[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / wusbcore / rh.c

/*
 * Wireless USB Host Controller
 * Root Hub operations
 *
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * We fake a root hub that has fake ports (as many as simultaneous
 * devices the Wireless USB Host Controller can deal with). For each
 * port we keep an state in @wusbhc->port[index] identical to the one
 * specified in the USB2.0[ch11] spec and some extra device
 * information that complements the one in 'struct usb_device' (as
 * this lacs a hcpriv pointer).
 *
 * Note this is common to WHCI and HWA host controllers.
 *
 * Through here we enable most of the state changes that the USB stack
 * will use to connect or disconnect devices. We need to do some
 * forced adaptation of Wireless USB device states vs. wired:
 *
 *        USB:                 WUSB:
 *
 * Port   Powered-off          port slot n/a
 *        Powered-on           port slot available
 *        Disconnected         port slot available
 *        Connected            port slot assigned device
 *        		       device sent DN_Connect
 *                             device was authenticated
 *        Enabled              device is authenticated, transitioned
 *                             from unauth -> auth -> default address
 *                             -> enabled
 *        Reset                disconnect
 *        Disable              disconnect
 *
 * This maps the standard USB port states with the WUSB device states
 * so we can fake ports without having to modify the USB stack.
 *
 * FIXME: this process will change in the future
 *
 *
 * ENTRY POINTS
 *
 * Our entry points into here are, as in hcd.c, the USB stack root hub
 * ops defined in the usb_hcd struct:
 *
 * wusbhc_rh_status_data()	Provide hub and port status data bitmap
 *
 * wusbhc_rh_control()          Execution of all the major requests
 *                              you can do to a hub (Set|Clear
 *                              features, get descriptors, status, etc).
 *
 * wusbhc_rh_[suspend|resume]() That
 *
 * wusbhc_rh_start_port_reset() ??? unimplemented
 */
#include "wusbhc.h"

/*
 * Reset a fake port
 *
 * Using a Reset Device IE is too heavyweight as it causes the device
 * to enter the UnConnected state and leave the cluster, this can mean
 * that when the device reconnects it is connected to a different fake
 * port.
 *
 * Instead, reset authenticated devices with a SetAddress(0), followed
 * by a SetAddresss(AuthAddr).
 *
 * For unauthenticated devices just pretend to reset but do nothing.
 * If the device initialization continues to fail it will eventually
 * time out after TrustTimeout and enter the UnConnected state.
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 *
 * Supposedly we are the only thread accesing @wusbhc->port; in any
 * case, maybe we should move the mutex locking from
 * wusbhc_devconnect_auth() to here.
 *
 * @port_idx refers to the wusbhc's port index, not the USB port number
 */
static int wusbhc_rh_port_reset(struct wusbhc *wusbhc, u8 port_idx)
{
	int result = 0;
	struct wusb_port *port = wusb_port_by_idx(wusbhc, port_idx);
	struct wusb_dev *wusb_dev = port->wusb_dev;

	port->status |= USB_PORT_STAT_RESET;
	port->change |= USB_PORT_STAT_C_RESET;

	if (wusb_dev->addr & WUSB_DEV_ADDR_UNAUTH)
		result = 0;
	else
		result = wusb_dev_update_address(wusbhc, wusb_dev);

	port->status &= ~USB_PORT_STAT_RESET;
	port->status |= USB_PORT_STAT_ENABLE;
	port->change |= USB_PORT_STAT_C_RESET | USB_PORT_STAT_C_ENABLE;	

	return result;
}

/*
 * Return the hub change status bitmap
 *
 * The bits in the change status bitmap are cleared when a
 * ClearPortFeature request is issued (USB2.0[11.12.3,11.12.4].
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 *
 * WARNING!! This gets called from atomic context; we cannot get the
 *           mutex--the only race condition we can find is some bit
 *           changing just after we copy it, which shouldn't be too
 *           big of a problem [and we can't make it an spinlock
 *           because other parts need to take it and sleep] .
 *
 *           @usb_hcd is refcounted, so it won't dissapear under us
 *           and before killing a host, the polling of the root hub
 *           would be stopped anyway.
 */
int wusbhc_rh_status_data(struct usb_hcd *usb_hcd, char *_buf)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	size_t cnt, size;
	unsigned long *buf = (unsigned long *) _buf;

