linux/drivers/nfc/s3fwrn5/firmware.c
Krzysztof Kozlowski edfa5366ef nfc: s3fwrn5: simplify dereferencing pointer to struct device
Simplify the code dereferencing several pointers to reach the struct
device.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-10-11 17:00:51 -07:00

497 lines
11 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* NCI based driver for Samsung S3FWRN5 NFC chip
*
* Copyright (C) 2015 Samsung Electrnoics
* Robert Baldyga <r.baldyga@samsung.com>
*/
#include <linux/completion.h>
#include <linux/firmware.h>
#include <crypto/hash.h>
#include <crypto/sha1.h>
#include "s3fwrn5.h"
#include "firmware.h"
struct s3fwrn5_fw_version {
__u8 major;
__u8 build1;
__u8 build2;
__u8 target;
};
static int s3fwrn5_fw_send_msg(struct s3fwrn5_fw_info *fw_info,
struct sk_buff *msg, struct sk_buff **rsp)
{
struct s3fwrn5_info *info =
container_of(fw_info, struct s3fwrn5_info, fw_info);
long ret;
reinit_completion(&fw_info->completion);
ret = s3fwrn5_write(info, msg);
if (ret < 0)
return ret;
ret = wait_for_completion_interruptible_timeout(
&fw_info->completion, msecs_to_jiffies(1000));
if (ret < 0)
return ret;
else if (ret == 0)
return -ENXIO;
if (!fw_info->rsp)
return -EINVAL;
*rsp = fw_info->rsp;
fw_info->rsp = NULL;
return 0;
}
static int s3fwrn5_fw_prep_msg(struct s3fwrn5_fw_info *fw_info,
struct sk_buff **msg, u8 type, u8 code, const void *data, u16 len)
{
struct s3fwrn5_fw_header hdr;
struct sk_buff *skb;
hdr.type = type | fw_info->parity;
fw_info->parity ^= 0x80;
hdr.code = code;
hdr.len = len;
skb = alloc_skb(S3FWRN5_FW_HDR_SIZE + len, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_put_data(skb, &hdr, S3FWRN5_FW_HDR_SIZE);
if (len)
skb_put_data(skb, data, len);
*msg = skb;
return 0;
}
static int s3fwrn5_fw_get_bootinfo(struct s3fwrn5_fw_info *fw_info,
struct s3fwrn5_fw_cmd_get_bootinfo_rsp *bootinfo)
{
struct sk_buff *msg, *rsp = NULL;
struct s3fwrn5_fw_header *hdr;
int ret;
/* Send GET_BOOTINFO command */
ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_CMD,
S3FWRN5_FW_CMD_GET_BOOTINFO, NULL, 0);
if (ret < 0)
return ret;
ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
kfree_skb(msg);
if (ret < 0)
return ret;
hdr = (struct s3fwrn5_fw_header *) rsp->data;
if (hdr->code != S3FWRN5_FW_RET_SUCCESS) {
ret = -EINVAL;
goto out;
}
memcpy(bootinfo, rsp->data + S3FWRN5_FW_HDR_SIZE, 10);
out:
kfree_skb(rsp);
return ret;
}
static int s3fwrn5_fw_enter_update_mode(struct s3fwrn5_fw_info *fw_info,
const void *hash_data, u16 hash_size,
const void *sig_data, u16 sig_size)
{
struct s3fwrn5_fw_cmd_enter_updatemode args;
struct sk_buff *msg, *rsp = NULL;
struct s3fwrn5_fw_header *hdr;
int ret;
/* Send ENTER_UPDATE_MODE command */
args.hashcode_size = hash_size;
args.signature_size = sig_size;
ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_CMD,
S3FWRN5_FW_CMD_ENTER_UPDATE_MODE, &args, sizeof(args));
if (ret < 0)
return ret;
ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
kfree_skb(msg);
if (ret < 0)
return ret;
hdr = (struct s3fwrn5_fw_header *) rsp->data;
if (hdr->code != S3FWRN5_FW_RET_SUCCESS) {
ret = -EPROTO;
goto out;
}
kfree_skb(rsp);
/* Send hashcode data */
ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_DATA, 0,
hash_data, hash_size);
if (ret < 0)
return ret;
ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
kfree_skb(msg);
if (ret < 0)
return ret;
hdr = (struct s3fwrn5_fw_header *) rsp->data;
if (hdr->code != S3FWRN5_FW_RET_SUCCESS) {
