AM335x(TQ335x)學習筆記——觸摸屏驅動編寫
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時間：2016-11-28
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if(status){returnstatus;}count=3;while(count--){if(i2c_write_bytes(client,config,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_ts_probe,.remove=gt811_ts_remove,.id_table=gt811_ts_id,};module_i2c_driver(gt811_ts_driver);MODULE_AUTHOR("girlkoo");MODULE_DESCRIPTION("Gt811I2CTouchscreenDriver");MODULE_LICENSE("GPL"); (4) 使用tslib工具測試本文引用地址：http://www.ex-cimer.com/article/201611/322822.htmtslib的編譯方法請參考本博客的另一片文章，鏈接如下：
S5PV210(TQ210)學習筆記——觸摸屏驅動編寫
本文就不再重復tslib的配置方法。
(5)效果展示
(6) 完整驅動代碼
請到本人的資源中下載TQ335x的觸摸屏驅動源碼，鏈接如下：
http://download.csdn.net/download/girlkoo/8202177
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