drivers/bluetooth/btrtl.c

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