drivers/bluetooth/btrtl.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Bluetooth support for Realtek devices
   4  *
   5  *  Copyright (C) 2015 Endless Mobile, Inc.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/firmware.h>
  10 #include <asm/unaligned.h>
  11 #include <linux/usb.h>
  12
  13 #include <net/bluetooth/bluetooth.h>
  14 #include <net/bluetooth/hci_core.h>
  15
  16 #include "btrtl.h"
  17
  18 #define VERSION "0.1"
  19
  20 #define RTL_EPATCH_SIGNATURE    "Realtech"
  21 #define RTL_ROM_LMP_3499        0x3499
  22 #define RTL_ROM_LMP_8723A       0x1200
  23 #define RTL_ROM_LMP_8723B       0x8723
  24 #define RTL_ROM_LMP_8723D       0x8873
  25 #define RTL_ROM_LMP_8821A       0x8821
  26 #define RTL_ROM_LMP_8761A       0x8761
  27 #define RTL_ROM_LMP_8822B       0x8822
  28 #define RTL_CONFIG_MAGIC        0x8723ab55
  29
  30 #define IC_MATCH_FL_LMPSUBV     (1 << 0)
  31 #define IC_MATCH_FL_HCIREV      (1 << 1)
  32 #define IC_MATCH_FL_HCIVER      (1 << 2)
  33 #define IC_MATCH_FL_HCIBUS      (1 << 3)
  34 #define IC_INFO(lmps, hcir) \
  35         .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_HCIREV, \
  36         .lmp_subver = (lmps), \
  37         .hci_rev = (hcir)
  38
  39 struct id_table {
  40         __u16 match_flags;
  41         __u16 lmp_subver;
  42         __u16 hci_rev;
  43         __u8 hci_ver;
  44         __u8 hci_bus;
  45         bool config_needed;
  46         bool has_rom_version;
  47         char *fw_name;
  48         char *cfg_name;
  49 };
  50
  51 struct btrtl_device_info {
  52         const struct id_table *ic_info;
  53         u8 rom_version;
  54         u8 *fw_data;
  55         int fw_len;
  56         u8 *cfg_data;
  57         int cfg_len;
  58 };
  59
  60 static const struct id_table ic_id_table[] = {
  61         { IC_MATCH_FL_LMPSUBV, RTL_ROM_LMP_8723A, 0x0,
  62           .config_needed = false,
  63           .has_rom_version = false,
  64           .fw_name = "rtl_bt/rtl8723a_fw.bin",
  65           .cfg_name = NULL },
  66
  67         { IC_MATCH_FL_LMPSUBV, RTL_ROM_LMP_3499, 0x0,
  68           .config_needed = false,
  69           .has_rom_version = false,
  70           .fw_name = "rtl_bt/rtl8723a_fw.bin",
  71           .cfg_name = NULL },
  72
  73         /* 8723BS */
  74         { .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_HCIREV |
  75                          IC_MATCH_FL_HCIVER | IC_MATCH_FL_HCIBUS,
  76           .lmp_subver = RTL_ROM_LMP_8723B,
  77           .hci_rev = 0xb,
  78           .hci_ver = 6,
  79           .hci_bus = HCI_UART,
  80           .config_needed = true,
  81           .has_rom_version = true,
  82           .fw_name  = "rtl_bt/rtl8723bs_fw.bin",
  83           .cfg_name = "rtl_bt/rtl8723bs_config" },
  84
  85         /* 8723B */
  86         { IC_INFO(RTL_ROM_LMP_8723B, 0xb),
  87           .config_needed = false,
  88           .has_rom_version = true,
  89           .fw_name  = "rtl_bt/rtl8723b_fw.bin",
  90           .cfg_name = "rtl_bt/rtl8723b_config" },
  91
  92         /* 8723D */
  93         { IC_INFO(RTL_ROM_LMP_8723B, 0xd),
  94           .config_needed = true,
  95           .has_rom_version = true,
  96           .fw_name  = "rtl_bt/rtl8723d_fw.bin",
  97           .cfg_name = "rtl_bt/rtl8723d_config" },
  98
  99         /* 8723DS */
 100         { .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_HCIREV |
 101                          IC_MATCH_FL_HCIVER | IC_MATCH_FL_HCIBUS,
 102           .lmp_subver = RTL_ROM_LMP_8723B,
