drivers/misc/mei/bus-fixup.c

   1 /*
   2  *
   3  * Intel Management Engine Interface (Intel MEI) Linux driver
   4  * Copyright (c) 2003-2018, Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/sched.h>
  19 #include <linux/module.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/device.h>
  22 #include <linux/slab.h>
  23 #include <linux/uuid.h>
  24
  25 #include <linux/mei_cl_bus.h>
  26
  27 #include "mei_dev.h"
  28 #include "client.h"
  29
  30 #define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \
  31                         0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06)
  32
  33 static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;
  34
  35 #define MEI_UUID_NFC_HCI UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, \
  36                         0x94, 0xd4, 0x50, 0x26, 0x67, 0x23, 0x77, 0x5c)
  37
  38 #define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \
  39                             0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB)
  40
  41 #define MEI_UUID_MKHIF_FIX UUID_LE(0x55213584, 0x9a29, 0x4916, \
  42                         0xba, 0xdf, 0xf, 0xb7, 0xed, 0x68, 0x2a, 0xeb)
  43
  44 #define MEI_UUID_ANY NULL_UUID_LE
  45
  46 /**
  47  * number_of_connections - determine whether an client be on the bus
  48  *    according number of connections
  49  *    We support only clients:
  50  *       1. with single connection
  51  *       2. and fixed clients (max_number_of_connections == 0)
  52  *
  53  * @cldev: me clients device
  54  */
  55 static void number_of_connections(struct mei_cl_device *cldev)
  56 {
  57         dev_dbg(&cldev->dev, "running hook %s\n", __func__);
  58
  59         if (cldev->me_cl->props.max_number_of_connections > 1)
  60                 cldev->do_match = 0;
  61 }
  62
  63 /**
  64  * blacklist - blacklist a client from the bus
  65  *
  66  * @cldev: me clients device
  67  */
  68 static void blacklist(struct mei_cl_device *cldev)
  69 {
  70         dev_dbg(&cldev->dev, "running hook %s\n", __func__);
  71
  72         cldev->do_match = 0;
  73 }
  74
  75 #define OSTYPE_LINUX    2
  76 struct mei_os_ver {
  77         __le16 build;
  78         __le16 reserved1;
  79         u8  os_type;
  80         u8  major;
  81         u8  minor;
  82         u8  reserved2;
  83 } __packed;
  84
  85 #define MKHI_FEATURE_PTT 0x10
  86
  87 struct mkhi_rule_id {
  88         __le16 rule_type;
  89         u8 feature_id;
  90         u8 reserved;
  91 } __packed;
  92
  93 struct mkhi_fwcaps {
  94         struct mkhi_rule_id id;
  95         u8 len;
  96         u8 data[0];
  97 } __packed;
  98
  99 struct mkhi_fw_ver_block {
 100         u16 minor;
 101         u8 major;
 102         u8 platform;
 103         u16 buildno;
 104         u16 hotfix;
 105 } __packed;
 106
 107 struct mkhi_fw_ver {
 108         struct mkhi_fw_ver_block ver[MEI_MAX_FW_VER_BLOCKS];
 109 } __packed;
 110
 111 #define MKHI_FWCAPS_GROUP_ID 0x3
 112 #define MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD 6
 113 #define MKHI_GEN_GROUP_ID 0xFF
 114 #define MKHI_GEN_GET_FW_VERSION_CMD 0x2
 115 struct mkhi_msg_hdr {
 116         u8  group_id;
 117         u8  command;
 118         u8  reserved;
 119         u8  result;
 120 } __packed;
 121
 122 struct mkhi_msg {
 123         struct mkhi_msg_hdr hdr;
 124         u8 data[0];
 125 } __packed;
 126
 127 #define MKHI_OSVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
 128                             sizeof(struct mkhi_fwcaps) + \
 129                             sizeof(struct mei_os_ver))
 130 static int mei_osver(struct mei_cl_device *cldev)
 131 {
 132         const size_t size = MKHI_OSVER_BUF_LEN;
 133         char buf[MKHI_OSVER_BUF_LEN];
 134         struct mkhi_msg *req;
 135         struct mkhi_fwcaps *fwcaps;
 136         struct mei_os_ver *os_ver;
 137         unsigned int mode = MEI_CL_IO_TX_BLOCKING | MEI_CL_IO_TX_INTERNAL;
 138
 139         memset(buf, 0, size);
 140
 141         req = (struct mkhi_msg *)buf;
 142         req->hdr.group_id = MKHI_FWCAPS_GROUP_ID;
 143         req->hdr.command = MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD;
