最終更新:2014-05-26 (月) 14:26:05 (3617d)  

usb_bus
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struct usb_bus {
        struct device *controller;      /* host/master side hardware */
        int busnum;                     /* Bus number (in order of reg) */
        const char *bus_name;           /* stable id (PCI slot_name etc) */
        u8 uses_dma;                    /* Does the host controller use DMA? */
        u8 uses_pio_for_control;        /*
                                         * Does the host controller use PIO
                                         * for control transfers?
                                         */
        u8 otg_port;                    /* 0, or number of OTG/HNP port */
        unsigned is_b_host:1;           /* true during some HNP roleswitches */
        unsigned b_hnp_enable:1;        /* OTG: did A-Host enable HNP? */
        unsigned no_stop_on_short:1;    /*
                                         * Quirk: some controllers don't stop
                                         * the ep queue on a short transfer
                                         * with the URB_SHORT_NOT_OK flag set.
                                         */
        unsigned no_sg_constraint:1;    /* no sg constraint */
        unsigned sg_tablesize;          /* 0 or largest number of sg list entries */

        int devnum_next;                /* Next open device number in
                                         * round-robin allocation */

        struct usb_devmap devmap;       /* device address allocation map */
        struct usb_device *root_hub;    /* Root hub */
        struct usb_bus *hs_companion;   /* Companion EHCI bus, if any */
        struct list_head bus_list;      /* list of busses */

        int bandwidth_allocated;        /* on this bus: how much of the time
                                         * reserved for periodic (intr/iso)
                                         * requests is used, on average?
                                         * Units: microseconds/frame.
                                         * Limits: Full/low speed reserve 90%,
                                         * while high speed reserves 80%.
                                         */
        int bandwidth_int_reqs;         /* number of Interrupt requests */
        int bandwidth_isoc_reqs;        /* number of Isoc. requests */

        unsigned resuming_ports;        /* bit array: resuming root-hub ports */

#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
        struct mon_bus *mon_bus;        /* non-null when associated */
        int monitored;                  /* non-zero when monitored */
#endif
};

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