[PATCH 1/2] hysdn: convert to PCI hotplug API

[Jeff Garzik <jeff@garzik.org>]

This patch has been committed to the 'hysdn' branch of
git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/misc-2.6.git

commit b025c86cba3bb9fd7218ce6e8a60f0c65b414d0c
Author: Jeff Garzik <jeff@garzik.org>
Date:   Thu Aug 2 18:51:14 2007 -0400

    [ISDN] hysdn: convert to PCI hotplug API
    
    Signed-off-by: Jeff Garzik <jeff@garzik.org>

 drivers/isdn/hysdn/hysdn_init.c |  274 ++++++++++++++++++----------------------
 1 file changed, 130 insertions(+), 144 deletions(-)

b025c86cba3bb9fd7218ce6e8a60f0c65b414d0c
diff --git a/drivers/isdn/hysdn/hysdn_init.c b/drivers/isdn/hysdn/hysdn_init.c
index 9e01748..b7cc5c2 100644
--- a/drivers/isdn/hysdn/hysdn_init.c
+++ b/drivers/isdn/hysdn/hysdn_init.c
@@ -20,10 +20,15 @@
 #include "hysdn_defs.h"
 
 static struct pci_device_id hysdn_pci_tbl[] = {
-	{PCI_VENDOR_ID_HYPERCOPE, PCI_DEVICE_ID_HYPERCOPE_PLX, PCI_ANY_ID, PCI_SUBDEVICE_ID_HYPERCOPE_METRO},
-	{PCI_VENDOR_ID_HYPERCOPE, PCI_DEVICE_ID_HYPERCOPE_PLX, PCI_ANY_ID, PCI_SUBDEVICE_ID_HYPERCOPE_CHAMP2},
-	{PCI_VENDOR_ID_HYPERCOPE, PCI_DEVICE_ID_HYPERCOPE_PLX, PCI_ANY_ID, PCI_SUBDEVICE_ID_HYPERCOPE_ERGO},
-	{PCI_VENDOR_ID_HYPERCOPE, PCI_DEVICE_ID_HYPERCOPE_PLX, PCI_ANY_ID, PCI_SUBDEVICE_ID_HYPERCOPE_OLD_ERGO},
+	{ PCI_VENDOR_ID_HYPERCOPE, PCI_DEVICE_ID_HYPERCOPE_PLX,
+	  PCI_ANY_ID, PCI_SUBDEVICE_ID_HYPERCOPE_METRO, 0, 0, BD_METRO },
+	{ PCI_VENDOR_ID_HYPERCOPE, PCI_DEVICE_ID_HYPERCOPE_PLX,
+	  PCI_ANY_ID, PCI_SUBDEVICE_ID_HYPERCOPE_CHAMP2, 0, 0, BD_CHAMP2 },
+	{ PCI_VENDOR_ID_HYPERCOPE, PCI_DEVICE_ID_HYPERCOPE_PLX,
+	  PCI_ANY_ID, PCI_SUBDEVICE_ID_HYPERCOPE_ERGO, 0, 0, BD_ERGO },
+	{ PCI_VENDOR_ID_HYPERCOPE, PCI_DEVICE_ID_HYPERCOPE_PLX,
+	  PCI_ANY_ID, PCI_SUBDEVICE_ID_HYPERCOPE_OLD_ERGO, 0, 0, BD_ERGO },
+
 	{ }				/* Terminating entry */
 };
 MODULE_DEVICE_TABLE(pci, hysdn_pci_tbl);
@@ -34,128 +39,7 @@ MODULE_LICENSE("GPL");
 static char *hysdn_init_revision = "$Revision: 1.6.6.6 $";
 static int cardmax;		/* number of found cards */
 hysdn_card *card_root = NULL;	/* pointer to first card */
-
-/**********************************************/
-/* table assigning PCI-sub ids to board types */
-/* the last entry contains all 0              */
-/**********************************************/
-static struct {
-	unsigned short subid;		/* PCI sub id */
-	unsigned char cardtyp;		/* card type assigned */
-} pci_subid_map[] = {
-
-	{
-		PCI_SUBDEVICE_ID_HYPERCOPE_METRO, BD_METRO
-	},
-	{
-		PCI_SUBDEVICE_ID_HYPERCOPE_CHAMP2, BD_CHAMP2
-	},
-	{
-		PCI_SUBDEVICE_ID_HYPERCOPE_ERGO, BD_ERGO
-	},
-	{
-		PCI_SUBDEVICE_ID_HYPERCOPE_OLD_ERGO, BD_ERGO
-	},
-	{
-		0, 0
-	}			/* terminating entry */
-};
-
-
-/*********************************************************************/
-/* search_cards searches for available cards in the pci config data. */
-/* If a card is found, the card structure is allocated and the cards */
-/* ressources are reserved. cardmax is incremented.                  */
-/*********************************************************************/
-static void
-search_cards(void)
-{
-	struct pci_dev *akt_pcidev = NULL;
-	hysdn_card *card, *card_last;
-	int i;
-
-	card_root = NULL;
-	card_last = NULL;
-	while ((akt_pcidev = pci_find_device(PCI_VENDOR_ID_HYPERCOPE, PCI_DEVICE_ID_HYPERCOPE_PLX,
-					     akt_pcidev)) != NULL) {
-		if (pci_enable_device(akt_pcidev))
-			continue;
-
-		if (!(card = kzalloc(sizeof(hysdn_card), GFP_KERNEL))) {
-			printk(KERN_ERR "HYSDN: unable to alloc device mem \n");
-			return;
-		}
-		card->myid = cardmax;	/* set own id */
-		card->bus = akt_pcidev->bus->number;
-		card->devfn = akt_pcidev->devfn;	/* slot + function */
-		card->subsysid = akt_pcidev->subsystem_device;
-		card->irq = akt_pcidev->irq;
-		card->iobase = pci_resource_start(akt_pcidev, PCI_REG_PLX_IO_BASE);
-		card->plxbase = pci_resource_start(akt_pcidev, PCI_REG_PLX_MEM_BASE);
-		card->membase = pci_resource_start(akt_pcidev, PCI_REG_MEMORY_BASE);
-		card->brdtype = BD_NONE;	/* unknown */
-		card->debug_flags = DEF_DEB_FLAGS;	/* set default debug */
-		card->faxchans = 0;	/* default no fax channels */
-		card->bchans = 2;	/* and 2 b-channels */
-		for (i = 0; pci_subid_map[i].subid; i++)
-			if (pci_subid_map[i].subid == card->subsysid) {
-				card->brdtype = pci_subid_map[i].cardtyp;
-				break;
-			}
-		if (card->brdtype != BD_NONE) {
-			if (ergo_inithardware(card)) {
-				printk(KERN_WARNING "HYSDN: card at io 0x%04x already in use\n", card->iobase);
-				kfree(card);
-				continue;
-			}
-		} else {
-			printk(KERN_WARNING "HYSDN: unknown card id 0x%04x\n", card->subsysid);
-			kfree(card);	/* release mem */
-			continue;
-		}
-		cardmax++;
-		card->next = NULL;	/*end of chain */
-		if (card_last)
-			card_last->next = card;		/* pointer to next card */
-		else
-			card_root = card;
-		card_last = card;	/* new chain end */
-	}			/* device found */
-}				/* search_cards */
-
-/************************************************************************************/
-/* free_resources frees the acquired PCI resources and returns the allocated memory */
-/************************************************************************************/
-static void
-free_resources(void)
-{
-	hysdn_card *card;
-
-	while (card_root) {
-		card = card_root;
-		if (card->releasehardware)
-			card->releasehardware(card);	/* free all hardware resources */
-		card_root = card_root->next;	/* remove card from chain */
-		kfree(card);	/* return mem */
-
-	}			/* while card_root */
-}				/* free_resources */
-
-/**************************************************************************/
-/* stop_cards disables (hardware resets) all cards and disables interrupt */
-/**************************************************************************/
-static void
-stop_cards(void)
-{
-	hysdn_card *card;
-
-	card = card_root;	/* first in chain */
-	while (card) {
-		if (card->stopcard)
-			card->stopcard(card);
-		card = card->next;	/* remove card from chain */
-	}			/* while card */
-}				/* stop_cards */
+static hysdn_card *card_last = NULL;	/* pointer to first card */
 
