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_PAVP UUID_LE(0xfbf6fcf1, 0x96cf, 0x4e2e, 0xA6, \
  37                               0xa6, 0x1b, 0xab, 0x8c, 0xbe, 0x36, 0xb1)
  38
  39 #define MEI_UUID_ANY NULL_UUID_LE
  40
  41 /**
  42  * number_of_connections - determine whether an client be on the bus
  43  *    according number of connections
  44  *    We support only clients:
  45  *       1. with single connection
  46  *       2. and fixed clients (max_number_of_connections == 0)
  47  *
  48  * @cldev: me clients device
  49  */
  50 static void number_of_connections(struct mei_cl_device *cldev)
  51 {
  52         if (cldev->me_cl->props.max_number_of_connections > 1)
  53                 cldev->do_match = 0;
  54 }
  55
  56 /**
  57  * blacklist - blacklist a client from the bus
  58  *
  59  * @cldev: me clients device
  60  */
  61 static void blacklist(struct mei_cl_device *cldev)
  62 {
  63         cldev->do_match = 0;
  64 }
  65
  66 /**
  67  * whitelist - forcefully whitelist client
  68  *
  69  * @cldev: me clients device
  70  */
  71 static void whitelist(struct mei_cl_device *cldev)
  72 {
  73         cldev->do_match = 1;
  74 }
  75
  76 #define OSTYPE_LINUX    2
  77 struct mei_os_ver {
  78         __le16 build;
  79         __le16 reserved1;
  80         u8  os_type;
  81         u8  major;
  82         u8  minor;
  83         u8  reserved2;
  84 } __packed;
  85
  86 #define MKHI_FEATURE_PTT 0x10
  87
  88 struct mkhi_rule_id {
  89         __le16 rule_type;
  90         u8 feature_id;
  91         u8 reserved;
  92 } __packed;
  93
  94 struct mkhi_fwcaps {
  95         struct mkhi_rule_id id;
  96         u8 len;
  97         u8 data[];
  98 } __packed;
  99
 100 struct mkhi_fw_ver_block {
 101         u16 minor;
 102         u8 major;
 103         u8 platform;
 104         u16 buildno;
 105         u16 hotfix;
 106 } __packed;
 107
 108 struct mkhi_fw_ver {
 109         struct mkhi_fw_ver_block ver[MEI_MAX_FW_VER_BLOCKS];
 110 } __packed;
 111
 112 #define MKHI_FWCAPS_GROUP_ID 0x3
 113 #define MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD 6
 114 #define MKHI_GEN_GROUP_ID 0xFF
 115 #define MKHI_GEN_GET_FW_VERSION_CMD 0x2
 116 struct mkhi_msg_hdr {
 117         u8  group_id;
 118         u8  command;
 119         u8  reserved;
 120         u8  result;
 121 } __packed;
 122
 123 struct mkhi_msg {
 124         struct mkhi_msg_hdr hdr;
 125         u8 data[];
 126 } __packed;
 127
 128 #define MKHI_OSVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
 129                             sizeof(struct mkhi_fwcaps) + \
 130                             sizeof(struct mei_os_ver))
 131 static int mei_osver(struct mei_cl_device *cldev)
 132 {
 133         const size_t size = MKHI_OSVER_BUF_LEN;
 134         char buf[MKHI_OSVER_BUF_LEN];
 135         struct mkhi_msg *req;
 136         struct mkhi_fwcaps *fwcaps;
 137         struct mei_os_ver *os_ver;
 138         unsigned int mode = MEI_CL_IO_TX_BLOCKING | MEI_CL_IO_TX_INTERNAL;
 139
 140         memset(buf, 0, size);
 141
 142         req = (struct mkhi_msg *)buf;
 143         req->hdr.group_id = MKHI_FWCAPS_GROUP_ID;
 144         req->hdr.command = MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD;
 145
 146         fwcaps = (struct mkhi_fwcaps *)req->data;
 147
 148         fwcaps->id.rule_type = 0x0;
 149         fwcaps->id.feature_id = MKHI_FEATURE_PTT;
 150         fwcaps->len = sizeof(*os_ver);
 151         os_ver = (struct mei_os_ver *)fwcaps->data;
 152         os_ver->os_type = OSTYPE_LINUX;
 153
 154         return __mei_cl_send(cldev->cl, buf, size, 0, mode);
 155 }
 156
 157 #define MKHI_FWVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
