include/linux/usb/ch11.h

/*
 * This file holds Hub protocol constants and data structures that are
 * defined in chapter 11 (Hub Specification) of the USB 2.0 specification.
 *
 * It is used/shared between the USB core, the HCDs and couple of other USB
 * drivers.
 */

#ifndef __LINUX_HUB_H
#define __LINUX_HUB_H

#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/compiler.h>	/* likely()/unlikely() */

/*
 * Hub request types
 */

#define USB_RT_HUB	(USB_TYPE_CLASS | USB_RECIP_DEVICE)
#define USB_RT_PORT	(USB_TYPE_CLASS | USB_RECIP_OTHER)

/*
 * Hub class requests
 * See USB 2.0 spec Table 11-16
 */
#define HUB_CLEAR_TT_BUFFER	8
#define HUB_RESET_TT		9
#define HUB_GET_TT_STATE	10
#define HUB_STOP_TT		11

/*
 * Hub Class feature numbers
 * See USB 2.0 spec Table 11-17
 */
#define C_HUB_LOCAL_POWER	0
#define C_HUB_OVER_CURRENT	1

/*
 * Port feature numbers
 * See USB 2.0 spec Table 11-17
 */
#define USB_PORT_FEAT_CONNECTION	0
#define USB_PORT_FEAT_ENABLE		1
#define USB_PORT_FEAT_SUSPEND		2	/* L2 suspend */
#define USB_PORT_FEAT_OVER_CURRENT	3
#define USB_PORT_FEAT_RESET		4
#define USB_PORT_FEAT_L1		5	/* L1 suspend */
#define USB_PORT_FEAT_POWER		8
#define USB_PORT_FEAT_LOWSPEED		9	/* Should never be used */
#define USB_PORT_FEAT_C_CONNECTION	16
#define USB_PORT_FEAT_C_ENABLE		17
#define USB_PORT_FEAT_C_SUSPEND		18
#define USB_PORT_FEAT_C_OVER_CURRENT	19
#define USB_PORT_FEAT_C_RESET		20
#define USB_PORT_FEAT_TEST              21
#define USB_PORT_FEAT_INDICATOR         22
#define USB_PORT_FEAT_C_PORT_L1         23

/*
 * Hub Status and Hub Change results
 * See USB 2.0 spec Table 11-19 and Table 11-20
 */
struct usb_port_status {
	__le16 wPortStatus;
	__le16 wPortChange;
} __attribute__ ((packed));

/*
 * wPortStatus bit field
 * See USB 2.0 spec Table 11-21
 */
#define USB_PORT_STAT_CONNECTION	0x0001
#define USB_PORT_STAT_ENABLE		0x0002
#define USB_PORT_STAT_SUSPEND		0x0004
#define USB_PORT_STAT_OVERCURRENT	0x0008
#define USB_PORT_STAT_RESET		0x0010
#define USB_PORT_STAT_L1		0x0020
/* bits 6 to 7 are reserved */
#define USB_PORT_STAT_POWER		0x0100
#define USB_PORT_STAT_LOW_SPEED		0x0200
#define USB_PORT_STAT_HIGH_SPEED        0x0400
#define USB_PORT_STAT_TEST              0x0800
#define USB_PORT_STAT_INDICATOR         0x1000
/* bits 13 to 15 are reserved */
#define USB_PORT_STAT_SUPER_SPEED	0x8000	/* Linux-internal */

/*
 * wPortChange bit field
 * See USB 2.0 spec Table 11-22
 * Bits 0 to 4 shown, bits 5 to 15 are reserved
 */
#define USB_PORT_STAT_C_CONNECTION	0x0001
#define USB_PORT_STAT_C_ENABLE		0x0002
#define USB_PORT_STAT_C_SUSPEND		0x0004
#define USB_PORT_STAT_C_OVERCURRENT	0x0008
#define USB_PORT_STAT_C_RESET		0x0010
#define USB_PORT_STAT_C_L1		0x0020

/*
 * wHubCharacteristics (masks)
 * See USB 2.0 spec Table 11-13, offset 3
 */
#define HUB_CHAR_LPSM		0x0003 /* D1 .. D0 */
#define HUB_CHAR_COMPOUND	0x0004 /* D2       */
#define HUB_CHAR_OCPM		0x0018 /* D4 .. D3 */
#define HUB_CHAR_TTTT           0x0060 /* D6 .. D5 */
#define HUB_CHAR_PORTIND        0x0080 /* D7       */

struct usb_hub_status {
	__le16 wHubStatus;
	__le16 wHubChange;
} __attribute__ ((packed));

/*
 * Hub Status & Hub Change bit masks
 * See USB 2.0 spec Table 11-19 and Table 11-20
 * Bits 0 and 1 for wHubStatus and wHubChange
 * Bits 2 to 15 are reserved for both
 */
#define HUB_STATUS_LOCAL_POWER	0x0001
#define HUB_STATUS_OVERCURRENT	0x0002
#define HUB_CHANGE_LOCAL_POWER	0x0001
#define HUB_CHANGE_OVERCURRENT	0x0002


/*
 * Hub descriptor
 * See USB 2.0 spec Table 11-13
 */

#define USB_DT_HUB			(USB_TYPE_CLASS | 0x09)
#define USB_DT_HUB_NONVAR_SIZE		7

struct usb_hub_descriptor {
	__u8  bDescLength;
	__u8  bDescriptorType;
	__u8  bNbrPorts;
	__le16 wHubCharacteristics;
	__u8  bPwrOn2PwrGood;
	__u8  bHubContrCurrent;
		/* add 1 bit for hub status change; round to bytes */
	__u8  DeviceRemovable[(USB_MAXCHILDREN + 1 + 7) / 8];
	__u8  PortPwrCtrlMask[(USB_MAXCHILDREN + 1 + 7) / 8];
} __attribute__ ((packed));


/* port indicator status selectors, tables 11-7 and 11-25 */
#define HUB_LED_AUTO	0
#define HUB_LED_AMBER	1
#define HUB_LED_GREEN	2
#define HUB_LED_OFF	3

enum hub_led_mode {
	INDICATOR_AUTO = 0,
	INDICATOR_CYCLE,
	/* software blinks for attention:  software, hardware, reserved */
	INDICATOR_GREEN_BLINK, INDICATOR_GREEN_BLINK_OFF,
	INDICATOR_AMBER_BLINK, INDICATOR_AMBER_BLINK_OFF,
	INDICATOR_ALT_BLINK, INDICATOR_ALT_BLINK_OFF
} __attribute__ ((packed));

/* Transaction Translator Think Times, in bits */
#define HUB_TTTT_8_BITS		0x00
#define HUB_TTTT_16_BITS	0x20
#define HUB_TTTT_24_BITS	0x40
#define HUB_TTTT_32_BITS	0x60

#endif /* __LINUX_HUB_H */