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>

1 files changed, 66 insertions, 219 deletions

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 86f64caeafc..46a253adde3 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/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