This series aims at integrating configfs into hid, the way it has been done for acm, ncm, ecm, eem, ecm subset, rndis, obex, phonet, mass_storage, FunctionFS, loopback, sourcesink, uac1, uac2, uvc, midi and hid. The printer gadget before the changes has some bugs, and although it uses the composite framework, it is not ready for splitting into a reusable f_printer.c and a legacy printer.c. Most of the patches in the series are preparation for factoring out f_printer.c. Once f_printer.c is extracted from printer.c, it can be converted to use the new function interface, and then the usual procedure of adding configfs support follows. Rebased onto Felipe's master. BACKWARD COMPATIBILITY ====================== Please note that the old g_printer.ko is still available and works. There is just one minor difference, the dev node at the gadget's side is called /dev/g_printer<number> instead of /dev/g_printer. This makes sense, because there are more than one instances of this function allowed after the series is applied. If /dev/g_printer is needed, it can be easily added as a symlink with udev rules. USING THE NEW "GADGET" ====================== Please refer to this post: http://www.spinics.net/lists/linux-usb/msg76388.html for general information from Sebastian on how to use configfs-based gadgets (*). With configfs the procedure is as follows, compared to the information mentioned above (*): instead of mkdir functions/acm.ttyS1 do mkdir functions/printer.<instance name> e.g. mkdir functions/printer.usb0. In the printer.usb0 directory there will be the following attributes: pnp_string - Data to be passed to the host in pnp string q_len - Number of requests per endpoint. Below is a script which creates a printer gadget on a board with dwc2: $ modprobe libcomposite $ mount none cfg -t configfs $ mkdir cfg/usb_gadget/g1 $ cd cfg/usb_gadget/g1 $ mkdir configs/c.1 $ mkdir functions/printer.usb0 $ mkdir strings/0x409 $ mkdir configs/c.1/strings/0x409 $ echo 0x0525 > idVendor $ echo 0xa4a8 > idProduct $ echo 1 > strings/0x409/serialnumber $ echo Samsung > strings/0x409/manufacturer $ echo Printer Gadget > strings/0x409/product $ echo 10 > functions/printer.usb0/q_len $ echo "MFG:linux;MDL:g_printer;CLS:PRINTER;SN:1;" > functions/printer.usb0/pnp_string $ echo "Conf 1" > configs/c.1/strings/0x409/configuration $ echo 120 > configs/c.1/MaxPower $ ln -s functions/printer.usb0 configs/c.1 $ echo 12480000.hsotg > UDC TESTING THE FUNCTION ==================== The most basic testing: device: run the gadget, ls -l /devices/virtual/usb_printer_gadget/ should show g_printer<number>. If udev is active, then /dev/g_printer<number> should appear automatically. host: If udev is active, then e.g. /dev/usb/lp0 should appear. host->device transmission: device: # cat /dev/g_printer<number> host: # cat > /dev/usb/lp0 device->host transmission: # cat > /dev/g_printer<number> host: # cat /dev/usb/lp0 More advanced testing can be done with the prn_example described in Documentation/usb/gadget-printer.txt. Andrzej Pietrasiewicz (29): usb: gadget: composite: don't try standard handling for non-standard requests usb: gadget: printer: enqueue printer's response for setup request usb: gadget: printer: remove unused and empty printer_unbind usb: gadget: printer: eliminate random pointer dereference usb: gadget: printer: revert usb_add_function() effect in error recovery usb: gadget: printer: add missing error handling usb: gadget: printer: eliminate pdev member of struct printer_dev usb: gadget: printer: follow the naming convention for usb_add_config callback usb: gadget: printer: standardize printer_do_config usb: gadget: printer: move function-related bind code to function's bind usb: gadget: printer: call usb_add_function() last usb: gadget: printer: move function-related unbind code to function's unbind usb: gadget: printer: define pnp string buffer length usb: gadget: printer: don't access file global pnp_string in function's code usb: gadget: printer: add setup and cleanup functions usb: gadget: printer: call gprinter_setup() from gadget's bind usb: gadget: printer: eliminate file global printer_mutex usb: gadget: printer: don't access file global usb_printer_gadget in function's code usb: gadget: printer: add container_of helper for printer_dev usb: gadget: composite: add req_match method to usb_function usb: gadget: printer: name class specific requests usb: gadget: printer: add req_match for printer function usb: gadget: printer: allocate printer_dev instances dynamically usb: gadget: printer: factor out f_printer usb: gadget: f_printer: convert to new function interface with backward compatibility usb: gadget: printer: convert to new interface of f_printer usb: gadget: f_printer: remove compatibility layer usb: gadget: printer: use module_usb_composite_driver helper macro usb: gadget: printer: add configfs support .../ABI/testing/configfs-usb-gadget-printer | 9 + Documentation/usb/gadget-testing.txt | 47 + drivers/usb/gadget/Kconfig | 16 + drivers/usb/gadget/composite.c | 14 +- drivers/usb/gadget/function/Makefile | 2 + drivers/usb/gadget/function/f_printer.c | 1473 ++++++++++++++++++++ drivers/usb/gadget/function/u_printer.h | 40 + drivers/usb/gadget/legacy/Kconfig | 1 + drivers/usb/gadget/legacy/printer.c | 1239 +--------------- include/linux/usb/composite.h | 3 + 10 files changed, 1652 insertions(+), 1192 deletions(-) create mode 100644 Documentation/ABI/testing/configfs-usb-gadget-printer create mode 100644 drivers/usb/gadget/function/f_printer.c create mode 100644 drivers/usb/gadget/function/u_printer.h -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