	/* WE DON'T LOCK, see comment */
	size = wusbhc->ports_max + 1 /* hub bit */;
	size = (size + 8 - 1) / 8;	/* round to bytes */
	for (cnt = 0; cnt < wusbhc->ports_max; cnt++)
		if (wusb_port_by_idx(wusbhc, cnt)->change)
			set_bit(cnt + 1, buf);
		else
			clear_bit(cnt + 1, buf);
	return size;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_status_data);

/*
 * Return the hub's desciptor
 *
 * NOTE: almost cut and paste from ehci-hub.c
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked
 */
static int wusbhc_rh_get_hub_descr(struct wusbhc *wusbhc, u16 wValue,
				   u16 wIndex,
				   struct usb_hub_descriptor *descr,
				   u16 wLength)
{
	u16 temp = 1 + (wusbhc->ports_max / 8);
	u8 length = 7 + 2 * temp;

	if (wLength < length)
		return -ENOSPC;
	descr->bDescLength = 7 + 2 * temp;
	descr->bDescriptorType = 0x29;	/* HUB type */
	descr->bNbrPorts = wusbhc->ports_max;
	descr->wHubCharacteristics = cpu_to_le16(
		0x00			/* All ports power at once */
		| 0x00			/* not part of compound device */
		| 0x10			/* No overcurrent protection */
		| 0x00			/* 8 FS think time FIXME ?? */
		| 0x00);		/* No port indicators */
	descr->bPwrOn2PwrGood = 0;
	descr->bHubContrCurrent = 0;
	/* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
	memset(&descr->bitmap[0], 0, temp);
	memset(&descr->bitmap[temp], 0xff, temp);
	return 0;
}

/*
 * Clear a hub feature
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 *
 * Nothing to do, so no locking needed ;)
 */
static int wusbhc_rh_clear_hub_feat(struct wusbhc *wusbhc, u16 feature)
{
	int result;

	switch (feature) {
	case C_HUB_LOCAL_POWER:
		/* FIXME: maybe plug bit 0 to the power input status,
		 * if any?
		 * see wusbhc_rh_get_hub_status() */
	case C_HUB_OVER_CURRENT:
		result = 0;
		break;
	default:
		result = -EPIPE;
	}
	return result;
}

/*
 * Return hub status (it is always zero...)
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 *
 * Nothing to do, so no locking needed ;)
 */
static int wusbhc_rh_get_hub_status(struct wusbhc *wusbhc, u32 *buf,
				    u16 wLength)
{
	/* FIXME: maybe plug bit 0 to the power input status (if any)? */
	*buf = 0;
	return 0;
}

/*
 * Set a port feature
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 */
static int wusbhc_rh_set_port_feat(struct wusbhc *wusbhc, u16 feature,
				   u8 selector, u8 port_idx)
{
	struct device *dev = wusbhc->dev;

	if (port_idx > wusbhc->ports_max)
		return -EINVAL;

	switch (feature) {
		/* According to USB2.0[11.24.2.13]p2, these features
		 * are not required to be implemented. */
	case USB_PORT_FEAT_C_OVER_CURRENT:
	case USB_PORT_FEAT_C_ENABLE:
	case USB_PORT_FEAT_C_SUSPEND:
	case USB_PORT_FEAT_C_CONNECTION:
	case USB_PORT_FEAT_C_RESET:
		return 0;
	case USB_PORT_FEAT_POWER:
		/* No such thing, but we fake it works */
		mutex_lock(&wusbhc->mutex);
		wusb_port_by_idx(wusbhc, port_idx)->status |= USB_PORT_STAT_POWER;
		mutex_unlock(&wusbhc->mutex);
		return 0;
	case USB_PORT_FEAT_RESET:
		return wusbhc_rh_port_reset(wusbhc, port_idx);
	case USB_PORT_FEAT_ENABLE:
	case USB_PORT_FEAT_SUSPEND:
		dev_err(dev, "(port_idx %d) set feat %d/%d UNIMPLEMENTED\n",
			port_idx, feature, selector);
		return -ENOSYS;
	default:
		dev_err(dev, "(port_idx %d) set feat %d/%d UNKNOWN\n",
			port_idx, feature, selector);
		return -EPIPE;
	}

	return 0;
}

/*
 * Clear a port feature...
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 */
static int wusbhc_rh_clear_port_feat(struct wusbhc *wusbhc, u16 feature,
				     u8 selector, u8 port_idx)
{
	int result = 0;
	struct device *dev = wusbhc->dev;

	if (port_idx > wusbhc->ports_max)
		return -EINVAL;