 103           .hci_rev = 0xd,
 104           .hci_ver = 8,
 105           .hci_bus = HCI_UART,
 106           .config_needed = true,
 107           .has_rom_version = true,
 108           .fw_name  = "rtl_bt/rtl8723ds_fw.bin",
 109           .cfg_name = "rtl_bt/rtl8723ds_config" },
 110
 111         /* 8723DU */
 112         { IC_INFO(RTL_ROM_LMP_8723D, 0x826C),
 113           .config_needed = true,
 114           .has_rom_version = true,
 115           .fw_name  = "rtl_bt/rtl8723d_fw.bin",
 116           .cfg_name = "rtl_bt/rtl8723d_config" },
 117
 118         /* 8821A */
 119         { IC_INFO(RTL_ROM_LMP_8821A, 0xa),
 120           .config_needed = false,
 121           .has_rom_version = true,
 122           .fw_name  = "rtl_bt/rtl8821a_fw.bin",
 123           .cfg_name = "rtl_bt/rtl8821a_config" },
 124
 125         /* 8821C */
 126         { IC_INFO(RTL_ROM_LMP_8821A, 0xc),
 127           .config_needed = false,
 128           .has_rom_version = true,
 129           .fw_name  = "rtl_bt/rtl8821c_fw.bin",
 130           .cfg_name = "rtl_bt/rtl8821c_config" },
 131
 132         /* 8761A */
 133         { IC_MATCH_FL_LMPSUBV, RTL_ROM_LMP_8761A, 0x0,
 134           .config_needed = false,
 135           .has_rom_version = true,
 136           .fw_name  = "rtl_bt/rtl8761a_fw.bin",
 137           .cfg_name = "rtl_bt/rtl8761a_config" },
 138
 139         /* 8822C with USB interface */
 140         { IC_INFO(RTL_ROM_LMP_8822B, 0xc),
 141           .config_needed = false,
 142           .has_rom_version = true,
 143           .fw_name  = "rtl_bt/rtl8822cu_fw.bin",
 144           .cfg_name = "rtl_bt/rtl8822cu_config" },
 145
 146         /* 8822B */
 147         { IC_INFO(RTL_ROM_LMP_8822B, 0xb),
 148           .config_needed = true,
 149           .has_rom_version = true,
 150           .fw_name  = "rtl_bt/rtl8822b_fw.bin",
 151           .cfg_name = "rtl_bt/rtl8822b_config" },
 152         };
 153
 154 static const struct id_table *btrtl_match_ic(u16 lmp_subver, u16 hci_rev,
 155                                              u8 hci_ver, u8 hci_bus)
 156 {
 157         int i;
 158
 159         for (i = 0; i < ARRAY_SIZE(ic_id_table); i++) {
 160                 if ((ic_id_table[i].match_flags & IC_MATCH_FL_LMPSUBV) &&
 161                     (ic_id_table[i].lmp_subver != lmp_subver))
 162                         continue;
 163                 if ((ic_id_table[i].match_flags & IC_MATCH_FL_HCIREV) &&
 164                     (ic_id_table[i].hci_rev != hci_rev))
 165                         continue;
 166                 if ((ic_id_table[i].match_flags & IC_MATCH_FL_HCIVER) &&
 167                     (ic_id_table[i].hci_ver != hci_ver))
 168                         continue;
 169                 if ((ic_id_table[i].match_flags & IC_MATCH_FL_HCIBUS) &&
 170                     (ic_id_table[i].hci_bus != hci_bus))
 171                         continue;
 172
 173                 break;
 174         }
 175         if (i >= ARRAY_SIZE(ic_id_table))
 176                 return NULL;
 177
 178         return &ic_id_table[i];
 179 }
 180
 181 static struct sk_buff *btrtl_read_local_version(struct hci_dev *hdev)
 182 {
 183         struct sk_buff *skb;
 184
 185         skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
 186                              HCI_INIT_TIMEOUT);
 187         if (IS_ERR(skb)) {
 188                 rtl_dev_err(hdev, "HCI_OP_READ_LOCAL_VERSION failed (%ld)",
 189                             PTR_ERR(skb));
