OrangePi Zero 3学习笔记（Android篇）7 - ftdi_sio

目录

1. 内核配置

2. SPI设备

3. 验证

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这部分需要基于之前修改的ftdi_sio驱动，增加MPSSE部分的代码。

1. 内核配置

一般默认USB转串口是关闭的，所以需要配置打开。在源代码根目录下执行：

./longan/build.sh menuconfig

菜单进入顺序：

Device Drivers -> USB support -> USB Serial Converter support

勾选下面的选项：

USB Serial Console device support

USB Generic Serial Driver  

USB FTDI Single Port Serial Driver

保存退出重新编译Linux内核。

在device/softwinner/apollo/common/system/init.sun50iw9p1.rc中找到on post-fs-data，添加chmod 0666 /dev/ttyUSB*

2. SPI设备

如果是增加MPSSE SPI的版本，由于Linux上是通过spidev_spi_ids创建SPI设备的，而Android上没有这部分，如果不想修改ftdi_sio这部分代码，就需要添加spidev的修改代码。

先找到文件longan/kernel/linux-5.4/drivers/spi/spidev.c，在“static struct class *spidev_class;”后面添加：

static const struct spi_device_id spidev_spi_ids[] = {{ .name = "dh2228fv" },{},
};
MODULE_DEVICE_TABLE(spi, spidev_spi_ids);

 然后在spidev_spi_driver添加.id_table =    spidev_spi_ids,：

static struct spi_driver spidev_spi_driver = {.driver = {.name =		"spidev",.of_match_table = of_match_ptr(spidev_dt_ids),.acpi_match_table = ACPI_PTR(spidev_acpi_ids),},.probe =	spidev_probe,.remove =	spidev_remove,.id_table =	spidev_spi_ids,/* NOTE:  suspend/resume methods are not necessary here.* We don't do anything except pass the requests to/from* the underlying controller.  The refrigerator handles* most issues; the controller driver handles the rest.*/
};

3. 验证

console:/ $ ls dev/ttyUSB*
dev/ttyUSB0  dev/ttyUSB1  dev/ttyUSB2  dev/ttyUSB3
console:/ $ ls dev/i2c*
dev/i2c-0  dev/i2c-1  dev/i2c-2  dev/i2c-3  dev/i2c-4  dev/i2c-5
console:/ $ ls dev/spi*
dev/spidev0.0  dev/spidev2.1  dev/spidev2.4  dev/spidev3.2
dev/spidev1.1  dev/spidev2.2  dev/spidev3.0  dev/spidev3.3
dev/spidev2.0  dev/spidev2.3  dev/spidev3.1  dev/spidev3.4