Commit | Line | Data |
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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", | |
eecd5853 | 66 | __func__, smi_data_buf_phys_addr, smi_data_buf_size); |
90563ec4 DW |
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", | |
eecd5853 | 95 | __func__, size); |
90563ec4 DW |
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", | |
eecd5853 | 113 | __func__, smi_data_buf_phys_addr, smi_data_buf_size); |
90563ec4 DW |
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 | 154 | { |
90563ec4 DW |
155 | ssize_t ret; |
156 | ||
8ed965d6 | 157 | mutex_lock(&smi_data_lock); |
abe19b7b AM |
158 | ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf, |
159 | smi_data_buf_size); | |
8ed965d6 | 160 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
161 | return ret; |
162 | } | |
163 | ||
91a69029 ZR |
164 | static ssize_t smi_data_write(struct kobject *kobj, |
165 | struct bin_attribute *bin_attr, | |
166 | char *buf, loff_t pos, size_t count) | |
90563ec4 DW |
167 | { |
168 | ssize_t ret; | |
169 | ||
b95936cb DW |
170 | if ((pos + count) > MAX_SMI_DATA_BUF_SIZE) |
171 | return -EINVAL; | |
172 | ||
8ed965d6 | 173 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
174 | |
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; | |
181 | out: | |
8ed965d6 | 182 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
183 | return ret; |
184 | } | |
185 | ||
186 | static 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 | ||
193 | static 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 */ | |
8ed965d6 | 200 | mutex_lock(&smi_data_lock); |
90563ec4 | 201 | ret = smi_data_buf_realloc(sizeof(struct apm_cmd)); |
8ed965d6 | 202 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
203 | if (ret) |
204 | return ret; | |
205 | ||
206 | host_control_action = simple_strtoul(buf, NULL, 10); | |
207 | return count; | |
208 | } | |
209 | ||
210 | static 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 | ||
217 | static 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 | ||
225 | static 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 | ||
232 | static 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 | */ | |
245 | static 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", | |
eecd5853 | 252 | __func__); |
90563ec4 DW |
253 | return -EBADR; |
254 | } | |
255 | ||
256 | /* SMI requires CPU 0 */ | |
257 | old_mask = current->cpus_allowed; | |
0bc3cc03 | 258 | set_cpus_allowed_ptr(current, &cpumask_of_cpu(0)); |
90563ec4 DW |
259 | if (smp_processor_id() != 0) { |
260 | dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n", | |
eecd5853 | 261 | __func__); |
90563ec4 DW |
262 | 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 | ||
277 | out: | |
f70316da | 278 | set_cpus_allowed_ptr(current, &old_mask); |
90563ec4 DW |
279 | 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 | */ | |
293 | static 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 | ||
8ed965d6 | 301 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
302 | |
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 | ||
332 | out: | |
8ed965d6 | 333 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
334 | 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 | */ | |
342 | static 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", | |
eecd5853 | 422 | __func__, host_control_smi_type); |
90563ec4 DW |
423 | 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 | */ | |
438 | static 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) { | |
eecd5853 | 450 | dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __func__); |
90563ec4 DW |
451 | 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", | |
eecd5853 | 456 | __func__); |
90563ec4 DW |
457 | 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 | */ | |
479 | static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code, | |
480 | void *unused) | |
481 | { | |
90563ec4 DW |
