AM335x(TQ335x)学习笔记——触摸屏驱动编写

时间：11-28 来源：互联网点击：

g,sizeof(config))<0){
dev_err(dev,"FailedtoconfiguretheGT811,tryagain...");
status=-EINVAL;
}
else{
dev_info(dev,"Gt811configuesucceed");
status=0;
break;
}
}
returnstatus;
}
staticstructgt811_ts_platdata*gt811_ts_parse_devtree(structi2c_client*client)
{
structdevice*dev=&client->dev;
structdevice_node*node;
structgt811_ts_platdata*pdata;
enumof_gpio_flagsflags;
node=dev->of_node;
if(!node){
dev_err(dev,"Theof_nodeisNULL.");
returnERR_PTR(-ENODEV);
}
pdata=devm_kzalloc(dev,sizeof(structdevice_node),GFP_KERNEL);
if(!pdata){
dev_err(dev,"Noenoughmemoryleft.");
returnERR_PTR(-ENOMEM);
}
pdata->reset_pin=of_get_gpio_flags(node,0,&flags);
if(pdata->reset_pin<0){
dev_err(dev,"GetRSTpinfailed!");
returnERR_PTR(-EINVAL);
}
if(of_property_read_u32(node,"touchscreen-size-x",&pdata->size_x)){
dev_err(dev,"Failedtogetthetouchscreenxsize.");
returnERR_PTR(-EINVAL);
}
if(of_property_read_u32(node,"touchscreen-size-y",&pdata->size_y)){
dev_err(dev,"Failedtogetthetouchscreenysize.");
returnERR_PTR(-EINVAL);
}
if(of_property_read_u32(node,"touchscreen-size-p",&pdata->size_p)){
pdata->size_p=255;
}
if(of_property_read_u32(node,"touchscreen-swap",&pdata->swap)){
pdata->swap=1;
}
if(of_property_read_u32(node,"touchscreen-revert-x",&pdata->revert_x)){
pdata->revert_x=1;
}
if(of_property_read_u32(node,"touchscreen-revert-x",&pdata->revert_y)){
pdata->revert_y=1;
}
returnpdata;
}
staticintgt811_ts_probe(structi2c_client*client,conststructi2c_device_id*id)
{
structdevice*dev=&client->dev;
structgt811_ts_platdata*pdata=dev_get_platdata(dev);
structinput_dev*input;
interror=0;
if(!of_match_device(of_match_ptr(gt811_ts_of_match),dev)){
dev_err(dev,"Failedtomatch.");
return-EINVAL;
}
if(!pdata){
pdata=gt811_ts_parse_devtree(client);
if(IS_ERR(pdata)){
dev_err(dev,"Getdevicedatafromdevicetreefailed!");
error=-EINVAL;
gotofailed_exit;
}
}
pdata->client=client;
i2c_set_clientdata(client,pdata);
input=devm_input_allocate_device(dev);
if(!input){
dev_err(dev,"Failedtoallocateinputdevice");
error=-ENOMEM;
gotopdata_free;
}
pdata->input=input;
input->name=client->name;
input->id.bustype=BUS_I2C;
input->id.product=0xBEEF;
input->id.vendor=0xDEAD;
input->dev.parent=&client->dev;
__set_bit(EV_KEY,input->evbit);
__set_bit(EV_ABS,input->evbit);
__set_bit(BTN_TOUCH,input->keybit);
input_set_abs_params(input,ABS_X,0,pdata->size_x,0,0);
input_set_abs_params(input,ABS_Y,0,pdata->size_y,0,0);
input_set_abs_params(input,ABS_MT_POSITION_X,0,pdata->size_x,0,0);
input_set_abs_params(input,ABS_MT_POSITION_Y,0,pdata->size_y,0,0);
error=input_mt_init_slots(input,5,INPUT_MT_DIRECT|INPUT_MT_DROP_UNUSED);
if(error){
dev_err(dev,"Failedtoinitializethemulti-touchslots.");
gotoinput_free;
}
input_set_drvdata(input,pdata);
error=input_register_device(input);
if(error){
dev_err(dev,"Registerinputdevicefailed!");
gotoinput_free;
}
if(gt811_ts_initilize(client)){
dev_err(dev,"FailedtoinitializeGT811.");
}
INIT_WORK(&pdata->work,gt811_ts_handler);
error=devm_request_any_context_irq(dev,client->irq,gt811_ts_isr,
IRQF_TRIGGER_FALLING,client->name,pdata);
if(error){
dev_err(dev,"Failedtorequestirq(number:%d)",client->irq);
gotoinput_free;
}
return0;
input_free:
devm_kfree(dev,input);
pdata_free:
devm_kfree(dev,pdata);
failed_exit:
returnerror;
}
staticintgt811_ts_remove(structi2c_client*client)
{
structgt811_ts_platdata*pdata=(structgt811_ts_platdata*)i2c_get_clientdata(client);
devm_free_irq(&client->dev,client->irq,i2c_get_clientdata(client));
input_unregister_device(pdata->input);
devm_kfree(&client->dev,pdata);
return0;
}
staticconststructi2c_device_idgt811_ts_id[]={
{"gt811_ts",0},
{}
};
staticstructi2c_drivergt811_ts_driver={
.driver={
.owner=THIS_MODULE,
.name="gt811_ts",
.of_match_table=of_match_ptr(gt811_ts_of_match),
},
.probe=gt811_t

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