[mirror_ubuntu-focal-kernel.git] / drivers / usb / host / uhci-hub.c

/*
 * Universal Host Controller Interface driver for USB.
 *
 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
 *
 * (C) Copyright 1999 Linus Torvalds
 * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
 * (C) Copyright 1999 Randy Dunlap
 * (C) Copyright 1999 Georg Acher, acher@in.tum.de
 * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
 * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
 * (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
 */

static __u8 root_hub_hub_des[] =
{
	0x09,			/*  __u8  bLength; */
	0x29,			/*  __u8  bDescriptorType; Hub-descriptor */
	0x02,			/*  __u8  bNbrPorts; */
	0x0a,			/* __u16  wHubCharacteristics; */
	0x00,			/*   (per-port OC, no power switching) */
	0x01,			/*  __u8  bPwrOn2pwrGood; 2ms */
	0x00,			/*  __u8  bHubContrCurrent; 0 mA */
	0x00,			/*  __u8  DeviceRemovable; *** 7 Ports max *** */
	0xff			/*  __u8  PortPwrCtrlMask; *** 7 ports max *** */
};

#define	UHCI_RH_MAXCHILD	7

/* must write as zeroes */
#define WZ_BITS		(USBPORTSC_RES2 | USBPORTSC_RES3 | USBPORTSC_RES4)

/* status change bits:  nonzero writes will clear */
#define RWC_BITS	(USBPORTSC_OCC | USBPORTSC_PEC | USBPORTSC_CSC)

/* A port that either is connected or has a changed-bit set will prevent
 * us from AUTO_STOPPING.
 */
static int any_ports_active(struct uhci_hcd *uhci)
{
	int port;

	for (port = 0; port < uhci->rh_numports; ++port) {
		if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) &
				(USBPORTSC_CCS | RWC_BITS)) ||
				test_bit(port, &uhci->port_c_suspend))
			return 1;
	}
	return 0;
}

static inline int get_hub_status_data(struct uhci_hcd *uhci, char *buf)
{
	int port;

	*buf = 0;
	for (port = 0; port < uhci->rh_numports; ++port) {
		if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & RWC_BITS) ||
				test_bit(port, &uhci->port_c_suspend))
			*buf |= (1 << (port + 1));
	}
	return !!*buf;
}

#define OK(x)			len = (x); break

#define CLR_RH_PORTSTAT(x) \
	status = inw(port_addr); \
	status &= ~(RWC_BITS|WZ_BITS); \
	status &= ~(x); \
	status |= RWC_BITS & (x); \
	outw(status, port_addr)

#define SET_RH_PORTSTAT(x) \
	status = inw(port_addr); \
	status |= (x); \
	status &= ~(RWC_BITS|WZ_BITS); \
	outw(status, port_addr)

/* UHCI controllers don't automatically stop resume signalling after 20 msec,
 * so we have to poll and check timeouts in order to take care of it.
 */
static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
		unsigned long port_addr)
{
	int status;

	if (inw(port_addr) & (USBPORTSC_SUSP | USBPORTSC_RD)) {
		CLR_RH_PORTSTAT(USBPORTSC_SUSP | USBPORTSC_RD);
		if (test_bit(port, &uhci->resuming_ports))
			set_bit(port, &uhci->port_c_suspend);

		/* The controller won't actually turn off the RD bit until
		 * it has had a chance to send a low-speed EOP sequence,
		 * which takes 3 bit times (= 2 microseconds).  We'll delay
		 * slightly longer for good luck. */
		udelay(4);
	}
	clear_bit(port, &uhci->resuming_ports);
}

/* Wait for the UHCI controller in HP's iLO2 server management chip.
 * It can take up to 250 us to finish a reset and set the CSC bit.
 */
static void wait_for_HP(unsigned long port_addr)
{
	int i;

	for (i = 10; i < 250; i += 10) {
		if (inw(port_addr) & USBPORTSC_CSC)
			return;
		udelay(10);
	}
	/* Log a warning? */
}

static void uhci_check_ports(struct uhci_hcd *uhci)
{
	unsigned int port;
	unsigned long port_addr;
	int status;

	for (port = 0; port < uhci->rh_numports; ++port) {
		port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
		status = inw(port_addr);
		if (unlikely(status & USBPORTSC_PR)) {
			if (time_after_eq(jiffies, uhci->ports_timeout)) {
				CLR_RH_PORTSTAT(USBPORTSC_PR);
				udelay(10);

