530 lines
12 KiB
C
530 lines
12 KiB
C
/*
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* NCI based driver for Samsung S3FWRN5 NFC chip
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*
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* Copyright (C) 2015 Samsung Electrnoics
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* Robert Baldyga <r.baldyga@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/completion.h>
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#include <linux/firmware.h>
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#include <crypto/hash.h>
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#include <crypto/sha.h>
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#include "s3fwrn5.h"
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#include "firmware.h"
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struct s3fwrn5_fw_version {
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__u8 major;
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__u8 build1;
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__u8 build2;
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__u8 target;
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};
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static int s3fwrn5_fw_send_msg(struct s3fwrn5_fw_info *fw_info,
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struct sk_buff *msg, struct sk_buff **rsp)
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{
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struct s3fwrn5_info *info =
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container_of(fw_info, struct s3fwrn5_info, fw_info);
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long ret;
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reinit_completion(&fw_info->completion);
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ret = s3fwrn5_write(info, msg);
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if (ret < 0)
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return ret;
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ret = wait_for_completion_interruptible_timeout(
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&fw_info->completion, msecs_to_jiffies(1000));
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if (ret < 0)
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return ret;
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else if (ret == 0)
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return -ENXIO;
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if (!fw_info->rsp)
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return -EINVAL;
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*rsp = fw_info->rsp;
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fw_info->rsp = NULL;
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return 0;
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}
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static int s3fwrn5_fw_prep_msg(struct s3fwrn5_fw_info *fw_info,
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struct sk_buff **msg, u8 type, u8 code, const void *data, u16 len)
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{
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struct s3fwrn5_fw_header hdr;
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struct sk_buff *skb;
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hdr.type = type | fw_info->parity;
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fw_info->parity ^= 0x80;
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hdr.code = code;
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hdr.len = len;
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skb = alloc_skb(S3FWRN5_FW_HDR_SIZE + len, GFP_KERNEL);
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if (!skb)
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return -ENOMEM;
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memcpy(skb_put(skb, S3FWRN5_FW_HDR_SIZE), &hdr, S3FWRN5_FW_HDR_SIZE);
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if (len)
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memcpy(skb_put(skb, len), data, len);
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*msg = skb;
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return 0;
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}
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static int s3fwrn5_fw_get_bootinfo(struct s3fwrn5_fw_info *fw_info,
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struct s3fwrn5_fw_cmd_get_bootinfo_rsp *bootinfo)
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{
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struct sk_buff *msg, *rsp = NULL;
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struct s3fwrn5_fw_header *hdr;
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int ret;
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/* Send GET_BOOTINFO command */
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ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_CMD,
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S3FWRN5_FW_CMD_GET_BOOTINFO, NULL, 0);
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if (ret < 0)
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return ret;
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ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
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kfree_skb(msg);
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if (ret < 0)
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return ret;
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hdr = (struct s3fwrn5_fw_header *) rsp->data;
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if (hdr->code != S3FWRN5_FW_RET_SUCCESS) {
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ret = -EINVAL;
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goto out;
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}
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memcpy(bootinfo, rsp->data + S3FWRN5_FW_HDR_SIZE, 10);
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out:
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kfree_skb(rsp);
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return ret;
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}
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static int s3fwrn5_fw_enter_update_mode(struct s3fwrn5_fw_info *fw_info,
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const void *hash_data, u16 hash_size,
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const void *sig_data, u16 sig_size)
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{
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struct s3fwrn5_fw_cmd_enter_updatemode args;
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struct sk_buff *msg, *rsp = NULL;
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struct s3fwrn5_fw_header *hdr;
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int ret;
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/* Send ENTER_UPDATE_MODE command */
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args.hashcode_size = hash_size;
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args.signature_size = sig_size;
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ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_CMD,
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S3FWRN5_FW_CMD_ENTER_UPDATE_MODE, &args, sizeof(args));
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if (ret < 0)
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return ret;
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ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
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kfree_skb(msg);
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if (ret < 0)
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return ret;
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hdr = (struct s3fwrn5_fw_header *) rsp->data;
