[deliverable/linux.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 (test_bit(port, &uhci->suspended_ports)) {
		CLR_RH_PORTSTAT(USBPORTSC_SUSP | USBPORTSC_RD);
		clear_bit(port, &uhci->suspended_ports);
		clear_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);
	}
}

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);

				/* 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 (uhci->hc_inaccessible)
		goto done;
	check_fsbr(uhci);
	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 (uhci->hc_inaccessible)
		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->suspended_ports))
			lstatus |= 2;
		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_bit(port, &uhci->suspended_ports);
			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 (test_bit(port, &uhci->suspended_ports) &&
					!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
	88	if (test_bit(port, &uhci->suspended_ports)) {
	89	CLR_RH_PORTSTAT(USBPORTSC_SUSP \| USBPORTSC_RD);
	90	clear_bit(port, &uhci->suspended_ports);
	91	clear_bit(port, &uhci->resuming_ports);
	92	set_bit(port, &uhci->port_c_suspend);
	93
	94	/* The controller won't actually turn off the RD bit until
	95	* it has had a chance to send a low-speed EOP sequence,
	96	* which takes 3 bit times (= 2 microseconds). We'll delay
	97	* slightly longer for good luck. */
	98	udelay(4);
	99	}
	100	}
	101
	102	static void uhci_check_ports(struct uhci_hcd *uhci)
	103	{
	104	unsigned int port;
	105	unsigned long port_addr;
	106	int status;
	107
	108	for (port = 0; port < uhci->rh_numports; ++port) {
	109	port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
	110	status = inw(port_addr);
	111	if (unlikely(status & USBPORTSC_PR)) {
	112	if (time_after_eq(jiffies, uhci->ports_timeout)) {
	113	CLR_RH_PORTSTAT(USBPORTSC_PR);
	114	udelay(10);
	115
	116	/* If the port was enabled before, turning
	117	* reset on caused a port enable change.
	118	* Turning reset off causes a port connect
	119	* status change. Clear these changes. */
	120	CLR_RH_PORTSTAT(USBPORTSC_CSC \| USBPORTSC_PEC);
	121	SET_RH_PORTSTAT(USBPORTSC_PE);
	122	}
	123	}
	124	if (unlikely(status & USBPORTSC_RD)) {
	125	if (!test_bit(port, &uhci->resuming_ports)) {
126
127	/* Port received a wakeup request */
128	set_bit(port, &uhci->resuming_ports);
129	uhci->ports_timeout = jiffies +
130	msecs_to_jiffies(20);
6c1b445c AS	131
	132	/* Make sure we see the port again
	133	* after the resuming period is over. */
	134	mod_timer(&uhci_to_hcd(uhci)->rh_timer,
	135	uhci->ports_timeout);
1da177e4 LT	136	} else if (time_after_eq(jiffies,
	137	uhci->ports_timeout)) {
	138	uhci_finish_suspend(uhci, port, port_addr);
	139	}
	140	}
	141	}
	142	}
	143
6c1b445c AS	144	static int uhci_hub_status_data(struct usb_hcd hcd, char buf)
	145	{
	146	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	147	unsigned long flags;
1f09df8b	148	int status = 0;
6c1b445c AS	149
6c1b445c AS	150	spin_lock_irqsave(&uhci->lock, flags);
6c1b445c	151
1f09df8b AS	152	uhci_scan_schedule(uhci, NULL);
	153	if (uhci->hc_inaccessible)
	154	goto done;
	155	check_fsbr(uhci);
