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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * ACPI Platform Firmware Runtime Update Device driver
0004  *
0005  * Copyright (C) 2021 Intel Corporation
0006  * Author: Chen Yu <yu.c.chen@intel.com>
0007  *
0008  * pfr_update driver is used for Platform Firmware Runtime
0009  * Update, which includes the code injection and driver update.
0010  */
0011 #include <linux/acpi.h>
0012 #include <linux/device.h>
0013 #include <linux/efi.h>
0014 #include <linux/err.h>
0015 #include <linux/errno.h>
0016 #include <linux/file.h>
0017 #include <linux/fs.h>
0018 #include <linux/idr.h>
0019 #include <linux/miscdevice.h>
0020 #include <linux/module.h>
0021 #include <linux/platform_device.h>
0022 #include <linux/string.h>
0023 #include <linux/uaccess.h>
0024 #include <linux/uio.h>
0025 #include <linux/uuid.h>
0026 
0027 #include <uapi/linux/pfrut.h>
0028 
0029 #define PFRU_FUNC_STANDARD_QUERY    0
0030 #define PFRU_FUNC_QUERY_UPDATE_CAP  1
0031 #define PFRU_FUNC_QUERY_BUF     2
0032 #define PFRU_FUNC_START     3
0033 
0034 #define PFRU_CODE_INJECT_TYPE   1
0035 #define PFRU_DRIVER_UPDATE_TYPE 2
0036 
0037 #define PFRU_REVID_1        1
0038 #define PFRU_REVID_2        2
0039 #define PFRU_DEFAULT_REV_ID PFRU_REVID_1
0040 
0041 enum cap_index {
0042     CAP_STATUS_IDX = 0,
0043     CAP_UPDATE_IDX = 1,
0044     CAP_CODE_TYPE_IDX = 2,
0045     CAP_FW_VER_IDX = 3,
0046     CAP_CODE_RT_VER_IDX = 4,
0047     CAP_DRV_TYPE_IDX = 5,
0048     CAP_DRV_RT_VER_IDX = 6,
0049     CAP_DRV_SVN_IDX = 7,
0050     CAP_PLAT_ID_IDX = 8,
0051     CAP_OEM_ID_IDX = 9,
0052     CAP_OEM_INFO_IDX = 10,
0053     CAP_NR_IDX
0054 };
0055 
0056 enum buf_index {
0057     BUF_STATUS_IDX = 0,
0058     BUF_EXT_STATUS_IDX = 1,
0059     BUF_ADDR_LOW_IDX = 2,
0060     BUF_ADDR_HI_IDX = 3,
0061     BUF_SIZE_IDX = 4,
0062     BUF_NR_IDX
0063 };
0064 
0065 enum update_index {
0066     UPDATE_STATUS_IDX = 0,
0067     UPDATE_EXT_STATUS_IDX = 1,
0068     UPDATE_AUTH_TIME_LOW_IDX = 2,
0069     UPDATE_AUTH_TIME_HI_IDX = 3,
0070     UPDATE_EXEC_TIME_LOW_IDX = 4,
0071     UPDATE_EXEC_TIME_HI_IDX = 5,
0072     UPDATE_NR_IDX
0073 };
0074 
0075 enum pfru_start_action {
0076     START_STAGE = 0,
0077     START_ACTIVATE = 1,
0078     START_STAGE_ACTIVATE = 2,
0079 };
0080 
0081 struct pfru_device {
0082     u32 rev_id, index;
0083     struct device *parent_dev;
0084     struct miscdevice miscdev;
0085 };
0086 
0087 static DEFINE_IDA(pfru_ida);
0088 
0089 /*
0090  * Manual reference:
0091  * https://uefi.org/sites/default/files/resources/Intel_MM_OS_Interface_Spec_Rev100.pdf
0092  *
0093  * pfru_guid is the parameter for _DSM method
0094  */
0095 static const guid_t pfru_guid =
0096     GUID_INIT(0xECF9533B, 0x4A3C, 0x4E89, 0x93, 0x9E, 0xC7, 0x71,
0097           0x12, 0x60, 0x1C, 0x6D);
0098 
0099 /* pfru_code_inj_guid is the UUID to identify code injection EFI capsule file */
0100 static const guid_t pfru_code_inj_guid =
0101     GUID_INIT(0xB2F84B79, 0x7B6E, 0x4E45, 0x88, 0x5F, 0x3F, 0xB9,
0102           0xBB, 0x18, 0x54, 0x02);
0103 
0104 /* pfru_drv_update_guid is the UUID to identify driver update EFI capsule file */
0105 static const guid_t pfru_drv_update_guid =
0106     GUID_INIT(0x4569DD8C, 0x75F1, 0x429A, 0xA3, 0xD6, 0x24, 0xDE,
0107           0x80, 0x97, 0xA0, 0xDF);
