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device: add a new macro to obtain the device object symbol name

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The new SYS_GET_DEVICE_NAME macro can be used in combination with
SYS_GET_DEVICE to obtain an external reference to a static device
object, e.g.:

extern struct device SYS_GET_DEVICE_NAME(my_device_name);
struct device* dev = SYS_GET_DEVICE(my_device_name);

dev is here set at compile time.

Change-Id: I9094925c685177f01e0cef194ec382ad49658f9d
Signed-off-by: Fabien Chereau <fabien.chereau@intel.com>
This commit is contained in:
Fabien Chereau 2016-01-12 13:53:39 +01:00 • committed by Anas Nashif
commit 49abcb3fff
1 changed files with 18 additions and 1 deletions
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19
include/init.h
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@ -85,6 +85,23 @@
.config = &(config_##name),\
.driver_data = data}
/**
* @def SYS_GET_DEVICE_NAME
*
* @brief Expands to the full name of a global device object
*
* @details Return the full name of a device object symbol created by
* SYS_DEFINE_DEVICE(), using the @name provided to SYS_DEFINE_DEVICE().
*
* It is meant to be used for declaring extern symbols pointing on device
* objects before using the SYS_GET_DEVICE macro to get the device object.
*
* @param name The same name provided to SYS_DEFINE_DEVICE()
*
* @return The exanded name of the device object created by SYS_DEFINE_DEVICE()
*/
#define SYS_GET_DEVICE_NAME(name) (_CONCAT(__initconfig_, name))
/**
* @def SYS_GET_DEVICE
*
@ -97,6 +114,6 @@
*
* @return A pointer to the device object created by SYS_DEFINE_DEVICE()
*/
#define SYS_GET_DEVICE(name) (&(_CONCAT(__initconfig_, name)))
#define SYS_GET_DEVICE(name) (&SYS_GET_DEVICE_NAME(name))
#endif /* _INIT_H_ */