drivers/gpu/drm/nouveau/nvkm/core/firmware.c

/*
 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
#include <core/device.h>
#include <core/firmware.h>

int
nvkm_firmware_load_name(const struct nvkm_subdev *subdev, const char *base,
			const char *name, int ver, const struct firmware **pfw)
{
	char path[64];
	int ret;

	snprintf(path, sizeof(path), "%s%s", base, name);
	ret = nvkm_firmware_get_version(subdev, path, ver, ver, pfw);
	if (ret < 0)
		return ret;

	return 0;
}

int
nvkm_firmware_load_blob(const struct nvkm_subdev *subdev, const char *base,
			const char *name, int ver, struct nvkm_blob *blob)
{
	const struct firmware *fw;
	int ret;

	ret = nvkm_firmware_load_name(subdev, base, name, ver, &fw);
	if (ret == 0) {
		blob->data = kmemdup(fw->data, fw->size, GFP_KERNEL);
		blob->size = fw->size;
		nvkm_firmware_put(fw);
		if (!blob->data)
			return -ENOMEM;
	}

	return ret;
}

/**
 * nvkm_firmware_get - load firmware from the official nvidia/chip/ directory
 * @subdev	subdevice that will use that firmware
 * @fwname	name of firmware file to load
 * @fw		firmware structure to load to
 *
 * Use this function to load firmware files in the form nvidia/chip/fwname.bin.
 * Firmware files released by NVIDIA will always follow this format.
 */
int
nvkm_firmware_get_version(const struct nvkm_subdev *subdev, const char *fwname,
			  int min_version, int max_version,
			  const struct firmware **fw)
{
	struct nvkm_device *device = subdev->device;
	char f[64];
	char cname[16];
	int i;

	/* Convert device name to lowercase */
	strncpy(cname, device->chip->name, sizeof(cname));
	cname[sizeof(cname) - 1] = '\0';
	i = strlen(cname);
	while (i) {
		--i;
		cname[i] = tolower(cname[i]);
	}

	for (i = max_version; i >= min_version; i--) {
		if (i != 0)
			snprintf(f, sizeof(f), "nvidia/%s/%s-%d.bin", cname, fwname, i);
		else
			snprintf(f, sizeof(f), "nvidia/%s/%s.bin", cname, fwname);

		if (!firmware_request_nowarn(fw, f, device->dev)) {
			nvkm_debug(subdev, "firmware \"%s\" loaded - "
					   "%zu byte(s)\n", f, (*fw)->size);
			return i;
		}

		nvkm_debug(subdev, "firmware \"%s\" unavailable\n", f);
	}

	nvkm_error(subdev, "failed to load firmware \"%s\"\n", fwname);
	return -ENOENT;
}

int
nvkm_firmware_get(const struct nvkm_subdev *subdev, const char *fwname,
		  const struct firmware **fw)
{
	return nvkm_firmware_get_version(subdev, fwname, 0, 0, fw);
}

/**
 * nvkm_firmware_put - release firmware loaded with nvkm_firmware_get
 */
void
nvkm_firmware_put(const struct firmware *fw)
{
	release_firmware(fw);
}