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 dev_dbg(pfru_dev->parent_dev,
132 "Query cap failed with no object\n");
133 return ret;
134 }
135
136 if (out_obj->package.count < CAP_NR_IDX ||
137 out_obj->package.elements[CAP_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
138 out_obj->package.elements[CAP_UPDATE_IDX].type != ACPI_TYPE_INTEGER ||
139 out_obj->package.elements[CAP_CODE_TYPE_IDX].type != ACPI_TYPE_BUFFER ||
140 out_obj->package.elements[CAP_FW_VER_IDX].type != ACPI_TYPE_INTEGER ||
141 out_obj->package.elements[CAP_CODE_RT_VER_IDX].type != ACPI_TYPE_INTEGER ||
142 out_obj->package.elements[CAP_DRV_TYPE_IDX].type != ACPI_TYPE_BUFFER ||
143 out_obj->package.elements[CAP_DRV_RT_VER_IDX].type != ACPI_TYPE_INTEGER ||
144 out_obj->package.elements[CAP_DRV_SVN_IDX].type != ACPI_TYPE_INTEGER ||
145 out_obj->package.elements[CAP_PLAT_ID_IDX].type != ACPI_TYPE_BUFFER ||
146 out_obj->package.elements[CAP_OEM_ID_IDX].type != ACPI_TYPE_BUFFER ||
147 out_obj->package.elements[CAP_OEM_INFO_IDX].type != ACPI_TYPE_BUFFER) {
148 dev_dbg(pfru_dev->parent_dev,
149 "Query cap failed with invalid package count/type\n");
150 goto free_acpi_buffer;
151 }
152
153 cap_hdr->status = out_obj->package.elements[CAP_STATUS_IDX].integer.value;
154 if (cap_hdr->status != DSM_SUCCEED) {
155 ret = -EBUSY;
156 dev_dbg(pfru_dev->parent_dev, "Query cap Error Status:%d\n",
157 cap_hdr->status);
158 goto free_acpi_buffer;
159 }
160
161 cap_hdr->update_cap = out_obj->package.elements[CAP_UPDATE_IDX].integer.value;
162 memcpy(&cap_hdr->code_type,
163 out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.pointer,
164 out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.length);
165 cap_hdr->fw_version =
166 out_obj->package.elements[CAP_FW_VER_IDX].integer.value;
167 cap_hdr->code_rt_version =
168 out_obj->package.elements[CAP_CODE_RT_VER_IDX].integer.value;
169 memcpy(&cap_hdr->drv_type,
170 out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.pointer,
171 out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.length);
172 cap_hdr->drv_rt_version =
173 out_obj->package.elements[CAP_DRV_RT_VER_IDX].integer.value;
174 cap_hdr->drv_svn =
175 out_obj->package.elements[CAP_DRV_SVN_IDX].integer.value;
176 memcpy(&cap_hdr->platform_id,
177 out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.pointer,
178 out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.length);
179 memcpy(&cap_hdr->oem_id,
180 out_obj->package.elements[CAP_OEM_ID_IDX].buffer.pointer,
181 out_obj->package.elements[CAP_OEM_ID_IDX].buffer.length);
182 cap_hdr->oem_info_len =
183 out_obj->package.elements[CAP_OEM_INFO_IDX].buffer.length;
184
185 ret = 0;
186
187 free_acpi_buffer:
188 ACPI_FREE(out_obj);
189
190 return ret;
191 }
192
query_buffer(struct pfru_com_buf_info * info,struct pfru_device * pfru_dev)193 static int query_buffer(struct pfru_com_buf_info *info,
194 struct pfru_device *pfru_dev)
195 {
196 acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
197 union acpi_object *out_obj;
198 int ret = -EINVAL;
199
200 out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
201 pfru_dev->rev_id, PFRU_FUNC_QUERY_BUF,
202 NULL, ACPI_TYPE_PACKAGE);
203 if (!out_obj) {
204 dev_dbg(pfru_dev->parent_dev,
205 "Query buf failed with no object\n");
206 return ret;
207 }
208
209 if (out_obj->package.count < BUF_NR_IDX ||
210 out_obj->package.elements[BUF_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
