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450279822f
Add FunctionFS support. It allows certain USB functions to be provided from userspace, e.g. MTP, PTP, adb. The functions provided by the gadget itself are enumerated in /sys/class/ccg0/functions. The functions which can be supplied from userspace must be enumerated in /sys/class/ccg0/f_fs/user_functions. No other userspace functions can be used than specified in the above mentioned file, but just specifying them there is not enough to activate them. The userspace functions in order to be activated need also be enumerated in /sys/class/ccg0/functions. An example sequence of operations can be as follows: $ echo 0 > /sys/class/ccg_usb/ccg0/enable $ echo -n 0x2d01 > /sys/module/g_ccg/parameters/idProduct $ echo -n MyDevice > /sys/module/g_ccg/parameters/iSerialNumber $ echo -n 0x1d6b > /sys/module/g_ccg/parameters/idVendor $ echo -n Manufacturer > /sys/module/g_ccg/parameters/iManufacturer $ echo -n Product > /sys/module/g_ccg/parameters/iProduct $ echo -n bcdDevice > /sys/module/g_ccg/parameters/bcdDevice $ echo adb,mtp,ptp > /sys/class/ccg_usb/ccg0/f_fs/user_functions $ echo mass_storage,ptp > /sys/class/ccg_usb/ccg0/functions $ echo /file.img > /sys/class/ccg_usb/ccg0/f_mass_storage/lun/file $ mkdir -p /dev/usbgadget/ptp $ mount -t functionfs ptp /dev/usbgadget/ptp $ ./ptp & $ echo 1 > /sys/class/ccg_usb/ccg0/enable The above example declares that adb, mtp and ptp functions can be supplied from userspace through FunctionFS. But of them all only ptp is actually activated, together with mass_storage, the latter being implemented in the gadget itself (in kernel, not in userspace). The list of functions can be modified at runtime while the gadget is not enabled, that is, after $ echo 0 > /sys/class/ccg_usb/ccg0/enable The FunctionFS function is implicitly handled by the gadget, that is, if a userspace function name is provided in /sys/class/ccg_usb/ccg0/functions, then the FunctionFS function is activated. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
158 lines
4.4 KiB
Text
158 lines
4.4 KiB
Text
What: /sys/class/ccg_usb
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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The ccg_usb/ class subdirectory belongs to ccg
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USB gadget.
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What: /sys/class/ccg_usb/ccgX
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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The /sys/class/ccg_usb/ccg{0,1,2,3...} class
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subdirectories correspond to each ccg gadget device;
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at the time of this writing there is only ccg0 and it
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represents the ccg gadget.
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What: /sys/class/ccg_usb/ccgX/functions
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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A comma-separated list of USB function names to be activated
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in this ccg gadget. It includes both the functions provided
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in-kernel by the ccg gadget and the functions provided from
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userspace through FunctionFS.
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What: /sys/class/ccg_usb/ccgX/enable
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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A flag activating/deactivating the ccg usb gadget.
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What: /sys/class/ccg_usb/ccgX/state
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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Configurable usb gadget state:
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DISCONNECTED
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CONNECTED
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CONFIGURED
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What: /sys/class/ccg_usb/ccgX/f_acm/
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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The /sys/class/ccg_usb/ccgX/f_acm subdirectory
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corresponds to the gadget's USB CDC serial (ACM) function
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driver.
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What: /sys/class/ccg_usb/ccgX/f_acm/instances
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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Maximum number of the /dev/ttyGS<X> interface the driver uses.
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What: /sys/class/ccg_usb/ccgX/f_fs
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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The /sys/class/ccg_usb/ccgX/f_fs subdirectory
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corresponds to the gadget's FunctionFS driver.
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What: /sys/class/ccg_usb/ccgX/f_fs/user_functions
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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A comma-separeted list of USB function names to be supported
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from userspace. No other userspace FunctionFS functions can
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be supported than listed here. However, the actual activation
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of these functions is still done through
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/sys/class/ccg_usb/ccgX/functions, where it is possible
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to specify any subset (including maximum and empty) of
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/sys/class/ccg_usb/ccgX/f_fs/user_functions.
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What: /sys/class/ccg_usb/ccgX/f_fs/max_user_functions
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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Maximum number of USB functions to be supported from userspace.
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What: /sys/class/ccg_usb/ccgX/f_rndis
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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The /sys/class/ccg_usb/ccgX/f_rndis subdirectory
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corresponds to the gadget's RNDIS driver.
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What: /sys/class/ccg_usb/ccgX/f_rndis/manufacturer
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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RNDIS Ethernet port manufacturer string.
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What: /sys/class/ccg_usb/ccgX/f_rndis/wceis
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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RNDIS Ethernet port wireless flag.
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What: /sys/class/ccg_usb/ccgX/f_rndis/ethaddr
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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RNDIS Ethernet port Ethernet address.
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What: /sys/class/ccg_usb/ccgX/f_rndis/vendorID
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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RNDIS Ethernet port vendor ID.
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What: /sys/class/ccg_usb/ccgX/f_mass_storage
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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The /sys/class/ccg_usb/ccgX/f_mass_storage subdirectory
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corresponds to the gadget's USB mass storage driver.
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What: /sys/class/ccg_usb/ccgX/f_mass_storage/lun
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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The /sys/class/ccg_usb/ccgX/f_mass_storage/lun
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subdirectory corresponds to the gadget's USB mass storage
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driver and its underlying storage.
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What: /sys/class/ccg_usb/ccgX/f_mass_storage/lun
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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The /sys/class/ccg_usb/ccgX/f_mass_storage/lun
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subdirectory corresponds to the gadget's USB mass storage
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driver and its underlying storage.
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What: /sys/class/ccg_usb/ccgX/f_mass_storage/lun/file
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Date: May 2012
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KernelVersion: 3.4
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Contact: linux-usb@vger.kernel.org
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Description:
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Gadget's USB mass storage underlying file.
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