qemu：gpio使用

定义gpio_in

qdev_init_gpio_in_named
qdev_get_gpio_in_named

定义

/*** qdev_init_gpio_in_named() - create an array of input GPIO lines* @dev: device to add array to* @handler: a &typedef qemu_irq_handler function to call when GPIO is set* @name: Name of the GPIO input (must be unique for this device)* @n: Number of GPIO lines in this input set** Like qdev_init_gpio_in_named_with_opaque(), but the opaque pointer* passed to the handler is @dev (which is the most commonly desired behaviour).*/
static inline void qdev_init_gpio_in_named(DeviceState *dev,qemu_irq_handler handler,const char *name, int n)

使用

qdev_init_gpio_in_named(DEVICE(obj), FUNCTION_PROCESS_GPIO_PIN_IN(3,11), "gpio_pin_in_3_11", 1);DEVICE(obj)：
FUNCTION_PROCESS_GPIO_PIN_IN(3,11)：handler函数
"gpio_pin_in_3_11"：引脚名称
1：此引脚线个数

验证

进入到monitor模式 telnet 127.0.0.1 12345
查看设备信息 info qtree

  dev: dev01, id ""gpio-in "gpio_pin_in_4_25" 1gpio-in "gpio_pin_in_4_24" 1gpio-in "gpio_pin_in_3_20" 1gpio-in "gpio_pin_in_3_11" 1mmio 0000000025040000/0000000000010000

定义gpio_out

结构体添加irq

typedef struct  {SysBusDevice parent_obj;MemoryRegion iomem;qemu_irq irq_out[32];
} ;

初始化irq

sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq_out[i]);

定义

/*** qdev_init_gpio_out_named: create an array of named output GPIO lines* @dev: Device to create output GPIOs for* @pins: Pointer to qemu_irq or qemu_irq array for the GPIO lines* @name: Name to give this array of GPIO lines* @n: Number of GPIO lines to create** Like qdev_init_gpio_out(), but creates an array of GPIO output lines* with a name. Code using the device can then connect these GPIO lines* using qdev_connect_gpio_out_named().*/
void qdev_init_gpio_out_named(DeviceState *dev, qemu_irq *pins,const char *name, int n);

使用

qdev_init_gpio_out_named(dev, &s->irq_out[11], "gpio_pinout_3_11", 1);

将gpio_in与gpio_out联合起来

定义

/*** qdev_connect_gpio_out_named: Connect one of a device's named output*                              GPIO lines* @dev: Device whose GPIO to connect* @name: Name of the output GPIO array* @n: Number of the anonymous output GPIO line (which must be in range)* @input_pin: qemu_irq to connect the output line to** For anonymous output GPIO lines, use qdev_connect_gpio_out().*/
void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n,qemu_irq input_pin);

使用

qdev_connect_gpio_out_named(gpio_out_dev, "gpio_pinout_3_11", 0, qdev_get_gpio_in_named(gpio_in_dev, "gpio_pin_in_3_11", 0));gpio_out_dev：gpio线输出的设备，对接irq
"gpio_pinout_3_11"：gpio线输出线的名字
0：gpio线输出线的indexgpio_in_dev：gpio线输入的设备，对接handler函数
"gpio_pin_in_3_11"：gpio线输入线的名字
0：gpio线输入线的index