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, *elem;
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 elem = out_obj->package.elements;
154
155 cap_hdr->status = elem[CAP_STATUS_IDX].integer.value;
156 if (cap_hdr->status != DSM_SUCCEED) {
157 ret = -EBUSY;
158 dev_dbg(pfru_dev->parent_dev, "Query cap Error Status:%d\n",
159 cap_hdr->status);
160 goto free_acpi_buffer;
161 }
162
163 if (elem[CAP_CODE_TYPE_IDX].buffer.length > sizeof(cap_hdr->code_type) ||
164 elem[CAP_DRV_TYPE_IDX].buffer.length > sizeof(cap_hdr->drv_type) ||
165 elem[CAP_PLAT_ID_IDX].buffer.length > sizeof(cap_hdr->platform_id) ||
166 elem[CAP_OEM_ID_IDX].buffer.length > sizeof(cap_hdr->oem_id))
167 goto free_acpi_buffer;
168
169 cap_hdr->update_cap = elem[CAP_UPDATE_IDX].integer.value;
170 memcpy(&cap_hdr->code_type,
171 elem[CAP_CODE_TYPE_IDX].buffer.pointer,
172 elem[CAP_CODE_TYPE_IDX].buffer.length);
173 cap_hdr->fw_version = elem[CAP_FW_VER_IDX].integer.value;
174 cap_hdr->code_rt_version = elem[CAP_CODE_RT_VER_IDX].integer.value;
175 memcpy(&cap_hdr->drv_type,
176 elem[CAP_DRV_TYPE_IDX].buffer.pointer,
177 elem[CAP_DRV_TYPE_IDX].buffer.length);
178 cap_hdr->drv_rt_version = elem[CAP_DRV_RT_VER_IDX].integer.value;
179 cap_hdr->drv_svn = elem[CAP_DRV_SVN_IDX].integer.value;
180 memcpy(&cap_hdr->platform_id,
181 elem[CAP_PLAT_ID_IDX].buffer.pointer,
182 elem[CAP_PLAT_ID_IDX].buffer.length);
183 memcpy(&cap_hdr->oem_id,
184 elem[CAP_OEM_ID_IDX].buffer.pointer,
185 elem[CAP_OEM_ID_IDX].buffer.length);
186 cap_hdr->oem_info_len = elem[CAP_OEM_INFO_IDX].buffer.length;
187
188 ret = 0;
189
190 free_acpi_buffer:
191 ACPI_FREE(out_obj);
192
193 return ret;
194 }
195
query_buffer(struct pfru_com_buf_info * info,struct pfru_device * pfru_dev)196 static int query_buffer(struct pfru_com_buf_info *info,
197 struct pfru_device *pfru_dev)
198 {
199 acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
200 union acpi_object *out_obj;
201 int ret = -EINVAL;
202
203 out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
204 pfru_dev->rev_id, PFRU_FUNC_QUERY_BUF,
205 NULL, ACPI_TYPE_PACKAGE);
206 if (!out_obj) {
207 dev_dbg(pfru_dev->parent_dev,
208 "Query buf failed with no object\n");
209 return ret;
210 }
211
212 if (out_obj->package.count < BUF_NR_IDX ||
213 out_obj->package.elements[BUF_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
214 out_obj->package.elements[BUF_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
215 out_obj->package.elements[BUF_ADDR_LOW_IDX].type != ACPI_TYPE_INTEGER ||
216 out_obj->package.elements[BUF_ADDR_HI_IDX].type != ACPI_TYPE_INTEGER ||
217 out_obj->package.elements[BUF_SIZE_IDX].type != ACPI_TYPE_INTEGER) {
218 dev_dbg(pfru_dev->parent_dev,
219 "Query buf failed with invalid package count/type\n");
220 goto free_acpi_buffer;
221 }
222
223 info->status = out_obj->package.elements[BUF_STATUS_IDX].integer.value;
224 info->ext_status =
225 out_obj->package.elements[BUF_EXT_STATUS_IDX].integer.value;
226 if (info->status != DSM_SUCCEED) {
227 ret = -EBUSY;
228 dev_dbg(pfru_dev->parent_dev,
229 "Query buf failed with Error Status:%d\n", info->status);
230 dev_dbg(pfru_dev->parent_dev,
231 "Query buf failed with Error Extended Status:%d\n", info->ext_status);
232
233 goto free_acpi_buffer;
234 }
235
236 info->addr_lo =
237 out_obj->package.elements[BUF_ADDR_LOW_IDX].integer.value;
238 info->addr_hi =
239 out_obj->package.elements[BUF_ADDR_HI_IDX].integer.value;
240 info->buf_size = out_obj->package.elements[BUF_SIZE_IDX].integer.value;
241
242 ret = 0;
243
244 free_acpi_buffer:
245 ACPI_FREE(out_obj);
246
247 return ret;
248 }
249
get_image_type(const struct efi_manage_capsule_image_header * img_hdr,struct pfru_device * pfru_dev)250 static int get_image_type(const struct efi_manage_capsule_image_header *img_hdr,
251 struct pfru_device *pfru_dev)
252 {
253 const efi_guid_t *image_type_id = &img_hdr->image_type_id;
254
255 /* check whether this is a code injection or driver update */
256 if (guid_equal(image_type_id, &pfru_code_inj_guid))
257 return PFRU_CODE_INJECT_TYPE;
258
259 if (guid_equal(image_type_id, &pfru_drv_update_guid))
260 return PFRU_DRIVER_UPDATE_TYPE;
261
262 return -EINVAL;
263 }
264
adjust_efi_size(const struct efi_manage_capsule_image_header * img_hdr,int size)265 static int adjust_efi_size(const struct efi_manage_capsule_image_header *img_hdr,
266 int size)
267 {
268 /*
269 * The (u64 hw_ins) was introduced in UEFI spec version 2,
270 * and (u64 capsule_support) was introduced in version 3.