ret = -EPROTO;
goto out;
}
kfree_skb(rsp);
/* Send signature data */
ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_DATA, 0,
sig_data, sig_size);
if (ret < 0)
return ret;
ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
kfree_skb(msg);
if (ret < 0)
return ret;
hdr = (struct s3fwrn5_fw_header *) rsp->data;
if (hdr->code != S3FWRN5_FW_RET_SUCCESS)
ret = -EPROTO;
out:
kfree_skb(rsp);
return ret;
}
static int s3fwrn5_fw_update_sector(struct s3fwrn5_fw_info *fw_info,
u32 base_addr, const void *data)
{
struct s3fwrn5_fw_cmd_update_sector args;
struct sk_buff *msg, *rsp = NULL;
struct s3fwrn5_fw_header *hdr;
int ret, i;
/* Send UPDATE_SECTOR command */
args.base_address = base_addr;
ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_CMD,
S3FWRN5_FW_CMD_UPDATE_SECTOR, &args, sizeof(args));
if (ret < 0)
return ret;
ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
kfree_skb(msg);
if (ret < 0)
return ret;
hdr = (struct s3fwrn5_fw_header *) rsp->data;
if (hdr->code != S3FWRN5_FW_RET_SUCCESS) {
ret = -EPROTO;
goto err;
}
kfree_skb(rsp);
/* Send data split into 256-byte packets */
for (i = 0; i < 16; ++i) {
ret = s3fwrn5_fw_prep_msg(fw_info, &msg,
S3FWRN5_FW_MSG_DATA, 0, data+256*i, 256);
if (ret < 0)
break;
ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
kfree_skb(msg);
if (ret < 0)
break;
hdr = (struct s3fwrn5_fw_header *) rsp->data;
if (hdr->code != S3FWRN5_FW_RET_SUCCESS) {
ret = -EPROTO;
goto err;
}
kfree_skb(rsp);
}
return ret;
err:
kfree_skb(rsp);
return ret;
}
static int s3fwrn5_fw_complete_update_mode(struct s3fwrn5_fw_info *fw_info)
{
struct sk_buff *msg, *rsp = NULL;
struct s3fwrn5_fw_header *hdr;
int ret;
/* Send COMPLETE_UPDATE_MODE command */
ret = s3fwrn5_fw_prep_msg(fw_info, &msg, S3FWRN5_FW_MSG_CMD,
S3FWRN5_FW_CMD_COMPLETE_UPDATE_MODE, NULL, 0);
if (ret < 0)
return ret;
ret = s3fwrn5_fw_send_msg(fw_info, msg, &rsp);
kfree_skb(msg);
if (ret < 0)
return ret;
hdr = (struct s3fwrn5_fw_header *) rsp->data;
if (hdr->code != S3FWRN5_FW_RET_SUCCESS)
ret = -EPROTO;
kfree_skb(rsp);
return ret;
}
/*
* Firmware header structure:
*
* 0x00 - 0x0B : Date and time string (w/o NUL termination)
* 0x10 - 0x13 : Firmware version
* 0x14 - 0x17 : Signature address
* 0x18 - 0x1B : Signature size
* 0x1C - 0x1F : Firmware image address
* 0x20 - 0x23 : Firmware sectors count
* 0x24 - 0x27 : Custom signature address
* 0x28 - 0x2B : Custom signature size
*/
#define S3FWRN5_FW_IMAGE_HEADER_SIZE 44
int s3fwrn5_fw_request_firmware(struct s3fwrn5_fw_info *fw_info)
{
struct s3fwrn5_fw_image *fw = &fw_info->fw;
u32 sig_off;
u32 image_off;
u32 custom_sig_off;
int ret;
ret = request_firmware(&fw->fw, fw_info->fw_name,
&fw_info->ndev->nfc_dev->dev);
if (ret < 0)
return ret;
if (fw->fw->size < S3FWRN5_FW_IMAGE_HEADER_SIZE) {
release_firmware(fw->fw);
return -EINVAL;
}
memcpy(fw->date, fw->fw->data + 0x00, 12);
fw->date[12] = '\0';
memcpy(&fw->version, fw->fw->data + 0x10, 4);
memcpy(&sig_off, fw->fw->data + 0x14, 4);
fw->sig = fw->fw->data + sig_off;
memcpy(&fw->sig_size, fw->fw->data + 0x18, 4);
memcpy(&image_off, fw->fw->data + 0x1C, 4);
fw->image = fw->fw->data + image_off;
memcpy(&fw->image_sectors, fw->fw->data + 0x20, 4);
memcpy(&custom_sig_off, fw->fw->data + 0x24, 4);
fw->custom_sig = fw->fw->data + custom_sig_off;
memcpy(&fw->custom_sig_size, fw->fw->data + 0x28, 4);
return 0;
}
static void s3fwrn5_fw_release_firmware(struct s3fwrn5_fw_info *fw_info)
{
release_firmware(fw_info->fw.fw);
}
