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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> | |
e23f22b5 | 26 | #include <linux/cpu.h> |
5a0e3ad6 | 27 | #include <linux/gfp.h> |
90563ec4 DW |
28 | #include <linux/init.h> |
29 | #include <linux/kernel.h> | |
30 | #include <linux/mc146818rtc.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/reboot.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/smp.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/string.h> | |
37 | #include <linux/types.h> | |
8ed965d6 | 38 | #include <linux/mutex.h> |
90563ec4 | 39 | #include <asm/io.h> |
90563ec4 DW |
40 | |
41 | #include "dcdbas.h" | |
42 | ||
43 | #define DRIVER_NAME "dcdbas" | |
b95936cb | 44 | #define DRIVER_VERSION "5.6.0-3.2" |
90563ec4 DW |
45 | #define DRIVER_DESCRIPTION "Dell Systems Management Base Driver" |
46 | ||
47 | static struct platform_device *dcdbas_pdev; | |
48 | ||
49 | static u8 *smi_data_buf; | |
50 | static dma_addr_t smi_data_buf_handle; | |
51 | static unsigned long smi_data_buf_size; | |
52 | static u32 smi_data_buf_phys_addr; | |
8ed965d6 | 53 | static DEFINE_MUTEX(smi_data_lock); |
90563ec4 DW |
54 | |
55 | static unsigned int host_control_action; | |
56 | static unsigned int host_control_smi_type; | |
57 | static unsigned int host_control_on_shutdown; | |
58 | ||
59 | /** | |
60 | * smi_data_buf_free: free SMI data buffer | |
61 | */ | |
62 | static void smi_data_buf_free(void) | |
63 | { | |
64 | if (!smi_data_buf) | |
65 | return; | |
66 | ||
67 | dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n", | |
eecd5853 | 68 | __func__, smi_data_buf_phys_addr, smi_data_buf_size); |
90563ec4 DW |
69 | |
70 | dma_free_coherent(&dcdbas_pdev->dev, smi_data_buf_size, smi_data_buf, | |
71 | smi_data_buf_handle); | |
72 | smi_data_buf = NULL; | |
73 | smi_data_buf_handle = 0; | |
74 | smi_data_buf_phys_addr = 0; | |
75 | smi_data_buf_size = 0; | |
76 | } | |
77 | ||
78 | /** | |
79 | * smi_data_buf_realloc: grow SMI data buffer if needed | |
80 | */ | |
81 | static int smi_data_buf_realloc(unsigned long size) | |
82 | { | |
83 | void *buf; | |
84 | dma_addr_t handle; | |
85 | ||
86 | if (smi_data_buf_size >= size) | |
87 | return 0; | |
88 | ||
89 | if (size > MAX_SMI_DATA_BUF_SIZE) | |
90 | return -EINVAL; | |
91 | ||
92 | /* new buffer is needed */ | |
93 | buf = dma_alloc_coherent(&dcdbas_pdev->dev, size, &handle, GFP_KERNEL); | |
94 | if (!buf) { | |
95 | dev_dbg(&dcdbas_pdev->dev, | |
96 | "%s: failed to allocate memory size %lu\n", | |
eecd5853 | 97 | __func__, size); |
90563ec4 DW |
98 | return -ENOMEM; |
99 | } | |
100 | /* memory zeroed by dma_alloc_coherent */ | |
101 | ||
102 | if (smi_data_buf) | |
103 | memcpy(buf, smi_data_buf, smi_data_buf_size); | |
104 | ||
105 | /* free any existing buffer */ | |
106 | smi_data_buf_free(); | |
107 | ||
108 | /* set up new buffer for use */ | |
109 | smi_data_buf = buf; | |
110 | smi_data_buf_handle = handle; | |
111 | smi_data_buf_phys_addr = (u32) virt_to_phys(buf); | |
112 | smi_data_buf_size = size; | |
113 | ||
114 | dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n", | |
eecd5853 | 115 | __func__, smi_data_buf_phys_addr, smi_data_buf_size); |
90563ec4 DW |
116 | |
117 | return 0; | |
118 | } | |
119 | ||
120 | static ssize_t smi_data_buf_phys_addr_show(struct device *dev, | |
121 | struct device_attribute *attr, | |
122 | char *buf) | |
123 | { | |
124 | return sprintf(buf, "%x\n", smi_data_buf_phys_addr); | |
125 | } | |
126 | ||
127 | static ssize_t smi_data_buf_size_show(struct device *dev, | |
128 | struct device_attribute *attr, | |
129 | char *buf) | |
130 | { | |
131 | return sprintf(buf, "%lu\n", smi_data_buf_size); | |
132 | } | |
133 | ||
