usb: fotg210: Compile into one module

It is since ages perfectly possible to compile both of these
modules into the same kernel, which makes no sense since it
is one piece of hardware.

Compile one module named "fotg210.ko" for both HCD and UDC
drivers by collecting the init calls into a fotg210-core.c
file and start to centralize things handling one and the same
piece of hardware.

Stub out the initcalls if one or the other part of the driver
was not selected.

Tested by compiling one or the other or both of the drivers
into the kernel and as modules.

Cc: Fabian Vogt <fabian@ritter-vogt.de>
Cc: Yuan-Hsin Chen <yhchen@faraday-tech.com>
Cc: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221023144708.3596563-2-linus.walleij@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 42 deletions

diff --git a/drivers/usb/fotg210/fotg210-hcd.c b/drivers/usb/fotg210/fotg210-hcd.c
index 8fbf63e76d7d..51ac93a2eb98 100644
--- a/drivers/usb/fotg210/fotg210-hcd.c
+++ b/drivers/usb/fotg210/fotg210-hcd.c
@@ -39,8 +39,8 @@
 #include <asm/irq.h>
 #include <asm/unaligned.h>
 
-#define DRIVER_AUTHOR "Yuan-Hsin Chen"
-#define DRIVER_DESC "FOTG210 Host Controller (EHCI) Driver"
+#include "fotg210.h"
+
 static const char hcd_name[] = "fotg210_hcd";
 
 #undef FOTG210_URB_TRACE
@@ -5490,9 +5490,6 @@ static int fotg210_get_frame(struct usb_hcd *hcd)
  * functions  and in order to facilitate role switching we cannot
  * give the fotg210 driver exclusive access to those.
  */
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_LICENSE("GPL");
 
 static const struct hc_driver fotg210_fotg210_hc_driver = {
 	.description		= hcd_name,
@@ -5560,7 +5557,7 @@ static void fotg210_init(struct fotg210_hcd *fotg210)
  * then invokes the start() method for the HCD associated with it
  * through the hotplug entry's driver_data.
  */
-static int fotg210_hcd_probe(struct platform_device *pdev)
+int fotg210_hcd_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct usb_hcd *hcd;
@@ -5652,7 +5649,7 @@ fail_create_hcd:
  * @dev: USB Host Controller being removed
  *
  */
-static int fotg210_hcd_remove(struct platform_device *pdev)
+int fotg210_hcd_remove(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
 	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
@@ -5668,27 +5665,8 @@ static int fotg210_hcd_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_OF
-static const struct of_device_id fotg210_of_match[] = {
-	{ .compatible = "faraday,fotg210" },
-	{},
-};
-MODULE_DEVICE_TABLE(of, fotg210_of_match);
-#endif
-
-static struct platform_driver fotg210_hcd_driver = {
-	.driver = {
-		.name   = "fotg210-hcd",
-		.of_match_table = of_match_ptr(fotg210_of_match),
-	},
-	.probe  = fotg210_hcd_probe,
-	.remove = fotg210_hcd_remove,
-};
-
-static int __init fotg210_hcd_init(void)
+int __init fotg210_hcd_init(void)
 {
-	int retval = 0;
-
 	if (usb_disabled())
 		return -ENODEV;
 
@@ -5704,24 +5682,11 @@ static int __init fotg210_hcd_init(void)
 
 	fotg210_debug_root = debugfs_create_dir("fotg210", usb_debug_root);
 
-	retval = platform_driver_register(&fotg210_hcd_driver);
-	if (retval < 0)
-		goto clean;
-	return retval;
-
-clean:
-	debugfs_remove(fotg210_debug_root);
-	fotg210_debug_root = NULL;
-
-	clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
-	return retval;
+	return 0;
 }
-module_init(fotg210_hcd_init);
 
-static void __exit fotg210_hcd_cleanup(void)
+void __exit fotg210_hcd_cleanup(void)
 {
-	platform_driver_unregister(&fotg210_hcd_driver);
 	debugfs_remove(fotg210_debug_root);
 	clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
 }
-module_exit(fotg210_hcd_cleanup);