1.2 首先调用函数spi_alloc_device,分配一个spi_device,并通过device_initialize初始化。 1 struct spi_device *spi_alloc_device(struct spi_master *master) 2{ 3 struct spi_device *spi; 4 struct device *dev = master->dev.parent; 5
SPI主设备的注册可以在平台设备的probe函数中执行,可以使用spi_register_master函数进行注册。在注册SPI主设备时,需要先通过platform_get_resource函数获取到一个指向设备树节点的指针,再从该指针中读取设备节点的属性。 “` static int spi_probe(struct platform_device *pdev) { struct resource *res; struct spi_m...
1.1 spi设备的添加spi_new_device structspi_device*spi_new_device(structspi_master*master,structspi_board_info*chip){structspi_device*proxy;intstatus;/* NOTE: caller did any chip->bus_num checks necessary.** Also, unless we change the return value convention to use* error-or-pointer (not N...
int (*remove)(struct device *dev); void (*shutdown)(struct device *dev); int (*suspend)(struct device *dev, pm_message_t state); int (*resume)(struct device *dev); const struct dev_pm_ops *pm; struct subsys_private *p; }; struct bus_type spi_bus_type = { .name = "spi", ...
1、struct spi_statistics 2、struct spi_delay 3、struct spi_device 4、struct spi_driver 5、struct spi_controller 6、struct spi_res 7、struct spi_transfer 8、struct spi_message 9、struct spi_board_info 四、SPI框架的常用API总结 五、SPI驱动实例分析 (5-1)SPI主机侧驱动 (5-2)SPI设备侧驱动 六...
下面是一个简单的linux SPI驱动示例代码: #include #include #include #define DRV_NAME "example_spi_driver" static int example_readwrite(struct spi_device *spi, u8 data_in, u8 *data_out) { int ret; struct spi_transfer t[2]; struct spi_message m; ...
struct spi_device 从机设备板卡信息 struct i2c_board_info struct spi_board_info 从机设备驱动 struct i2c_driver struct spi_driver 一次完整的数据包 struct i2c_msg struct spi_transfer 多个完整数据包的封装 无 struct spi_message 源码分析 由于子系统架构与I2C等总线类似,所以不会在一些重复部分展开,具体...
这样的驱动通常在linux看来是一个协议驱动,比如spi flash,负责和MTD系统打交道;比如触摸传感器,需要和input子系统打交道,再比如spi接口的OLED模块。 这样的设备使用的【接口】在驱动中使用struct spi_deivce表示 structspi_device{structdevicedev;structspi_controller*controller;structspi_controller*master;/* compatibi...
以下是一个简单的SPI驱动示例: 代码语言:txt 复制 #include <linux/module.h> #include <linux/spi/spidev.h> #include <linux/fs.h> static struct spi_device *spi_dev; static int spi_open(struct inode *inode, struct file *file) { return 0; } static ssize_t spi_read(struct file *file,...