0108 
0109 static inline int pfru_valid_revid(u32 id)
0110 {
0111     return id == PFRU_REVID_1 || id == PFRU_REVID_2;
0112 }
0113 
0114 static inline struct pfru_device *to_pfru_dev(struct file *file)
0115 {
0116     return container_of(file->private_data, struct pfru_device, miscdev);
0117 }
0118 
0119 static int query_capability(struct pfru_update_cap_info *cap_hdr,
0120                 struct pfru_device *pfru_dev)
0121 {
0122     acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
0123     union acpi_object *out_obj;
0124     int ret = -EINVAL;
0125 
0126     out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
0127                       pfru_dev->rev_id,
0128                       PFRU_FUNC_QUERY_UPDATE_CAP,
0129                       NULL, ACPI_TYPE_PACKAGE);
0130     if (!out_obj)
0131         return ret;
0132 
0133     if (out_obj->package.count < CAP_NR_IDX ||
0134         out_obj->package.elements[CAP_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
0135         out_obj->package.elements[CAP_UPDATE_IDX].type != ACPI_TYPE_INTEGER ||
0136         out_obj->package.elements[CAP_CODE_TYPE_IDX].type != ACPI_TYPE_BUFFER ||
0137         out_obj->package.elements[CAP_FW_VER_IDX].type != ACPI_TYPE_INTEGER ||
0138         out_obj->package.elements[CAP_CODE_RT_VER_IDX].type != ACPI_TYPE_INTEGER ||
0139         out_obj->package.elements[CAP_DRV_TYPE_IDX].type != ACPI_TYPE_BUFFER ||
0140         out_obj->package.elements[CAP_DRV_RT_VER_IDX].type != ACPI_TYPE_INTEGER ||
0141         out_obj->package.elements[CAP_DRV_SVN_IDX].type != ACPI_TYPE_INTEGER ||
0142         out_obj->package.elements[CAP_PLAT_ID_IDX].type != ACPI_TYPE_BUFFER ||
0143         out_obj->package.elements[CAP_OEM_ID_IDX].type != ACPI_TYPE_BUFFER ||
0144         out_obj->package.elements[CAP_OEM_INFO_IDX].type != ACPI_TYPE_BUFFER)
0145         goto free_acpi_buffer;
0146 
0147     cap_hdr->status = out_obj->package.elements[CAP_STATUS_IDX].integer.value;
0148     if (cap_hdr->status != DSM_SUCCEED) {
0149         ret = -EBUSY;
0150         dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", cap_hdr->status);
0151         goto free_acpi_buffer;
0152     }
0153 
0154     cap_hdr->update_cap = out_obj->package.elements[CAP_UPDATE_IDX].integer.value;
0155     memcpy(&cap_hdr->code_type,
0156            out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.pointer,
0157            out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.length);
0158     cap_hdr->fw_version =
0159         out_obj->package.elements[CAP_FW_VER_IDX].integer.value;
0160     cap_hdr->code_rt_version =
0161         out_obj->package.elements[CAP_CODE_RT_VER_IDX].integer.value;
0162     memcpy(&cap_hdr->drv_type,
0163            out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.pointer,
0164            out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.length);
0165     cap_hdr->drv_rt_version =
0166         out_obj->package.elements[CAP_DRV_RT_VER_IDX].integer.value;
0167     cap_hdr->drv_svn =
0168         out_obj->package.elements[CAP_DRV_SVN_IDX].integer.value;
0169     memcpy(&cap_hdr->platform_id,
0170            out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.pointer,
0171            out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.length);
0172     memcpy(&cap_hdr->oem_id,