6c1b445c	156	uhci_check_ports(uhci);
1f09df8b	157
6c1b445c AS	158	status = get_hub_status_data(uhci, buf);
	159
	160	switch (uhci->rh_state) {
	161	case UHCI_RH_SUSPENDING:
	162	case UHCI_RH_SUSPENDED:
	163	/* if port change, ask to be resumed */
	164	if (status)
	165	usb_hcd_resume_root_hub(hcd);
	166	break;
	167
	168	case UHCI_RH_AUTO_STOPPED:
	169	/* if port change, auto start */
	170	if (status)
	171	wakeup_rh(uhci);
	172	break;
	173
	174	case UHCI_RH_RUNNING:
	175	/* are any devices attached? */
	176	if (!any_ports_active(uhci)) {
	177	uhci->rh_state = UHCI_RH_RUNNING_NODEVS;
	178	uhci->auto_stop_time = jiffies + HZ;
	179	}
	180	break;
	181
	182	case UHCI_RH_RUNNING_NODEVS:
	183	/* auto-stop if nothing connected for 1 second */
	184	if (any_ports_active(uhci))
	185	uhci->rh_state = UHCI_RH_RUNNING;
	186	else if (time_after_eq(jiffies, uhci->auto_stop_time))
	187	suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
	188	break;
	189
	190	default:
	191	break;
	192	}
	193
	194	done:
	195	spin_unlock_irqrestore(&uhci->lock, flags);
	196	return status;
	197	}
	198
1da177e4 LT	199	/* size of returned buffer is part of USB spec */
	200	static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
	201	u16 wIndex, char *buf, u16 wLength)
	202	{
	203	struct uhci_hcd *uhci = hcd_to_uhci(hcd);
	204	int status, lstatus, retval = 0, len = 0;
	205	unsigned int port = wIndex - 1;
	206	unsigned long port_addr = uhci->io_addr + USBPORTSC1 + 2 * port;
	207	u16 wPortChange, wPortStatus;
	208	unsigned long flags;
	209
a8bed8b6 AS	210	if (uhci->hc_inaccessible)
	211	return -ETIMEDOUT;
	212
1da177e4 LT	213	spin_lock_irqsave(&uhci->lock, flags);
	214	switch (typeReq) {
	215
	216	case GetHubStatus:
	217	(__le32 )buf = cpu_to_le32(0);
	218	OK(4); /* hub power */
	219	case GetPortStatus:
	220	if (port >= uhci->rh_numports)
	221	goto err;
	222
	223	uhci_check_ports(uhci);
	224	status = inw(port_addr);
	225
	226	/* Intel controllers report the OverCurrent bit active on.
	227	* VIA controllers report it active off, so we'll adjust the
	228	* bit value. (It's not standardized in the UHCI spec.)
	229	*/
	230	if (to_pci_dev(hcd->self.controller)->vendor ==
	231	PCI_VENDOR_ID_VIA)
	232	status ^= USBPORTSC_OC;
	233
	234	/* UHCI doesn't support C_RESET (always false) */
	235	wPortChange = lstatus = 0;
	236	if (status & USBPORTSC_CSC)
	237	wPortChange \|= USB_PORT_STAT_C_CONNECTION;
	238	if (status & USBPORTSC_PEC)
	239	wPortChange \|= USB_PORT_STAT_C_ENABLE;
	240	if (status & USBPORTSC_OCC)
	241	wPortChange \|= USB_PORT_STAT_C_OVERCURRENT;
	242
	243	if (test_bit(port, &uhci->port_c_suspend)) {
	244	wPortChange \|= USB_PORT_STAT_C_SUSPEND;
	245	lstatus \|= 1;
	246	}
	247	if (test_bit(port, &uhci->suspended_ports))
	248	lstatus \|= 2;
	249	if (test_bit(port, &uhci->resuming_ports))
	250	lstatus \|= 4;
	251
	252	/* UHCI has no power switching (always on) */
	253	wPortStatus = USB_PORT_STAT_POWER;
	254	if (status & USBPORTSC_CCS)
	255	wPortStatus \|= USB_PORT_STAT_CONNECTION;
	256	if (status & USBPORTSC_PE) {
	257	wPortStatus \|= USB_PORT_STAT_ENABLE;
