data_buf; | |
48 | static dma_addr_t smi_data_buf_handle; | |
49 | static unsigned long smi_data_buf_size; | |
50 | static u32 smi_data_buf_phys_addr; | |
8ed965d6 | 51 | static DEFINE_MUTEX(smi_data_lock); |
90563ec4 DW |
52 | |
53 | static unsigned int host_control_action; | |
54 | static unsigned int host_control_smi_type; | |
55 | static unsigned int host_control_on_shutdown; | |
56 | ||
57 | /** | |
58 | * smi_data_buf_free: free SMI data buffer | |
59 | */ | |
60 | static 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", | |
66 | __FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size); | |
67 | ||
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 | */ | |
79 | static 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", | |
95 | __FUNCTION__, size); | |
96 | 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", | |
113 | __FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static 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 | ||
125 | static 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 | ||
132 | static 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 */ | |
8ed965d6 | 142 | mutex_lock(&smi_data_lock); |
90563ec4 | 143 | ret = smi_data_buf_realloc(buf_size); |
8ed965d6 | 144 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
145 | if (ret) |
146 | return ret; | |
147 | ||
148 | return count; | |
149 | } | |
150 | ||
91a69029 ZR |
151 | static ssize_t smi_data_read(struct kobject *kobj, |
152 | struct bin_attribute *bin_attr, | |
153 | char *buf, loff_t pos, size_t count) | |
90563ec4 DW |
154 | { |
155 | size_t max_read; | |
156 | ssize_t ret; | |
157 | ||
8ed965d6 | 158 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
159 | |
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); | |
168 | out: | |
8ed965d6 | 169 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
170 | return ret; |
171 | } | |
172 | ||
91a69029 ZR |
173 | static ssize_t smi_data_write(struct kobject *kobj, |
174 | struct bin_attribute *bin_attr, | |
175 | char *buf, loff_t pos, size_t count) | |
90563ec4 DW |
176 | { |
177 | ssize_t ret; | |
178 | ||
b95936cb DW |
179 | if ((pos + count) > MAX_SMI_DATA_BUF_SIZE) |
180 | return -EINVAL; | |
181 | ||
8ed965d6 | 182 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
183 | |
184 | ret = smi_data_buf_realloc(pos + count); | |
185 | if (ret) | |
186 | goto out; | |
187 | ||
188 | memcpy(smi_data_buf + pos, buf, count); | |
189 | ret = count; | |
190 | out: | |
8ed965d6 | 191 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
192 | return ret; |
193 | } | |
194 | ||
195 | static ssize_t host_control_action_show(struct device *dev, | |
196 | struct device_attribute *attr, | |
197 | char *buf) | |
198 | { | |
199 | return sprintf(buf, "%u\n", host_control_action); | |
200 | } | |
201 | ||
202 | static ssize_t host_control_action_store(struct device *dev, | |
203 | struct device_attribute *attr, | |
204 | const char *buf, size_t count) | |
205 | { | |
206 | ssize_t ret; | |
207 | ||
208 | /* make sure buffer is available for host control command */ | |
8ed965d6 | 209 | mutex_lock(&smi_data_lock); |
90563ec4 | 210 | ret = smi_data_buf_realloc(sizeof(struct apm_cmd)); |
8ed965d6 | 211 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
212 | if (ret) |
213 | return ret; | |
214 | ||
215 | host_control_action = simple_strtoul(buf, NULL, 10); | |
216 | return count; | |
217 | } | |
218 | ||
219 | static ssize_t host_control_smi_type_show(struct device *dev, | |
220 | struct device_attribute *attr, | |
221 | char *buf) | |
222 | { | |
223 | return sprintf(buf, "%u\n", host_control_smi_type); | |
224 | } | |
225 | ||
226 | static ssize_t host_control_smi_type_store(struct device *dev, | |