static int s3fwrn5_fw_get_base_addr(
struct s3fwrn5_fw_cmd_get_bootinfo_rsp *bootinfo, u32 *base_addr)
{
int i;
static const struct {
u8 version[4];
u32 base_addr;
} match[] = {
{{0x05, 0x00, 0x00, 0x00}, 0x00005000},
{{0x05, 0x00, 0x00, 0x01}, 0x00003000},
{{0x05, 0x00, 0x00, 0x02}, 0x00003000},
{{0x05, 0x00, 0x00, 0x03}, 0x00003000},
{{0x05, 0x00, 0x00, 0x05}, 0x00003000}
};
for (i = 0; i < ARRAY_SIZE(match); ++i)
if (bootinfo->hw_version[0] == match[i].version[0] &&
bootinfo->hw_version[1] == match[i].version[1] &&
bootinfo->hw_version[3] == match[i].version[3]) {
*base_addr = match[i].base_addr;
return 0;
}
return -EINVAL;
}
static inline bool
s3fwrn5_fw_is_custom(const struct s3fwrn5_fw_cmd_get_bootinfo_rsp *bootinfo)
{
return !!bootinfo->hw_version[2];
}
int s3fwrn5_fw_setup(struct s3fwrn5_fw_info *fw_info)
{
struct device *dev = &fw_info->ndev->nfc_dev->dev;
struct s3fwrn5_fw_cmd_get_bootinfo_rsp bootinfo;
int ret;
/* Get bootloader info */
ret = s3fwrn5_fw_get_bootinfo(fw_info, &bootinfo);
if (ret < 0) {
dev_err(dev, "Failed to get bootinfo, ret=%02x\n", ret);
goto err;
}
/* Match hardware version to obtain firmware base address */
ret = s3fwrn5_fw_get_base_addr(&bootinfo, &fw_info->base_addr);
if (ret < 0) {
dev_err(dev, "Unknown hardware version\n");
goto err;
}
fw_info->sector_size = bootinfo.sector_size;
fw_info->sig_size = s3fwrn5_fw_is_custom(&bootinfo) ?
fw_info->fw.custom_sig_size : fw_info->fw.sig_size;
fw_info->sig = s3fwrn5_fw_is_custom(&bootinfo) ?
fw_info->fw.custom_sig : fw_info->fw.sig;
return 0;
err:
s3fwrn5_fw_release_firmware(fw_info);
return ret;
}
bool s3fwrn5_fw_check_version(const struct s3fwrn5_fw_info *fw_info, u32 version)
{
struct s3fwrn5_fw_version *new = (void *) &fw_info->fw.version;
struct s3fwrn5_fw_version *old = (void *) &version;
if (new->major > old->major)
return true;
if (new->build1 > old->build1)
return true;
if (new->build2 > old->build2)
return true;
return false;
}
int s3fwrn5_fw_download(struct s3fwrn5_fw_info *fw_info)
{
struct device *dev = &fw_info->ndev->nfc_dev->dev;
struct s3fwrn5_fw_image *fw = &fw_info->fw;
u8 hash_data[SHA1_DIGEST_SIZE];
struct crypto_shash *tfm;
u32 image_size, off;
int ret;
image_size = fw_info->sector_size * fw->image_sectors;
/* Compute SHA of firmware data */
tfm = crypto_alloc_shash("sha1", 0, 0);
if (IS_ERR(tfm)) {
dev_err(dev, "Cannot allocate shash (code=%pe)\n", tfm);
return PTR_ERR(tfm);
}
ret = crypto_shash_tfm_digest(tfm, fw->image, image_size, hash_data);
crypto_free_shash(tfm);
if (ret) {
dev_err(dev, "Cannot compute hash (code=%d)\n", ret);
return ret;
}
/* Firmware update process */
dev_info(dev, "Firmware update: %s\n", fw_info->fw_name);
ret = s3fwrn5_fw_enter_update_mode(fw_info, hash_data,
SHA1_DIGEST_SIZE, fw_info->sig, fw_info->sig_size);
if (ret < 0) {
dev_err(dev, "Unable to enter update mode\n");
return ret;
}
for (off = 0; off < image_size; off += fw_info->sector_size) {
ret = s3fwrn5_fw_update_sector(fw_info,
fw_info->base_addr + off, fw->image + off);
if (ret < 0) {
dev_err(dev, "Firmware update error (code=%d)\n", ret);
return ret;
}
}
ret = s3fwrn5_fw_complete_update_mode(fw_info);
if (ret < 0) {
dev_err(dev, "Unable to complete update mode\n");
return ret;
}
dev_info(dev, "Firmware update: success\n");
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;
if (WARN_ON(fw_info->rsp)) {
kfree_skb(skb);
return -EINVAL;
}
fw_info->rsp = skb;
complete(&fw_info->completion);
return 0;
}