				/* HP's server management chip requires
				 * a longer delay. */
				if (to_pci_dev(uhci_dev(uhci))->vendor ==
						PCI_VENDOR_ID_HP)
					wait_for_HP(port_addr);

				/* If the port was enabled before, turning
				 * reset on caused a port enable change.
				 * Turning reset off causes a port connect
				 * status change.  Clear these changes. */
				CLR_RH_PORTSTAT(USBPORTSC_CSC | USBPORTSC_PEC);
				SET_RH_PORTSTAT(USBPORTSC_PE);
			}
		}
		if (unlikely(status & USBPORTSC_RD)) {
			if (!test_bit(port, &uhci->resuming_ports)) {

				/* Port received a wakeup request */
				set_bit(port, &uhci->resuming_ports);
				uhci->ports_timeout = jiffies +
						msecs_to_jiffies(20);

				/* Make sure we see the port again
				 * after the resuming period is over. */
				mod_timer(&uhci_to_hcd(uhci)->rh_timer,
						uhci->ports_timeout);
			} else if (time_after_eq(jiffies,
						uhci->ports_timeout)) {
				uhci_finish_suspend(uhci, port, port_addr);
			}
		}
	}
}

static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	unsigned long flags;
	int status = 0;

	spin_lock_irqsave(&uhci->lock, flags);

	uhci_scan_schedule(uhci, NULL);
	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
		goto done;
	uhci_check_ports(uhci);

	status = get_hub_status_data(uhci, buf);

	switch (uhci->rh_state) {
	    case UHCI_RH_SUSPENDING:
	    case UHCI_RH_SUSPENDED:
		/* if port change, ask to be resumed */
		if (status)
			usb_hcd_resume_root_hub(hcd);
		break;

	    case UHCI_RH_AUTO_STOPPED:
		/* if port change, auto start */
		if (status)
			wakeup_rh(uhci);
		break;

	    case UHCI_RH_RUNNING:
		/* are any devices attached? */
		if (!any_ports_active(uhci)) {
			uhci->rh_state = UHCI_RH_RUNNING_NODEVS;
			uhci->auto_stop_time = jiffies + HZ;
		}
		break;

	    case UHCI_RH_RUNNING_NODEVS:
		/* auto-stop if nothing connected for 1 second */
		if (any_ports_active(uhci))
			uhci->rh_state = UHCI_RH_RUNNING;
		else if (time_after_eq(jiffies, uhci->auto_stop_time))
			suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
		break;

	    default:
		break;
	}

done:
	spin_unlock_irqrestore(&uhci->lock, flags);
	return status;
}

/* size of returned buffer is part of USB spec */
static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
			u16 wIndex, char *buf, u16 wLength)
{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	int status, lstatus, retval = 0, len = 0;
	unsigned int port = wIndex - 1;
	unsigned long port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
	u16 wPortChange, wPortStatus;
	unsigned long flags;

	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
		return -ETIMEDOUT;

	spin_lock_irqsave(&uhci->lock, flags);
	switch (typeReq) {

	case GetHubStatus:
		*(__le32 *)buf = cpu_to_le32(0);
		OK(4);		/* hub power */
	case GetPortStatus:
		if (port >= uhci->rh_numports)
			goto err;

		uhci_check_ports(uhci);
		status = inw(port_addr);

		/* Intel controllers report the OverCurrent bit active on.
		 * VIA controllers report it active off, so we'll adjust the
		 * bit value.  (It's not standardized in the UHCI spec.)
		 */
		if (to_pci_dev(hcd->self.controller)->vendor ==
				PCI_VENDOR_ID_VIA)
			status ^= USBPORTSC_OC;

		/* UHCI doesn't support C_RESET (always false) */
		wPortChange = lstatus = 0;
		if (status & USBPORTSC_CSC)
			wPortChange |= USB_PORT_STAT_C_CONNECTION;
		if (status & USBPORTSC_PEC)
			wPortChange |= USB_PORT_STAT_C_ENABLE;
		if (status & USBPORTSC_OCC)
			wPortChange |= USB_PORT_STAT_C_OVERCURRENT;

		if (test_bit(port, &uhci->port_c_suspend)) {
			wPortChange |= USB_PORT_STAT_C_SUSPEND;
			lstatus |= 1;
		}
		if (test_bit(port, &uhci->resuming_ports))
			lstatus |= 4;

