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path: root/drivers/usb/gadget/multi.c
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2013-12-21USB: gadget: fix up some comments about CONFIG_USB_DEBUGGreg Kroah-Hartman
These two gadget drivers said that their #endif was for CONFIG_USB_DEBUG, but they really were not, so fix them up to be correct. Cc: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-10usb: gadget: multi: convert to new interface of f_mass_storageAndrzej Pietrasiewicz
Convert the legacy multi gadget to the new interface of f_mass_storage, so that later the compatibility layer in f_mass_storage can be removed. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-10-10usb: gadget: multi: convert to new interface of f_rndisAndrzej Pietrasiewicz
Convert the legacy multi gadget to the new interface of f_rndis, so that later the compatibility layer in f_rndis can be removed. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-10-10usb: gadget: multi: convert to new interface of f_ecmAndrzej Pietrasiewicz
Convert the legacy multi gadget to the new interface of f_ecm, so that later the compatibility layer in f_ecm can be removed. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-10-10usb: gadget: f_mass_storage: convert to new function interface with backward ↵Andrzej Pietrasiewicz
compatibility Converting mass storage to the new function interface requires converting the USB mass storage's function code and its users. This patch converts the f_mass_storage.c to the new function interface. The file is now compiled into a separate usb_f_mass_storage.ko module. The old function interface is provided by means of a preprocessor conditional directives. After all users are converted, the old interface can be removed. 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: Felipe Balbi <balbi@ti.com>
2013-10-01usb: gadget: create a utility module for mass_storageAndrzej Pietrasiewicz
Converting to configfs requires making the f_mass_storage.c a module. But first we need to get rid of "#include "storage_common.c". This patch makes storage_common.c a separately compiled file, which is built as a utility module named u_ms.ko. After all mass storage users are converted to the new function interface this module can be eliminated by merging it with the mass storage function's module. USB descriptors are exported so that they can be accessed from f_mass_storage. FSG_VENDOR_ID and FSG_PRODUCT_ID are moved to their only user. Handling of CONFIG_USB_GADGET_DEBUG_FILES is moved to f_mass_storage.c. The fsg_num_buffers static is moved to FSG_MODULE_PARAMETER users, so instead of using a global variable the f_mass_storage introduces fsg_num_buffers member in fsg_common (and fsg_config). fsg_strings and fsg_stringtab are moved to f_mass_storage.c. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-09-17usb: gadget: add '__ref' for rndis_config_register() and cdc_config_register()Chen Gang
They are only called by '__ref' function multi_bind(), and they will call '__init' functions, so recommend to let them '__ref' too. The related warnings: WARNING: drivers/usb/gadget/g_multi.o(.text+0xded6): Section mismatch in reference from the variable .LM2921 to the variable .init.text:_rndis_do_config The function .LM2921() references the variable __init _rndis_do_config. This is often because .LM2921 lacks a __init annotation or the annotation of _rndis_do_config is wrong. WARNING: drivers/usb/gadget/g_multi.o(.text+0xdf16): Section mismatch in reference from the variable .LM2953 to the variable .init.text:_cdc_do_config The function .LM2953() references the variable __init _cdc_do_config. This is often because .LM2953 lacks a __init annotation or the annotation of _cdc_do_config is wrong. Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-07-29usb: gadget: multi: fix error return code in cdc_do_config()Andrzej Pietrasiewicz
Fix to return a negative error code from the error handling case instead of 0, as returned elsewhere in this function. Introduced by commit 59835a (usb: gadget: multi: use function framework for ACM.) Make rndis_do_config() consistent with cdc_do_config() in the way it handles returning the PTR_ERR(f_acm_*). 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: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: f_rndis: convert to new function interface with backward ↵Andrzej Pietrasiewicz
compatibility Converting rndis to the new function interface requires converting the USB rndis' function code and its users. This patch converts the f_rndis.c to the new function interface. The file is now compiled into a separate usb_f_rndis.ko module. The old function interface is provided by means of a preprocessor conditional directives. After all users are converted, the old interface can be removed. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: multi: Remove unused includeAndrzej Pietrasiewicz
cleanup only, no functional changes. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: f_ecm: convert to new function interface with backward ↵Andrzej Pietrasiewicz
