greybus: gpio: Create separate module

Create separate module for gpio gpbridge driver.

Tested on EVT 1.5 by inserting GP test module, all the devices were
enumerated correctly.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/Makefile

@@ -18,7 +18,6 @@ gb-phy-y :=	gpbridge.o	\
 		sdio.o	\
 		uart.o	\
 		pwm.o	\
-		gpio.o	\
 		i2c.o	\
 		spi.o	\
 		usb.o
@@ -40,6 +39,7 @@ gb-audio-manager-y += audio_manager.o
 gb-audio-manager-y += audio_manager_module.o
 gb-camera-y := camera.o
 gb-firmware-y := fw-core.o fw-download.o
+gb-gpio-y := gpio.o
 
 obj-m += greybus.o
 obj-m += gb-phy.o
@@ -62,6 +62,7 @@ obj-m += gb-audio-gb.o
 obj-m += gb-audio-apbridgea.o
 obj-m += gb-audio-manager.o
 obj-m += gb-firmware.o
+obj-m += gb-gpio.o
 
 KERNELVER		?= $(shell uname -r)
 KERNELDIR 		?= /lib/modules/$(KERNELVER)/build

drivers/staging/greybus/gpbridge.c

@@ -317,10 +317,6 @@ static int __init gpbridge_init(void)
 		goto error_gpbridge;
 	}
 
-	if (gb_gpio_driver_init()) {
-		pr_err("error initializing gpio driver\n");
-		goto error_gpio;
-	}
 	if (gb_pwm_driver_init()) {
 		pr_err("error initializing pwm driver\n");
 		goto error_pwm;
@@ -359,8 +355,6 @@ static int __init gpbridge_init(void)
 error_uart:
 	gb_pwm_driver_exit();
 error_pwm:
-	gb_gpio_driver_exit();
-error_gpio:
 	greybus_deregister(&gb_gpbridge_driver);
 error_gpbridge:
 	bus_unregister(&gpbridge_bus_type);
@@ -377,7 +371,6 @@ static void __exit gpbridge_exit(void)
 	gb_sdio_driver_exit();
 	gb_uart_driver_exit();
 	gb_pwm_driver_exit();
-	gb_gpio_driver_exit();
 
 	greybus_deregister(&gb_gpbridge_driver);
 	bus_unregister(&gpbridge_bus_type);

drivers/staging/greybus/gpbridge.h

@@ -66,9 +66,6 @@ void gb_##__driver##_exit(void)				\
 	gb_gpbridge_deregister(&__driver);			\
 }
 
-extern int gb_gpio_driver_init(void);
-extern void gb_gpio_driver_exit(void);
-
 extern int gb_pwm_driver_init(void);
 extern void gb_pwm_driver_exit(void);
 

drivers/staging/greybus/gpio.c

@@ -747,6 +747,7 @@ static const struct gpbridge_device_id gb_gpio_id_table[] = {
 	{ GPBRIDGE_PROTOCOL(GREYBUS_PROTOCOL_GPIO) },
 	{ },
 };
+MODULE_DEVICE_TABLE(gpbridge, gb_gpio_id_table);
 
 static struct gpbridge_driver gpio_driver = {
 	.name		= "gpio",
@@ -754,4 +755,6 @@ static struct gpbridge_driver gpio_driver = {
 	.remove		= gb_gpio_remove,
 	.id_table	= gb_gpio_id_table,
 };
-gb_gpbridge_builtin_driver(gpio_driver);
+
+module_gpbridge_driver(gpio_driver);
+MODULE_LICENSE("GPL v2");