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// SPDX-License-Identifier: GPL-2.0-only
/*
* ntpfw.c - Firmware helper functions for Neofidelity codecs
*
* Copyright (c) 2024, SaluteDevices. All Rights Reserved.
*/
#include <linux/i2c.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include "ntpfw.h"
struct ntpfw_chunk {
__be16 length;
u8 step;
u8 data[];
} __packed;
struct ntpfw_header {
__be32 magic;
} __packed;
static bool ntpfw_verify(struct device *dev, const u8 *buf, size_t buf_size, u32 magic)
{
const struct ntpfw_header *header = (struct ntpfw_header *)buf;
u32 buf_magic;
if (buf_size <= sizeof(*header)) {
dev_err(dev, "Failed to load firmware: image too small\n");
return false;
}
buf_magic = be32_to_cpu(header->magic);
if (buf_magic != magic) {
dev_err(dev, "Failed to load firmware: invalid magic 0x%x:\n", buf_magic);
return false;
}
return true;
}
static bool ntpfw_verify_chunk(struct device *dev, const struct ntpfw_chunk *chunk, size_t buf_size)
{
size_t chunk_size;
if (buf_size <= sizeof(*chunk)) {
dev_err(dev, "Failed to load firmware: chunk size too big\n");
return false;
}
if (chunk->step != 2 && chunk->step != 5) {
dev_err(dev, "Failed to load firmware: invalid chunk step: %d\n", chunk->step);
return false;
}
chunk_size = be16_to_cpu(chunk->length);
if (chunk_size > buf_size) {
dev_err(dev, "Failed to load firmware: invalid chunk length\n");
return false;
}
if (chunk_size % chunk->step) {
dev_err(dev, "Failed to load firmware: chunk length and step mismatch\n");
return false;
}
return true;
}
static int ntpfw_send_chunk(struct i2c_client *i2c, const struct ntpfw_chunk *chunk)
{
int ret;
size_t i;
size_t length = be16_to_cpu(chunk->length);
for (i = 0; i < length; i += chunk->step) {
ret = i2c_master_send(i2c, &chunk->data[i], chunk->step);
if (ret != chunk->step) {
dev_err(&i2c->dev, "I2C send failed: %d\n", ret);
return ret < 0 ? ret : -EIO;
}
}
return 0;
}
int ntpfw_load(struct i2c_client *i2c, const char *name, u32 magic)
{
struct device *dev = &i2c->dev;
const struct ntpfw_chunk *chunk;
const struct firmware *fw;
const u8 *data;
size_t leftover;
int ret;
ret = request_firmware(&fw, name, dev);
if (ret) {
dev_warn(dev, "request_firmware '%s' failed with %d\n",
name, ret);
return ret;
}
if (!ntpfw_verify(dev, fw->data, fw->size, magic)) {
ret = -EINVAL;
goto done;
}
data = fw->data + sizeof(struct ntpfw_header);
leftover = fw->size - sizeof(struct ntpfw_header);
while (leftover) {
chunk = (struct ntpfw_chunk *)data;
if (!ntpfw_verify_chunk(dev, chunk, leftover)) {
ret = -EINVAL;
goto done;
}
ret = ntpfw_send_chunk(i2c, chunk);
if (ret)
goto done;
data += be16_to_cpu(chunk->length) + sizeof(*chunk);
leftover -= be16_to_cpu(chunk->length) + sizeof(*chunk);
}
done:
release_firmware(fw);
return ret;
}
EXPORT_SYMBOL_GPL(ntpfw_load);
MODULE_AUTHOR("Igor Prusov <ivprusov@salutedevices.com>");
MODULE_DESCRIPTION("Helper for loading Neofidelity amplifiers firmware");
MODULE_LICENSE("GPL");
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