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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 DW |
37 | #include <asm/io.h> |
38 | #include <asm/semaphore.h> | |
39 | ||
40 | #include "dcdbas.h" | |
41 | ||
42 | #define DRIVER_NAME "dcdbas" | |
b95936cb | 43 | #define DRIVER_VERSION "5.6.0-3.2" |
90563ec4 DW |
44 | #define DRIVER_DESCRIPTION "Dell Systems Management Base Driver" |
45 | ||
46 | static struct platform_device *dcdbas_pdev; | |
47 | ||
48 | static u8 *smi_data_buf; | |
49 | static dma_addr_t smi_data_buf_handle; | |
50 | static unsigned long smi_data_buf_size; | |
51 | static u32 smi_data_buf_phys_addr; | |
8ed965d6 | 52 | static DEFINE_MUTEX(smi_data_lock); |
90563ec4 DW |
53 | |
54 | static unsigned int host_control_action; | |
55 | static unsigned int host_control_smi_type; | |
56 | static unsigned int host_control_on_shutdown; | |
57 | ||
58 | /** | |
59 | * smi_data_buf_free: free SMI data buffer | |
60 | */ | |
61 | static 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", | |
67 | __FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size); | |
68 | ||
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 | */ | |
80 | static 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", | |
96 | __FUNCTION__, size); | |
97 | 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", | |
114 | __FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size); | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | static 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 | ||
126 | static 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 | ||
133 | static 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 */ | |
8ed965d6 | 143 | mutex_lock(&smi_data_lock); |
90563ec4 | 144 | ret = smi_data_buf_realloc(buf_size); |
8ed965d6 | 145 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
146 | if (ret) |
147 | return ret; | |
148 | ||
149 | return count; | |
150 | } | |
151 | ||
91a69029 ZR |
152 | static ssize_t smi_data_read(struct kobject *kobj, |
153 | struct bin_attribute *bin_attr, | |
154 | char *buf, loff_t pos, size_t count) | |
90563ec4 DW |
155 | { |
156 | size_t max_read; | |
157 | ssize_t ret; | |
158 | ||
8ed965d6 | 159 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
160 | |
161 | if (pos >= smi_data_buf_size) { | |
162 | ret = 0; | |
163 | goto out; | |
164 | } | |
165 | ||
166 | max_read = smi_data_buf_size - pos; | |
167 | ret = min(max_read, count); | |
168 | memcpy(buf, smi_data_buf + pos, ret); | |
169 | out: | |
8ed965d6 | 170 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
171 | return ret; |
172 | } | |
173 | ||
91a69029 ZR |
174 | static ssize_t smi_data_write(struct kobject *kobj, |
175 | struct bin_attribute *bin_attr, | |
176 | char *buf, loff_t pos, size_t count) | |
90563ec4 DW |
177 | { |
178 | ssize_t ret; | |
179 | ||
b95936cb DW |
180 | if ((pos + count) > MAX_SMI_DATA_BUF_SIZE) |
181 | return -EINVAL; | |
182 | ||
8ed965d6 | 183 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
184 | |
185 | ret = smi_data_buf_realloc(pos + count); | |
186 | if (ret) | |
187 | goto out; | |
188 | ||
189 | memcpy(smi_data_buf + pos, buf, count); | |
190 | ret = count; | |
191 | out: | |
8ed965d6 | 192 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
193 | return ret; |
194 | } | |
195 | ||
196 | static ssize_t host_control_action_show(struct device *dev, | |
197 | struct device_attribute *attr, | |
198 | char *buf) | |
199 | { | |
200 | return sprintf(buf, "%u\n", host_control_action); | |
201 | } | |
202 | ||
203 | static ssize_t host_control_action_store(struct device *dev, | |
204 | struct device_attribute *attr, | |
205 | const char *buf, size_t count) | |
206 | { | |
207 | ssize_t ret; | |
208 | ||
209 | /* make sure buffer is available for host control command */ | |
