Commit | Line | Data |
---|---|---|
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 | * | |
11 | * Copyright (C) 1995-2005 Dell Inc. | |
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" | |
435a80f6 | 43 | #define DRIVER_VERSION "5.6.0-2" |
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 | ||
152 | static ssize_t smi_data_read(struct kobject *kobj, char *buf, loff_t pos, | |
153 | size_t count) | |
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 | ||
173 | static ssize_t smi_data_write(struct kobject *kobj, char *buf, loff_t pos, | |
174 | size_t count) | |
175 | { | |
176 | ssize_t ret; | |
177 | ||
8ed965d6 | 178 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
179 | |
180 | ret = smi_data_buf_realloc(pos + count); | |
181 | if (ret) | |
182 | goto out; | |
183 | ||
184 | memcpy(smi_data_buf + pos, buf, count); | |
185 | ret = count; | |
186 | out: | |
8ed965d6 | 187 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
188 | return ret; |
189 | } | |
190 | ||
191 | static ssize_t host_control_action_show(struct device *dev, | |
192 | struct device_attribute *attr, | |
193 | char *buf) | |
194 | { | |
195 | return sprintf(buf, "%u\n", host_control_action); | |
196 | } | |
197 | ||
198 | static ssize_t host_control_action_store(struct device *dev, | |
199 | struct device_attribute *attr, | |
200 | const char *buf, size_t count) | |
201 | { | |
202 | ssize_t ret; | |
203 | ||
204 | /* make sure buffer is available for host control command */ | |
8ed965d6 | 205 | mutex_lock(&smi_data_lock); |
90563ec4 | 206 | ret = smi_data_buf_realloc(sizeof(struct apm_cmd)); |
8ed965d6 | 207 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
208 | if (ret) |
209 | return ret; | |
210 | ||
211 | host_control_action = simple_strtoul(buf, NULL, 10); | |
212 | return count; | |
213 | } | |
214 | ||
215 | static ssize_t host_control_smi_type_show(struct device *dev, | |
216 | struct device_attribute *attr, | |
217 | char *buf) | |
218 | { | |
219 | return sprintf(buf, "%u\n", host_control_smi_type); | |
220 | } | |
221 | ||
222 | static ssize_t host_control_smi_type_store(struct device *dev, | |
223 | struct device_attribute *attr, | |
224 | const char *buf, size_t count) | |
225 | { | |
226 | host_control_smi_type = simple_strtoul(buf, NULL, 10); | |
227 | return count; | |
228 | } | |
229 | ||
230 | static ssize_t host_control_on_shutdown_show(struct device *dev, | |
231 | struct device_attribute *attr, | |
232 | char *buf) | |
233 | { | |
234 | return sprintf(buf, "%u\n", host_control_on_shutdown); | |
235 | } | |
236 | ||
237 | static ssize_t host_control_on_shutdown_store(struct device *dev, | |
238 | struct device_attribute *attr, | |
239 | const char *buf, size_t count) | |
240 | { | |
241 | host_control_on_shutdown = simple_strtoul(buf, NULL, 10); | |
242 | return count; | |
243 | } | |
244 | ||
245 | /** | |
246 | * smi_request: generate SMI request | |
247 | * | |
248 | * Called with smi_data_lock. | |
249 | */ | |
250 | static int smi_request(struct smi_cmd *smi_cmd) | |
251 | { | |
252 | cpumask_t old_mask; | |
253 | int ret = 0; | |
254 | ||
255 | if (smi_cmd->magic != SMI_CMD_MAGIC) { | |
256 | dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n", | |
257 | __FUNCTION__); | |
258 | return -EBADR; | |
259 | } | |
260 | ||
261 | /* SMI requires CPU 0 */ | |
262 | old_mask = current->cpus_allowed; | |
263 | set_cpus_allowed(current, cpumask_of_cpu(0)); | |
264 | if (smp_processor_id() != 0) { | |
265 | dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n", | |
266 | __FUNCTION__); | |
267 | ret = -EBUSY; | |
268 | goto out; | |
269 | } | |
270 | ||
271 | /* generate SMI */ | |
272 | asm volatile ( | |
273 | "outb %b0,%w1" | |
274 | : /* no output args */ | |
275 | : "a" (smi_cmd->command_code), | |
276 | "d" (smi_cmd->command_address), | |
277 | "b" (smi_cmd->ebx), | |
278 | "c" (smi_cmd->ecx) | |
279 | : "memory" | |
280 | ); | |
281 | ||
282 | out: | |
283 | set_cpus_allowed(current, old_mask); | |
284 | 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 | */ | |
298 | static 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 | ||
8ed965d6 | 306 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
307 | |
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 */ | |
317 | ret = smi_request(smi_cmd); | |
318 | 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); | |
324 | ret = smi_request(smi_cmd); | |
325 | 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 | ||
337 | out: | |
8ed965d6 | 338 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
339 | return ret; |
340 | } | |
341 | ||
342 | /** | |
343 | * host_control_smi: generate host control SMI | |
344 | * | |
345 | * Caller must set up the host control command in smi_data_buf. | |
