/* * Bluetooth support for Realtek devices * * Copyright (C) 2015 Endless Mobile, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include <linux/module.h> #include <linux/firmware.h> #include <asm/unaligned.h> #include <linux/usb.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h> #include "btrtl.h" #define VERSION "0.1" #define RTL_EPATCH_SIGNATURE "Realtech" #define RTL_ROM_LMP_3499 0x3499 #define RTL_ROM_LMP_8723A 0x1200 #define RTL_ROM_LMP_8723B 0x8723 #define RTL_ROM_LMP_8821A 0x8821 #define RTL_ROM_LMP_8761A 0x8761 static int rtl_read_rom_version(struct hci_dev *hdev, u8 *version) { struct rtl_rom_version_evt *rom_version; struct sk_buff *skb; /* Read RTL ROM version command */ skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT); if (IS_ERR(skb)) { BT_ERR("%s: Read ROM version failed (%ld)", hdev->name, PTR_ERR(skb)); return PTR_ERR(skb); } if (skb->len != sizeof(*rom_version)) { BT_ERR("%s: RTL version event length mismatch", hdev->name); kfree_skb(skb); return -EIO; } rom_version = (struct rtl_rom_version_evt *)skb->data; BT_INFO("%s: rom_version status=%x version=%x", hdev->name, rom_version->status, rom_version->version); *version = rom_version->version; kfree_skb(skb); return 0; } static int rtl8723b_parse_firmware(struct hci_dev *hdev, u16 lmp_subver, const struct firmware *fw, unsigned char **_buf) { const u8 extension_sig[] = { 0x51, 0x04, 0xfd, 0x77 }; struct rtl_epatch_header *epatch_info; unsigned char *buf; int i, ret, len; size_t min_size; u8 opcode, length, data, rom_version = 0; int project_id = -1; const unsigned char *fwptr, *chip_id_base; const unsigned char *patch_length_base, *patch_offset_base; u32 patch_offset = 0; u16 patch_length, num_patches; const u16 project_id_to_lmp_subver[] = { RTL_ROM_LMP_8723A, RTL_ROM_LMP_8723B, RTL_ROM_LMP_8821A, RTL_ROM_LMP_8761A }; ret = rtl_read_rom_version(hdev, &rom_version); if (ret) return ret; min_size = sizeof(struct rtl_epatch_header) + sizeof(extension_sig) + 3; if (fw->size < min_size) return -EINVAL; fwptr = fw->data + fw->size - sizeof(extension_sig); if (memcmp(fwptr, extension_sig, sizeof(extension_sig)) != 0) { BT_ERR("%s: extension section signature mismatch", hdev->name); return -EINVAL; } /* Loop from the end of the firmware parsing instructions, until * we find an instruction that identifies the "project ID" for the * hardware supported by this firwmare file. * Once we have that, we double-check that that project_id is suitable * for the hardware we are working with. */ while (fwptr >= fw->data + (sizeof(struct rtl_epatch_header) + 3)) { opcode = *--fwptr; length = *--fwptr; data = *--fwptr; BT_DBG("check op=%x len=%x data=%x", opcode, length, data); if (opcode == 0xff) /* EOF */ break; if (length == 0) { BT_ERR("%s: found instruction with length 0", hdev->name); return -EINVAL; } if (opcode == 0 && length == 1) { project_id = data; break; } fwptr -= length; } if (project_id < 0) { BT_ERR("%s: failed to find version instruction", hdev->name); return -EINVAL; } if (project_id >= ARRAY_SIZE(project_id_to_lmp_subver)) { BT_ERR("%s: unknown project id %d", hdev->name, project_id); return -EINVAL; } if (lmp_subver != project_id_to_lmp_subver[project_id]) { BT_ERR("%s: firmware is for %x but this is a %x", hdev->name, project_id_to_lmp_subver[project_id], lmp_subver); return -EINVAL; } epatch_info = (struct rtl_epatch_header *)fw->data; if (memcmp(epatch_info->signature, RTL_EPATCH_SIGNATURE, 8) != 0) { BT_ERR("%s: bad EPATCH signature", hdev->name); return -EINVAL; } num_patches = le16_to_cpu(epatch_info->num_patches); BT_DBG("fw_version=%x, num_patches=%d", le32_to_cpu(epatch_info->fw_version), num_patches); /* After the rtl_epatch_header there is a funky patch metadata section. * Assuming 2 patches, the layout is: * ChipID1 ChipID2 PatchLength1 PatchLength2 PatchOffset1 PatchOffset2 * * Find the right patch for this chip. */ min_size += 8 * num_patches; if (fw->size < min_size) return -EINVAL; chip_id_base = fw->data + sizeof(struct rtl_epatch_header); patch_length_base = chip_id_base + (sizeof(u16) * num_patches); patch_offset_base = patch_length_base + (sizeof(u16) * num_patches); for (i = 0; i < num_patches; i++) { u16 chip_id = get_unaligned_le16(chip_id_base + (i * sizeof(u16))); if (chip_id == rom_version + 1) { patch_length = get_unaligned_le16(patch_length_base + (i * sizeof(u16))); patch_offset = get_unaligned_le32(patch_offset_base + (i * sizeof(u32))); break; } } if (!patch_offset) { BT_ERR("%s: didn't find patch for chip id %d", hdev->name, rom_version); return -EINVAL; } BT_DBG("length=%x offset=%x index %d", patch_length, patch_offset, i); min_size = patch_offset + patch_length; if (fw->size < min_size) return -EINVAL; /* Copy the firmware into a new buffer and write the version at * the end. */ len = patch_length; buf = kmemdup(fw->data + patch_offset, patch_length, GFP_KERNEL); if (!buf) return -ENOMEM; memcpy(buf + patch_length - 4, &epatch_info->fw_version, 4); *_buf = buf; return len; } static int rtl_download_firmware(struct hci_dev *hdev, const unsigned char *data, int fw_len) { struct rtl_download_cmd *dl_cmd; int frag_num = fw_len / RTL_FRAG_LEN + 1; int frag_len = RTL_FRAG_LEN; int ret = 0; int i; dl_cmd = kmalloc(sizeof(struct rtl_download_cmd), GFP_KERNEL); if (!dl_cmd) return -ENOMEM; for (i = 0; i < frag_num; i++) { struct sk_buff *skb; BT_DBG("download fw (%d/%d)", i, frag_num); dl_cmd->index = i; if (i == (frag_num - 1)) { dl_cmd->index |= 0x80; /* data end */ frag_len = fw_len % RTL_FRAG_LEN; } memcpy(dl_cmd->data, data, frag_len); /* Send download command */ skb = __hci_cmd_sync(hdev, 0xfc20, frag_len + 1, dl_cmd, HCI_INIT_TIMEOUT); if (IS_ERR(skb)) { BT_ERR("%s: download fw command failed (%ld)", hdev->name, PTR_ERR(skb)); ret = -PTR_ERR(skb); goto out; } if (skb->len != sizeof(struct rtl_download_response)) { BT_ERR("%s: download fw event length mismatch", hdev->name); kfree_skb(skb); ret = -EIO; goto out; } kfree_skb(skb); data += RTL_FRAG_LEN; } out: kfree(dl_cmd); return ret; } static int btrtl_setup_rtl8723a(struct hci_dev *hdev) { const struct firmware *fw; int ret; BT_INFO("%s: rtl: loading rtl_bt/rtl8723a_fw.bin", hdev->name); ret = request_firmware(&fw, "rtl_bt/rtl8723a_fw.bin", &hdev->dev); if (ret < 0) { BT_ERR("%s: Failed to load rtl_bt/rtl8723a_fw.bin", hdev->name); return ret; } if (fw->size < 8) { ret = -EINVAL; goto out; } /* Check that the firmware doesn't have the epatch signature * (which is only for RTL8723B and newer). */ if (!memcmp(fw->data, RTL_EPATCH_SIGNATURE, 8)) { BT_ERR("%s: unexpected EPATCH signature!", hdev->name); ret = -EINVAL; goto out; } ret = rtl_download_firmware(hdev, fw->data, fw->size); out: release_firmware(fw); return ret; } static int btrtl_setup_rtl8723b(struct hci_dev *hdev, u16 lmp_subver, const char *fw_name) { unsigned char *fw_data = NULL; const struct firmware *fw; int ret; BT_INFO("%s: rtl: loading %s", hdev->name, fw_name); ret = request_firmware(&fw, fw_name, &hdev->dev); if (ret < 0) { BT_ERR("%s: Failed to load %s", hdev->name, fw_name); return ret; } ret = rtl8723b_parse_firmware(hdev, lmp_subver, fw, &fw_data); if (ret < 0) goto out; ret = rtl_download_firmware(hdev, fw_data, ret); kfree(fw_data); if (ret < 0) goto out; out: release_firmware(fw); return ret; } static struct sk_buff *btrtl_read_local_version(struct hci_dev *hdev) { struct sk_buff *skb; skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL, HCI_INIT_TIMEOUT); if (IS_ERR(skb)) { BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION failed (%ld)", hdev->name, PTR_ERR(skb)); return skb; } if (skb->len != sizeof(struct hci_rp_read_local_version)) { BT_ERR("%s: HCI_OP_READ_LOCAL_VERSION event length mismatch", hdev->name); kfree_skb(skb); return ERR_PTR(-EIO); } return skb; } int btrtl_setup_realtek(struct hci_dev *hdev) { struct sk_buff *skb; struct hci_rp_read_local_version *resp; u16 lmp_subver; skb = btrtl_read_local_version(hdev); if (IS_ERR(skb)) return -PTR_ERR(skb); resp = (struct hci_rp_read_local_version *)skb->data; BT_INFO("%s: rtl: examining hci_ver=%02x hci_rev=%04x lmp_ver=%02x " "lmp_subver=%04x", hdev->name, resp->hci_ver, resp->hci_rev, resp->lmp_ver, resp->lmp_subver); lmp_subver = le16_to_cpu(resp->lmp_subver); kfree_skb(skb); /* Match a set of subver values that correspond to stock firmware, * which is not compatible with standard btusb. * If matched, upload an alternative firmware that does conform to * standard btusb. Once that firmware is uploaded, the subver changes * to a different value. */ switch (lmp_subver) { case RTL_ROM_LMP_8723A: case RTL_ROM_LMP_3499: return btrtl_setup_rtl8723a(hdev); case RTL_ROM_LMP_8723B: return btrtl_setup_rtl8723b(hdev, lmp_subver, "rtl_bt/rtl8723b_fw.bin"); case RTL_ROM_LMP_8821A: return btrtl_setup_rtl8723b(hdev, lmp_subver, "rtl_bt/rtl8821a_fw.bin"); case RTL_ROM_LMP_8761A: return btrtl_setup_rtl8723b(hdev, lmp_subver, "rtl_bt/rtl8761a_fw.bin"); default: BT_INFO("rtl: assuming no firmware upload needed."); return 0; } } EXPORT_SYMBOL_GPL(btrtl_setup_realtek); MODULE_AUTHOR("Daniel Drake <drake@endlessm.com>"); MODULE_DESCRIPTION("Bluetooth support for Realtek devices ver " VERSION); MODULE_VERSION(VERSION); MODULE_LICENSE("GPL");