8ed965d6 | 210 | mutex_lock(&smi_data_lock); |
90563ec4 | 211 | ret = smi_data_buf_realloc(sizeof(struct apm_cmd)); |
8ed965d6 | 212 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
213 | if (ret) |
214 | return ret; | |
215 | ||
216 | host_control_action = simple_strtoul(buf, NULL, 10); | |
217 | return count; | |
218 | } | |
219 | ||
220 | static ssize_t host_control_smi_type_show(struct device *dev, | |
221 | struct device_attribute *attr, | |
222 | char *buf) | |
223 | { | |
224 | return sprintf(buf, "%u\n", host_control_smi_type); | |
225 | } | |
226 | ||
227 | static ssize_t host_control_smi_type_store(struct device *dev, | |
228 | struct device_attribute *attr, | |
229 | const char *buf, size_t count) | |
230 | { | |
231 | host_control_smi_type = simple_strtoul(buf, NULL, 10); | |
232 | return count; | |
233 | } | |
234 | ||
235 | static ssize_t host_control_on_shutdown_show(struct device *dev, | |
236 | struct device_attribute *attr, | |
237 | char *buf) | |
238 | { | |
239 | return sprintf(buf, "%u\n", host_control_on_shutdown); | |
240 | } | |
241 | ||
242 | static ssize_t host_control_on_shutdown_store(struct device *dev, | |
243 | struct device_attribute *attr, | |
244 | const char *buf, size_t count) | |
245 | { | |
246 | host_control_on_shutdown = simple_strtoul(buf, NULL, 10); | |
247 | return count; | |
248 | } | |
249 | ||
250 | /** | |
251 | * smi_request: generate SMI request | |
252 | * | |
253 | * Called with smi_data_lock. | |
254 | */ | |
255 | static int smi_request(struct smi_cmd *smi_cmd) | |
256 | { | |
257 | cpumask_t old_mask; | |
258 | int ret = 0; | |
259 | ||
260 | if (smi_cmd->magic != SMI_CMD_MAGIC) { | |
261 | dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n", | |
262 | __FUNCTION__); | |
263 | return -EBADR; | |
264 | } | |
265 | ||
266 | /* SMI requires CPU 0 */ | |
267 | old_mask = current->cpus_allowed; | |
268 | set_cpus_allowed(current, cpumask_of_cpu(0)); | |
269 | if (smp_processor_id() != 0) { | |
270 | dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n", | |
271 | __FUNCTION__); | |
272 | ret = -EBUSY; | |
273 | goto out; | |
274 | } | |
275 | ||
276 | /* generate SMI */ | |
277 | asm volatile ( | |
278 | "outb %b0,%w1" | |
279 | : /* no output args */ | |
280 | : "a" (smi_cmd->command_code), | |
281 | "d" (smi_cmd->command_address), | |
282 | "b" (smi_cmd->ebx), | |
283 | "c" (smi_cmd->ecx) | |
284 | : "memory" | |
285 | ); | |
286 | ||
287 | out: | |
288 | set_cpus_allowed(current, old_mask); | |
289 | return ret; | |
290 | } | |
291 | ||
292 | /** | |
293 | * smi_request_store: | |
294 | * | |
295 | * The valid values are: | |
296 | * 0: zero SMI data buffer | |
297 | * 1: generate calling interface SMI | |
298 | * 2: generate raw SMI | |
299 | * | |
300 | * User application writes smi_cmd to smi_data before telling driver | |
301 | * to generate SMI. | |
302 | */ | |
303 | static ssize_t smi_request_store(struct device *dev, | |
304 | struct device_attribute *attr, | |
305 | const char *buf, size_t count) | |
306 | { | |
307 | struct smi_cmd *smi_cmd; | |
308 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
309 | ssize_t ret; | |
310 | ||
8ed965d6 | 311 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
312 | |
313 | if (smi_data_buf_size < sizeof(struct smi_cmd)) { | |
314 | ret = -ENODEV; | |
315 | goto out; | |
316 | } | |
317 | smi_cmd = (struct smi_cmd *)smi_data_buf; | |
318 | ||
319 | switch (val) { | |
320 | case 2: | |
321 | /* Raw SMI */ | |
322 | ret = smi_request(smi_cmd); | |
323 | if (!ret) | |
324 | ret = count; | |
325 | break; | |
326 | case 1: | |
327 | /* Calling Interface SMI */ | |
328 | smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer); | |
329 | ret = smi_request(smi_cmd); | |
330 | if (!ret) | |
331 | ret = count; | |
332 | break; | |