 190                 return skb;
 191         }
 192
 193         if (skb->len != sizeof(struct hci_rp_read_local_version)) {
 194                 rtl_dev_err(hdev, "HCI_OP_READ_LOCAL_VERSION event length mismatch");
 195                 kfree_skb(skb);
 196                 return ERR_PTR(-EIO);
 197         }
 198
 199         return skb;
 200 }
 201
 202 static int rtl_read_rom_version(struct hci_dev *hdev, u8 *version)
 203 {
 204         struct rtl_rom_version_evt *rom_version;
 205         struct sk_buff *skb;
 206
 207         /* Read RTL ROM version command */
 208         skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
 209         if (IS_ERR(skb)) {
 210                 rtl_dev_err(hdev, "Read ROM version failed (%ld)",
 211                             PTR_ERR(skb));
 212                 return PTR_ERR(skb);
 213         }
 214
 215         if (skb->len != sizeof(*rom_version)) {
 216                 rtl_dev_err(hdev, "version event length mismatch");
 217                 kfree_skb(skb);
 218                 return -EIO;
 219         }
 220
 221         rom_version = (struct rtl_rom_version_evt *)skb->data;
 222         rtl_dev_info(hdev, "rom_version status=%x version=%x",
 223                      rom_version->status, rom_version->version);
 224
 225         *version = rom_version->version;
 226
 227         kfree_skb(skb);
 228         return 0;
 229 }
 230
 231 static int rtlbt_parse_firmware(struct hci_dev *hdev,
 232                                 struct btrtl_device_info *btrtl_dev,
 233                                 unsigned char **_buf)
 234 {
 235         static const u8 extension_sig[] = { 0x51, 0x04, 0xfd, 0x77 };
 236         struct rtl_epatch_header *epatch_info;
 237         unsigned char *buf;
 238         int i, len;
 239         size_t min_size;
 240         u8 opcode, length, data;
 241         int project_id = -1;
 242         const unsigned char *fwptr, *chip_id_base;
 243         const unsigned char *patch_length_base, *patch_offset_base;
 244         u32 patch_offset = 0;
 245         u16 patch_length, num_patches;
 246         static const struct {
 247                 __u16 lmp_subver;
 248                 __u8 id;
 249         } project_id_to_lmp_subver[] = {
 250                 { RTL_ROM_LMP_8723A, 0 },
 251                 { RTL_ROM_LMP_8723B, 1 },
 252                 { RTL_ROM_LMP_8821A, 2 },
 253                 { RTL_ROM_LMP_8761A, 3 },
 254                 { RTL_ROM_LMP_8822B, 8 },
 255                 { RTL_ROM_LMP_8723B, 9 },       /* 8723D */
 256                 { RTL_ROM_LMP_8821A, 10 },      /* 8821C */
 257                 { RTL_ROM_LMP_8822B, 13 },      /* 8822C */
 258         };
 259
 260         min_size = sizeof(struct rtl_epatch_header) + sizeof(extension_sig) + 3;
 261         if (btrtl_dev->fw_len < min_size)
 262                 return -EINVAL;
 263
 264         fwptr = btrtl_dev->fw_data + btrtl_dev->fw_len - sizeof(extension_sig);
 265         if (memcmp(fwptr, extension_sig, sizeof(extension_sig)) != 0) {
 266                 rtl_dev_err(hdev, "extension section signature mismatch");
 267                 return -EINVAL;
 268         }
 269
 270         /* Loop from the end of the firmware parsing instructions, until
 271          * we find an instruction that identifies the "project ID" for the
 272          * hardware supported by this firwmare file.
 273          * Once we have that, we double-check that that project_id is suitable
 274          * for the hardware we are working with.
