pfr_update.c

  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
 41enum 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
 56enum 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
 65enum 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
 75enum pfru_start_action {
 76	START_STAGE = 0,
 77	START_ACTIVATE = 1,
 78	START_STAGE_ACTIVATE = 2,
 79};
 80
 81struct pfru_device {
 82	u32 rev_id, index;
 83	struct device *parent_dev;
 84	struct miscdevice miscdev;
 85};
 86
 87static 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 */
 95static 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 */
100static 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 */
105static const guid_t pfru_drv_update_guid =
106	GUID_INIT(0x4569DD8C, 0x75F1, 0x429A, 0xA3, 0xD6, 0x24, 0xDE,
107		  0x80, 0x97, 0xA0, 0xDF);
108
109static inline int pfru_valid_revid(u32 id)
110{
111	return id == PFRU_REVID_1 || id == PFRU_REVID_2;
112}
113
114static inline struct pfru_device *to_pfru_dev(struct file *file)
115{
116	return container_of(file->private_data, struct pfru_device, miscdev);
117}
118
119static 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
187free_acpi_buffer:
188	ACPI_FREE(out_obj);
189
190	return ret;
191}
192
193static 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
241free_acpi_buffer:
242	ACPI_FREE(out_obj);
243
244	return ret;
245}
246
247static 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
262static 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
286static 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->svn_ver >= cap->drv_svn;
333}
334
335static 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
349static 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
414free_acpi_buffer:
415	ACPI_FREE(out_obj);
416
417	return ret;
418}
419
420static 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
464static 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
512unmap:
513	memunmap(buf_ptr);
514
515	return ret ?: len;
516}
517
518static 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
525static 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
532static 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
539static 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
589static const struct acpi_device_id acpi_pfru_ids[] = {
590	{"INTC1080"},
591	{}
592};
593MODULE_DEVICE_TABLE(acpi, acpi_pfru_ids);
594
595static 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};
603module_platform_driver(acpi_pfru_driver);
604
605MODULE_DESCRIPTION("Platform Firmware Runtime Update device driver");
606MODULE_LICENSE("GPL v2");