346 | */ | |
347 | static 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", | |
427 | __FUNCTION__, host_control_smi_type); | |
428 | 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 | */ | |
443 | static 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) { | |
455 | dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __FUNCTION__); | |
456 | 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", | |
461 | __FUNCTION__); | |
462 | 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 | */ | |
484 | static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code, | |
485 | void *unused) | |
486 | { | |
90563ec4 DW |
487 | 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 */ | |
e041c683 AS |
493 | printk(KERN_WARNING "Please wait for shutdown " |
494 | "action to complete...\n"); | |
495 | dcdbas_host_control(); | |
90563ec4 DW |
496 | } |
497 | break; | |
498 | } | |
499 | ||
500 | return NOTIFY_DONE; | |
501 | } | |
502 | ||
503 | static struct notifier_block dcdbas_reboot_nb = { | |
504 | .notifier_call = dcdbas_reboot_notify, | |
505 | .next = NULL, | |
e041c683 | 506 | .priority = INT_MIN |
90563ec4 DW |
507 | }; |
508 | ||
509 | static DCDBAS_BIN_ATTR_RW(smi_data); | |
510 | ||
511 | static struct bin_attribute *dcdbas_bin_attrs[] = { | |
512 | &bin_attr_smi_data, | |
513 | NULL | |
514 | }; | |
515 | ||
516 | static DCDBAS_DEV_ATTR_RW(smi_data_buf_size); | |
517 | static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr); | |
518 | static DCDBAS_DEV_ATTR_WO(smi_request); | |
519 | static DCDBAS_DEV_ATTR_RW(host_control_action); | |
520 | static DCDBAS_DEV_ATTR_RW(host_control_smi_type); | |
521 | static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown); | |
522 | ||
a7f3ea72 DT |
523 | static 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, | |
90563ec4 DW |
530 | NULL |
531 | }; | |
532 | ||
a7f3ea72 DT |
533 | static struct attribute_group dcdbas_attr_group = { |
534 | .attrs = dcdbas_dev_attrs, | |
535 | }; | |
536 | ||
537 | static int __devinit dcdbas_probe(struct platform_device *dev) | |
90563ec4 | 538 | { |
a7f3ea72 | 539 | int i, error; |
90563ec4 DW |
540 | |
541 | host_control_action = HC_ACTION_NONE; | |
542 | host_control_smi_type = HC_SMITYPE_NONE; | |
543 | ||
90563ec4 DW |
544 | /* |
545 | * BIOS SMI calls require buffer addresses be in 32-bit address space. | |
546 | * This is done by setting the DMA mask below. | |
547 | */ | |
548 | dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK; | |
549 | dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask; | |
550 | ||
a7f3ea72 DT |
551 | 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]); | |
562 | sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group); | |
563 | return error; | |
564 | } | |
565 | } | |
566 | ||
90563ec4 DW |
567 | register_reboot_notifier(&dcdbas_reboot_nb); |
568 | ||
a7f3ea72 DT |
569 | dev_info(&dev->dev, "%s (version %s)\n", |
570 | DRIVER_DESCRIPTION, DRIVER_VERSION); | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
575 | static int __devexit dcdbas_remove(struct platform_device *dev) | |
576 | { | |
577 | int i; | |
578 | ||
579 | unregister_reboot_notifier(&dcdbas_reboot_nb); | |
90563ec4 | 580 | for (i = 0; dcdbas_bin_attrs[i]; i++) |
a7f3ea72 DT |
581 | sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]); |
582 | sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group); | |
90563ec4 | 583 | |
a7f3ea72 DT |
584 | return 0; |
585 | } | |
90563ec4 | 586 | |
a7f3ea72 DT |
587 | static 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 | */ | |
599 | static 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; | |
90563ec4 DW |
616 | |
617 | return 0; | |
a7f3ea72 DT |
618 | |
619 | err_free_device: | |
620 | platform_device_put(dcdbas_pdev); | |
621 | err_unregister_driver: | |
622 | platform_driver_unregister(&dcdbas_driver); | |
623 | return error; | |
90563ec4 DW |
624 | } |
625 | ||
626 | /** | |
627 | * dcdbas_exit: perform driver cleanup | |
628 | */ | |
629 | static void __exit dcdbas_exit(void) | |
630 | { | |
435a80f6 DW |
631 | /* |
632 | * make sure functions that use dcdbas_pdev are called | |
633 | * before platform_device_unregister | |
634 | */ | |
90563ec4 DW |
635 | unregister_reboot_notifier(&dcdbas_reboot_nb); |
636 | smi_data_buf_free(); | |
435a80f6 | 637 | platform_device_unregister(dcdbas_pdev); |
a7f3ea72 DT |
638 | 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(); | |
90563ec4 DW |
647 | } |
648 | ||
649 | module_init(dcdbas_init); | |
650 | module_exit(dcdbas_exit); | |
651 | ||
652 | MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")"); | |
653 | MODULE_VERSION(DRIVER_VERSION); | |
654 | MODULE_AUTHOR("Dell Inc."); | |
655 | MODULE_LICENSE("GPL"); | |
656 |