	mutex_lock(&wusbhc->mutex);
	switch (feature) {
	case USB_PORT_FEAT_POWER:	/* fake port always on */
		/* According to USB2.0[11.24.2.7.1.4], no need to implement? */
	case USB_PORT_FEAT_C_OVER_CURRENT:
		break;
	case USB_PORT_FEAT_C_RESET:
		wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_RESET;
		break;
	case USB_PORT_FEAT_C_CONNECTION:
		wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_CONNECTION;
		break;
	case USB_PORT_FEAT_ENABLE:
		__wusbhc_dev_disable(wusbhc, port_idx);
		break;
	case USB_PORT_FEAT_C_ENABLE:
		wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_ENABLE;
		break;
	case USB_PORT_FEAT_SUSPEND:
	case USB_PORT_FEAT_C_SUSPEND:
		dev_err(dev, "(port_idx %d) Clear feat %d/%d UNIMPLEMENTED\n",
			port_idx, feature, selector);
		result = -ENOSYS;
		break;
	default:
		dev_err(dev, "(port_idx %d) Clear feat %d/%d UNKNOWN\n",
			port_idx, feature, selector);
		result = -EPIPE;
		break;
	}
	mutex_unlock(&wusbhc->mutex);

	return result;
}

/*
 * Return the port's status
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 */
static int wusbhc_rh_get_port_status(struct wusbhc *wusbhc, u16 port_idx,
				     u32 *_buf, u16 wLength)
{
	u16 *buf = (u16 *) _buf;

	if (port_idx > wusbhc->ports_max)
		return -EINVAL;

	mutex_lock(&wusbhc->mutex);
	buf[0] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->status);
	buf[1] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->change);
	mutex_unlock(&wusbhc->mutex);

	return 0;
}

/*
 * Entry point for Root Hub operations
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 */
int wusbhc_rh_control(struct usb_hcd *usb_hcd, u16 reqntype, u16 wValue,
		      u16 wIndex, char *buf, u16 wLength)
{
	int result = -ENOSYS;
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);

	switch (reqntype) {
	case GetHubDescriptor:
		result = wusbhc_rh_get_hub_descr(
			wusbhc, wValue, wIndex,
			(struct usb_hub_descriptor *) buf, wLength);
		break;
	case ClearHubFeature:
		result = wusbhc_rh_clear_hub_feat(wusbhc, wValue);
		break;
	case GetHubStatus:
		result = wusbhc_rh_get_hub_status(wusbhc, (u32 *)buf, wLength);
		break;

	case SetPortFeature:
		result = wusbhc_rh_set_port_feat(wusbhc, wValue, wIndex >> 8,
						 (wIndex & 0xff) - 1);
		break;
	case ClearPortFeature:
		result = wusbhc_rh_clear_port_feat(wusbhc, wValue, wIndex >> 8,
						   (wIndex & 0xff) - 1);
		break;
	case GetPortStatus:
		result = wusbhc_rh_get_port_status(wusbhc, wIndex - 1,
						   (u32 *)buf, wLength);
		break;

	case SetHubFeature:
	default:
		dev_err(wusbhc->dev, "%s (%p [%p], %x, %x, %x, %p, %x) "
			"UNIMPLEMENTED\n", __func__, usb_hcd, wusbhc, reqntype,
			wValue, wIndex, buf, wLength);
		/* dump_stack(); */
		result = -ENOSYS;
	}
	return result;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_control);

int wusbhc_rh_suspend(struct usb_hcd *usb_hcd)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
		usb_hcd, wusbhc);
	/* dump_stack(); */
	return -ENOSYS;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_suspend);

int wusbhc_rh_resume(struct usb_hcd *usb_hcd)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
		usb_hcd, wusbhc);
	/* dump_stack(); */
	return -ENOSYS;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_resume);

int wusbhc_rh_start_port_reset(struct usb_hcd *usb_hcd, unsigned port_idx)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	dev_err(wusbhc->dev, "%s (%p [%p], port_idx %u) UNIMPLEMENTED\n",
		__func__, usb_hcd, wusbhc, port_idx);
	WARN_ON(1);
	return -ENOSYS;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_start_port_reset);

static void wusb_port_init(struct wusb_port *port)
{
	port->status |= USB_PORT_STAT_HIGH_SPEED;
}