0173            out_obj->package.elements[CAP_OEM_ID_IDX].buffer.pointer,
0174            out_obj->package.elements[CAP_OEM_ID_IDX].buffer.length);
0175     cap_hdr->oem_info_len =
0176         out_obj->package.elements[CAP_OEM_INFO_IDX].buffer.length;
0177 
0178     ret = 0;
0179 
0180 free_acpi_buffer:
0181     kfree(out_obj);
0182 
0183     return ret;
0184 }
0185 
0186 static int query_buffer(struct pfru_com_buf_info *info,
0187             struct pfru_device *pfru_dev)
0188 {
0189     acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
0190     union acpi_object *out_obj;
0191     int ret = -EINVAL;
0192 
0193     out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
0194                       pfru_dev->rev_id, PFRU_FUNC_QUERY_BUF,
0195                       NULL, ACPI_TYPE_PACKAGE);
0196     if (!out_obj)
0197         return ret;
0198 
0199     if (out_obj->package.count < BUF_NR_IDX ||
0200         out_obj->package.elements[BUF_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
0201         out_obj->package.elements[BUF_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
0202         out_obj->package.elements[BUF_ADDR_LOW_IDX].type != ACPI_TYPE_INTEGER ||
0203         out_obj->package.elements[BUF_ADDR_HI_IDX].type != ACPI_TYPE_INTEGER ||
0204         out_obj->package.elements[BUF_SIZE_IDX].type != ACPI_TYPE_INTEGER)
0205         goto free_acpi_buffer;
0206 
0207     info->status = out_obj->package.elements[BUF_STATUS_IDX].integer.value;
0208     info->ext_status =
0209         out_obj->package.elements[BUF_EXT_STATUS_IDX].integer.value;
0210     if (info->status != DSM_SUCCEED) {
0211         ret = -EBUSY;
0212         dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", info->status);
0213         dev_dbg(pfru_dev->parent_dev, "Error Extended Status:%d\n", info->ext_status);
0214 
0215         goto free_acpi_buffer;
0216     }
0217 
0218     info->addr_lo =
0219         out_obj->package.elements[BUF_ADDR_LOW_IDX].integer.value;
0220     info->addr_hi =
0221         out_obj->package.elements[BUF_ADDR_HI_IDX].integer.value;
0222     info->buf_size = out_obj->package.elements[BUF_SIZE_IDX].integer.value;
0223 
0224     ret = 0;
0225 
0226 free_acpi_buffer:
0227     kfree(out_obj);
0228 
0229     return ret;
0230 }
0231 
0232 static int get_image_type(const struct efi_manage_capsule_image_header *img_hdr,
0233               struct pfru_device *pfru_dev)
0234 {
0235     const efi_guid_t *image_type_id = &img_hdr->image_type_id;
0236 
0237     /* check whether this is a code injection or driver update */
0238     if (guid_equal(image_type_id, &pfru_code_inj_guid))
0239         return PFRU_CODE_INJECT_TYPE;
0240 
0241     if (guid_equal(image_type_id, &pfru_drv_update_guid))
0242         return PFRU_DRIVER_UPDATE_TYPE;
0243 
0244     return -EINVAL;
0245 }
0246 
0247 static int adjust_efi_size(const struct efi_manage_capsule_image_header *img_hdr,
0248                int size)
0249 {
0250     /*
0251      * The (u64 hw_ins) was introduced in UEFI spec version 2,
0252      * and (u64 capsule_support) was introduced in version 3.
0253      * The size needs to be adjusted accordingly. That is to
0254      * say, version 1 should subtract the size of hw_ins+capsule_support,
0255      * and version 2 should sbstract the size of capsule_support.