227 | struct device_attribute *attr, | |
228 | const char *buf, size_t count) | |
229 | { | |
230 | host_control_smi_type = simple_strtoul(buf, NULL, 10); | |
231 | return count; | |
232 | } | |
233 | ||
234 | static ssize_t host_control_on_shutdown_show(struct device *dev, | |
235 | struct device_attribute *attr, | |
236 | char *buf) | |
237 | { | |
238 | return sprintf(buf, "%u\n", host_control_on_shutdown); | |
239 | } | |
240 | ||
241 | static ssize_t host_control_on_shutdown_store(struct device *dev, | |
242 | struct device_attribute *attr, | |
243 | const char *buf, size_t count) | |
244 | { | |
245 | host_control_on_shutdown = simple_strtoul(buf, NULL, 10); | |
246 | return count; | |
247 | } | |
248 | ||
249 | /** | |
250 | * smi_request: generate SMI request | |
251 | * | |
252 | * Called with smi_data_lock. | |
253 | */ | |
254 | static int smi_request(struct smi_cmd *smi_cmd) | |
255 | { | |
256 | cpumask_t old_mask; | |
257 | int ret = 0; | |
258 | ||
259 | if (smi_cmd->magic != SMI_CMD_MAGIC) { | |
260 | dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n", | |
261 | __FUNCTION__); | |
262 | return -EBADR; | |
263 | } | |
264 | ||
265 | /* SMI requires CPU 0 */ | |
266 | old_mask = current->cpus_allowed; | |
f70316da | 267 | set_cpus_allowed_ptr(current, &cpumask_of_cpu(0)); |
90563ec4 DW |
268 | if (smp_processor_id() != 0) { |
269 | dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n", | |
270 | __FUNCTION__); | |
271 | ret = -EBUSY; | |
272 | goto out; | |
273 | } | |
274 | ||
275 | /* generate SMI */ | |
276 | asm volatile ( | |
277 | "outb %b0,%w1" | |
278 | : /* no output args */ | |
279 | : "a" (smi_cmd->command_code), | |
280 | "d" (smi_cmd->command_address), | |
281 | "b" (smi_cmd->ebx), | |
282 | "c" (smi_cmd->ecx) | |
283 | : "memory" | |
284 | ); | |
285 | ||
286 | out: | |
f70316da | 287 | set_cpus_allowed_ptr(current, &old_mask); |
90563ec4 DW |
288 | return ret; |
289 | } | |
290 | ||
291 | /** | |
292 | * smi_request_store: | |
293 | * | |
294 | * The valid values are: | |
295 | * 0: zero SMI data buffer | |
296 | * 1: generate calling interface SMI | |
297 | * 2: generate raw SMI | |
298 | * | |
299 | * User application writes smi_cmd to smi_data before telling driver | |
300 | * to generate SMI. | |
301 | */ | |
302 | static ssize_t smi_request_store(struct device *dev, | |
303 | struct device_attribute *attr, | |
304 | const char *buf, size_t count) | |
305 | { | |
306 | struct smi_cmd *smi_cmd; | |
307 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
308 | ssize_t ret; | |
309 | ||
8ed965d6 | 310 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
311 | |
312 | if (smi_data_buf_size < sizeof(struct smi_cmd)) { | |
313 | ret = -ENODEV; | |
314 | goto out; | |
315 | } | |
316 | smi_cmd = (struct smi_cmd *)smi_data_buf; | |
317 | ||
318 | switch (val) { | |
319 | case 2: | |
320 | /* Raw SMI */ | |
321 | ret = smi_request(smi_cmd); | |
322 | if (!ret) | |
323 | ret = count; | |
324 | break; | |
325 | case 1: | |
326 | /* Calling Interface SMI */ | |
327 | smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer); | |
328 | ret = smi_request(smi_cmd); | |
329 | if (!ret) | |
330 | ret = count; | |
331 | break; | |
332 | case 0: | |
333 | memset(smi_data_buf, 0, smi_data_buf_size); | |
334 | ret = count; | |
335 | break; | |
336 | default: | |
337 | ret = -EINVAL; | |
338 | break; | |
339 | } | |
340 | ||
341 | out: | |
8ed965d6 | 342 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
343 | return ret; |
344 | } | |
345 | ||
346 | /** | |
347 | * host_control_smi: generate host control SMI | |
348 | * | |
349 | * Caller must set up the host control command in smi_data_buf. | |
