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POno response from libusb_interrupt_transfer
 

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  1. POno response from libusb_interrupt_transfer
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    <p>My question is very similar to the question posed here: <a href="https://stackoverflow.com/questions/6474949/libusb-interrupt-transfer">libusb interrupt transfer</a></p> <p>I am reverse engineering a driver Linux-G13_1.0-r44.zip</p> <p>found here: <a href="http://code.google.com/p/linux-g13-driver/downloads/list" rel="nofollow noreferrer">http://code.google.com/p/linux-g13-driver/downloads/list</a></p> <p>to get it working under RHEL5. </p> <p>It seems that everything is working correctly, however the only response i get from libusb_interrupt_transfer is a timeout error "-7"</p> <p>Output of: "lsusb -v -d 046d:c21c"</p> <pre><code>Bus 006 Device 010: ID 046d:c21c Logitech, Inc. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x046d Logitech, Inc. idProduct 0xc21c bcdDevice 2.03 iManufacturer 0 iProduct 1 G13 iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 41 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 MaxPower 500mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 3 Human Interface Device bInterfaceSubClass 0 No Subclass bInterfaceProtocol 0 None iInterface 0 HID Device Descriptor: bLength 9 bDescriptorType 33 bcdHID 1.11 bCountryCode 0 Not supported bNumDescriptors 1 bDescriptorType 34 Report wDescriptorLength 61 Report Descriptor: (length is 61) Item(Global): Usage Page, data= [ 0x00 0xff ] 65280 (null) Item(Local ): Usage, data= [ 0x00 ] 0 (null) Item(Main ): Collection, data= [ 0x01 ] 1 Application Item(Global): Logical Minimum, data= [ 0x00 ] 0 Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255 Item(Local ): Usage, data= [ 0x01 ] 1 (null) Item(Global): Report ID, data= [ 0x01 ] 1 Item(Global): Report Count, data= [ 0x07 ] 7 Item(Global): Report Size, data= [ 0x08 ] 8 Item(Main ): Input, data= [ 0x02 ] 2 Data Variable Absolute No_Wrap Linear Preferred_State No_Null_Position Non_Volatile Bitfield Item(Global): Report ID, data= [ 0x03 ] 3 Item(Local ): Usage, data= [ 0x02 ] 2 (null) Item(Global): Report Count, data= [ 0xdf 0x03 ] 991 Item(Main ): Output, data= [ 0x02 ] 2 Data Variable Absolute No_Wrap Linear Preferred_State No_Null_Position Non_Volatile Bitfield Item(Global): Report ID, data= [ 0x07 ] 7 Item(Local ): Usage, data= [ 0x03 ] 3 (null) Item(Global): Report Count, data= [ 0x04 ] 4 Item(Main ): Feature, data= [ 0x02 ] 2 Data Variable Absolute No_Wrap Linear Preferred_State No_Null_Position Non_Volatile Bitfield Item(Global): Report ID, data= [ 0x04 ] 4 Item(Local ): Usage, data= [ 0x04 ] 4 (null) Item(Main ): Feature, data= [ 0x02 ] 2 Data Variable Absolute No_Wrap Linear Preferred_State No_Null_Position Non_Volatile Bitfield Item(Global): Report ID, data= [ 0x05 ] 5 Item(Local ): Usage, data= [ 0x05 ] 5 (null) Item(Main ): Feature, data= [ 0x02 ] 2 Data Variable Absolute No_Wrap Linear Preferred_State No_Null_Position Non_Volatile Bitfield Item(Global): Report ID, data= [ 0x06 ] 6 Item(Local ): Usage, data= [ 0x06 ] 6 (null) Item(Global): Report Count, data= [ 0x01 0x01 ] 257 Item(Main ): Feature, data= [ 0x02 ] 2 Data Variable Absolute No_Wrap Linear Preferred_State No_Null_Position Non_Volatile Bitfield Item(Main ): End Collection, data=none Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 2 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 