0256      */
0257     size += sizeof(struct efi_manage_capsule_image_header);
0258     switch (img_hdr->ver) {
0259     case 1:
0260         return size - 2 * sizeof(u64);
0261 
0262     case 2:
0263         return size - sizeof(u64);
0264 
0265     default:
0266         /* only support version 1 and 2 */
0267         return -EINVAL;
0268     }
0269 }
0270 
0271 static bool applicable_image(const void *data, struct pfru_update_cap_info *cap,
0272                  struct pfru_device *pfru_dev)
0273 {
0274     struct pfru_payload_hdr *payload_hdr;
0275     const efi_capsule_header_t *cap_hdr = data;
0276     const struct efi_manage_capsule_header *m_hdr;
0277     const struct efi_manage_capsule_image_header *m_img_hdr;
0278     const struct efi_image_auth *auth;
0279     int type, size;
0280 
0281     /*
0282      * If the code in the capsule is older than the current
0283      * firmware code, the update will be rejected by the firmware,
0284      * so check the version of it upfront without engaging the
0285      * Management Mode update mechanism which may be costly.
0286      */
0287     size = cap_hdr->headersize;
0288     m_hdr = data + size;
0289     /*
0290      * Current data structure size plus variable array indicated
0291      * by number of (emb_drv_cnt + payload_cnt)
0292      */
0293     size += offsetof(struct efi_manage_capsule_header, offset_list) +
0294         (m_hdr->emb_drv_cnt + m_hdr->payload_cnt) * sizeof(u64);
0295     m_img_hdr = data + size;
0296 
0297     type = get_image_type(m_img_hdr, pfru_dev);
0298     if (type < 0)
0299         return false;
0300 
0301     size = adjust_efi_size(m_img_hdr, size);
0302     if (size < 0)
0303         return false;
0304 
0305     auth = data + size;
0306     size += sizeof(u64) + auth->auth_info.hdr.len;
0307     payload_hdr = (struct pfru_payload_hdr *)(data + size);
0308 
0309     /* finally compare the version */
0310     if (type == PFRU_CODE_INJECT_TYPE)
0311         return payload_hdr->rt_ver >= cap->code_rt_version;
0312 
0313     return payload_hdr->rt_ver >= cap->drv_rt_version;
0314 }
0315 
0316 static void print_update_debug_info(struct pfru_updated_result *result,
0317                     struct pfru_device *pfru_dev)
0318 {
0319     dev_dbg(pfru_dev->parent_dev, "Update result:\n");
0320     dev_dbg(pfru_dev->parent_dev, "Authentication Time Low:%lld\n",
0321         result->low_auth_time);
0322     dev_dbg(pfru_dev->parent_dev, "Authentication Time High:%lld\n",
0323         result->high_auth_time);
0324     dev_dbg(pfru_dev->parent_dev, "Execution Time Low:%lld\n",
0325         result->low_exec_time);
0326     dev_dbg(pfru_dev->parent_dev, "Execution Time High:%lld\n",
0327         result->high_exec_time);
0328 }
0329 
0330 static int start_update(int action, struct pfru_device *pfru_dev)
0331 {
0332     union acpi_object *out_obj, in_obj, in_buf;
0333     struct pfru_updated_result update_result;
0334     acpi_handle handle;
0335     int ret = -EINVAL;
0336 
0337     memset(&in_obj, 0, sizeof(in_obj));
0338     memset(&in_buf, 0, sizeof(in_buf));
0339     in_obj.type = ACPI_TYPE_PACKAGE;
0340     in_obj.package.count = 1;
0341     in_obj.package.elements = &in_buf;
0342     in_buf.type = ACPI_TYPE_INTEGER;
0343     in_buf.integer.value = action;
0344 
0345     handle = ACPI_HANDLE(pfru_dev->parent_dev);
0346     out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
0347                       pfru_dev->rev_id, PFRU_FUNC_START,
0348                       &in_obj, ACPI_TYPE_PACKAGE);
0349     if (!out_obj)
0350         return ret;
0351 
0352     if (out_obj->package.count < UPDATE_NR_IDX ||