 275          */
 276         while (fwptr >= btrtl_dev->fw_data + (sizeof(*epatch_info) + 3)) {
 277                 opcode = *--fwptr;
 278                 length = *--fwptr;
 279                 data = *--fwptr;
 280
 281                 BT_DBG("check op=%x len=%x data=%x", opcode, length, data);
 282
 283                 if (opcode == 0xff) /* EOF */
 284                         break;
 285
 286                 if (length == 0) {
 287                         rtl_dev_err(hdev, "found instruction with length 0");
 288                         return -EINVAL;
 289                 }
 290
 291                 if (opcode == 0 && length == 1) {
 292                         project_id = data;
 293                         break;
 294                 }
 295
 296                 fwptr -= length;
 297         }
 298
 299         if (project_id < 0) {
 300                 rtl_dev_err(hdev, "failed to find version instruction");
 301                 return -EINVAL;
 302         }
 303
 304         /* Find project_id in table */
 305         for (i = 0; i < ARRAY_SIZE(project_id_to_lmp_subver); i++) {
 306                 if (project_id == project_id_to_lmp_subver[i].id)
 307                         break;
 308         }
 309
 310         if (i >= ARRAY_SIZE(project_id_to_lmp_subver)) {
 311                 rtl_dev_err(hdev, "unknown project id %d", project_id);
 312                 return -EINVAL;
 313         }
 314
 315         if (btrtl_dev->ic_info->lmp_subver !=
 316                                 project_id_to_lmp_subver[i].lmp_subver) {
 317                 rtl_dev_err(hdev, "firmware is for %x but this is a %x",
 318                             project_id_to_lmp_subver[i].lmp_subver,
 319                             btrtl_dev->ic_info->lmp_subver);
 320                 return -EINVAL;
 321         }
 322
 323         epatch_info = (struct rtl_epatch_header *)btrtl_dev->fw_data;
 324         if (memcmp(epatch_info->signature, RTL_EPATCH_SIGNATURE, 8) != 0) {
 325                 rtl_dev_err(hdev, "bad EPATCH signature");
 326                 return -EINVAL;
 327         }
 328
 329         num_patches = le16_to_cpu(epatch_info->num_patches);
 330         BT_DBG("fw_version=%x, num_patches=%d",
 331                le32_to_cpu(epatch_info->fw_version), num_patches);
 332
 333         /* After the rtl_epatch_header there is a funky patch metadata section.
 334          * Assuming 2 patches, the layout is:
 335          * ChipID1 ChipID2 PatchLength1 PatchLength2 PatchOffset1 PatchOffset2
 336          *
 337          * Find the right patch for this chip.
 338          */
 339         min_size += 8 * num_patches;
 340         if (btrtl_dev->fw_len < min_size)
 341                 return -EINVAL;
 342
 343         chip_id_base = btrtl_dev->fw_data + sizeof(struct rtl_epatch_header);
 344         patch_length_base = chip_id_base + (sizeof(u16) * num_patches);
 345         patch_offset_base = patch_length_base + (sizeof(u16) * num_patches);
 346         for (i = 0; i < num_patches; i++) {
 347                 u16 chip_id = get_unaligned_le16(chip_id_base +
 348                                                  (i * sizeof(u16)));
 349                 if (chip_id == btrtl_dev->rom_version + 1) {
 350                         patch_length = get_unaligned_le16(patch_length_base +
 351                                                           (i * sizeof(u16)));
 352                         patch_offset = get_unaligned_le32(patch_offset_base +
 353                                                           (i * sizeof(u32)));
 354                         break;
 355                 }
 356         }
 357
 358         if (!patch_offset) {
 359                 rtl_dev_err(hdev, "didn't find patch for chip id %d",
 360                             btrtl_dev->rom_version);
 361                 return -EINVAL;
 362         }
 363
 364         BT_DBG("length=%x offset=%x index %d", patch_length, patch_offset, i);
 365         min_size = patch_offset + patch_length;
 366         if (btrtl_dev->fw_len < min_size)
 367                 return -EINVAL;
 368
 369         /* Copy the firmware into a new buffer and write the version at
 370          * the end.