211 out_obj->package.elements[BUF_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
212 out_obj->package.elements[BUF_ADDR_LOW_IDX].type != ACPI_TYPE_INTEGER ||
213 out_obj->package.elements[BUF_ADDR_HI_IDX].type != ACPI_TYPE_INTEGER ||
214 out_obj->package.elements[BUF_SIZE_IDX].type != ACPI_TYPE_INTEGER) {
215 dev_dbg(pfru_dev->parent_dev,
216 "Query buf failed with invalid package count/type\n");
217 goto free_acpi_buffer;
218 }
219
220 info->status = out_obj->package.elements[BUF_STATUS_IDX].integer.value;
221 info->ext_status =
222 out_obj->package.elements[BUF_EXT_STATUS_IDX].integer.value;
223 if (info->status != DSM_SUCCEED) {
224 ret = -EBUSY;
225 dev_dbg(pfru_dev->parent_dev,
226 "Query buf failed with Error Status:%d\n", info->status);
227 dev_dbg(pfru_dev->parent_dev,
228 "Query buf failed with Error Extended Status:%d\n", info->ext_status);
229
230 goto free_acpi_buffer;
231 }
232
233 info->addr_lo =
234 out_obj->package.elements[BUF_ADDR_LOW_IDX].integer.value;
235 info->addr_hi =
236 out_obj->package.elements[BUF_ADDR_HI_IDX].integer.value;
237 info->buf_size = out_obj->package.elements[BUF_SIZE_IDX].integer.value;
238
239 ret = 0;
240
241 free_acpi_buffer:
242 ACPI_FREE(out_obj);
243
244 return ret;
245 }
246
get_image_type(const struct efi_manage_capsule_image_header * img_hdr,struct pfru_device * pfru_dev)247 static int get_image_type(const struct efi_manage_capsule_image_header *img_hdr,
248 struct pfru_device *pfru_dev)
249 {
250 const efi_guid_t *image_type_id = &img_hdr->image_type_id;
251
252 /* check whether this is a code injection or driver update */
253 if (guid_equal(image_type_id, &pfru_code_inj_guid))
254 return PFRU_CODE_INJECT_TYPE;
255
256 if (guid_equal(image_type_id, &pfru_drv_update_guid))
257 return PFRU_DRIVER_UPDATE_TYPE;
258
259 return -EINVAL;
260 }
261
adjust_efi_size(const struct efi_manage_capsule_image_header * img_hdr,int size)262 static int adjust_efi_size(const struct efi_manage_capsule_image_header *img_hdr,
263 int size)
264 {
265 /*
266 * The (u64 hw_ins) was introduced in UEFI spec version 2,
267 * and (u64 capsule_support) was introduced in version 3.
268 * The size needs to be adjusted accordingly. That is to
269 * say, version 1 should subtract the size of hw_ins+capsule_support,
270 * and version 2 should sbstract the size of capsule_support.
271 */
272 size += sizeof(struct efi_manage_capsule_image_header);
273 switch (img_hdr->ver) {
274 case 1:
275 return size - 2 * sizeof(u64);
276
277 case 2:
278 return size - sizeof(u64);
279
280 default:
281 /* only support version 1 and 2 */
282 return -EINVAL;
283 }
284 }
285
applicable_image(const void * data,struct pfru_update_cap_info * cap,struct pfru_device * pfru_dev)286 static bool applicable_image(const void *data, struct pfru_update_cap_info *cap,
287 struct pfru_device *pfru_dev)
288 {
289 struct pfru_payload_hdr *payload_hdr;
290 const efi_capsule_header_t *cap_hdr = data;
291 const struct efi_manage_capsule_header *m_hdr;
292 const struct efi_manage_capsule_image_header *m_img_hdr;
293 const struct efi_image_auth *auth;
294 int type, size;
295
296 /*
297 * If the code in the capsule is older than the current
298 * firmware code, the update will be rejected by the firmware,
299 * so check the version of it upfront without engaging the
300 * Management Mode update mechanism which may be costly.