0353         out_obj->package.elements[UPDATE_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
0354         out_obj->package.elements[UPDATE_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
0355         out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
0356         out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].type != ACPI_TYPE_INTEGER ||
0357         out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
0358         out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].type != ACPI_TYPE_INTEGER)
0359         goto free_acpi_buffer;
0360 
0361     update_result.status =
0362         out_obj->package.elements[UPDATE_STATUS_IDX].integer.value;
0363     update_result.ext_status =
0364         out_obj->package.elements[UPDATE_EXT_STATUS_IDX].integer.value;
0365 
0366     if (update_result.status != DSM_SUCCEED) {
0367         ret = -EBUSY;
0368         dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", update_result.status);
0369         dev_dbg(pfru_dev->parent_dev, "Error Extended Status:%d\n",
0370             update_result.ext_status);
0371 
0372         goto free_acpi_buffer;
0373     }
0374 
0375     update_result.low_auth_time =
0376         out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].integer.value;
0377     update_result.high_auth_time =
0378         out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].integer.value;
0379     update_result.low_exec_time =
0380         out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].integer.value;
0381     update_result.high_exec_time =
0382         out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].integer.value;
0383 
0384     print_update_debug_info(&update_result, pfru_dev);
0385     ret = 0;
0386 
0387 free_acpi_buffer:
0388     kfree(out_obj);
0389 
0390     return ret;
0391 }
0392 
0393 static long pfru_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
0394 {
0395     struct pfru_update_cap_info cap_hdr;
0396     struct pfru_device *pfru_dev = to_pfru_dev(file);
0397     void __user *p = (void __user *)arg;
0398     u32 rev;
0399     int ret;
0400 
0401     switch (cmd) {
0402     case PFRU_IOC_QUERY_CAP:
0403         ret = query_capability(&cap_hdr, pfru_dev);
0404         if (ret)
0405             return ret;
0406 
0407         if (copy_to_user(p, &cap_hdr, sizeof(cap_hdr)))
0408             return -EFAULT;
0409 
0410         return 0;
0411 
0412     case PFRU_IOC_SET_REV:
0413         if (copy_from_user(&rev, p, sizeof(rev)))
0414             return -EFAULT;
0415 
0416         if (!pfru_valid_revid(rev))
0417             return -EINVAL;
0418 
0419         pfru_dev->rev_id = rev;
0420 
0421         return 0;
0422 
0423     case PFRU_IOC_STAGE:
0424         return start_update(START_STAGE, pfru_dev);
0425 
0426     case PFRU_IOC_ACTIVATE:
0427         return start_update(START_ACTIVATE, pfru_dev);
0428 
0429     case PFRU_IOC_STAGE_ACTIVATE:
0430         return start_update(START_STAGE_ACTIVATE, pfru_dev);
0431 
0432     default:
0433         return -ENOTTY;
0434     }
0435 }
0436 
0437 static ssize_t pfru_write(struct file *file, const char __user *buf,
0438               size_t len, loff_t *ppos)
0439 {
0440     struct pfru_device *pfru_dev = to_pfru_dev(file);
0441     struct pfru_update_cap_info cap;
0442     struct pfru_com_buf_info buf_info;
0443     phys_addr_t phy_addr;
0444     struct iov_iter iter;
0445     struct iovec iov;
0446     char *buf_ptr;
0447     int ret;
0448 
0449     ret = query_buffer(&buf_info, pfru_dev);
0450     if (ret)
0451         return ret;
0452 
0453     if (len > buf_info.buf_size)
0454         return -EINVAL;
0455 
0456     iov.iov_base = (void __user *)buf;
