1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ACPI Platform Firmware Runtime Update Device driver
4 *
5 * Copyright (C) 2021 Intel Corporation
6 * Author: Chen Yu <yu.c.chen@intel.com>
7 *
8 * pfr_update driver is used for Platform Firmware Runtime
9 * Update, which includes the code injection and driver update.
10 */
11 #include <linux/acpi.h>
12 #include <linux/device.h>
13 #include <linux/efi.h>
14 #include <linux/err.h>
15 #include <linux/errno.h>
16 #include <linux/file.h>
17 #include <linux/fs.h>
18 #include <linux/idr.h>
19 #include <linux/miscdevice.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
22 #include <linux/string.h>
23 #include <linux/uaccess.h>
24 #include <linux/uio.h>
25 #include <linux/uuid.h>
26
27 #include <uapi/linux/pfrut.h>
28
29 #define PFRU_FUNC_STANDARD_QUERY 0
30 #define PFRU_FUNC_QUERY_UPDATE_CAP 1
31 #define PFRU_FUNC_QUERY_BUF 2
32 #define PFRU_FUNC_START 3
33
34 #define PFRU_CODE_INJECT_TYPE 1
35 #define PFRU_DRIVER_UPDATE_TYPE 2
36
37 #define PFRU_REVID_1 1
38 #define PFRU_REVID_2 2
39 #define PFRU_DEFAULT_REV_ID PFRU_REVID_1
40
41 enum cap_index {
42 CAP_STATUS_IDX = 0,
43 CAP_UPDATE_IDX = 1,
44 CAP_CODE_TYPE_IDX = 2,
45 CAP_FW_VER_IDX = 3,
46 CAP_CODE_RT_VER_IDX = 4,
47 CAP_DRV_TYPE_IDX = 5,
48 CAP_DRV_RT_VER_IDX = 6,
49 CAP_DRV_SVN_IDX = 7,
50 CAP_PLAT_ID_IDX = 8,
51 CAP_OEM_ID_IDX = 9,
52 CAP_OEM_INFO_IDX = 10,
53 CAP_NR_IDX
54 };
55
56 enum buf_index {
57 BUF_STATUS_IDX = 0,
58 BUF_EXT_STATUS_IDX = 1,
59 BUF_ADDR_LOW_IDX = 2,
60 BUF_ADDR_HI_IDX = 3,
61 BUF_SIZE_IDX = 4,
62 BUF_NR_IDX
63 };
64
65 enum update_index {
66 UPDATE_STATUS_IDX = 0,
67 UPDATE_EXT_STATUS_IDX = 1,
68 UPDATE_AUTH_TIME_LOW_IDX = 2,
69 UPDATE_AUTH_TIME_HI_IDX = 3,
70 UPDATE_EXEC_TIME_LOW_IDX = 4,
71 UPDATE_EXEC_TIME_HI_IDX = 5,
72 UPDATE_NR_IDX
73 };
74
75 enum pfru_start_action {
76 START_STAGE = 0,
77 START_ACTIVATE = 1,
78 START_STAGE_ACTIVATE = 2,
79 };
80
81 struct pfru_device {
82 u32 rev_id, index;
83 struct device *parent_dev;
84 struct miscdevice miscdev;
85 };
86
87 static DEFINE_IDA(pfru_ida);
88
89 /*
90 * Manual reference:
91 * https://uefi.org/sites/default/files/resources/Intel_MM_OS_Interface_Spec_Rev100.pdf
92 *
93 * pfru_guid is the parameter for _DSM method
94 */
95 static const guid_t pfru_guid =
96 GUID_INIT(0xECF9533B, 0x4A3C, 0x4E89, 0x93, 0x9E, 0xC7, 0x71,
97 0x12, 0x60, 0x1C, 0x6D);
98
99 /* pfru_code_inj_guid is the UUID to identify code injection EFI capsule file */
100 static const guid_t pfru_code_inj_guid =
101 GUID_INIT(0xB2F84B79, 0x7B6E, 0x4E45, 0x88, 0x5F, 0x3F, 0xB9,
102 0xBB, 0x18, 0x54, 0x02);
103
104 /* pfru_drv_update_guid is the UUID to identify driver update EFI capsule file */
105 static const guid_t pfru_drv_update_guid =
106 GUID_INIT(0x4569DD8C, 0x75F1, 0x429A, 0xA3, 0xD6, 0x24, 0xDE,
107 0x80, 0x97, 0xA0, 0xDF);
108
pfru_valid_revid(u32 id)109 static inline int pfru_valid_revid(u32 id)
110 {
111 return id == PFRU_REVID_1 || id == PFRU_REVID_2;
112 }
113