271 * The size needs to be adjusted accordingly. That is to
272 * say, version 1 should subtract the size of hw_ins+capsule_support,
273 * and version 2 should sbstract the size of capsule_support.
274 */
275 size += sizeof(struct efi_manage_capsule_image_header);
276 switch (img_hdr->ver) {
277 case 1:
278 return size - 2 * sizeof(u64);
279
280 case 2:
281 return size - sizeof(u64);
282
283 default:
284 /* only support version 1 and 2 */
285 return -EINVAL;
286 }
287 }
288
applicable_image(const void * data,struct pfru_update_cap_info * cap,struct pfru_device * pfru_dev)289 static bool applicable_image(const void *data, struct pfru_update_cap_info *cap,
290 struct pfru_device *pfru_dev)
291 {
292 struct pfru_payload_hdr *payload_hdr;
293 const efi_capsule_header_t *cap_hdr = data;
294 const struct efi_manage_capsule_header *m_hdr;
295 const struct efi_manage_capsule_image_header *m_img_hdr;
296 const struct efi_image_auth *auth;
297 int type, size;
298
299 /*
300 * If the code in the capsule is older than the current
301 * firmware code, the update will be rejected by the firmware,
302 * so check the version of it upfront without engaging the
303 * Management Mode update mechanism which may be costly.
304 */
305 size = cap_hdr->headersize;
306 m_hdr = data + size;
307 /*
308 * Current data structure size plus variable array indicated
309 * by number of (emb_drv_cnt + payload_cnt)
310 */
311 size += offsetof(struct efi_manage_capsule_header, offset_list) +
312 (m_hdr->emb_drv_cnt + m_hdr->payload_cnt) * sizeof(u64);
313 m_img_hdr = data + size;
314
315 type = get_image_type(m_img_hdr, pfru_dev);
316 if (type < 0) {
317 dev_dbg(pfru_dev->parent_dev, "Invalid image type\n");
318 return false;
319 }
320
321 size = adjust_efi_size(m_img_hdr, size);
322 if (size < 0) {
323 dev_dbg(pfru_dev->parent_dev, "Invalid image size\n");
324 return false;
325 }
326
327 auth = data + size;
328 size += sizeof(u64) + auth->auth_info.hdr.len;
329 payload_hdr = (struct pfru_payload_hdr *)(data + size);
330
331 /* finally compare the version */
332 if (type == PFRU_CODE_INJECT_TYPE)
333 return payload_hdr->rt_ver >= cap->code_rt_version;
334
335 return payload_hdr->svn_ver >= cap->drv_svn;
336 }
337
print_update_debug_info(struct pfru_updated_result * result,struct pfru_device * pfru_dev)338 static void print_update_debug_info(struct pfru_updated_result *result,
339 struct pfru_device *pfru_dev)
340 {
341 dev_dbg(pfru_dev->parent_dev, "Update result:\n");
342 dev_dbg(pfru_dev->parent_dev, "Authentication Time Low:%lld\n",
343 result->low_auth_time);
344 dev_dbg(pfru_dev->parent_dev, "Authentication Time High:%lld\n",
345 result->high_auth_time);
346 dev_dbg(pfru_dev->parent_dev, "Execution Time Low:%lld\n",
347 result->low_exec_time);
348 dev_dbg(pfru_dev->parent_dev, "Execution Time High:%lld\n",
349 result->high_exec_time);
350 }
351
start_update(int action,struct pfru_device * pfru_dev)352 static int start_update(int action, struct pfru_device *pfru_dev)
353 {
354 union acpi_object *out_obj, in_obj, in_buf;
355 struct pfru_updated_result update_result;
356 acpi_handle handle;
357 int ret = -EINVAL;
358
359 memset(&in_obj, 0, sizeof(in_obj));
360 memset(&in_buf, 0, sizeof(in_buf));
361 in_obj.type = ACPI_TYPE_PACKAGE;
362 in_obj.package.count = 1;
363 in_obj.package.elements = &in_buf;
364 in_buf.type = ACPI_TYPE_INTEGER;
365 in_buf.integer.value = action;
366
367 handle = ACPI_HANDLE(pfru_dev->parent_dev);
368 out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
