tree: https://github.com/AsahiLinux/linux touchpad/wip head: a2281d64fdbcbab0dae68c6ea75bd5b548332e06 commit: 23cee793a43b082dfa9c9a58a0fb9604c5825d7a [80/82] WIP: HID: Add hid-appleft for Apple Macbook Trackpads config: nds32-allyesconfig (https://download.01.org/0day-ci/archive/20211215/202112152315.IFJ9Vy6H-lk...) compiler: nds32le-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/AsahiLinux/linux/commit/23cee793a43b082dfa9c9a58a0fb96... git remote add asahilinux https://github.com/AsahiLinux/linux git fetch --no-tags asahilinux touchpad/wip git checkout 23cee793a43b082dfa9c9a58a0fb9604c5825d7a # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nds32 SHELL=/bin/bash drivers/hid/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/hid/hid-appleft.c:105: warning: Function parameter or member 'unknown_or_origin1' not described in 'tp_finger' drivers/hid/hid-appleft.c:105: warning: Function parameter or member 'unknown_or_origin2' not described in 'tp_finger' vim +68 drivers/hid/hid-appleft.c 43 44 /** 45 * struct magicmouse_sc - Tracks Magic Mouse-specific data. 46 * @input: Input device through which we report events. 47 * @quirks: Currently unused. 48 * @ntouches: Number of touches in most recent touch report. 49 * @scroll_accel: Number of consecutive scroll motions. 50 * @scroll_jiffies: Time of last scroll motion. 51 * @touches: Most recent data for a touch, indexed by tracking ID. 52 * @tracking_ids: Mapping of current touch input data to @touches. 53 */ 54 struct appleft_sc { 55 struct input_dev *input; 56 unsigned long quirks; 57 58 int ntouches; 59 60 struct input_mt_pos pos[MAX_CONTACTS]; 61 int slots[MAX_CONTACTS]; 62 u8 map_contacs[MAX_CONTACTS]; 63 64 struct hid_device *hdev; 65 struct delayed_work work; 66 67 int x_min, y_min, x_max, y_max; 69 70 /** 71 * struct tp_finger - single trackpad finger structure, le16-aligned 72 * 73 * @origin: zero when switching track finger 74 * @abs_x: absolute x coordinate 75 * @abs_y: absolute y coordinate 76 * @rel_x: relative x coordinate 77 * @rel_y: relative y coordinate 78 * @tool_major: tool area, major axis 79 * @tool_minor: tool area, minor axis 80 * @orientation: 16384 when point, else 15 bit angle 81 * @touch_major: touch area, major axis 82 * @touch_minor: touch area, minor axis 83 * @unused: zeros 84 * @pressure: pressure on forcetouch touchpad 85 * @multi: one finger: varies, more fingers: constant 86 * @crc16: on last finger: crc over the whole message struct 87 * (i.e. message header + this struct) minus the last 88 * @crc16 field; unknown on all other fingers. 89 */ 90 struct tp_finger { 91 __le16 unknown_or_origin1; 92 __le16 unknown_or_origin2; 93 __le16 abs_x; 94 __le16 abs_y; 95 __le16 rel_x; 96 __le16 rel_y; 97 __le16 tool_major; 98 __le16 tool_minor; 99 __le16 orientation; 100 __le16 touch_major; 101 __le16 touch_minor; 102 __le16 unused[2]; 103 __le16 pressure; 104 __le16 multi; 105 } __attribute__((packed, aligned(2))); 106 107 /** 108 * struct trackpad report 109 * 110 * @report_id: reportid 111 * @buttons: HID Usage Buttons 3 1-bit reports 112 * @num_fingers: the number of fingers being reported in @fingers 113 * @clicked: same as @buttons 114 */ 115 struct tp_header { 116 // HID mouse report 117 u8 report_id; 118 u8 buttons; 119 u8 rel_x; 120 u8 rel_y; 121 u8 padding[4]; 122 // HID vendor part, up to 1751 bytes 123 u8 unknown[22]; 124 u8 num_fingers; 125 u8 clicked; 126 u8 unknown3[14]; 128 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org