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if (hdr->code != S3FWRN5_FW_RET_SUCCESS) {
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ret = -EPROTO;
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goto out;
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}
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kfree_skb(rsp);
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/* Send hashcode data */
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ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_DATA, 0,
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hash_data, hash_size);
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if (ret < 0)
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return ret;
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ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
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kfree_skb(msg);
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if (ret < 0)
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return ret;
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hdr = (struct s3fwrn5_fw_header *) rsp->data;
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if (hdr->code != S3FWRN5_FW_RET_SUCCESS) {
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ret = -EPROTO;
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goto out;
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}
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kfree_skb(rsp);
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/* Send signature data */
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ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_DATA, 0,
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sig_data, sig_size);
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if (ret < 0)
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return ret;
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ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
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kfree_skb(msg);
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if (ret < 0)
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return ret;
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hdr = (struct s3fwrn5_fw_header *) rsp->data;
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if (hdr->code != S3FWRN5_FW_RET_SUCCESS)
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ret = -EPROTO;
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out:
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kfree_skb(rsp);
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return ret;
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}
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static int s3fwrn5_fw_update_sector(struct s3fwrn5_fw_info *fw_info,
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u32 base_addr, const void *data)
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{
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struct s3fwrn5_fw_cmd_update_sector args;
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struct sk_buff *msg, *rsp = NULL;
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struct s3fwrn5_fw_header *hdr;
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int ret, i;
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/* Send UPDATE_SECTOR command */
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args.base_address = base_addr;
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ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_CMD,
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S3FWRN5_FW_CMD_UPDATE_SECTOR, &args, sizeof(args));
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if (ret < 0)
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return ret;
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ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
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kfree_skb(msg);
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if (ret < 0)
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return ret;
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hdr = (struct s3fwrn5_fw_header *) rsp->data;
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if (hdr->code != S3FWRN5_FW_RET_SUCCESS) {
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ret = -EPROTO;
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goto err;
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}
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kfree_skb(rsp);
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/* Send data split into 256-byte packets */
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for (i = 0; i < 16; ++i) {
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ret = s3fwrn5_fw_prep_msg(fw_info, &msg,
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S3FWRN5_FW_MSG_DATA, 0, data+256*i, 256);
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if (ret < 0)
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break;
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ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
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kfree_skb(msg);
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if (ret < 0)
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break;
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hdr = (struct s3fwrn5_fw_header *) rsp->data;
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if (hdr->code != S3FWRN5_FW_RET_SUCCESS) {
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ret = -EPROTO;
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goto err;
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}
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kfree_skb(rsp);
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}
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return ret;
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err:
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kfree_skb(rsp);
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return ret;
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}
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static int s3fwrn5_fw_complete_update_mode(struct s3fwrn5_fw_info *fw_info)
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{
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struct sk_buff *msg, *rsp = NULL;
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struct s3fwrn5_fw_header *hdr;
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int ret;
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/* Send COMPLETE_UPDATE_MODE command */
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ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_CMD,
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S3FWRN5_FW_CMD_COMPLETE_UPDATE_MODE, NULL, 0);
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if (ret < 0)
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return ret;
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ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
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kfree_skb(msg);
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if (ret < 0)
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return ret;
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hdr = (struct s3fwrn5_fw_header *) rsp->data;
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if (hdr->code != S3FWRN5_FW_RET_SUCCESS)
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ret = -EPROTO;
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kfree_skb(rsp);
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return ret;
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}
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/*
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* Firmware header stucture:
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*
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* 0x00 - 0x0B : Date and time string (w/o NUL termination)