/*
 * Alloc fake port specific fields and status.
 */
int wusbhc_rh_create(struct wusbhc *wusbhc)
{
	int result = -ENOMEM;
	size_t port_size, itr;
	port_size = wusbhc->ports_max * sizeof(wusbhc->port[0]);
	wusbhc->port = kzalloc(port_size, GFP_KERNEL);
	if (wusbhc->port == NULL)
		goto error_port_alloc;
	for (itr = 0; itr < wusbhc->ports_max; itr++)
		wusb_port_init(&wusbhc->port[itr]);
	result = 0;
error_port_alloc:
	return result;
}

void wusbhc_rh_destroy(struct wusbhc *wusbhc)
{
	kfree(wusbhc->port);
}
Commit	Line	Data
90ff96f2 IPG	1	/*
	2	* Wireless USB Host Controller
	3	* Root Hub operations
	4	*
	5	*
	6	* Copyright (C) 2005-2006 Intel Corporation
	7	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License version
	11	* 2 as published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	21	* 02110-1301, USA.
	22	*
	23	*
	24	* We fake a root hub that has fake ports (as many as simultaneous
	25	* devices the Wireless USB Host Controller can deal with). For each
	26	* port we keep an state in @wusbhc->port[index] identical to the one
	27	* specified in the USB2.0[ch11] spec and some extra device
	28	* information that complements the one in 'struct usb_device' (as
	29	* this lacs a hcpriv pointer).
	30	*
	31	* Note this is common to WHCI and HWA host controllers.
	32	*
	33	* Through here we enable most of the state changes that the USB stack
	34	* will use to connect or disconnect devices. We need to do some
	35	* forced adaptation of Wireless USB device states vs. wired:
	36	*
	37	* USB: WUSB:
	38	*
	39	* Port Powered-off port slot n/a
	40	* Powered-on port slot available
	41	* Disconnected port slot available
	42	* Connected port slot assigned device
	43	* device sent DN_Connect
	44	* device was authenticated
	45	* Enabled device is authenticated, transitioned
	46	* from unauth -> auth -> default address
	47	* -> enabled
	48	* Reset disconnect
	49	* Disable disconnect
	50	*
	51	* This maps the standard USB port states with the WUSB device states
	52	* so we can fake ports without having to modify the USB stack.
	53	*
	54	* FIXME: this process will change in the future
	55	*
	56	*
	57	* ENTRY POINTS
	58	*
	59	* Our entry points into here are, as in hcd.c, the USB stack root hub
	60	* ops defined in the usb_hcd struct:
	61	*
	62	* wusbhc_rh_status_data() Provide hub and port status data bitmap
	63	*
	64	* wusbhc_rh_control() Execution of all the major requests
65	* you can do to a hub (Set\|Clear
66	* features, get descriptors, status, etc).
67	*
68	* wusbhc_rh_[suspend\|resume]() That
69	*
70	* wusbhc_rh_start_port_reset() ??? unimplemented
71	*/
72	#include "wusbhc.h"
73
90ff96f2 IPG	74	/*
	75	* Reset a fake port
	76	*
4656d5de DV	77	* Using a Reset Device IE is too heavyweight as it causes the device
	78	* to enter the UnConnected state and leave the cluster, this can mean
	79	* that when the device reconnects it is connected to a different fake
	80	* port.
90ff96f2	81	*
4656d5de DV	82	* Instead, reset authenticated devices with a SetAddress(0), followed
	83	* by a SetAddresss(AuthAddr).
	84	*
	85	* For unauthenticated devices just pretend to reset but do nothing.
	86	* If the device initialization continues to fail it will eventually
	87	* time out after TrustTimeout and enter the UnConnected state.
90ff96f2 IPG	88	*
	89	* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
	90	*
	91	* Supposedly we are the only thread accesing @wusbhc->port; in any
	92	* case, maybe we should move the mutex locking from
	93	* wusbhc_devconnect_auth() to here.
	94	*
	95	* @port_idx refers to the wusbhc's port index, not the USB port number
	96	*/
	97	static int wusbhc_rh_port_reset(struct wusbhc *wusbhc, u8 port_idx)
	98	{
	99	int result = 0;
	100	struct wusb_port *port = wusb_port_by_idx(wusbhc, port_idx);
4656d5de DV	101	struct wusb_dev *wusb_dev = port->wusb_dev;
	102
	103	port->status \|= USB_PORT_STAT_RESET;
