[Linux-parport] [PATCH] register sysfs device for lp devices

[Bernhard R. Link]

Give class_device_create a device pointer parport drivers
can set via a new parport_set_dev.
Also patch parport_gsci and parport_pc as example.

Signed-of-by: Bernhard R Link <brlink at debian.org>

---

Compile and run-tested with linux-2.6.16-rc3-git4.

Index: mlinux-2.6.15-git12/drivers/char/lp.c
===================================================================
--- mlinux-2.6.15-git12.orig/drivers/char/lp.c	2006-02-10 08:22:48.000000000 +0100
+++ mlinux-2.6.15-git12/drivers/char/lp.c	2006-02-13 14:46:29.000000000 +0100
@@ -805,7 +805,7 @@
 	if (reset)
 		lp_reset(nr);
 
-	class_device_create(lp_class, NULL, MKDEV(LP_MAJOR, nr), NULL,
+	class_device_create(lp_class, NULL, MKDEV(LP_MAJOR, nr), port->dev,
 				"lp%d", nr);
 	devfs_mk_cdev(MKDEV(LP_MAJOR, nr), S_IFCHR | S_IRUGO | S_IWUGO,
 			"printers/%d", nr);
Index: mlinux-2.6.15-git12/drivers/parport/parport_gsc.c
===================================================================
--- mlinux-2.6.15-git12.orig/drivers/parport/parport_gsc.c	2006-02-13 14:27:53.000000000 +0100
+++ mlinux-2.6.15-git12/drivers/parport/parport_gsc.c	2006-02-13 14:46:29.000000000 +0100
@@ -340,6 +340,9 @@
 	parport_gsc_write_data(p, 0);
 	parport_gsc_data_forward (p);
 
+	/* Tell sysfs which device is behind this parport */
+	parport_set_dev (p, &dev->dev);
+
 	/* Now that we've told the sharing engine about the port, and
 	   found out its characteristics, let the high-level drivers
 	   know about it. */
Index: mlinux-2.6.15-git12/drivers/parport/parport_pc.c
===================================================================
--- mlinux-2.6.15-git12.orig/drivers/parport/parport_pc.c	2006-02-13 14:30:26.000000000 +0100
+++ mlinux-2.6.15-git12/drivers/parport/parport_pc.c	2006-02-13 14:46:29.000000000 +0100
@@ -2340,6 +2340,7 @@
 	spin_lock(&ports_lock);
 	list_add(&priv->list, &ports_list);
 	spin_unlock(&ports_lock);
+	parport_set_dev (p, &dev->dev);
 	parport_announce_port (p);
 
 	return p;
Index: mlinux-2.6.15-git12/drivers/parport/share.c
===================================================================
--- mlinux-2.6.15-git12.orig/drivers/parport/share.c	2006-02-13 14:30:26.000000000 +0100
+++ mlinux-2.6.15-git12/drivers/parport/share.c	2006-02-13 14:46:29.000000000 +0100
@@ -341,6 +341,11 @@
 
 	tmp->waithead = tmp->waittail = NULL;
 
+	/*
+	 * no sysfs device known unless the announcer sets it before
+	 */
+	tmp->dev = NULL;
+
 	return tmp;
 }
 
Index: mlinux-2.6.15-git12/include/linux/parport.h
===================================================================
--- mlinux-2.6.15-git12.orig/include/linux/parport.h	2006-02-13 14:30:42.000000000 +0100
+++ mlinux-2.6.15-git12/include/linux/parport.h	2006-02-13 14:46:29.000000000 +0100
@@ -258,6 +258,7 @@
 	struct semaphore irq;
 };
 
+struct device;
 /* A parallel port */
 struct parport {
 	unsigned long base;	/* base address */
@@ -313,6 +314,8 @@
 
 	struct list_head full_list;
 	struct parport *slaves[3];
+
+	struct device *dev; /* for the sysfs device symlink */
 };
 
 #define DEFAULT_SPIN_TIME 500 /* us */
@@ -331,6 +334,10 @@
 struct parport *parport_register_port(unsigned long base, int irq, int dma,
 				      struct parport_operations *ops);
 
+/* parport_set_dev set the generic device behind this port, so drivers
+ * can display it in their sysfs nodes */
+#define parport_set_dev(port,devptr) ((port)->dev = (devptr))
+
 /* Once a registered port is ready for high-level drivers to use, the
    low-level driver that registered it should announce it.  This will
    call the high-level drivers' attach() functions (after things like