usb: gadget: allow multiple gadgets to be built

now that we have the udc class, we can allow
multiple gadget controller drivers to be
compiled as modules. This will allow for
distro-like kernels for embedded devices.

With this patch, I managed to build an x86
kernel with support for many of the controllers
enabled:

CONFIG_USB_FUSB300=m
CONFIG_USB_R8A66597=m
CONFIG_USB_M66592=m
CONFIG_USB_AMD5536UDC=m
CONFIG_USB_CI13XXX_PCI=m
CONFIG_USB_NET2272=m
CONFIG_USB_NET2280=m
CONFIG_USB_GOKU=m
CONFIG_USB_LANGWELL=m
CONFIG_USB_EG20T=m

Also an ARM kernel with support for many controllers:

CONFIG_USB_FUSB300=m
CONFIG_USB_OMAP=m
CONFIG_USB_R8A66597=m
CONFIG_USB_GADGET_MUSB_HDRC=m
CONFIG_USB_M66592=m
CONFIG_USB_NET2272=m
CONFIG_USB_DUMMY_HCD=m

The next step would be to get rid of the
direct access to arch/ and mach/ directories
on some gadget controllers so that we can
build all of them without depending on their
respective ARCH_* symbols.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/Kconfig

@@ -118,8 +118,6 @@ source "drivers/usb/host/Kconfig"
 
 source "drivers/usb/musb/Kconfig"
 
-source "drivers/usb/renesas_usbhs/Kconfig"
-
 source "drivers/usb/class/Kconfig"
 
 source "drivers/usb/storage/Kconfig"

drivers/usb/gadget/Kconfig

@@ -96,9 +96,6 @@ config USB_GADGET_VBUS_DRAW
 	   This value will be used except for system-specific gadget
 	   drivers that have more specific information.
 
-config	USB_GADGET_SELECTED
-	boolean
-
 #
 # USB Peripheral Controller Support
 #
@@ -122,10 +119,9 @@ choice
 # Integrated controllers
 #
 
-config USB_GADGET_AT91
-	boolean "Atmel AT91 USB Device Port"
+config USB_AT91
+	tristate "Atmel AT91 USB Device Port"
 	depends on ARCH_AT91 && !ARCH_AT91SAM9RL && !ARCH_AT91CAP9 && !ARCH_AT91SAM9G45
-	select USB_GADGET_SELECTED
 	help
 	   Many Atmel AT91 processors (such as the AT91RM2000) have a
 	   full speed USB Device Port with support for five configurable
@@ -135,27 +131,16 @@ config USB_GADGET_AT91
 	   dynamically linked module called "at91_udc" and force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_AT91
-	tristate
-	depends on USB_GADGET_AT91
-	default USB_GADGET
-
-config USB_GADGET_ATMEL_USBA
-	boolean "Atmel USBA"
+config USB_ATMEL_USBA
+	tristate "Atmel USBA"
 	select USB_GADGET_DUALSPEED
 	depends on AVR32 || ARCH_AT91CAP9 || ARCH_AT91SAM9RL || ARCH_AT91SAM9G45
 	help
 	  USBA is the integrated high-speed USB Device controller on
 	  the AT32AP700x, some AT91SAM9 and AT91CAP9 processors from Atmel.
 
-config USB_ATMEL_USBA
-	tristate
-	depends on USB_GADGET_ATMEL_USBA
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_FSL_USB2
-	boolean "Freescale Highspeed USB DR Peripheral Controller"
+config USB_FSL_USB2
+	tristate "Freescale Highspeed USB DR Peripheral Controller"
 	depends on FSL_SOC || ARCH_MXC
 	select USB_GADGET_DUALSPEED
 	select USB_FSL_MPH_DR_OF if OF
@@ -170,26 +155,14 @@ config USB_GADGET_FSL_USB2
 	   dynamically linked module called "fsl_usb2_udc" and force
 	   all gadget drivers to also be dynamically linked.
 
