greybus: i2c-gb: split out into a stand-alone kernel module.

This splits the i2c-gb protocol into a stand-alone kernel module.

It's not going to stay in this fashion for long, this was done to test
the "can a protcol be loaded later" logic.  Future refactoring is going
to move the gpbridge protocols to a separate kernel module, where this
protocol is going to live.

But for now, split it out, it is good to test with, and shows a bug in
gbsim at the moment.
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/staging/greybus/Makefile

@@ -8,7 +8,6 @@ greybus-y :=	core.o		\
 		connection.o	\
 		protocol.o	\
 		operation.o	\
-		i2c-gb.o	\
 		gpio-gb.o	\
 		pwm-gb.o	\
 		sdio-gb.o	\
@@ -18,6 +17,7 @@ greybus-y :=	core.o		\
 		usb-gb.o
 
 obj-m += greybus.o
+obj-m += i2c-gb.o
 obj-m += es1-ap-usb.o
 
 KERNELVER		?= $(shell uname -r)

drivers/staging/greybus/i2c-gb.c

@@ -438,12 +438,6 @@ static struct gb_protocol i2c_protocol = {
 	.request_recv		= NULL,	/* no incoming requests */
 };
 
-int gb_i2c_protocol_init(void)
-{
-	return gb_protocol_register(&i2c_protocol);
-}
+gb_protocol_driver(&i2c_protocol);
 
-void gb_i2c_protocol_exit(void)
-{
-	gb_protocol_deregister(&i2c_protocol);
-}
+MODULE_LICENSE("GPL v2");

drivers/staging/greybus/protocol.c

@@ -184,10 +184,6 @@ bool gb_protocol_init(void)
 		pr_err("error initializing gpio protocol\n");
 		ret = false;
 	}
-	if (gb_i2c_protocol_init()) {
-		pr_err("error initializing i2c protocol\n");
-		ret = false;
-	}
 	if (gb_pwm_protocol_init()) {
 		pr_err("error initializing pwm protocol\n");
 		ret = false;
@@ -217,7 +213,6 @@ void gb_protocol_exit(void)
 	gb_vibrator_protocol_exit();
 	gb_sdio_protocol_exit();
 	gb_uart_protocol_exit();
-	gb_i2c_protocol_exit();
 	gb_gpio_protocol_exit();
 	gb_battery_protocol_exit();
 }

drivers/staging/greybus/protocol.h

@@ -53,9 +53,6 @@ extern void gb_battery_protocol_exit(void);
 extern int gb_gpio_protocol_init(void);
 extern void gb_gpio_protocol_exit(void);
 
-extern int gb_i2c_protocol_init(void);
-extern void gb_i2c_protocol_exit(void);
-
 extern int gb_pwm_protocol_init(void);
 extern void gb_pwm_protocol_exit(void);
 
@@ -74,4 +71,16 @@ extern void gb_usb_protocol_exit(void);
 bool gb_protocol_init(void);
 void gb_protocol_exit(void);
 
+#define gb_protocol_driver(__protocol)			\
+static int __init protocol_init(void)			\
+{							\
+	return gb_protocol_register(__protocol);	\
+}							\
+module_init(protocol_init);				\
+static void __exit protocol_exit(void)			\
+{							\
+	gb_protocol_deregister(__protocol);		\
+}							\
+module_exit(protocol_exit);
+
 #endif /* __PROTOCOL_H */