Hey Andreas,
Did you try using the path {0xffa00001,0xffa00002,0xffa10006}?
Thanks!On Tue, Dec 21, 2010 at 7:30 AM, Andreas Holzhammer - GMX < [email protected]> wrote: > Hi, > > I'm trying to adapt a USB LCD driver (graphlcd, dm140gink) from using > direct ioctls to a libhid based solution. > > Unfortunately I can't get the dm140gink to accept the data I send. The > original driver can be found at > http://developer.berlios.de/patch/download.php?id=2627. > > I've modified test_libhid.c to access my LCD display, and get the following > paths: > > device identification of HIDInterface 002/004[0]: > dev_handle: 0x09a50580 > device: 0x09a4b178 > location: 002/004 > manufacturer: DM-140GINK Demo > product: DM-140GINK Demo > TRACE: hid_reset_parser(): resetting the HID parser for USB device > 002/004[0]... > TRACE: hid_dump_tree(): iterating the parse tree for USB device > 002/004[0]... > parse tree of HIDInterface 002/004[0]: > path: 0xffa00001.0xffa00002.0xffa10003; type: 0x80 > path: 0xffa00001.0xffa00002.0xffa10004; type: 0x80 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x80 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x80 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x80 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x80 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x80 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x80 > path: 0xffa00001.0xffa00002.0xffa10005; type: 0x90 > path: 0xffa00001.0xffa00002.0xffa10006; type: 0x90 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x90 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x90 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x90 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x90 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x90 > path: 0xffa00001.0xffa00002.0x00000000; type: 0x90 > TRACE: hid_reset_parser(): resetting the HID parser for USB device > 002/004[0]... > > Then I added a first output command to test_libhid.c to send the the first > initialisation command (taken from the above source, "panelCmd") to the > device: > > unsigned char const PATHLEN = 3; > int const PATH_IN[] = { 0xffa00001, 0xffa00002, 0xffa10003 }; > int const PATH_OUT[] = { 0xffa00001, 0xffa00002, 0xffa10005 }; > unsigned char const SEND_PACKET_LEN = 8; > char const PACKET[] = {0x01, 0x01, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00}; > ret = hid_set_output_report(hid, PATH_OUT, PATHLEN, PACKET, > SEND_PACKET_LEN); > if (ret != HID_RET_SUCCESS) { > fprintf(stderr, "hid_set_output_report failed with return code %d\n", > ret); > } > > But this command times out: > > TRACE: hid_set_output_report(): looking up report ID... > TRACE: hid_prepare_parse_path(): preparing search path of depth 3 for > parse tree of USB device 002/004[0]... > TRACE: hid_prepare_parse_path(): search path prepared for parse tree of > USB device 002/004[0]. > NOTICE: hid_find_object(): found requested item. > TRACE: hid_set_output_report(): sending report ID 0x00 (length: 8) to USB > device 002/004[0]... > WARNING: hid_set_output_report(): failed to send report to USB device > 002/004[0]:error sending control message: Connection timed out. > hid_set_output_report failed with return code 19 > TRACE: hid_close(): closing USB device 002/004[0]... > > I've also tried to only pass 0xffa10005 as PATH, as suggested in the > original code (in the SendReport function). > > Not sure, but this might be related to the original drivers initialisation > code, which I have no idea how to implement in libhid: > //****************************************************** > // Initialize the internal report structures > //****************************************************** > if(ioctl(fd, HIDIOCINITREPORT,0)<0) > > Unfortunaltey I don't have any documentation on the DM140gink device, so I > have to rely on the existing graphlcd source code (which doesn't provide > access to some of the features of the LCD). > > Any help greatly appreciated. > > Thanks, > > Andreas > > _______________________________________________ > libhid-discuss mailing list > [email protected] > http://lists.alioth.debian.org/mailman/listinfo/libhid-discuss > http://libhid.alioth.debian.org/ > -- Shiva
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