 144
 145         fwcaps = (struct mkhi_fwcaps *)req->data;
 146
 147         fwcaps->id.rule_type = 0x0;
 148         fwcaps->id.feature_id = MKHI_FEATURE_PTT;
 149         fwcaps->len = sizeof(*os_ver);
 150         os_ver = (struct mei_os_ver *)fwcaps->data;
 151         os_ver->os_type = OSTYPE_LINUX;
 152
 153         return __mei_cl_send(cldev->cl, buf, size, mode);
 154 }
 155
 156 #define MKHI_FWVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \
 157                             sizeof(struct mkhi_fw_ver))
 158 #define MKHI_FWVER_LEN(__num) (sizeof(struct mkhi_msg_hdr) + \
 159                                sizeof(struct mkhi_fw_ver_block) * (__num))
 160 #define MKHI_RCV_TIMEOUT 500 /* receive timeout in msec */
 161 static int mei_fwver(struct mei_cl_device *cldev)
 162 {
 163         char buf[MKHI_FWVER_BUF_LEN];
 164         struct mkhi_msg *req;
 165         struct mkhi_fw_ver *fwver;
 166         int bytes_recv, ret, i;
 167
 168         memset(buf, 0, sizeof(buf));
 169
 170         req = (struct mkhi_msg *)buf;
 171         req->hdr.group_id = MKHI_GEN_GROUP_ID;
 172         req->hdr.command = MKHI_GEN_GET_FW_VERSION_CMD;
 173
 174         ret = __mei_cl_send(cldev->cl, buf, sizeof(struct mkhi_msg_hdr),
 175                             MEI_CL_IO_TX_BLOCKING);
 176         if (ret < 0) {
 177                 dev_err(&cldev->dev, "Could not send ReqFWVersion cmd\n");
 178                 return ret;
 179         }
 180
 181         ret = 0;
 182         bytes_recv = __mei_cl_recv(cldev->cl, buf, sizeof(buf), 0,
 183                                    MKHI_RCV_TIMEOUT);
 184         if (bytes_recv < 0 || (size_t)bytes_recv < MKHI_FWVER_LEN(1)) {
 185                 /*
 186                  * Should be at least one version block,
 187                  * error out if nothing found
 188                  */
 189                 dev_err(&cldev->dev, "Could not read FW version\n");
 190                 return -EIO;
 191         }
 192
 193         fwver = (struct mkhi_fw_ver *)req->data;
 194         memset(cldev->bus->fw_ver, 0, sizeof(cldev->bus->fw_ver));
 195         for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) {
 196                 if ((size_t)bytes_recv < MKHI_FWVER_LEN(i + 1))
 197                         break;
 198                 dev_dbg(&cldev->dev, "FW version%d %d:%d.%d.%d.%d\n",
 199                         i, fwver->ver[i].platform,
 200                         fwver->ver[i].major, fwver->ver[i].minor,
 201                         fwver->ver[i].hotfix, fwver->ver[i].buildno);
 202
 203                 cldev->bus->fw_ver[i].platform = fwver->ver[i].platform;
 204                 cldev->bus->fw_ver[i].major = fwver->ver[i].major;
 205                 cldev->bus->fw_ver[i].minor = fwver->ver[i].minor;
 206                 cldev->bus->fw_ver[i].hotfix = fwver->ver[i].hotfix;
 207                 cldev->bus->fw_ver[i].buildno = fwver->ver[i].buildno;
 208         }
 209
 210         return ret;
 211 }
 212
 213 static void mei_mkhi_fix(struct mei_cl_device *cldev)
 214 {
 215         int ret;
 216
 217         /* No need to enable the client if nothing is needed from it */
 218         if (!cldev->bus->fw_f_fw_ver_supported &&
 219             !cldev->bus->hbm_f_os_supported)
 220                 return;
 221
 222         ret = mei_cldev_enable(cldev);
 223         if (ret)
 224                 return;
 225
 226         if (cldev->bus->fw_f_fw_ver_supported) {
 227                 ret = mei_fwver(cldev);
 228                 if (ret < 0)
 229                         dev_err(&cldev->dev, "FW version command failed %d\n",
 230                                 ret);
 231         }
 232
 233         if (cldev->bus->hbm_f_os_supported) {
 234                 ret = mei_osver(cldev);
 235                 if (ret < 0)
 236                         dev_err(&cldev->dev, "OS version command failed %d\n",
 237                                 ret);
 238         }
 239         mei_cldev_disable(cldev);
 240 }
 241
 242 /**
 243  * mei_wd - wd client on the bus, change protocol version
 244  *   as the API has changed.
