usb: gadget: start with libcomposite

This patch aims to be simple. It removes #include usbstribgs.c line from each
gadget and creates libcomposite.ko which has only one member, that is
usbstribgs.c.
Acked-by: NMichal Nazarewicz <mina86@mina86.com>
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/gadget/Kconfig

@@ -494,6 +494,12 @@ endmenu
 #
 # USB Gadget Drivers
 #
+
+# composite based drivers
+config USB_LIBCOMPOSITE
+	tristate
+	depends on USB_GADGET
+
 choice
 	tristate "USB Gadget Drivers"
 	default USB_ETH
@@ -517,6 +523,7 @@ choice
 
 config USB_ZERO
 	tristate "Gadget Zero (DEVELOPMENT)"
+	select USB_LIBCOMPOSITE
 	help
 	  Gadget Zero is a two-configuration device.  It either sinks and
 	  sources bulk data; or it loops back a configurable number of
@@ -552,6 +559,7 @@ config USB_ZERO_HNPTEST
 config USB_AUDIO
 	tristate "Audio Gadget (EXPERIMENTAL)"
 	depends on SND
+	select USB_LIBCOMPOSITE
 	select SND_PCM
 	help
 	  This Gadget Audio driver is compatible with USB Audio Class
@@ -580,6 +588,7 @@ config GADGET_UAC1
 config USB_ETH
 	tristate "Ethernet Gadget (with CDC Ethernet support)"
 	depends on NET
+	select USB_LIBCOMPOSITE
 	select CRC32
 	help
 	  This driver implements Ethernet style communication, in one of
@@ -615,6 +624,7 @@ config USB_ETH
 config USB_ETH_RNDIS
 	bool "RNDIS support"
 	depends on USB_ETH
+	select USB_LIBCOMPOSITE
 	default y
 	help
 	   Microsoft Windows XP bundles the "Remote NDIS" (RNDIS) protocol,
@@ -633,6 +643,7 @@ config USB_ETH_RNDIS
 config USB_ETH_EEM
        bool "Ethernet Emulation Model (EEM) support"
        depends on USB_ETH
+	select USB_LIBCOMPOSITE
        default n
        help
          CDC EEM is a newer USB standard that is somewhat simpler than CDC ECM
@@ -649,6 +660,7 @@ config USB_ETH_EEM
 config USB_G_NCM
 	tristate "Network Control Model (NCM) support"
 	depends on NET
+	select USB_LIBCOMPOSITE
 	select CRC32
 	help
 	  This driver implements USB CDC NCM subclass standard. NCM is
@@ -678,6 +690,7 @@ config USB_GADGETFS
 config USB_FUNCTIONFS
 	tristate "Function Filesystem (EXPERIMENTAL)"
 	depends on EXPERIMENTAL
+	select USB_LIBCOMPOSITE
 	select USB_FUNCTIONFS_GENERIC if !(USB_FUNCTIONFS_ETH || USB_FUNCTIONFS_RNDIS)
 	help
 	  The Function Filesystem (FunctionFS) lets one create USB
@@ -741,6 +754,7 @@ config USB_FILE_STORAGE_TEST
 config USB_MASS_STORAGE
 	tristate "Mass Storage Gadget"
 	depends on BLOCK
+	select USB_LIBCOMPOSITE
 	help
 	  The Mass Storage Gadget acts as a USB Mass Storage disk drive.
 	  As its storage repository it can use a regular file or a block
@@ -756,6 +770,7 @@ config USB_MASS_STORAGE
 config USB_GADGET_TARGET
 	tristate "USB Gadget Target Fabric Module"
 	depends on TARGET_CORE
+	select USB_LIBCOMPOSITE
 	help
 	  This fabric is an USB gadget. Two USB protocols are supported that is
 	  BBB or BOT (Bulk Only Transport) and UAS (USB Attached SCSI). BOT is
@@ -765,6 +780,7 @@ config USB_GADGET_TARGET
 
 config USB_G_SERIAL
 	tristate "Serial Gadget (with CDC ACM and CDC OBEX support)"
+	select USB_LIBCOMPOSITE
 	help
 	  The Serial Gadget talks to the Linux-USB generic serial driver.
 	  This driver supports a CDC-ACM module option, which can be used
@@ -785,6 +801,7 @@ config USB_G_SERIAL
 config USB_MIDI_GADGET
 	tristate "MIDI Gadget (EXPERIMENTAL)"
 	depends on SND && EXPERIMENTAL
+	select USB_LIBCOMPOSITE
 	select SND_RAWMIDI
 	help
 	  The MIDI Gadget acts as a USB Audio device, with one MIDI
@@ -798,6 +815,7 @@ config USB_MIDI_GADGET
 
