[PATCH] chardev: GPIO for SCx200 & PC-8736x: add platform_device for use w dev_dbg

Adds platform-device to (just introduced) driver, and uses it to replace many
printks with dev_dbg() etc.  This could trivially be merged into previous
patch, but this way matches better with the corresponding patch that does the
same change to scx200_gpio.
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/pc8736x_gpio.c

@@ -17,13 +17,14 @@
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/nsc_gpio.h>
+#include <linux/platform_device.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 
-#define NAME "pc8736x_gpio"
+#define DEVNAME "pc8736x_gpio"
 
 MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
-MODULE_DESCRIPTION("NatSemi SCx200 GPIO Pin Driver");
+MODULE_DESCRIPTION("NatSemi PC-8736x GPIO Pin Driver");
 MODULE_LICENSE("GPL");
 
 static int major;		/* default to dynamic major */
@@ -42,6 +43,8 @@ static unsigned pc8736x_gpio_base;
 
 #define SIO_CF1		0x21	/* chip config, bit0 is chip enable */
 
+#define PC8736X_GPIO_SIZE	16
+
 #define SIO_UNIT_SEL	0x7	/* unit select reg */
 #define SIO_UNIT_ACT	0x30	/* unit enable */
 #define SIO_GPIO_UNIT	0x7	/* unit number of GPIO */
@@ -69,6 +72,8 @@ static int port_offset[] = { 0, 4, 8, 10 };	/* non-uniform offsets ! */
 #define PORT_EVT_EN	2
 #define PORT_EVT_STST	3
 
+static struct platform_device *pdev;  /* use in dev_*() */
+
 static inline void superio_outb(int addr, int val)
 {
 	outb_p(addr, superio_cmd);
@@ -148,7 +153,7 @@ static int pc8736x_gpio_get(unsigned minor)
 	val >>= bit;
 	val &= 1;
 
-	printk(KERN_INFO NAME ": _gpio_get(%d from %x bit %d) == val %d\n",
+	dev_dbg(&pdev->dev, "_gpio_get(%d from %x bit %d) == val %d\n",
 		minor, pc8736x_gpio_base + port_offset[port] + PORT_IN, bit,
 		val);
 
@@ -164,22 +169,21 @@ static void pc8736x_gpio_set(unsigned minor, int val)
 	bit = minor & 7;
 	curval = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_OUT);
 
-	printk(KERN_INFO NAME
-	       ": addr:%x cur:%x bit-pos:%d cur-bit:%x + new:%d -> bit-new:%d\n",
+	dev_dbg(&pdev->dev, "addr:%x cur:%x bit-pos:%d cur-bit:%x + new:%d -> bit-new:%d\n",
 		pc8736x_gpio_base + port_offset[port] + PORT_OUT,
 		curval, bit, (curval & ~(1 << bit)), val, (val << bit));
 
 	val = (curval & ~(1 << bit)) | (val << bit);
 
-	printk(KERN_INFO NAME ": gpio_set(minor:%d port:%d bit:%d"
-	       ") %2x -> %2x\n", minor, port, bit, curval, val);
+	dev_dbg(&pdev->dev, "gpio_set(minor:%d port:%d bit:%d)"
+		" %2x -> %2x\n", minor, port, bit, curval, val);
 
 	outb_p(val, pc8736x_gpio_base + port_offset[port] + PORT_OUT);
 
 	curval = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_OUT);
 	val = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_IN);
 
-	printk(KERN_INFO NAME ": wrote %x, read: %x\n", curval, val);
+	dev_dbg(&pdev->dev, "wrote %x, read: %x\n", curval, val);
 }
 
 static void pc8736x_gpio_set_high(unsigned index)
@@ -194,7 +198,7 @@ static void pc8736x_gpio_set_low(unsigned index)
 
 static int pc8736x_gpio_current(unsigned index)
 {
-	printk(KERN_WARNING NAME ": pc8736x_gpio_current unimplemented\n");
+	dev_warn(&pdev->dev, "pc8736x_gpio_current unimplemented\n");
 	return 0;
 }
 
@@ -222,7 +226,7 @@ static int pc8736x_gpio_open(struct inode *inode, struct file *file)
 	unsigned m = iminor(inode);
 	file->private_data = &pc8736x_access;
 