-config USB_FSL_USB2
-	tristate
-	depends on USB_GADGET_FSL_USB2
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_FUSB300
-	boolean "Faraday FUSB300 USB Peripheral Controller"
+config USB_FUSB300
+	tristate "Faraday FUSB300 USB Peripheral Controller"
 	select USB_GADGET_DUALSPEED
 	help
 	   Faraday usb device controller FUSB300 driver
 
-config USB_FUSB300
-	tristate
-	depends on USB_GADGET_FUSB300
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_OMAP
-	boolean "OMAP USB Device Controller"
+config USB_OMAP
+	tristate "OMAP USB Device Controller"
 	depends on ARCH_OMAP
 	select ISP1301_OMAP if MACH_OMAP_H2 || MACH_OMAP_H3 || MACH_OMAP_H4_OTG
 	select USB_OTG_UTILS if ARCH_OMAP
@@ -204,14 +177,8 @@ config USB_GADGET_OMAP
 	   dynamically linked module called "omap_udc" and force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_OMAP
-	tristate
-	depends on USB_GADGET_OMAP
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_PXA25X
-	boolean "PXA 25x or IXP 4xx"
+config USB_PXA25X
+	tristate "PXA 25x or IXP 4xx"
 	depends on (ARCH_PXA && PXA25x) || ARCH_IXP4XX
 	select USB_OTG_UTILS
 	help
@@ -226,24 +193,18 @@ config USB_GADGET_PXA25X
 	   dynamically linked module called "pxa25x_udc" and force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_PXA25X
-	tristate
-	depends on USB_GADGET_PXA25X
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
 # if there's only one gadget driver, using only two bulk endpoints,
 # don't waste memory for the other endpoints
 config USB_PXA25X_SMALL
-	depends on USB_GADGET_PXA25X
+	depends on USB_PXA25X
 	bool
 	default n if USB_ETH_RNDIS
 	default y if USB_ZERO
 	default y if USB_ETH
 	default y if USB_G_SERIAL
 
-config USB_GADGET_R8A66597
-	boolean "Renesas R8A66597 USB Peripheral Controller"
+config USB_R8A66597
+	tristate "Renesas R8A66597 USB Peripheral Controller"
 	select USB_GADGET_DUALSPEED
 	help
 	   R8A66597 is a discrete USB host and peripheral controller chip that
@@ -254,32 +215,20 @@ config USB_GADGET_R8A66597
 	   dynamically linked module called "r8a66597_udc" and force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_R8A66597
-	tristate
-	depends on USB_GADGET_R8A66597
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_RENESAS_USBHS
-	boolean "Renesas USBHS"
-	depends on USB_RENESAS_USBHS
-	select USB_GADGET_DUALSPEED
+config USB_RENESAS_USBHS
+	tristate 'Renesas USBHS controller'
+	depends on SUPERH || ARCH_SHMOBILE
 	help
-	   Renesas USBHS is a discrete USB host and peripheral controller
-	   chip that supports both full and high speed USB 2.0 data transfers.
-	   platform is able to configure endpoint (pipe) style
-
-	   Say "y" to enable the gadget specific portion of the USBHS driver.
-
+	   Renesas USBHS is a discrete USB host and peripheral controller chip
+	   that supports both full and high speed USB 2.0 data transfers.
+	   It has nine or more configurable endpoints, and endpoint zero.
 
-config USB_RENESAS_USBHS_UDC
-	tristate
-	depends on USB_GADGET_RENESAS_USBHS
-	default USB_GADGET
-	select USB_GADGET_SELECTED
+	   Say "y" to link the driver statically, or "m" to build a
+	   dynamically linked module called "renesas_usbhs" and force all
+	   gadget drivers to also be dynamically linked.
 
-config USB_GADGET_PXA27X
-	boolean "PXA 27x"
+config USB_PXA27X
+	tristate "PXA 27x"
 	depends on ARCH_PXA && (PXA27x || PXA3xx)
 	select USB_OTG_UTILS
 	help
@@ -293,14 +242,8 @@ config USB_GADGET_PXA27X
 	   dynamically linked module called "pxa27x_udc" and force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_PXA27X
-	tristate
-	depends on USB_GADGET_PXA27X
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_S3C_HSOTG
-	boolean "S3C HS/OtG USB Device controller"
+config USB_S3C_HSOTG
+	tristate "S3C HS/OtG USB Device controller"
 	depends on S3C_DEV_USB_HSOTG
 	select USB_GADGET_S3C_HSOTG_PIO
 	select USB_GADGET_DUALSPEED
@@ -308,14 +251,8 @@ config USB_GADGET_S3C_HSOTG
 	  The Samsung S3C64XX USB2.0 high-speed gadget controller
 	  integrated into the S3C64XX series SoC.
 