482 | 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 */ | |
e041c683 AS |
488 | printk(KERN_WARNING "Please wait for shutdown " |
489 | "action to complete...\n"); | |
490 | dcdbas_host_control(); | |
90563ec4 DW |
491 | } |
492 | break; | |
493 | } | |
494 | ||
495 | return NOTIFY_DONE; | |
496 | } | |
497 | ||
498 | static struct notifier_block dcdbas_reboot_nb = { | |
499 | .notifier_call = dcdbas_reboot_notify, | |
500 | .next = NULL, | |
e041c683 | 501 | .priority = INT_MIN |
90563ec4 DW |
502 | }; |
503 | ||
504 | static DCDBAS_BIN_ATTR_RW(smi_data); | |
505 | ||
506 | static struct bin_attribute *dcdbas_bin_attrs[] = { | |
507 | &bin_attr_smi_data, | |
508 | NULL | |
509 | }; | |
510 | ||
511 | static DCDBAS_DEV_ATTR_RW(smi_data_buf_size); | |
512 | static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr); | |
513 | static DCDBAS_DEV_ATTR_WO(smi_request); | |
514 | static DCDBAS_DEV_ATTR_RW(host_control_action); | |
515 | static DCDBAS_DEV_ATTR_RW(host_control_smi_type); | |
516 | static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown); | |
517 | ||
a7f3ea72 DT |
518 | static 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, | |
90563ec4 DW |
525 | NULL |
526 | }; | |
527 | ||
a7f3ea72 DT |
528 | static struct attribute_group dcdbas_attr_group = { |
529 | .attrs = dcdbas_dev_attrs, | |
530 | }; | |
531 | ||
532 | static int __devinit dcdbas_probe(struct platform_device *dev) | |
90563ec4 | 533 | { |
a7f3ea72 | 534 | int i, error; |
90563ec4 DW |
535 | |
536 | host_control_action = HC_ACTION_NONE; | |
537 | host_control_smi_type = HC_SMITYPE_NONE; | |
538 | ||
90563ec4 DW |
539 | /* |
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 | ||
a7f3ea72 DT |
546 | 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]); | |
0968cf51 | 557 | sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group); |
a7f3ea72 DT |
558 | return error; |
559 | } | |
560 | } | |
561 | ||
90563ec4 DW |
562 | register_reboot_notifier(&dcdbas_reboot_nb); |
563 | ||
a7f3ea72 DT |
564 | dev_info(&dev->dev, "%s (version %s)\n", |
565 | DRIVER_DESCRIPTION, DRIVER_VERSION); | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | static int __devexit dcdbas_remove(struct platform_device *dev) | |
571 | { | |
572 | int i; | |
573 | ||
574 | unregister_reboot_notifier(&dcdbas_reboot_nb); | |
90563ec4 | 575 | for (i = 0; dcdbas_bin_attrs[i]; i++) |
a7f3ea72 DT |
576 | sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]); |
577 | sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group); | |
90563ec4 | 578 | |
a7f3ea72 DT |
579 | return 0; |
580 | } | |
90563ec4 | 581 | |
a7f3ea72 DT |
582 | static 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 | */ | |
594 | static 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; | |
90563ec4 DW |
611 | |
612 | return 0; | |
a7f3ea72 DT |
613 | |
614 | err_free_device: | |
615 | platform_device_put(dcdbas_pdev); | |
616 | err_unregister_driver: | |
617 | platform_driver_unregister(&dcdbas_driver); | |
618 | return error; | |
90563ec4 DW |
619 | } |
620 | ||
621 | /** | |
622 | * dcdbas_exit: perform driver cleanup | |
623 | */ | |
624 | static void __exit dcdbas_exit(void) | |
625 | { | |
435a80f6 DW |
626 | /* |
627 | * make sure functions that use dcdbas_pdev are called | |
628 | * before platform_device_unregister | |
629 | */ | |
90563ec4 DW |
630 | unregister_reboot_notifier(&dcdbas_reboot_nb); |
631 | smi_data_buf_free(); | |
435a80f6 | 632 | platform_device_unregister(dcdbas_pdev); |
a7f3ea72 DT |
633 | 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(); | |
90563ec4 DW |
642 | } |
643 | ||
644 | module_init(dcdbas_init); | |
645 | module_exit(dcdbas_exit); | |
646 | ||
647 | MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")"); | |
648 | MODULE_VERSION(DRIVER_VERSION); | |
649 | MODULE_AUTHOR("Dell Inc."); | |
650 | MODULE_LICENSE("GPL"); | |
8f47f0b6 MD |
651 | /* Any System or BIOS claiming to be by Dell */ |
652 | MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*"); |