 config USB_G_PRINTER
 	tristate "Printer Gadget"
+	select USB_LIBCOMPOSITE
 	help
 	  The Printer Gadget channels data between the USB host and a
 	  userspace program driving the print engine. The user space
@@ -814,6 +832,7 @@ config USB_G_PRINTER
 config USB_CDC_COMPOSITE
 	tristate "CDC Composite Device (Ethernet and ACM)"
 	depends on NET
+	select USB_LIBCOMPOSITE
 	help
 	  This driver provides two functions in one configuration:
 	  a CDC Ethernet (ECM) link, and a CDC ACM (serial port) link.
@@ -828,6 +847,7 @@ config USB_CDC_COMPOSITE
 config USB_G_NOKIA
 	tristate "Nokia composite gadget"
 	depends on PHONET
+	select USB_LIBCOMPOSITE
 	help
 	  The Nokia composite gadget provides support for acm, obex
 	  and phonet in only one composite gadget driver.
@@ -838,6 +858,7 @@ config USB_G_NOKIA
 config USB_G_ACM_MS
 	tristate "CDC Composite Device (ACM and mass storage)"
 	depends on BLOCK
+	select USB_LIBCOMPOSITE
 	help
 	  This driver provides two functions in one configuration:
 	  a mass storage, and a CDC ACM (serial port) link.
@@ -849,6 +870,7 @@ config USB_G_MULTI
 	tristate "Multifunction Composite Gadget (EXPERIMENTAL)"
 	depends on BLOCK && NET
 	select USB_G_MULTI_CDC if !USB_G_MULTI_RNDIS
+	select USB_LIBCOMPOSITE
 	help
 	  The Multifunction Composite Gadget provides Ethernet (RNDIS
 	  and/or CDC Ethernet), mass storage and ACM serial link
@@ -889,6 +911,7 @@ config USB_G_MULTI_CDC
 
 config USB_G_HID
 	tristate "HID Gadget"
+	select USB_LIBCOMPOSITE
 	help
 	  The HID gadget driver provides generic emulation of USB
 	  Human Interface Devices (HID).
@@ -899,8 +922,10 @@ config USB_G_HID
 	  Say "y" to link the driver statically, or "m" to build a
 	  dynamically linked module called "g_hid".
 
+# Standalone / single function gadgets
 config USB_G_DBGP
 	tristate "EHCI Debug Device Gadget"
+	select USB_LIBCOMPOSITE
 	help
 	  This gadget emulates an EHCI Debug device. This is useful when you want
 	  to interact with an EHCI Debug Port.

drivers/usb/gadget/Makefile

@@ -4,6 +4,8 @@
 ccflags-$(CONFIG_USB_GADGET_DEBUG) := -DDEBUG
 
 obj-$(CONFIG_USB_GADGET)	+= udc-core.o
+obj-$(CONFIG_USB_LIBCOMPOSITE)	+= libcomposite.o
+libcomposite-y			:= usbstring.o
 obj-$(CONFIG_USB_DUMMY_HCD)	+= dummy_hcd.o
 obj-$(CONFIG_USB_NET2272)	+= net2272.o
 obj-$(CONFIG_USB_NET2280)	+= net2280.o

drivers/usb/gadget/acm_ms.c

@@ -42,7 +42,6 @@
  */
 
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 #include "u_serial.c"

drivers/usb/gadget/audio.c

@@ -27,7 +27,6 @@
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/cdc2.c

@@ -44,7 +44,6 @@
  */
 
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 #include "u_serial.c"

drivers/usb/gadget/ether.c

@@ -103,7 +103,6 @@ static inline bool has_rndis(void)
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/file_storage.c

@@ -265,7 +265,6 @@
  * the runtime footprint, and giving us at least some parts of what
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/g_ffs.c

@@ -24,7 +24,6 @@
  */
 
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/gmidi.c

@@ -38,7 +38,6 @@
 #include "gadget_chips.h"
 
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 #include "f_midi.c"

drivers/usb/gadget/hid.c

@@ -35,7 +35,6 @@
  */
 
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/mass_storage.c

@@ -49,7 +49,6 @@
  */
 
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 #include "f_mass_storage.c"

drivers/usb/gadget/multi.c

@@ -44,7 +44,6 @@ MODULE_LICENSE("GPL");
  */
 
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/ncm.c

@@ -37,7 +37,6 @@
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/nokia.c

@@ -39,7 +39,6 @@
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/printer.c

@@ -52,7 +52,6 @@
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/serial.c

@@ -38,7 +38,6 @@
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/tcm_usb_gadget.c

@@ -25,7 +25,6 @@
 #include <target/configfs_macros.h>
 #include <asm/unaligned.h>
 
-#include "usbstring.c"
 #include "epautoconf.c"
 #include "config.c"
 #include "composite.c"

drivers/usb/gadget/usbstring.c

@@ -9,6 +9,7 @@
 
 #include <linux/errno.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/list.h>
 #include <linux/string.h>
 #include <linux/device.h>
@@ -68,4 +69,5 @@ usb_gadget_get_string (struct usb_gadget_strings *table, int id, u8 *buf)
 	buf [1] = USB_DT_STRING;
 	return buf [0];
 }
-
+EXPORT_SYMBOL_GPL(usb_gadget_get_string);
+MODULE_LICENSE("GPL");

drivers/usb/gadget/webcam.c

@@ -24,7 +24,6 @@
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"
 

drivers/usb/gadget/zero.c

@@ -59,7 +59,6 @@
  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  */
 #include "composite.c"
-#include "usbstring.c"
 #include "config.c"
 #include "epautoconf.c"