2015-05-14 02:49:09 -06:00
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/*
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* Bluetooth support for Realtek devices
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*
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* Copyright (C) 2015 Endless Mobile, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/firmware.h>
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#include <asm/unaligned.h>
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#include <linux/usb.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include "btrtl.h"
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#define VERSION "0.1"
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#define RTL_EPATCH_SIGNATURE "Realtech"
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#define RTL_ROM_LMP_3499 0x3499
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#define RTL_ROM_LMP_8723A 0x1200
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#define RTL_ROM_LMP_8723B 0x8723
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#define RTL_ROM_LMP_8821A 0x8821
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#define RTL_ROM_LMP_8761A 0x8761
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2016-09-09 09:02:05 -06:00
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#define RTL_ROM_LMP_8822B 0x8822
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2015-05-14 02:49:09 -06:00
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static int rtl_read_rom_version(struct hci_dev *hdev, u8 *version)
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{
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struct rtl_rom_version_evt *rom_version;
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struct sk_buff *skb;
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/* Read RTL ROM version command */
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skb = __hci_cmd_sync(hdev, 0xfc6d, 0, NULL, HCI_INIT_TIMEOUT);
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if (IS_ERR(skb)) {
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BT_ERR("%s: Read ROM version failed (%ld)",
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hdev->name, PTR_ERR(skb));
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return PTR_ERR(skb);
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}
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if (skb->len != sizeof(*rom_version)) {
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BT_ERR("%s: RTL version event length mismatch", hdev->name);
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kfree_skb(skb);
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return -EIO;
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}
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rom_version = (struct rtl_rom_version_evt *)skb->data;
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2017-10-30 03:42:59 -06:00
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bt_dev_info(hdev, "rom_version status=%x version=%x",
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rom_version->status, rom_version->version);
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2015-05-14 02:49:09 -06:00
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*version = rom_version->version;
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kfree_skb(skb);
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return 0;
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}
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static int rtl8723b_parse_firmware(struct hci_dev *hdev, u16 lmp_subver,
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const struct firmware *fw,
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unsigned char **_buf)
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{
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const u8 extension_sig[] = { 0x51, 0x04, 0xfd, 0x77 };
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struct rtl_epatch_header *epatch_info;
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unsigned char *buf;
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int i, ret, len;
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size_t min_size;
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u8 opcode, length, data, rom_version = 0;
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int project_id = -1;
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const unsigned char *fwptr, *chip_id_base;
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const unsigned char *patch_length_base, *patch_offset_base;
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u32 patch_offset = 0;
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u16 patch_length, num_patches;
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2016-09-09 09:02:05 -06:00
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static const struct {
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__u16 lmp_subver;
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__u8 id;
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} project_id_to_lmp_subver[] = {
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{ RTL_ROM_LMP_8723A, 0 },
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{ RTL_ROM_LMP_8723B, 1 },
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{ RTL_ROM_LMP_8821A, 2 },
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{ RTL_ROM_LMP_8761A, 3 },
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{ RTL_ROM_LMP_8822B, 8 },
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2015-05-14 02:49:09 -06:00
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};
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ret = rtl_read_rom_version(hdev, &rom_version);
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if (ret)
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return ret;
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min_size = sizeof(struct rtl_epatch_header) + sizeof(extension_sig) + 3;
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if (fw->size < min_size)
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return -EINVAL;
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fwptr = fw->data + fw->size - sizeof(extension_sig);
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if (memcmp(fwptr, extension_sig, sizeof(extension_sig)) != 0) {
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BT_ERR("%s: extension section signature mismatch", hdev->name);
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return -EINVAL;
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}
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/* Loop from the end of the firmware parsing instructions, until
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* we find an instruction that identifies the "project ID" for the
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* hardware supported by this firwmare file.
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* Once we have that, we double-check that that project_id is suitable
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* for the hardware we are working with.
