drivers/misc/mei/bus-fixup.c

   1 /*
   2  *
   3  * Intel Management Engine Interface (Intel MEI) Linux driver
   4  * Copyright (c) 2003-2013, 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 #define MKHI_FWCAPS_GROUP_ID 0x3
 100 #define MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD 6
 101 struct mkhi_msg_hdr {
 102         u8  group_id;
 103         u8  command;
 104         u8  reserved;
 105         u8  result;
 106 } __packed;
 107
 108 struct mkhi_msg {
 109         struct mkhi_msg_hdr hdr;
 110         u8 data[0];
 111 } __packed;
 112
 113 static int mei_osver(struct mei_cl_device *cldev)
 114 {
 115         int ret;
 116         const size_t size = sizeof(struct mkhi_msg_hdr) +
 117                             sizeof(struct mkhi_fwcaps) +
 118                             sizeof(struct mei_os_ver);
 119         size_t length = 8;
 120         char buf[size];
 121         struct mkhi_msg *req;
 122         struct mkhi_fwcaps *fwcaps;
 123         struct mei_os_ver *os_ver;
 124         unsigned int mode = MEI_CL_IO_TX_BLOCKING | MEI_CL_IO_TX_INTERNAL;
 125
 126         memset(buf, 0, size);
 127
 128         req = (struct mkhi_msg *)buf;
 129         req->hdr.group_id = MKHI_FWCAPS_GROUP_ID;
 130         req->hdr.command = MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD;
 131
 132         fwcaps = (struct mkhi_fwcaps *)req->data;
 133
 134         fwcaps->id.rule_type = 0x0;
 135         fwcaps->id.feature_id = MKHI_FEATURE_PTT;
 136         fwcaps->len = sizeof(*os_ver);
 137         os_ver = (struct mei_os_ver *)fwcaps->data;
 138         os_ver->os_type = OSTYPE_LINUX;
 139
 140         ret = __mei_cl_send(cldev->cl, buf, size, mode);
 141         if (ret < 0)
 142                 return ret;
 143
 144         ret = __mei_cl_recv(cldev->cl, buf, length, 0);
 145         if (ret < 0)
 146                 return ret;
 147
 148         return 0;
 149 }
 150
 151 static void mei_mkhi_fix(struct mei_cl_device *cldev)
 152 {
 153         int ret;
 154
 155         ret = mei_cldev_enable(cldev);
 156         if (ret)
 157                 return;
 158
 159         ret = mei_osver(cldev);
 160         if (ret)
 161                 dev_err(&cldev->dev, "OS version command failed %d\n", ret);
 162
 163         mei_cldev_disable(cldev);
 164 }
 165
 166 /**
 167  * mei_wd - wd client on the bus, change protocol version
 168  *   as the API has changed.
 169  *
 170  * @cldev: me clients device
 171  */
 172 #if IS_ENABLED(CONFIG_INTEL_MEI_ME)
 173 #include <linux/pci.h>
 174 #include "hw-me-regs.h"
 175 static void mei_wd(struct mei_cl_device *cldev)
 176 {
 177         struct pci_dev *pdev = to_pci_dev(cldev->dev.parent);
 178
 179         dev_dbg(&cldev->dev, "running hook %s\n", __func__);
 180         if (pdev->device == MEI_DEV_ID_WPT_LP ||
 181             pdev->device == MEI_DEV_ID_SPT ||
 182             pdev->device == MEI_DEV_ID_SPT_H)
 183                 cldev->me_cl->props.protocol_version = 0x2;
 184
 185         cldev->do_match = 1;
 186 }
 187 #else
 188 static inline void mei_wd(struct mei_cl_device *cldev) {}
 189 #endif /* CONFIG_INTEL_MEI_ME */
 190
 191 struct mei_nfc_cmd {
 192         u8 command;
 193         u8 status;
 194         u16 req_id;
 195         u32 reserved;
 196         u16 data_size;
 197         u8 sub_command;
 198         u8 data[];
 199 } __packed;
 200
 201 struct mei_nfc_reply {
 202         u8 command;
 203         u8 status;
 204         u16 req_id;
 205         u32 reserved;
 206         u16 data_size;
 207         u8 sub_command;
 208         u8 reply_status;