350 | */ | |
351 | static int host_control_smi(void) | |
352 | { | |
353 | struct apm_cmd *apm_cmd; | |
354 | u8 *data; | |
355 | unsigned long flags; | |
356 | u32 num_ticks; | |
357 | s8 cmd_status; | |
358 | u8 index; | |
359 | ||
360 | apm_cmd = (struct apm_cmd *)smi_data_buf; | |
361 | apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL; | |
362 | ||
363 | switch (host_control_smi_type) { | |
364 | case HC_SMITYPE_TYPE1: | |
365 | spin_lock_irqsave(&rtc_lock, flags); | |
366 | /* write SMI data buffer physical address */ | |
367 | data = (u8 *)&smi_data_buf_phys_addr; | |
368 | for (index = PE1300_CMOS_CMD_STRUCT_PTR; | |
369 | index < (PE1300_CMOS_CMD_STRUCT_PTR + 4); | |
370 | index++, data++) { | |
371 | outb(index, | |
372 | (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4)); | |
373 | outb(*data, | |
374 | (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4)); | |
375 | } | |
376 | ||
377 | /* first set status to -1 as called by spec */ | |
378 | cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL; | |
379 | outb((u8) cmd_status, PCAT_APM_STATUS_PORT); | |
380 | ||
381 | /* generate SMM call */ | |
382 | outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT); | |
383 | spin_unlock_irqrestore(&rtc_lock, flags); | |
384 | ||
385 | /* wait a few to see if it executed */ | |
386 | num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING; | |
387 | while ((cmd_status = inb(PCAT_APM_STATUS_PORT)) | |
388 | == ESM_STATUS_CMD_UNSUCCESSFUL) { | |
389 | num_ticks--; | |
390 | if (num_ticks == EXPIRED_TIMER) | |
391 | return -ETIME; | |
392 | } | |
393 | break; | |
394 | ||
395 | case HC_SMITYPE_TYPE2: | |
396 | case HC_SMITYPE_TYPE3: | |
397 | spin_lock_irqsave(&rtc_lock, flags); | |
398 | /* write SMI data buffer physical address */ | |
399 | data = (u8 *)&smi_data_buf_phys_addr; | |
400 | for (index = PE1400_CMOS_CMD_STRUCT_PTR; | |
401 | index < (PE1400_CMOS_CMD_STRUCT_PTR + 4); | |
402 | index++, data++) { | |
403 | outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT)); | |
404 | outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT)); | |
405 | } | |
406 | ||
407 | /* generate SMM call */ | |
408 | if (host_control_smi_type == HC_SMITYPE_TYPE3) | |
409 | outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT); | |
410 | else | |
411 | outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT); | |
412 | ||
413 | /* restore RTC index pointer since it was written to above */ | |
414 | CMOS_READ(RTC_REG_C); | |
415 | spin_unlock_irqrestore(&rtc_lock, flags); | |
416 | ||
417 | /* read control port back to serialize write */ | |
418 | cmd_status = inb(PE1400_APM_CONTROL_PORT); | |
419 | ||
420 | /* wait a few to see if it executed */ | |
421 | num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING; | |
422 | while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) { | |
423 | num_ticks--; | |
424 | if (num_ticks == EXPIRED_TIMER) | |
425 | return -ETIME; | |
426 | } | |
427 | break; | |
428 | ||
429 | default: | |
430 | dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n", | |
431 | __FUNCTION__, host_control_smi_type); | |
432 | return -ENOSYS; | |
433 | } | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | /** | |
439 | * dcdbas_host_control: initiate host control | |
440 | * | |
441 | * This function is called by the driver after the system has | |
442 | * finished shutting down if the user application specified a | |
443 | * host control action to perform on shutdown. It is safe to | |
444 | * use smi_data_buf at this point because the system has finished | |
445 | * shutting down and no userspace apps are running. | |
446 | */ | |
447 | static void dcdbas_host_control(void) | |