		/* UHCI has no power switching (always on) */
		wPortStatus = USB_PORT_STAT_POWER;
		if (status & USBPORTSC_CCS)
			wPortStatus |= USB_PORT_STAT_CONNECTION;
		if (status & USBPORTSC_PE) {
			wPortStatus |= USB_PORT_STAT_ENABLE;
			if (status & (USBPORTSC_SUSP | USBPORTSC_RD))
				wPortStatus |= USB_PORT_STAT_SUSPEND;
		}
		if (status & USBPORTSC_OC)
			wPortStatus |= USB_PORT_STAT_OVERCURRENT;
		if (status & USBPORTSC_PR)
			wPortStatus |= USB_PORT_STAT_RESET;
		if (status & USBPORTSC_LSDA)
			wPortStatus |= USB_PORT_STAT_LOW_SPEED;

		if (wPortChange)
			dev_dbg(uhci_dev(uhci), "port %d portsc %04x,%02x\n",
					wIndex, status, lstatus);

		*(__le16 *)buf = cpu_to_le16(wPortStatus);
		*(__le16 *)(buf + 2) = cpu_to_le16(wPortChange);
		OK(4);
	case SetHubFeature:		/* We don't implement these */
	case ClearHubFeature:
		switch (wValue) {
		case C_HUB_OVER_CURRENT:
		case C_HUB_LOCAL_POWER:
			OK(0);
		default:
			goto err;
		}
		break;
	case SetPortFeature:
		if (port >= uhci->rh_numports)
			goto err;

		switch (wValue) {
		case USB_PORT_FEAT_SUSPEND:
			SET_RH_PORTSTAT(USBPORTSC_SUSP);
			OK(0);
		case USB_PORT_FEAT_RESET:
			SET_RH_PORTSTAT(USBPORTSC_PR);

			/* Reset terminates Resume signalling */
			uhci_finish_suspend(uhci, port, port_addr);

			/* USB v2.0 7.1.7.5 */
			uhci->ports_timeout = jiffies + msecs_to_jiffies(50);
			OK(0);
		case USB_PORT_FEAT_POWER:
			/* UHCI has no power switching */
			OK(0);
		default:
			goto err;
		}
		break;
	case ClearPortFeature:
		if (port >= uhci->rh_numports)
			goto err;

		switch (wValue) {
		case USB_PORT_FEAT_ENABLE:
			CLR_RH_PORTSTAT(USBPORTSC_PE);

			/* Disable terminates Resume signalling */
			uhci_finish_suspend(uhci, port, port_addr);
			OK(0);
		case USB_PORT_FEAT_C_ENABLE:
			CLR_RH_PORTSTAT(USBPORTSC_PEC);
			OK(0);
		case USB_PORT_FEAT_SUSPEND:
			if (!(inw(port_addr) & USBPORTSC_SUSP)) {

				/* Make certain the port isn't suspended */
				uhci_finish_suspend(uhci, port, port_addr);
			} else if (!test_and_set_bit(port,
						&uhci->resuming_ports)) {
				SET_RH_PORTSTAT(USBPORTSC_RD);

				/* The controller won't allow RD to be set
				 * if the port is disabled.  When this happens
				 * just skip the Resume signalling.
				 */
				if (!(inw(port_addr) & USBPORTSC_RD))
					uhci_finish_suspend(uhci, port,
							port_addr);
				else
					/* USB v2.0 7.1.7.7 */
					uhci->ports_timeout = jiffies +
						msecs_to_jiffies(20);
			}
			OK(0);
		case USB_PORT_FEAT_C_SUSPEND:
			clear_bit(port, &uhci->port_c_suspend);
			OK(0);
		case USB_PORT_FEAT_POWER:
			/* UHCI has no power switching */
			goto err;
		case USB_PORT_FEAT_C_CONNECTION:
			CLR_RH_PORTSTAT(USBPORTSC_CSC);
			OK(0);
		case USB_PORT_FEAT_C_OVER_CURRENT:
			CLR_RH_PORTSTAT(USBPORTSC_OCC);
			OK(0);
		case USB_PORT_FEAT_C_RESET:
			/* this driver won't report these */
			OK(0);
		default:
			goto err;
		}
		break;
	case GetHubDescriptor:
		len = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
		memcpy(buf, root_hub_hub_des, len);
		if (len > 2)
			buf[2] = uhci->rh_numports;
		OK(len);
	default:
err:
		retval = -EPIPE;
	}
	spin_unlock_irqrestore(&uhci->lock, flags);

