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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2004 Intel Corporation <naveen.b.s@intel.com> | |
3 | * | |
4 | * All rights reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or (at | |
9 | * your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
14 | * NON INFRINGEMENT. See the GNU General Public License for more | |
15 | * details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | * | |
21 | * | |
22 | * ACPI based HotPlug driver that supports Memory Hotplug | |
23 | * This driver fields notifications from firmare for memory add | |
24 | * and remove operations and alerts the VM of the affected memory | |
25 | * ranges. | |
26 | */ | |
27 | ||
28 | #include <linux/kernel.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/memory_hotplug.h> | |
33 | #include <acpi/acpi_drivers.h> | |
34 | ||
1da177e4 LT |
35 | #define ACPI_MEMORY_DEVICE_COMPONENT 0x08000000UL |
36 | #define ACPI_MEMORY_DEVICE_CLASS "memory" | |
37 | #define ACPI_MEMORY_DEVICE_HID "PNP0C80" | |
38 | #define ACPI_MEMORY_DEVICE_DRIVER_NAME "Hotplug Mem Driver" | |
39 | #define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device" | |
40 | ||
41 | #define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT | |
42 | ||
4be44fcd LB |
43 | ACPI_MODULE_NAME("acpi_memory") |
44 | MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>"); | |
1da177e4 LT |
45 | MODULE_DESCRIPTION(ACPI_MEMORY_DEVICE_DRIVER_NAME); |
46 | MODULE_LICENSE("GPL"); | |
47 | ||
48 | /* ACPI _STA method values */ | |
49 | #define ACPI_MEMORY_STA_PRESENT (0x00000001UL) | |
50 | #define ACPI_MEMORY_STA_ENABLED (0x00000002UL) | |
51 | #define ACPI_MEMORY_STA_FUNCTIONAL (0x00000008UL) | |
52 | ||
53 | /* Memory Device States */ | |
54 | #define MEMORY_INVALID_STATE 0 | |
55 | #define MEMORY_POWER_ON_STATE 1 | |
56 | #define MEMORY_POWER_OFF_STATE 2 | |
57 | ||
4be44fcd LB |
58 | static int acpi_memory_device_add(struct acpi_device *device); |
59 | static int acpi_memory_device_remove(struct acpi_device *device, int type); | |
1f425994 | 60 | static int acpi_memory_device_start(struct acpi_device *device); |
1da177e4 LT |
61 | |
62 | static struct acpi_driver acpi_memory_device_driver = { | |
4be44fcd LB |
63 | .name = ACPI_MEMORY_DEVICE_DRIVER_NAME, |
64 | .class = ACPI_MEMORY_DEVICE_CLASS, | |
65 | .ids = ACPI_MEMORY_DEVICE_HID, | |
66 | .ops = { | |
67 | .add = acpi_memory_device_add, | |
68 | .remove = acpi_memory_device_remove, | |
1f425994 | 69 | .start = acpi_memory_device_start, |
4be44fcd | 70 | }, |
1da177e4 LT |
71 | }; |
72 | ||
9ac02398 KH |
73 | struct acpi_memory_info { |
74 | struct list_head list; | |
75 | u64 start_addr; /* Memory Range start physical addr */ | |
76 | u64 length; /* Memory Range length */ | |
77 | unsigned short caching; /* memory cache attribute */ | |
78 | unsigned short write_protect; /* memory read/write attribute */ | |
79 | unsigned int enabled:1; | |
80 | }; | |
81 | ||
1da177e4 | 82 | struct acpi_memory_device { |
3b74863d | 83 | struct acpi_device * device; |
4be44fcd | 84 | unsigned int state; /* State of the memory device */ |
9ac02398 | 85 | struct list_head res_list; |
1da177e4 LT |
86 | }; |
87 | ||
9ac02398 KH |
88 | static acpi_status |
89 | acpi_memory_get_resource(struct acpi_resource *resource, void *context) | |
90 | { | |
91 | struct acpi_memory_device *mem_device = context; | |
92 | struct acpi_resource_address64 address64; | |
93 | struct acpi_memory_info *info, *new; | |
