drivers/base/firmware_loader/fallback.h

   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 #include "firmware.h"
   9
  10 /**
  11  * struct firmware_fallback_config - firmware fallback configuration settings
  12  *
  13  * Helps describe and fine tune the fallback mechanism.
  14  *
  15  * @force_sysfs_fallback: force the sysfs fallback mechanism to be used
  16  *      as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y.
  17  *      Useful to help debug a CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y
  18  *      functionality on a kernel where that config entry has been disabled.
  19  * @ignore_sysfs_fallback: force to disable the sysfs fallback mechanism.
  20  *      This emulates the behaviour as if we had set the kernel
  21  *      config CONFIG_FW_LOADER_USER_HELPER=n.
  22  * @old_timeout: for internal use
  23  * @loading_timeout: the timeout to wait for the fallback mechanism before
  24  *      giving up, in seconds.
  25  */
  26 struct firmware_fallback_config {
  27         unsigned int force_sysfs_fallback;
  28         unsigned int ignore_sysfs_fallback;
  29         int old_timeout;
  30         int loading_timeout;
  31 };
  32
  33 #ifdef CONFIG_FW_LOADER_USER_HELPER
  34 int firmware_fallback_sysfs(struct firmware *fw, const char *name,
  35                             struct device *device,
  36                             u32 opt_flags,
  37                             int ret);
  38 void kill_pending_fw_fallback_reqs(bool only_kill_custom);
  39
  40 void fw_fallback_set_cache_timeout(void);
  41 void fw_fallback_set_default_timeout(void);
  42
  43 int register_sysfs_loader(void);
  44 void unregister_sysfs_loader(void);
  45 #else /* CONFIG_FW_LOADER_USER_HELPER */
  46 static inline int firmware_fallback_sysfs(struct firmware *fw, const char *name,
  47                                           struct device *device,
  48                                           u32 opt_flags,
  49                                           int ret)
  50 {
  51         /* Keep carrying over the same error */
  52         return ret;
  53 }
  54
  55 static inline void kill_pending_fw_fallback_reqs(bool only_kill_custom) { }
  56 static inline void fw_fallback_set_cache_timeout(void) { }
  57 static inline void fw_fallback_set_default_timeout(void) { }
  58
  59 static inline int register_sysfs_loader(void)
  60 {
  61         return 0;
  62 }
  63
  64 static inline void unregister_sysfs_loader(void)
  65 {
  66 }
  67 #endif /* CONFIG_FW_LOADER_USER_HELPER */
  68
  69 #ifdef CONFIG_EFI_EMBEDDED_FIRMWARE
  70 int firmware_fallback_platform(struct fw_priv *fw_priv);
  71 #else
  72 static inline int firmware_fallback_platform(struct fw_priv *fw_priv)
  73 {
  74         return -ENOENT;
  75 }
  76 #endif
  77
  78 #endif /* __FIRMWARE_FALLBACK_H */