mirror of https://gitee.com/openkylin/linux.git
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __FIRMWARE_LOADER_H
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#define __FIRMWARE_LOADER_H
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#include <linux/firmware.h>
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#include <linux/types.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/completion.h>
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#include <generated/utsrelease.h>
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/* firmware behavior options */
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#define FW_OPT_UEVENT (1U << 0)
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#define FW_OPT_NOWAIT (1U << 1)
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#define FW_OPT_USERHELPER (1U << 2)
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#define FW_OPT_NO_WARN (1U << 3)
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#define FW_OPT_NOCACHE (1U << 4)
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#define FW_OPT_NOFALLBACK (1U << 5)
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enum fw_status {
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FW_STATUS_UNKNOWN,
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FW_STATUS_LOADING,
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FW_STATUS_DONE,
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FW_STATUS_ABORTED,
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};
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/*
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* Concurrent request_firmware() for the same firmware need to be
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* serialized. struct fw_state is simple state machine which hold the
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* state of the firmware loading.
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*/
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struct fw_state {
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struct completion completion;
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enum fw_status status;
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};
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struct fw_priv {
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struct kref ref;
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struct list_head list;
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struct firmware_cache *fwc;
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struct fw_state fw_st;
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void *data;
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size_t size;
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size_t allocated_size;
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#ifdef CONFIG_FW_LOADER_USER_HELPER
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bool is_paged_buf;
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bool need_uevent;
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struct page **pages;
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int nr_pages;
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int page_array_size;
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struct list_head pending_list;
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#endif
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const char *fw_name;
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};
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extern struct mutex fw_lock;
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static inline bool __fw_state_check(struct fw_priv *fw_priv,
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enum fw_status status)
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{
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struct fw_state *fw_st = &fw_priv->fw_st;
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return fw_st->status == status;
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}
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static inline int __fw_state_wait_common(struct fw_priv *fw_priv, long timeout)
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{
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struct fw_state *fw_st = &fw_priv->fw_st;
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long ret;
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ret = wait_for_completion_killable_timeout(&fw_st->completion, timeout);
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if (ret != 0 && fw_st->status == FW_STATUS_ABORTED)
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return -ENOENT;
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if (!ret)
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return -ETIMEDOUT;
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return ret < 0 ? ret : 0;
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}
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static inline void __fw_state_set(struct fw_priv *fw_priv,
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enum fw_status status)
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{
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struct fw_state *fw_st = &fw_priv->fw_st;
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WRITE_ONCE(fw_st->status, status);
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if (status == FW_STATUS_DONE || status == FW_STATUS_ABORTED)
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complete_all(&fw_st->completion);
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}
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static inline void fw_state_aborted(struct fw_priv *fw_priv)
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{
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__fw_state_set(fw_priv, FW_STATUS_ABORTED);
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}
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static inline bool fw_state_is_aborted(struct fw_priv *fw_priv)
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{
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return __fw_state_check(fw_priv, FW_STATUS_ABORTED);
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}
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static inline void fw_state_start(struct fw_priv *fw_priv)
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{
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__fw_state_set(fw_priv, FW_STATUS_LOADING);
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}
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static inline void fw_state_done(struct fw_priv *fw_priv)
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{
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__fw_state_set(fw_priv, FW_STATUS_DONE);
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}
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int assign_fw(struct firmware *fw, struct device *device,
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unsigned int opt_flags);
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#endif /* __FIRMWARE_LOADER_H */
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