94 | acpi_status status; | |
95 | ||
96 | status = acpi_resource_to_address64(resource, &address64); | |
97 | if (ACPI_FAILURE(status) || | |
98 | (address64.resource_type != ACPI_MEMORY_RANGE)) | |
99 | return AE_OK; | |
100 | ||
101 | list_for_each_entry(info, &mem_device->res_list, list) { | |
102 | /* Can we combine the resource range information? */ | |
103 | if ((info->caching == address64.info.mem.caching) && | |
104 | (info->write_protect == address64.info.mem.write_protect) && | |
105 | (info->start_addr + info->length == address64.minimum)) { | |
106 | info->length += address64.address_length; | |
107 | return AE_OK; | |
108 | } | |
109 | } | |
110 | ||
111 | new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL); | |
112 | if (!new) | |
113 | return AE_ERROR; | |
114 | ||
115 | INIT_LIST_HEAD(&new->list); | |
116 | new->caching = address64.info.mem.caching; | |
117 | new->write_protect = address64.info.mem.write_protect; | |
118 | new->start_addr = address64.minimum; | |
119 | new->length = address64.address_length; | |
120 | list_add_tail(&new->list, &mem_device->res_list); | |
121 | ||
122 | return AE_OK; | |
123 | } | |
124 | ||
1da177e4 LT |
125 | static int |
126 | acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) | |
127 | { | |
128 | acpi_status status; | |
9ac02398 | 129 | struct acpi_memory_info *info, *n; |
1da177e4 | 130 | |
1da177e4 | 131 | |
5d2870fa KH |
132 | if (!list_empty(&mem_device->res_list)) |
133 | return 0; | |
134 | ||
b8632785 | 135 | status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS, |
9ac02398 KH |
136 | acpi_memory_get_resource, mem_device); |
137 | if (ACPI_FAILURE(status)) { | |
138 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) | |
139 | kfree(info); | |
5d2870fa | 140 | INIT_LIST_HEAD(&mem_device->res_list); |
d550d98d | 141 | return -EINVAL; |
1da177e4 LT |
142 | } |
143 | ||
d550d98d | 144 | return 0; |
1da177e4 LT |
145 | } |
146 | ||
147 | static int | |
148 | acpi_memory_get_device(acpi_handle handle, | |
4be44fcd | 149 | struct acpi_memory_device **mem_device) |
1da177e4 LT |
150 | { |
151 | acpi_status status; | |
152 | acpi_handle phandle; | |
153 | struct acpi_device *device = NULL; | |
154 | struct acpi_device *pdevice = NULL; | |
155 | ||
1da177e4 LT |
156 | |
157 | if (!acpi_bus_get_device(handle, &device) && device) | |
158 | goto end; | |
159 | ||
160 | status = acpi_get_parent(handle, &phandle); | |
161 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 162 | ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent")); |
d550d98d | 163 | return -EINVAL; |
1da177e4 LT |
164 | } |
165 | ||
166 | /* Get the parent device */ | |
167 | status = acpi_bus_get_device(phandle, &pdevice); | |
168 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 169 | ACPI_EXCEPTION((AE_INFO, status, "Cannot get acpi bus device")); |
d550d98d | 170 | return -EINVAL; |
1da177e4 LT |
171 | } |
172 | ||
173 | /* | |
174 | * Now add the notified device. This creates the acpi_device | |
175 | * and invokes .add function | |
176 | */ | |
177 | status = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE); | |
178 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 179 | ACPI_EXCEPTION((AE_INFO, status, "Cannot add acpi bus")); |
d550d98d | 180 | return -EINVAL; |
1da177e4 LT |
181 | } |
182 | ||
4be44fcd | 183 | end: |
1da177e4 LT |
184 | *mem_device = acpi_driver_data(device); |
185 | if (!(*mem_device)) { | |
4be44fcd | 186 | printk(KERN_ERR "\n driver data not found"); |