to_pfru_dev(struct file * file)114 static inline struct pfru_device *to_pfru_dev(struct file *file)
115 {
116 return container_of(file->private_data, struct pfru_device, miscdev);
117 }
118
query_capability(struct pfru_update_cap_info * cap_hdr,struct pfru_device * pfru_dev)119 static int query_capability(struct pfru_update_cap_info *cap_hdr,
120 struct pfru_device *pfru_dev)
121 {
122 acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
123 union acpi_object *out_obj;
124 int ret = -EINVAL;
125
126 out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
127 pfru_dev->rev_id,
128 PFRU_FUNC_QUERY_UPDATE_CAP,
129 NULL, ACPI_TYPE_PACKAGE);
130 if (!out_obj)
131 return ret;
132
133 if (out_obj->package.count < CAP_NR_IDX ||
134 out_obj->package.elements[CAP_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
135 out_obj->package.elements[CAP_UPDATE_IDX].type != ACPI_TYPE_INTEGER ||
136 out_obj->package.elements[CAP_CODE_TYPE_IDX].type != ACPI_TYPE_BUFFER ||
137 out_obj->package.elements[CAP_FW_VER_IDX].type != ACPI_TYPE_INTEGER ||
138 out_obj->package.elements[CAP_CODE_RT_VER_IDX].type != ACPI_TYPE_INTEGER ||
139 out_obj->package.elements[CAP_DRV_TYPE_IDX].type != ACPI_TYPE_BUFFER ||
140 out_obj->package.elements[CAP_DRV_RT_VER_IDX].type != ACPI_TYPE_INTEGER ||
141 out_obj->package.elements[CAP_DRV_SVN_IDX].type != ACPI_TYPE_INTEGER ||
142 out_obj->package.elements[CAP_PLAT_ID_IDX].type != ACPI_TYPE_BUFFER ||
143 out_obj->package.elements[CAP_OEM_ID_IDX].type != ACPI_TYPE_BUFFER ||
144 out_obj->package.elements[CAP_OEM_INFO_IDX].type != ACPI_TYPE_BUFFER)
145 goto free_acpi_buffer;
146
147 cap_hdr->status = out_obj->package.elements[CAP_STATUS_IDX].integer.value;
148 if (cap_hdr->status != DSM_SUCCEED) {
149 ret = -EBUSY;
150 dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", cap_hdr->status);
151 goto free_acpi_buffer;
152 }
153
154 cap_hdr->update_cap = out_obj->package.elements[CAP_UPDATE_IDX].integer.value;
155 memcpy(&cap_hdr->code_type,
156 out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.pointer,
157 out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.length);
158 cap_hdr->fw_version =
159 out_obj->package.elements[CAP_FW_VER_IDX].integer.value;
160 cap_hdr->code_rt_version =
161 out_obj->package.elements[CAP_CODE_RT_VER_IDX].integer.value;
162 memcpy(&cap_hdr->drv_type,
163 out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.pointer,
164 out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.length);
165 cap_hdr->drv_rt_version =
166 out_obj->package.elements[CAP_DRV_RT_VER_IDX].integer.value;
167 cap_hdr->drv_svn =
168 out_obj->package.elements[CAP_DRV_SVN_IDX].integer.value;
169 memcpy(&cap_hdr->platform_id,
170 out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.pointer,
171 out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.length);
172 memcpy(&cap_hdr->oem_id,
173 out_obj->package.elements[CAP_OEM_ID_IDX].buffer.pointer,
174 out_obj->package.elements[CAP_OEM_ID_IDX].buffer.length);