 
 /****************************************************************************/
@@ -191,31 +75,138 @@ hysdn_getrev(const char *revision)
 /* and the module is added to the list in /proc/modules, otherwise an error */
 /* is assumed and the module will not be kept in memory.                    */
 /****************************************************************************/
+
+static int __devinit hysdn_pci_init_one(struct pci_dev *akt_pcidev,
+					const struct pci_device_id *ent)
+{
+	hysdn_card *card;
+	int rc;
+
+	rc = pci_enable_device(akt_pcidev);
+	if (rc)
+		return rc;
+
+	if (!(card = kzalloc(sizeof(hysdn_card), GFP_KERNEL))) {
+		printk(KERN_ERR "HYSDN: unable to alloc device mem \n");
+		rc = -ENOMEM;
+		goto err_out;
+	}
+	card->myid = cardmax;	/* set own id */
+	card->bus = akt_pcidev->bus->number;
+	card->devfn = akt_pcidev->devfn;	/* slot + function */
+	card->subsysid = akt_pcidev->subsystem_device;
+	card->irq = akt_pcidev->irq;
+	card->iobase = pci_resource_start(akt_pcidev, PCI_REG_PLX_IO_BASE);
+	card->plxbase = pci_resource_start(akt_pcidev, PCI_REG_PLX_MEM_BASE);
+	card->membase = pci_resource_start(akt_pcidev, PCI_REG_MEMORY_BASE);
+	card->brdtype = BD_NONE;	/* unknown */
+	card->debug_flags = DEF_DEB_FLAGS;	/* set default debug */
+	card->faxchans = 0;	/* default no fax channels */
+	card->bchans = 2;	/* and 2 b-channels */
+	card->brdtype = ent->driver_data;
+
+	if (ergo_inithardware(card)) {
+		printk(KERN_WARNING "HYSDN: card at io 0x%04x already in use\n", card->iobase);
+		rc = -EBUSY;
+		goto err_out_card;
+	}
+
+	cardmax++;
+	card->next = NULL;	/*end of chain */
+	if (card_last)
+		card_last->next = card;		/* pointer to next card */
+	else
+		card_root = card;
+	card_last = card;	/* new chain end */
+
+	pci_set_drvdata(akt_pcidev, card);
+	return 0;
+
+err_out_card:
+	kfree(card);
+err_out:
+	pci_disable_device(akt_pcidev);
+	return rc;
+}
+
+static void __devexit hysdn_pci_remove_one(struct pci_dev *akt_pcidev)
+{
+	hysdn_card *card = pci_get_drvdata(akt_pcidev);
+
+	pci_set_drvdata(akt_pcidev, NULL);
+
+	if (card->stopcard)
+		card->stopcard(card);
+
+#ifdef CONFIG_HYSDN_CAPI
+	hycapi_capi_release(card);
+#endif
+
+	if (card->releasehardware)
+		card->releasehardware(card);   /* free all hardware resources */
+
+	if (card == card_root) {
+		card_root = card_root->next;
+		if (!card_root)
+			card_last = NULL;
+	} else {
+		hysdn_card *tmp = card_root;
+		while (tmp) {
+			if (tmp->next == card)
+				tmp->next = card->next;
+			card_last = tmp;
+			tmp = tmp->next;
+		}
+	}
+
+	kfree(card);
+	pci_disable_device(akt_pcidev);
+}
+
+static struct pci_driver hysdn_pci_driver = {
+	.name		= "hysdn",
+	.id_table	= hysdn_pci_tbl,
+	.probe		= hysdn_pci_init_one,
+	.remove		= __devexit_p(hysdn_pci_remove_one),
+};
+
+static int hysdn_have_procfs;
+
 static int __init
 hysdn_init(void)
 {
 	char tmp[50];
+	int rc;
 