333 | case 0: | |
334 | memset(smi_data_buf, 0, smi_data_buf_size); | |
335 | ret = count; | |
336 | break; | |
337 | default: | |
338 | ret = -EINVAL; | |
339 | break; | |
340 | } | |
341 | ||
342 | out: | |
8ed965d6 | 343 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
344 | return ret; |
345 | } | |
346 | ||
347 | /** | |
348 | * host_control_smi: generate host control SMI | |
349 | * | |
350 | * Caller must set up the host control command in smi_data_buf. | |
351 | */ | |
352 | static int host_control_smi(void) | |
353 | { | |
354 | struct apm_cmd *apm_cmd; | |
355 | u8 *data; | |
356 | unsigned long flags; | |
357 | u32 num_ticks; | |
358 | s8 cmd_status; | |
359 | u8 index; | |
360 | ||
361 | apm_cmd = (struct apm_cmd *)smi_data_buf; | |
362 | apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL; | |
363 | ||
364 | switch (host_control_smi_type) { | |
365 | case HC_SMITYPE_TYPE1: | |
366 | spin_lock_irqsave(&rtc_lock, flags); | |
367 | /* write SMI data buffer physical address */ | |
368 | data = (u8 *)&smi_data_buf_phys_addr; | |
369 | for (index = PE1300_CMOS_CMD_STRUCT_PTR; | |
370 | index < (PE1300_CMOS_CMD_STRUCT_PTR + 4); | |
371 | index++, data++) { | |
372 | outb(index, | |
373 | (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4)); | |
374 | outb(*data, | |
375 | (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4)); | |
376 | } | |
377 | ||
378 | /* first set status to -1 as called by spec */ | |
379 | cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL; | |
380 | outb((u8) cmd_status, PCAT_APM_STATUS_PORT); | |
381 | ||
382 | /* generate SMM call */ | |
383 | outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT); | |
384 | spin_unlock_irqrestore(&rtc_lock, flags); | |
385 | ||
386 | /* wait a few to see if it executed */ | |
387 | num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING; | |
388 | while ((cmd_status = inb(PCAT_APM_STATUS_PORT)) | |
389 | == ESM_STATUS_CMD_UNSUCCESSFUL) { | |
390 | num_ticks--; | |
391 | if (num_ticks == EXPIRED_TIMER) | |
392 | return -ETIME; | |
393 | } | |
394 | break; | |
395 | ||
396 | case HC_SMITYPE_TYPE2: | |
397 | case HC_SMITYPE_TYPE3: | |
398 | spin_lock_irqsave(&rtc_lock, flags); | |
399 | /* write SMI data buffer physical address */ | |
400 | data = (u8 *)&smi_data_buf_phys_addr; | |
401 | for (index = PE1400_CMOS_CMD_STRUCT_PTR; | |
402 | index < (PE1400_CMOS_CMD_STRUCT_PTR + 4); | |
403 | index++, data++) { | |
404 | outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT)); | |
405 | outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT)); | |
406 | } | |
407 | ||
408 | /* generate SMM call */ | |
409 | if (host_control_smi_type == HC_SMITYPE_TYPE3) | |
410 | outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT); | |
411 | else | |
412 | outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT); | |
413 | ||
414 | /* restore RTC index pointer since it was written to above */ | |
415 | CMOS_READ(RTC_REG_C); | |
416 | spin_unlock_irqrestore(&rtc_lock, flags); | |
417 | ||
418 | /* read control port back to serialize write */ | |
419 | cmd_status = inb(PE1400_APM_CONTROL_PORT); | |
420 | ||
421 | /* wait a few to see if it executed */ | |
422 | num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING; | |
423 | while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) { | |
424 | num_ticks--; | |
425 | if (num_ticks == EXPIRED_TIMER) | |
426 | return -ETIME; | |
427 | } | |
428 | break; | |
429 | ||
430 | default: | |
431 | dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n", | |
432 | __FUNCTION__, host_control_smi_type); | |
433 | return -ENOSYS; | |
434 | } | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | /** | |
440 | * dcdbas_host_control: initiate host control | |
441 | * | |
442 | * This function is called by the driver after the system has | |