-config USB_S3C_HSOTG
-	tristate
-	depends on USB_GADGET_S3C_HSOTG
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_IMX
-	boolean "Freescale IMX USB Peripheral Controller"
+config USB_IMX
+	tristate "Freescale IMX USB Peripheral Controller"
 	depends on ARCH_MX1
 	help
 	   Freescale's IMX series include an integrated full speed
@@ -329,14 +266,8 @@ config USB_GADGET_IMX
 	   dynamically linked module called "imx_udc" and force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_IMX
-	tristate
-	depends on USB_GADGET_IMX
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_S3C2410
-	boolean "S3C2410 USB Device Controller"
+config USB_S3C2410
+	tristate "S3C2410 USB Device Controller"
 	depends on ARCH_S3C2410
 	help
 	  Samsung's S3C2410 is an ARM-4 processor with an integrated
@@ -346,18 +277,12 @@ config USB_GADGET_S3C2410
 	  This driver has been tested on the S3C2410, S3C2412, and
 	  S3C2440 processors.
 
-config USB_S3C2410
-	tristate
-	depends on USB_GADGET_S3C2410
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
 config USB_S3C2410_DEBUG
 	boolean "S3C2410 udc debug messages"
-	depends on USB_GADGET_S3C2410
+	depends on USB_S3C2410
 
-config USB_GADGET_S3C_HSUDC
-	boolean "S3C2416, S3C2443 and S3C2450 USB Device Controller"
+config USB_S3C_HSUDC
+	tristate "S3C2416, S3C2443 and S3C2450 USB Device Controller"
 	depends on ARCH_S3C2410
 	select USB_GADGET_DUALSPEED
 	help
@@ -367,41 +292,29 @@ config USB_GADGET_S3C_HSUDC
 
 	  This driver has been tested on S3C2416 and S3C2450 processors.
 
-config USB_S3C_HSUDC
-	tristate
-	depends on USB_GADGET_S3C_HSUDC
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_PXA_U2O
-	boolean "PXA9xx Processor USB2.0 controller"
+config USB_PXA_U2O
+	tristate "PXA9xx Processor USB2.0 controller"
+	depends on ARCH_MMP
 	select USB_GADGET_DUALSPEED
 	help
 	  PXA9xx Processor series include a high speed USB2.0 device
 	  controller, which support high speed and full speed USB peripheral.
 
-config USB_PXA_U2O
-	tristate
-	depends on USB_GADGET_PXA_U2O
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
 #
 # Controllers available in both integrated and discrete versions
 #
 
 # musb builds in ../musb along with host support
 config USB_GADGET_MUSB_HDRC
-	boolean "Inventra HDRC USB Peripheral (TI, ADI, ...)"
+	tristate "Inventra HDRC USB Peripheral (TI, ADI, ...)"
 	depends on USB_MUSB_HDRC && (USB_MUSB_PERIPHERAL || USB_MUSB_OTG)
 	select USB_GADGET_DUALSPEED
-	select USB_GADGET_SELECTED
 	help
 	  This OTG-capable silicon IP is used in dual designs including
 	  the TI DaVinci, OMAP 243x, OMAP 343x, TUSB 6010, and ADI Blackfin
 
-config USB_GADGET_M66592
-	boolean "Renesas M66592 USB Peripheral Controller"
+config USB_M66592
+	tristate "Renesas M66592 USB Peripheral Controller"
 	select USB_GADGET_DUALSPEED
 	help
 	   M66592 is a discrete USB peripheral controller chip that
@@ -412,18 +325,12 @@ config USB_GADGET_M66592
 	   dynamically linked module called "m66592_udc" and force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_M66592
-	tristate
-	depends on USB_GADGET_M66592
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
 #
 # Controllers available only in discrete form (and all PCI controllers)
 #
 