134 | static ssize_t smi_data_buf_size_store(struct device *dev, | |
135 | struct device_attribute *attr, | |
136 | const char *buf, size_t count) | |
137 | { | |
138 | unsigned long buf_size; | |
139 | ssize_t ret; | |
140 | ||
141 | buf_size = simple_strtoul(buf, NULL, 10); | |
142 | ||
143 | /* make sure SMI data buffer is at least buf_size */ | |
8ed965d6 | 144 | mutex_lock(&smi_data_lock); |
90563ec4 | 145 | ret = smi_data_buf_realloc(buf_size); |
8ed965d6 | 146 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
147 | if (ret) |
148 | return ret; | |
149 | ||
150 | return count; | |
151 | } | |
152 | ||
2c3c8bea | 153 | static ssize_t smi_data_read(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
154 | struct bin_attribute *bin_attr, |
155 | char *buf, loff_t pos, size_t count) | |
90563ec4 | 156 | { |
90563ec4 DW |
157 | ssize_t ret; |
158 | ||
8ed965d6 | 159 | mutex_lock(&smi_data_lock); |
abe19b7b AM |
160 | ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf, |
161 | smi_data_buf_size); | |
8ed965d6 | 162 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
163 | return ret; |
164 | } | |
165 | ||
2c3c8bea | 166 | static ssize_t smi_data_write(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
167 | struct bin_attribute *bin_attr, |
168 | char *buf, loff_t pos, size_t count) | |
90563ec4 DW |
169 | { |
170 | ssize_t ret; | |
171 | ||
b95936cb DW |
172 | if ((pos + count) > MAX_SMI_DATA_BUF_SIZE) |
173 | return -EINVAL; | |
174 | ||
8ed965d6 | 175 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
176 | |
177 | ret = smi_data_buf_realloc(pos + count); | |
178 | if (ret) | |
179 | goto out; | |
180 | ||
181 | memcpy(smi_data_buf + pos, buf, count); | |
182 | ret = count; | |
183 | out: | |
8ed965d6 | 184 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
185 | return ret; |
186 | } | |
187 | ||
188 | static ssize_t host_control_action_show(struct device *dev, | |
189 | struct device_attribute *attr, | |
190 | char *buf) | |
191 | { | |
192 | return sprintf(buf, "%u\n", host_control_action); | |
193 | } | |
194 | ||
195 | static ssize_t host_control_action_store(struct device *dev, | |
196 | struct device_attribute *attr, | |
197 | const char *buf, size_t count) | |
198 | { | |
199 | ssize_t ret; | |
200 | ||
201 | /* make sure buffer is available for host control command */ | |
8ed965d6 | 202 | mutex_lock(&smi_data_lock); |
90563ec4 | 203 | ret = smi_data_buf_realloc(sizeof(struct apm_cmd)); |
8ed965d6 | 204 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
205 | if (ret) |
206 | return ret; | |
207 | ||
208 | host_control_action = simple_strtoul(buf, NULL, 10); | |
209 | return count; | |
210 | } | |
211 | ||
212 | static ssize_t host_control_smi_type_show(struct device *dev, | |
213 | struct device_attribute *attr, | |
214 | char *buf) | |
215 | { | |
216 | return sprintf(buf, "%u\n", host_control_smi_type); | |
217 | } | |
218 | ||
219 | static ssize_t host_control_smi_type_store(struct device *dev, | |
220 | struct device_attribute *attr, | |
221 | const char *buf, size_t count) | |
222 | { | |
223 | host_control_smi_type = simple_strtoul(buf, NULL, 10); | |
224 | return count; | |
225 | } | |
226 | ||
227 | static ssize_t host_control_on_shutdown_show(struct device *dev, | |
228 | struct device_attribute *attr, | |
229 | char *buf) | |
230 | { | |
231 | return sprintf(buf, "%u\n", host_control_on_shutdown); | |
232 | } | |
233 | ||
234 | static ssize_t host_control_on_shutdown_store(struct device *dev, | |
235 | struct device_attribute *attr, | |
236 | const char *buf, size_t count) | |
237 | { | |
238 | host_control_on_shutdown = simple_strtoul(buf, NULL, 10); | |
239 | return count; | |
240 | } | |
241 | ||
e23f22b5 | 242 | static int raise_smi(void *par) |
