drivers/usb/core/hub.h - maze/linux - Git at Google

 #ifndef __LINUX_HUB_H
 #define __LINUX_HUB_H

 /*
  * Hub protocol and driver data structures.
  *
  * Some of these are known to the "virtual root hub" code
  * in host controller drivers.
  */

 #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
 #define USB_PORT_FEAT_OVER_CURRENT	3
 #define USB_PORT_FEAT_RESET		4
 #define USB_PORT_FEAT_POWER		8
 #define USB_PORT_FEAT_LOWSPEED		9
 #define USB_PORT_FEAT_HIGHSPEED		10
 #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

 /*
  * 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
 /* bits 5 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 */

 /*
  * 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

 /*
  * 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));

 struct usb_device;

 /* 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

 /*
  * As of USB 2.0, full/low speed devices are segregated into trees.
  * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
  * The other type grows from high speed hubs when they connect to
  * full/low speed devices using "Transaction Translators" (TTs).
  *
  * TTs should only be known to the hub driver, and high speed bus
  * drivers (only EHCI for now).  They affect periodic scheduling and
  * sometimes control/bulk error recovery.
  */
 struct usb_tt {
 	struct usb_device	*hub;	/* upstream highspeed hub */
 	int			multi;	/* true means one TT per port */
 	unsigned		think_time;	/* think time in ns */

 	/* for control/bulk error recovery (CLEAR_TT_BUFFER) */
 	spinlock_t		lock;
 	struct list_head	clear_list;	/* of usb_tt_clear */
 	struct work_struct			kevent;
 };

 struct usb_tt_clear {
 	struct list_head	clear_list;
 	unsigned		tt;
 	u16			devinfo;
 };

 extern void usb_hub_tt_clear_buffer (struct usb_device *dev, int pipe);

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

 	/* buffer for urb ... with extra space in case of babble */
 	char			(*buffer)[8];
 	dma_addr_t		buffer_dma;	/* DMA address for buffer */
 	union {
 		struct usb_hub_status	hub;
 		struct usb_port_status	port;
 	}			*status;	/* buffer for status reports */

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

 	struct list_head	event_list;	/* hubs w/data or errs ready */
 	unsigned long		event_bits[1];	/* status change bitmask */
 	unsigned long		change_bits[1];	/* ports with logical connect
 							status change */
 	unsigned long		busy_bits[1];	/* ports being reset */
 #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 */

 	u8			power_budget;	/* in 2mA units; or zero */

 	unsigned		quiescing:1;
 	unsigned		activating:1;
 	unsigned		resume_root_hub:1;

 	unsigned		has_indicators:1;
 	enum hub_led_mode	indicator[USB_MAXCHILDREN];
 	struct work_struct	leds;
 };

 #endif /* __LINUX_HUB_H */
	#ifndef __LINUX_HUB_H
	#define __LINUX_HUB_H

	/*
	* Hub protocol and driver data structures.
	*
	* Some of these are known to the "virtual root hub" code
	* in host controller drivers.
	*/

	#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
	#define USB_PORT_FEAT_OVER_CURRENT 3
	#define USB_PORT_FEAT_RESET 4
	#define USB_PORT_FEAT_POWER 8
	#define USB_PORT_FEAT_LOWSPEED 9
	#define USB_PORT_FEAT_HIGHSPEED 10
	#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

	/*
	* 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
	/* bits 5 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 */

	/*
	* 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

	/*
	* 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));

	struct usb_device;

	/* 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

	/*
	* As of USB 2.0, full/low speed devices are segregated into trees.
	* One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
	* The other type grows from high speed hubs when they connect to
	* full/low speed devices using "Transaction Translators" (TTs).
	*
	* TTs should only be known to the hub driver, and high speed bus
	* drivers (only EHCI for now). They affect periodic scheduling and
	* sometimes control/bulk error recovery.
	*/
	struct usb_tt {
	struct usb_device hub; / upstream highspeed hub */
	int multi; /* true means one TT per port */
	unsigned think_time; /* think time in ns */

	/* for control/bulk error recovery (CLEAR_TT_BUFFER) */
	spinlock_t lock;
	struct list_head clear_list; /* of usb_tt_clear */
	struct work_struct kevent;
	};

	struct usb_tt_clear {
	struct list_head clear_list;
	unsigned tt;
	u16 devinfo;
	};

	extern void usb_hub_tt_clear_buffer (struct usb_device *dev, int pipe);

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

	/* buffer for urb ... with extra space in case of babble */
	char (*buffer)[8];
	dma_addr_t buffer_dma; /* DMA address for buffer */
	union {
	struct usb_hub_status hub;
	struct usb_port_status port;
	} status; / buffer for status reports */

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

	struct list_head event_list; /* hubs w/data or errs ready */
	unsigned long event_bits[1]; /* status change bitmask */
	unsigned long change_bits[1]; /* ports with logical connect
	status change */
	unsigned long busy_bits[1]; /* ports being reset */
	#if USB_MAXCHILDREN > 31 /* 8sizeof(unsigned long) - 1 /
	#error event_bits[] is too short!
	#endif

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

	u8 power_budget; /* in 2mA units; or zero */

	unsigned quiescing:1;
	unsigned activating:1;
	unsigned resume_root_hub:1;

	unsigned has_indicators:1;
	enum hub_led_mode indicator[USB_MAXCHILDREN];
	struct work_struct leds;
	};

	#endif /* __LINUX_HUB_H */