d550d98d | 187 | return -ENODEV; |
1da177e4 LT |
188 | } |
189 | ||
d550d98d | 190 | return 0; |
1da177e4 LT |
191 | } |
192 | ||
4be44fcd | 193 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
1da177e4 LT |
194 | { |
195 | unsigned long current_status; | |
196 | ||
1da177e4 LT |
197 | |
198 | /* Get device present/absent information from the _STA */ | |
b8632785 | 199 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle, "_STA", |
4be44fcd | 200 | NULL, ¤t_status))) |
d550d98d | 201 | return -ENODEV; |
1da177e4 LT |
202 | /* |
203 | * Check for device status. Device should be | |
204 | * present/enabled/functioning. | |
205 | */ | |
206 | if (!((current_status & ACPI_MEMORY_STA_PRESENT) | |
4be44fcd LB |
207 | && (current_status & ACPI_MEMORY_STA_ENABLED) |
208 | && (current_status & ACPI_MEMORY_STA_FUNCTIONAL))) | |
d550d98d | 209 | return -ENODEV; |
1da177e4 | 210 | |
d550d98d | 211 | return 0; |
1da177e4 LT |
212 | } |
213 | ||
4be44fcd | 214 | static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
1da177e4 | 215 | { |
9ac02398 KH |
216 | int result, num_enabled = 0; |
217 | struct acpi_memory_info *info; | |
1e3590e2 | 218 | int node; |
1da177e4 | 219 | |
1da177e4 LT |
220 | |
221 | /* Get the range from the _CRS */ | |
222 | result = acpi_memory_get_device_resources(mem_device); | |
223 | if (result) { | |
6468463a | 224 | printk(KERN_ERR PREFIX "get_device_resources failed\n"); |
1da177e4 LT |
225 | mem_device->state = MEMORY_INVALID_STATE; |
226 | return result; | |
227 | } | |
228 | ||
b8632785 | 229 | node = acpi_get_node(mem_device->device->handle); |
1da177e4 LT |
230 | /* |
231 | * Tell the VM there is more memory here... | |
232 | * Note: Assume that this function returns zero on success | |
9ac02398 KH |
233 | * We don't have memory-hot-add rollback function,now. |
234 | * (i.e. memory-hot-remove function) | |
1da177e4 | 235 | */ |
9ac02398 | 236 | list_for_each_entry(info, &mem_device->res_list, list) { |
fa25d8d6 | 237 | if (info->enabled) { /* just sanity check...*/ |
dd56a8e3 YG |
238 | num_enabled++; |
239 | continue; | |
240 | } | |
8c2676a5 KM |
241 | |
242 | if (node < 0) | |
243 | node = memory_add_physaddr_to_nid(info->start_addr); | |
244 | ||
bc02af93 | 245 | result = add_memory(node, info->start_addr, info->length); |
9ac02398 KH |
246 | if (result) |
247 | continue; | |
248 | info->enabled = 1; | |
249 | num_enabled++; | |
250 | } | |
251 | if (!num_enabled) { | |
0a1f1ab8 | 252 | printk(KERN_ERR PREFIX "add_memory failed\n"); |
1da177e4 | 253 | mem_device->state = MEMORY_INVALID_STATE; |
9ac02398 | 254 | return -EINVAL; |
1da177e4 LT |
255 | } |
256 | ||
257 | return result; | |
258 | } | |
259 | ||
4be44fcd | 260 | static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device) |
1da177e4 LT |
261 | { |
262 | acpi_status status; | |
4be44fcd | 263 | struct acpi_object_list arg_list; |
1da177e4 LT |
264 | union acpi_object arg; |
265 | unsigned long current_status; | |
266 | ||
1da177e4 LT |
267 | |
268 | /* Issue the _EJ0 command */ | |
269 | arg_list.count = 1; | |
270 | arg_list.pointer = &arg; | |
271 | arg.type = ACPI_TYPE_INTEGER; | |
272 | arg.integer.value = 1; | |
b8632785 | 273 | status = acpi_evaluate_object(mem_device->device->handle, |
4be44fcd | 274 | "_EJ0", &arg_list, NULL); |
1da177e4 LT |
275 | /* Return on _EJ0 failure */ |
276 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 277 | ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed")); |