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*/
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while (fwptr >= fw->data + (sizeof(struct rtl_epatch_header) + 3)) {
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opcode = *--fwptr;
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length = *--fwptr;
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data = *--fwptr;
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BT_DBG("check op=%x len=%x data=%x", opcode, length, data);
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if (opcode == 0xff) /* EOF */
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break;
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if (length == 0) {
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BT_ERR("%s: found instruction with length 0",
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hdev->name);
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return -EINVAL;
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}
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if (opcode == 0 && length == 1) {
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project_id = data;
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break;
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}
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fwptr -= length;
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}
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if (project_id < 0) {
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BT_ERR("%s: failed to find version instruction", hdev->name);
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return -EINVAL;
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}
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2016-09-09 09:02:05 -06:00
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/* Find project_id in table */
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for (i = 0; i < ARRAY_SIZE(project_id_to_lmp_subver); i++) {
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if (project_id == project_id_to_lmp_subver[i].id)
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break;
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}
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if (i >= ARRAY_SIZE(project_id_to_lmp_subver)) {
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2015-05-14 02:49:09 -06:00
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BT_ERR("%s: unknown project id %d", hdev->name, project_id);
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return -EINVAL;
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}
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2016-09-09 09:02:05 -06:00
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if (lmp_subver != project_id_to_lmp_subver[i].lmp_subver) {
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2015-05-14 02:49:09 -06:00
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BT_ERR("%s: firmware is for %x but this is a %x", hdev->name,
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2016-09-09 09:02:05 -06:00
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project_id_to_lmp_subver[i].lmp_subver, lmp_subver);
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2015-05-14 02:49:09 -06:00
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return -EINVAL;
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}
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epatch_info = (struct rtl_epatch_header *)fw->data;
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if (memcmp(epatch_info->signature, RTL_EPATCH_SIGNATURE, 8) != 0) {
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BT_ERR("%s: bad EPATCH signature", hdev->name);
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return -EINVAL;
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}
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num_patches = le16_to_cpu(epatch_info->num_patches);
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BT_DBG("fw_version=%x, num_patches=%d",
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le32_to_cpu(epatch_info->fw_version), num_patches);
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/* After the rtl_epatch_header there is a funky patch metadata section.
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* Assuming 2 patches, the layout is:
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* ChipID1 ChipID2 PatchLength1 PatchLength2 PatchOffset1 PatchOffset2
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*
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* Find the right patch for this chip.
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*/
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min_size += 8 * num_patches;
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if (fw->size < min_size)
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return -EINVAL;
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chip_id_base = fw->data + sizeof(struct rtl_epatch_header);
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patch_length_base = chip_id_base + (sizeof(u16) * num_patches);
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patch_offset_base = patch_length_base + (sizeof(u16) * num_patches);
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for (i = 0; i < num_patches; i++) {
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u16 chip_id = get_unaligned_le16(chip_id_base +
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(i * sizeof(u16)));
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if (chip_id == rom_version + 1) {
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patch_length = get_unaligned_le16(patch_length_base +
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(i * sizeof(u16)));
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patch_offset = get_unaligned_le32(patch_offset_base +
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(i * sizeof(u32)));
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break;
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}
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}
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if (!patch_offset) {
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BT_ERR("%s: didn't find patch for chip id %d",
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hdev->name, rom_version);
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return -EINVAL;
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}
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BT_DBG("length=%x offset=%x index %d", patch_length, patch_offset, i);
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min_size = patch_offset + patch_length;
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if (fw->size < min_size)
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return -EINVAL;
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/* Copy the firmware into a new buffer and write the version at
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* the end.