 371          */
 372         len = patch_length;
 373         buf = kmemdup(btrtl_dev->fw_data + patch_offset, patch_length,
 374                       GFP_KERNEL);
 375         if (!buf)
 376                 return -ENOMEM;
 377
 378         memcpy(buf + patch_length - 4, &epatch_info->fw_version, 4);
 379
 380         *_buf = buf;
 381         return len;
 382 }
 383
 384 static int rtl_download_firmware(struct hci_dev *hdev,
 385                                  const unsigned char *data, int fw_len)
 386 {
 387         struct rtl_download_cmd *dl_cmd;
 388         int frag_num = fw_len / RTL_FRAG_LEN + 1;
 389         int frag_len = RTL_FRAG_LEN;
 390         int ret = 0;
 391         int i;
 392         struct sk_buff *skb;
 393         struct hci_rp_read_local_version *rp;
 394
 395         dl_cmd = kmalloc(sizeof(struct rtl_download_cmd), GFP_KERNEL);
 396         if (!dl_cmd)
 397                 return -ENOMEM;
 398
 399         for (i = 0; i < frag_num; i++) {
 400                 struct sk_buff *skb;
 401
 402                 BT_DBG("download fw (%d/%d)", i, frag_num);
 403
 404                 if (i > 0x7f)
 405                         dl_cmd->index = (i & 0x7f) + 1;
 406                 else
 407                         dl_cmd->index = i;
 408
 409                 if (i == (frag_num - 1)) {
 410                         dl_cmd->index |= 0x80; /* data end */
 411                         frag_len = fw_len % RTL_FRAG_LEN;
 412                 }
 413                 memcpy(dl_cmd->data, data, frag_len);
 414
 415                 /* Send download command */
 416                 skb = __hci_cmd_sync(hdev, 0xfc20, frag_len + 1, dl_cmd,
 417                                      HCI_INIT_TIMEOUT);
 418                 if (IS_ERR(skb)) {
 419                         rtl_dev_err(hdev, "download fw command failed (%ld)",
 420                                     PTR_ERR(skb));
 421                         ret = -PTR_ERR(skb);
 422                         goto out;
 423                 }
 424
 425                 if (skb->len != sizeof(struct rtl_download_response)) {
 426                         rtl_dev_err(hdev, "download fw event length mismatch");
 427                         kfree_skb(skb);
 428                         ret = -EIO;
 429                         goto out;
 430                 }
 431
 432                 kfree_skb(skb);
 433                 data += RTL_FRAG_LEN;
 434         }
 435
 436         skb = btrtl_read_local_version(hdev);
 437         if (IS_ERR(skb)) {
 438                 ret = PTR_ERR(skb);
 439                 rtl_dev_err(hdev, "read local version failed");
 440                 goto out;
 441         }
 442
 443         rp = (struct hci_rp_read_local_version *)skb->data;
 444         rtl_dev_info(hdev, "fw version 0x%04x%04x",
 445                      __le16_to_cpu(rp->hci_rev), __le16_to_cpu(rp->lmp_subver));
 446         kfree_skb(skb);
 447
 448 out:
 449         kfree(dl_cmd);
 450         return ret;
 451 }
 452
 453 static int rtl_load_file(struct hci_dev *hdev, const char *name, u8 **buff)
 454 {
 455         const struct firmware *fw;
 456         int ret;
 457
 458         rtl_dev_info(hdev, "loading %s", name);
 459         ret = request_firmware(&fw, name, &hdev->dev);
 460         if (ret < 0)
 461                 return ret;
 462         ret = fw->size;
 463         *buff = kmemdup(fw->data, ret, GFP_KERNEL);
 464         if (!*buff)
 465                 ret = -ENOMEM;
 466
 467         release_firmware(fw);
 468
 469         return ret;
 470 }
 471
 472 static int btrtl_setup_rtl8723a(struct hci_dev *hdev,
 473                                 struct btrtl_device_info *btrtl_dev)
 474 {
 475         if (btrtl_dev->fw_len < 8)
 476                 return -EINVAL;
 477
 478         /* Check that the firmware doesn't have the epatch signature
 479          * (which is only for RTL8723B and newer).
