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, 79 insertions, 0 deletions

diff --git a/drivers/usb/fotg210/fotg210-core.c b/drivers/usb/fotg210/fotg210-core.c
new file mode 100644
index 000000000000..ab7b8974bc18
--- /dev/null
+++ b/drivers/usb/fotg210/fotg210-core.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Central probing code for the FOTG210 dual role driver
+ * We register one driver for the hardware and then we decide
+ * whether to proceed with probing the host or the peripheral
+ * driver.
+ */
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/usb.h>
+
+#include "fotg210.h"
+
+static int fotg210_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	if (IS_ENABLED(CONFIG_USB_FOTG210_HCD)) {
+		ret = fotg210_hcd_probe(pdev);
+		if (ret)
+			return ret;
+	}
+	if (IS_ENABLED(CONFIG_USB_FOTG210_UDC))
+		ret = fotg210_udc_probe(pdev);
+
+	return ret;
+}
+
+static int fotg210_remove(struct platform_device *pdev)
+{
+	if (IS_ENABLED(CONFIG_USB_FOTG210_HCD))
+		fotg210_hcd_remove(pdev);
+	if (IS_ENABLED(CONFIG_USB_FOTG210_UDC))
+		fotg210_udc_remove(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_driver = {
+	.driver = {
+		.name   = "fotg210",
+		.of_match_table = of_match_ptr(fotg210_of_match),
+	},
+	.probe  = fotg210_probe,
+	.remove = fotg210_remove,
+};
+
+static int __init fotg210_init(void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	if (IS_ENABLED(CONFIG_USB_FOTG210_HCD))
+		fotg210_hcd_init();
+	return platform_driver_register(&fotg210_driver);
+}
+module_init(fotg210_init);
+
+static void __exit fotg210_cleanup(void)
+{
+	platform_driver_unregister(&fotg210_driver);
+	if (IS_ENABLED(CONFIG_USB_FOTG210_HCD))
+		fotg210_hcd_cleanup();
+}
+module_exit(fotg210_cleanup);
+
+MODULE_AUTHOR("Yuan-Hsin Chen, Feng-Hsin Chiang");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("FOTG210 Dual Role Controller Driver");