linux 触摸屏驱动编写

方块块 發表於 2023-6-10 00:00:00

<p>
早在诺基亚手机还比较流行的时候，那时候触摸屏用的还不多。但是随着触摸屏手机、即智能手机的流行，触摸屏基本成了手机的标配。所以，今天可以看看触摸屏驱动在linux上是如何进行的。</p>
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1、驱动目录</p>
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<code class="plain plain">drivers/input</code>
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2、看看这个目录的Makefile如何设计</p>
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<code class="plain plain">obj-$(CONFIG_INPUT)   += input-core.o </code>
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<code class="plain plain">input-core-y := input.o input-compat.o input-mt.o ff-core.o </code>
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<code class="plain spaces"> </code>
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<code class="plain plain">obj-$(CONFIG_INPUT_TOUCHSCREEN) += touchscreen/</code>
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3、除了input-core.o这个文件外，只需要看touchscreen目录就可以了</p>
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<code class="plain plain">config TOUCHSCREEN_S3C2410 </code>
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<code class="plain spaces">  </code><code class="plain plain">tristate "Samsung S3C2410/generic touchscreen input driver" </code>
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<code class="plain spaces">  </code><code class="plain plain">depends on ARCH_S3C24XX || SAMSUNG_DEV_TS </code>
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<code class="plain spaces">  </code><code class="plain plain">depends on S3C_ADC </code>
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<code class="plain spaces">  </code><code class="plain plain">help </code>
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<code class="plain spaces">   </code><code class="plain plain">Say Y here if you have the s3c2410 touchscreen. </code>
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<code class="plain spaces"> </code>
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<code class="plain spaces">   </code><code class="plain plain">If unsure, say N. </code>
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<code class="plain spaces"> </code>
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<code class="plain spaces">   </code><code class="plain plain">To compile this driver as a module, choose M here: the </code>
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<code class="plain spaces">   </code><code class="plain plain">module will be called s3c2410_ts.</code>
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4、看懂了Kconfig之后，再阅读Makefile，注意S3C_ADC宏可以参考arch/arm/plat-samsung/adc.c</p>
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<code class="plain plain">obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o</code>
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5、继续阅读s3c2410_ts.c文件</p>
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<code class="cpp keyword bold">static</code> <code class="cpp keyword bold">const</code> <code class="cpp keyword bold">struct</code> <code class="cpp plain">platform_device_id s3cts_driver_ids[] = { </code>
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<code class="cpp spaces">  </code><code class="cpp plain">{ </code><code class="cpp string">"s3c2410-ts"</code><code class="cpp plain">, 0 }, </code>
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<code class="cpp spaces">  </code><code class="cpp plain">{ </code><code class="cpp string">"s3c2440-ts"</code><code class="cpp plain">, 0 }, </code>
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<code class="cpp spaces">  </code><code class="cpp plain">{ </code><code class="cpp string">"s3c64xx-ts"</code><code class="cpp plain">, FEAT_PEN_IRQ }, </code>
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<code class="cpp spaces">  </code><code class="cpp plain">{ } </code>
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<code class="cpp plain">}; </code>
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<code class="cpp plain">MODULE_DEVICE_TABLE(platform, s3cts_driver_ids); </code>
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<code class="cpp spaces"> </code>
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<code class="cpp keyword bold">static</code> <code class="cpp keyword bold">struct</code> <code class="cpp plain">platform_driver s3c_ts_driver = { </code>
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<code class="cpp spaces">  </code><code class="cpp plain">.driver     = { </code>
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<code class="cpp spaces">    </code><code class="cpp plain">.name = </code><code class="cpp string">"samsung-ts"</code><code class="cpp plain">, </code>
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<code class="cpp preprocessor">#ifdef CONFIG_PM </code>
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<code class="cpp spaces">    </code><code class="cpp plain">.pm = &s3c_ts_pmops, </code>
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<code class="cpp preprocessor">#endif </code>
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<code class="cpp spaces">  </code><code class="cpp plain">}, </code>
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<code class="cpp spaces">  </code><code class="cpp plain">.id_table = s3cts_driver_ids, </code>
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<code class="cpp spaces">  </code><code class="cpp plain">.probe   = s3c2410ts_probe, </code>
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<code class="cpp spaces">  </code><code class="cpp plain">.</code><code class="cpp functions bold">remove</code>   <code class="cpp plain">= s3c2410ts_remove, </code>
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<code class="cpp plain">}; </code>
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<code class="cpp plain">module_platform_driver(s3c_ts_driver); </code>
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6、根据probe函数，看看有什么需要注意的内容</p>
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<code class="cpp plain">ts.client = s3c_adc_register(pdev, s3c24xx_ts_select, </code>
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<code class="cpp spaces">         </code><code class="cpp plain">s3c24xx_ts_conversion, 1); </code>
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<code class="cpp keyword bold">if</code> <code class="cpp plain">(IS_ERR(ts.client)) { </code>
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<code class="cpp spaces">  </code><code class="cpp plain">dev_err(dev, </code><code class="cpp string">"failed to register adc client\n"</code><code class="cpp plain">); </code>
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<code class="cpp spaces">  </code><code class="cpp plain">ret = PTR_ERR(ts.client); </code>
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<code class="cpp spaces">  </code><code class="cpp keyword bold">goto</code> <code class="cpp plain">err_iomap; </code>
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<code class="cpp plain">}</code>
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7、接着，查看是否有中断函数被注册</p>
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<code class="cpp plain">ret = request_irq(ts.irq_tc, stylus_irq, 0, </code>
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<code class="cpp spaces">     </code><code class="cpp string">"s3c2410_ts_pen"</code><code class="cpp plain">, ts.input);</code>
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8、最后</p>
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很明显，触摸屏驱动本质上还是由TOUCHSCREEN_S3C2410和S3C_ADC两个macro一起完成的。</p>
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。</p>
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原文链接：https://blog.csdn.net/feixiaoxing/article/details/79885954</p>

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linux 触摸屏驱动编写