0457     iov.iov_len = len;
0458     iov_iter_init(&iter, WRITE, &iov, 1, len);
0459 
0460     /* map the communication buffer */
0461     phy_addr = (phys_addr_t)((buf_info.addr_hi << 32) | buf_info.addr_lo);
0462     buf_ptr = memremap(phy_addr, buf_info.buf_size, MEMREMAP_WB);
0463     if (!buf_ptr)
0464         return -ENOMEM;
0465 
0466     if (!copy_from_iter_full(buf_ptr, len, &iter)) {
0467         ret = -EINVAL;
0468         goto unmap;
0469     }
0470 
0471     /* check if the capsule header has a valid version number */
0472     ret = query_capability(&cap, pfru_dev);
0473     if (ret)
0474         goto unmap;
0475 
0476     if (!applicable_image(buf_ptr, &cap, pfru_dev))
0477         ret = -EINVAL;
0478 
0479 unmap:
0480     memunmap(buf_ptr);
0481 
0482     return ret ?: len;
0483 }
0484 
0485 static const struct file_operations acpi_pfru_fops = {
0486     .owner      = THIS_MODULE,
0487     .write      = pfru_write,
0488     .unlocked_ioctl = pfru_ioctl,
0489     .llseek     = noop_llseek,
0490 };
0491 
0492 static int acpi_pfru_remove(struct platform_device *pdev)
0493 {
0494     struct pfru_device *pfru_dev = platform_get_drvdata(pdev);
0495 
0496     misc_deregister(&pfru_dev->miscdev);
0497 
0498     return 0;
0499 }
0500 
0501 static void pfru_put_idx(void *data)
0502 {
0503     struct pfru_device *pfru_dev = data;
0504 
0505     ida_free(&pfru_ida, pfru_dev->index);
0506 }
0507 
0508 static int acpi_pfru_probe(struct platform_device *pdev)
0509 {
0510     acpi_handle handle = ACPI_HANDLE(&pdev->dev);
0511     struct pfru_device *pfru_dev;
0512     int ret;
0513 
0514     if (!acpi_has_method(handle, "_DSM")) {
0515         dev_dbg(&pdev->dev, "Missing _DSM\n");
0516         return -ENODEV;
0517     }
0518 
0519     pfru_dev = devm_kzalloc(&pdev->dev, sizeof(*pfru_dev), GFP_KERNEL);
0520     if (!pfru_dev)
0521         return -ENOMEM;
0522 
0523     ret = ida_alloc(&pfru_ida, GFP_KERNEL);
0524     if (ret < 0)
0525         return ret;
0526 
0527     pfru_dev->index = ret;
0528     ret = devm_add_action_or_reset(&pdev->dev, pfru_put_idx, pfru_dev);
0529     if (ret)
0530         return ret;
0531 
0532     pfru_dev->rev_id = PFRU_DEFAULT_REV_ID;
0533     pfru_dev->parent_dev = &pdev->dev;
0534 
0535     pfru_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
0536     pfru_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
0537                         "pfru%d", pfru_dev->index);
0538     if (!pfru_dev->miscdev.name)
0539         return -ENOMEM;
0540 
0541     pfru_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL,
0542                             "acpi_pfr_update%d", pfru_dev->index);
0543     if (!pfru_dev->miscdev.nodename)
0544         return -ENOMEM;
0545 
0546     pfru_dev->miscdev.fops = &acpi_pfru_fops;
0547     pfru_dev->miscdev.parent = &pdev->dev;
0548 
0549     ret = misc_register(&pfru_dev->miscdev);
0550     if (ret)
0551         return ret;
0552 
0553     platform_set_drvdata(pdev, pfru_dev);
0554 
0555     return 0;
0556 }
0557 
0558 static const struct acpi_device_id acpi_pfru_ids[] = {
0559     {"INTC1080"},
0560     {}
0561 };
0562 MODULE_DEVICE_TABLE(acpi, acpi_pfru_ids);
0563 
0564 static struct platform_driver acpi_pfru_driver = {
0565     .driver = {
0566         .name = "pfr_update",
0567         .acpi_match_table = acpi_pfru_ids,
0568     },
0569     .probe = acpi_pfru_probe,
0570     .remove = acpi_pfru_remove,
0571 };
0572 module_platform_driver(acpi_pfru_driver);
0573 
0574 MODULE_DESCRIPTION("Platform Firmware Runtime Update device driver");
0575 MODULE_LICENSE("GPL v2");
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