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*/
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len = patch_length;
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buf = kmemdup(fw->data + patch_offset, patch_length, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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memcpy(buf + patch_length - 4, &epatch_info->fw_version, 4);
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*_buf = buf;
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return len;
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}
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static int rtl_download_firmware(struct hci_dev *hdev,
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const unsigned char *data, int fw_len)
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{
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struct rtl_download_cmd *dl_cmd;
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int frag_num = fw_len / RTL_FRAG_LEN + 1;
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int frag_len = RTL_FRAG_LEN;
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int ret = 0;
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int i;
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dl_cmd = kmalloc(sizeof(struct rtl_download_cmd), GFP_KERNEL);
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if (!dl_cmd)
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return -ENOMEM;
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for (i = 0; i < frag_num; i++) {
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struct sk_buff *skb;
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BT_DBG("download fw (%d/%d)", i, frag_num);
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dl_cmd->index = i;
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if (i == (frag_num - 1)) {
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dl_cmd->index |= 0x80; /* data end */
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frag_len = fw_len % RTL_FRAG_LEN;
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}
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memcpy(dl_cmd->data, data, frag_len);
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/* Send download command */
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skb = __hci_cmd_sync(hdev, 0xfc20, frag_len + 1, dl_cmd,
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HCI_INIT_TIMEOUT);
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if (IS_ERR(skb)) {
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BT_ERR("%s: download fw command failed (%ld)",
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hdev->name, PTR_ERR(skb));
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ret = -PTR_ERR(skb);
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goto out;
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}
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if (skb->len != sizeof(struct rtl_download_response)) {
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BT_ERR("%s: download fw event length mismatch",
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hdev->name);
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kfree_skb(skb);
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ret = -EIO;
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goto out;
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}
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kfree_skb(skb);
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data += RTL_FRAG_LEN;
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}
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out:
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kfree(dl_cmd);
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return ret;
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}
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2016-09-09 09:02:05 -06:00
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static int rtl_load_config(struct hci_dev *hdev, const char *name, u8 **buff)
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{
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const struct firmware *fw;
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int ret;
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2017-10-30 03:42:59 -06:00
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bt_dev_info(hdev, "rtl: loading %s", name);
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2016-09-09 09:02:05 -06:00
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ret = request_firmware(&fw, name, &hdev->dev);
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2017-02-19 19:04:57 -07:00
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if (ret < 0)
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2016-09-09 09:02:05 -06:00
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return ret;
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ret = fw->size;
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*buff = kmemdup(fw->data, ret, GFP_KERNEL);
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2017-07-28 08:41:11 -06:00
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if (!*buff)
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ret = -ENOMEM;
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2016-09-09 09:02:05 -06:00
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release_firmware(fw);
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return ret;
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}
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2015-05-14 02:49:09 -06:00
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static int btrtl_setup_rtl8723a(struct hci_dev *hdev)
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{
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const struct firmware *fw;
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int ret;
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2017-10-30 03:42:59 -06:00
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bt_dev_info(hdev, "rtl: loading rtl_bt/rtl8723a_fw.bin");
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2015-05-14 02:49:09 -06:00
