include/linux/firmware.h

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