drivers/misc/mei/bus-fixup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2013-2020, Intel Corporation. All rights reserved.
   4  * Intel Management Engine Interface (Intel MEI) Linux driver
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/sched.h>
   9 #include <linux/module.h>
  10 #include <linux/device.h>
  11 #include <linux/slab.h>
  12 #include <linux/uuid.h>
  13
  14 #include <linux/mei_cl_bus.h>
  15
  16 #include "mei_dev.h"
  17 #include "client.h"
  18
  19 #define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \
  20                         0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06)
  21
  22 static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;
  23
  24 #define MEI_UUID_NFC_HCI UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, \
  25                         0x94, 0xd4, 0x50, 0x26, 0x67, 0x23, 0x77, 0x5c)
  26
  27 #define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \
  28                             0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB)
  29
  30 #define MEI_UUID_MKHIF_FIX UUID_LE(0x55213584, 0x9a29, 0x4916, \
  31                         0xba, 0xdf, 0xf, 0xb7, 0xed, 0x68, 0x2a, 0xeb)
  32
  33 #define MEI_UUID_HDCP UUID_LE(0xB638AB7E, 0x94E2, 0x4EA2, \
  34                               0xA5, 0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)
  35
  36 #define MEI_UUID_ANY NULL_UUID_LE
  37
  38 /**
  39  * number_of_connections - determine whether an client be on the bus
  40  *    according number of connections
  41  *    We support only clients:
  42  *       1. with single connection
  43  *       2. and fixed clients (max_number_of_connections == 0)
  44  *
  45  * @cldev: me clients device
  46  */
  47 static void number_of_connections(struct mei_cl_device *cldev)
  48 {
  49         if (cldev->me_cl->props.max_number_of_connections > 1)
  50                 cldev->do_match = 0;
  51 }
  52
  53 /**
  54  * blacklist - blacklist a client from the bus
  55  *
  56  * @cldev: me clients device
  57  */
  58 static void blacklist(struct mei_cl_device *cldev)
  59 {
  60         cldev->do_match = 0;
  61 }
  62
  63 /**
  64  * whitelist - forcefully whitelist client
  65  *
  66  * @cldev: me clients device
  67  */
  68 static void whitelist(struct mei_cl_device *cldev)
  69 {
  70         cldev->do_match = 1;
  71 }
  72
  73 #define OSTYPE_LINUX    2
  74 struct mei_os_ver {
  75         __le16 build;
  76         __le16 reserved1;
  77         u8  os_type;
  78         u8  major;
  79         u8  minor;
  80         u8  reserved2;
  81 } __packed;
  82
  83 #define MKHI_FEATURE_PTT 0x10
  84
  85 struct mkhi_rule_id {
  86         __le16 rule_type;
  87         u8 feature_id;
  88         u8 reserved;
  89 } __packed;
  90
  91 struct mkhi_fwcaps {
  92         struct mkhi_rule_id id;
  93         u8 len;
  94         u8 data[];
  95 } __packed;
  96
  97 struct mkhi_fw_ver_block {
  98         u16 minor;
  99         u8 major;
 100         u8 platform;
 101         u16 buildno;
 102         u16 hotfix;
 103 } __packed;
 104
 105 struct mkhi_fw_ver {
 106         struct mkhi_fw_ver_block ver[MEI_MAX_FW_VER_BLOCKS];
 107 } __packed;
 108
 109 #define MKHI_FWCAPS_GROUP_ID 0x3
 110 #define MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD 6
 111 #define MKHI_GEN_GROUP_ID 0xFF
 112 #define MKHI_GEN_GET_FW_VERSION_CMD 0x2
 113 struct mkhi_msg_hdr {
 114         u8  group_id;
 115         u8  command;
 116         u8  reserved;
 117         u8  result;
 118 } __packed;
 119
 120 struct mkhi_msg {
 121         struct mkhi_msg_hdr hdr;
 122         u8 data[];
 123 } __packed;
 124
 125 #define MKHI_OSVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
 126                             sizeof(struct mkhi_fwcaps) + \
 127                             sizeof(struct mei_os_ver))
 128 static int mei_osver(struct mei_cl_device *cldev)
 129 {
 130         const size_t size = MKHI_OSVER_BUF_LEN;
 131         char buf[MKHI_OSVER_BUF_LEN];
 132         struct mkhi_msg *req;
 133         struct mkhi_fwcaps *fwcaps;
 134         struct mei_os_ver *os_ver;
 135         unsigned int mode = MEI_CL_IO_TX_BLOCKING | MEI_CL_IO_TX_INTERNAL;
 136
 137         memset(buf, 0, size);
 138
 139         req = (struct mkhi_msg *)buf;
