display7seg: Convert to pure OF device driver.

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/sbus/char/display7seg.c

-/* $Id: display7seg.c,v 1.6 2002/01/08 16:00:16 davem Exp $
- *
- * display7seg - Driver implementation for the 7-segment display
+/* display7seg.c - Driver implementation for the 7-segment display
  *                 present on Sun Microsystems CP1400 and CP1500
  *
  * Copyright (c) 2000 Eric Brower (ebrower@usa.net)
- *
  */
 
 #include <linux/kernel.h>
@@ -16,22 +13,20 @@
 #include <linux/miscdevice.h>
 #include <linux/ioport.h>		/* request_region */
 #include <linux/smp_lock.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <asm/atomic.h>
-#include <asm/ebus.h>			/* EBus device					*/
-#include <asm/oplib.h>			/* OpenProm Library 			*/
 #include <asm/uaccess.h>		/* put_/get_user			*/
 #include <asm/io.h>
 
 #include <asm/display7seg.h>
 
 #define D7S_MINOR	193
-#define D7S_OBPNAME	"display7seg"
-#define D7S_DEVNAME "d7s"
+#define DRIVER_NAME	"d7s"
+#define PFX		DRIVER_NAME ": "
 
 static int sol_compat = 0;		/* Solaris compatibility mode	*/
 
-#ifdef MODULE
-
 /* Solaris compatibility flag -
  * The Solaris implementation omits support for several
  * documented driver features (ref Sun doc 806-0180-03).  
@@ -46,20 +41,20 @@ static int sol_compat = 0;		/* Solaris compatibility mode	*/
  * If you wish the device to operate as under Solaris,
  * omitting above features, set this parameter to non-zero.
  */
-module_param
-	(sol_compat, int, 0);
-MODULE_PARM_DESC
-	(sol_compat, 
+module_param(sol_compat, int, 0);
+MODULE_PARM_DESC(sol_compat, 
 		 "Disables documented functionality omitted from Solaris driver");
 
-MODULE_AUTHOR
-	("Eric Brower <ebrower@usa.net>");
-MODULE_DESCRIPTION
-	("7-Segment Display driver for Sun Microsystems CP1400/1500");
+MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
+MODULE_DESCRIPTION("7-Segment Display driver for Sun Microsystems CP1400/1500");
 MODULE_LICENSE("GPL");
-MODULE_SUPPORTED_DEVICE
-	("d7s");
-#endif /* ifdef MODULE */
+MODULE_SUPPORTED_DEVICE("d7s");
+
+struct d7s {
+	void __iomem	*regs;
+	bool		flipped;
+};
+struct d7s *d7s_device;
 
 /*
  * Register block address- see header for details
@@ -72,22 +67,6 @@ MODULE_SUPPORTED_DEVICE
  * FLIP		- Inverts display for upside-down mounted board
  * bits 0-4	- 7-segment display contents
  */
-static void __iomem* d7s_regs;
-
-static inline void d7s_free(void)
-{
-	iounmap(d7s_regs);
-}
-
-static inline int d7s_obpflipped(void)
-{
-	int opt_node;
-
-	opt_node = prom_getchild(prom_root_node);
-	opt_node = prom_searchsiblings(opt_node, "options");
-	return ((-1 != prom_getintdefault(opt_node, "d7s-flipped?", -1)) ? 0 : 1);
-}
-
 static atomic_t d7s_users = ATOMIC_INIT(0);
 
 static int d7s_open(struct inode *inode, struct file *f)
@@ -106,12 +85,15 @@ static int d7s_release(struct inode *inode, struct file *f)
 	 * are not operating in solaris-compat mode
 	 */
 	if (atomic_dec_and_test(&d7s_users) && !sol_compat) {
-		int regval = 0;
-
-		regval = readb(d7s_regs);
-		(0 == d7s_obpflipped())	? 
-			writeb(regval |= D7S_FLIP,  d7s_regs): 
-			writeb(regval &= ~D7S_FLIP, d7s_regs);
+		struct d7s *p = d7s_device;
+		u8 regval = 0;
+
+		regval = readb(p->regs);
+		if (p->flipped)
+			regval |= D7S_FLIP;
+		else
+			regval &= ~D7S_FLIP;
+		writeb(regval, p->regs);
 	}
 
