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 38 static int rtl_read_rom_version(struct hci_dev *hdev, u8 *version) 39 { 40 struct rtl_rom_version_evt *rom_version; 41 struct sk_buff *skb; 42 43 /* Read RTL ROM version command */ 44 skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT); 45 if (IS_ERR(skb)) { 46 BT_ERR("%s: Read ROM version failed (%ld)", 47 hdev->name, PTR_ERR(skb)); 48 return PTR_ERR(skb); 49 } 50 51 if (skb->len != sizeof(*rom_version)) { 52 BT_ERR("%s: RTL version event length mismatch", hdev->name); 53 kfree_skb(skb); 54 return -EIO; 55 } 56 57 rom_version = (struct rtl_rom_version_evt *)skb->data; 58 BT_INFO("%s: rom_version status=%x version=%x", 59 hdev->name, rom_version->status, rom_version->version); 60 61 *version = rom_version->version; 62 63 kfree_skb(skb); 64 return 0; 65 } 66 67 static int rtl8723b_parse_firmware(struct hci_dev *hdev, u16 lmp_subver, 68 const struct firmware *fw, 69 unsigned char **_buf) 70 { 71 const u8 extension_sig[] = { 0x51, 0x04, 0xfd, 0x77 }; 72 struct rtl_epatch_header *epatch_info; 73 unsigned char *buf; 74 int i, ret, len; 75 size_t min_size; 76 u8 opcode, length, data, rom_version = 0; 77 int project_id = -1; 78 const unsigned char *fwptr, *chip_id_base; 79 const unsigned char *patch_length_base, *patch_offset_base; 80 u32 patch_offset = 0; 81 u16 patch_length, num_patches; 82 static const struct { 83 __u16 lmp_subver; 84 __u8 id; 85 } project_id_to_lmp_subver[] = { 86 { RTL_ROM_LMP_8723A, 0 }, 87 { RTL_ROM_LMP_8723B, 1 }, 88 { RTL_ROM_LMP_8821A, 2 }, 89 { RTL_ROM_LMP_8761A, 3 }, 90 { RTL_ROM_LMP_8822B, 8 }, 91 }; 92 93 ret = rtl_read_rom_version(hdev, &rom_version); 94 if (ret) 95 return ret; 96 97 min_size = sizeof(struct rtl_epatch_header) + sizeof(extension_sig) + 3; 98 if (fw->size < min_size) 99 return -EINVAL; 100 101 fwptr = fw->data + fw->size - sizeof(extension_sig); 102 if (memcmp(fwptr, extension_sig, sizeof(extension_sig)) != 0) { 103 BT_ERR("%s: extension section signature mismatch", hdev->name); 104 return -EINVAL; 105 } 106 107 /* Loop from the end of the firmware parsing instructions, until 108 * we find an instruction that identifies the "project ID" for the 109 * hardware supported by this firwmare file. 110 * Once we have that, we double-check that that project_id is suitable 111 * for the hardware we are working with. 112 */ 113 while (fwptr >= fw->data + (sizeof(struct rtl_epatch_header) + 3)) { 114 opcode = *--fwptr; 115 length = *--fwptr; 116 data = *--fwptr; 117 118 BT_DBG("check op=%x len=%x data=%x", opcode, length, data); 119 120 if (opcode == 0xff) /* EOF */ 121 break; 122 123 if (length == 0) { 124 BT_ERR("%s: found instruction with length 0", 125 hdev->name); 126 return -EINVAL; 127 } 128 129 if (opcode == 0 && length == 1) { 130 project_id = data; 131 break; 132 } 133 134 fwptr -= length; 135 } 136 137 if (project_id < 0) { 138 BT_ERR("%s: failed to find version instruction", hdev->name); 139 return -EINVAL; 140 } 141 142 /* Find project_id in table */ 