drivers/usb/core/hub.h

Source file repositories/reference/linux-study-clean/drivers/usb/core/hub.h

File Facts

System
Linux kernel
Corpus path
drivers/usb/core/hub.h
Extension
.h
Size
5844 bytes
Lines
186
Domain
Driver Families
Bucket
drivers/usb
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct usb_hub {
	struct device		*intfdev;	/* the "interface" device */
	struct usb_device	*hdev;
	struct kref		kref;
	struct urb		*urb;		/* for interrupt polling pipe */

	/* buffer for urb ... with extra space in case of babble */
	u8			(*buffer)[8];
	union {
		struct usb_hub_status	hub;
		struct usb_port_status	port;
	}			*status;	/* buffer for status reports */
	struct mutex		status_mutex;	/* for the status buffer */

	int			error;		/* last reported error */
	int			nerrors;	/* track consecutive errors */

	unsigned long		event_bits[1];	/* status change bitmask */
	unsigned long		change_bits[1];	/* ports with logical connect
							status change */
	unsigned long		removed_bits[1]; /* ports with a "removed"
							device present */
	unsigned long		wakeup_bits[1];	/* ports that have signaled
							remote wakeup */
	unsigned long		power_bits[1]; /* ports that are powered */
	unsigned long		child_usage_bits[1]; /* ports powered on for
							children */
	unsigned long		warm_reset_bits[1]; /* ports requesting warm
							reset recovery */
#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
#error event_bits[] is too short!
#endif

	struct usb_hub_descriptor *descriptor;	/* class descriptor */
	struct usb_tt		tt;		/* Transaction Translator */

	unsigned		mA_per_port;	/* current for each child */
#ifdef	CONFIG_PM
	unsigned		wakeup_enabled_descendants;
#endif

	unsigned		limited_power:1;
	unsigned		quiescing:1;
	unsigned		disconnected:1;
	unsigned		in_reset:1;
	unsigned		quirk_disable_autosuspend:1;

	unsigned		quirk_check_port_auto_suspend:1;

	unsigned		has_indicators:1;
	u8			indicator[USB_MAXCHILDREN];
	struct delayed_work	leds;
	struct delayed_work	init_work;
	struct delayed_work	post_resume_work;
	struct work_struct      events;
	spinlock_t		irq_urb_lock;
	struct timer_list	irq_urb_retry;
	struct usb_port		**ports;
	struct list_head        onboard_devs;
};

/**
 * struct usb port - kernel's representation of a usb port
 * @child: usb device attached to the port
 * @dev: generic device interface
 * @port_owner: port's owner
 * @peer: related usb2 and usb3 ports (share the same connector)
 * @connector: USB Type-C connector
 * @req: default pm qos request for hubs without port power control
 * @connect_type: port's connect type
 * @state: device state of the usb device attached to the port
 * @state_kn: kernfs_node of the sysfs attribute that accesses @state
 * @location: opaque representation of platform connector location
 * @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
 * @portnum: port index num based one
 * @is_superspeed cache super-speed status
 * @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
 * @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
 * @early_stop: whether port initialization will be stopped earlier.
 * @ignore_event: whether events of the port are ignored.
 */
struct usb_port {
	struct usb_device *child;
	struct device dev;
	struct usb_dev_state *port_owner;
	struct usb_port *peer;
	struct typec_connector *connector;
	struct dev_pm_qos_request *req;
	enum usb_port_connect_type connect_type;
	enum usb_device_state state;

Annotation

Implementation Notes