uio_interrupt / user space interrupt

最新推荐文章于 2024-05-13 01:46:35 发布

原创最新推荐文章于 2024-05-13 01:46:35 发布 · 316 阅读

CC 4.0 BY-SA版权

本文深入探讨了UIO设备与UIO框架之间的交互机制，详细介绍了UIO设备的能力结构，包括设备信息、内存映射、中断处理等功能，并通过结构体定义展示了如何在特定UIO内核驱动中实现这些功能。

TO BE DONE

//drivers/uio
//###################################
//       uio framework
//-----------------------------------
//  uio based specific driver
//###################################

//==================================================================================
// the uio base specific driver just need to implement the uio_info infra-structure.
// so the struct uio-info is the interface that uio framework exposes to the specific
// uio based kernel driver.
//===================================================================================

//[uio_device]+---->[uio_info]

struct uio_device {
        struct module           *owner;
        struct device           *dev;
        int                     minor;
        atomic_t                event;
        struct fasync_struct    *async_queue;
        wait_queue_head_t       wait;
        int                     vma_count;
        struct uio_info         *info;
        struct kobject          *map_dir;
        struct kobject          *portio_dir;
};

/**
 * struct uio_info - UIO device capabilities
 * @uio_dev:            the UIO device this info belongs to
 * @name:               device name
 * @version:            device driver version
 * @mem:                list of mappable memory regions, size==0 for end of list
 * @port:               list of port regions, size==0 for end of list
 * @irq:                interrupt number or UIO_IRQ_CUSTOM
 * @irq_flags:          flags for request_irq()
 * @priv:               optional private data
 * @handler:            the device's irq handler
 * @mmap:               mmap operation for this uio device
 * @open:               open operation for this uio device
 * @release:            release operation for this uio device
 * @irqcontrol:         disable/enable irqs when 0/1 is written to /dev/uioX
 */
struct uio_info {
        struct uio_device       *uio_dev;
        const char              *name;
        const char              *version;
        struct uio_mem          mem[MAX_UIO_MAPS];
        struct uio_port         port[MAX_UIO_PORT_REGIONS];
        long                    irq;
        unsigned long           irq_flags;
        void                    *priv;
        irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
        int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
        int (*open)(struct uio_info *info, struct inode *inode);
        int (*release)(struct uio_info *info, struct inode *inode);
        int (*irqcontrol)(struct uio_info *info, s32 irq_on);
};

[ref] uio-howto.pdf