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ret = request_firmware(&fw, "rtl_bt/rtl8723a_fw.bin", &hdev->dev);
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if (ret < 0) {
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BT_ERR("%s: Failed to load rtl_bt/rtl8723a_fw.bin", hdev->name);
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return ret;
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}
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if (fw->size < 8) {
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ret = -EINVAL;
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goto out;
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}
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/* Check that the firmware doesn't have the epatch signature
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* (which is only for RTL8723B and newer).
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*/
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if (!memcmp(fw->data, RTL_EPATCH_SIGNATURE, 8)) {
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BT_ERR("%s: unexpected EPATCH signature!", hdev->name);
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ret = -EINVAL;
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goto out;
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}
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ret = rtl_download_firmware(hdev, fw->data, fw->size);
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out:
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release_firmware(fw);
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return ret;
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}
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static int btrtl_setup_rtl8723b(struct hci_dev *hdev, u16 lmp_subver,
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const char *fw_name)
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{
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unsigned char *fw_data = NULL;
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const struct firmware *fw;
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int ret;
|
2016-09-09 09:02:05 -06:00
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int cfg_sz;
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u8 *cfg_buff = NULL;
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u8 *tbuff;
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char *cfg_name = NULL;
|
2017-02-19 19:04:57 -07:00
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bool config_needed = false;
|
2016-09-09 09:02:05 -06:00
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switch (lmp_subver) {
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case RTL_ROM_LMP_8723B:
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cfg_name = "rtl_bt/rtl8723b_config.bin";
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break;
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case RTL_ROM_LMP_8821A:
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cfg_name = "rtl_bt/rtl8821a_config.bin";
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break;
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case RTL_ROM_LMP_8761A:
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cfg_name = "rtl_bt/rtl8761a_config.bin";
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break;
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case RTL_ROM_LMP_8822B:
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cfg_name = "rtl_bt/rtl8822b_config.bin";
|
2017-02-19 19:04:57 -07:00
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config_needed = true;
|
2016-09-09 09:02:05 -06:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
BT_ERR("%s: rtl: no config according to lmp_subver %04x",
|
|
|
|
hdev->name, lmp_subver);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (cfg_name) {
|
|
|
|
cfg_sz = rtl_load_config(hdev, cfg_name, &cfg_buff);
|
2017-02-19 19:04:57 -07:00
|
|
|
if (cfg_sz < 0) {
|
2016-09-09 09:02:05 -06:00
|
|
|
cfg_sz = 0;
|
2017-02-19 19:04:57 -07:00
|
|
|
if (config_needed)
|
|
|
|
BT_ERR("Necessary config file %s not found\n",
|
|
|
|
cfg_name);
|
|
|
|
}
|
2016-09-09 09:02:05 -06:00
|
|
|
} else
|
|
|
|
cfg_sz = 0;
|
2015-05-14 02:49:09 -06:00
|
|
|
|
2017-10-30 03:42:59 -06:00
|
|
|
bt_dev_info(hdev, "rtl: loading %s", fw_name);
|
2015-05-14 02:49:09 -06:00
|
|
|
ret = request_firmware(&fw, fw_name, &hdev->dev);
|
|
|
|
if (ret < 0) {
|
|
|
|
BT_ERR("%s: Failed to load %s", hdev->name, fw_name);
|
2016-09-09 09:02:05 -06:00
|
|
|
goto err_req_fw;
|
2015-05-14 02:49:09 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
ret = rtl8723b_parse_firmware(hdev, lmp_subver, fw, &fw_data);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out;
|
|
|
|
|
2016-09-09 09:02:05 -06:00
|
|
|
if (cfg_sz) {
|
|
|
|
tbuff = kzalloc(ret + cfg_sz, GFP_KERNEL);
|
|
|
|
if (!tbuff) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
memcpy(tbuff, fw_data, ret);
|
|
|
|
kfree(fw_data);
|
|
|
|
|
|
|
|
memcpy(tbuff + ret, cfg_buff, cfg_sz);
|
|
|
|
ret += cfg_sz;
|
|
|
|
|
|
|
|
fw_data = tbuff;
|
|
|
|
}
|
|
|
|
|
2017-10-30 03:42:59 -06:00
|
|
|
bt_dev_info(hdev, "cfg_sz %d, total size %d", cfg_sz, ret);
|
2016-09-09 09:02:05 -06:00
|
|
|
|
2015-05-14 02:49:09 -06:00
|
|
|
ret = rtl_download_firmware(hdev, fw_data, ret);
|
|
|
|
|
|
|
|
out:
|
|
|
|
release_firmware(fw);
|
2016-09-09 09:02:05 -06:00
|
|
|
kfree(fw_data);
|
|
|
|
err_req_fw:
|
|
|
|
if (cfg_sz)
|
|
|
|
kfree(cfg_buff);
|
2015-05-14 02:49:09 -06:00
|
|
|
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;
|
2017-10-30 03:42:59 -06:00
|
|
|
bt_dev_info(hdev, "rtl: examining hci_ver=%02x hci_rev=%04x "
|
|
|
|
"lmp_ver=%02x lmp_subver=%04x",
|
|
|
|
resp->hci_ver, resp->hci_rev,
|
|
|
|
resp->lmp_ver, resp->lmp_subver);
|
2015-05-14 02:49:09 -06:00
|
|
|
|
|
|
|
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");
|
2016-09-09 09:02:05 -06:00
|
|
|
case RTL_ROM_LMP_8822B:
|
|
|
|
return btrtl_setup_rtl8723b(hdev, lmp_subver,
|
|
|
|
"rtl_bt/rtl8822b_fw.bin");
|
2015-05-14 02:49:09 -06:00
|
|
|
default:
|
2017-10-30 03:42:59 -06:00
|
|
|
bt_dev_info(hdev, "rtl: assuming no firmware upload needed");
|
2015-05-14 02:49:09 -06:00
|
|
|
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");
|