d550d98d | 278 | return -ENODEV; |
1da177e4 LT |
279 | } |
280 | ||
281 | /* Evalute _STA to check if the device is disabled */ | |
b8632785 | 282 | status = acpi_evaluate_integer(mem_device->device->handle, "_STA", |
4be44fcd | 283 | NULL, ¤t_status); |
1da177e4 | 284 | if (ACPI_FAILURE(status)) |
d550d98d | 285 | return -ENODEV; |
1da177e4 LT |
286 | |
287 | /* Check for device status. Device should be disabled */ | |
288 | if (current_status & ACPI_MEMORY_STA_ENABLED) | |
d550d98d | 289 | return -EINVAL; |
1da177e4 | 290 | |
d550d98d | 291 | return 0; |
1da177e4 LT |
292 | } |
293 | ||
4be44fcd | 294 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) |
1da177e4 LT |
295 | { |
296 | int result; | |
9ac02398 | 297 | struct acpi_memory_info *info, *n; |
1da177e4 | 298 | |
1da177e4 LT |
299 | |
300 | /* | |
301 | * Ask the VM to offline this memory range. | |
302 | * Note: Assume that this function returns zero on success | |
303 | */ | |
9ac02398 KH |
304 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) { |
305 | if (info->enabled) { | |
306 | result = remove_memory(info->start_addr, info->length); | |
307 | if (result) | |
308 | return result; | |
309 | } | |
310 | kfree(info); | |
1da177e4 LT |
311 | } |
312 | ||
313 | /* Power-off and eject the device */ | |
314 | result = acpi_memory_powerdown_device(mem_device); | |
315 | if (result) { | |
1da177e4 LT |
316 | /* Set the status of the device to invalid */ |
317 | mem_device->state = MEMORY_INVALID_STATE; | |
318 | return result; | |
319 | } | |
320 | ||
321 | mem_device->state = MEMORY_POWER_OFF_STATE; | |
322 | return result; | |
323 | } | |
324 | ||
4be44fcd | 325 | static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data) |
1da177e4 LT |
326 | { |
327 | struct acpi_memory_device *mem_device; | |
328 | struct acpi_device *device; | |
329 | ||
1da177e4 LT |
330 | |
331 | switch (event) { | |
332 | case ACPI_NOTIFY_BUS_CHECK: | |
333 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 334 | "\nReceived BUS CHECK notification for device\n")); |
1da177e4 LT |
335 | /* Fall Through */ |
336 | case ACPI_NOTIFY_DEVICE_CHECK: | |
337 | if (event == ACPI_NOTIFY_DEVICE_CHECK) | |
338 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 339 | "\nReceived DEVICE CHECK notification for device\n")); |
1da177e4 | 340 | if (acpi_memory_get_device(handle, &mem_device)) { |
6468463a | 341 | printk(KERN_ERR PREFIX "Cannot find driver data\n"); |
d550d98d | 342 | return; |
1da177e4 LT |
343 | } |
344 | ||
345 | if (!acpi_memory_check_device(mem_device)) { | |
346 | if (acpi_memory_enable_device(mem_device)) | |
6468463a LB |
347 | printk(KERN_ERR PREFIX |
348 | "Cannot enable memory device\n"); | |
1da177e4 LT |
349 | } |
350 | break; | |
351 | case ACPI_NOTIFY_EJECT_REQUEST: | |
352 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 353 | "\nReceived EJECT REQUEST notification for device\n")); |
1da177e4 LT |
354 | |
355 | if (acpi_bus_get_device(handle, &device)) { | |
6468463a | 356 | printk(KERN_ERR PREFIX "Device doesn't exist\n"); |
1da177e4 LT |
357 | break; |
358 | } | |
359 | mem_device = acpi_driver_data(device); | |
360 | if (!mem_device) { | |
6468463a | 361 | printk(KERN_ERR PREFIX "Driver Data is NULL\n"); |
1da177e4 LT |
362 | break; |
363 | } | |
364 | ||
365 | /* | |
366 | * Currently disabling memory device from kernel mode | |
367 | * TBD: Can also be disabled from user mode scripts | |
368 | * TBD: Can also be disabled by Callback registration | |
