-[Add the touchscreen driver-related descriptions.](#section18249155619195)
-[Board-level Hardware Configuration and Private Data Configuration](#section3571192072014)
-[Adding the Touchscreen Driver-related Description](#section18249155619195)
-[Adding Board Configuration and Touchscreen Private Configuration](#section3571192072014)
-[Adding the Touchscreen Driver](#section6356758162015)
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@@ -13,7 +13,7 @@
-**Functions of the Touchscreen driver**
The Touchscreen driver is used to power on its integrated circuit \(IC\), configure and initialize hardware pins, register interrupts, configure Inter-Integrated Circuit \(I2C\) or SPI APIs, set input-related configurations, and download and update firmware.
The touchscreen driver is used to power on its integrated circuit \(IC\), configure and initialize hardware pins, register interrupts, configure Inter-Integrated Circuit \(I2C\) or SPI APIs, set input-related configurations, and download and update firmware.
-**Layers of the Touchscreen driver**
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@@ -80,17 +80,18 @@ Regardless of the OS and system on a chip \(SoC\), the input driver is developed
The following uses the touchscreen driver as an example to describe the loading process of the input driver model:
\(1\) Complete the device description configuration, such as the loading priority, board-level hardware information, and private data, by referring to the existing template.
1. Complete the device description configuration, such as the loading priority, board-level hardware information, and private data, by referring to the existing template.
\(2\) Load the input device management driver. The input management driver is loaded automatically by the HDF to create and initialize the device manager.
2. Load the input device management driver. The input management driver is loaded automatically by the HDF to create and initialize the device manager.
\(3\) Load the platform driver. The platform driver is loaded automatically by the HDF to parse the board-level configuration, initialize the hardware, and provide the API for registering the touchscreen.
3. Load the platform driver. The platform driver is loaded automatically by the HDF to parse the board-level configuration, initialize the hardware, and provide the API for registering the touchscreen.
\(4\) Load the touchscreen driver. The touchscreen driver is loaded automatically by the HDF to instantiate the touchscreen device, parse the private data, and implement differentiated APIs provided by the platform.
4. Load the touchscreen driver. The touchscreen driver is loaded automatically by the HDF to instantiate the touchscreen device, parse the private data, and implement differentiated APIs provided by the platform.
\(5\) Register the instantiated touchscreen device with the platform driver. Then bind this device to the platform driver, and complete touchscreen initialization such as interrupt registration and power-on and power-off.
5. Register the instantiated touchscreen device with the platform driver. Then bind this device to the platform driver, and complete touchscreen initialization such as interrupt registration and power-on and power-off.
6. Instantiate the input device and register it with the input manager after the touchscreen is initialized.
\(6\) Instantiate the input device and register it with the input manager after the touchscreen is initialized.
Perform the following steps:
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This example describes how to develop the touchscreen driver.
### Add the touchscreen driver-related descriptions.<a name="section18249155619195"></a>
### Adding the Touchscreen Driver-related Description<a name="section18249155619195"></a>
The information about modules of the input driver model is shown as follows and enables the HDF to load the modules in sequence. For details, see [Driver Development](driver-hdf-development.md).
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}
```
### Board-level Hardware Configuration and Private Data Configuration<a name="section3571192072014"></a>
### Adding Board Configuration and Touchscreen Private Configuration<a name="section3571192072014"></a>
The following describes the configuration of the board-level hardware and private data of the touchscreen. You can modify the configuration based on service requirements.