301 */
302 size = cap_hdr->headersize;
303 m_hdr = data + size;
304 /*
305 * Current data structure size plus variable array indicated
306 * by number of (emb_drv_cnt + payload_cnt)
307 */
308 size += offsetof(struct efi_manage_capsule_header, offset_list) +
309 (m_hdr->emb_drv_cnt + m_hdr->payload_cnt) * sizeof(u64);
310 m_img_hdr = data + size;
311
312 type = get_image_type(m_img_hdr, pfru_dev);
313 if (type < 0) {
314 dev_dbg(pfru_dev->parent_dev, "Invalid image type\n");
315 return false;
316 }
317
318 size = adjust_efi_size(m_img_hdr, size);
319 if (size < 0) {
320 dev_dbg(pfru_dev->parent_dev, "Invalid image size\n");
321 return false;
322 }
323
324 auth = data + size;
325 size += sizeof(u64) + auth->auth_info.hdr.len;
326 payload_hdr = (struct pfru_payload_hdr *)(data + size);
327
328 /* finally compare the version */
329 if (type == PFRU_CODE_INJECT_TYPE)
330 return payload_hdr->rt_ver >= cap->code_rt_version;
331
332 return payload_hdr->rt_ver >= cap->drv_rt_version;
333 }
334
print_update_debug_info(struct pfru_updated_result * result,struct pfru_device * pfru_dev)335 static void print_update_debug_info(struct pfru_updated_result *result,
336 struct pfru_device *pfru_dev)
337 {
338 dev_dbg(pfru_dev->parent_dev, "Update result:\n");
339 dev_dbg(pfru_dev->parent_dev, "Authentication Time Low:%lld\n",
340 result->low_auth_time);
341 dev_dbg(pfru_dev->parent_dev, "Authentication Time High:%lld\n",
342 result->high_auth_time);
343 dev_dbg(pfru_dev->parent_dev, "Execution Time Low:%lld\n",
344 result->low_exec_time);
345 dev_dbg(pfru_dev->parent_dev, "Execution Time High:%lld\n",
346 result->high_exec_time);
347 }
348
start_update(int action,struct pfru_device * pfru_dev)349 static int start_update(int action, struct pfru_device *pfru_dev)
350 {
351 union acpi_object *out_obj, in_obj, in_buf;
352 struct pfru_updated_result update_result;
353 acpi_handle handle;
354 int ret = -EINVAL;
355
356 memset(&in_obj, 0, sizeof(in_obj));
357 memset(&in_buf, 0, sizeof(in_buf));
358 in_obj.type = ACPI_TYPE_PACKAGE;
359 in_obj.package.count = 1;
360 in_obj.package.elements = &in_buf;
361 in_buf.type = ACPI_TYPE_INTEGER;
362 in_buf.integer.value = action;
363
364 handle = ACPI_HANDLE(pfru_dev->parent_dev);
365 out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
366 pfru_dev->rev_id, PFRU_FUNC_START,
367 &in_obj, ACPI_TYPE_PACKAGE);
368 if (!out_obj) {
369 dev_dbg(pfru_dev->parent_dev,
370 "Update failed to start with no object\n");
371 return ret;
372 }
373
374 if (out_obj->package.count < UPDATE_NR_IDX ||
375 out_obj->package.elements[UPDATE_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
376 out_obj->package.elements[UPDATE_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
377 out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
378 out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].type != ACPI_TYPE_INTEGER ||
379 out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
380 out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].type != ACPI_TYPE_INTEGER) {
381 dev_dbg(pfru_dev->parent_dev,
382 "Update failed with invalid package count/type\n");