 158                             sizeof(struct mkhi_fw_ver))
 159 #define MKHI_FWVER_LEN(__num) (sizeof(struct mkhi_msg_hdr) + \
 160                                sizeof(struct mkhi_fw_ver_block) * (__num))
 161 #define MKHI_RCV_TIMEOUT 500 /* receive timeout in msec */
 162 static int mei_fwver(struct mei_cl_device *cldev)
 163 {
 164         char buf[MKHI_FWVER_BUF_LEN];
 165         struct mkhi_msg req;
 166         struct mkhi_msg *rsp;
 167         struct mkhi_fw_ver *fwver;
 168         int bytes_recv, ret, i;
 169
 170         memset(buf, 0, sizeof(buf));
 171
 172         req.hdr.group_id = MKHI_GEN_GROUP_ID;
 173         req.hdr.command = MKHI_GEN_GET_FW_VERSION_CMD;
 174
 175         ret = __mei_cl_send(cldev->cl, (u8 *)&req, sizeof(req), 0,
 176                             MEI_CL_IO_TX_BLOCKING);
 177         if (ret < 0) {
 178                 dev_err(&cldev->dev, "Could not send ReqFWVersion cmd\n");
 179                 return ret;
 180         }
 181
 182         ret = 0;
 183         bytes_recv = __mei_cl_recv(cldev->cl, buf, sizeof(buf), NULL, 0,
 184                                    MKHI_RCV_TIMEOUT);
 185         if (bytes_recv < 0 || (size_t)bytes_recv < MKHI_FWVER_LEN(1)) {
 186                 /*
 187                  * Should be at least one version block,
 188                  * error out if nothing found
 189                  */
 190                 dev_err(&cldev->dev, "Could not read FW version\n");
 191                 return -EIO;
 192         }
 193
 194         rsp = (struct mkhi_msg *)buf;
 195         fwver = (struct mkhi_fw_ver *)rsp->data;
 196         memset(cldev->bus->fw_ver, 0, sizeof(cldev->bus->fw_ver));
 197         for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) {
 198                 if ((size_t)bytes_recv < MKHI_FWVER_LEN(i + 1))
 199                         break;
 200                 dev_dbg(&cldev->dev, "FW version%d %d:%d.%d.%d.%d\n",
 201                         i, fwver->ver[i].platform,
 202                         fwver->ver[i].major, fwver->ver[i].minor,
 203                         fwver->ver[i].hotfix, fwver->ver[i].buildno);
 204
 205                 cldev->bus->fw_ver[i].platform = fwver->ver[i].platform;
 206                 cldev->bus->fw_ver[i].major = fwver->ver[i].major;
 207                 cldev->bus->fw_ver[i].minor = fwver->ver[i].minor;
 208                 cldev->bus->fw_ver[i].hotfix = fwver->ver[i].hotfix;
 209                 cldev->bus->fw_ver[i].buildno = fwver->ver[i].buildno;
 210         }
 211
 212         return ret;
 213 }
 214
 215 static void mei_mkhi_fix(struct mei_cl_device *cldev)
 216 {
 217         int ret;
 218
 219         /* No need to enable the client if nothing is needed from it */
 220         if (!cldev->bus->fw_f_fw_ver_supported &&
 221             !cldev->bus->hbm_f_os_supported)
 222                 return;
 223
 224         ret = mei_cldev_enable(cldev);
 225         if (ret)
 226                 return;
 227
 228         if (cldev->bus->fw_f_fw_ver_supported) {
 229                 ret = mei_fwver(cldev);
 230                 if (ret < 0)
 231                         dev_err(&cldev->dev, "FW version command failed %d\n",
 232                                 ret);
 233         }
 234
 235         if (cldev->bus->hbm_f_os_supported) {
 236                 ret = mei_osver(cldev);
 237                 if (ret < 0)
 238                         dev_err(&cldev->dev, "OS version command failed %d\n",
 239                                 ret);
 240         }
 241         mei_cldev_disable(cldev);
 242 }
 243
 244 /**
 245  * mei_wd - wd client on the bus, change protocol version
 246  *   as the API has changed.
