硬件平臺:sen_A20
系統版本:Android 4.2.2
內核版本:linux3.3
固件版本:v1.2
電阻屏:17寸 EETI eGTouch (USB)
一、配置內核
(1)配置.config
1. CONFIG_INPUT_EVDEV
2. CONFIG_INPUT_UINPUT
3. CONFIG_HIDRAW ( for USB Interface )
可以使用make menuconfig ARCH=arm命令選中:
< * > Event interface
< * > User level driver suport
--HID Devices
< * > /dev/hidraw raw HID device support
(2)檢查是否被選中
CONFIG_INPUT_EVDEV=y
CONFIG_INPUT_UINPUT=y
CONFIG_HIDRAW=y
二、修改驅動代碼:
1、
1. /SourceCode/drivers/input/evdev.c 添加
static bool evdev_match(struct input_handler *handler, struct input_dev *dev)
{
/* Avoid EETI USB touchscreens */
#define VID_EETI 0x0EEF
if ((BUS_USB == dev->id.bustype) && (VID_EETI == dev->id.vendor))
return false;
return true;
}
static struct input_handler evdev_handler = {
.event = evdev_event,
.match = evdev_match, /* Added by EETI*/
.connect = evdev_connect,
.disconnect = evdev_disconnect,
.fops = &evdev_fops,
.minor = EVDEV_MINOR_BASE,
.name = "evdev",
.id_table = evdev_ids,
};
2. /SourceCode/drivers/input/mousedev.c
static bool mousedev_match(struct input_handler *handler, struct input_dev *dev)
{
/* Avoid EETI USB touchscreens */
#define VID_EETI 0x0EEF
if ((BUS_USB == dev->id.bustype) && (VID_EETI == dev->id.vendor))
return false;
/* Avoid EETI virtual devices */
if ((BUS_VIRTUAL == dev->id.bustype) && (VID_EETI == dev->id.vendor))
return false;
return true;
}
static struct input_handler mousedev_handler = {
.event = mousedev_event,
.match = mousedev_match, /* Added by EETI */
.connect = mousedev_connect,
.disconnect = ousedev_disconnect,
.fops = &mousedev_fops,
.minor = MOUSEDEV_MINOR_BASE,
.name = "mousedev",
.id_table = mousedev_ids,
}
3. /SourceCode/drivers/input/joydev.c
static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
{
/* Avoid touchpads and touchscreens */
if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
return false;
/* Avoid tablets, digitisers and similar devices */
if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit))
return false;
/* Avoid EETI virtual devices */
#define VID_EETI 0x0EEF
if (( BUS_VIRTUAL == dev->id.bustype) && (VID_EETI == dev->id.vendor))
return false;
return true;
}
static struct input_handler joydev_handler = {
.event = joydev_event,
.match = joydev_match,
.connect = joydev_connect,
.disconnect = joydev_disconnect,
.fops = &joydev_fops,
.minor = JOYDEV_MINOR_BASE,
.name = "joydev",
.id_table = joydev_ids,
};
三、編譯內核、系統,將固件燒寫到板子上(用串口工具查看)
1、在終端輸入“cat /proc/bus/input/devices“
2、將廠商攜帶的文件放到android目錄下:
廠家提供有四個文件:
a) eGTouchD: a daemon service driver for EETI touch controller.
b) eGTouchA.ini : a parameter list could be loaded by driver
c) eGalaxTouch_VirtualDevice.idc: a file necessary for Android 3.0 upwards
d) eGalaxCalibrator: a tool provides calibration and line drawing.
(1)將eGTouchD放到 system/bin目錄下,並修改init.rc文件
添加: service eGTouchD /system/bin/eGTouchD
user root
group root
oneshot
(2)將 eGalaxTouch_VirtualDevice.idc放到system/usr/idc目錄下
(3)將 eGTouchA.ini文件放到/data目錄下:
*爲了方便,我們可以將這三個文件放在device\softwinner\sugar-ref001目錄下:通過配置sugar-ref001.mk將文件移動到相對於的位置。編譯燒寫即可
這裏要詳細說明下:在文件系統啓動的時候eGTouchD這個文件會檢測data目錄下是否有這個文件,如果沒有就自動創建,而系統自動創建的這個文件跟自己配的有所差異
,這是廠商的一個BUG,我們可以在文件系統加載的時候,同時也啓動這個文件,不讓他自動生成。
首先,在device\softwinner\sugar-ref001\sugar-ref001.mk添加:
PRODUCT_COPY_FILES += \
device/softwinner/sugar-ref001/eGTouchD:system/bin/eGTouchD
\
device/softwinner/sugar-ref001/eGalaxTouch_VirtualDevice.idc:system/usr/idc/eGalaxTouch_VirtualDevice.idc
\
device/softwinner/sugar-ref001/eGTouchA.ini:data/eGTouchA.ini
\
這樣就eGTouchA.ini就會打包在userdate.img裏面。但是有時我們不想將userdate.img掛載上去,比如:我1G的內存,如果掛載上去,系統只能識別到可用只有128M,顯然是不理想的。如果你生硬不掛載userdate.img上去,那麼系統會自動創建eGTouchA.ini,這樣會造成在觸摸的過程中會出現死機的現象。那麼我們可以修改:
將device/softwinner/sugar-ref001/eGTouchA.ini:data/eGTouchA.ini 修改爲 /device/softwinner/sugar-ref001/eGTouchA.ini:system/eGTouchA.ini \
將他移動到system目錄下,然後我們在android/out/…/suger-ref001/root目錄下 的int.rc文件裏添加
copy /system/eGTouchA.ini /data/eGTouchA.ini
chmod 0777 /data/eGTouchA.ini
注意要添加權限:
然後打包成固件燒寫,收工。
這個觸摸屏調試了總共花了將近一週的時間,一開始不知道有eGTouchA.ini這個文件有BUG,在測試的時候用adb pull出來才發現兩個文件並不一樣(詳細配置看說明,這裏不介紹),之後問了廠商才得知系統會自動創建。
記錄一下,以備忘記,如果哪裏有不對,請指出!謝謝