On Fri, Dec 14, 2012 at 01:58:03PM +0800, victor wrote: > Hi, > > > > > > > > > > > # ls /dev/mmc* > > > > > /dev/mmc0 /dev/mmc2 /dev/mmcblk0p1 > > > > > /dev/mmc1 /dev/mmcblk0 /dev/mmcblk0p2 > > > > > > > > > > # mount /dev/mmcblk0 /mnt > > > > > # ls /mnt/ > > > > > initramfs.gz > > > > > # umount /mnt > > > > > umounting 1 > > > > > umounting 0 > > > > > # insmod kagen2_udc.ko > > > > > # insmod g_file_storage.ko file=/dev/mmcblk0 > > > > > insmod: can't insert 'g_file_storage.ko': No such device > > > > > > > > are you registering your udc with the udc class ?? Are you > > > > initilizing > > > > udc->gadget.dev ? Look at other udc drivers to check if you're > > > > udc->missing > > > > something. For example look at > > > > drivers/usb/dwc3/gadget.c::dwc3_gadget_init() to see how I register > > > > the gadget device and how I add the gadget to the list of UDCs. > > > > > > > > Also look at drivers/usb/dwc3/gadget.c::dwc3_gadget_start() to see > > > > how > > > that > > > > should be implemented. > > > > -- > > > > balbi > > > > > > I look at drivers/usb/dwc3/gadget.c and compare to my UDC code. The > > > difference is my UDC probe function is declared in platform driver, > > > and the platform probe function is not called. How could the file > > > storage gadget know it needs to call my UDC code? Is it done by the > > > platform_add_devices(struct platform_device **pdevs, int ndev) which > > > is to add UDC driver to the linux system? > > > > > > Here is my probe function. Somehow, It is not called after insmod. > > > > if it's not called it's because you don't have a matching platform_device. > > > > For a driver's probe() to be called you need a platform_device with the > same > > name. > > -- > > balbi > > Thanks. The driver's probe() can be called. Now when insmod > g_file_storage.ko, it says the file-backed storage gadget failed to start. I > have defined the udc_start() function in usb_gadget_ops structure and added > the udc_start() function. What else do I need to add? > > Here is the message at console: > > # insmod kagen2_udc.ko > # insmod g_file_storage.ko file=/dev/mmcblk0 > gadget: controller 'kagen2_usb' not recognized this should have caught your attention!! Also, rebase to a newer kernel as that message has already been dropped. -- balbi
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