175 cap_hdr->oem_info_len =
176 out_obj->package.elements[CAP_OEM_INFO_IDX].buffer.length;
177
178 ret = 0;
179
180 free_acpi_buffer:
181 ACPI_FREE(out_obj);
182
183 return ret;
184 }
185
query_buffer(struct pfru_com_buf_info * info,struct pfru_device * pfru_dev)186 static int query_buffer(struct pfru_com_buf_info *info,
187 struct pfru_device *pfru_dev)
188 {
189 acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
190 union acpi_object *out_obj;
191 int ret = -EINVAL;
192
193 out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
194 pfru_dev->rev_id, PFRU_FUNC_QUERY_BUF,
195 NULL, ACPI_TYPE_PACKAGE);
196 if (!out_obj)
197 return ret;
198
199 if (out_obj->package.count < BUF_NR_IDX ||
200 out_obj->package.elements[BUF_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
201 out_obj->package.elements[BUF_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
202 out_obj->package.elements[BUF_ADDR_LOW_IDX].type != ACPI_TYPE_INTEGER ||
203 out_obj->package.elements[BUF_ADDR_HI_IDX].type != ACPI_TYPE_INTEGER ||
204 out_obj->package.elements[BUF_SIZE_IDX].type != ACPI_TYPE_INTEGER)
205 goto free_acpi_buffer;
206
207 info->status = out_obj->package.elements[BUF_STATUS_IDX].integer.value;
208 info->ext_status =
209 out_obj->package.elements[BUF_EXT_STATUS_IDX].integer.value;
210 if (info->status != DSM_SUCCEED) {
211 ret = -EBUSY;
212 dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", info->status);
213 dev_dbg(pfru_dev->parent_dev, "Error Extended Status:%d\n", info->ext_status);
214
215 goto free_acpi_buffer;
216 }
217
218 info->addr_lo =
219 out_obj->package.elements[BUF_ADDR_LOW_IDX].integer.value;
220 info->addr_hi =
221 out_obj->package.elements[BUF_ADDR_HI_IDX].integer.value;
222 info->buf_size = out_obj->package.elements[BUF_SIZE_IDX].integer.value;
223
224 ret = 0;
225
226 free_acpi_buffer:
227 ACPI_FREE(out_obj);
228
229 return ret;
230 }
231
get_image_type(const struct efi_manage_capsule_image_header * img_hdr,struct pfru_device * pfru_dev)232 static int get_image_type(const struct efi_manage_capsule_image_header *img_hdr,
233 struct pfru_device *pfru_dev)
234 {
235 const efi_guid_t *image_type_id = &img_hdr->image_type_id;
236
237 /* check whether this is a code injection or driver update */
238 if (guid_equal(image_type_id, &pfru_code_inj_guid))
239 return PFRU_CODE_INJECT_TYPE;
240
241 if (guid_equal(image_type_id, &pfru_drv_update_guid))
242 return PFRU_DRIVER_UPDATE_TYPE;
243
244 return -EINVAL;
245 }
246
adjust_efi_size(const struct efi_manage_capsule_image_header * img_hdr,int size)247 static int adjust_efi_size(const struct efi_manage_capsule_image_header *img_hdr,
248 int size)
249 {
250 /*
251 * The (u64 hw_ins) was introduced in UEFI spec version 2,
252 * and (u64 capsule_support) was introduced in version 3.
253 * The size needs to be adjusted accordingly. That is to
254 * say, version 1 should subtract the size of hw_ins+capsule_support,
255 * and version 2 should sbstract the size of capsule_support.
