[PATCH] add class support to dsp56k.c

Here is a patch that adds sysfs class support to /drivers/char/dsp56k.c

drivers/char/dsp56k.c

@@ -35,6 +35,7 @@
 #include <linux/init.h>
 #include <linux/devfs_fs_kernel.h>
 #include <linux/smp_lock.h>
+#include <linux/device.h>
 
 #include <asm/atarihw.h>
 #include <asm/traps.h>
@@ -149,6 +150,8 @@ static struct dsp56k_device {
 	int tx_wsize, rx_wsize;
 } dsp56k;
 
+static struct class_simple *dsp56k_class;
+
 static int dsp56k_reset(void)
 {
 	u_char status;
@@ -502,6 +505,8 @@ static char banner[] __initdata = KERN_INFO "DSP56k driver installed\n";
 
 static int __init dsp56k_init_driver(void)
 {
+	int err = 0;
+
 	if(!MACH_IS_ATARI || !ATARIHW_PRESENT(DSP56K)) {
 		printk("DSP56k driver: Hardware not present\n");
 		return -ENODEV;
@@ -511,17 +516,35 @@ static int __init dsp56k_init_driver(void)
 		printk("DSP56k driver: Unable to register driver\n");
 		return -ENODEV;
 	}
+	dsp56k_class = class_simple_create(THIS_MODULE, "dsp56k");
+	if (IS_ERR(dsp56k_class)) {
+		err = PTR_ERR(dsp56k_class);
+		goto out_chrdev;
+	}
+	class_simple_device_add(dsp56k_class, MKDEV(DSP56K_MAJOR, 0), NULL, "dsp56k");
 
-	devfs_mk_cdev(MKDEV(DSP56K_MAJOR, 0),
+	err = devfs_mk_cdev(MKDEV(DSP56K_MAJOR, 0),
 		      S_IFCHR | S_IRUSR | S_IWUSR, "dsp56k");
+	if(err)
+		goto out_class;
 
 	printk(banner);
-	return 0;
+	goto out;
+
+out_class:
+	class_simple_device_remove(MKDEV(DSP56K_MAJOR, 0));
+	class_simple_destroy(dsp56k_class);
+out_chrdev:
+	unregister_chrdev(DSP56K_MAJOR, "dsp56k");
+out:
+	return err;
 }
 module_init(dsp56k_init_driver);
 
 static void __exit dsp56k_cleanup_driver(void)
 {
+	class_simple_device_remove(MKDEV(DSP56K_MAJOR, 0));
+	class_simple_destroy(dsp56k_class);
 	unregister_chrdev(DSP56K_MAJOR, "dsp56k");
 	devfs_remove("dsp56k");
 }