369 pfru_dev->rev_id, PFRU_FUNC_START,
370 &in_obj, ACPI_TYPE_PACKAGE);
371 if (!out_obj) {
372 dev_dbg(pfru_dev->parent_dev,
373 "Update failed to start with no object\n");
374 return ret;
375 }
376
377 if (out_obj->package.count < UPDATE_NR_IDX ||
378 out_obj->package.elements[UPDATE_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
379 out_obj->package.elements[UPDATE_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
380 out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
381 out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].type != ACPI_TYPE_INTEGER ||
382 out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
383 out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].type != ACPI_TYPE_INTEGER) {
384 dev_dbg(pfru_dev->parent_dev,
385 "Update failed with invalid package count/type\n");
386 goto free_acpi_buffer;
387 }
388
389 update_result.status =
390 out_obj->package.elements[UPDATE_STATUS_IDX].integer.value;
391 update_result.ext_status =
392 out_obj->package.elements[UPDATE_EXT_STATUS_IDX].integer.value;
393
394 if (update_result.status != DSM_SUCCEED) {
395 ret = -EBUSY;
396 dev_dbg(pfru_dev->parent_dev,
397 "Update failed with Error Status:%d\n", update_result.status);
398 dev_dbg(pfru_dev->parent_dev,
399 "Update failed with Error Extended Status:%d\n",
400 update_result.ext_status);
401
402 goto free_acpi_buffer;
403 }
404
405 update_result.low_auth_time =
406 out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].integer.value;
407 update_result.high_auth_time =
408 out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].integer.value;
409 update_result.low_exec_time =
410 out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].integer.value;
411 update_result.high_exec_time =
412 out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].integer.value;
413
414 print_update_debug_info(&update_result, pfru_dev);
415 ret = 0;
416
417 free_acpi_buffer:
418 ACPI_FREE(out_obj);
419
420 return ret;
421 }
422
pfru_ioctl(struct file * file,unsigned int cmd,unsigned long arg)423 static long pfru_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
424 {
425 struct pfru_update_cap_info cap_hdr;
426 struct pfru_device *pfru_dev = to_pfru_dev(file);
427 void __user *p = (void __user *)arg;
428 u32 rev;
429 int ret;
430
431 switch (cmd) {
432 case PFRU_IOC_QUERY_CAP:
433 ret = query_capability(&cap_hdr, pfru_dev);
434 if (ret)
435 return ret;
436
437 if (copy_to_user(p, &cap_hdr, sizeof(cap_hdr)))
438 return -EFAULT;
439
440 return 0;
441
442 case PFRU_IOC_SET_REV:
443 if (copy_from_user(&rev, p, sizeof(rev)))
444 return -EFAULT;
445
446 if (!pfru_valid_revid(rev))
447 return -EINVAL;
448
449 pfru_dev->rev_id = rev;
450
451 return 0;
452
453 case PFRU_IOC_STAGE:
454 return start_update(START_STAGE, pfru_dev);
455
456 case PFRU_IOC_ACTIVATE:
457 return start_update(START_ACTIVATE, pfru_dev);
458
459 case PFRU_IOC_STAGE_ACTIVATE:
460 return start_update(START_STAGE_ACTIVATE, pfru_dev);
461
462 default:
463 return -ENOTTY;
464 }
465 }
466
pfru_write(struct file * file,const char __user * buf,size_t len,loff_t * ppos)467 static ssize_t pfru_write(struct file *file, const char __user *buf,
468 size_t len, loff_t *ppos)
469 {
470 struct pfru_device *pfru_dev = to_pfru_dev(file);
471 struct pfru_update_cap_info cap;
472 struct pfru_com_buf_info buf_info;
473 phys_addr_t phy_addr;
474 struct iov_iter iter;
475 struct iovec iov;
476 char *buf_ptr;
477 int ret;
478
479 ret = query_buffer(&buf_info, pfru_dev);
480 if (ret)
481 return ret;
482
483 if (len > buf_info.buf_size) {