 	return 0;
@@ -119,9 +101,10 @@ static int d7s_release(struct inode *inode, struct file *f)
 
 static long d7s_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
-	__u8 regs = readb(d7s_regs);
-	__u8 ireg = 0;
+	struct d7s *p = d7s_device;
+	u8 regs = readb(p->regs);
 	int error = 0;
+	u8 ireg = 0;
 
 	if (D7S_MINOR != iminor(file->f_path.dentry->d_inode))
 		return -ENODEV;
@@ -129,18 +112,20 @@ static long d7s_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	lock_kernel();
 	switch (cmd) {
 	case D7SIOCWR:
-		/* assign device register values
-		 * we mask-out D7S_FLIP if in sol_compat mode
+		/* assign device register values we mask-out D7S_FLIP
+		 * if in sol_compat mode
 		 */
 		if (get_user(ireg, (int __user *) arg)) {
 			error = -EFAULT;
 			break;
 		}
-		if (0 != sol_compat) {
-			(regs & D7S_FLIP) ? 
-				(ireg |= D7S_FLIP) : (ireg &= ~D7S_FLIP);
+		if (sol_compat) {
+			if (regs & D7S_FLIP)
+				ireg |= D7S_FLIP;
+			else
+				ireg &= ~D7S_FLIP;
 		}
-		writeb(ireg, d7s_regs);
+		writeb(ireg, p->regs);
 		break;
 
 	case D7SIOCRD:
@@ -158,9 +143,11 @@ static long d7s_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 	case D7SIOCTM:
 		/* toggle device mode-- flip display orientation */
-		(regs & D7S_FLIP) ? 
-			(regs &= ~D7S_FLIP) : (regs |= D7S_FLIP);
-		writeb(regs, d7s_regs);
+		if (regs & D7S_FLIP)
+			regs &= ~D7S_FLIP;
+		else
+			regs |= D7S_FLIP;
+		writeb(regs, p->regs);
 		break;
 	};
 	unlock_kernel();
@@ -176,69 +163,123 @@ static const struct file_operations d7s_fops = {
 	.release =		d7s_release,
 };
 
-static struct miscdevice d7s_miscdev = { D7S_MINOR, D7S_DEVNAME, &d7s_fops };
+static struct miscdevice d7s_miscdev = {
+	.minor		= D7S_MINOR,
+	.name		= DRIVER_NAME,
+	.fops		= &d7s_fops
+};
 
-static int __init d7s_init(void)
+static int __devinit d7s_probe(struct of_device *op,
+			       const struct of_device_id *match)
 {
-	struct linux_ebus *ebus = NULL;
-	struct linux_ebus_device *edev = NULL;
-	int iTmp = 0, regs = 0;
-
-	for_each_ebus(ebus) {
-		for_each_ebusdev(edev, ebus) {
-			if (!strcmp(edev->prom_node->name, D7S_OBPNAME))
-				goto ebus_done;
-		}
-	}
-
-ebus_done:
-	if(!edev) {
-		printk("%s: unable to locate device\n", D7S_DEVNAME);
-		return -ENODEV;
+	struct device_node *opts;
+	int err = -EINVAL;
+	struct d7s *p;
+	u8 regs;
+
+	if (d7s_device)
+		goto out;
+
+	p = kzalloc(sizeof(*p), GFP_KERNEL);
+	err = -ENOMEM;
+	if (!p)
+		goto out;
+
+	p->regs = of_ioremap(&op->resource[0], 0, sizeof(u8), "d7s");
+	if (!p->regs) {
+		printk(KERN_ERR PFX "Cannot map chip registers\n");
+		goto out_free;
 	}
 
