{"id":2028,"date":"2014-10-19T20:18:54","date_gmt":"2014-10-19T20:18:54","guid":{"rendered":"http:\/\/www.chalk-elec.com\/?p=2028"},"modified":"2015-05-29T04:50:08","modified_gmt":"2015-05-29T04:50:08","slug":"how-to-get-multi-touch-working-linux-and-android","status":"publish","type":"post","link":"https:\/\/www.chalk-elec.com\/?p=2028","title":{"rendered":"How to get multi-touch working (Linux and Android)"},"content":{"rendered":"

All of our panels come with USB HID multi-touch controllers and are supported by standard “hid-multitouch” driver available in mainline Linux\/Android kernel.
\n
\nIf your system already has this “hid-multitouch” driver available as a kernel module, then you can easy add multi-touch support by adding the following commands to your \/etc\/rc.local file (before “exit” statement):<\/p>\n

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<\/div><\/td>
modprobe hid-multitouch
\necho W X Y Z > \/sys\/module\/hid_multitouch\/drivers\/hid\\:hid-multitouch\/new_id<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n

where<\/p>\n

    \n
  • W<\/strong> – is USB bus number of touchscreen USB, can be figured out by “lsusb” command<\/li>\n
  • X and Y<\/strong> – are VID and PID of touchscreen USB, also can be figured out by “lsusb” command<\/li>\n
  • Z<\/strong> – is 1<\/strong> for 7″ and 10″ panels, and 259<\/strong> for 14″ and 15.6″ panels<\/li>\n<\/ul>\n
    <\/div>\n

    If your system has no “hid-multitouch” driver compiled, then the following steps are required to get multi-touch working:<\/p>\n

      \n
    1. Download kernel sources for your board.<\/li>\n
    2. Modify hid-multitouch.c file, located in kernel\/drivers\/hid\/ folder.<\/li>\n
    3. Re-build the kernel with the HID-MULTITOUCH option enabled.<\/li>\n
    4. Create an IDC (Input Device Configuration) file (required by Android only).<\/li>\n<\/ol>\n

      Let’s consider these steps in more details.<\/p>\n

        \n
      1. Modify hid-multitouch.c file<\/b>
         
        \nFirst of all, you should download kernel sources and default kernel configuration file for your board. Then, you should go to kernel\/drivers\/hid older and find there file hid-multitouch.c. This files contain VID:PID values of USB touchscreens that will be processed by hid-multitouch driver. And we should add VID:PID of our touchscreens there. They are:<\/p>\n
          \n
        • 04D8:F724<\/b> for 7″ and new 10″ touchscreens<\/li>\n
        • 0EEF:A107<\/b> for 14″ touchscreen<\/li>\n<\/ul>\n

           
          \nOpen file hid-multitouch.c<\/b>, find mt_devices[]<\/b> struct and insert the following code at the beginning of this structure define:<\/p>\n

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          static const struct hid_device_id mt_devices[] = {
          \n   
          \n    \/* Chalkboard Electronics 7" and 10" *\/
          \n    { .driver_data = MT_CLS_DEFAULT, HID_USB_DEVICE(0x04D8,0xF724) },
          \n
          \n    \/* Chalkboard Electronics 14" *\/
          \n    { .driver_data = MT_CLS_DEFAULT, HID_USB_DEVICE(0x0EEF,0xA107) },
          \n
          \n    \/\/ here the rest of definitions comes<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n

          \n\t<\/li>\n

        • Re-build the kernel with the HID-MULTITOUCH option<\/b>
           
          \nType \u201cmake menuconfig\u201d<\/b> to configure the kernel, then go to Device Drivers -> HID Devices -> Special HID drivers -> HID Multitouch panels<\/b> and select it as an embedded driver (*). Save the kernel configuration and compile it to make a zImage kernel file. Transfer the zImage file to your board.
           \n\t<\/li>\n
        • Create an IDC file<\/b>
           
          \nThis final step is required for Android only in order to match the resolution of the touch panel to HDMI. Create a plain text file as below:<\/p>\n
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          touch.deviceType = touchScreen
          \ntouch.orientationAware = 1
          \ndevice.internal = 1
          \nkeyboard.layout = qwerty
          \nkeyboard.characterMap = qwerty2
          \nkeyboard.orientationAware = 1
          \nkeyboard.builtIn = 1
          \ncursor.mode = navigation
          \ncursor.orientationAware = 1<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n

          The file name must be Vendor_xxxx_Product_yyyy.idc<\/b>, where xxxx<\/b> is VID of panel, and yyyy<\/b> is PID of panel. The filename is case sensitive!<\/b>In our case, you should use filename Vendor_04d8_Product_f724.idc (7″ and 10″ panels) or Vendor_0eef_Product_a107.idc (14″ panel). Now copy the IDC file to your Android board (Android must be rooted) with the following commands (substitute Vendor_xxxx_Product_yyyy.idc with real file name):<\/p>\n

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          adb shell
          \nsu
          \nmount -o rw,remount \/system
          \n[Ctrl-C]
          \nadb push Vendor_xxxx_Product_yyyy.idc \/system\/usr\/idc\/.
          \nadb reboot<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n<\/li>\n<\/ol>\n

           
          That’s all. Now you should get multi-touch support working.
           <\/p>\n","protected":false},"excerpt":{"rendered":"

          All of our panels come with USB HID multi-touch controllers and are supported by standard “hid-multitouch” driver available in mainline Linux\/Android kernel. If your system already has this “hid-multitouch” driver available as a kernel module, then you can easy add multi-touch support by adding the following commands to your \/etc\/rc.local file (before “exit” statement): 12modprobe […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,26],"tags":[],"class_list":["post-2028","post","type-post","status-publish","format-standard","hentry","category-blog","category-howto"],"_links":{"self":[{"href":"https:\/\/www.chalk-elec.com\/index.php?rest_route=\/wp\/v2\/posts\/2028","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.chalk-elec.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chalk-elec.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chalk-elec.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chalk-elec.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2028"}],"version-history":[{"count":10,"href":"https:\/\/www.chalk-elec.com\/index.php?rest_route=\/wp\/v2\/posts\/2028\/revisions"}],"predecessor-version":[{"id":2211,"href":"https:\/\/www.chalk-elec.com\/index.php?rest_route=\/wp\/v2\/posts\/2028\/revisions\/2211"}],"wp:attachment":[{"href":"https:\/\/www.chalk-elec.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chalk-elec.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chalk-elec.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}