spawn char device at /dev/, implement read

1 files changed, 25 insertions, 3 deletions

diff --git a/main.h b/main.h
index 229e387..e437853 100644
--- a/main.h
+++ b/main.h
@@ -1,7 +1,29 @@
-#ifndef _MAIN_H_
-#define _MAIN_H_
+#ifndef _HELLOMAIN_H_
+#define _HELLOMAIN_H_
 
-extern char *debugmsg;
+#include <linux/cdev.h>
+
+#ifndef HELLO_MAJOR
+#define HELLO_MAJOR 0 /* let kernel choose, unless user really defined it */
+#endif
+
+#define HELLO_KERNEL_BUFF_LEN 1024
+
+extern int hello_major;
+extern int hello_minor;
+
+extern char *magicstr;
+
+struct hello_dev {
+    dev_t devnum;
+    struct cdev cdev; /* char device */
+    /* for r/w operations */
+    char hello_buffer[HELLO_KERNEL_BUFF_LEN];
+    size_t buff_index;
+};
+
+/* function prototypes */
+int hello_debugfs(void);
 
 #endif