drivers/base/firmware_loader/sysfs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __FIRMWARE_SYSFS_H
   3 #define __FIRMWARE_SYSFS_H
   4
   5 #include <linux/device.h>
   6
   7 #include "firmware.h"
   8
   9 MODULE_IMPORT_NS("FIRMWARE_LOADER_PRIVATE");
  10
  11 extern struct firmware_fallback_config fw_fallback_config;
  12 extern struct device_attribute dev_attr_loading;
  13
  14 #ifdef CONFIG_FW_LOADER_USER_HELPER
  15 /**
  16  * struct firmware_fallback_config - firmware fallback configuration settings
  17  *
  18  * Helps describe and fine tune the fallback mechanism.
  19  *
  20  * @force_sysfs_fallback: force the sysfs fallback mechanism to be used
  21  *      as if one had enabled CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y.
  22  *      Useful to help debug a CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y
  23  *      functionality on a kernel where that config entry has been disabled.
  24  * @ignore_sysfs_fallback: force to disable the sysfs fallback mechanism.
  25  *      This emulates the behaviour as if we had set the kernel
  26  *      config CONFIG_FW_LOADER_USER_HELPER=n.
  27  * @old_timeout: for internal use
  28  * @loading_timeout: the timeout to wait for the fallback mechanism before
  29  *      giving up, in seconds.
  30  */
  31 struct firmware_fallback_config {
  32         unsigned int force_sysfs_fallback;
  33         unsigned int ignore_sysfs_fallback;
  34         int old_timeout;
  35         int loading_timeout;
  36 };
  37
  38 /* These getters are vetted to use int properly */
  39 static inline int __firmware_loading_timeout(void)
  40 {
  41         return fw_fallback_config.loading_timeout;
  42 }
  43
  44 /* These setters are vetted to use int properly */
  45 static inline void __fw_fallback_set_timeout(int timeout)
  46 {
  47         fw_fallback_config.loading_timeout = timeout;
  48 }
  49 #endif
  50
  51 #ifdef CONFIG_FW_LOADER_SYSFS
  52 int register_sysfs_loader(void);
  53 void unregister_sysfs_loader(void);
  54 #if defined(CONFIG_FW_LOADER_USER_HELPER) && defined(CONFIG_SYSCTL)
  55 int register_firmware_config_sysctl(void);
  56 void unregister_firmware_config_sysctl(void);
  57 #else
  58 static inline int register_firmware_config_sysctl(void)
  59 {
  60         return 0;
  61 }
  62
  63 static inline void unregister_firmware_config_sysctl(void) { }
  64 #endif /* CONFIG_FW_LOADER_USER_HELPER && CONFIG_SYSCTL */
  65 #else /* CONFIG_FW_LOADER_SYSFS */
  66 static inline int register_sysfs_loader(void)
  67 {
  68         return 0;
  69 }
  70
  71 static inline void unregister_sysfs_loader(void)
  72 {
  73 }
  74 #endif /* CONFIG_FW_LOADER_SYSFS */
  75
  76 struct fw_sysfs {
  77         bool nowait;
  78         struct device dev;
  79         struct fw_priv *fw_priv;
  80         struct firmware *fw;
  81         void *fw_upload_priv;
  82 };
  83 #define to_fw_sysfs(__dev)      container_of_const(__dev, struct fw_sysfs, dev)
  84
  85 void __fw_load_abort(struct fw_priv *fw_priv);
  86
  87 static inline void fw_load_abort(struct fw_sysfs *fw_sysfs)
  88 {
  89         struct fw_priv *fw_priv = fw_sysfs->fw_priv;
  90
  91         __fw_load_abort(fw_priv);
  92 }
  93
  94 struct fw_sysfs *
  95 fw_create_instance(struct firmware *firmware, const char *fw_name,
  96                    struct device *device, u32 opt_flags);
  97
  98 #ifdef CONFIG_FW_UPLOAD
  99 extern struct device_attribute dev_attr_status;
 100 extern struct device_attribute dev_attr_error;
 101 extern struct device_attribute dev_attr_cancel;
 102 extern struct device_attribute dev_attr_remaining_size;
 103
 104 int fw_upload_start(struct fw_sysfs *fw_sysfs);
 105 void fw_upload_free(struct fw_sysfs *fw_sysfs);
 106 umode_t fw_upload_is_visible(struct kobject *kobj, struct attribute *attr, int n);
 107 #else
 108 static inline int fw_upload_start(struct fw_sysfs *fw_sysfs)
 109 {
 110         return 0;
 111 }
 112
 113 static inline void fw_upload_free(struct fw_sysfs *fw_sysfs)
 114 {
 115 }
 116 #endif
 117
 118 #endif /* __FIRMWARE_SYSFS_H */