4be44fcd | 369 | * with generic sysfs driver |
1da177e4 LT |
370 | */ |
371 | if (acpi_memory_disable_device(mem_device)) | |
6468463a LB |
372 | printk(KERN_ERR PREFIX |
373 | "Disable memory device\n"); | |
1da177e4 LT |
374 | /* |
375 | * TBD: Invoke acpi_bus_remove to cleanup data structures | |
376 | */ | |
377 | break; | |
378 | default: | |
379 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
4be44fcd | 380 | "Unsupported event [0x%x]\n", event)); |
1da177e4 LT |
381 | break; |
382 | } | |
383 | ||
d550d98d | 384 | return; |
1da177e4 LT |
385 | } |
386 | ||
4be44fcd | 387 | static int acpi_memory_device_add(struct acpi_device *device) |
1da177e4 LT |
388 | { |
389 | int result; | |
390 | struct acpi_memory_device *mem_device = NULL; | |
391 | ||
1da177e4 LT |
392 | |
393 | if (!device) | |
d550d98d | 394 | return -EINVAL; |
1da177e4 LT |
395 | |
396 | mem_device = kmalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); | |
397 | if (!mem_device) | |
d550d98d | 398 | return -ENOMEM; |
1da177e4 LT |
399 | memset(mem_device, 0, sizeof(struct acpi_memory_device)); |
400 | ||
9ac02398 | 401 | INIT_LIST_HEAD(&mem_device->res_list); |
3b74863d | 402 | mem_device->device = device; |
1da177e4 LT |
403 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
404 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); | |
405 | acpi_driver_data(device) = mem_device; | |
406 | ||
407 | /* Get the range from the _CRS */ | |
408 | result = acpi_memory_get_device_resources(mem_device); | |
409 | if (result) { | |
410 | kfree(mem_device); | |
d550d98d | 411 | return result; |
1da177e4 LT |
412 | } |
413 | ||
414 | /* Set the device state */ | |
415 | mem_device->state = MEMORY_POWER_ON_STATE; | |
416 | ||
417 | printk(KERN_INFO "%s \n", acpi_device_name(device)); | |
418 | ||
d550d98d | 419 | return result; |
1da177e4 LT |
420 | } |
421 | ||
4be44fcd | 422 | static int acpi_memory_device_remove(struct acpi_device *device, int type) |
1da177e4 LT |
423 | { |
424 | struct acpi_memory_device *mem_device = NULL; | |
425 | ||
1da177e4 LT |
426 | |
427 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 428 | return -EINVAL; |
1da177e4 | 429 | |
4be44fcd | 430 | mem_device = (struct acpi_memory_device *)acpi_driver_data(device); |
1da177e4 LT |
431 | kfree(mem_device); |
432 | ||
d550d98d | 433 | return 0; |
1da177e4 LT |
434 | } |
435 | ||
1f425994 YG |
436 | static int acpi_memory_device_start (struct acpi_device *device) |
437 | { | |
438 | struct acpi_memory_device *mem_device; | |
439 | int result = 0; | |
440 | ||
1f425994 YG |
441 | mem_device = acpi_driver_data(device); |
442 | ||
443 | if (!acpi_memory_check_device(mem_device)) { | |
444 | /* call add_memory func */ | |
445 | result = acpi_memory_enable_device(mem_device); | |
446 | if (result) | |
447 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
448 | "Error in acpi_memory_enable_device\n")); | |
449 | } | |
d120cfb5 | 450 | return result; |
1f425994 YG |
451 | } |
452 | ||
1da177e4 LT |
453 | /* |
454 | * Helper function to check for memory device | |
455 | */ | |
4be44fcd | 456 | static acpi_status is_memory_device(acpi_handle handle) |
1da177e4 LT |
457 | { |
458 | char *hardware_id; | |
459 | acpi_status status; | |
4be44fcd | 460 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 LT |
461 | struct acpi_device_info *info; |
462 | ||
1da177e4 LT |
463 | |
464 | status = acpi_get_object_info(handle, &buffer); | |
465 | if (ACPI_FAILURE(status)) | |