 480          */
 481         if (!memcmp(btrtl_dev->fw_data, RTL_EPATCH_SIGNATURE, 8)) {
 482                 rtl_dev_err(hdev, "unexpected EPATCH signature!");
 483                 return -EINVAL;
 484         }
 485
 486         return rtl_download_firmware(hdev, btrtl_dev->fw_data,
 487                                      btrtl_dev->fw_len);
 488 }
 489
 490 static int btrtl_setup_rtl8723b(struct hci_dev *hdev,
 491                                 struct btrtl_device_info *btrtl_dev)
 492 {
 493         unsigned char *fw_data = NULL;
 494         int ret;
 495         u8 *tbuff;
 496
 497         ret = rtlbt_parse_firmware(hdev, btrtl_dev, &fw_data);
 498         if (ret < 0)
 499                 goto out;
 500
 501         if (btrtl_dev->cfg_len > 0) {
 502                 tbuff = kzalloc(ret + btrtl_dev->cfg_len, GFP_KERNEL);
 503                 if (!tbuff) {
 504                         ret = -ENOMEM;
 505                         goto out;
 506                 }
 507
 508                 memcpy(tbuff, fw_data, ret);
 509                 kfree(fw_data);
 510
 511                 memcpy(tbuff + ret, btrtl_dev->cfg_data, btrtl_dev->cfg_len);
 512                 ret += btrtl_dev->cfg_len;
 513
 514                 fw_data = tbuff;
 515         }
 516
 517         rtl_dev_info(hdev, "cfg_sz %d, total sz %d", btrtl_dev->cfg_len, ret);
 518
 519         ret = rtl_download_firmware(hdev, fw_data, ret);
 520
 521 out:
 522         kfree(fw_data);
 523         return ret;
 524 }
 525
 526 void btrtl_free(struct btrtl_device_info *btrtl_dev)
 527 {
 528         kfree(btrtl_dev->fw_data);
 529         kfree(btrtl_dev->cfg_data);
 530         kfree(btrtl_dev);
 531 }
 532 EXPORT_SYMBOL_GPL(btrtl_free);
 533
 534 struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 535                                            const char *postfix)
 536 {
 537         struct btrtl_device_info *btrtl_dev;
 538         struct sk_buff *skb;
 539         struct hci_rp_read_local_version *resp;
 540         char cfg_name[40];
 541         u16 hci_rev, lmp_subver;
 542         u8 hci_ver;
 543         int ret;
 544
 545         btrtl_dev = kzalloc(sizeof(*btrtl_dev), GFP_KERNEL);
 546         if (!btrtl_dev) {
 547                 ret = -ENOMEM;
 548                 goto err_alloc;
 549         }
 550
 551         skb = btrtl_read_local_version(hdev);
 552         if (IS_ERR(skb)) {
 553                 ret = PTR_ERR(skb);
 554                 goto err_free;
 555         }
 556
 557         resp = (struct hci_rp_read_local_version *)skb->data;
 558         rtl_dev_info(hdev, "examining hci_ver=%02x hci_rev=%04x lmp_ver=%02x lmp_subver=%04x",
 559                      resp->hci_ver, resp->hci_rev,
 560                      resp->lmp_ver, resp->lmp_subver);
 561
 562         hci_ver = resp->hci_ver;
 563         hci_rev = le16_to_cpu(resp->hci_rev);
 564         lmp_subver = le16_to_cpu(resp->lmp_subver);
 565         kfree_skb(skb);
 566
 567         btrtl_dev->ic_info = btrtl_match_ic(lmp_subver, hci_rev, hci_ver,
 568                                             hdev->bus);
 569
 570         if (!btrtl_dev->ic_info) {
 571                 rtl_dev_info(hdev, "unknown IC info, lmp subver %04x, hci rev %04x, hci ver %04x",
 572                             lmp_subver, hci_rev, hci_ver);
 573                 return btrtl_dev;
 574         }
 575
 576         if (btrtl_dev->ic_info->has_rom_version) {
 577                 ret = rtl_read_rom_version(hdev, &btrtl_dev->rom_version);
 578                 if (ret)
 579                         goto err_free;
 580         }
 581
 582         btrtl_dev->fw_len = rtl_load_file(hdev, btrtl_dev->ic_info->fw_name,
 583                                           &btrtl_dev->fw_data);
 584         if (btrtl_dev->fw_len < 0) {
 585                 rtl_dev_err(hdev, "firmware file %s not found",
 586                             btrtl_dev->ic_info->fw_name);
 587                 ret = btrtl_dev->fw_len;
 588                 goto err_free;
 589         }
 590
 591         if (btrtl_dev->ic_info->cfg_name) {
 592                 if (postfix) {
 593                         snprintf(cfg_name, sizeof(cfg_name), "%s-%s.bin",
 594                                  btrtl_dev->ic_info->cfg_name, postfix);
 595                 } else {
 596                         snprintf(cfg_name, sizeof(cfg_name), "%s.bin",
 597                                  btrtl_dev->ic_info->cfg_name);
 598                 }
 599                 btrtl_dev->cfg_len = rtl_load_file(hdev, cfg_name,
 600                                                    &btrtl_dev->cfg_data);
 601                 if (btrtl_dev->ic_info->config_needed &&
 602                     btrtl_dev->cfg_len <= 0) {
 603                         rtl_dev_err(hdev, "mandatory config file %s not found",
 604                                     btrtl_dev->ic_info->cfg_name);
 605                         ret = btrtl_dev->cfg_len;
 606                         goto err_free;
 607                 }
 608         }
 609
 610         return btrtl_dev;
 611
 612 err_free:
 613         btrtl_free(btrtl_dev);
 614 err_alloc:
 615         return ERR_PTR(ret);
 616 }
 617 EXPORT_SYMBOL_GPL(btrtl_initialize);
 618
 619 int btrtl_download_firmware(struct hci_dev *hdev,
 620                             struct btrtl_device_info *btrtl_dev)
 621 {
 622         /* Match a set of subver values that correspond to stock firmware,
 623          * which is not compatible with standard btusb.
