文件synaptics_dsx_core.c，该驱动为内核原本的驱动，其中添加了函数synaptics_rmi4_f12_abs_report_me为关键代码用来向输入子系统报告触摸屏操作。通过封装synaptics_rmi4_f12_abs_report_me实现2个函数，set_input_touch_slide，set_input_touch_click分别实现滑动和点击事件
//该函数为实现触摸关键函数
//stop为控制是触摸还是停止,true为手指离开，false为手指还在屏幕上
//x，y位坐标
static int synaptics_rmi4_f12_abs_report_me(bool stop,int x,int y)
{
int wx;
int wy;
//判断是手指是否离开触摸屏
if(stop == true){
data_me.object_type_and_status = 20;
}else{
data_me.object_type_and_status = F12_FINGER_STATUS;
}
wx = 0;
wy = 0;
switch (data_me.object_type_and_status) {
case F12_FINGER_STATUS:
case F12_GLOVED_FINGER_STATUS:
/* Stylus has priority over fingers */
printk(KERN_ALERT "zeyu F12_GLOVED_FINGER_STATUS\n");
//向输入子系统报告触摸屏触摸信息，p_inputdev为触摸屏设备的指针，该指针我是通过正常驱动函数中拿到的，当然也可以通过其他途径，大家自行考虑
input_mt_slot(p_inputdev,0);
input_mt_report_slot_state(p_inputdev,
MT_TOOL_FINGER, 1);
input_report_key(p_inputdev,
BTN_TOUCH, 1);
input_report_key(p_inputdev,
BTN_TOOL_FINGER, 1);
input_report_abs(p_inputdev,
ABS_MT_POSITION_X, x);
input_report_abs(p_inputdev,
ABS_MT_POSITION_Y, y);
input_report_abs(p_inputdev,
ABS_MT_TOUCH_MAJOR,
synaptics_sqrt(wx*wx + wy*wy));
input_report_abs(p_inputdev,
ABS_MT_TOUCH_MINOR,
min(wx, wy));
input_report_abs(p_inputdev,
ABS_MT_PRESSURE, 1);
break;
default:
//当手指离开触摸屏时执行到这里
printk(KERN_ALERT "zeyu default\n");
input_mt_slot(p_inputdev, 0);
input_mt_report_slot_state(p_inputdev,
MT_TOOL_FINGER, 0);
break;
}
//该函数执行立即同步，不然会有延迟
input_sync(p_inputdev);
return 0;
}
//该函数为实现点击触摸屏
void set_input_touch_click(int x,int y)
{
//这是为了模拟更像所以多调用几次
synaptics_rmi4_f12_abs_report_me(false,x,y);
synaptics_rmi4_f12_abs_report_me(false,x,y);
synaptics_rmi4_f12_abs_report_me(false,x,y);
synaptics_rmi4_f12_abs_report_me(false,x,y);
synaptics_rmi4_f12_abs_report_me(false,x,y);
synaptics_rmi4_f12_abs_report_me(false,x,y);
//手指离开屏幕（如果不设置，则表示为长时间触摸该位置）
synaptics_rmi4_f12_abs_report_me(true,x,y);
return;
}
//该代码作用为将该符号到处给其他驱动使用
EXPORT_SYMBOL(set_input_touch_click);
//该函数实现滑动触摸屏，为开始的位置到停止的位置，可以看到我都是分为9次移动过去，系统会通过判断时间等来判断点击和移动的。其中代码就不仔细分析了。
void set_input_touch_slide(int start_x,int start_y,int end_x,int end_y)
{
int tmp_x = 0;
int tmp_y = 0;
int zeyu_x = 0;
int zeyu_y = 0;
size_t i = 0;
if ((end_x == start_x) && (end_y == start_y)) {
return;
}
if ((end_x >= start_x) && (end_y >= start_y)) {
tmp_x = end_x - start_x;
tmp_y = end_y - start_y;
tmp_x = tmp_x / 9;
tmp_y = tmp_y / 9;
for (i = 0; i <= 9; i++)
{
zeyu_x = start_x + (tmp_x * i);
zeyu_y = start_y + (tmp_y * i);
if (i == 9) {
zeyu_x = end_x;
zeyu_y = end_y;
}
synaptics_rmi4_f12_abs_report_me(false,zeyu_x,zeyu_y);
}
synaptics_rmi4_f12_abs_report_me(true,0,0);
return;
}
if ((end_x >= start_x) && (end_y <= start_y)) {
tmp_x = end_x - start_x;
tmp_y = start_y - end_y;
tmp_x = tmp_x / 9;
tmp_y = tmp_y / 9;
for (i = 0; i <= 9; i++)
{
zeyu_x = start_x + (tmp_x * i);
zeyu_y = start_y - (tmp_y * i);
if (i == 9) {
zeyu_x = end_x;
zeyu_y = end_y;
}
synaptics_rmi4_f12_abs_report_me(false,zeyu_x,zeyu_y);
}
synaptics_rmi4_f12_abs_report_me(true,0,0);
return;
}
if ((end_x <= start_x) && (end_y >= start_y)) {
tmp_x = start_x - end_x;
tmp_y = end_y - start_y;
tmp_x = tmp_x / 9;
tmp_y = tmp_y / 9;
for (i = 0; i <= 9; i++)
{
zeyu_x = start_x - (tmp_x * i);
zeyu_y = start_y + (tmp_y * i);
if (i == 9) {
zeyu_x = end_x;
zeyu_y = end_y;
}
synaptics_rmi4_f12_abs_report_me(false,zeyu_x,zeyu_y);
}
synaptics_rmi4_f12_abs_report_me(true,0,0);
return;
}
if ((end_x <= start_x) && (end_y <= start_y)) {
tmp_x = start_x - end_x;
tmp_y = start_y - end_y;
tmp_x = tmp_x / 9;
tmp_y = tmp_y / 9;
for (i = 0; i <= 9; i++)
{
zeyu_x = start_x - (tmp_x * i);
zeyu_y = start_y - (tmp_y * i);
if (i == 9) {
zeyu_x = end_x;
zeyu_y = end_y;
}
synaptics_rmi4_f12_abs_report_me(false,zeyu_x,zeyu_y);
}
synaptics_rmi4_f12_abs_report_me(true,0,0);
return;
}
return;
}
EXPORT_SYMBOL(set_input_touch_slide);