	258	if (status & (USBPORTSC_SUSP \| USBPORTSC_RD))
	259	wPortStatus \|= USB_PORT_STAT_SUSPEND;
	260	}
	261	if (status & USBPORTSC_OC)
	262	wPortStatus \|= USB_PORT_STAT_OVERCURRENT;
	263	if (status & USBPORTSC_PR)
	264	wPortStatus \|= USB_PORT_STAT_RESET;
	265	if (status & USBPORTSC_LSDA)
	266	wPortStatus \|= USB_PORT_STAT_LOW_SPEED;
	267
	268	if (wPortChange)
	269	dev_dbg(uhci_dev(uhci), "port %d portsc %04x,%02x\n",
	270	wIndex, status, lstatus);
	271
	272	(__le16 )buf = cpu_to_le16(wPortStatus);
	273	(__le16 )(buf + 2) = cpu_to_le16(wPortChange);
	274	OK(4);
	275	case SetHubFeature: /* We don't implement these */
	276	case ClearHubFeature:
277	switch (wValue) {
278	case C_HUB_OVER_CURRENT:
279	case C_HUB_LOCAL_POWER:
280	OK(0);
281	default:
282	goto err;
283	}
284	break;
285	case SetPortFeature:
286	if (port >= uhci->rh_numports)
287	goto err;
288
289	switch (wValue) {
290	case USB_PORT_FEAT_SUSPEND:
291	set_bit(port, &uhci->suspended_ports);
292	SET_RH_PORTSTAT(USBPORTSC_SUSP);
293	OK(0);
294	case USB_PORT_FEAT_RESET:
295	SET_RH_PORTSTAT(USBPORTSC_PR);
296
297	/* Reset terminates Resume signalling */
298	uhci_finish_suspend(uhci, port, port_addr);
299
300	/* USB v2.0 7.1.7.5 */
301	uhci->ports_timeout = jiffies + msecs_to_jiffies(50);
302	OK(0);
303	case USB_PORT_FEAT_POWER:
304	/* UHCI has no power switching */
305	OK(0);
306	default:
307	goto err;
308	}
309	break;
310	case ClearPortFeature:
311	if (port >= uhci->rh_numports)
312	goto err;
313
314	switch (wValue) {
315	case USB_PORT_FEAT_ENABLE:
316	CLR_RH_PORTSTAT(USBPORTSC_PE);
317
318	/* Disable terminates Resume signalling */
319	uhci_finish_suspend(uhci, port, port_addr);
320	OK(0);
321	case USB_PORT_FEAT_C_ENABLE:
322	CLR_RH_PORTSTAT(USBPORTSC_PEC);
323	OK(0);
324	case USB_PORT_FEAT_SUSPEND:
325	if (test_bit(port, &uhci->suspended_ports) &&
326	!test_and_set_bit(port,
327	&uhci->resuming_ports)) {
328	SET_RH_PORTSTAT(USBPORTSC_RD);
329
330	/* The controller won't allow RD to be set
331	* if the port is disabled. When this happens
332	* just skip the Resume signalling.
333	*/
334	if (!(inw(port_addr) & USBPORTSC_RD))
335	uhci_finish_suspend(uhci, port,
336	port_addr);
337	else
338	/* USB v2.0 7.1.7.7 */
339	uhci->ports_timeout = jiffies +
340	msecs_to_jiffies(20);
341	}
342	OK(0);
343	case USB_PORT_FEAT_C_SUSPEND:
344	clear_bit(port, &uhci->port_c_suspend);
345	OK(0);
346	case USB_PORT_FEAT_POWER:
347	/* UHCI has no power switching */
348	goto err;
349	case USB_PORT_FEAT_C_CONNECTION:
350	CLR_RH_PORTSTAT(USBPORTSC_CSC);
351	OK(0);
352	case USB_PORT_FEAT_C_OVER_CURRENT:
353	CLR_RH_PORTSTAT(USBPORTSC_OCC);
354	OK(0);
355	case USB_PORT_FEAT_C_RESET:
356	/* this driver won't report these */
357	OK(0);
358	default:
359	goto err;
360	}
361	break;
362	case GetHubDescriptor:
363	len = min_t(unsigned int, sizeof(root_hub_hub_des), wLength);
364	memcpy(buf, root_hub_hub_des, len);
365	if (len > 2)
366	buf[2] = uhci->rh_numports;
367	OK(len);
368	default:
369	err:
370	retval = -EPIPE;
371	}
372	spin_unlock_irqrestore(&uhci->lock, flags);
373
374	return retval;
375	}