[Qemu-devel] sysfs patch for kqemu

[Matthew Mastracci <matt@aclaro.com>]

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Here's a patch for supporting sysfs and udev.  There's no conditional 
logic - it needs the sysfs stuff to be present in the kernel headers. 
It dynamically allocates a major number and stuffs it into a global 
variable and uses that to register a device with sysfs.  udev will then 
pick up the new device and automatically create a new "kqemu" device node.

Matt.


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--- kqemu/kmod.c	2005-02-10 15:09:09.000000000 -0700
+++ qemu/kqemu/kmod.c	2005-02-13 18:19:14.833684304 -0700
@@ -11,6 +11,7 @@
 #include <linux/version.h>
 #include <linux/ioctl.h>
 #include <linux/smp_lock.h>
+#include <linux/device.h>
 #include <asm/atomic.h>
 #include <asm/processor.h>
 #include <asm/uaccess.h>
@@ -34,6 +35,9 @@
 int page_alloc_count;
 #endif
 
+struct class_simple *kqemu_class;
+int kqemu_major;
+
 /* lock the page at virtual address 'user_addr' and return its
    page index. Return -1 if error */
 unsigned long CDECL kqemu_lock_user_page(unsigned long user_addr)
@@ -297,9 +301,12 @@
 
     ret = register_chrdev(KQEMU_MAJOR, "kqemu", &kqemu_fops);
     if (ret < 0) {
-        printk("kqemu: could not get major %d\n", KQEMU_MAJOR);
+        printk("kqemu: could not get major\n");
         return ret;
     }
+    kqemu_major = ret;
+    kqemu_class = class_simple_create(THIS_MODULE, "kqemu");
+    class_simple_device_add(kqemu_class, MKDEV(kqemu_major,0), NULL, "kqemu");
     printk("KQEMU installed, max_instances=%d max_locked_mem=%dkB.\n",
            KQEMU_MAX_INSTANCES, 
            max_locked_pages * 4);
@@ -308,5 +315,7 @@
 
 void cleanup_module(void)
 {
-    unregister_chrdev(KQEMU_MAJOR, "kqemu");
+    class_simple_device_remove(MKDEV(kqemu_major,0));
+    class_simple_destroy(kqemu_class);
+    unregister_chrdev(kqemu_major, "kqemu");
 }