448 | { | |
449 | struct apm_cmd *apm_cmd; | |
450 | u8 action; | |
451 | ||
452 | if (host_control_action == HC_ACTION_NONE) | |
453 | return; | |
454 | ||
455 | action = host_control_action; | |
456 | host_control_action = HC_ACTION_NONE; | |
457 | ||
458 | if (!smi_data_buf) { | |
459 | dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __FUNCTION__); | |
460 | return; | |
461 | } | |
462 | ||
463 | if (smi_data_buf_size < sizeof(struct apm_cmd)) { | |
464 | dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n", | |
465 | __FUNCTION__); | |
466 | return; | |
467 | } | |
468 | ||
469 | apm_cmd = (struct apm_cmd *)smi_data_buf; | |
470 | ||
471 | /* power off takes precedence */ | |
472 | if (action & HC_ACTION_HOST_CONTROL_POWEROFF) { | |
473 | apm_cmd->command = ESM_APM_POWER_CYCLE; | |
474 | apm_cmd->reserved = 0; | |
475 | *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0; | |
476 | host_control_smi(); | |
477 | } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) { | |
478 | apm_cmd->command = ESM_APM_POWER_CYCLE; | |
479 | apm_cmd->reserved = 0; | |
480 | *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20; | |
481 | host_control_smi(); | |
482 | } | |
483 | } | |
484 | ||
485 | /** | |
486 | * dcdbas_reboot_notify: handle reboot notification for host control | |
487 | */ | |
488 | static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code, | |
489 | void *unused) | |
490 | { | |
90563ec4 DW |
491 | switch (code) { |
492 | case SYS_DOWN: | |
493 | case SYS_HALT: | |
494 | case SYS_POWER_OFF: | |
495 | if (host_control_on_shutdown) { | |
496 | /* firmware is going to perform host control action */ | |
e041c683 AS |
497 | printk(KERN_WARNING "Please wait for shutdown " |
498 | "action to complete...\n"); | |
499 | dcdbas_host_control(); | |
90563ec4 DW |
500 | } |
501 | break; | |
502 | } | |
503 | ||
504 | return NOTIFY_DONE; | |
505 | } | |
506 | ||
507 | static struct notifier_block dcdbas_reboot_nb = { | |
508 | .notifier_call = dcdbas_reboot_notify, | |
509 | .next = NULL, | |
e041c683 | 510 | .priority = INT_MIN |
90563ec4 DW |
511 | }; |
512 | ||
513 | static DCDBAS_BIN_ATTR_RW(smi_data); | |
514 | ||
515 | static struct bin_attribute *dcdbas_bin_attrs[] = { | |
516 | &bin_attr_smi_data, | |
517 | NULL | |
518 | }; | |
519 | ||
520 | static DCDBAS_DEV_ATTR_RW(smi_data_buf_size); | |
521 | static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr); | |
522 | static DCDBAS_DEV_ATTR_WO(smi_request); | |
523 | static DCDBAS_DEV_ATTR_RW(host_control_action); | |
524 | static DCDBAS_DEV_ATTR_RW(host_control_smi_type); | |
525 | static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown); | |
526 | ||
a7f3ea72 DT |
527 | static struct attribute *dcdbas_dev_attrs[] = { |
528 | &dev_attr_smi_data_buf_size.attr, | |
529 | &dev_attr_smi_data_buf_phys_addr.attr, | |
530 | &dev_attr_smi_request.attr, | |
531 | &dev_attr_host_control_action.attr, | |
532 | &dev_attr_host_control_smi_type.attr, | |
533 | &dev_attr_host_control_on_shutdown.attr, | |
90563ec4 DW |
534 | NULL |
535 | }; | |
536 | ||
a7f3ea72 DT |
537 | static struct attribute_group dcdbas_attr_group = { |
538 | .attrs = dcdbas_dev_attrs, | |
539 | }; | |
540 | ||
541 | static int __devinit dcdbas_probe(struct platform_device *dev) | |
90563ec4 | 542 | { |
a7f3ea72 | 543 | int i, error; |
90563ec4 DW |
544 | |
545 | host_control_action = HC_ACTION_NONE; | |
546 | host_control_smi_type = HC_SMITYPE_NONE; | |
547 | ||
90563ec4 DW |
548 | /* |
549 | * BIOS SMI calls require buffer addresses be in 32-bit address space. | |
550 | * This is done by setting the DMA mask below. | |
551 | */ | |
552 | dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK; | |