d550d98d | 466 | return status; |
1da177e4 LT |
467 | |
468 | info = buffer.pointer; | |
469 | if (!(info->valid & ACPI_VALID_HID)) { | |
02438d87 | 470 | kfree(buffer.pointer); |
d550d98d | 471 | return AE_ERROR; |
1da177e4 LT |
472 | } |
473 | ||
474 | hardware_id = info->hardware_id.value; | |
475 | if ((hardware_id == NULL) || | |
4be44fcd | 476 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) |
1da177e4 LT |
477 | status = AE_ERROR; |
478 | ||
02438d87 | 479 | kfree(buffer.pointer); |
d550d98d | 480 | return status; |
1da177e4 LT |
481 | } |
482 | ||
483 | static acpi_status | |
4be44fcd LB |
484 | acpi_memory_register_notify_handler(acpi_handle handle, |
485 | u32 level, void *ctxt, void **retv) | |
1da177e4 LT |
486 | { |
487 | acpi_status status; | |
488 | ||
1da177e4 LT |
489 | |
490 | status = is_memory_device(handle); | |
07dd4855 | 491 | if (ACPI_FAILURE(status)) |
d550d98d | 492 | return AE_OK; /* continue */ |
1da177e4 LT |
493 | |
494 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
4be44fcd | 495 | acpi_memory_device_notify, NULL); |
a6fc6720 | 496 | /* continue */ |
d550d98d | 497 | return AE_OK; |
1da177e4 LT |
498 | } |
499 | ||
500 | static acpi_status | |
4be44fcd LB |
501 | acpi_memory_deregister_notify_handler(acpi_handle handle, |
502 | u32 level, void *ctxt, void **retv) | |
1da177e4 LT |
503 | { |
504 | acpi_status status; | |
505 | ||
1da177e4 LT |
506 | |
507 | status = is_memory_device(handle); | |
07dd4855 | 508 | if (ACPI_FAILURE(status)) |
d550d98d | 509 | return AE_OK; /* continue */ |
1da177e4 LT |
510 | |
511 | status = acpi_remove_notify_handler(handle, | |
4be44fcd LB |
512 | ACPI_SYSTEM_NOTIFY, |
513 | acpi_memory_device_notify); | |
1da177e4 | 514 | |
d550d98d | 515 | return AE_OK; /* continue */ |
1da177e4 LT |
516 | } |
517 | ||
4be44fcd | 518 | static int __init acpi_memory_device_init(void) |
1da177e4 LT |
519 | { |
520 | int result; | |
521 | acpi_status status; | |
522 | ||
1da177e4 LT |
523 | |
524 | result = acpi_bus_register_driver(&acpi_memory_device_driver); | |
525 | ||
526 | if (result < 0) | |
d550d98d | 527 | return -ENODEV; |
1da177e4 LT |
528 | |
529 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
4be44fcd LB |
530 | ACPI_UINT32_MAX, |
531 | acpi_memory_register_notify_handler, | |
532 | NULL, NULL); | |
1da177e4 | 533 | |
4be44fcd | 534 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 535 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
1da177e4 | 536 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
d550d98d | 537 | return -ENODEV; |
4be44fcd | 538 | } |
1da177e4 | 539 | |
d550d98d | 540 | return 0; |
1da177e4 LT |
541 | } |
542 | ||
4be44fcd | 543 | static void __exit acpi_memory_device_exit(void) |
1da177e4 LT |
544 | { |
545 | acpi_status status; | |
546 | ||
1da177e4 LT |
547 | |
548 | /* | |
549 | * Adding this to un-install notification handlers for all the device | |
550 | * handles. | |
551 | */ | |
552 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
4be44fcd LB |
553 | ACPI_UINT32_MAX, |
554 | acpi_memory_deregister_notify_handler, | |
555 | NULL, NULL); | |
1da177e4 | 556 | |
4be44fcd | 557 | if (ACPI_FAILURE(status)) |
a6fc6720 | 558 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
1da177e4 LT |
559 | |
560 | acpi_bus_unregister_driver(&acpi_memory_device_driver); | |
561 | ||
d550d98d | 562 | return; |
1da177e4 LT |
563 | } |
564 | ||
565 | module_init(acpi_memory_device_init); | |
566 | module_exit(acpi_memory_device_exit); |