Add empty stub of gpio_device_get_label() when GPIOLIB is not enabled. Cc: <stable@vger.kernel.org> Fixes:d1f7728("gpiolib: provide gpio_device_get_label()") Suggested-by: kernel test robot <lkp@intel.com> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off...
* gpio_device_get_label() - Get the label of this GPIO device * @gdev: GPIO device * * Returns: * Pointer to the string containing the GPIO device label. The string's * lifetime is tied to that of the underlying GPIO device. ...
Window,WindowCoveringorDoorcontrols 2 GPIO outputs plugged to a remote control. When operating, the GPIO is turned on for 200ms to simulate a button pression on the remote control. Configuration GarageDoorOpener GarageDoorOpenercontrols 1 or 2 GPIO output(s) plugged to a garage door engine. Wh...
struct gpio_chip { const char *label; struct gpio_device *gpiodev; struct device *parent; struct module *owner; int (*request)(struct gpio_chip *chip, unsigned offset); void (*free)(struct gpio_chip *chip, unsigned offset); int (*get_direction)(struct gpio_chip *chip, unsigned offset...
led-gpio = ; /* Bit 0 express polarity */ #define GPIO_ACTIVE_HIGH 0 #define GPIO_ACTIVE_LOW 1 所以是GPIO_ACTIVE_HIGH PCB上低电平点亮,高定平熄灭 if(sta==LEDON){ gpio_set_value(led_dev.led_no,0); //0无效低电平点亮 }else if(sta==LEDOFF){ ...
针对你遇到的问题“gpioget: error reading gpio values: device or resource busy”,以下是一些解决步骤和建议: 确认GPIO设备或资源状态: 使用gpioinfo命令查看GPIO设备的当前状态,确认你尝试访问的GPIO编号是否存在且未被配置为其他功能。 检查是否有其他进程占用GPIO: 使用lsof或fuser命令来检查是否有其他进程正在...
通过调试串口或者ADB进入系统,执行getevent -l命令测试GPIO按键,命令如下: 130|console:/ # getevent -l add device 1: /dev/input/event3 name: "gpio_keys" add device 2: /dev/input/event1 name: "rk805 pwrkey" add device 3: /dev/input/event2 ...
通过配置CONFIG_GPIO_SYSFS 选项,可以将gpio 导出到用户节点/sys/class/gpio 下,对该节点下的文件操作,可以控制gpio 输入输出。 Symbol: GPIO_SYSFS [=y] Type : boolean Prompt: /sys/class/gpio/... (sysfs interface) Location: -> Device Drivers ...
static int firefly_gpio_probe(struct platform_device *pdev) { int ret; int gpio; enum of_gpio_flags flag; struct firefly_gpio_info *gpio_info; struct device_node *firefly_gpio_node = pdev->dev.of_node; //用于接收传入的设备树结点 printk("Firefly GPIO Test Program Probe\n"); //1、申...
GPIO_CLX_ProcessAddDevicePreDeviceCreate 方法将初始化信息加载到作为输入参数传递给 WdfDeviceCreate 方法的两个结构中。 语法 C++ 复制 NTSTATUS GPIO_CLX_ProcessAddDevicePreDeviceCreate( [in] WDFDRIVER Driver, [in, out] PWDFDEVICE_INIT DeviceInit, [out] PWDF_OBJECT_ATTRIBUTES FdoAttributes ...