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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __FIRMWARE_FALLBACK_H
3#define __FIRMWARE_FALLBACK_H
4
5#include <linux/firmware.h>
6#include <linux/device.h>
7
8/**
9 * struct firmware_fallback_config - firmware fallback configuratioon settings
10 *
11 * Helps describe and fine tune the fallback mechanism.
12 *
13 * @force_sysfs_fallback: force the sysfs fallback mechanism to be used
14 * as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y.
15 * Useful to help debug a CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y
16 * functionality on a kernel where that config entry has been disabled.
17 * @ignore_sysfs_fallback: force to disable the sysfs fallback mechanism.
18 * This emulates the behaviour as if we had set the kernel
19 * config CONFIG_FW_LOADER_USER_HELPER=n.
20 * @old_timeout: for internal use
21 * @loading_timeout: the timeout to wait for the fallback mechanism before
22 * giving up, in seconds.
23 */
24struct firmware_fallback_config {
25 unsigned int force_sysfs_fallback;
26 unsigned int ignore_sysfs_fallback;
27 int old_timeout;
28 int loading_timeout;
29};
30
31#ifdef CONFIG_FW_LOADER_USER_HELPER
32int fw_sysfs_fallback(struct firmware *fw, const char *name,
33 struct device *device,
34 unsigned int opt_flags,
35 int ret);
36void kill_pending_fw_fallback_reqs(bool only_kill_custom);
37
38void fw_fallback_set_cache_timeout(void);
39void fw_fallback_set_default_timeout(void);
40
41int register_sysfs_loader(void);
42void unregister_sysfs_loader(void);
43#else /* CONFIG_FW_LOADER_USER_HELPER */
44static inline int fw_sysfs_fallback(struct firmware *fw, const char *name,
45 struct device *device,
46 unsigned int opt_flags,
47 int ret)
48{
49 /* Keep carrying over the same error */
50 return ret;
51}
52
53static inline void kill_pending_fw_fallback_reqs(bool only_kill_custom) { }
54static inline void fw_fallback_set_cache_timeout(void) { }
55static inline void fw_fallback_set_default_timeout(void) { }
56
57static inline int register_sysfs_loader(void)
58{
59 return 0;
60}
61
62static inline void unregister_sysfs_loader(void)
63{
64}
65#endif /* CONFIG_FW_LOADER_USER_HELPER */
66
67#endif /* __FIRMWARE_FALLBACK_H */