256 */
257 size += sizeof(struct efi_manage_capsule_image_header);
258 switch (img_hdr->ver) {
259 case 1:
260 return size - 2 * sizeof(u64);
261
262 case 2:
263 return size - sizeof(u64);
264
265 default:
266 /* only support version 1 and 2 */
267 return -EINVAL;
268 }
269 }
270
applicable_image(const void * data,struct pfru_update_cap_info * cap,struct pfru_device * pfru_dev)271 static bool applicable_image(const void *data, struct pfru_update_cap_info *cap,
272 struct pfru_device *pfru_dev)
273 {
274 struct pfru_payload_hdr *payload_hdr;
275 const efi_capsule_header_t *cap_hdr = data;
276 const struct efi_manage_capsule_header *m_hdr;
277 const struct efi_manage_capsule_image_header *m_img_hdr;
278 const struct efi_image_auth *auth;
279 int type, size;
280
281 /*
282 * If the code in the capsule is older than the current
283 * firmware code, the update will be rejected by the firmware,
284 * so check the version of it upfront without engaging the
285 * Management Mode update mechanism which may be costly.
286 */
287 size = cap_hdr->headersize;
288 m_hdr = data + size;
289 /*
290 * Current data structure size plus variable array indicated
291 * by number of (emb_drv_cnt + payload_cnt)
292 */
293 size += offsetof(struct efi_manage_capsule_header, offset_list) +
294 (m_hdr->emb_drv_cnt + m_hdr->payload_cnt) * sizeof(u64);
295 m_img_hdr = data + size;
296
297 type = get_image_type(m_img_hdr, pfru_dev);
298 if (type < 0)
299 return false;
300
301 size = adjust_efi_size(m_img_hdr, size);
302 if (size < 0)
303 return false;
304
305 auth = data + size;
306 size += sizeof(u64) + auth->auth_info.hdr.len;
307 payload_hdr = (struct pfru_payload_hdr *)(data + size);
308
309 /* finally compare the version */
310 if (type == PFRU_CODE_INJECT_TYPE)
311 return payload_hdr->rt_ver >= cap->code_rt_version;
312
313 return payload_hdr->rt_ver >= cap->drv_rt_version;
314 }
315
print_update_debug_info(struct pfru_updated_result * result,struct pfru_device * pfru_dev)316 static void print_update_debug_info(struct pfru_updated_result *result,
317 struct pfru_device *pfru_dev)
318 {
319 dev_dbg(pfru_dev->parent_dev, "Update result:\n");
320 dev_dbg(pfru_dev->parent_dev, "Authentication Time Low:%lld\n",
321 result->low_auth_time);
322 dev_dbg(pfru_dev->parent_dev, "Authentication Time High:%lld\n",
323 result->high_auth_time);
324 dev_dbg(pfru_dev->parent_dev, "Execution Time Low:%lld\n",
325 result->low_exec_time);
326 dev_dbg(pfru_dev->parent_dev, "Execution Time High:%lld\n",
327 result->high_exec_time);
328 }
329
start_update(int action,struct pfru_device * pfru_dev)330 static int start_update(int action, struct pfru_device *pfru_dev)
331 {
332 union acpi_object *out_obj, in_obj, in_buf;
333 struct pfru_updated_result update_result;
334 acpi_handle handle;
335 int ret = -EINVAL;
336
337 memset(&in_obj, 0, sizeof(in_obj));
338 memset(&in_buf, 0, sizeof(in_buf));
339 in_obj.type = ACPI_TYPE_PACKAGE;
340 in_obj.package.count = 1;
341 in_obj.package.elements = &in_buf;
342 in_buf.type = ACPI_TYPE_INTEGER;
343 in_buf.integer.value = action;
344
345 handle = ACPI_HANDLE(pfru_dev->parent_dev);
346 out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
347 pfru_dev->rev_id, PFRU_FUNC_START,
348 &in_obj, ACPI_TYPE_PACKAGE);