1 </code></pre> <p>Defined in Constants.h:</p> <pre><code>#define G13_INTERFACE 0 #define G13_KEY_ENDPOINT 1 #define G13_LCD_ENDPOINT 2 #define G13_KEY_READ_TIMEOUT 0 #define G13_VENDOR_ID 0x046d #define G13_PRODUCT_ID 0xc21c #define G13_REPORT_SIZE 8 #define G13_LCD_BUFFER_SIZE 0x3c0 #define G13_NUM_KEYS 40 </code></pre> <p>G13.cpp:</p> <pre><code>#include "Constants.h" ... int G13::read() { unsigned char buffer[G13_REPORT_SIZE]; int size; cout &lt;&lt; "prebuffer: " &lt;&lt; buffer &lt;&lt; "\n"; cout &lt;&lt; "presize: " &lt;&lt; size &lt;&lt; "\n"; int error = libusb_interrupt_transfer(handle, LIBUSB_ENDPOINT_IN | G13_KEY_ENDPOINT, buffer, G13_REPORT_SIZE, &amp;size, 1000); cout &lt;&lt; "buffer: " &lt;&lt; buffer &lt;&lt; "\n"; cout &lt;&lt; "size: " &lt;&lt; size &lt;&lt; "\n"; if (error &amp;&amp; error != LIBUSB_ERROR_TIMEOUT) { std::map&lt;int, std::string&gt; errors; errors[LIBUSB_SUCCESS] = "LIBUSB_SUCCESS"; errors[LIBUSB_ERROR_IO] = "LIBUSB_ERROR_IO"; errors[LIBUSB_ERROR_INVALID_PARAM] = "LIBUSB_ERROR_INVALID_PARAM"; errors[LIBUSB_ERROR_ACCESS] = "LIBUSB_ERROR_ACCESS"; errors[LIBUSB_ERROR_NO_DEVICE] = "LIBUSB_ERROR_NO_DEVICE"; errors[LIBUSB_ERROR_NOT_FOUND] = "LIBUSB_ERROR_NOT_FOUND"; errors[LIBUSB_ERROR_BUSY] = "LIBUSB_ERROR_BUSY"; errors[LIBUSB_ERROR_TIMEOUT] = "LIBUSB_ERROR_TIMEOUT"; errors[LIBUSB_ERROR_OVERFLOW] = "LIBUSB_ERROR_OVERFLOW"; errors[LIBUSB_ERROR_PIPE] = "LIBUSB_ERROR_PIPE"; errors[LIBUSB_ERROR_INTERRUPTED] = "LIBUSB_ERROR_INTERRUPTED"; errors[LIBUSB_ERROR_NO_MEM] = "LIBUSB_ERROR_NO_MEM"; errors[LIBUSB_ERROR_NOT_SUPPORTED] = "LIBUSB_ERROR_NOT_SUPPORTED"; errors[LIBUSB_ERROR_OTHER] = "LIBUSB_ERROR_OTHER "; cerr &lt;&lt; "Error while reading keys: " &lt;&lt; error &lt;&lt; " (" &lt;&lt; errors[error] &lt;&lt; ")" &lt;&lt; endl; cerr &lt;&lt; "Stopping daemon" &lt;&lt; endl; return -1; } if (size == G13_REPORT_SIZE) { parse_joystick(buffer); parse_keys(buffer); send_event(EV_SYN, SYN_REPORT, 0); } return 0; } </code></pre> <p>"sudo ./Linux-G13-Driver", whilst mashing keys on the device, returns:</p> <pre><code>Found Device: 0x1abebd20 Kernel driver detached Device Loaded: 0x1abebd20 loading /root/.g13/bindings-0.properties prebuffer: � presize: 255 buffer: # size: 0 prebuffer: # presize: 0 buffer: # size: 0 prebuffer: # presize: 0 buffer: # size: 0 prebuffer: # presize: 0 ^C Segmentation fault </code></pre> <p>i included the prebuffer and presize lines just to prove that it is in fact initializing the buffer. Also as Arne mentioned in the post I referenced at the top, the device seems to open properly, and both interfaces are properly claimed. The only thing he mentioned that I'm a bit confused by is "SET_INTERFACE" and "SET_CONFIGURATION" but maybe that's a windows only thing?</p> <p>I should note that I had to do two things to get this to build correctly on rhel5:</p> <ol> <li><p>had to add "include Linux/interface.h" line to a bunch of the header files due to an unsigned reference in Linux/uinterface.h</p></li> <li><p>had to build libusb-1.0 because it wasn't included in my particular build of rhel5</p></li> </ol> <p>I'm a bit new to linux so I tried libusb-1.0.8 and libusb-1.0.9 neither to any avail. My windows instincts tell me that the libusb build is my problem and that the library is not actually recieving interrupts from the usb device for some reason.</p> <p>I apologize in advance for any major noob mistakes. Does anybody have any ideas?</p>
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