include/linux/usb/xhci-sideband.h

Source file repositories/reference/linux-study-clean/include/linux/usb/xhci-sideband.h

File Facts

System
Linux kernel
Corpus path
include/linux/usb/xhci-sideband.h
Extension
.h
Size
3394 bytes
Lines
112
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct xhci_sideband_event {
	enum xhci_sideband_notify_type type;
	void *evt_data;
};

/**
 * struct xhci_sideband - representation of a sideband accessed usb device.
 * @xhci: The xhci host controller the usb device is connected to
 * @vdev: the usb device accessed via sideband
 * @eps: array of endpoints controlled via sideband
 * @ir: event handling and buffer for sideband accessed device
 * @type: xHCI sideband type
 * @mutex: mutex for sideband operations
 * @intf: USB sideband client interface
 * @notify_client: callback for xHCI sideband sequences
 *
 * FIXME usb device accessed via sideband Keeping track of sideband accessed usb devices.
 */
struct xhci_sideband {
	struct xhci_hcd                 *xhci;
	struct xhci_virt_device         *vdev;
	struct xhci_virt_ep             *eps[EP_CTX_PER_DEV];
	struct xhci_interrupter         *ir;
	enum xhci_sideband_type		type;

	/* Synchronizing xHCI sideband operations with client drivers operations */
	struct mutex			mutex;

	struct usb_interface		*intf;
	int (*notify_client)(struct usb_interface *intf,
			     struct xhci_sideband_event *evt);
};

struct xhci_sideband *
xhci_sideband_register(struct usb_interface *intf, enum xhci_sideband_type type,
		       int (*notify_client)(struct usb_interface *intf,
				    struct xhci_sideband_event *evt));
void
xhci_sideband_unregister(struct xhci_sideband *sb);
int
xhci_sideband_add_endpoint(struct xhci_sideband *sb,
			   struct usb_host_endpoint *host_ep);
int
xhci_sideband_remove_endpoint(struct xhci_sideband *sb,
			      struct usb_host_endpoint *host_ep);
int
xhci_sideband_stop_endpoint(struct xhci_sideband *sb,
			    struct usb_host_endpoint *host_ep);
struct sg_table *
xhci_sideband_get_endpoint_buffer(struct xhci_sideband *sb,
				  struct usb_host_endpoint *host_ep);
struct sg_table *
xhci_sideband_get_event_buffer(struct xhci_sideband *sb);

#if IS_ENABLED(CONFIG_USB_XHCI_SIDEBAND)
bool xhci_sideband_check(struct usb_hcd *hcd);
#else
static inline bool xhci_sideband_check(struct usb_hcd *hcd)
{ return false; }
#endif /* IS_ENABLED(CONFIG_USB_XHCI_SIDEBAND) */

int
xhci_sideband_create_interrupter(struct xhci_sideband *sb, int num_seg,
				 bool ip_autoclear, u32 imod_interval, int intr_num);
void
xhci_sideband_remove_interrupter(struct xhci_sideband *sb);
int
xhci_sideband_interrupter_id(struct xhci_sideband *sb);

#if IS_ENABLED(CONFIG_USB_XHCI_SIDEBAND)
void xhci_sideband_notify_ep_ring_free(struct xhci_sideband *sb,
				       unsigned int ep_index);
#else
static inline void xhci_sideband_notify_ep_ring_free(struct xhci_sideband *sb,
						     unsigned int ep_index)
{ }
#endif /* IS_ENABLED(CONFIG_USB_XHCI_SIDEBAND) */
#endif /* __LINUX_XHCI_SIDEBAND_H */

Annotation

Implementation Notes