143 for (i = 0; i < ARRAY_SIZE(project_id_to_lmp_subver); i++) { 144 if (project_id == project_id_to_lmp_subver[i].id) 145 break; 146 } 147 148 if (i >= ARRAY_SIZE(project_id_to_lmp_subver)) { 149 BT_ERR("%s: unknown project id %d", hdev->name, project_id); 150 return -EINVAL; 151 } 152 153 if (lmp_subver != project_id_to_lmp_subver[i].lmp_subver) { 154 BT_ERR("%s: firmware is for %x but this is a %x", hdev->name, 155 project_id_to_lmp_subver[i].lmp_subver, lmp_subver); 156 return -EINVAL; 157 } 158 159 epatch_info = (struct rtl_epatch_header *)fw->data; 160 if (memcmp(epatch_info->signature, RTL_EPATCH_SIGNATURE, 8) != 0) { 161 BT_ERR("%s: bad EPATCH signature", hdev->name); 162 return -EINVAL; 163 } 164 165 num_patches = le16_to_cpu(epatch_info->num_patches); 166 BT_DBG("fw_version=%x, num_patches=%d", 167 le32_to_cpu(epatch_info->fw_version), num_patches); 168 169 /* After the rtl_epatch_header there is a funky patch metadata section. 170 * Assuming 2 patches, the layout is: 171 * ChipID1 ChipID2 PatchLength1 PatchLength2 PatchOffset1 PatchOffset2 172 * 173 * Find the right patch for this chip. 174 */ 175 min_size += 8 * num_patches; 176 if (fw->size < min_size) 177 return -EINVAL; 178 179 chip_id_base = fw->data + sizeof(struct rtl_epatch_header); 180 patch_length_base = chip_id_base + (sizeof(u16) * num_patches); 181 patch_offset_base = patch_length_base + (sizeof(u16) * num_patches); 182 for (i = 0; i < num_patches; i++) { 183 u16 chip_id = get_unaligned_le16(chip_id_base + 184 (i * sizeof(u16))); 185 if (chip_id == rom_version + 1) { 186 patch_length = get_unaligned_le16(patch_length_base + 187 (i * sizeof(u16))); 188 patch_offset = get_unaligned_le32(patch_offset_base + 189 (i * sizeof(u32))); 190 break; 191 } 192 } 193 194 if (!patch_offset) { 195 BT_ERR("%s: didn't find patch for chip id %d", 196 hdev->name, rom_version); 197 return -EINVAL; 198 } 199 200 BT_DBG("length=%x offset=%x index %d", patch_length, patch_offset, i); 201 min_size = patch_offset + patch_length; 202 if (fw->size < min_size) 203 return -EINVAL; 204 205 /* Copy the firmware into a new buffer and write the version at 206 * the end. 207 */ 208 len = patch_length; 209 buf = kmemdup(fw->data + patch_offset, patch_length, GFP_KERNEL); 210 if (!buf) 211 return -ENOMEM; 212 213 memcpy(buf + patch_length - 4, &epatch_info->fw_version, 4); 214 215 *_buf = buf; 216 return len; 217 } 218 219 static int rtl_download_firmware(struct hci_dev *hdev, 220 const unsigned char *data, int fw_len) 221 { 222 struct rtl_download_cmd *dl_cmd; 223 int frag_num = fw_len / RTL_FRAG_LEN + 1; 224 int frag_len = RTL_FRAG_LEN; 225 int ret = 0; 226 int i; 227 228 dl_cmd = kmalloc(sizeof(struct rtl_download_cmd), GFP_KERNEL); 229 if (!dl_cmd) 230 return -ENOMEM; 231 232 for (i = 0; i < frag_num; i++) { 233 struct sk_buff *skb; 234 235 BT_DBG("download fw (%d/%d)", i, frag_num); 236 237 dl_cmd->index = i; 238 if (i == (frag_num - 1)) { 239 dl_cmd->index |= 0x80; /* data end */ 240 frag_len = fw_len % RTL_FRAG_LEN; 