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* 0x10 - 0x13 : Firmware version
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* 0x14 - 0x17 : Signature address
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* 0x18 - 0x1B : Signature size
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* 0x1C - 0x1F : Firmware image address
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* 0x20 - 0x23 : Firmware sectors count
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* 0x24 - 0x27 : Custom signature address
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* 0x28 - 0x2B : Custom signature size
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*/
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#define S3FWRN5_FW_IMAGE_HEADER_SIZE 44
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static int s3fwrn5_fw_request_firmware(struct s3fwrn5_fw_info *fw_info)
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{
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struct s3fwrn5_fw_image *fw = &fw_info->fw;
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u32 sig_off;
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u32 image_off;
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u32 custom_sig_off;
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int ret;
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ret = request_firmware(&fw->fw, fw_info->fw_name,
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&fw_info->ndev->nfc_dev->dev);
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if (ret < 0)
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return ret;
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if (fw->fw->size < S3FWRN5_FW_IMAGE_HEADER_SIZE)
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return -EINVAL;
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memcpy(fw->date, fw->fw->data + 0x00, 12);
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fw->date[12] = '\0';
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memcpy(&fw->version, fw->fw->data + 0x10, 4);
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memcpy(&sig_off, fw->fw->data + 0x14, 4);
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fw->sig = fw->fw->data + sig_off;
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memcpy(&fw->sig_size, fw->fw->data + 0x18, 4);
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memcpy(&image_off, fw->fw->data + 0x1C, 4);
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fw->image = fw->fw->data + image_off;
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memcpy(&fw->image_sectors, fw->fw->data + 0x20, 4);
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memcpy(&custom_sig_off, fw->fw->data + 0x24, 4);
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fw->custom_sig = fw->fw->data + custom_sig_off;
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memcpy(&fw->custom_sig_size, fw->fw->data + 0x28, 4);
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return 0;
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}
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static void s3fwrn5_fw_release_firmware(struct s3fwrn5_fw_info *fw_info)
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{
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release_firmware(fw_info->fw.fw);
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}
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static int s3fwrn5_fw_get_base_addr(
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struct s3fwrn5_fw_cmd_get_bootinfo_rsp *bootinfo, u32 *base_addr)
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{
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int i;
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struct {
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u8 version[4];
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u32 base_addr;
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} match[] = {
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{{0x05, 0x00, 0x00, 0x00}, 0x00005000},
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{{0x05, 0x00, 0x00, 0x01}, 0x00003000},
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{{0x05, 0x00, 0x00, 0x02}, 0x00003000},
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{{0x05, 0x00, 0x00, 0x03}, 0x00003000},
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{{0x05, 0x00, 0x00, 0x05}, 0x00003000}
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};
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for (i = 0; i < ARRAY_SIZE(match); ++i)
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if (bootinfo->hw_version[0] == match[i].version[0] &&
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bootinfo->hw_version[1] == match[i].version[1] &&
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bootinfo->hw_version[3] == match[i].version[3]) {
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*base_addr = match[i].base_addr;
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return 0;
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}
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return -EINVAL;
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}
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static inline bool
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s3fwrn5_fw_is_custom(struct s3fwrn5_fw_cmd_get_bootinfo_rsp *bootinfo)
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{
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return !!bootinfo->hw_version[2];
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}
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int s3fwrn5_fw_setup(struct s3fwrn5_fw_info *fw_info)
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{
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struct s3fwrn5_fw_cmd_get_bootinfo_rsp bootinfo;
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int ret;
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/* Get firmware data */
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ret = s3fwrn5_fw_request_firmware(fw_info);
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if (ret < 0) {
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dev_err(&fw_info->ndev->nfc_dev->dev,
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"Failed to get fw file, ret=%02x\n", ret);
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return ret;
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}
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/* Get bootloader info */
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ret = s3fwrn5_fw_get_bootinfo(fw_info, &bootinfo);
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if (ret < 0) {
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dev_err(&fw_info->ndev->nfc_dev->dev,
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"Failed to get bootinfo, ret=%02x\n", ret);
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goto err;
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}
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/* Match hardware version to obtain firmware base address */
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ret = s3fwrn5_fw_get_base_addr(&bootinfo, &fw_info->base_addr);
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if (ret < 0) {
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dev_err(&fw_info->ndev->nfc_dev->dev,
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"Unknown hardware version\n");
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goto err;
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}
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fw_info->sector_size = bootinfo.sector_size;
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fw_info->sig_size = s3fwrn5_fw_is_custom(&bootinfo) ?
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fw_info->fw.custom_sig_size : fw_info->fw.sig_size;
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fw_info->sig = s3fwrn5_fw_is_custom(&bootinfo) ?