 624          * If matched, upload an alternative firmware that does conform to
 625          * standard btusb. Once that firmware is uploaded, the subver changes
 626          * to a different value.
 627          */
 628         if (!btrtl_dev->ic_info) {
 629                 rtl_dev_info(hdev, "assuming no firmware upload needed");
 630                 return 0;
 631         }
 632
 633         switch (btrtl_dev->ic_info->lmp_subver) {
 634         case RTL_ROM_LMP_8723A:
 635         case RTL_ROM_LMP_3499:
 636                 return btrtl_setup_rtl8723a(hdev, btrtl_dev);
 637         case RTL_ROM_LMP_8723B:
 638         case RTL_ROM_LMP_8821A:
 639         case RTL_ROM_LMP_8761A:
 640         case RTL_ROM_LMP_8822B:
 641                 return btrtl_setup_rtl8723b(hdev, btrtl_dev);
 642         default:
 643                 rtl_dev_info(hdev, "assuming no firmware upload needed");
 644                 return 0;
 645         }
 646 }
 647 EXPORT_SYMBOL_GPL(btrtl_download_firmware);
 648
 649 int btrtl_setup_realtek(struct hci_dev *hdev)
 650 {
 651         struct btrtl_device_info *btrtl_dev;
 652         int ret;
 653
 654         btrtl_dev = btrtl_initialize(hdev, NULL);
 655         if (IS_ERR(btrtl_dev))
 656                 return PTR_ERR(btrtl_dev);
 657
 658         ret = btrtl_download_firmware(hdev, btrtl_dev);
 659
 660         btrtl_free(btrtl_dev);
 661
 662         /* Enable controller to do both LE scan and BR/EDR inquiry
 663          * simultaneously.
 664          */
 665         set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
 666
 667         return ret;
 668 }
 669 EXPORT_SYMBOL_GPL(btrtl_setup_realtek);
 670
 671 int btrtl_shutdown_realtek(struct hci_dev *hdev)
 672 {
 673         struct sk_buff *skb;
 674         int ret;
 675
 676         /* According to the vendor driver, BT must be reset on close to avoid
 677          * firmware crash.
 678          */
 679         skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
 680         if (IS_ERR(skb)) {
 681                 ret = PTR_ERR(skb);
 682                 bt_dev_err(hdev, "HCI reset during shutdown failed");
 683                 return ret;
 684         }
 685         kfree_skb(skb);
 686
 687         return 0;
 688 }
 689 EXPORT_SYMBOL_GPL(btrtl_shutdown_realtek);
 690
 691 static unsigned int btrtl_convert_baudrate(u32 device_baudrate)
 692 {
 693         switch (device_baudrate) {
 694         case 0x0252a00a:
 695                 return 230400;
 696
 697         case 0x05f75004:
 698                 return 921600;
 699
 700         case 0x00005004:
 701                 return 1000000;
 702
 703         case 0x04928002:
 704         case 0x01128002:
 705                 return 1500000;
 706
 707         case 0x00005002:
 708                 return 2000000;
 709
 710         case 0x0000b001:
 711                 return 2500000;
 712
 713         case 0x04928001:
 714                 return 3000000;
 715
 716         case 0x052a6001:
 717                 return 3500000;
 718
 719         case 0x00005001:
 720                 return 4000000;
 721
 722         case 0x0252c014:
 723         default:
 724                 return 115200;
 725         }
 726 }
 727
 728 int btrtl_get_uart_settings(struct hci_dev *hdev,
 729                             struct btrtl_device_info *btrtl_dev,
 730                             unsigned int *controller_baudrate,
 731                             u32 *device_baudrate, bool *flow_control)
 732 {