 209         u8 data[];
 210 } __packed;
 211
 212 struct mei_nfc_if_version {
 213         u8 radio_version_sw[3];
 214         u8 reserved[3];
 215         u8 radio_version_hw[3];
 216         u8 i2c_addr;
 217         u8 fw_ivn;
 218         u8 vendor_id;
 219         u8 radio_type;
 220 } __packed;
 221
 222
 223 #define MEI_NFC_CMD_MAINTENANCE 0x00
 224 #define MEI_NFC_SUBCMD_IF_VERSION 0x01
 225
 226 /* Vendors */
 227 #define MEI_NFC_VENDOR_INSIDE 0x00
 228 #define MEI_NFC_VENDOR_NXP    0x01
 229
 230 /* Radio types */
 231 #define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
 232 #define MEI_NFC_VENDOR_NXP_PN544    0x01
 233
 234 /**
 235  * mei_nfc_if_version - get NFC interface version
 236  *
 237  * @cl: host client (nfc info)
 238  * @ver: NFC interface version to be filled in
 239  *
 240  * Return: 0 on success; < 0 otherwise
 241  */
 242 static int mei_nfc_if_version(struct mei_cl *cl,
 243                               struct mei_nfc_if_version *ver)
 244 {
 245         struct mei_device *bus;
 246         struct mei_nfc_cmd cmd = {
 247                 .command = MEI_NFC_CMD_MAINTENANCE,
 248                 .data_size = 1,
 249                 .sub_command = MEI_NFC_SUBCMD_IF_VERSION,
 250         };
 251         struct mei_nfc_reply *reply = NULL;
 252         size_t if_version_length;
 253         int bytes_recv, ret;
 254
 255         bus = cl->dev;
 256
 257         WARN_ON(mutex_is_locked(&bus->device_lock));
 258
 259         ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd),
 260                             MEI_CL_IO_TX_BLOCKING);
 261         if (ret < 0) {
 262                 dev_err(bus->dev, "Could not send IF version cmd\n");
 263                 return ret;
 264         }
 265
 266         /* to be sure on the stack we alloc memory */
 267         if_version_length = sizeof(struct mei_nfc_reply) +
 268                 sizeof(struct mei_nfc_if_version);
 269
 270         reply = kzalloc(if_version_length, GFP_KERNEL);
 271         if (!reply)
 272                 return -ENOMEM;
 273
 274         ret = 0;
 275         bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, 0);
 276         if (bytes_recv < if_version_length) {
 277                 dev_err(bus->dev, "Could not read IF version\n");
 278                 ret = -EIO;
 279                 goto err;
 280         }
 281
 282         memcpy(ver, reply->data, sizeof(struct mei_nfc_if_version));
 283
 284         dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
 285                 ver->fw_ivn, ver->vendor_id, ver->radio_type);
 286
 287 err:
 288         kfree(reply);
 289         return ret;
 290 }
 291
 292 /**
 293  * mei_nfc_radio_name - derive nfc radio name from the interface version
 294  *
 295  * @ver: NFC radio version
 296  *
 297  * Return: radio name string
 298  */
 299 static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver)
 300 {
 301
 302         if (ver->vendor_id == MEI_NFC_VENDOR_INSIDE) {
 303                 if (ver->radio_type == MEI_NFC_VENDOR_INSIDE_UREAD)
 304                         return "microread";
 305         }
 306
 307         if (ver->vendor_id == MEI_NFC_VENDOR_NXP) {
 308                 if (ver->radio_type == MEI_NFC_VENDOR_NXP_PN544)
 309                         return "pn544";
 310         }
 311
 312         return NULL;
 313 }
 314
 315 /**
 316  * mei_nfc - The nfc fixup function. The function retrieves nfc radio
 317  *    name and set is as device attribute so we can load
 318  *    the proper device driver for it
 319  *
 320  * @cldev: me client device (nfc)
 321  */