 245  *
 246  * @cldev: me clients device
 247  */
 248 #if IS_ENABLED(CONFIG_INTEL_MEI_ME)
 249 #include <linux/pci.h>
 250 #include "hw-me-regs.h"
 251 static void mei_wd(struct mei_cl_device *cldev)
 252 {
 253         struct pci_dev *pdev = to_pci_dev(cldev->dev.parent);
 254
 255         dev_dbg(&cldev->dev, "running hook %s\n", __func__);
 256         if (pdev->device == MEI_DEV_ID_WPT_LP ||
 257             pdev->device == MEI_DEV_ID_SPT ||
 258             pdev->device == MEI_DEV_ID_SPT_H)
 259                 cldev->me_cl->props.protocol_version = 0x2;
 260
 261         cldev->do_match = 1;
 262 }
 263 #else
 264 static inline void mei_wd(struct mei_cl_device *cldev) {}
 265 #endif /* CONFIG_INTEL_MEI_ME */
 266
 267 struct mei_nfc_cmd {
 268         u8 command;
 269         u8 status;
 270         u16 req_id;
 271         u32 reserved;
 272         u16 data_size;
 273         u8 sub_command;
 274         u8 data[];
 275 } __packed;
 276
 277 struct mei_nfc_reply {
 278         u8 command;
 279         u8 status;
 280         u16 req_id;
 281         u32 reserved;
 282         u16 data_size;
 283         u8 sub_command;
 284         u8 reply_status;
 285         u8 data[];
 286 } __packed;
 287
 288 struct mei_nfc_if_version {
 289         u8 radio_version_sw[3];
 290         u8 reserved[3];
 291         u8 radio_version_hw[3];
 292         u8 i2c_addr;
 293         u8 fw_ivn;
 294         u8 vendor_id;
 295         u8 radio_type;
 296 } __packed;
 297
 298
 299 #define MEI_NFC_CMD_MAINTENANCE 0x00
 300 #define MEI_NFC_SUBCMD_IF_VERSION 0x01
 301
 302 /* Vendors */
 303 #define MEI_NFC_VENDOR_INSIDE 0x00
 304 #define MEI_NFC_VENDOR_NXP    0x01
 305
 306 /* Radio types */
 307 #define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
 308 #define MEI_NFC_VENDOR_NXP_PN544    0x01
 309
 310 /**
 311  * mei_nfc_if_version - get NFC interface version
 312  *
 313  * @cl: host client (nfc info)
 314  * @ver: NFC interface version to be filled in
 315  *
 316  * Return: 0 on success; < 0 otherwise
 317  */
 318 static int mei_nfc_if_version(struct mei_cl *cl,
 319                               struct mei_nfc_if_version *ver)
 320 {
 321         struct mei_device *bus;
 322         struct mei_nfc_cmd cmd = {
 323                 .command = MEI_NFC_CMD_MAINTENANCE,
 324                 .data_size = 1,
 325                 .sub_command = MEI_NFC_SUBCMD_IF_VERSION,
 326         };
 327         struct mei_nfc_reply *reply = NULL;
 328         size_t if_version_length;
 329         int bytes_recv, ret;
 330
 331         bus = cl->dev;
 332
 333         WARN_ON(mutex_is_locked(&bus->device_lock));
 334
 335         ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd),
 336                             MEI_CL_IO_TX_BLOCKING);
 337         if (ret < 0) {
 338                 dev_err(bus->dev, "Could not send IF version cmd\n");
 339                 return ret;
 340         }
 341
 342         /* to be sure on the stack we alloc memory */
 343         if_version_length = sizeof(struct mei_nfc_reply) +
 344                 sizeof(struct mei_nfc_if_version);
 345
 346         reply = kzalloc(if_version_length, GFP_KERNEL);
 347         if (!reply)