compatibility Converting ecm to the new function interface requires converting the USB ecm's function code and its users. This patch converts the f_ecm.c to the new function interface. The file is now compiled into a separate usb_f_ecm.ko module. The old function interface is provided by means of a preprocessor conditional directives. After all users are converted, the old interface can be removed. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: rndis: convert into moduleAndrzej Pietrasiewicz
In order to convert to configfs the usb functions need to be converted to a new interface and compiled as modules. This patch creates an rndis module which will be used by the new functions. After all users of f_rndis are converted to the new interface, this module can be merged with f_rndis module. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-06-10usb: gadget: u_ether: convert into moduleAndrzej Pietrasiewicz
u_ether.c has been #include'd by all gadgets which implement USB Ethernet functions. In order to add configfs support, the f_ecm.c, f_eem.c, f_ncm.c, f_subset.c, f_rndis.c need to be converted into modules and must not be #include'd. Consequently, the u_ether.c needs to be a module too, in a manner similar to u_serial.c. The resulting module should not take any parameters, so they are pushed to the current users of it, that is ether.c, g_ffs.c, multi.c, ncm.c, nokia.c. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-04-23usb: gadget: multi: fix error return code in rndis_do_config()Wei Yongjun
Fix to return a negative error code from the error handling case instead of 0, as returned elsewhere in this function. Introduced by commit 59835a (usb: gadget: multi: use function framework for ACM.) Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-04-03usb: gadget: push tty port allocation from gadget into f_acmSebastian Andrzej Siewior
It possible to allocate the tty port number within the "instance" structure of the function and there is no need to expose this information within the gadget and therefore it is removed here. This patch converts only f_acm and all its users. The other gadgets will follow once the function is converted to the function interface. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-04-03usb: gadget: move the global the_dev variable to their usersSebastian Andrzej Siewior
the u_ether.c file has a global variable named the_dev which keeps a pointer to the network device after it has been created via gether_setup_name(). It is only used internally by u_ether. This patches moves the variable to its users and passes it via the port.ioport where it is saved later anyway. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-01-21usb: gadget: multi: use function framework for ACMSebastian Andrzej Siewior
This patch converts the acm_ms gadget to make use of the function framework to request the ACM function. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-01-21usb: gadget: f_acm: convert to new function interface with backwards ↵Sebastian Andrzej Siewior
compatibility This patch converts f_acm into a module which uses the new function interface. It also converts one of its users that is g_serial to make use of it. The other users of it (g_nokia for instance) are still using the old include file system and should not notice the change at all. So they can be converter later independently. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-01-21usb: gadget: allocate & giveback serial ports instead hard code themSebastian Andrzej Siewior
This patch removes gserial_setup() and gserial_cleanup() and adds gserial_alloc_line() and gserial_free_line() to replace them. The initial setup of u_serial happens now on module load time. A maximum of four TTY ports can be requested which is the current limit. In theory we could extend this limit, the hard limit is the number of available endpoints. alloc_tty_driver() is now called at module init time with the max available ports. The per-line footprint here is on 32bit is 3 * size of pointer + 60 bytes (for cdevs). The remaining memory (struct gs_port) is allocated once a port is requested. With this change it is possible to load g_multi and g_serial at the same time. GS0 receives the module that is loaded first, GS1 is received by the next module and so on. With the configfs interface the port number can be exported and the device node is more predictable. Nothing changes for g_serial and friends as long as one module is used. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-01-21usb: gadget: u_serial: convert into a moduleSebastian Andrzej Siewior
Every user of u_serial has now to select the U_SERIAL symbol instead of including the file. There is one limition with this: ports and and gs_tty_driver are global variables in u_serial. Since all users share them, there can be only one user loaded at a time i.e. either g_serial or g_nokia. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: remove usb_gadget_controller_number()Sebastian Andrzej Siewior
