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/* * This file holds USB constants and structures that are needed for * USB device APIs. These are used by the USB device model, which is * defined in chapter 9 of the USB 2.0 specification and in the * Wireless USB 1.0 (spread around). Linux has several APIs in C that * need these: * * - the master/host side Linux-USB kernel driver API; * - the "usbfs" user space API; and * - the Linux "gadget" slave/device/peripheral side driver API. * * USB 2.0 adds an additional "On The Go" (OTG) mode, which lets systems * act either as a USB master/host or as a USB slave/device. That means * the master and slave side APIs benefit from working well together. * * There's also "Wireless USB", using low power short range radios for * peripheral interconnection but otherwise building on the USB framework. * * Note all descriptors are declared '__attribute__((packed))' so that: * * [a] they never get padded, either internally (USB spec writers * probably handled that) or externally; * * [b] so that accessing bigger-than-a-bytes fields will never * generate bus errors on any platform, even when the location of * its descriptor inside a bundle isn't "naturally aligned", and * * [c] for consistency, removing all doubt even when it appears to * someone that the two other points are non-issues for that * particular descriptor type. */ #ifndef __LINUX_USB_CH9_H #define __LINUX_USB_CH9_H #include <uapi/linux/usb/ch9.h> /** * usb_speed_string() - Returns human readable-name of the speed. * @speed: The speed to return human-readable name for. If it's not * any of the speeds defined in usb_device_speed enum, string for * USB_SPEED_UNKNOWN will be returned. */ extern const char *usb_speed_string(enum usb_device_speed speed); /** * usb_state_string - Returns human readable name for the state. * @state: The state to return a human-readable name for. If it's not * any of the states devices in usb_device_state_string enum, * the string UNKNOWN will be returned. */ extern const char *usb_state_string(enum usb_device_state state); #endif /* __LINUX_USB_CH9_H */