-	d7s_regs = ioremap(edev->resource[0].start, sizeof(__u8));
-
-	iTmp = misc_register(&d7s_miscdev);
-	if (0 != iTmp) {
-		printk("%s: unable to acquire miscdevice minor %i\n",
-		       D7S_DEVNAME, D7S_MINOR);
-		iounmap(d7s_regs);
-		return iTmp;
+	err = misc_register(&d7s_miscdev);
+	if (err) {
+		printk(KERN_ERR PFX "Unable to acquire miscdevice minor %i\n",
+		       D7S_MINOR);
+		goto out_iounmap;
 	}
 
-	/* OBP option "d7s-flipped?" is honored as default
-	 * for the device, and reset default when detached
+	/* OBP option "d7s-flipped?" is honored as default for the
+	 * device, and reset default when detached
 	 */
-	regs = readb(d7s_regs);
-	iTmp = d7s_obpflipped();
-	(0 == iTmp) ? 
-		writeb(regs |= D7S_FLIP,  d7s_regs): 
-		writeb(regs &= ~D7S_FLIP, d7s_regs);
-
-	printk("%s: 7-Segment Display%s at 0x%lx %s\n", 
-	       D7S_DEVNAME,
-	       (0 == iTmp) ? (" (FLIPPED)") : (""),
-	       edev->resource[0].start,
-	       (0 != sol_compat) ? ("in sol_compat mode") : (""));
-
-	return 0;
+	regs = readb(p->regs);
+	opts = of_find_node_by_path("/options");
+	if (opts &&
+	    of_get_property(opts, "d7s-flipped?", NULL))
+		p->flipped = true;
+
+	if (p->flipped)
+		regs |= D7S_FLIP;
+	else
+		regs &= ~D7S_FLIP;
+
+	writeb(regs,  p->regs);
+
+	printk(KERN_INFO PFX "7-Segment Display%s at [%s:0x%lx] %s\n", 
+	       op->node->full_name,
+	       (regs & D7S_FLIP) ? " (FLIPPED)" : "",
+	       op->resource[0].start,
+	       sol_compat ? "in sol_compat mode" : "");
+
+	dev_set_drvdata(&op->dev, p);
+	d7s_device = p;
+	err = 0;
+
+out:
+	return err;
+
+out_iounmap:
+	of_iounmap(&op->resource[0], p->regs, sizeof(u8));
+
+out_free:
+	kfree(p);
+	goto out;
 }
 
-static void __exit d7s_cleanup(void)
+static int __devexit d7s_remove(struct of_device *op)
 {
-	int regs = readb(d7s_regs);
+	struct d7s *p = dev_get_drvdata(&op->dev);
+	u8 regs = readb(p->regs);
 
 	/* Honor OBP d7s-flipped? unless operating in solaris-compat mode */
-	if (0 == sol_compat) {
-		(0 == d7s_obpflipped())	? 
-			writeb(regs |= D7S_FLIP,  d7s_regs):
-			writeb(regs &= ~D7S_FLIP, d7s_regs);
+	if (sol_compat) {
+		if (p->flipped)
+			regs |= D7S_FLIP;
+		else
+			regs &= ~D7S_FLIP;
+		writeb(regs, p->regs);
 	}
 
 	misc_deregister(&d7s_miscdev);
-	d7s_free();
+	of_iounmap(&op->resource[0], p->regs, sizeof(u8));
+	kfree(p);
+
+	return 0;
+}
+
+static struct of_device_id d7s_match[] = {
+	{
+		.name = "display7seg",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, d7s_match);
+
+static struct of_platform_driver d7s_driver = {
+	.name		= DRIVER_NAME,
+	.match_table	= d7s_match,
+	.probe		= d7s_probe,
+	.remove		= __devexit_p(d7s_remove),
+};
+
+static int __init d7s_init(void)
+{
+	return of_register_driver(&d7s_driver, &of_bus_type);
+}
+
+static void __exit d7s_exit(void)
+{
+	of_unregister_driver(&d7s_driver);
 }
 
 module_init(d7s_init);
-module_exit(d7s_cleanup);
+module_exit(d7s_exit);