嵌入式Linux HID多指触控/触摸设备报表描述符-编程知识

这里只做一下简单记录，更为详细的修改流程后续的文章再介绍。
报表描述符

0x05, 0x0D,        // Usage Page (Digitizer)
0x09, 0x04,        // Usage (Touch Screen)
0xA1, 0x01,        // Collection (Application)
0x85, 0x01,        //   Report ID (1)
0x09, 0x22,        //   Usage (Finger)
0xA1, 0x02,        //   Collection (Logical)
0x09, 0x42,        //     Usage (Tip Switch)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x75, 0x01,        //     Report Size (1)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        //     Report Count (2)
0x81,
0x03,        //     Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x51,        //     Usage (0x51)
0x25, 0x1F,        //     Logical Maximum (31)
0x75, 0x05,        //     Report Size (5)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x75, 0x10,        //     Report Size (16)
0x09, 0x30,        //     Usage (X)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x31,        //     Usage (Y)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x0D,        //   Usage Page (Digitizer)
0x09, 0x22,        //   Usage (Finger)
0xA1, 0x02,        //   Collection (Logical)
0x09, 0x42,        //     Usage (Tip Switch)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x75, 0x01,        //     Report Size (1)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        //     Report Count (2)
0x81,
0x03,        //     Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x51,        //     Usage (0x51)
0x25, 0x1F,        //     Logical Maximum (31)
0x75, 0x05,        //     Report Size (5)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x75, 0x10,        //     Report Size (16)
0x09, 0x30,        //     Usage (X)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x31,        //     Usage (Y)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x0D,        //   Usage Page (Digitizer)
0x09, 0x22,        //   Usage (Finger)
0xA1, 0x02,        //   Collection (Logical)
0x09, 0x42,        //     Usage (Tip Switch)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x75, 0x01,        //     Report Size (1)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        //     Report Count (2)
0x81,
0x03,        //     Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x51,        //     Usage (0x51)
0x25, 0x1F,        //     Logical Maximum (31)
0x75, 0x05,        //     Report Size (5)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x75, 0x10,        //     Report Size (16)
0x09, 0x30,        //     Usage (X)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x31,        //     Usage (Y)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x0D,        //   Usage Page (Digitizer)
0x09, 0x22,        //   Usage (Finger)
0xA1, 0x02,        //   Collection (Logical)
0x09, 0x42,        //     Usage (Tip Switch)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x75, 0x01,        //     Report Size (1)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        //     Report Count (2)
0x81,
0x03,        //     Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x51,        //     Usage (0x51)
0x25, 0x1F,        //     Logical Maximum (31)
0x75, 0x05,        //     Report Size (5)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x75, 0x10,        //     Report Size (16)
0x09, 0x30,        //     Usage (X)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x31,        //     Usage (Y)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x0D,        //   Usage Page (Digitizer)
0x09, 0x22,        //   Usage (Finger)
0xA1, 0x02,        //   Collection (Logical)
0x09, 0x42,        //     Usage (Tip Switch)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x75, 0x01,        //     Report Size (1)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        //     Report Count (2)
0x81,
0x03,        //     Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x51,        //     Usage (0x51)
0x25, 0x1F,        //     Logical Maximum (31)
0x75, 0x05,        //     Report Size (5)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x75, 0x10,        //     Report Size (16)
0x09, 0x30,        //     Usage (X)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x31,        //     Usage (Y)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x0D,        //   Usage Page (Digitizer)
0x09, 0x22,        //   Usage (Finger)
0xA1, 0x02,        //   Collection (Logical)
0x09, 0x42,        //     Usage (Tip Switch)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x75, 0x01,        //     Report Size (1)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        //     Report Count (2)
0x81,
0x03,        //     Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x51,        //     Usage (0x51)
0x25, 0x1F,        //     Logical Maximum (31)
0x75, 0x05,        //     Report Size (5)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x75, 0x10,        //     Report Size (16)
0x09, 0x30,        //     Usage (X)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x31,        //     Usage (Y)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x0D,        //   Usage Page (Digitizer)
0x09, 0x22,        //   Usage (Finger)
0xA1, 0x02,        //   Collection (Logical)
0x09, 0x42,        //     Usage (Tip Switch)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x75, 0x01,        //     Report Size (1)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        //     Report Count (2)
0x81,
0x03,        //     Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x51,        //     Usage (0x51)
0x25, 0x1F,        //     Logical Maximum (31)
0x75, 0x05,        //     Report Size (5)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x75, 0x10,        //     Report Size (16)
0x09, 0x30,        //     Usage (X)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x31,        //     Usage (Y)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x0D,        //   Usage Page (Digitizer)
0x09, 0x22,        //   Usage (Finger)
0xA1, 0x02,        //   Collection (Logical)
0x09, 0x42,        //     Usage (Tip Switch)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x75, 0x01,        //     Report Size (1)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        //     Report Count (2)
0x81,
0x03,        //     Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x51,        //     Usage (0x51)
0x25, 0x1F,        //     Logical Maximum (31)
0x75, 0x05,        //     Report Size (5)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x75, 0x10,        //     Report Size (16)
0x09, 0x30,        //     Usage (X)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x31,        //     Usage (Y)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x0D,        //   Usage Page (Digitizer)
0x09, 0x22,        //   Usage (Finger)
0xA1, 0x02,        //   Collection (Logical)
0x09, 0x42,        //     Usage (Tip Switch)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x75, 0x01,        //     Report Size (1)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        //     Report Count (2)
0x81,
0x03,        //     Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x51,        //     Usage (0x51)
0x25, 0x1F,        //     Logical Maximum (31)
0x75, 0x05,        //     Report Size (5)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x75, 0x10,        //     Report Size (16)
0x09, 0x30,        //     Usage (X)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x31,        //     Usage (Y)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x0D,        //   Usage Page (Digitizer)
0x09, 0x22,        //   Usage (Finger)
0xA1, 0x02,        //   Collection (Logical)
0x09, 0x42,        //     Usage (Tip Switch)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x75, 0x01,        //     Report Size (1)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        //     Report Count (2)
0x81,
0x03,        //     Input (Const,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x51,        //     Usage (0x51)
0x25, 0x1F,        //     Logical Maximum (31)
0x75, 0x05,        //     Report Size (5)
0x95, 0x01,        //     Report Count (1)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x75, 0x10,        //     Report Size (16)
0x09, 0x30,        //     Usage (X)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x31,        //     Usage (Y)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x81,
0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0x05, 0x0D,        //   Usage Page (Digitizer)
0x15, 0x00,        //   Logical Minimum (0)
0x27, 0xFF, 0xFF, 0x00, 0x00,  //   Logical Maximum (65534)
0x75, 0x10,        //   Report Size (16)
0x95, 0x01,        //   Report Count (1)
0x09, 0x56,        //   Usage (0x56)
0x81,
0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x25, 0x0A,        //   Logical Maximum (10)
0x75, 0x08,        //   Report Size (8)
0x09, 0x54,        //   Usage (0x54)
0x81,
0x02,        //   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x85, 0x02,        //   Report ID (2)
0x09, 0x55,        //   Usage (0x55)
0xB1,
0x02,        //   Feature (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0xC0,              // End Collection// 548 bytes
如果直接使用报表描述符是无法使用的，因为描述符内有feature特性，而linux内核自动对此响应了00。需要修改内核（这里以kernel4.19版本为例）。
修改kernel/drivers/usb/gadget/function/f_hid.c的hidg_setup方法
进行如下修改