 	strcpy(tmp, hysdn_init_revision);
 	printk(KERN_NOTICE "HYSDN: module Rev: %s loaded\n", hysdn_getrev(tmp));
 	strcpy(tmp, hysdn_net_revision);
 	printk(KERN_NOTICE "HYSDN: network interface Rev: %s \n", hysdn_getrev(tmp));
-	search_cards();
+
+	rc = pci_register_driver(&hysdn_pci_driver);
+	if (rc)
+		return rc;
+
 	printk(KERN_INFO "HYSDN: %d card(s) found.\n", cardmax);
 
-	if (hysdn_procconf_init()) {
-		free_resources();	/* proc file_sys not created */
-		return (-1);
-	}
+	if (!hysdn_procconf_init())
+		hysdn_have_procfs = 1;
+
 #ifdef CONFIG_HYSDN_CAPI
 	if(cardmax > 0) {
 		if(hycapi_init()) {
 			printk(KERN_ERR "HYCAPI: init failed\n");
-			return(-1);
+
+			if (hysdn_have_procfs)
+				hysdn_procconf_release();
+
+			pci_unregister_driver(&hysdn_pci_driver);
+			return -ESPIPE;
 		}
 	}
 #endif /* CONFIG_HYSDN_CAPI */
-	return (0);		/* no error */
+
+	return 0;		/* no error */
 }				/* init_module */
 
 
@@ -230,20 +221,15 @@ hysdn_init(void)
 static void __exit
 hysdn_exit(void)
 {
+	if (hysdn_have_procfs)
+		hysdn_procconf_release();
+
+	pci_unregister_driver(&hysdn_pci_driver);
+
 #ifdef CONFIG_HYSDN_CAPI
-	hysdn_card *card;
-#endif /* CONFIG_HYSDN_CAPI */
-	stop_cards();
-#ifdef CONFIG_HYSDN_CAPI
-	card = card_root;	/* first in chain */
-	while (card) {
-		hycapi_capi_release(card);
-		card = card->next;	/* remove card from chain */
-	}			/* while card */
 	hycapi_cleanup();
 #endif /* CONFIG_HYSDN_CAPI */
-	hysdn_procconf_release();
-	free_resources();
+
 	printk(KERN_NOTICE "HYSDN: module unloaded\n");
 }				/* cleanup_module */
 
-
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