241 } 242 memcpy(dl_cmd->data, data, frag_len); 243 244 /* Send download command */ 245 skb = __hci_cmd_sync(hdev, 0xfc20, frag_len + 1, dl_cmd, 246 HCI_INIT_TIMEOUT); 247 if (IS_ERR(skb)) { 248 BT_ERR("%s: download fw command failed (%ld)", 249 hdev->name, PTR_ERR(skb)); 250 ret = -PTR_ERR(skb); 251 goto out; 252 } 253 254 if (skb->len != sizeof(struct rtl_download_response)) { 255 BT_ERR("%s: download fw event length mismatch", 256 hdev->name); 257 kfree_skb(skb); 258 ret = -EIO; 259 goto out; 260 } 261 262 kfree_skb(skb); 263 data += RTL_FRAG_LEN; 264 } 265 266 out: 267 kfree(dl_cmd); 268 return ret; 269 } 270 271 static int rtl_load_config(struct hci_dev *hdev, const char *name, u8 **buff) 272 { 273 const struct firmware *fw; 274 int ret; 275 276 BT_INFO("%s: rtl: loading %s", hdev->name, name); 277 ret = request_firmware(&fw, name, &hdev->dev); 278 if (ret < 0) { 279 BT_ERR("%s: Failed to load %s", hdev->name, name); 280 return ret; 281 } 282 283 ret = fw->size; 284 *buff = kmemdup(fw->data, ret, GFP_KERNEL); 285 286 release_firmware(fw); 287 288 return ret; 289 } 290 291 static int btrtl_setup_rtl8723a(struct hci_dev *hdev) 292 { 293 const struct firmware *fw; 294 int ret; 295 296 BT_INFO("%s: rtl: loading rtl_bt/rtl8723a_fw.bin", hdev->name); 297 ret = request_firmware(&fw, "rtl_bt/rtl8723a_fw.bin", &hdev->dev); 298 if (ret < 0) { 299 BT_ERR("%s: Failed to load rtl_bt/rtl8723a_fw.bin", hdev->name); 300 return ret; 301 } 302 303 if (fw->size < 8) { 304 ret = -EINVAL; 305 goto out; 306 } 307 308 /* Check that the firmware doesn't have the epatch signature 309 * (which is only for RTL8723B and newer). 310 */ 311 if (!memcmp(fw->data, RTL_EPATCH_SIGNATURE, 8)) { 312 BT_ERR("%s: unexpected EPATCH signature!", hdev->name); 313 ret = -EINVAL; 314 goto out; 315 } 316 317 ret = rtl_download_firmware(hdev, fw->data, fw->size); 318 319 out: 320 release_firmware(fw); 321 return ret; 322 } 323 324 static int btrtl_setup_rtl8723b(struct hci_dev *hdev, u16 lmp_subver, 325 const char *fw_name) 326 { 327 unsigned char *fw_data = NULL; 328 const struct firmware *fw; 329 int ret; 330 int cfg_sz; 331 u8 *cfg_buff = NULL; 332 u8 *tbuff; 333 char *cfg_name = NULL; 334 335 switch (lmp_subver) { 336 case RTL_ROM_LMP_8723B: 337 cfg_name = "rtl_bt/rtl8723b_config.bin"; 338 break; 339 case RTL_ROM_LMP_8821A: 340 cfg_name = "rtl_bt/rtl8821a_config.bin"; 341 break; 342 case RTL_ROM_LMP_8761A: 343 cfg_name = "rtl_bt/rtl8761a_config.bin"; 344 break; 345 case RTL_ROM_LMP_8822B: 346 cfg_name = "rtl_bt/rtl8822b_config.bin"; 347 break; 348 default: 349 BT_ERR("%s: rtl: no config according to lmp_subver %04x", 350 hdev->name, lmp_subver); 351 break; 352 } 353 354 if (cfg_name) { 355 cfg_sz = rtl_load_config(hdev, cfg_name, &cfg_buff); 356 if (cfg_sz < 0) 357 cfg_sz = 0; 358 } else 359 cfg_sz = 0; 360 361 BT_INFO("%s: rtl: loading %s", hdev->name, fw_name); 362 ret = request_firmware(&fw, fw_name, &hdev->dev); 363 if (ret < 0) { 364 BT_ERR("%s: Failed to load %s", hdev->name, fw_name); 