ohci: Rework bus glue integration to allow several at once

The previous model had the module_init & module_exit function in the
bus glue .c files themselves. That's a problem if several glues need
to be selected at once and the driver is built has module. This case
is quite common in embedded system where you want to handle both the
integrated ohci controller and some extra controller on PCI.

The ohci-hcd.c file now provide the module_init & module_exit and
appropriate driver registering/unregistering is done conditionally,
using #ifdefs.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 80 insertions, 12 deletions

diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index c1c1d871aba4..3f80003b40bd 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -855,63 +855,131 @@ MODULE_LICENSE ("GPL");
 
 #ifdef CONFIG_PCI
 #include "ohci-pci.c"
+#define PCI_DRIVER		ohci_pci_driver
 #endif
 
 #ifdef CONFIG_SA1111
 #include "ohci-sa1111.c"
+#define SA1111_DRIVER		ohci_hcd_sa1111_driver
 #endif
 
 #ifdef CONFIG_ARCH_S3C2410
 #include "ohci-s3c2410.c"
+#define PLATFORM_DRIVER		ohci_hcd_s3c2410_driver
 #endif
 
 #ifdef CONFIG_ARCH_OMAP
 #include "ohci-omap.c"
+#define PLATFORM_DRIVER		ohci_hcd_omap_driver
 #endif
 
 #ifdef CONFIG_ARCH_LH7A404
 #include "ohci-lh7a404.c"
+#define PLATFORM_DRIVER		ohci_hcd_lh7a404_driver
 #endif
 
 #ifdef CONFIG_PXA27x
 #include "ohci-pxa27x.c"
+#define PLATFORM_DRIVER		ohci_hcd_pxa27x_driver
 #endif
 
 #ifdef CONFIG_ARCH_EP93XX
 #include "ohci-ep93xx.c"
+#define PLATFORM_DRIVER		ohci_hcd_ep93xx_driver
 #endif
 
 #ifdef CONFIG_SOC_AU1X00
 #include "ohci-au1xxx.c"
+#define PLATFORM_DRIVER		ohci_hcd_au1xxx_driver
 #endif
 
 #ifdef CONFIG_PNX8550
 #include "ohci-pnx8550.c"
+#define PLATFORM_DRIVER		ohci_hcd_pnx8550_driver
 #endif
 
 #ifdef CONFIG_USB_OHCI_HCD_PPC_SOC
 #include "ohci-ppc-soc.c"
+#define PLATFORM_DRIVER		ohci_hcd_ppc_soc_driver
 #endif
 
 #ifdef CONFIG_ARCH_AT91
 #include "ohci-at91.c"
+#define PLATFORM_DRIVER		ohci_hcd_at91_driver
 #endif
 
 #ifdef CONFIG_ARCH_PNX4008
 #include "ohci-pnx4008.c"
+#define PLATFORM_DRIVER		usb_hcd_pnx4008_driver
 #endif
 
-#if !(defined(CONFIG_PCI) \
-      || defined(CONFIG_SA1111) \
-      || defined(CONFIG_ARCH_S3C2410) \
-      || defined(CONFIG_ARCH_OMAP) \
-      || defined (CONFIG_ARCH_LH7A404) \
-      || defined (CONFIG_PXA27x) \
-      || defined (CONFIG_ARCH_EP93XX) \
-      || defined (CONFIG_SOC_AU1X00) \
-      || defined (CONFIG_USB_OHCI_HCD_PPC_SOC) \
-      || defined (CONFIG_ARCH_AT91) \
-      || defined (CONFIG_ARCH_PNX4008) \
-	)
+
+#if	!defined(PCI_DRIVER) &&		\
+	!defined(PLATFORM_DRIVER) &&	\
+	!defined(SA1111_DRIVER)
 #error "missing bus glue for ohci-hcd"
 #endif
+
+static int __init ohci_hcd_mod_init(void)
+{
+	int retval = 0;
+	int ls = 0;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	printk (KERN_DEBUG "%s: " DRIVER_INFO "\n", hcd_name);
+	pr_debug ("%s: block sizes: ed %Zd td %Zd\n", hcd_name,
+		sizeof (struct ed), sizeof (struct td));
+
+#ifdef PLATFORM_DRIVER
+	retval = platform_driver_register(&PLATFORM_DRIVER);
+	if (retval < 0)
+		return retval;
+	ls++;
+#endif
+
+#ifdef SA1111_DRIVER
+	retval = sa1111_driver_register(&SA1111_DRIVER);
+	if (retval < 0)
+		goto error;
+	ls++;
+#endif
+
+#ifdef PCI_DRIVER
+	retval = pci_register_driver(&PCI_DRIVER);
+	if (retval < 0)
+		goto error;
+	ls++;
+#endif
+
+	return retval;
+
+	/* Error path */
+error:
+#ifdef PLATFORM_DRIVER
+	if (ls--)
+		platform_driver_unregister(&PLATFORM_DRIVER);
+#endif
+#ifdef SA1111_DRIVER
+	if (ls--)
+		sa1111_driver_unregister(&SA1111_DRIVER);
+#endif
+	return retval;
+}
+module_init(ohci_hcd_mod_init);
+
+static void __exit ohci_hcd_mod_exit(void)
+{
+#ifdef PCI_DRIVER
+	pci_unregister_driver(&PCI_DRIVER);
+#endif
+#ifdef SA1111_DRIVER
+	sa1111_driver_unregister(&SA1111_DRIVER);
+#endif
+#ifdef PLATFORM_DRIVER
+	platform_driver_unregister(&PLATFORM_DRIVER);
+#endif
+}
+module_exit(ohci_hcd_mod_exit);
+