/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_FIRMWARE_H
#define _LINUX_FIRMWARE_H
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/cleanup.h>
#include <linux/gfp.h>
#define FW_ACTION_NOUEVENT 0
#define FW_ACTION_UEVENT 1
struct firmware {
size_t size;
const u8 *data;
/* firmware loader private fields */
void *priv;
};
/**
* enum fw_upload_err - firmware upload error codes
* @ FW_UPLOAD_ERR_NONE : returned to indicate success
* @ FW_UPLOAD_ERR_HW_ERROR : error signalled by hardware , see kernel log
* @ FW_UPLOAD_ERR_TIMEOUT : SW timed out on handshake with HW / firmware
* @ FW_UPLOAD_ERR_CANCELED : upload was cancelled by the user
* @ FW_UPLOAD_ERR_BUSY : there is an upload operation already in progress
* @ FW_UPLOAD_ERR_INVALID_SIZE : invalid firmware image size
* @ FW_UPLOAD_ERR_RW_ERROR : read or write to HW failed , see kernel log
* @ FW_UPLOAD_ERR_WEAROUT : FLASH device is approaching wear - out , wait & retry
* @ FW_UPLOAD_ERR_FW_INVALID : invalid firmware file
* @ FW_UPLOAD_ERR_MAX : Maximum error code marker
*/
enum fw_upload_err {
FW_UPLOAD_ERR_NONE,
FW_UPLOAD_ERR_HW_ERROR,
FW_UPLOAD_ERR_TIMEOUT,
FW_UPLOAD_ERR_CANCELED,
FW_UPLOAD_ERR_BUSY,
FW_UPLOAD_ERR_INVALID_SIZE,
FW_UPLOAD_ERR_RW_ERROR,
FW_UPLOAD_ERR_WEAROUT,
FW_UPLOAD_ERR_FW_INVALID,
FW_UPLOAD_ERR_MAX
};
struct fw_upload {
void *dd_handle; /* reference to parent driver */
void *priv; /* firmware loader private fields */
};
/**
* struct fw_upload_ops - device specific operations to support firmware upload
* @ prepare : Required : Prepare secure update
* @ write : Required : The write ( ) op receives the remaining
* size to be written and must return the actual
* size written or a negative error code . The write ( )
* op will be called repeatedly until all data is
* written .
* @ poll_complete : Required : Check for the completion of the
* HW authentication / programming process .
* @ cancel : Required : Request cancellation of update . This op
* is called from the context of a different kernel
* thread , so race conditions need to be considered .
* @ cleanup : Optional : Complements the prepare ( )
* function and is called at the completion
* of the update , on success or failure , if the
* prepare function succeeded .
*/
struct fw_upload_ops {
enum fw_upload_err (*prepare)(struct fw_upload *fw_upload,
const u8 *data, u32 size);
enum fw_upload_err (*write)(struct fw_upload *fw_upload,
const u8 *data, u32 offset,
u32 size, u32 *written);
enum fw_upload_err (*poll_complete)(struct fw_upload *fw_upload);
void (*cancel)(struct fw_upload *fw_upload);
void (*cleanup)(struct fw_upload *fw_upload);
};
struct module;
struct device;
/*
* Built - in firmware functionality is only available if FW_LOADER = y , but not
* FW_LOADER = m
*/
#ifdef CONFIG_FW_LOADER
bool firmware_request_builtin(struct firmware *fw, const char *name);
#else
static inline bool firmware_request_builtin(struct firmware *fw,
const char *name)
{
return false ;
}
#endif
#if IS_REACHABLE(CONFIG_FW_LOADER)
int request_firmware(const struct firmware **fw, const char *name,
struct device *device);
int firmware_request_nowait_nowarn(
struct module *module, const char *name,
struct device *device, gfp_t gfp, void *context,
void (*cont)(const struct firmware *fw, void *context));
int firmware_request_nowarn(const struct firmware **fw, const char *name,
struct device *device);
int firmware_request_platform(const struct firmware **fw, const char *name,
struct device *device);
int request_firmware_nowait(
struct module *module, bool uevent,
const char *name, struct device *device, gfp_t gfp, void *context,
void (*cont)(const struct firmware *fw, void *context));
int request_firmware_direct(const struct firmware **fw, const char *name,
struct device *device);
int request_firmware_into_buf(const struct firmware **firmware_p,
const char *name, struct device *device, void *buf, size_t size);
int request_partial_firmware_into_buf(const struct firmware **firmware_p,
const char *name, struct device *device,
void *buf, size_t size, size_t offset);
void release_firmware(const struct firmware *fw);
#else
static inline int request_firmware(const struct firmware **fw,
const char *name,
struct device *device)
{
return -EINVAL;
}
static inline int firmware_request_nowait_nowarn(
struct module *module, const char *name,
struct device *device, gfp_t gfp, void *context,
void (*cont)(const struct firmware *fw, void *context))
{
return -EINVAL;
}
static inline int firmware_request_nowarn(const struct firmware **fw,
const char *name,
struct device *device)
{
return -EINVAL;
}
static inline int firmware_request_platform(const struct firmware **fw,
const char *name,
struct device *device)
{
return -EINVAL;
}
static inline int request_firmware_nowait(
struct module *module, bool uevent,
const char *name, struct device *device, gfp_t gfp, void *context,
void (*cont)(const struct firmware *fw, void *context))
{
return -EINVAL;
}
static inline void release_firmware(const struct firmware *fw)
{
}
static inline int request_firmware_direct(const struct firmware **fw,
const char *name,
struct device *device)
{
return -EINVAL;
}
static inline int request_firmware_into_buf(const struct firmware **firmware_p,
const char *name, struct device *device, void *buf, size_t size)
{
return -EINVAL;
}
static inline int request_partial_firmware_into_buf
(const struct firmware **firmware_p,
const char *name,
struct device *device,
void *buf, size_t size, size_t offset)
{
return -EINVAL;
}
#endif
#ifdef CONFIG_FW_UPLOAD
struct fw_upload *
firmware_upload_register(struct module *module, struct device *parent,
const char *name, const struct fw_upload_ops *ops,
void *dd_handle);
void firmware_upload_unregister(struct fw_upload *fw_upload);
#else
static inline struct fw_upload *
firmware_upload_register(struct module *module, struct device *parent,
const char *name, const struct fw_upload_ops *ops,
void *dd_handle)
{
return ERR_PTR(-EINVAL);
}
static inline void firmware_upload_unregister(struct fw_upload *fw_upload)
{
}
#endif
int firmware_request_cache(struct device *device, const char *name);
DEFINE_FREE(firmware, struct firmware *, release_firmware(_T))
#endif
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