drivers/base/firmware_loader/fallback_table.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/types.h>
   4 #include <linux/kconfig.h>
   5 #include <linux/list.h>
   6 #include <linux/slab.h>
   7 #include <linux/export.h>
   8 #include <linux/security.h>
   9 #include <linux/highmem.h>
  10 #include <linux/umh.h>
  11 #include <linux/sysctl.h>
  12
  13 #include "fallback.h"
  14 #include "firmware.h"
  15
  16 /*
  17  * firmware fallback configuration table
  18  */
  19
  20 struct firmware_fallback_config fw_fallback_config = {
  21         .force_sysfs_fallback = IS_ENABLED(CONFIG_FW_LOADER_USER_HELPER_FALLBACK),
  22         .loading_timeout = 60,
  23         .old_timeout = 60,
  24 };
  25 EXPORT_SYMBOL_NS_GPL(fw_fallback_config, FIRMWARE_LOADER_PRIVATE);
  26
  27 #ifdef CONFIG_SYSCTL
  28 static struct ctl_table firmware_config_table[] = {
  29         {
  30                 .procname       = "force_sysfs_fallback",
  31                 .data           = &fw_fallback_config.force_sysfs_fallback,
  32                 .maxlen         = sizeof(unsigned int),
  33                 .mode           = 0644,
  34                 .proc_handler   = proc_douintvec_minmax,
  35                 .extra1         = SYSCTL_ZERO,
  36                 .extra2         = SYSCTL_ONE,
  37         },
  38         {
  39                 .procname       = "ignore_sysfs_fallback",
  40                 .data           = &fw_fallback_config.ignore_sysfs_fallback,
  41                 .maxlen         = sizeof(unsigned int),
  42                 .mode           = 0644,
  43                 .proc_handler   = proc_douintvec_minmax,
  44                 .extra1         = SYSCTL_ZERO,
  45                 .extra2         = SYSCTL_ONE,
  46         },
  47         { }
  48 };
  49
  50 static struct ctl_table_header *firmware_config_sysct_table_header;
  51 int register_firmware_config_sysctl(void)
  52 {
  53         firmware_config_sysct_table_header =
  54                 register_sysctl("kernel/firmware_config",
  55                                 firmware_config_table);
  56         if (!firmware_config_sysct_table_header)
  57                 return -ENOMEM;
  58         return 0;
  59 }
  60 EXPORT_SYMBOL_NS_GPL(register_firmware_config_sysctl, FIRMWARE_LOADER_PRIVATE);
  61
  62 void unregister_firmware_config_sysctl(void)
  63 {
  64         unregister_sysctl_table(firmware_config_sysct_table_header);
  65         firmware_config_sysct_table_header = NULL;
  66 }
  67 EXPORT_SYMBOL_NS_GPL(unregister_firmware_config_sysctl, FIRMWARE_LOADER_PRIVATE);
  68
  69 #endif /* CONFIG_SYSCTL */