	return retval;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Universal Host Controller Interface driver for USB.
	3	*
	4	* Maintainer: Alan Stern <stern@rowland.harvard.edu>
	5	*
	6	* (C) Copyright 1999 Linus Torvalds
	7	* (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
	8	* (C) Copyright 1999 Randy Dunlap
	9	* (C) Copyright 1999 Georg Acher, acher@in.tum.de
	10	* (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
	11	* (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
	12	* (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
	13	*/
	14
	15	static __u8 root_hub_hub_des[] =
	16	{
	17	0x09, /* __u8 bLength; */
	18	0x29, /* __u8 bDescriptorType; Hub-descriptor */
	19	0x02, /* __u8 bNbrPorts; */
	20	0x0a, /* __u16 wHubCharacteristics; */
	21	0x00, /* (per-port OC, no power switching) */
	22	0x01, /* __u8 bPwrOn2pwrGood; 2ms */
	23	0x00, /* __u8 bHubContrCurrent; 0 mA */
	24	0x00, /* __u8 DeviceRemovable; * 7 Ports max * */
	25	0xff /* __u8 PortPwrCtrlMask; * 7 ports max * */
	26	};
	27
	28	#define UHCI_RH_MAXCHILD 7
	29
	30	/* must write as zeroes */
	31	#define WZ_BITS (USBPORTSC_RES2 \| USBPORTSC_RES3 \| USBPORTSC_RES4)
	32
	33	/* status change bits: nonzero writes will clear */
	34	#define RWC_BITS (USBPORTSC_OCC \| USBPORTSC_PEC \| USBPORTSC_CSC)
	35
f5946f82 AS	36	/* A port that either is connected or has a changed-bit set will prevent
	37	* us from AUTO_STOPPING.
	38	*/
	39	static int any_ports_active(struct uhci_hcd *uhci)
	40	{
	41	int port;
	42
	43	for (port = 0; port < uhci->rh_numports; ++port) {
	44	if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) &
	45	(USBPORTSC_CCS \| RWC_BITS)) \|\|
	46	test_bit(port, &uhci->port_c_suspend))
	47	return 1;
	48	}
	49	return 0;
	50	}
	51
6c1b445c	52	static inline int get_hub_status_data(struct uhci_hcd uhci, char buf)
1da177e4	53	{
1da177e4 LT	54	int port;
	55
	56	*buf = 0;
	57	for (port = 0; port < uhci->rh_numports; ++port) {
	58	if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & RWC_BITS) \|\|
	59	test_bit(port, &uhci->port_c_suspend))
	60	*buf \|= (1 << (port + 1));
	61	}
1da177e4 LT	62	return !!*buf;
	63	}
	64
	65	#define OK(x) len = (x); break
	66
	67	#define CLR_RH_PORTSTAT(x) \
	68	status = inw(port_addr); \
	69	status &= ~(RWC_BITS\|WZ_BITS); \
	70	status &= ~(x); \
	71	status \|= RWC_BITS & (x); \
	72	outw(status, port_addr)
	73
	74	#define SET_RH_PORTSTAT(x) \
	75	status = inw(port_addr); \
	76	status \|= (x); \
	77	status &= ~(RWC_BITS\|WZ_BITS); \
	78	outw(status, port_addr)
	79
	80	/* UHCI controllers don't automatically stop resume signalling after 20 msec,
	81	* so we have to poll and check timeouts in order to take care of it.
	82	*/
	83	static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
	84	unsigned long port_addr)
	85	{
	86	int status;
	87
8e326406	88	if (inw(port_addr) & (USBPORTSC_SUSP \| USBPORTSC_RD)) {
1da177e4	89	CLR_RH_PORTSTAT(USBPORTSC_SUSP \| USBPORTSC_RD);
8e326406 AS	90	if (test_bit(port, &uhci->resuming_ports))
8e326406 AS	91	set_bit(port, &uhci->port_c_suspend);
