Register number of devices.

diff --git a/Makefile b/Makefile
new file mode 100644 (file)
index 0000000..05bc093
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+ifneq ($(KERNELRELEASE),)
+       obj-m := hellochar.o
+else
+       KERNELDIR ?= /lib/modules/`uname -r`/build
+       PWD = `pwd`
+
+default:
+       make -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+       make -C $(KERNELDIR) M=$(PWD) clean
+
+endif

diff --git a/hellochar.c b/hellochar.c
new file mode 100644 (file)
index 0000000..576968b
--- /dev/null
+++ b/hellochar.c
@@ -0,0 +1,41 @@
+/*
+ *  Copyright (C) 2010  Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+
+MODULE_LICENSE("GPL");
+static int major = 10;
+module_param_named(major, major, int, S_IRUGO | S_IWUSR);
+
+static int __init ch_init(void)
+{
+       int r;
+       r = register_chrdev_region(MKDEV(major, 0), 256, "hello");
+       if (r)
+               return r;
+       return 0;
+}
+
+static void __exit ch_exit(void)
+{
+       unregister_chrdev_region(MKDEV(major, 0), 256);
+}
+
+module_init(ch_init);
+module_exit(ch_exit);