443 | * finished shutting down if the user application specified a | |
444 | * host control action to perform on shutdown. It is safe to | |
445 | * use smi_data_buf at this point because the system has finished | |
446 | * shutting down and no userspace apps are running. | |
447 | */ | |
448 | static void dcdbas_host_control(void) | |
449 | { | |
450 | struct apm_cmd *apm_cmd; | |
451 | u8 action; | |
452 | ||
453 | if (host_control_action == HC_ACTION_NONE) | |
454 | return; | |
455 | ||
456 | action = host_control_action; | |
457 | host_control_action = HC_ACTION_NONE; | |
458 | ||
459 | if (!smi_data_buf) { | |
460 | dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __FUNCTION__); | |
461 | return; | |
462 | } | |
463 | ||
464 | if (smi_data_buf_size < sizeof(struct apm_cmd)) { | |
465 | dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n", | |
466 | __FUNCTION__); | |
467 | return; | |
468 | } | |
469 | ||
470 | apm_cmd = (struct apm_cmd *)smi_data_buf; | |
471 | ||
472 | /* power off takes precedence */ | |
473 | if (action & HC_ACTION_HOST_CONTROL_POWEROFF) { | |
474 | apm_cmd->command = ESM_APM_POWER_CYCLE; | |
475 | apm_cmd->reserved = 0; | |
476 | *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0; | |
477 | host_control_smi(); | |
478 | } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) { | |
479 | apm_cmd->command = ESM_APM_POWER_CYCLE; | |
480 | apm_cmd->reserved = 0; | |
481 | *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20; | |
482 | host_control_smi(); | |
483 | } | |
484 | } | |
485 | ||
486 | /** | |
487 | * dcdbas_reboot_notify: handle reboot notification for host control | |
488 | */ | |
489 | static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code, | |
490 | void *unused) | |
491 | { | |
90563ec4 DW |
492 | switch (code) { |
493 | case SYS_DOWN: | |
494 | case SYS_HALT: | |
495 | case SYS_POWER_OFF: | |
496 | if (host_control_on_shutdown) { | |
497 | /* firmware is going to perform host control action */ | |
e041c683 AS |
498 | printk(KERN_WARNING "Please wait for shutdown " |
499 | "action to complete...\n"); | |
500 | dcdbas_host_control(); | |
90563ec4 DW |
501 | } |
502 | break; | |
503 | } | |
504 | ||
505 | return NOTIFY_DONE; | |
506 | } | |
507 | ||
508 | static struct notifier_block dcdbas_reboot_nb = { | |
509 | .notifier_call = dcdbas_reboot_notify, | |
510 | .next = NULL, | |
e041c683 | 511 | .priority = INT_MIN |
90563ec4 DW |
512 | }; |
513 | ||
514 | static DCDBAS_BIN_ATTR_RW(smi_data); | |
515 | ||
516 | static struct bin_attribute *dcdbas_bin_attrs[] = { | |
517 | &bin_attr_smi_data, | |
518 | NULL | |
519 | }; | |
520 | ||
521 | static DCDBAS_DEV_ATTR_RW(smi_data_buf_size); | |
522 | static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr); | |
523 | static DCDBAS_DEV_ATTR_WO(smi_request); | |
524 | static DCDBAS_DEV_ATTR_RW(host_control_action); | |
525 | static DCDBAS_DEV_ATTR_RW(host_control_smi_type); | |
526 | static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown); | |
527 | ||
a7f3ea72 DT |
528 | static struct attribute *dcdbas_dev_attrs[] = { |
529 | &dev_attr_smi_data_buf_size.attr, | |
530 | &dev_attr_smi_data_buf_phys_addr.attr, | |
531 | &dev_attr_smi_request.attr, | |
532 | &dev_attr_host_control_action.attr, | |
533 | &dev_attr_host_control_smi_type.attr, | |
534 | &dev_attr_host_control_on_shutdown.attr, | |
90563ec4 DW |
535 | NULL |
536 | }; | |
537 | ||
a7f3ea72 DT |
538 | static struct attribute_group dcdbas_attr_group = { |
539 | .attrs = dcdbas_dev_attrs, | |
540 | }; | |
541 | ||
542 | static int __devinit dcdbas_probe(struct platform_device *dev) | |
90563ec4 | 543 | { |
a7f3ea72 | 544 | int i, error; |
90563ec4 DW |
545 | |
546 | host_control_action = HC_ACTION_NONE; | |
547 | host_control_smi_type = HC_SMITYPE_NONE; | |