1da177e4 LT	92
	93	/* The controller won't actually turn off the RD bit until
	94	* it has had a chance to send a low-speed EOP sequence,
	95	* which takes 3 bit times (= 2 microseconds). We'll delay
	96	* slightly longer for good luck. */
	97	udelay(4);
	98	}
8e326406	99	clear_bit(port, &uhci->resuming_ports);
1da177e4 LT	100	}
1da177e4 LT	101
ae557175 AS	102	/* Wait for the UHCI controller in HP's iLO2 server management chip.
	103	* It can take up to 250 us to finish a reset and set the CSC bit.
	104	*/
	105	static void wait_for_HP(unsigned long port_addr)
	106	{
	107	int i;
	108
	109	for (i = 10; i < 250; i += 10) {
	110	if (inw(port_addr) & USBPORTSC_CSC)
	111	return;
	112	udelay(10);
	113	}
	114	/* Log a warning? */
	115	}
	116
1da177e4 LT	117	static void uhci_check_ports(struct uhci_hcd *uhci)
	118	{
	119	unsigned int port;
	120	unsigned long port_addr;
	121	int status;
	122
	123	for (port = 0; port < uhci->rh_numports; ++port) {
	124	port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
	125	status = inw(port_addr);
	126	if (unlikely(status & USBPORTSC_PR)) {
	127	if (time_after_eq(jiffies, uhci->ports_timeout)) {
	128	CLR_RH_PORTSTAT(USBPORTSC_PR);
	129	udelay(10);
	130
ae557175 AS	131	/* HP's server management chip requires
	132	* a longer delay. */
	133	if (to_pci_dev(uhci_dev(uhci))->vendor ==
	134	PCI_VENDOR_ID_HP)
	135	wait_for_HP(port_addr);
	136
1da177e4 LT	137	/* If the port was enabled before, turning
	138	* reset on caused a port enable change.
	139	* Turning reset off causes a port connect
	140	* status change. Clear these changes. */
	141	CLR_RH_PORTSTAT(USBPORTSC_CSC \| USBPORTSC_PEC);
	142	SET_RH_PORTSTAT(USBPORTSC_PE);
	143	}
	144	}
	145	if (unlikely(status & USBPORTSC_RD)) {
	146	if (!test_bit(port, &uhci->resuming_ports)) {
	147
	148	/* Port received a wakeup request */
	149	set_bit(port, &uhci->resuming_ports);
	150	uhci->ports_timeout = jiffies +
	151	msecs_to_jiffies(20);
6c1b445c AS	152
	153	/* Make sure we see the port again
	154	* after the resuming period is over. */
	155	mod_timer(&uhci_to_hcd(uhci)->rh_timer,
	156	uhci->ports_timeout);
1da177e4 LT	157	} else if (time_after_eq(jiffies,
	158	uhci->ports_timeout)) {
	159	uhci_finish_suspend(uhci, port, port_addr);
	160	}
	161	}
	162	}
	163	}
	164
6c1b445c AS	165	static int uhci_hub_status_data(struct usb_hcd hcd, char buf)
	166	{
	167	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	168	unsigned long flags;
1f09df8b	169	int status = 0;
6c1b445c AS	170
6c1b445c AS	171	spin_lock_irqsave(&uhci->lock, flags);
6c1b445c	172
1f09df8b	173	uhci_scan_schedule(uhci, NULL);
e323de46	174	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) \|\| uhci->dead)
1f09df8b	175	goto done;
6c1b445c	176	uhci_check_ports(uhci);
1f09df8b	177
6c1b445c AS	178	status = get_hub_status_data(uhci, buf);
	179
	180	switch (uhci->rh_state) {
	181	case UHCI_RH_SUSPENDING:
	182	case UHCI_RH_SUSPENDED:
	183	/* if port change, ask to be resumed */
	184	if (status)
	185	usb_hcd_resume_root_hub(hcd);
	186	break;