-config USB_GADGET_AMD5536UDC
-	boolean "AMD5536 UDC"
+config USB_AMD5536UDC
+	tristate "AMD5536 UDC"
 	depends on PCI
 	select USB_GADGET_DUALSPEED
 	help
@@ -437,14 +344,8 @@ config USB_GADGET_AMD5536UDC
 	   dynamically linked module called "amd5536udc" and force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_AMD5536UDC
-	tristate
-	depends on USB_GADGET_AMD5536UDC
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_FSL_QE
-	boolean "Freescale QE/CPM USB Device Controller"
+config USB_FSL_QE
+	tristate "Freescale QE/CPM USB Device Controller"
 	depends on FSL_SOC && (QUICC_ENGINE || CPM)
 	help
 	   Some of Freescale PowerPC processors have a Full Speed
@@ -456,14 +357,8 @@ config USB_GADGET_FSL_QE
 	   Set CONFIG_USB_GADGET to "m" to build this driver as a
 	   dynamically linked module called "fsl_qe_udc".
 
-config USB_FSL_QE
-	tristate
-	depends on USB_GADGET_FSL_QE
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_CI13XXX_PCI
-	boolean "MIPS USB CI13xxx PCI UDC"
+config USB_CI13XXX_PCI
+	tristate "MIPS USB CI13xxx PCI UDC"
 	depends on PCI
 	select USB_GADGET_DUALSPEED
 	help
@@ -474,14 +369,8 @@ config USB_GADGET_CI13XXX_PCI
 	  dynamically linked module called "ci13xxx_udc" and force all
 	  gadget drivers to also be dynamically linked.
 
-config USB_CI13XXX_PCI
-	tristate
-	depends on USB_GADGET_CI13XXX_PCI
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_NET2272
-	boolean "PLX NET2272"
+config USB_NET2272
+	tristate "PLX NET2272"
 	select USB_GADGET_DUALSPEED
 	help
 	  PLX NET2272 is a USB peripheral controller which supports
@@ -493,9 +382,9 @@ config USB_GADGET_NET2272
 	  dynamically linked module called "net2272" and force all
 	  gadget drivers to also be dynamically linked.
 
-config USB_GADGET_NET2272_DMA
+config USB_NET2272_DMA
 	boolean "Support external DMA controller"
-	depends on USB_GADGET_NET2272
+	depends on USB_NET2272
 	help
 	  The NET2272 part can optionally support an external DMA
 	  controller, but your board has to have support in the
@@ -503,14 +392,8 @@ config USB_GADGET_NET2272_DMA
 
 	  If unsure, say "N" here.  The driver works fine in PIO mode.
 
-config USB_NET2272
-	tristate
-	depends on USB_GADGET_NET2272
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_NET2280
-	boolean "NetChip 228x"
+config USB_NET2280
+	tristate "NetChip 228x"
 	depends on PCI
 	select USB_GADGET_DUALSPEED
 	help
@@ -525,14 +408,8 @@ config USB_GADGET_NET2280
 	   dynamically linked module called "net2280" and force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_NET2280
-	tristate
-	depends on USB_GADGET_NET2280
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_GOKU
-	boolean "Toshiba TC86C001 'Goku-S'"
+config USB_GOKU
+	tristate "Toshiba TC86C001 'Goku-S'"
 	depends on PCI
 	help
 	   The Toshiba TC86C001 is a PCI device which includes controllers
@@ -545,14 +422,8 @@ config USB_GADGET_GOKU
 	   dynamically linked module called "goku_udc" and to force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_GOKU
-	tristate
-	depends on USB_GADGET_GOKU
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_LANGWELL
-	boolean "Intel Langwell USB Device Controller"
+config USB_LANGWELL
+	tristate "Intel Langwell USB Device Controller"
 	depends on PCI
 	select USB_GADGET_DUALSPEED
 	help
@@ -566,14 +437,8 @@ config USB_GADGET_LANGWELL
 	   dynamically linked module called "langwell_udc" and force all
 	   gadget drivers to also be dynamically linked.
 
