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- #include <linux/init.h> // Macros used to mark up functions e.g., __init __exit
- #include <linux/module.h> // Core header for loading LKMs into the kernel
- #include <linux/kernel.h> // Contains types, macros, functions for the kernel
- MODULE_LICENSE("GPL"); ///< The license type -- this affects runtime behavior
- MODULE_AUTHOR("Derek Molloy"); ///< The author -- visible when you use modinfo
- MODULE_DESCRIPTION("A simple Linux driver for the BBB."); ///< The description -- see modinfo
- MODULE_VERSION("0.1"); ///< The version of the module
- static char *name = "world"; ///< An example LKM argument -- default value is "world"
- module_param(name, charp, S_IRUGO); ///< Param desc. charp = char ptr, S_IRUGO can be read/not changed
- MODULE_PARM_DESC(name, "The name to display in /var/log/kern.log"); ///< parameter description
- /** @brief The LKM initialization function
- * The static keyword restricts the visibility of the function to within this C file. The __init
- * macro means that for a built-in driver (not a LKM) the function is only used at initialization
- * time and that it can be discarded and its memory freed up after that point.
- * @return returns 0 if successful
- */
- static int __init helloBBB_init(void){
- printk(KERN_INFO "EBB: Hello %s from the BBB LKM!\n", name);
- return 0;
- }
- /** @brief The LKM cleanup function
- * Similar to the initialization function, it is static. The __exit macro notifies that if this
- * code is used for a built-in driver (not a LKM) that this function is not required.
- */
- static void __exit helloBBB_exit(void){
- printk(KERN_INFO "EBB: Goodbye %s from the BBB LKM!\n", name);
- }
- /** @brief A module must use the module_init() module_exit() macros from linux/init.h, which
- * identify the initialization function at insertion time and the cleanup function (as
- * listed above)
- */
- module_init(helloBBB_init);
- module_exit(helloBBB_exit);
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