The bcdDevice field is defined as |Device release number in binary-coded decimal in the USB 2.0 specification. We use this field to distinguish the UDCs from each other. In theory this could be used on the host side to apply certain quirks if the "special" UDC in combination with this gadget is used. This hasn't been done as far as I am aware. In practice it would be better to fix the UDC driver before shipping since a later release might not need this quirk anymore. There are some driver in tree (on the host side) which use the bcdDevice field to figure out special workarounds for a given firmware revision. This seems to make sense. Therefore this patch converts all gadgets (except a few) to use the kernel version instead a random 2 or 3 plus the UDC number. The few that don't report kernel's version are: - webcam This one reports always a version 0x10 so allow it to do so in future. - nokia This one reports always 0x211. The comment says that this gadget works only if the UDC supports altsettings so I added a check for this. - serial This one reports 0x2400 + UDC number. Since the gadget version is 2.4 this could make sense. Therefore bcdDevice is 0x2400 here. I also remove various gadget_is_<name> macros which are unused. The remaining few macros should be moved to feature / bug bitfield. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: libcomposite: move composite.c into libcompositeSebastian Andrzej Siewior
This moves composite.c into libcomposite and updates all gadgets. Finally! Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: Provide a default implementation of default manufacturer stringSebastian Andrzej Siewior
Some gadgets provide custom entry here. Some may override it with an etntry that is also created by composite if there was no value sumbitted at all. This patch removes all "custom manufacturer" strings which are the same as these which are created by composite. Then it moves the creation of the default manufacturer string to usb_composite_overwrite_options() in case no command line argument has been used and the entry is still an empty string. By doing this we get rid of the global variable "composite_manufacturer" in composite. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: remove string override from struct usb_composite_driverSebastian Andrzej Siewior
The struct usb_composite_driver members iProduct, iSerial and iManufacturer can be entered directly via the string array. There is no need for them to appear here. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: make sure each gadget is using same index for Product, Serial,…Sebastian Andrzej Siewior
The index in usb_string array is defined by the gadget. The gadget can choose which index entry it assigns for the serial number and which the product name. The gadget has just to ensure that the descriptor contains the proper string id which is assigned by composite. If the composite layer knows the index of the "default" information which will be overwritten by module parameters, it can be used later to overwrite it. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: push VID/PID/USB BCD module option into gadgetsSebastian Andrzej Siewior
This patch moves the module options idVendor, idProduct and bcdDevice from composite.c into each gadgets. This ensures compatibility with current gadgets and removes the global variable which brings me step closer towards composite.c in libcomposite Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: libcomposite: add epautoconf.c to libcompositeSebastian Andrzej Siewior
This patch adds epautoconf.c into libcomposite and updates all gadgets. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: libcomposite: move config.c into libcompositeSebastian Andrzej Siewior
This patch moves config.c into libcomposite and updates all gadgets. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: start with libcompositeSebastian Andrzej Siewior
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: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: move bind() callback back to struct usb_composite_driverSebastian Andrzej Siewior
This partly reverts 07a18bd7 ("usb gadget: don't save bind callback in struct usb_composite_driver") and fixes new drivers. The section missmatch problems was solved by whitelisting structs in question via __ref. Cc: devel@driverdev.osuosl.org Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-09-10usb: gadget: push all usb_composite_driver structs into __refdataSebastian Andrzej Siewior
As it turns out, Sam's comment was better than I initially assumed. This patch pushes as struct usb_composite_driver data structures into __refdata section to avoid a section missmatch report from modpost because the ->bind() can be marked __init. The only downside is that modpost does not check between ->bind() and other member. However, it is temporary. Cc: Sam Ravnborg <sam@ravnborg.org> Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
2012-01-24usb: gadget: update Michal Nazarewicz's email addressMichal Nazarewicz