 322 static void mei_nfc(struct mei_cl_device *cldev)
 323 {
 324         struct mei_device *bus;
 325         struct mei_cl *cl;
 326         struct mei_me_client *me_cl = NULL;
 327         struct mei_nfc_if_version ver;
 328         const char *radio_name = NULL;
 329         int ret;
 330
 331         bus = cldev->bus;
 332
 333         dev_dbg(&cldev->dev, "running hook %s\n", __func__);
 334
 335         mutex_lock(&bus->device_lock);
 336         /* we need to connect to INFO GUID */
 337         cl = mei_cl_alloc_linked(bus);
 338         if (IS_ERR(cl)) {
 339                 ret = PTR_ERR(cl);
 340                 cl = NULL;
 341                 dev_err(bus->dev, "nfc hook alloc failed %d\n", ret);
 342                 goto out;
 343         }
 344
 345         me_cl = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid);
 346         if (!me_cl) {
 347                 ret = -ENOTTY;
 348                 dev_err(bus->dev, "Cannot find nfc info %d\n", ret);
 349                 goto out;
 350         }
 351
 352         ret = mei_cl_connect(cl, me_cl, NULL);
 353         if (ret < 0) {
 354                 dev_err(&cldev->dev, "Can't connect to the NFC INFO ME ret = %d\n",
 355                         ret);
 356                 goto out;
 357         }
 358
 359         mutex_unlock(&bus->device_lock);
 360
 361         ret = mei_nfc_if_version(cl, &ver);
 362         if (ret)
 363                 goto disconnect;
 364
 365         radio_name = mei_nfc_radio_name(&ver);
 366
 367         if (!radio_name) {
 368                 ret = -ENOENT;
 369                 dev_err(&cldev->dev, "Can't get the NFC interface version ret = %d\n",
 370                         ret);
 371                 goto disconnect;
 372         }
 373
 374         dev_dbg(bus->dev, "nfc radio %s\n", radio_name);
 375         strlcpy(cldev->name, radio_name, sizeof(cldev->name));
 376
 377 disconnect:
 378         mutex_lock(&bus->device_lock);
 379         if (mei_cl_disconnect(cl) < 0)
 380                 dev_err(bus->dev, "Can't disconnect the NFC INFO ME\n");
 381
 382         mei_cl_flush_queues(cl, NULL);
 383
 384 out:
 385         mei_cl_unlink(cl);
 386         mutex_unlock(&bus->device_lock);
 387         mei_me_cl_put(me_cl);
 388         kfree(cl);
 389
 390         if (ret)
 391                 cldev->do_match = 0;
 392
 393         dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match);
 394 }
 395
 396 #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
 397
 398 static struct mei_fixup {
 399
 400         const uuid_le uuid;
 401         void (*hook)(struct mei_cl_device *cldev);
 402 } mei_fixups[] = {
 403         MEI_FIXUP(MEI_UUID_ANY, number_of_connections),
 404         MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
 405         MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc),
 406         MEI_FIXUP(MEI_UUID_WD, mei_wd),
 407         MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
 408 };
 409
 410 /**
 411  * mei_cldev_fixup - run fixup handlers
 412  *
 413  * @cldev: me client device
 414  */
 415 void mei_cl_bus_dev_fixup(struct mei_cl_device *cldev)
 416 {
 417         struct mei_fixup *f;
 418         const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
 419         int i;
 420
 421         for (i = 0; i < ARRAY_SIZE(mei_fixups); i++) {
 422
 423                 f = &mei_fixups[i];
 424                 if (uuid_le_cmp(f->uuid, MEI_UUID_ANY) == 0 ||
 425                     uuid_le_cmp(f->uuid, *uuid) == 0)
 426                         f->hook(cldev);
 427         }
 428 }
 429