 140         req->hdr.group_id = MKHI_FWCAPS_GROUP_ID;
 141         req->hdr.command = MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD;
 142
 143         fwcaps = (struct mkhi_fwcaps *)req->data;
 144
 145         fwcaps->id.rule_type = 0x0;
 146         fwcaps->id.feature_id = MKHI_FEATURE_PTT;
 147         fwcaps->len = sizeof(*os_ver);
 148         os_ver = (struct mei_os_ver *)fwcaps->data;
 149         os_ver->os_type = OSTYPE_LINUX;
 150
 151         return __mei_cl_send(cldev->cl, buf, size, mode);
 152 }
 153
 154 #define MKHI_FWVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
 155                             sizeof(struct mkhi_fw_ver))
 156 #define MKHI_FWVER_LEN(__num) (sizeof(struct mkhi_msg_hdr) + \
 157                                sizeof(struct mkhi_fw_ver_block) * (__num))
 158 #define MKHI_RCV_TIMEOUT 500 /* receive timeout in msec */
 159 static int mei_fwver(struct mei_cl_device *cldev)
 160 {
 161         char buf[MKHI_FWVER_BUF_LEN];
 162         struct mkhi_msg req;
 163         struct mkhi_msg *rsp;
 164         struct mkhi_fw_ver *fwver;
 165         int bytes_recv, ret, i;
 166
 167         memset(buf, 0, sizeof(buf));
 168
 169         req.hdr.group_id = MKHI_GEN_GROUP_ID;
 170         req.hdr.command = MKHI_GEN_GET_FW_VERSION_CMD;
 171
 172         ret = __mei_cl_send(cldev->cl, (u8 *)&req, sizeof(req),
 173                             MEI_CL_IO_TX_BLOCKING);
 174         if (ret < 0) {
 175                 dev_err(&cldev->dev, "Could not send ReqFWVersion cmd\n");
 176                 return ret;
 177         }
 178
 179         ret = 0;
 180         bytes_recv = __mei_cl_recv(cldev->cl, buf, sizeof(buf), 0,
 181                                    MKHI_RCV_TIMEOUT);
 182         if (bytes_recv < 0 || (size_t)bytes_recv < MKHI_FWVER_LEN(1)) {
 183                 /*
 184                  * Should be at least one version block,
 185                  * error out if nothing found
 186                  */
 187                 dev_err(&cldev->dev, "Could not read FW version\n");
 188                 return -EIO;
 189         }
 190
 191         rsp = (struct mkhi_msg *)buf;
 192         fwver = (struct mkhi_fw_ver *)rsp->data;
 193         memset(cldev->bus->fw_ver, 0, sizeof(cldev->bus->fw_ver));
 194         for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) {
 195                 if ((size_t)bytes_recv < MKHI_FWVER_LEN(i + 1))
 196                         break;
 197                 dev_dbg(&cldev->dev, "FW version%d %d:%d.%d.%d.%d\n",
 198                         i, fwver->ver[i].platform,
 199                         fwver->ver[i].major, fwver->ver[i].minor,
 200                         fwver->ver[i].hotfix, fwver->ver[i].buildno);
 201
 202                 cldev->bus->fw_ver[i].platform = fwver->ver[i].platform;
 203                 cldev->bus->fw_ver[i].major = fwver->ver[i].major;
 204                 cldev->bus->fw_ver[i].minor = fwver->ver[i].minor;
 205                 cldev->bus->fw_ver[i].hotfix = fwver->ver[i].hotfix;
 206                 cldev->bus->fw_ver[i].buildno = fwver->ver[i].buildno;
 207         }
 208
 209         return ret;
 210 }
 211
 212 static void mei_mkhi_fix(struct mei_cl_device *cldev)
 213 {
 214         int ret;
 215
 216         /* No need to enable the client if nothing is needed from it */
 217         if (!cldev->bus->fw_f_fw_ver_supported &&
 218             !cldev->bus->hbm_f_os_supported)
 219                 return;
 220
 221         ret = mei_cldev_enable(cldev);
 222         if (ret)
 223                 return;
 224
 225         if (cldev->bus->fw_f_fw_ver_supported) {
 226                 ret = mei_fwver(cldev);
 227                 if (ret < 0)
 228                         dev_err(&cldev->dev, "FW version command failed %d\n",
 229                                 ret);
 230         }
 231
 232         if (cldev->bus->hbm_f_os_supported) {
 233                 ret = mei_osver(cldev);
 234                 if (ret < 0)
 235                         dev_err(&cldev->dev, "OS version command failed %d\n",
 236                                 ret);
 237         }
 238         mei_cldev_disable(cldev);
 239 }
 240
 241 /**
 242  * mei_wd - wd client on the bus, change protocol version
 243  *   as the API has changed.