The m.nazarewicz@samsung.com email address is no longer valid, so this commit replaces it with mina86@mina86.com which is employer-agnostic and thus should be valid for foreseeable feature. Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2011-09-09usb gadget: clean up FSF boilerplate textKlaus Schwarzkopf
remove the following two paragraphs as they are not needed: This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc.,59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. Signed-off-by: Klaus Schwarzkopf <schwarzkopf@sensortherm.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-07-01usb: gadget: add max_speed to usb_composite_driverTatyana Brokhman
This field is used by the Gadget drivers to specify the maximum speed they support, meaning: the maximum speed they can provide descriptors for. The driver speed will be set in consideration of this value. [ balbi@ti.com : dropped the ifdeffery ] Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org> Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-10-22usb gadget: don't save bind callback in struct usb_configurationUwe Kleine-König
The bind function is most of the time only called at init time so there is no need to save a pointer to it in the configuration structure. This fixes many section mismatches reported by modpost. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> [m.nazarewicz@samsung.com: updated for -next] Signed-off-by: Michał Nazarewicz <m.nazarewicz@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-10-22usb gadget: don't save bind callback in struct usb_composite_driverMichal Nazarewicz
The bind function is most of the time only called at init time so there is no need to save a pointer to it in the composite driver structure. This fixes many section mismatches reported by modpost. Signed-off-by: Michał Nazarewicz <m.nazarewicz@samsung.com> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-10-22USB: gadget: g_multi: moved strings handling code to compositeMichal Nazarewicz
This patch removes some of the string registration from the Multifunction Composite Gadget as composite layer can handle the iManufacturer and iProduct for us. This also adds the "needs_serial" so that composite layer will issue a warning if user space fails to provide the iSerialNumber module parameter. Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-10-22USB: gadget: g_multi: fixed vendor and product IDMichal Nazarewicz
This patch fixes the vendor and product ID the gadget uses by replacing the temporary IDs that were used during development (which should never get into mainline) with proper IDs. Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-10USB: gadget: g_multi: code clean up and refactoringMichal Nazarewicz
The Multifunction Composite Gadget have been cleaned up and refactored so hopefully it looks prettier and works at least as good as before changes. A Kconfig has also been fixed to make it impossible to build FunctionFS gadget with no configurations. With this patch, if RNDIS is not chosen by the user CDC is force-selected. Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-10USB: gadget: f_mass_storage: fsg_add() renamed to fsg_bind_config()Michal Nazarewicz
Mass Storage Function had a bit unique name for function used to add it to USB configuration. Renamed as to match naming convention of other functions. Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-03-19USB: gadget/multi: cdc_do_config: remove redundant checkPeter Korsgaard
cdc_do_config() had a double ret check after fsg_add(). Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-02-16USB: g_multi: fix CONFIG_USB_G_MULTI_RNDIS usageMichal Nazarewicz
g_multi used CONFIG_USB_ETH_RNDIS to check if RNDIS option was requested where it should check for CONFIG_USB_G_MULTI_RNDIS. As a result, RNDIS was never present in g_multi regardless of configuration. This fixes changes made in commit 396cda90d228d0851f3d64c7c85a1ecf6b8ae1e8. Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-12-11USB: Added USB_ETH_RNDIS to use instead of CONFIG_USB_ETH_RNDISMichal Nazarewicz
If g_ether and g_multi are both built CONFIG_USB_ETH_RNDIS symbol may be redefined in the later and, whats even worse, g_ether's settings may affect g_multi's. This adds a USB_ETH_RNDIS symbol defined at the beginning of ether.c and multi.c according toproper KConfig settings. Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-12-11USB: g_multi: Multifunction Composite Gadget addedMichal Nazarewicz
The Multifunction Composite Gadget has two configurations consisting of Ethernet (RNDIS in first and CDC Ethernet in second configuration), CDC Serial and File-backed Storage functions. When connected to a Windows host, the first configuration is chosen thus gadget provides RNDIS Ethernet, serial and mass storage whereas when connected to Linux host, second configuration is chosen thus providing CDC Ethernet, serial and mass storage. Which configurations are built can be configured via KConfig options. Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>