	187
	188	case UHCI_RH_AUTO_STOPPED:
	189	/* if port change, auto start */
	190	if (status)
	191	wakeup_rh(uhci);
	192	break;
	193
	194	case UHCI_RH_RUNNING:
	195	/* are any devices attached? */
	196	if (!any_ports_active(uhci)) {
	197	uhci->rh_state = UHCI_RH_RUNNING_NODEVS;
	198	uhci->auto_stop_time = jiffies + HZ;
	199	}
	200	break;
	201
	202	case UHCI_RH_RUNNING_NODEVS:
	203	/* auto-stop if nothing connected for 1 second */
	204	if (any_ports_active(uhci))
	205	uhci->rh_state = UHCI_RH_RUNNING;
	206	else if (time_after_eq(jiffies, uhci->auto_stop_time))
	207	suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
	208	break;
	209
	210	default:
	211	break;
	212	}
	213
	214	done:
	215	spin_unlock_irqrestore(&uhci->lock, flags);
	216	return status;
	217	}
	218
1da177e4 LT	219	/* size of returned buffer is part of USB spec */
	220	static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
	221	u16 wIndex, char *buf, u16 wLength)
	222	{
	223	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	224	int status, lstatus, retval = 0, len = 0;
	225	unsigned int port = wIndex - 1;
	226	unsigned long port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
	227	u16 wPortChange, wPortStatus;
	228	unsigned long flags;
	229
e323de46	230	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) \|\| uhci->dead)
a8bed8b6 AS	231	return -ETIMEDOUT;
a8bed8b6 AS	232
1da177e4 LT	233	spin_lock_irqsave(&uhci->lock, flags);
	234	switch (typeReq) {
	235
	236	case GetHubStatus:
	237	(__le32 )buf = cpu_to_le32(0);
	238	OK(4); /* hub power */
	239	case GetPortStatus:
	240	if (port >= uhci->rh_numports)
	241	goto err;
	242
	243	uhci_check_ports(uhci);
	244	status = inw(port_addr);
	245
	246	/* Intel controllers report the OverCurrent bit active on.
	247	* VIA controllers report it active off, so we'll adjust the
	248	* bit value. (It's not standardized in the UHCI spec.)
	249	*/
	250	if (to_pci_dev(hcd->self.controller)->vendor ==
	251	PCI_VENDOR_ID_VIA)
	252	status ^= USBPORTSC_OC;
	253
	254	/* UHCI doesn't support C_RESET (always false) */
	255	wPortChange = lstatus = 0;
	256	if (status & USBPORTSC_CSC)
	257	wPortChange \|= USB_PORT_STAT_C_CONNECTION;
	258	if (status & USBPORTSC_PEC)
	259	wPortChange \|= USB_PORT_STAT_C_ENABLE;
	260	if (status & USBPORTSC_OCC)
	261	wPortChange \|= USB_PORT_STAT_C_OVERCURRENT;
	262
	263	if (test_bit(port, &uhci->port_c_suspend)) {
	264	wPortChange \|= USB_PORT_STAT_C_SUSPEND;
	265	lstatus \|= 1;
	266	}
1da177e4 LT	267	if (test_bit(port, &uhci->resuming_ports))
	268	lstatus \|= 4;
	269
	270	/* UHCI has no power switching (always on) */
	271	wPortStatus = USB_PORT_STAT_POWER;
	272	if (status & USBPORTSC_CCS)
	273	wPortStatus \|= USB_PORT_STAT_CONNECTION;
	274	if (status & USBPORTSC_PE) {
	275	wPortStatus \|= USB_PORT_STAT_ENABLE;
	276	if (status & (USBPORTSC_SUSP \| USBPORTSC_RD))
	277	wPortStatus \|= USB_PORT_STAT_SUSPEND;
	278	}
	279	if (status & USBPORTSC_OC)
	280	wPortStatus \|= USB_PORT_STAT_OVERCURRENT;
	281	if (status & USBPORTSC_PR)
	282	wPortStatus \|= USB_PORT_STAT_RESET;