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fw_info->fw.custom_sig : fw_info->fw.sig;
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return 0;
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err:
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s3fwrn5_fw_release_firmware(fw_info);
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return ret;
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}
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bool s3fwrn5_fw_check_version(struct s3fwrn5_fw_info *fw_info, u32 version)
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{
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struct s3fwrn5_fw_version *new = (void *) &fw_info->fw.version;
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struct s3fwrn5_fw_version *old = (void *) &version;
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if (new->major > old->major)
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return true;
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if (new->build1 > old->build1)
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return true;
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if (new->build2 > old->build2)
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return true;
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return false;
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}
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int s3fwrn5_fw_download(struct s3fwrn5_fw_info *fw_info)
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{
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struct s3fwrn5_fw_image *fw = &fw_info->fw;
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u8 hash_data[SHA1_DIGEST_SIZE];
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struct crypto_shash *tfm;
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u32 image_size, off;
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int ret;
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image_size = fw_info->sector_size * fw->image_sectors;
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/* Compute SHA of firmware data */
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tfm = crypto_alloc_shash("sha1", 0, 0);
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if (IS_ERR(tfm)) {
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ret = PTR_ERR(tfm);
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dev_err(&fw_info->ndev->nfc_dev->dev,
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"Cannot allocate shash (code=%d)\n", ret);
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goto out;
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}
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{
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SHASH_DESC_ON_STACK(desc, tfm);
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desc->tfm = tfm;
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desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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ret = crypto_shash_digest(desc, fw->image, image_size,
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hash_data);
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shash_desc_zero(desc);
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}
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crypto_free_shash(tfm);
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if (ret) {
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dev_err(&fw_info->ndev->nfc_dev->dev,
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"Cannot compute hash (code=%d)\n", ret);
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goto out;
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}
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/* Firmware update process */
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dev_info(&fw_info->ndev->nfc_dev->dev,
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"Firmware update: %s\n", fw_info->fw_name);
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ret = s3fwrn5_fw_enter_update_mode(fw_info, hash_data,
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SHA1_DIGEST_SIZE, fw_info->sig, fw_info->sig_size);
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if (ret < 0) {
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dev_err(&fw_info->ndev->nfc_dev->dev,
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"Unable to enter update mode\n");
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goto out;
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}
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for (off = 0; off < image_size; off += fw_info->sector_size) {
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ret = s3fwrn5_fw_update_sector(fw_info,
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fw_info->base_addr + off, fw->image + off);
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if (ret < 0) {
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dev_err(&fw_info->ndev->nfc_dev->dev,
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"Firmware update error (code=%d)\n", ret);
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goto out;
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}
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}
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ret = s3fwrn5_fw_complete_update_mode(fw_info);
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if (ret < 0) {
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dev_err(&fw_info->ndev->nfc_dev->dev,
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"Unable to complete update mode\n");
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goto out;
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}
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dev_info(&fw_info->ndev->nfc_dev->dev,
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"Firmware update: success\n");
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out:
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return ret;
|
|
}
|
|
|
|
void s3fwrn5_fw_init(struct s3fwrn5_fw_info *fw_info, const char *fw_name)
|
|
{
|
|
fw_info->parity = 0x00;
|
|
fw_info->rsp = NULL;
|
|
fw_info->fw.fw = NULL;
|
|
strcpy(fw_info->fw_name, fw_name);
|
|
init_completion(&fw_info->completion);
|
|
}
|
|
|
|
void s3fwrn5_fw_cleanup(struct s3fwrn5_fw_info *fw_info)
|
|
{
|
|
s3fwrn5_fw_release_firmware(fw_info);
|
|
}
|
|
|
|
int s3fwrn5_fw_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
|
|
{
|
|
struct s3fwrn5_info *info = nci_get_drvdata(ndev);
|
|
struct s3fwrn5_fw_info *fw_info = &info->fw_info;
|
|
|
|
BUG_ON(fw_info->rsp);
|
|
|
|
fw_info->rsp = skb;
|
|
|
|
complete(&fw_info->completion);
|
|
|
|
return 0;
|
|
}
|