 247  *
 248  * @cldev: me clients device
 249  */
 250 #if IS_ENABLED(CONFIG_INTEL_MEI_ME)
 251 #include <linux/pci.h>
 252 #include "hw-me-regs.h"
 253 static void mei_wd(struct mei_cl_device *cldev)
 254 {
 255         struct pci_dev *pdev = to_pci_dev(cldev->dev.parent);
 256
 257         if (pdev->device == MEI_DEV_ID_WPT_LP ||
 258             pdev->device == MEI_DEV_ID_SPT ||
 259             pdev->device == MEI_DEV_ID_SPT_H)
 260                 cldev->me_cl->props.protocol_version = 0x2;
 261
 262         cldev->do_match = 1;
 263 }
 264 #else
 265 static inline void mei_wd(struct mei_cl_device *cldev) {}
 266 #endif /* CONFIG_INTEL_MEI_ME */
 267
 268 struct mei_nfc_cmd {
 269         u8 command;
 270         u8 status;
 271         u16 req_id;
 272         u32 reserved;
 273         u16 data_size;
 274         u8 sub_command;
 275         u8 data[];
 276 } __packed;
 277
 278 struct mei_nfc_reply {
 279         u8 command;
 280         u8 status;
 281         u16 req_id;
 282         u32 reserved;
 283         u16 data_size;
 284         u8 sub_command;
 285         u8 reply_status;
 286         u8 data[];
 287 } __packed;
 288
 289 struct mei_nfc_if_version {
 290         u8 radio_version_sw[3];
 291         u8 reserved[3];
 292         u8 radio_version_hw[3];
 293         u8 i2c_addr;
 294         u8 fw_ivn;
 295         u8 vendor_id;
 296         u8 radio_type;
 297 } __packed;
 298
 299
 300 #define MEI_NFC_CMD_MAINTENANCE 0x00
 301 #define MEI_NFC_SUBCMD_IF_VERSION 0x01
 302
 303 /* Vendors */
 304 #define MEI_NFC_VENDOR_INSIDE 0x00
 305 #define MEI_NFC_VENDOR_NXP    0x01
 306
 307 /* Radio types */
 308 #define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
 309 #define MEI_NFC_VENDOR_NXP_PN544    0x01
 310
 311 /**
 312  * mei_nfc_if_version - get NFC interface version
 313  *
 314  * @cl: host client (nfc info)
 315  * @ver: NFC interface version to be filled in
 316  *
 317  * Return: 0 on success; < 0 otherwise
 318  */
 319 static int mei_nfc_if_version(struct mei_cl *cl,
 320                               struct mei_nfc_if_version *ver)
 321 {
 322         struct mei_device *bus;
 323         struct mei_nfc_cmd cmd = {
 324                 .command = MEI_NFC_CMD_MAINTENANCE,
 325                 .data_size = 1,
 326                 .sub_command = MEI_NFC_SUBCMD_IF_VERSION,
 327         };
 328         struct mei_nfc_reply *reply = NULL;
 329         size_t if_version_length;
 330         u8 vtag;
 331         int bytes_recv, ret;
 332
 333         bus = cl->dev;
 334
 335         WARN_ON(mutex_is_locked(&bus->device_lock));
 336
 337         ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(cmd), 0,
 338                             MEI_CL_IO_TX_BLOCKING);
 339         if (ret < 0) {
 340                 dev_err(bus->dev, "Could not send IF version cmd\n");
 341                 return ret;
 342         }
 343
 344         /* to be sure on the stack we alloc memory */
 345         if_version_length = sizeof(*reply) + sizeof(*ver);
 346
 347         reply = kzalloc(if_version_length, GFP_KERNEL);
 348         if (!reply)
 349                 return -ENOMEM;
 350
 351         ret = 0;
 352         bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, &vtag,
 353                                    0, 0);
 354         if (bytes_recv < 0 || (size_t)bytes_recv < if_version_length) {
 355                 dev_err(bus->dev, "Could not read IF version\n");
 356                 ret = -EIO;
 357                 goto err;
 358         }
 359
 360         memcpy(ver, reply->data, sizeof(*ver));
 361
 362         dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
 363                 ver->fw_ivn, ver->vendor_id, ver->radio_type);
 364
 365 err:
 366         kfree(reply);
 367         return ret;
 368 }
 369
 370 /**
 371  * mei_nfc_radio_name - derive nfc radio name from the interface version
 372  *
 373  * @ver: NFC radio version
 374  *
 375  * Return: radio name string
 376  */
 377 static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver)
 378 {
 379
 380         if (ver->vendor_id == MEI_NFC_VENDOR_INSIDE) {
 381                 if (ver->radio_type == MEI_NFC_VENDOR_INSIDE_UREAD)
 382                         return "microread";
 383         }
 384
 385         if (ver->vendor_id == MEI_NFC_VENDOR_NXP) {
 386                 if (ver->radio_type == MEI_NFC_VENDOR_NXP_PN544)
