support and doc for creating dkms debian package, added sysfs class f…

…ile for udev

Makefile

@@ -1,23 +1,20 @@
 ifeq ($(KERNELRELEASE),)
+#Outside Kbuild Part
 
-KERNELDIR ?= /usr/src/raspberry_kernel/linux-source-3.6.11+
-PWD := $(shell pwd)
+KDIR ?= /lib/modules/`uname -r`/build
+$(info Running Makefile outside Kbuild-System)
 
-.PHONY: build clean
-
-mod:
-	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+default:
+	$(MAKE) -C $(KDIR) M=$$PWD
 
 clean:
-	rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c
+	rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c modules.order Module.symvers .tmp_versions
 
-load:
-	-rmmod pinbus 
-	insmod pinbus.ko
-	-mknod /dev/pinbus c `grep pinbus /proc/devices | cut -d ' ' -f 1` 0
 else
+#Kbuild Part
 
 $(info Building with KERNELRELEASE = ${KERNELRELEASE})
 obj-m :=    pinbus.o
 
 endif
+

README.md

@@ -1,6 +1,5 @@
 # pinbus
 
-
 ## how to setup ubuntu
 
 ```
@@ -18,3 +17,18 @@ make scripts
 cd /module/dir/in/homeverzeichnis
 make
 ```
+
+## build dkms
+checkout this dir to /usr/src/pinbus-0.23
+sudo dkms add -m pinbus -v 0.23
+sudo dkms build -m pinbus -v 0.23
+
+
+## build debian dkms package
+sudo dkms mkdsc -m pinbus -v 0.23 --source-only
+sudo dkms mkdeb -m pinbus -v 0.23 --source-only
+
+cp  /var/lib/dkms/pinbus/0.23/deb/pinbus-dkms_0.23_all.deb .
+sudo dkms remove pinbus/0.23 --all
+sudo rm -rf /var/lib/dkms/pinbus/
+

dkms.conf

@@ -0,0 +1,10 @@
+PACKAGE_NAME="pinbus-dkms"
+PACKAGE_VERSION="0.23"
+CLEAN="rm -f *.*o"
+BUILT_MODULE_NAME=pinbus
+DEST_MODULE_LOCATION="/updates"
+REMAKE_INITRD="no"
+AUTOINSTALL="yes"
+
+#MAKE="make KERNELDIR=/lib/modules/${kernelver}/build"
+#BUILT_MODULE_LOCATION=src/

pinbus.c

@@ -1,11 +1,4 @@
 
-/* 
- * TODO:
- * start clock_irq only when device is open
- * global device pointer for free in module_exit
- *
- */
-
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/sched.h>
@@ -19,9 +12,11 @@
 #include <linux/slab.h>
 #include <linux/gpio.h>
 #include <linux/interrupt.h>
+#include <linux/device.h>
 
 /*------------------------------------------------------------------------------------------*\
 \*------------------------------------------------------------------------------------------*/
+#define DEVICE_NAME "pinbus"
 #define dbg(level, format, arg...) do { if ( unlikely(pinbus_enable_dbg >= level) ) printk(KERN_WARNING ":[%s]: " format "\n", __FUNCTION__, ##arg); } while ( 0 )
 
 #define NR_PINBUS_DEVS 1
@@ -71,6 +66,7 @@ struct pinbus_dev {
 };
 
 static struct pinbus_dev *g_pinbus_dev = NULL; 
+static struct class *pinbus_class = NULL;
 
 /*------------------------------------------------------------------------------------------*\
 \*------------------------------------------------------------------------------------------*/
@@ -191,7 +187,7 @@ static int pinbus_init(void){
 
     printk(KERN_INFO "Loading Pinbus Module\n");
 
-    result = alloc_chrdev_region(&dev, 0, NR_PINBUS_DEVS, "pinbus");
+    result = alloc_chrdev_region(&dev, 0, NR_PINBUS_DEVS, DEVICE_NAME);
     pinbus_major = MAJOR(dev);
     if (result < 0)
         return result;
@@ -206,6 +202,11 @@ static int pinbus_init(void){
     cdev_init(&g_pinbus_dev->cdev, &pinbus_fops);
     g_pinbus_dev->cdev.owner = THIS_MODULE;
     g_pinbus_dev->cdev.ops = &pinbus_fops;
+
+        /* register sysfs class for udev */
+    pinbus_class = class_create(THIS_MODULE, DEVICE_NAME);
+    device_create( pinbus_class, NULL, devno, NULL, DEVICE_NAME);
+
     atomic_set(&g_pinbus_dev->device_available, 1);
     init_waitqueue_head(&g_pinbus_dev->wait_for_data);
 
@@ -244,12 +245,19 @@ static int pinbus_init(void){
 
 static void pinbus_exit(void) {
 
+	int devno = MKDEV( pinbus_major, 0);
     printk(KERN_INFO "Shutting down Pinbus Module\n");
+
+    /* unregister sysfs class for udev */
+    device_destroy( pinbus_class, devno );
+    class_destroy( pinbus_class );
+    pinbus_class = NULL;
+
     free_irq(busy_irq_number, g_pinbus_dev);
     free_irq(stat_irq_number, g_pinbus_dev);
     cdev_del(&g_pinbus_dev->cdev);
     kfree(g_pinbus_dev);
-    unregister_chrdev_region(MKDEV (pinbus_major, 0), NR_PINBUS_DEVS);
+    unregister_chrdev_region( devno, NR_PINBUS_DEVS);
     printk(KERN_INFO "Shutting down Pinbus Module successful\n");
 
 }