383 goto free_acpi_buffer;
384 }
385
386 update_result.status =
387 out_obj->package.elements[UPDATE_STATUS_IDX].integer.value;
388 update_result.ext_status =
389 out_obj->package.elements[UPDATE_EXT_STATUS_IDX].integer.value;
390
391 if (update_result.status != DSM_SUCCEED) {
392 ret = -EBUSY;
393 dev_dbg(pfru_dev->parent_dev,
394 "Update failed with Error Status:%d\n", update_result.status);
395 dev_dbg(pfru_dev->parent_dev,
396 "Update failed with Error Extended Status:%d\n",
397 update_result.ext_status);
398
399 goto free_acpi_buffer;
400 }
401
402 update_result.low_auth_time =
403 out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].integer.value;
404 update_result.high_auth_time =
405 out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].integer.value;
406 update_result.low_exec_time =
407 out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].integer.value;
408 update_result.high_exec_time =
409 out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].integer.value;
410
411 print_update_debug_info(&update_result, pfru_dev);
412 ret = 0;
413
414 free_acpi_buffer:
415 ACPI_FREE(out_obj);
416
417 return ret;
418 }
419
pfru_ioctl(struct file * file,unsigned int cmd,unsigned long arg)420 static long pfru_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
421 {
422 struct pfru_update_cap_info cap_hdr;
423 struct pfru_device *pfru_dev = to_pfru_dev(file);
424 void __user *p = (void __user *)arg;
425 u32 rev;
426 int ret;
427
428 switch (cmd) {
429 case PFRU_IOC_QUERY_CAP:
430 ret = query_capability(&cap_hdr, pfru_dev);
431 if (ret)
432 return ret;
433
434 if (copy_to_user(p, &cap_hdr, sizeof(cap_hdr)))
435 return -EFAULT;
436
437 return 0;
438
439 case PFRU_IOC_SET_REV:
440 if (copy_from_user(&rev, p, sizeof(rev)))
441 return -EFAULT;
442
443 if (!pfru_valid_revid(rev))
444 return -EINVAL;
445
446 pfru_dev->rev_id = rev;
447
448 return 0;
449
450 case PFRU_IOC_STAGE:
451 return start_update(START_STAGE, pfru_dev);
452
453 case PFRU_IOC_ACTIVATE:
454 return start_update(START_ACTIVATE, pfru_dev);
455
456 case PFRU_IOC_STAGE_ACTIVATE:
457 return start_update(START_STAGE_ACTIVATE, pfru_dev);
458
459 default:
460 return -ENOTTY;
461 }
462 }
463
pfru_write(struct file * file,const char __user * buf,size_t len,loff_t * ppos)464 static ssize_t pfru_write(struct file *file, const char __user *buf,
465 size_t len, loff_t *ppos)
466 {
467 struct pfru_device *pfru_dev = to_pfru_dev(file);
468 struct pfru_update_cap_info cap;
469 struct pfru_com_buf_info buf_info;
470 phys_addr_t phy_addr;
471 struct iov_iter iter;
472 struct iovec iov;
473 char *buf_ptr;
474 int ret;
475
476 ret = query_buffer(&buf_info, pfru_dev);
477 if (ret)
478 return ret;
479
480 if (len > buf_info.buf_size) {
481 dev_dbg(pfru_dev->parent_dev, "Capsule image size too large\n");
482 return -EINVAL;
483 }
484
485 iov.iov_base = (void __user *)buf;
486 iov.iov_len = len;
487 iov_iter_init(&iter, ITER_SOURCE, &iov, 1, len);
488
489 /* map the communication buffer */
490 phy_addr = (phys_addr_t)((buf_info.addr_hi << 32) | buf_info.addr_lo);