484 dev_dbg(pfru_dev->parent_dev, "Capsule image size too large\n");
485 return -EINVAL;
486 }
487
488 iov.iov_base = (void __user *)buf;
489 iov.iov_len = len;
490 iov_iter_init(&iter, ITER_SOURCE, &iov, 1, len);
491
492 /* map the communication buffer */
493 phy_addr = (phys_addr_t)((buf_info.addr_hi << 32) | buf_info.addr_lo);
494 buf_ptr = memremap(phy_addr, buf_info.buf_size, MEMREMAP_WB);
495 if (!buf_ptr) {
496 dev_dbg(pfru_dev->parent_dev, "Failed to remap the buffer\n");
497 return -ENOMEM;
498 }
499
500 if (!copy_from_iter_full(buf_ptr, len, &iter)) {
501 dev_dbg(pfru_dev->parent_dev,
502 "Failed to copy the data from the user space buffer\n");
503 ret = -EINVAL;
504 goto unmap;
505 }
506
507 /* check if the capsule header has a valid version number */
508 ret = query_capability(&cap, pfru_dev);
509 if (ret)
510 goto unmap;
511
512 if (!applicable_image(buf_ptr, &cap, pfru_dev))
513 ret = -EINVAL;
514
515 unmap:
516 memunmap(buf_ptr);
517
518 return ret ?: len;
519 }
520
521 static const struct file_operations acpi_pfru_fops = {
522 .owner = THIS_MODULE,
523 .write = pfru_write,
524 .unlocked_ioctl = pfru_ioctl,
525 .llseek = noop_llseek,
526 };
527
acpi_pfru_remove(struct platform_device * pdev)528 static void acpi_pfru_remove(struct platform_device *pdev)
529 {
530 struct pfru_device *pfru_dev = platform_get_drvdata(pdev);
531
532 misc_deregister(&pfru_dev->miscdev);
533 }
534
pfru_put_idx(void * data)535 static void pfru_put_idx(void *data)
536 {
537 struct pfru_device *pfru_dev = data;
538
539 ida_free(&pfru_ida, pfru_dev->index);
540 }
541
acpi_pfru_probe(struct platform_device * pdev)542 static int acpi_pfru_probe(struct platform_device *pdev)
543 {
544 struct pfru_device *pfru_dev;
545 acpi_handle handle;
546 int ret;
547
548 handle = ACPI_HANDLE(&pdev->dev);
549 if (!handle)
550 return -ENODEV;
551
552 if (!acpi_has_method(handle, "_DSM")) {
553 dev_dbg(&pdev->dev, "Missing _DSM\n");
554 return -ENODEV;
555 }
556
557 pfru_dev = devm_kzalloc(&pdev->dev, sizeof(*pfru_dev), GFP_KERNEL);
558 if (!pfru_dev)
559 return -ENOMEM;
560
561 ret = ida_alloc(&pfru_ida, GFP_KERNEL);
562 if (ret < 0)
563 return ret;
564
565 pfru_dev->index = ret;
566 ret = devm_add_action_or_reset(&pdev->dev, pfru_put_idx, pfru_dev);
567 if (ret)
568 return ret;
569
570 pfru_dev->rev_id = PFRU_DEFAULT_REV_ID;
571 pfru_dev->parent_dev = &pdev->dev;
572
573 pfru_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
574 pfru_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
575 "pfru%d", pfru_dev->index);
576 if (!pfru_dev->miscdev.name)
577 return -ENOMEM;
578
579 pfru_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL,
580 "acpi_pfr_update%d", pfru_dev->index);
581 if (!pfru_dev->miscdev.nodename)
582 return -ENOMEM;
583
584 pfru_dev->miscdev.fops = &acpi_pfru_fops;
585 pfru_dev->miscdev.parent = &pdev->dev;
586
587 ret = misc_register(&pfru_dev->miscdev);
588 if (ret)
589 return ret;
590
591 platform_set_drvdata(pdev, pfru_dev);
592
593 return 0;
594 }
595
596 static const struct acpi_device_id acpi_pfru_ids[] = {
597 {"INTC1080"},
598 {}
599 };
600 MODULE_DEVICE_TABLE(acpi, acpi_pfru_ids);
601
602 static struct platform_driver acpi_pfru_driver = {
603 .driver = {
604 .name = "pfr_update",
605 .acpi_match_table = acpi_pfru_ids,
606 },
607 .probe = acpi_pfru_probe,
608 .remove = acpi_pfru_remove,
609 };
610 module_platform_driver(acpi_pfru_driver);
611
612 MODULE_DESCRIPTION("Platform Firmware Runtime Update device driver");
613 MODULE_LICENSE("GPL v2");
614