drivers/staging/greybus/Documentation/firmware/firmware.c
Source file repositories/reference/linux-study-clean/drivers/staging/greybus/Documentation/firmware/firmware.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/staging/greybus/Documentation/firmware/firmware.c- Extension
.c- Size
- 5795 bytes
- Lines
- 219
- Domain
- Driver Families
- Bucket
- drivers/staging
- Inferred role
- Driver Families: implementation source
- Status
- source implementation candidate
Why This File Exists
Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
stdio.hstdlib.hstring.hunistd.hsys/ioctl.hsys/stat.hfcntl.h../../greybus_firmware.h
Detected Declarations
function usagefunction update_intf_firmwarefunction update_backend_firmwarefunction main
Annotated Snippet
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
/*
* Sample code to test firmware-management protocol
*
* Copyright(c) 2016 Google Inc. All rights reserved.
* Copyright(c) 2016 Linaro Ltd. All rights reserved.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "../../greybus_firmware.h"
#define FW_DEV_DEFAULT "/dev/gb-fw-mgmt-0"
#define FW_TAG_INT_DEFAULT "s3f"
#define FW_TAG_BCND_DEFAULT "bf_01"
#define FW_UPDATE_TYPE_DEFAULT 0
#define FW_TIMEOUT_DEFAULT 10000
static const char *firmware_tag;
static const char *fwdev = FW_DEV_DEFAULT;
static unsigned int fw_update_type = FW_UPDATE_TYPE_DEFAULT;
static unsigned int fw_timeout = FW_TIMEOUT_DEFAULT;
static struct fw_mgmt_ioc_get_intf_version intf_fw_info;
static struct fw_mgmt_ioc_get_backend_version backend_fw_info;
static struct fw_mgmt_ioc_intf_load_and_validate intf_load;
static struct fw_mgmt_ioc_backend_fw_update backend_update;
static void usage(void)
{
printf("\nUsage: ./firmware <gb-fw-mgmt-X (default: gb-fw-mgmt-0)> <interface: 0, backend: 1 (default: 0)> <firmware-tag> (default: \"s3f\"/\"bf_01\") <timeout (default: 10000 ms)>\n");
}
static int update_intf_firmware(int fd)
{
int ret;
/* Get Interface Firmware Version */
printf("Get Interface Firmware Version\n");
ret = ioctl(fd, FW_MGMT_IOC_GET_INTF_FW, &intf_fw_info);
if (ret < 0) {
printf("Failed to get interface firmware version: %s (%d)\n",
fwdev, ret);
return -1;
}
printf("Interface Firmware tag (%s), major (%d), minor (%d)\n",
intf_fw_info.firmware_tag, intf_fw_info.major,
intf_fw_info.minor);
/* Try Interface Firmware load over Unipro */
printf("Loading Interface Firmware\n");
intf_load.load_method = GB_FW_U_LOAD_METHOD_UNIPRO;
intf_load.status = 0;
intf_load.major = 0;
intf_load.minor = 0;
strncpy((char *)&intf_load.firmware_tag, firmware_tag,
GB_FIRMWARE_U_TAG_MAX_SIZE);
ret = ioctl(fd, FW_MGMT_IOC_INTF_LOAD_AND_VALIDATE, &intf_load);
if (ret < 0) {
printf("Failed to load interface firmware: %s (%d)\n", fwdev,
ret);
return -1;
}
if (intf_load.status != GB_FW_U_LOAD_STATUS_VALIDATED &&
intf_load.status != GB_FW_U_LOAD_STATUS_UNVALIDATED) {
printf("Load status says loading failed: %d\n",
intf_load.status);
return -1;
}
printf("Interface Firmware (%s) Load done: major: %d, minor: %d, status: %d\n",
firmware_tag, intf_load.major, intf_load.minor,
intf_load.status);
/* Initiate Mode-switch to the newly loaded firmware */
printf("Initiate Mode switch\n");
ret = ioctl(fd, FW_MGMT_IOC_MODE_SWITCH);
Annotation
- Immediate include surface: `stdio.h`, `stdlib.h`, `string.h`, `unistd.h`, `sys/ioctl.h`, `sys/stat.h`, `fcntl.h`, `../../greybus_firmware.h`.
- Detected declarations: `function usage`, `function update_intf_firmware`, `function update_backend_firmware`, `function main`.
- Atlas domain: Driver Families / drivers/staging.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.