USB: EHCI Debug Port Device Gadget

This is a patch that implements an USB EHCI Debug Device using the
Gadget API. This patch applies to a 2.6.35-rc3 kernel.

The gadget needs a compliant usb controller that forwards the
USB_DEVICE_DEBUG_MODE feature to its gadget.

The gadget provides two configuration modes, one that only printk() the
received data, and one that exposes a serial device to userland
(/dev/ttyGSxxx).

The gadget has been tested on an IGEPv2 board running a 2.6.35-rc1
kernel. The debug port was fed on the host side by a 2.6.34 kernel.

Signed-off-by: Stephane Duverger <stephane.duverger@gmail.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index dd3b25101858..cd27f9bde2c8 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -915,6 +915,34 @@ config USB_G_HID
           Say "y" to link the driver statically, or "m" to build a
           dynamically linked module called "g_hid".
 
+config USB_G_DBGP
+        tristate "EHCI Debug Device Gadget"
+        help
+          This gadget emulates an EHCI Debug device. This is useful when you want
+          to interact with an EHCI Debug Port.
+
+          Say "y" to link the driver statically, or "m" to build a
+          dynamically linked module called "g_dbgp".
+
+if USB_G_DBGP
+choice
+        prompt "EHCI Debug Device mode"
+        default USB_G_DBGP_SERIAL
+
+config USB_G_DBGP_PRINTK
+        depends on USB_G_DBGP
+        bool "printk"
+        help
+          Directly printk() received data. No interaction.
+
+config USB_G_DBGP_SERIAL
+        depends on USB_G_DBGP
+        bool "serial"
+        help
+          Userland can interact using /dev/ttyGSxxx.
+endchoice
+endif
+
 # put drivers that need isochronous transfer support (for audio
 # or video class gadget drivers), or specific hardware, here.
 config USB_G_WEBCAM