90563ec4 | 243 | { |
e23f22b5 | 244 | struct smi_cmd *smi_cmd = par; |
90563ec4 | 245 | |
90563ec4 DW |
246 | if (smp_processor_id() != 0) { |
247 | dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n", | |
eecd5853 | 248 | __func__); |
e23f22b5 | 249 | return -EBUSY; |
90563ec4 DW |
250 | } |
251 | ||
252 | /* generate SMI */ | |
dd65c736 | 253 | /* inb to force posted write through and make SMI happen now */ |
90563ec4 | 254 | asm volatile ( |
dd65c736 SH |
255 | "outb %b0,%w1\n" |
256 | "inb %w1" | |
90563ec4 DW |
257 | : /* no output args */ |
258 | : "a" (smi_cmd->command_code), | |
259 | "d" (smi_cmd->command_address), | |
260 | "b" (smi_cmd->ebx), | |
261 | "c" (smi_cmd->ecx) | |
262 | : "memory" | |
263 | ); | |
264 | ||
e23f22b5 JG |
265 | return 0; |
266 | } | |
267 | /** | |
268 | * dcdbas_smi_request: generate SMI request | |
269 | * | |
270 | * Called with smi_data_lock. | |
271 | */ | |
272 | int dcdbas_smi_request(struct smi_cmd *smi_cmd) | |
273 | { | |
274 | int ret; | |
275 | ||
276 | if (smi_cmd->magic != SMI_CMD_MAGIC) { | |
277 | dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n", | |
278 | __func__); | |
279 | return -EBADR; | |
280 | } | |
281 | ||
282 | /* SMI requires CPU 0 */ | |
283 | get_online_cpus(); | |
284 | ret = smp_call_on_cpu(0, raise_smi, smi_cmd, true); | |
285 | put_online_cpus(); | |
286 | ||
90563ec4 DW |
287 | return ret; |
288 | } | |
289 | ||
290 | /** | |
291 | * smi_request_store: | |
292 | * | |
293 | * The valid values are: | |
294 | * 0: zero SMI data buffer | |
295 | * 1: generate calling interface SMI | |
296 | * 2: generate raw SMI | |
297 | * | |
298 | * User application writes smi_cmd to smi_data before telling driver | |
299 | * to generate SMI. | |
300 | */ | |
301 | static ssize_t smi_request_store(struct device *dev, | |
302 | struct device_attribute *attr, | |
303 | const char *buf, size_t count) | |
304 | { | |
305 | struct smi_cmd *smi_cmd; | |
306 | unsigned long val = simple_strtoul(buf, NULL, 10); | |
307 | ssize_t ret; | |
308 | ||
8ed965d6 | 309 | mutex_lock(&smi_data_lock); |
90563ec4 DW |
310 | |
311 | if (smi_data_buf_size < sizeof(struct smi_cmd)) { | |
312 | ret = -ENODEV; | |
313 | goto out; | |
314 | } | |
315 | smi_cmd = (struct smi_cmd *)smi_data_buf; | |
316 | ||
317 | switch (val) { | |
318 | case 2: | |
319 | /* Raw SMI */ | |
3cab7fd9 | 320 | ret = dcdbas_smi_request(smi_cmd); |
90563ec4 DW |
321 | if (!ret) |
322 | ret = count; | |
323 | break; | |
324 | case 1: | |
325 | /* Calling Interface SMI */ | |
326 | smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer); | |
3cab7fd9 | 327 | ret = dcdbas_smi_request(smi_cmd); |
90563ec4 DW |
328 | if (!ret) |
329 | ret = count; | |
330 | break; | |
331 | case 0: | |
332 | memset(smi_data_buf, 0, smi_data_buf_size); | |
333 | ret = count; | |
334 | break; | |
335 | default: | |
336 | ret = -EINVAL; | |
337 | break; | |
338 | } | |
339 | ||
340 | out: | |
8ed965d6 | 341 | mutex_unlock(&smi_data_lock); |
90563ec4 DW |
342 | return ret; |
343 | } | |
3cab7fd9 | 344 | EXPORT_SYMBOL(dcdbas_smi_request); |
90563ec4 DW |
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", | |
eecd5853 | 431 | __func__, host_control_smi_type); |
90563ec4 DW |
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) { | |
eecd5853 | 459 | dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __func__); |
90563ec4 DW |
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", | |
eecd5853 | 465 | __func__); |
90563ec4 DW |
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, | |
4c33dea7 | 539 | .bin_attrs = dcdbas_bin_attrs, |
a7f3ea72 DT |
540 | }; |
541 | ||
0fe763c5 | 542 | static int dcdbas_probe(struct platform_device *dev) |
90563ec4 | 543 | { |
4c33dea7 | 544 | int error; |
