greybus: pwm: Create separate module

Create separate module for pwm 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

@@ -17,7 +17,6 @@ greybus-y :=	core.o		\
 gb-phy-y :=	gpbridge.o	\
 		sdio.o	\
 		uart.o	\
-		pwm.o	\
 		spi.o	\
 		usb.o
 
@@ -38,6 +37,7 @@ 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-pwm-y := pwm.o
 gb-gpio-y := gpio.o
 gb-i2c-y := i2c.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-pwm.o
 obj-m += gb-gpio.o
 obj-m += gb-i2c.o
 

drivers/staging/greybus/gpbridge.c

@@ -317,10 +317,6 @@ static int __init gpbridge_init(void)
 		goto error_gpbridge;
 	}
 
-	if (gb_pwm_driver_init()) {
-		pr_err("error initializing pwm driver\n");
-		goto error_pwm;
-	}
 	if (gb_uart_driver_init()) {
 		pr_err("error initializing uart driver\n");
 		goto error_uart;
@@ -347,8 +343,6 @@ static int __init gpbridge_init(void)
 error_sdio:
 	gb_uart_driver_exit();
 error_uart:
-	gb_pwm_driver_exit();
-error_pwm:
 	greybus_deregister(&gb_gpbridge_driver);
 error_gpbridge:
 	bus_unregister(&gpbridge_bus_type);
@@ -363,7 +357,6 @@ static void __exit gpbridge_exit(void)
 	gb_usb_driver_exit();
 	gb_sdio_driver_exit();
 	gb_uart_driver_exit();
-	gb_pwm_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_pwm_driver_init(void);
-extern void gb_pwm_driver_exit(void);
-
 extern int gb_uart_driver_init(void);
 extern void gb_uart_driver_exit(void);
 

drivers/staging/greybus/pwm.c

@@ -256,6 +256,7 @@ static const struct gpbridge_device_id gb_pwm_id_table[] = {
 	{ GPBRIDGE_PROTOCOL(GREYBUS_PROTOCOL_PWM) },
 	{ },
 };
+MODULE_DEVICE_TABLE(gpbridge, gb_pwm_id_table);
 
 static struct gpbridge_driver pwm_driver = {
 	.name		= "pwm",
@@ -263,4 +264,6 @@ static struct gpbridge_driver pwm_driver = {
 	.remove		= gb_pwm_remove,
 	.id_table	= gb_pwm_id_table,
 };
-gb_gpbridge_builtin_driver(pwm_driver);
+
+module_gpbridge_driver(pwm_driver);
+MODULE_LICENSE("GPL v2");