include/linux/firmware.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_FIRMWARE_H
   3 #define _LINUX_FIRMWARE_H
   4
   5 #include <linux/types.h>
   6 #include <linux/compiler.h>
   7 #include <linux/gfp.h>
   8
   9 #define FW_ACTION_NOHOTPLUG 0
  10 #define FW_ACTION_HOTPLUG 1
  11
  12 struct firmware {
  13         size_t size;
  14         const u8 *data;
  15         struct page **pages;
  16
  17         /* firmware loader private fields */
  18         void *priv;
  19 };
  20
  21 struct module;
  22 struct device;
  23
  24 struct builtin_fw {
  25         char *name;
  26         void *data;
  27         unsigned long size;
  28 };
  29
  30 /* We have to play tricks here much like stringify() to get the
  31    __COUNTER__ macro to be expanded as we want it */
  32 #define __fw_concat1(x, y) x##y
  33 #define __fw_concat(x, y) __fw_concat1(x, y)
  34
  35 #define DECLARE_BUILTIN_FIRMWARE(name, blob)                                 \
  36         DECLARE_BUILTIN_FIRMWARE_SIZE(name, &(blob), sizeof(blob))
  37
  38 #define DECLARE_BUILTIN_FIRMWARE_SIZE(name, blob, size)                      \
  39         static const struct builtin_fw __fw_concat(__builtin_fw,__COUNTER__) \
  40         __used __section(.builtin_fw) = { name, blob, size }
  41
  42 #if defined(CONFIG_FW_LOADER) || (defined(CONFIG_FW_LOADER_MODULE) && defined(MODULE))
  43 int request_firmware(const struct firmware **fw, const char *name,
  44                      struct device *device);
  45 int request_firmware_nowait(
  46         struct module *module, bool uevent,
  47         const char *name, struct device *device, gfp_t gfp, void *context,
  48         void (*cont)(const struct firmware *fw, void *context));
  49 int request_firmware_direct(const struct firmware **fw, const char *name,
  50                             struct device *device);
  51 int request_firmware_into_buf(const struct firmware **firmware_p,
  52         const char *name, struct device *device, void *buf, size_t size);
  53
  54 void release_firmware(const struct firmware *fw);
  55 #else
  56 static inline int request_firmware(const struct firmware **fw,
  57                                    const char *name,
  58                                    struct device *device)
  59 {
  60         return -EINVAL;
  61 }
  62 static inline int request_firmware_nowait(
  63         struct module *module, bool uevent,
  64         const char *name, struct device *device, gfp_t gfp, void *context,
  65         void (*cont)(const struct firmware *fw, void *context))
  66 {
  67         return -EINVAL;
  68 }
  69
  70 static inline void release_firmware(const struct firmware *fw)
  71 {
  72 }
  73
  74 static inline int request_firmware_direct(const struct firmware **fw,
  75                                           const char *name,
  76                                           struct device *device)
  77 {
  78         return -EINVAL;
  79 }
  80
  81 static inline int request_firmware_into_buf(const struct firmware **firmware_p,
  82         const char *name, struct device *device, void *buf, size_t size)
  83 {
  84         return -EINVAL;
  85 }
  86
  87 #endif
  88 #endif