-config USB_LANGWELL
-	tristate
-	depends on USB_GADGET_LANGWELL
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_EG20T
-	boolean "Intel EG20T PCH/OKI SEMICONDUCTOR ML7213 IOH UDC"
+config USB_EG20T
+	tristate "Intel EG20T PCH/OKI SEMICONDUCTOR ML7213 IOH UDC"
 	depends on PCI
 	select USB_GADGET_DUALSPEED
 	help
@@ -594,14 +459,8 @@ config USB_GADGET_EG20T
 	  ML7213 is companion chip for Intel Atom E6xx series.
 	  ML7213 is completely compatible for Intel EG20T PCH.
 
-config USB_EG20T
-	tristate
-	depends on USB_GADGET_EG20T
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
-config USB_GADGET_CI13XXX_MSM
-	boolean "MIPS USB CI13xxx for MSM"
+config USB_CI13XXX_MSM
+	tristate "MIPS USB CI13xxx for MSM"
 	depends on ARCH_MSM
 	select USB_GADGET_DUALSPEED
 	select USB_MSM_OTG
@@ -617,18 +476,12 @@ config USB_GADGET_CI13XXX_MSM
 	  dynamically linked module called "ci13xxx_msm" and force all
 	  gadget drivers to also be dynamically linked.
 
-config USB_CI13XXX_MSM
-	tristate
-	depends on USB_GADGET_CI13XXX_MSM
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
 #
 # LAST -- dummy/emulated controller
 #
 
-config USB_GADGET_DUMMY_HCD
-	boolean "Dummy HCD (DEVELOPMENT)"
+config USB_DUMMY_HCD
+	tristate "Dummy HCD (DEVELOPMENT)"
 	depends on USB=y || (USB=m && USB_GADGET=m)
 	select USB_GADGET_DUALSPEED
 	select USB_GADGET_SUPERSPEED
@@ -638,11 +491,11 @@ config USB_GADGET_DUMMY_HCD
 	  side is the master; the gadget side is the slave.  Gadget drivers
 	  can be high, full, or low speed; and they have access to endpoints
 	  like those from NET2280, PXA2xx, or SA1100 hardware.
-	  
+
 	  This may help in some stages of creating a driver to embed in a
 	  Linux device, since it lets you debug several parts of the gadget
 	  driver without its hardware or drivers being involved.
-	  
+
 	  Since such a gadget side driver needs to interoperate with a host
 	  side Linux-USB device driver, this may help to debug both sides
 	  of a USB protocol stack.
@@ -651,12 +504,6 @@ config USB_GADGET_DUMMY_HCD
 	  dynamically linked module called "dummy_hcd" and force all
 	  gadget drivers to also be dynamically linked.
 
-config USB_DUMMY_HCD
-	tristate
-	depends on USB_GADGET_DUMMY_HCD
-	default USB_GADGET
-	select USB_GADGET_SELECTED
-
 # NOTE:  Please keep dummy_hcd LAST so that "real hardware" appears
 # first and will be selected by default.
 
@@ -678,7 +525,7 @@ config USB_GADGET_SUPERSPEED
 #
 choice
 	tristate "USB Gadget Drivers"
-	depends on USB_GADGET && USB_GADGET_SELECTED
+	depends on USB_GADGET
 	default USB_ETH
 	help
 	  A Linux "Gadget Driver" talks to the USB Peripheral Controller

drivers/usb/renesas_usbhs/Kconfig

-#
-# Renesas USB Controller Drivers
-#
-
-config USB_RENESAS_USBHS
-	tristate 'Renesas USBHS controller'
-	depends on SUPERH || ARCH_SHMOBILE
-	default n
-	help
-	   Renesas USBHS is a discrete USB host and peripheral controller chip
-	   that supports both full and high speed USB 2.0 data transfers.
-	   It has nine or more configurable endpoints, and endpoint zero.
-
-	   Say "y" to link the driver statically, or "m" to build a
-	   dynamically linked module called "renesas_usbhs" and force all
-	   gadget drivers to also be dynamically linked.