dmesg
[   50.693088] ===========================gslx680_ts_init=====================
[   50.695550] _fetch_sysconfig_para.
[   50.698526] gslx680 firmware gslx680.fw.
[   50.717174] _fetch_sysconfig_para: after: ctp_twi_addr is 0x40, dirty_addr_buf: 0x40. dirty_addr_buf[1]: 0xfffe
[   50.723036] _fetch_sysconfig_para: ctp_twi_id is 1.
[   50.727235] _fetch_sysconfig_para: screen_max_x = 800.
[   50.731883] _fetch_sysconfig_para: screen_max_y = 480.
[   50.735977] _fetch_sysconfig_para: revert_x_flag = 0.
[   50.740077] _fetch_sysconfig_para: revert_y_flag = 0.
[   50.744904] _fetch_sysconfig_para: exchange_x_y_flag = 0.
[   50.747989] bus: 'i2c': add driver gslx680
[   50.756965] i2c-core: driver [gslx680] using legacy suspend method
[   50.762024] i2c-core: driver [gslx680] using legacy resume method
[   50.773006] ctp_detect: Detected chip gslx680 at adapter 1, address 0x40
[   50.776720] device: '1-0040': device_add
[   50.779744] bus: 'i2c': add device 1-0040
[   50.783430] PM: Adding info for i2c:1-0040
[   50.792205] bus: 'i2c': driver_probe_device: matched device 1-0040 with driver gslx680
[   50.806460] bus: 'i2c': really_probe: probing driver gslx680 with device 1-0040
[   50.809903] ====gslx680_ts_probe begin=====.
[   50.812570] ==kzalloc success=
[   50.815369] [GSLX680] Enter gsl_ts_init_ts
[   50.819567] ctp_set_irq_mode: config gpio to int mode.
[   50.825908] ctp_set_irq_mode, 851: gpio_int_info, port = 7, port_num = 11.
[   50.827847]  INTERRUPT CONFIG
[   50.831162] device: 'input1': device_add
[   50.834610] PM: Adding info for No Bus:input1
[   50.856128] input: gslx680 as /devices/platform/sunxi-i2c.1/i2c-1/1-0040/input/input1
[   50.859061] device: 'mouse0': device_add
[   50.865273] PM: Adding info for No Bus:mouse0
[   50.884452] device: 'event1': device_add
[   50.890963] PM: Adding info for No Bus:event1
[   51.001134] =============gsl_load_fw start==============
[   51.004064] device: '1-0040': device_add
[   51.007428] PM: Adding info for No Bus:1-0040
[   51.023288] firmware 1-0040: firmware: requesting gslx680.fw
[   51.052182] PM: Removing info for No Bus:1-0040
[   51.072900] rc = 0
[   53.073450] =============gsl_load_fw end==============
[   53.380005] ==gslx680_ts_probe over =
[   53.385425] driver: '1-0040': driver_bound: bound to device 'gslx680'
[   53.391510] bus: 'i2c': really_probe: bound device 1-0040 to driver gslx680


/var/log/Xorg.0.log
[    50.875] (II) config/udev: Adding input device gslx680 (/dev/input/mouse0)
[    50.876] (II) No input driver specified, ignoring this device.
[    50.876] (II) This device may have been added with another device file.
[    50.893] (II) config/udev: Adding input device gslx680 (/dev/input/event1)
[    50.893] (**) gslx680: Applying InputClass "evdev touchscreen catchall"
[    50.893] (II) Using input driver 'evdev' for 'gslx680'
[    50.893] (II) Loading /usr/lib/xorg/modules/input/evdev_drv.so
[    50.894] (**) gslx680: always reports core events
[    50.894] (**) evdev: gslx680: Device: "/dev/input/event1"
[    50.905] (--) evdev: gslx680: Vendor 0 Product 0
[    50.905] (--) evdev: gslx680: Found absolute axes
[    50.905] (--) evdev: gslx680: Found absolute multitouch axes
[    50.905] (--) evdev: gslx680: Found x and y absolute axes
[    50.905] (--) evdev: gslx680: Found absolute touchscreen
[    50.905] (II) evdev: gslx680: Configuring as touchscreen
[    50.905] (**) evdev: gslx680: YAxisMapping: buttons 4 and 5
[    50.905] (**) evdev: gslx680: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[    50.906] (**) Option "config_info" "udev:/sys/devices/platform/sunxi-i2c.1/i2c-1/1-0040/input/input1/event1"
[    50.906] (II) XINPUT: Adding extended input device "gslx680" (type: TOUCHSCREEN, id 7)
[    50.906] (II) evdev: gslx680: initialized for absolute axes.
[    50.907] (**) gslx680: (accel) keeping acceleration scheme 1
[    50.907] (**) gslx680: (accel) acceleration profile 0
[    50.907] (**) gslx680: (accel) acceleration factor: 2.000
[    50.907] (**) gslx680: (accel) acceleration threshold: 4

evtest
/dev/input/event0:	axp20-supplyer
/dev/input/event1:	gslx680
Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
Input device name: "gslx680"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 330 (BTN_TOUCH)
  Event type 3 (EV_ABS)
    Event code 0 (ABS_X)
      Value      0
      Min        0
      Max      800
    Event code 1 (ABS_Y)
      Value      0
      Min        0
      Max      480
    Event code 24 (ABS_PRESSURE)
      Value      0
      Min        0
      Max      255
    Event code 47 (ABS_MT_SLOT)
      Value      0
      Min        0
      Max       10
    Event code 48 (ABS_MT_TOUCH_MAJOR)
      Value      0
      Min        0
      Max      255
    Event code 50 (ABS_MT_WIDTH_MAJOR)
      Value      0
      Min        0
      Max      200
    Event code 53 (ABS_MT_POSITION_X)
      Value      0
      Min        0
      Max      800
    Event code 54 (ABS_MT_POSITION_Y)
      Value      0
      Min        0
      Max      480
    Event code 57 (ABS_MT_TRACKING_ID)
      Value      0
      Min        0
      Max    65535
Testing ... (interrupt to exit)

Touching the screen at this point does nothing.