	283	if (status & USBPORTSC_LSDA)
	284	wPortStatus \|= USB_PORT_STAT_LOW_SPEED;
	285
	286	if (wPortChange)
	287	dev_dbg(uhci_dev(uhci), "port %d portsc %04x,%02x\n",
	288	wIndex, status, lstatus);
	289
	290	(__le16 )buf = cpu_to_le16(wPortStatus);
	291	(__le16 )(buf + 2) = cpu_to_le16(wPortChange);
	292	OK(4);
	293	case SetHubFeature: /* We don't implement these */
	294	case ClearHubFeature:
	295	switch (wValue) {
	296	case C_HUB_OVER_CURRENT:
	297	case C_HUB_LOCAL_POWER:
	298	OK(0);
	299	default:
	300	goto err;
	301	}
	302	break;
	303	case SetPortFeature:
	304	if (port >= uhci->rh_numports)
	305	goto err;
	306
	307	switch (wValue) {
	308	case USB_PORT_FEAT_SUSPEND:
1da177e4 LT	309	SET_RH_PORTSTAT(USBPORTSC_SUSP);
	310	OK(0);
	311	case USB_PORT_FEAT_RESET:
	312	SET_RH_PORTSTAT(USBPORTSC_PR);
	313
	314	/* Reset terminates Resume signalling */
	315	uhci_finish_suspend(uhci, port, port_addr);
	316
	317	/* USB v2.0 7.1.7.5 */
	318	uhci->ports_timeout = jiffies + msecs_to_jiffies(50);
	319	OK(0);
	320	case USB_PORT_FEAT_POWER:
	321	/* UHCI has no power switching */
	322	OK(0);
	323	default:
	324	goto err;
	325	}
	326	break;
	327	case ClearPortFeature:
	328	if (port >= uhci->rh_numports)
	329	goto err;
	330
	331	switch (wValue) {
	332	case USB_PORT_FEAT_ENABLE:
	333	CLR_RH_PORTSTAT(USBPORTSC_PE);
	334
	335	/* Disable terminates Resume signalling */
	336	uhci_finish_suspend(uhci, port, port_addr);
	337	OK(0);
	338	case USB_PORT_FEAT_C_ENABLE:
	339	CLR_RH_PORTSTAT(USBPORTSC_PEC);
	340	OK(0);
	341	case USB_PORT_FEAT_SUSPEND:
8e326406 AS	342	if (!(inw(port_addr) & USBPORTSC_SUSP)) {
	343
	344	/* Make certain the port isn't suspended */
	345	uhci_finish_suspend(uhci, port, port_addr);
	346	} else if (!test_and_set_bit(port,
1da177e4 LT	347	&uhci->resuming_ports)) {
	348	SET_RH_PORTSTAT(USBPORTSC_RD);
	349
	350	/* The controller won't allow RD to be set
	351	* if the port is disabled. When this happens
	352	* just skip the Resume signalling.
	353	*/
	354	if (!(inw(port_addr) & USBPORTSC_RD))
	355	uhci_finish_suspend(uhci, port,
	356	port_addr);
	357	else
	358	/* USB v2.0 7.1.7.7 */
	359	uhci->ports_timeout = jiffies +
	360	msecs_to_jiffies(20);
	361	}
	362	OK(0);
	363	case USB_PORT_FEAT_C_SUSPEND:
	364	clear_bit(port, &uhci->port_c_suspend);
	365	OK(0);
	366	case USB_PORT_FEAT_POWER:
	367	/* UHCI has no power switching */
	368	goto err;
	369	case USB_PORT_FEAT_C_CONNECTION:
	370	CLR_RH_PORTSTAT(USBPORTSC_CSC);
	371	OK(0);
	372	case USB_PORT_FEAT_C_OVER_CURRENT:
	373	CLR_RH_PORTSTAT(USBPORTSC_OCC);
	374	OK(0);
	375	case USB_PORT_FEAT_C_RESET:
	376	/* this driver won't report these */
	377	OK(0);
	378	default:
	379	goto err;
	380	}
	381	break;
	382	case GetHubDescriptor:
	383	len = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
	384	memcpy(buf, root_hub_hub_des, len);
	385	if (len > 2)
	386	buf[2] = uhci->rh_numports;
	387	OK(len);
	388	default:
	389	err:
	390	retval = -EPIPE;
	391	}
	392	spin_unlock_irqrestore(&uhci->lock, flags);
	393
	394	return retval;
	395	}