349 if (!out_obj)
350 return ret;
351
352 if (out_obj->package.count < UPDATE_NR_IDX ||
353 out_obj->package.elements[UPDATE_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
354 out_obj->package.elements[UPDATE_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
355 out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
356 out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].type != ACPI_TYPE_INTEGER ||
357 out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
358 out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].type != ACPI_TYPE_INTEGER)
359 goto free_acpi_buffer;
360
361 update_result.status =
362 out_obj->package.elements[UPDATE_STATUS_IDX].integer.value;
363 update_result.ext_status =
364 out_obj->package.elements[UPDATE_EXT_STATUS_IDX].integer.value;
365
366 if (update_result.status != DSM_SUCCEED) {
367 ret = -EBUSY;
368 dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", update_result.status);
369 dev_dbg(pfru_dev->parent_dev, "Error Extended Status:%d\n",
370 update_result.ext_status);
371
372 goto free_acpi_buffer;
373 }
374
375 update_result.low_auth_time =
376 out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].integer.value;
377 update_result.high_auth_time =
378 out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].integer.value;
379 update_result.low_exec_time =
380 out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].integer.value;
381 update_result.high_exec_time =
382 out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].integer.value;
383
384 print_update_debug_info(&update_result, pfru_dev);
385 ret = 0;
386
387 free_acpi_buffer:
388 ACPI_FREE(out_obj);
389
390 return ret;
391 }
392
pfru_ioctl(struct file * file,unsigned int cmd,unsigned long arg)393 static long pfru_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
394 {
395 struct pfru_update_cap_info cap_hdr;
396 struct pfru_device *pfru_dev = to_pfru_dev(file);
397 void __user *p = (void __user *)arg;
398 u32 rev;
399 int ret;
400
401 switch (cmd) {
402 case PFRU_IOC_QUERY_CAP:
403 ret = query_capability(&cap_hdr, pfru_dev);
404 if (ret)
405 return ret;
406
407 if (copy_to_user(p, &cap_hdr, sizeof(cap_hdr)))
408 return -EFAULT;
409
410 return 0;
411
412 case PFRU_IOC_SET_REV:
413 if (copy_from_user(&rev, p, sizeof(rev)))
414 return -EFAULT;
415
416 if (!pfru_valid_revid(rev))
417 return -EINVAL;
418
419 pfru_dev->rev_id = rev;
420
421 return 0;
422
423 case PFRU_IOC_STAGE:
424 return start_update(START_STAGE, pfru_dev);
425
426 case PFRU_IOC_ACTIVATE:
427 return start_update(START_ACTIVATE, pfru_dev);
428
429 case PFRU_IOC_STAGE_ACTIVATE:
430 return start_update(START_STAGE_ACTIVATE, pfru_dev);
431
432 default:
433 return -ENOTTY;
434 }
435 }
436
pfru_write(struct file * file,const char __user * buf,size_t len,loff_t * ppos)437 static ssize_t pfru_write(struct file *file, const char __user *buf,
438 size_t len, loff_t *ppos)
439 {
440 struct pfru_device *pfru_dev = to_pfru_dev(file);
441 struct pfru_update_cap_info cap;
442 struct pfru_com_buf_info buf_info;
443 phys_addr_t phy_addr;
444 struct iov_iter iter;
445 struct iovec iov;
446 char *buf_ptr;
447 int ret;
448
449 ret = query_buffer(&buf_info, pfru_dev);
450 if (ret)
451 return ret;
452