 348                 return -ENOMEM;
 349
 350         ret = 0;
 351         bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, 0, 0);
 352         if (bytes_recv < 0 || (size_t)bytes_recv < if_version_length) {
 353                 dev_err(bus->dev, "Could not read IF version\n");
 354                 ret = -EIO;
 355                 goto err;
 356         }
 357
 358         memcpy(ver, reply->data, sizeof(struct mei_nfc_if_version));
 359
 360         dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
 361                 ver->fw_ivn, ver->vendor_id, ver->radio_type);
 362
 363 err:
 364         kfree(reply);
 365         return ret;
 366 }
 367
 368 /**
 369  * mei_nfc_radio_name - derive nfc radio name from the interface version
 370  *
 371  * @ver: NFC radio version
 372  *
 373  * Return: radio name string
 374  */
 375 static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver)
 376 {
 377
 378         if (ver->vendor_id == MEI_NFC_VENDOR_INSIDE) {
 379                 if (ver->radio_type == MEI_NFC_VENDOR_INSIDE_UREAD)
 380                         return "microread";
 381         }
 382
 383         if (ver->vendor_id == MEI_NFC_VENDOR_NXP) {
 384                 if (ver->radio_type == MEI_NFC_VENDOR_NXP_PN544)
 385                         return "pn544";
 386         }
 387
 388         return NULL;
 389 }
 390
 391 /**
 392  * mei_nfc - The nfc fixup function. The function retrieves nfc radio
 393  *    name and set is as device attribute so we can load
 394  *    the proper device driver for it
 395  *
 396  * @cldev: me client device (nfc)
 397  */
 398 static void mei_nfc(struct mei_cl_device *cldev)
 399 {
 400         struct mei_device *bus;
 401         struct mei_cl *cl;
 402         struct mei_me_client *me_cl = NULL;
 403         struct mei_nfc_if_version ver;
 404         const char *radio_name = NULL;
 405         int ret;
 406
 407         bus = cldev->bus;
 408
 409         dev_dbg(&cldev->dev, "running hook %s\n", __func__);
 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 #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
 473
 474 static struct mei_fixup {
 475
 476         const uuid_le uuid;
 477         void (*hook)(struct mei_cl_device *cldev);
 478 } mei_fixups[] = {
 479         MEI_FIXUP(MEI_UUID_ANY, number_of_connections),
 480         MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
 481         MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc),
 482         MEI_FIXUP(MEI_UUID_WD, mei_wd),
 483         MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
 484 };
 485
 486 /**
 487  * mei_cldev_fixup - run fixup handlers
 488  *
 489  * @cldev: me client device
 490  */
 491 void mei_cl_bus_dev_fixup(struct mei_cl_device *cldev)
 492 {
 493         struct mei_fixup *f;
 494         const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
 495         size_t i;
 496
 497         for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) {
 498
 499                 f = &mei_fixups[i];
 500                 if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 ||
 501                     uuid_le_cmp(f->uuid, *uuid) == 0)
 502                         f->hook(cldev);
 503         }
 504 }
 505