365 goto err_req_fw; 366 } 367 368 ret = rtl8723b_parse_firmware(hdev, lmp_subver, fw, &fw_data); 369 if (ret < 0) 370 goto out; 371 372 if (cfg_sz) { 373 tbuff = kzalloc(ret + cfg_sz, GFP_KERNEL); 374 if (!tbuff) { 375 ret = -ENOMEM; 376 goto out; 377 } 378 379 memcpy(tbuff, fw_data, ret); 380 kfree(fw_data); 381 382 memcpy(tbuff + ret, cfg_buff, cfg_sz); 383 ret += cfg_sz; 384 385 fw_data = tbuff; 386 } 387 388 BT_INFO("cfg_sz %d, total size %d", cfg_sz, ret); 389 390 ret = rtl_download_firmware(hdev, fw_data, ret); 391 392 out: 393 release_firmware(fw); 394 kfree(fw_data); 395 err_req_fw: 396 if (cfg_sz) 397 kfree(cfg_buff); 398 return ret; 399 } 400 401 static struct sk_buff *btrtl_read_local_version(struct hci_dev *hdev) 402 { 403 struct sk_buff *skb; 404 405 skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, 406 HCI_INIT_TIMEOUT); 407 if (IS_ERR(skb)) { 408 BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION failed (%ld)", 409 hdev->name, PTR_ERR(skb)); 410 return skb; 411 } 412 413 if (skb->len != sizeof(struct hci_rp_read_local_version)) { 414 BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION event length mismatch", 415 hdev->name); 416 kfree_skb(skb); 417 return ERR_PTR(-EIO); 418 } 419 420 return skb; 421 } 422 423 int btrtl_setup_realtek(struct hci_dev *hdev) 424 { 425 struct sk_buff *skb; 426 struct hci_rp_read_local_version *resp; 427 u16 lmp_subver; 428 429 skb = btrtl_read_local_version(hdev); 430 if (IS_ERR(skb)) 431 return -PTR_ERR(skb); 432 433 resp = (struct hci_rp_read_local_version *)skb->data; 434 BT_INFO("%s: rtl: examining hci_ver=%02x hci_rev=%04x lmp_ver=%02x " 435 "lmp_subver=%04x", hdev->name, resp->hci_ver, resp->hci_rev, 436 resp->lmp_ver, resp->lmp_subver); 437 438 lmp_subver = le16_to_cpu(resp->lmp_subver); 439 kfree_skb(skb); 440 441 /* Match a set of subver values that correspond to stock firmware, 442 * which is not compatible with standard btusb. 443 * If matched, upload an alternative firmware that does conform to 444 * standard btusb. Once that firmware is uploaded, the subver changes 445 * to a different value. 446 */ 447 switch (lmp_subver) { 448 case RTL_ROM_LMP_8723A: 449 case RTL_ROM_LMP_3499: 450 return btrtl_setup_rtl8723a(hdev); 451 case RTL_ROM_LMP_8723B: 452 return btrtl_setup_rtl8723b(hdev, lmp_subver, 453 "rtl_bt/rtl8723b_fw.bin"); 454 case RTL_ROM_LMP_8821A: 455 return btrtl_setup_rtl8723b(hdev, lmp_subver, 456 "rtl_bt/rtl8821a_fw.bin"); 457 case RTL_ROM_LMP_8761A: 458 return btrtl_setup_rtl8723b(hdev, lmp_subver, 459 "rtl_bt/rtl8761a_fw.bin"); 460 case RTL_ROM_LMP_8822B: 461 return btrtl_setup_rtl8723b(hdev, lmp_subver, 462 "rtl_bt/rtl8822b_fw.bin"); 463 default: 464 BT_INFO("rtl: assuming no firmware upload needed."); 465 return 0; 466 } 467 } 468 EXPORT_SYMBOL_GPL(btrtl_setup_realtek); 469 470 MODULE_AUTHOR("Daniel Drake <drake@endlessm.com>"); 471 MODULE_DESCRIPTION("Bluetooth support for Realtek devices ver " VERSION); 472 MODULE_VERSION(VERSION); 473 MODULE_LICENSE("GPL"); 474