 387                         return "pn544";
 388         }
 389
 390         return NULL;
 391 }
 392
 393 /**
 394  * mei_nfc - The nfc fixup function. The function retrieves nfc radio
 395  *    name and set is as device attribute so we can load
 396  *    the proper device driver for it
 397  *
 398  * @cldev: me client device (nfc)
 399  */
 400 static void mei_nfc(struct mei_cl_device *cldev)
 401 {
 402         struct mei_device *bus;
 403         struct mei_cl *cl;
 404         struct mei_me_client *me_cl = NULL;
 405         struct mei_nfc_if_version ver;
 406         const char *radio_name = NULL;
 407         int ret;
 408
 409         bus = cldev->bus;
 410
 411         mutex_lock(&bus->device_lock);
 412         /* we need to connect to INFO GUID */
 413         cl = mei_cl_alloc_linked(bus);
 414         if (IS_ERR(cl)) {
 415                 ret = PTR_ERR(cl);
 416                 cl = NULL;
 417                 dev_err(bus->dev, "nfc hook alloc failed %d\n", ret);
 418                 goto out;
 419         }
 420
 421         me_cl = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid);
 422         if (!me_cl) {
 423                 ret = -ENOTTY;
 424                 dev_err(bus->dev, "Cannot find nfc info %d\n", ret);
 425                 goto out;
 426         }
 427
 428         ret = mei_cl_connect(cl, me_cl, NULL);
 429         if (ret < 0) {
 430                 dev_err(&cldev->dev, "Can't connect to the NFC INFO ME ret = %d\n",
 431                         ret);
 432                 goto out;
 433         }
 434
 435         mutex_unlock(&bus->device_lock);
 436
 437         ret = mei_nfc_if_version(cl, &ver);
 438         if (ret)
 439                 goto disconnect;
 440
 441         radio_name = mei_nfc_radio_name(&ver);
 442
 443         if (!radio_name) {
 444                 ret = -ENOENT;
 445                 dev_err(&cldev->dev, "Can't get the NFC interface version ret = %d\n",
 446                         ret);
 447                 goto disconnect;
 448         }
 449
 450         dev_dbg(bus->dev, "nfc radio %s\n", radio_name);
 451         strlcpy(cldev->name, radio_name, sizeof(cldev->name));
 452
 453 disconnect:
 454         mutex_lock(&bus->device_lock);
 455         if (mei_cl_disconnect(cl) < 0)
 456                 dev_err(bus->dev, "Can't disconnect the NFC INFO ME\n");
 457
 458         mei_cl_flush_queues(cl, NULL);
 459
 460 out:
 461         mei_cl_unlink(cl);
 462         mutex_unlock(&bus->device_lock);
 463         mei_me_cl_put(me_cl);
 464         kfree(cl);
 465
 466         if (ret)
 467                 cldev->do_match = 0;
 468
 469         dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match);
 470 }
 471
 472 /**
 473  * vt_support - enable on bus clients with vtag support
 474  *
 475  * @cldev: me clients device
 476  */
 477 static void vt_support(struct mei_cl_device *cldev)
 478 {
 479         if (cldev->me_cl->props.vt_supported == 1)
 480                 cldev->do_match = 1;
 481 }
 482
 483 #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
 484
 485 static struct mei_fixup {
 486
 487         const uuid_le uuid;
 488         void (*hook)(struct mei_cl_device *cldev);
 489 } mei_fixups[] = {
 490         MEI_FIXUP(MEI_UUID_ANY, number_of_connections),
 491         MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
 492         MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc),
 493         MEI_FIXUP(MEI_UUID_WD, mei_wd),
 494         MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
 495         MEI_FIXUP(MEI_UUID_HDCP, whitelist),
 496         MEI_FIXUP(MEI_UUID_ANY, vt_support),
 497         MEI_FIXUP(MEI_UUID_PAVP, whitelist),
 498 };
 499
 500 /**
 501  * mei_cldev_fixup - run fixup handlers
 502  *
 503  * @cldev: me client device
 504  */
 505 void mei_cl_bus_dev_fixup(struct mei_cl_device *cldev)
 506 {
 507         struct mei_fixup *f;
 508         const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
 509         size_t i;
 510
 511         for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) {
 512
 513                 f = &mei_fixups[i];
 514                 if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 ||
 515                     uuid_le_cmp(f->uuid, *uuid) == 0)
 516                         f->hook(cldev);
 517         }
 518 }
 519