-	printk(KERN_NOTICE NAME " open %d\n", m);
+	dev_dbg(&pdev->dev, "open %d\n", m);
 
 	if (m > 63)
 		return -EINVAL;
@@ -238,13 +242,23 @@ static struct file_operations pc8736x_gpio_fops = {
 
 static int __init pc8736x_gpio_init(void)
 {
-	int r, rc;
+	int rc = 0;
+
+	pdev = platform_device_alloc(DEVNAME, 0);
+	if (!pdev)
+		return -ENOMEM;
 
-	printk(KERN_DEBUG NAME " initializing\n");
+	rc = platform_device_add(pdev);
+	if (rc) {
+		rc = -ENODEV;
+		goto undo_platform_dev_alloc;
+	}
+	dev_info(&pdev->dev, "NatSemi pc8736x GPIO Driver Initializing\n");
 
 	if (!pc8736x_superio_present()) {
-		printk(KERN_ERR NAME ": no device found\n");
-		return -ENODEV;
+		rc = -ENODEV;
+		dev_err(&pdev->dev, "no device found\n");
+		goto undo_platform_dev_add;
 	}
 
 	/* Verify that chip and it's GPIO unit are both enabled.
@@ -252,44 +266,56 @@ static int __init pc8736x_gpio_init(void)
 	 */
 	rc = superio_inb(SIO_CF1);
 	if (!(rc & 0x01)) {
-		printk(KERN_ERR NAME ": device not enabled\n");
-		return -ENODEV;
+		rc = -ENODEV;
+		dev_err(&pdev->dev, "device not enabled\n");
+		goto undo_platform_dev_add;
 	}
 	device_select(SIO_GPIO_UNIT);
 	if (!superio_inb(SIO_UNIT_ACT)) {
-		printk(KERN_ERR NAME ": GPIO unit not enabled\n");
-		return -ENODEV;
+		rc = -ENODEV;
+		dev_err(&pdev->dev, "GPIO unit not enabled\n");
+		goto undo_platform_dev_add;
 	}
 
-	/* read GPIO unit base address */
+	/* read the GPIO unit base addr that chip responds to */
 	pc8736x_gpio_base = (superio_inb(SIO_BASE_HADDR) << 8
 			     | superio_inb(SIO_BASE_LADDR));
 
-	if (request_region(pc8736x_gpio_base, 16, NAME))
-		printk(KERN_INFO NAME ": GPIO ioport %x reserved\n",
+	if (!request_region(pc8736x_gpio_base, 16, DEVNAME)) {
+		rc = -ENODEV;
+		dev_err(&pdev->dev, "GPIO ioport %x busy\n",
 			pc8736x_gpio_base);
+		goto undo_platform_dev_add;
+	}
+	dev_info(&pdev->dev, "GPIO ioport %x reserved\n", pc8736x_gpio_base);
 
-	r = register_chrdev(major, NAME, &pc8736x_gpio_fops);
-	if (r < 0) {
-		printk(KERN_ERR NAME ": unable to register character device\n");
-		return r;
+	rc = register_chrdev(major, DEVNAME, &pc8736x_gpio_fops);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "register-chrdev failed: %d\n", rc);
+		goto undo_platform_dev_add;
 	}
 	if (!major) {
-		major = r;
-		printk(KERN_DEBUG NAME ": got dynamic major %d\n", major);
+		major = rc;
+		dev_dbg(&pdev->dev, "got dynamic major %d\n", major);
 	}
 
 	pc8736x_init_shadow();
 	return 0;
+
+undo_platform_dev_add:
+	platform_device_put(pdev);
+undo_platform_dev_alloc:
+	kfree(pdev);
+	return rc;
 }
 
 static void __exit pc8736x_gpio_cleanup(void)
 {
-	printk(KERN_DEBUG NAME " cleanup\n");
+	dev_dbg(&pdev->dev, " cleanup\n");
 
 	release_region(pc8736x_gpio_base, 16);
 
-	unregister_chrdev(major, NAME);
+	unregister_chrdev(major, DEVNAME);
 }
 
 module_init(pc8736x_gpio_init);