491 buf_ptr = memremap(phy_addr, buf_info.buf_size, MEMREMAP_WB);
492 if (!buf_ptr) {
493 dev_dbg(pfru_dev->parent_dev, "Failed to remap the buffer\n");
494 return -ENOMEM;
495 }
496
497 if (!copy_from_iter_full(buf_ptr, len, &iter)) {
498 dev_dbg(pfru_dev->parent_dev,
499 "Failed to copy the data from the user space buffer\n");
500 ret = -EINVAL;
501 goto unmap;
502 }
503
504 /* check if the capsule header has a valid version number */
505 ret = query_capability(&cap, pfru_dev);
506 if (ret)
507 goto unmap;
508
509 if (!applicable_image(buf_ptr, &cap, pfru_dev))
510 ret = -EINVAL;
511
512 unmap:
513 memunmap(buf_ptr);
514
515 return ret ?: len;
516 }
517
518 static const struct file_operations acpi_pfru_fops = {
519 .owner = THIS_MODULE,
520 .write = pfru_write,
521 .unlocked_ioctl = pfru_ioctl,
522 .llseek = noop_llseek,
523 };
524
acpi_pfru_remove(struct platform_device * pdev)525 static void acpi_pfru_remove(struct platform_device *pdev)
526 {
527 struct pfru_device *pfru_dev = platform_get_drvdata(pdev);
528
529 misc_deregister(&pfru_dev->miscdev);
530 }
531
pfru_put_idx(void * data)532 static void pfru_put_idx(void *data)
533 {
534 struct pfru_device *pfru_dev = data;
535
536 ida_free(&pfru_ida, pfru_dev->index);
537 }
538
acpi_pfru_probe(struct platform_device * pdev)539 static int acpi_pfru_probe(struct platform_device *pdev)
540 {
541 acpi_handle handle = ACPI_HANDLE(&pdev->dev);
542 struct pfru_device *pfru_dev;
543 int ret;
544
545 if (!acpi_has_method(handle, "_DSM")) {
546 dev_dbg(&pdev->dev, "Missing _DSM\n");
547 return -ENODEV;
548 }
549
550 pfru_dev = devm_kzalloc(&pdev->dev, sizeof(*pfru_dev), GFP_KERNEL);
551 if (!pfru_dev)
552 return -ENOMEM;
553
554 ret = ida_alloc(&pfru_ida, GFP_KERNEL);
555 if (ret < 0)
556 return ret;
557
558 pfru_dev->index = ret;
559 ret = devm_add_action_or_reset(&pdev->dev, pfru_put_idx, pfru_dev);
560 if (ret)
561 return ret;
562
563 pfru_dev->rev_id = PFRU_DEFAULT_REV_ID;
564 pfru_dev->parent_dev = &pdev->dev;
565
566 pfru_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
567 pfru_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
568 "pfru%d", pfru_dev->index);
569 if (!pfru_dev->miscdev.name)
570 return -ENOMEM;
571
572 pfru_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL,
573 "acpi_pfr_update%d", pfru_dev->index);
574 if (!pfru_dev->miscdev.nodename)
575 return -ENOMEM;
576
577 pfru_dev->miscdev.fops = &acpi_pfru_fops;
578 pfru_dev->miscdev.parent = &pdev->dev;
579
580 ret = misc_register(&pfru_dev->miscdev);
581 if (ret)
582 return ret;
583
584 platform_set_drvdata(pdev, pfru_dev);
585
586 return 0;
587 }
588
589 static const struct acpi_device_id acpi_pfru_ids[] = {
590 {"INTC1080"},
591 {}
592 };
593 MODULE_DEVICE_TABLE(acpi, acpi_pfru_ids);
594
595 static struct platform_driver acpi_pfru_driver = {
596 .driver = {
597 .name = "pfr_update",
598 .acpi_match_table = acpi_pfru_ids,
599 },
600 .probe = acpi_pfru_probe,
601 .remove = acpi_pfru_remove,
602 };
603 module_platform_driver(acpi_pfru_driver);
604
605 MODULE_DESCRIPTION("Platform Firmware Runtime Update device driver");
606 MODULE_LICENSE("GPL v2");
607