On Friday 22 November 2013 10:25 PM, Greg KH wrote:
On Fri, Nov 22, 2013 at 04:47:10PM +0530, Bhavik Kothari wrote:Hi, I have been working on USB3.0 device driver and wanted to support USB3.0 HID (keyboard). To support HID Keyboard device, I have made below Interface descriptor: Interface Descriptor with alternate settings 0: bLength = 0x9; bDescriptorType = 0x4 (USB_DT_INTERFACE); bInterfaceNumber = 0x0; bAlternateSetting = 0x0; bNumEndpoints = 0x0; bInterfaceClass = (0x3) USB_CLASS_HID; bInterfaceSubClass = 0x0; bInterfaceProtocol = 0x1 (keyboard); iInterface = 0x0; Interface Descriptor with alternate settings 1 along with Super speed endpoints: bLength = 0x9; bDescriptorType = 0x4 (USB_DT_INTERFACE); bInterfaceNumber = 0x0; bAlternateSetting = 0x1; bNumEndpoints = 0x2; (One for EP IN Interrupt and other for EP OUT Interrupt) bInterfaceClass = (0x3) USB_CLASS_HID; bInterfaceSubClass = 0x0; bInterfaceProtocol = 0x1 (keyboard); iInterface = 0x0; However, when xHCI does set_config at that time Interface zero and alternate setting is zero, it never does set_interface with interface zero and alternate setting one, hence host does not detect HID device. So, would you please assist me that what I have to do, so host does set interface with alternate setting one.It's up to a userspace program to switch to the alternate interface, right? The OS can't just "know" to do that without some type of interaction from you. Have you run your device under the USB verification test suite for Windows? I suggest you do that first, to ensure the firmware is working properly before worrying about how Linux is handling the device. thanks, greg k-h .
Hi Greg, Yes, I have run USB3.0 device with USB verification test suite (USB3.0 CV) for Windows, and it passes all test points. However, with same implementation, host does not issue set interface with alternate setting one. I am not sure what to do either from device or Host side, so, Host (xHCI) issues set interface with interface number zero or any other with alternate setting one or more than zero (because alternate setting zero is alloted for control ep, if transfer type is periodic (Interrupt / Isochronous)) Can you please assist me on this, what should I do / implement? Thanks, Bhavik Kothari -- 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