548 | ||
90563ec4 DW |
549 | /* |
550 | * BIOS SMI calls require buffer addresses be in 32-bit address space. | |
551 | * This is done by setting the DMA mask below. | |
552 | */ | |
553 | dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK; | |
554 | dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask; | |
555 | ||
a7f3ea72 DT |
556 | error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group); |
557 | if (error) | |
558 | return error; | |
559 | ||
560 | for (i = 0; dcdbas_bin_attrs[i]; i++) { | |
561 | error = sysfs_create_bin_file(&dev->dev.kobj, | |
562 | dcdbas_bin_attrs[i]); | |
563 | if (error) { | |
564 | while (--i >= 0) | |
565 | sysfs_remove_bin_file(&dev->dev.kobj, | |
566 | dcdbas_bin_attrs[i]); | |
0968cf51 | 567 | sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group); |
a7f3ea72 DT |
568 | return error; |
569 | } | |
570 | } | |
571 | ||
90563ec4 DW |
572 | register_reboot_notifier(&dcdbas_reboot_nb); |
573 | ||
a7f3ea72 DT |
574 | dev_info(&dev->dev, "%s (version %s)\n", |
575 | DRIVER_DESCRIPTION, DRIVER_VERSION); | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | static int __devexit dcdbas_remove(struct platform_device *dev) | |
581 | { | |
582 | int i; | |
583 | ||
584 | unregister_reboot_notifier(&dcdbas_reboot_nb); | |
90563ec4 | 585 | for (i = 0; dcdbas_bin_attrs[i]; i++) |
a7f3ea72 DT |
586 | sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]); |
587 | sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group); | |
90563ec4 | 588 | |
a7f3ea72 DT |
589 | return 0; |
590 | } | |
90563ec4 | 591 | |
a7f3ea72 DT |
592 | static struct platform_driver dcdbas_driver = { |
593 | .driver = { | |
594 | .name = DRIVER_NAME, | |
595 | .owner = THIS_MODULE, | |
596 | }, | |
597 | .probe = dcdbas_probe, | |
598 | .remove = __devexit_p(dcdbas_remove), | |
599 | }; | |
600 | ||
601 | /** | |
602 | * dcdbas_init: initialize driver | |
603 | */ | |
604 | static int __init dcdbas_init(void) | |
605 | { | |
606 | int error; | |
607 | ||
608 | error = platform_driver_register(&dcdbas_driver); | |
609 | if (error) | |
610 | return error; | |
611 | ||
612 | dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1); | |
613 | if (!dcdbas_pdev) { | |
614 | error = -ENOMEM; | |
615 | goto err_unregister_driver; | |
616 | } | |
617 | ||
618 | error = platform_device_add(dcdbas_pdev); | |
619 | if (error) | |
620 | goto err_free_device; | |
90563ec4 DW |
621 | |
622 | return 0; | |
a7f3ea72 DT |
623 | |
624 | err_free_device: | |
625 | platform_device_put(dcdbas_pdev); | |
626 | err_unregister_driver: | |
627 | platform_driver_unregister(&dcdbas_driver); | |
628 | return error; | |
90563ec4 DW |
629 | } |
630 | ||
631 | /** | |
632 | * dcdbas_exit: perform driver cleanup | |
633 | */ | |
634 | static void __exit dcdbas_exit(void) | |
635 | { | |
435a80f6 DW |
636 | /* |
637 | * make sure functions that use dcdbas_pdev are called | |
638 | * before platform_device_unregister | |
639 | */ | |
90563ec4 DW |
640 | unregister_reboot_notifier(&dcdbas_reboot_nb); |
641 | smi_data_buf_free(); | |
435a80f6 | 642 | platform_device_unregister(dcdbas_pdev); |
a7f3ea72 DT |
643 | platform_driver_unregister(&dcdbas_driver); |
644 | ||
645 | /* | |
646 | * We have to free the buffer here instead of dcdbas_remove | |
647 | * because only in module exit function we can be sure that | |
648 | * all sysfs attributes belonging to this module have been | |
649 | * released. | |
650 | */ | |
651 | smi_data_buf_free(); | |
90563ec4 DW |
652 | } |
653 | ||
654 | module_init(dcdbas_init); | |
655 | module_exit(dcdbas_exit); | |
656 | ||
657 | MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")"); | |
658 | MODULE_VERSION(DRIVER_VERSION); | |
659 | MODULE_AUTHOR("Dell Inc."); | |
660 | MODULE_LICENSE("GPL"); | |
661 |