453 if (len > buf_info.buf_size)
454 return -EINVAL;
455
456 iov.iov_base = (void __user *)buf;
457 iov.iov_len = len;
458 iov_iter_init(&iter, ITER_SOURCE, &iov, 1, len);
459
460 /* map the communication buffer */
461 phy_addr = (phys_addr_t)((buf_info.addr_hi << 32) | buf_info.addr_lo);
462 buf_ptr = memremap(phy_addr, buf_info.buf_size, MEMREMAP_WB);
463 if (!buf_ptr)
464 return -ENOMEM;
465
466 if (!copy_from_iter_full(buf_ptr, len, &iter)) {
467 ret = -EINVAL;
468 goto unmap;
469 }
470
471 /* check if the capsule header has a valid version number */
472 ret = query_capability(&cap, pfru_dev);
473 if (ret)
474 goto unmap;
475
476 if (!applicable_image(buf_ptr, &cap, pfru_dev))
477 ret = -EINVAL;
478
479 unmap:
480 memunmap(buf_ptr);
481
482 return ret ?: len;
483 }
484
485 static const struct file_operations acpi_pfru_fops = {
486 .owner = THIS_MODULE,
487 .write = pfru_write,
488 .unlocked_ioctl = pfru_ioctl,
489 .llseek = noop_llseek,
490 };
491
acpi_pfru_remove(struct platform_device * pdev)492 static int acpi_pfru_remove(struct platform_device *pdev)
493 {
494 struct pfru_device *pfru_dev = platform_get_drvdata(pdev);
495
496 misc_deregister(&pfru_dev->miscdev);
497
498 return 0;
499 }
500
pfru_put_idx(void * data)501 static void pfru_put_idx(void *data)
502 {
503 struct pfru_device *pfru_dev = data;
504
505 ida_free(&pfru_ida, pfru_dev->index);
506 }
507
acpi_pfru_probe(struct platform_device * pdev)508 static int acpi_pfru_probe(struct platform_device *pdev)
509 {
510 acpi_handle handle = ACPI_HANDLE(&pdev->dev);
511 struct pfru_device *pfru_dev;
512 int ret;
513
514 if (!acpi_has_method(handle, "_DSM")) {
515 dev_dbg(&pdev->dev, "Missing _DSM\n");
516 return -ENODEV;
517 }
518
519 pfru_dev = devm_kzalloc(&pdev->dev, sizeof(*pfru_dev), GFP_KERNEL);
520 if (!pfru_dev)
521 return -ENOMEM;
522
523 ret = ida_alloc(&pfru_ida, GFP_KERNEL);
524 if (ret < 0)
525 return ret;
526
527 pfru_dev->index = ret;
528 ret = devm_add_action_or_reset(&pdev->dev, pfru_put_idx, pfru_dev);
529 if (ret)
530 return ret;
531
532 pfru_dev->rev_id = PFRU_DEFAULT_REV_ID;
533 pfru_dev->parent_dev = &pdev->dev;
534
535 pfru_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
536 pfru_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
537 "pfru%d", pfru_dev->index);
538 if (!pfru_dev->miscdev.name)
539 return -ENOMEM;
540
541 pfru_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL,
542 "acpi_pfr_update%d", pfru_dev->index);
543 if (!pfru_dev->miscdev.nodename)
544 return -ENOMEM;
545
546 pfru_dev->miscdev.fops = &acpi_pfru_fops;
547 pfru_dev->miscdev.parent = &pdev->dev;
548
549 ret = misc_register(&pfru_dev->miscdev);
550 if (ret)
551 return ret;
552
553 platform_set_drvdata(pdev, pfru_dev);
554
555 return 0;
556 }
557
558 static const struct acpi_device_id acpi_pfru_ids[] = {
559 {"INTC1080"},
560 {}
561 };
562 MODULE_DEVICE_TABLE(acpi, acpi_pfru_ids);
563
564 static struct platform_driver acpi_pfru_driver = {
565 .driver = {
566 .name = "pfr_update",
567 .acpi_match_table = acpi_pfru_ids,
568 },
569 .probe = acpi_pfru_probe,
570 .remove = acpi_pfru_remove,
571 };
572 module_platform_driver(acpi_pfru_driver);
573
574 MODULE_DESCRIPTION("Platform Firmware Runtime Update device driver");
575 MODULE_LICENSE("GPL v2");
576