90563ec4 DW |
545 | |
546 | host_control_action = HC_ACTION_NONE; | |
547 | host_control_smi_type = HC_SMITYPE_NONE; | |
548 | ||
20d897e4 RK |
549 | dcdbas_pdev = dev; |
550 | ||
90563ec4 DW |
551 | /* |
552 | * BIOS SMI calls require buffer addresses be in 32-bit address space. | |
553 | * This is done by setting the DMA mask below. | |
554 | */ | |
20d897e4 RK |
555 | error = dma_set_coherent_mask(&dcdbas_pdev->dev, DMA_BIT_MASK(32)); |
556 | if (error) | |
557 | return error; | |
90563ec4 | 558 | |
a7f3ea72 DT |
559 | error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group); |
560 | if (error) | |
561 | return error; | |
562 | ||
90563ec4 DW |
563 | register_reboot_notifier(&dcdbas_reboot_nb); |
564 | ||
a7f3ea72 DT |
565 | dev_info(&dev->dev, "%s (version %s)\n", |
566 | DRIVER_DESCRIPTION, DRIVER_VERSION); | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
0fe763c5 | 571 | static int dcdbas_remove(struct platform_device *dev) |
a7f3ea72 | 572 | { |
a7f3ea72 | 573 | unregister_reboot_notifier(&dcdbas_reboot_nb); |
a7f3ea72 | 574 | sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group); |
90563ec4 | 575 | |
a7f3ea72 DT |
576 | return 0; |
577 | } | |
90563ec4 | 578 | |
a7f3ea72 DT |
579 | static struct platform_driver dcdbas_driver = { |
580 | .driver = { | |
581 | .name = DRIVER_NAME, | |
a7f3ea72 DT |
582 | }, |
583 | .probe = dcdbas_probe, | |
0fe763c5 | 584 | .remove = dcdbas_remove, |
a7f3ea72 DT |
585 | }; |
586 | ||
3be5588a | 587 | static const struct platform_device_info dcdbas_dev_info __initconst = { |
20d897e4 RK |
588 | .name = DRIVER_NAME, |
589 | .id = -1, | |
590 | .dma_mask = DMA_BIT_MASK(32), | |
591 | }; | |
592 | ||
593 | static struct platform_device *dcdbas_pdev_reg; | |
594 | ||
a7f3ea72 DT |
595 | /** |
596 | * dcdbas_init: initialize driver | |
597 | */ | |
598 | static int __init dcdbas_init(void) | |
599 | { | |
600 | int error; | |
601 | ||
602 | error = platform_driver_register(&dcdbas_driver); | |
603 | if (error) | |
604 | return error; | |
605 | ||
20d897e4 RK |
606 | dcdbas_pdev_reg = platform_device_register_full(&dcdbas_dev_info); |
607 | if (IS_ERR(dcdbas_pdev_reg)) { | |
608 | error = PTR_ERR(dcdbas_pdev_reg); | |
a7f3ea72 DT |
609 | goto err_unregister_driver; |
610 | } | |
611 | ||
90563ec4 | 612 | return 0; |
a7f3ea72 | 613 | |
a7f3ea72 DT |
614 | err_unregister_driver: |
615 | platform_driver_unregister(&dcdbas_driver); | |
616 | return error; | |
90563ec4 DW |
617 | } |
618 | ||
619 | /** | |
620 | * dcdbas_exit: perform driver cleanup | |
621 | */ | |
622 | static void __exit dcdbas_exit(void) | |
623 | { | |
435a80f6 DW |
624 | /* |
625 | * make sure functions that use dcdbas_pdev are called | |
626 | * before platform_device_unregister | |
627 | */ | |
90563ec4 | 628 | unregister_reboot_notifier(&dcdbas_reboot_nb); |
a7f3ea72 DT |
629 | |
630 | /* | |
631 | * We have to free the buffer here instead of dcdbas_remove | |
632 | * because only in module exit function we can be sure that | |
633 | * all sysfs attributes belonging to this module have been | |
634 | * released. | |
635 | */ | |
20d897e4 RK |
636 | if (dcdbas_pdev) |
637 | smi_data_buf_free(); | |
638 | platform_device_unregister(dcdbas_pdev_reg); | |
e3ed249a | 639 | platform_driver_unregister(&dcdbas_driver); |
90563ec4 DW |
640 | } |
641 | ||
642 | module_init(dcdbas_init); | |
643 | module_exit(dcdbas_exit); | |
644 | ||
645 | MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")"); | |
646 | MODULE_VERSION(DRIVER_VERSION); | |
647 | MODULE_AUTHOR("Dell Inc."); | |
648 | MODULE_LICENSE("GPL"); | |
8f47f0b6 MD |
649 | /* Any System or BIOS claiming to be by Dell */ |
650 | MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*"); |