 733         struct rtl_vendor_config *config;
 734         struct rtl_vendor_config_entry *entry;
 735         int i, total_data_len;
 736         bool found = false;
 737
 738         total_data_len = btrtl_dev->cfg_len - sizeof(*config);
 739         if (total_data_len <= 0) {
 740                 rtl_dev_warn(hdev, "no config loaded");
 741                 return -EINVAL;
 742         }
 743
 744         config = (struct rtl_vendor_config *)btrtl_dev->cfg_data;
 745         if (le32_to_cpu(config->signature) != RTL_CONFIG_MAGIC) {
 746                 rtl_dev_err(hdev, "invalid config magic");
 747                 return -EINVAL;
 748         }
 749
 750         if (total_data_len < le16_to_cpu(config->total_len)) {
 751                 rtl_dev_err(hdev, "config is too short");
 752                 return -EINVAL;
 753         }
 754
 755         for (i = 0; i < total_data_len; ) {
 756                 entry = ((void *)config->entry) + i;
 757
 758                 switch (le16_to_cpu(entry->offset)) {
 759                 case 0xc:
 760                         if (entry->len < sizeof(*device_baudrate)) {
 761                                 rtl_dev_err(hdev, "invalid UART config entry");
 762                                 return -EINVAL;
 763                         }
 764
 765                         *device_baudrate = get_unaligned_le32(entry->data);
 766                         *controller_baudrate = btrtl_convert_baudrate(
 767                                                         *device_baudrate);
 768
 769                         if (entry->len >= 13)
 770                                 *flow_control = !!(entry->data[12] & BIT(2));
 771                         else
 772                                 *flow_control = false;
 773
 774                         found = true;
 775                         break;
 776
 777                 default:
 778                         rtl_dev_dbg(hdev, "skipping config entry 0x%x (len %u)",
 779                                    le16_to_cpu(entry->offset), entry->len);
 780                         break;
 781                 };
 782
 783                 i += sizeof(*entry) + entry->len;
 784         }
 785
 786         if (!found) {
 787                 rtl_dev_err(hdev, "no UART config entry found");
 788                 return -ENOENT;
 789         }
 790
 791         rtl_dev_dbg(hdev, "device baudrate = 0x%08x", *device_baudrate);
 792         rtl_dev_dbg(hdev, "controller baudrate = %u", *controller_baudrate);
 793         rtl_dev_dbg(hdev, "flow control %d", *flow_control);
 794
 795         return 0;
 796 }
 797 EXPORT_SYMBOL_GPL(btrtl_get_uart_settings);
 798
 799 MODULE_AUTHOR("Daniel Drake <drake@endlessm.com>");
 800 MODULE_DESCRIPTION("Bluetooth support for Realtek devices ver " VERSION);
 801 MODULE_VERSION(VERSION);
 802 MODULE_LICENSE("GPL");
 803 MODULE_FIRMWARE("rtl_bt/rtl8723a_fw.bin");
 804 MODULE_FIRMWARE("rtl_bt/rtl8723b_fw.bin");
 805 MODULE_FIRMWARE("rtl_bt/rtl8723b_config.bin");
 806 MODULE_FIRMWARE("rtl_bt/rtl8723bs_fw.bin");
 807 MODULE_FIRMWARE("rtl_bt/rtl8723bs_config.bin");
 808 MODULE_FIRMWARE("rtl_bt/rtl8723ds_fw.bin");
 809 MODULE_FIRMWARE("rtl_bt/rtl8723ds_config.bin");
 810 MODULE_FIRMWARE("rtl_bt/rtl8761a_fw.bin");
 811 MODULE_FIRMWARE("rtl_bt/rtl8761a_config.bin");
 812 MODULE_FIRMWARE("rtl_bt/rtl8821a_fw.bin");
 813 MODULE_FIRMWARE("rtl_bt/rtl8821a_config.bin");
 814 MODULE_FIRMWARE("rtl_bt/rtl8822b_fw.bin");
 815 MODULE_FIRMWARE("rtl_bt/rtl8822b_config.bin");