 244  *
 245  * @cldev: me clients device
 246  */
 247 #if IS_ENABLED(CONFIG_INTEL_MEI_ME)
 248 #include <linux/pci.h>
 249 #include "hw-me-regs.h"
 250 static void mei_wd(struct mei_cl_device *cldev)
 251 {
 252         struct pci_dev *pdev = to_pci_dev(cldev->dev.parent);
 253
 254         if (pdev->device == MEI_DEV_ID_WPT_LP ||
 255             pdev->device == MEI_DEV_ID_SPT ||
 256             pdev->device == MEI_DEV_ID_SPT_H)
 257                 cldev->me_cl->props.protocol_version = 0x2;
 258
 259         cldev->do_match = 1;
 260 }
 261 #else
 262 static inline void mei_wd(struct mei_cl_device *cldev) {}
 263 #endif /* CONFIG_INTEL_MEI_ME */
 264
 265 struct mei_nfc_cmd {
 266         u8 command;
 267         u8 status;
 268         u16 req_id;
 269         u32 reserved;
 270         u16 data_size;
 271         u8 sub_command;
 272         u8 data[];
 273 } __packed;
 274
 275 struct mei_nfc_reply {
 276         u8 command;
 277         u8 status;
 278         u16 req_id;
 279         u32 reserved;
 280         u16 data_size;
 281         u8 sub_command;
 282         u8 reply_status;
 283         u8 data[];
 284 } __packed;
 285
 286 struct mei_nfc_if_version {
 287         u8 radio_version_sw[3];
 288         u8 reserved[3];
 289         u8 radio_version_hw[3];
 290         u8 i2c_addr;
 291         u8 fw_ivn;
 292         u8 vendor_id;
 293         u8 radio_type;
 294 } __packed;
 295
 296
 297 #define MEI_NFC_CMD_MAINTENANCE 0x00
 298 #define MEI_NFC_SUBCMD_IF_VERSION 0x01
 299
 300 /* Vendors */
 301 #define MEI_NFC_VENDOR_INSIDE 0x00
 302 #define MEI_NFC_VENDOR_NXP    0x01
 303
 304 /* Radio types */
 305 #define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
 306 #define MEI_NFC_VENDOR_NXP_PN544    0x01
 307
 308 /**
 309  * mei_nfc_if_version - get NFC interface version
 310  *
 311  * @cl: host client (nfc info)
 312  * @ver: NFC interface version to be filled in
 313  *
 314  * Return: 0 on success; < 0 otherwise
 315  */
 316 static int mei_nfc_if_version(struct mei_cl *cl,
 317                               struct mei_nfc_if_version *ver)
 318 {
 319         struct mei_device *bus;
 320         struct mei_nfc_cmd cmd = {
 321                 .command = MEI_NFC_CMD_MAINTENANCE,
 322                 .data_size = 1,
 323                 .sub_command = MEI_NFC_SUBCMD_IF_VERSION,
 324         };
 325         struct mei_nfc_reply *reply = NULL;
 326         size_t if_version_length;
 327         int bytes_recv, ret;
 328
 329         bus = cl->dev;
 330
 331         WARN_ON(mutex_is_locked(&bus->device_lock));
 332
 333         ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(cmd), MEI_CL_IO_TX_BLOCKING);
 334         if (ret < 0) {
 335                 dev_err(bus->dev, "Could not send IF version cmd\n");
 336                 return ret;
 337         }
 338
 339         /* to be sure on the stack we alloc memory */
 340         if_version_length = sizeof(*reply) + sizeof(*ver);
 341
 342         reply = kzalloc(if_version_length, GFP_KERNEL);
 343         if (!reply)
 344                 return -ENOMEM;
 345
 346         ret = 0;
 347         bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, 0, 0);
 348         if (bytes_recv < 0 || (size_t)bytes_recv < if_version_length) {
 349                 dev_err(bus->dev, "Could not read IF version\n");
 350                 ret = -EIO;
 351                 goto err;
 352         }
 353
 354         memcpy(ver, reply->data, sizeof(*ver));
 355
 356         dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
 357                 ver->fw_ivn, ver->vendor_id, ver->radio_type);
 358
 359 err:
 360         kfree(reply);
 361         return ret;
 362 }
 363
 364 /**
 365  * mei_nfc_radio_name - derive nfc radio name from the interface version
 366  *
 367  * @ver: NFC radio version
 368  *
 369  * Return: radio name string
 370  */
 371 static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver)
 372 {
 373
 374         if (ver->vendor_id == MEI_NFC_VENDOR_INSIDE) {
 375                 if (ver->radio_type == MEI_NFC_VENDOR_INSIDE_UREAD)
 376                         return "microread";
 377         }
 378
 379         if (ver->vendor_id == MEI_NFC_VENDOR_NXP) {
 380                 if (ver->radio_type == MEI_NFC_VENDOR_NXP_PN544)
