[WATCHDOG] i6300esb.c: change platform_driver to pci_driver

Since the intel 6300esb platform uses a dedicated PCI ID for
it's watchdog timer (00:1d.4), it's better and easier to have
this as a pci_driver.
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/i6300esb.c

@@ -34,7 +34,6 @@
 #include <linux/mm.h>
 #include <linux/miscdevice.h>
 #include <linux/watchdog.h>
-#include <linux/platform_device.h>
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/ioport.h>
@@ -42,7 +41,7 @@
 #include <linux/io.h>
 
 /* Module and version information */
-#define ESB_VERSION "0.04"
+#define ESB_VERSION "0.05"
 #define ESB_MODULE_NAME "i6300ESB timer"
 #define ESB_DRIVER_NAME ESB_MODULE_NAME ", v" ESB_VERSION
 #define PFX ESB_MODULE_NAME ": "
@@ -82,7 +81,9 @@ static unsigned long timer_alive;
 static struct pci_dev *esb_pci;
 static unsigned short triggered; /* The status of the watchdog upon boot */
 static char esb_expect_close;
-static struct platform_device *esb_platform_device;
+
+/* We can only use 1 card due to the /dev/watchdog restriction */
+static int cards_found;
 
 /* module parameters */
 /* 30 sec default heartbeat (1 < heartbeat < 2*1023) */
@@ -332,11 +333,6 @@ static struct miscdevice esb_miscdev = {
 
 /*
  * Data for PCI driver interface
- *
- * This data only exists for exporting the supported
- * PCI ids via MODULE_DEVICE_TABLE.  We do not actually
- * register a pci_driver, because someone else might one day
- * want to register another driver on the same PCI id.
  */
 static struct pci_device_id esb_pci_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_9), },
@@ -348,29 +344,19 @@ MODULE_DEVICE_TABLE(pci, esb_pci_tbl);
  *      Init & exit routines
  */
 
-static unsigned char __devinit esb_getdevice(void)
+static unsigned char __devinit esb_getdevice(struct pci_dev *pdev)
 {
-	/*
-	 *      Find the PCI device
-	 */
-
-	esb_pci = pci_get_device(PCI_VENDOR_ID_INTEL,
-					PCI_DEVICE_ID_INTEL_ESB_9, NULL);
-
-	if (!esb_pci)
-		return 0;
-
-	if (pci_enable_device(esb_pci)) {
+	if (pci_enable_device(pdev)) {
 		printk(KERN_ERR PFX "failed to enable device\n");
 		goto err_devput;
 	}
 
-	if (pci_request_region(esb_pci, 0, ESB_MODULE_NAME)) {
+	if (pci_request_region(pdev, 0, ESB_MODULE_NAME)) {
 		printk(KERN_ERR PFX "failed to request region\n");
 		goto err_disable;
 	}
 
-	BASEADDR = pci_ioremap_bar(esb_pci, 0);
+	BASEADDR = pci_ioremap_bar(pdev, 0);
 	if (BASEADDR == NULL) {
 		/* Something's wrong here, BASEADDR has to be set */
 		printk(KERN_ERR PFX "failed to get BASEADDR\n");
@@ -378,14 +364,14 @@ static unsigned char __devinit esb_getdevice(void)
 	}
 
 	/* Done */
+	esb_pci = pdev;
 	return 1;
 
 err_release:
-	pci_release_region(esb_pci, 0);
+	pci_release_region(pdev, 0);
 err_disable:
-	pci_disable_device(esb_pci);
+	pci_disable_device(pdev);
 err_devput:
-	pci_dev_put(esb_pci);
 	return 0;
 }
 
@@ -430,12 +416,23 @@ static void __devinit esb_initdevice(void)
 	esb_timer_set_heartbeat(heartbeat);
 }
 
-static int __devinit esb_probe(struct platform_device *dev)
+static int __devinit esb_probe(struct pci_dev *pdev,
+		const struct pci_device_id *ent)
 {
 	int ret;
 
+	cards_found++;
+	if (cards_found == 1)
+		printk(KERN_INFO PFX "Intel 6300ESB WatchDog Timer Driver v%s\n",
+			ESB_VERSION);
+
+	if (cards_found > 1) {
+		printk(KERN_ERR PFX "This driver only supports 1 device\n");
+		return -ENODEV;
+	}
+
 	/* Check whether or not the hardware watchdog is there */
-	if (!esb_getdevice() || esb_pci == NULL)
+	if (!esb_getdevice(pdev) || esb_pci == NULL)
 		return -ENODEV;
 
 	/* Check that the heartbeat value is within it's range;
@@ -467,11 +464,11 @@ static int __devinit esb_probe(struct platform_device *dev)
 	iounmap(BASEADDR);
 	pci_release_region(esb_pci, 0);
 	pci_disable_device(esb_pci);
-	pci_dev_put(esb_pci);
+	esb_pci = NULL;
 	return ret;
 }
 
-static int __devexit esb_remove(struct platform_device *dev)
+static void __devexit esb_remove(struct pci_dev *pdev)
 {
 	/* Stop the timer before we leave */
 	if (!nowayout)
@@ -482,54 +479,30 @@ static int __devexit esb_remove(struct platform_device *dev)
 	iounmap(BASEADDR);
 	pci_release_region(esb_pci, 0);
 	pci_disable_device(esb_pci);
-	pci_dev_put(esb_pci);
-	return 0;
+	esb_pci = NULL;
 }
 
-static void esb_shutdown(struct platform_device *dev)
+static void esb_shutdown(struct pci_dev *pdev)
 {
 	esb_timer_stop();
 }
 
-static struct platform_driver esb_platform_driver = {
+static struct pci_driver esb_driver = {
+	.name		= ESB_MODULE_NAME,
+	.id_table	= esb_pci_tbl,
 	.probe          = esb_probe,
 	.remove         = __devexit_p(esb_remove),
 	.shutdown       = esb_shutdown,
-	.driver         = {
-		.owner  = THIS_MODULE,
-		.name   = ESB_MODULE_NAME,
-	},
 };
 
 static int __init watchdog_init(void)
 {
-	int err;
-
-	printk(KERN_INFO PFX "Intel 6300ESB WatchDog Timer Driver v%s\n",
-		ESB_VERSION);
-
-	err = platform_driver_register(&esb_platform_driver);
-	if (err)
-		return err;
-
-	esb_platform_device = platform_device_register_simple(ESB_MODULE_NAME,
-								-1, NULL, 0);
-	if (IS_ERR(esb_platform_device)) {
-		err = PTR_ERR(esb_platform_device);
-		goto unreg_platform_driver;
-	}
-
-	return 0;
-
-unreg_platform_driver:
-	platform_driver_unregister(&esb_platform_driver);
-	return err;
+	return pci_register_driver(&esb_driver);
 }
 
 static void __exit watchdog_cleanup(void)
 {
-	platform_device_unregister(esb_platform_device);
-	platform_driver_unregister(&esb_platform_driver);
+	pci_unregister_driver(&esb_driver);
 	printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
 }