553 | dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask; | |
554 | ||
a7f3ea72 DT |
555 | error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group); |
556 | if (error) | |
557 | return error; | |
558 | ||
559 | for (i = 0; dcdbas_bin_attrs[i]; i++) { | |
560 | error = sysfs_create_bin_file(&dev->dev.kobj, | |
561 | dcdbas_bin_attrs[i]); | |
562 | if (error) { | |
563 | while (--i >= 0) | |
564 | sysfs_remove_bin_file(&dev->dev.kobj, | |
565 | dcdbas_bin_attrs[i]); | |
0968cf51 | 566 | sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group); |
a7f3ea72 DT |
567 | return error; |
568 | } | |
569 | } | |
570 | ||
90563ec4 DW |
571 | register_reboot_notifier(&dcdbas_reboot_nb); |
572 | ||
a7f3ea72 DT |
573 | dev_info(&dev->dev, "%s (version %s)\n", |
574 | DRIVER_DESCRIPTION, DRIVER_VERSION); | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | static int __devexit dcdbas_remove(struct platform_device *dev) | |
580 | { | |
581 | int i; | |
582 | ||
583 | unregister_reboot_notifier(&dcdbas_reboot_nb); | |
90563ec4 | 584 | for (i = 0; dcdbas_bin_attrs[i]; i++) |
a7f3ea72 DT |
585 | sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]); |
586 | sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group); | |
90563ec4 | 587 | |
a7f3ea72 DT |
588 | return 0; |
589 | } | |
90563ec4 | 590 | |
a7f3ea72 DT |
591 | static struct platform_driver dcdbas_driver = { |
592 | .driver = { | |
593 | .name = DRIVER_NAME, | |
594 | .owner = THIS_MODULE, | |
595 | }, | |
596 | .probe = dcdbas_probe, | |
597 | .remove = __devexit_p(dcdbas_remove), | |
598 | }; | |
599 | ||
600 | /** | |
601 | * dcdbas_init: initialize driver | |
602 | */ | |
603 | static int __init dcdbas_init(void) | |
604 | { | |
605 | int error; | |
606 | ||
607 | error = platform_driver_register(&dcdbas_driver); | |
608 | if (error) | |
609 | return error; | |
610 | ||
611 | dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1); | |
612 | if (!dcdbas_pdev) { | |
613 | error = -ENOMEM; | |
614 | goto err_unregister_driver; | |
615 | } | |
616 | ||
617 | error = platform_device_add(dcdbas_pdev); | |
618 | if (error) | |
619 | goto err_free_device; | |
90563ec4 DW |
620 | |
621 | return 0; | |
a7f3ea72 DT |
622 | |
623 | err_free_device: | |
624 | platform_device_put(dcdbas_pdev); | |
625 | err_unregister_driver: | |
626 | platform_driver_unregister(&dcdbas_driver); | |
627 | return error; | |
90563ec4 DW |
628 | } |
629 | ||
630 | /** | |
631 | * dcdbas_exit: perform driver cleanup | |
632 | */ | |
633 | static void __exit dcdbas_exit(void) | |
634 | { | |
435a80f6 DW |
635 | /* |
636 | * make sure functions that use dcdbas_pdev are called | |
637 | * before platform_device_unregister | |
638 | */ | |
90563ec4 DW |
639 | unregister_reboot_notifier(&dcdbas_reboot_nb); |
640 | smi_data_buf_free(); | |
435a80f6 | 641 | platform_device_unregister(dcdbas_pdev); |
a7f3ea72 DT |
642 | platform_driver_unregister(&dcdbas_driver); |
643 | ||
644 | /* | |
645 | * We have to free the buffer here instead of dcdbas_remove | |
646 | * because only in module exit function we can be sure that | |
647 | * all sysfs attributes belonging to this module have been | |
648 | * released. | |
649 | */ | |
650 | smi_data_buf_free(); | |
90563ec4 DW |
651 | } |
652 | ||
653 | module_init(dcdbas_init); | |
654 | module_exit(dcdbas_exit); | |
655 | ||
656 | MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")"); | |
657 | MODULE_VERSION(DRIVER_VERSION); | |
658 | MODULE_AUTHOR("Dell Inc."); | |
659 | MODULE_LICENSE("GPL"); | |
8f47f0b6 MD |
660 | /* Any System or BIOS claiming to be by Dell */ |
661 | MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*"); |