 381                         return "pn544";
 382         }
 383
 384         return NULL;
 385 }
 386
 387 /**
 388  * mei_nfc - The nfc fixup function. The function retrieves nfc radio
 389  *    name and set is as device attribute so we can load
 390  *    the proper device driver for it
 391  *
 392  * @cldev: me client device (nfc)
 393  */
 394 static void mei_nfc(struct mei_cl_device *cldev)
 395 {
 396         struct mei_device *bus;
 397         struct mei_cl *cl;
 398         struct mei_me_client *me_cl = NULL;
 399         struct mei_nfc_if_version ver;
 400         const char *radio_name = NULL;
 401         int ret;
 402
 403         bus = cldev->bus;
 404
 405         mutex_lock(&bus->device_lock);
 406         /* we need to connect to INFO GUID */
 407         cl = mei_cl_alloc_linked(bus);
 408         if (IS_ERR(cl)) {
 409                 ret = PTR_ERR(cl);
 410                 cl = NULL;
 411                 dev_err(bus->dev, "nfc hook alloc failed %d\n", ret);
 412                 goto out;
 413         }
 414
 415         me_cl = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid);
 416         if (!me_cl) {
 417                 ret = -ENOTTY;
 418                 dev_err(bus->dev, "Cannot find nfc info %d\n", ret);
 419                 goto out;
 420         }
 421
 422         ret = mei_cl_connect(cl, me_cl, NULL);
 423         if (ret < 0) {
 424                 dev_err(&cldev->dev, "Can't connect to the NFC INFO ME ret = %d\n",
 425                         ret);
 426                 goto out;
 427         }
 428
 429         mutex_unlock(&bus->device_lock);
 430
 431         ret = mei_nfc_if_version(cl, &ver);
 432         if (ret)
 433                 goto disconnect;
 434
 435         radio_name = mei_nfc_radio_name(&ver);
 436
 437         if (!radio_name) {
 438                 ret = -ENOENT;
 439                 dev_err(&cldev->dev, "Can't get the NFC interface version ret = %d\n",
 440                         ret);
 441                 goto disconnect;
 442         }
 443
 444         dev_dbg(bus->dev, "nfc radio %s\n", radio_name);
 445         strlcpy(cldev->name, radio_name, sizeof(cldev->name));
 446
 447 disconnect:
 448         mutex_lock(&bus->device_lock);
 449         if (mei_cl_disconnect(cl) < 0)
 450                 dev_err(bus->dev, "Can't disconnect the NFC INFO ME\n");
 451
 452         mei_cl_flush_queues(cl, NULL);
 453
 454 out:
 455         mei_cl_unlink(cl);
 456         mutex_unlock(&bus->device_lock);
 457         mei_me_cl_put(me_cl);
 458         kfree(cl);
 459
 460         if (ret)
 461                 cldev->do_match = 0;
 462
 463         dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match);
 464 }
 465
 466 /**
 467  * vt_support - enable on bus clients with vtag support
 468  *
 469  * @cldev: me clients device
 470  */
 471 static void vt_support(struct mei_cl_device *cldev)
 472 {
 473         if (cldev->me_cl->props.vt_supported == 1)
 474                 cldev->do_match = 1;
 475 }
 476
 477 #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
 478
 479 static struct mei_fixup {
 480
 481         const uuid_le uuid;
 482         void (*hook)(struct mei_cl_device *cldev);
 483 } mei_fixups[] = {
 484         MEI_FIXUP(MEI_UUID_ANY, number_of_connections),
 485         MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
 486         MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc),
 487         MEI_FIXUP(MEI_UUID_WD, mei_wd),
 488         MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
 489         MEI_FIXUP(MEI_UUID_HDCP, whitelist),
 490         MEI_FIXUP(MEI_UUID_ANY, vt_support),
 491 };
 492
 493 /**
 494  * mei_cldev_fixup - run fixup handlers
 495  *
 496  * @cldev: me client device
 497  */
 498 void mei_cl_bus_dev_fixup(struct mei_cl_device *cldev)
 499 {
 500         struct mei_fixup *f;
 501         const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
 502         size_t i;
 503
 504         for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) {
 505
 506                 f = &mei_fixups[i];
 507                 if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 ||
 508                     uuid_le_cmp(f->uuid, *uuid) == 0)
 509                         f->hook(cldev);
 510         }
 511 }
 512