	104	port->change \|= USB_PORT_STAT_C_RESET;
90ff96f2	105
4656d5de DV	106	if (wusb_dev->addr & WUSB_DEV_ADDR_UNAUTH)
4656d5de DV	107	result = 0;
90ff96f2	108	else
4656d5de DV	109	result = wusb_dev_update_address(wusbhc, wusb_dev);
	110
	111	port->status &= ~USB_PORT_STAT_RESET;
	112	port->status \|= USB_PORT_STAT_ENABLE;
	113	port->change \|= USB_PORT_STAT_C_RESET \| USB_PORT_STAT_C_ENABLE;
	114
90ff96f2 IPG	115	return result;
	116	}
	117
	118	/*
	119	* Return the hub change status bitmap
	120	*
	121	* The bits in the change status bitmap are cleared when a
	122	* ClearPortFeature request is issued (USB2.0[11.12.3,11.12.4].
	123	*
	124	* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
	125	*
	126	* WARNING!! This gets called from atomic context; we cannot get the
	127	* mutex--the only race condition we can find is some bit
	128	* changing just after we copy it, which shouldn't be too
	129	* big of a problem [and we can't make it an spinlock
	130	* because other parts need to take it and sleep] .
	131	*
	132	* @usb_hcd is refcounted, so it won't dissapear under us
	133	* and before killing a host, the polling of the root hub
	134	* would be stopped anyway.
	135	*/
	136	int wusbhc_rh_status_data(struct usb_hcd usb_hcd, char _buf)
	137	{
	138	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	139	size_t cnt, size;
	140	unsigned long buf = (unsigned long ) _buf;
	141
90ff96f2 IPG	142	/* WE DON'T LOCK, see comment */
	143	size = wusbhc->ports_max + 1 /* hub bit */;
	144	size = (size + 8 - 1) / 8; /* round to bytes */
	145	for (cnt = 0; cnt < wusbhc->ports_max; cnt++)
	146	if (wusb_port_by_idx(wusbhc, cnt)->change)
	147	set_bit(cnt + 1, buf);
	148	else
	149	clear_bit(cnt + 1, buf);
90ff96f2 IPG	150	return size;
	151	}
	152	EXPORT_SYMBOL_GPL(wusbhc_rh_status_data);
	153
	154	/*
	155	* Return the hub's desciptor
	156	*
	157	* NOTE: almost cut and paste from ehci-hub.c
	158	*
	159	* @wusbhc is assumed referenced and @wusbhc->mutex unlocked
	160	*/
	161	static int wusbhc_rh_get_hub_descr(struct wusbhc *wusbhc, u16 wValue,
	162	u16 wIndex,
	163	struct usb_hub_descriptor *descr,
	164	u16 wLength)
	165	{
	166	u16 temp = 1 + (wusbhc->ports_max / 8);
	167	u8 length = 7 + 2 * temp;
	168
	169	if (wLength < length)
	170	return -ENOSPC;
	171	descr->bDescLength = 7 + 2 * temp;
	172	descr->bDescriptorType = 0x29; /* HUB type */
	173	descr->bNbrPorts = wusbhc->ports_max;
	174	descr->wHubCharacteristics = cpu_to_le16(
	175	0x00 /* All ports power at once */
	176	\| 0x00 /* not part of compound device */
	177	\| 0x10 /* No overcurrent protection */
	178	\| 0x00 /* 8 FS think time FIXME ?? */
	179	\| 0x00); /* No port indicators */
	180	descr->bPwrOn2PwrGood = 0;
	181	descr->bHubContrCurrent = 0;
	182	/* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
	183	memset(&descr->bitmap[0], 0, temp);
	184	memset(&descr->bitmap[temp], 0xff, temp);
	185	return 0;
	186	}
	187
	188	/*
	189	* Clear a hub feature
	190	*
	191	* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
	192	*
	193	* Nothing to do, so no locking needed ;)
	194	*/
	195	static int wusbhc_rh_clear_hub_feat(struct wusbhc *wusbhc, u16 feature)
	196	{
	197	int result;
90ff96f2	198
90ff96f2 IPG	199	switch (feature) {
	200	case C_HUB_LOCAL_POWER:
	201	/* FIXME: maybe plug bit 0 to the power input status,
	202	* if any?
	203	* see wusbhc_rh_get_hub_status() */
	204	case C_HUB_OVER_CURRENT:
	205	result = 0;
	206	break;
	207	default:
	208	result = -EPIPE;
	209	}
90ff96f2 IPG	210	return result;
	211	}
	212
	213	/*
	214	* Return hub status (it is always zero...)
	215	*
	216	* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
	217	*
	218	* Nothing to do, so no locking needed ;)
	219	*/
	220	static int wusbhc_rh_get_hub_status(struct wusbhc wusbhc, u32 buf,
	221	u16 wLength)
	222	{
	223	/* FIXME: maybe plug bit 0 to the power input status (if any)? */
	224	*buf = 0;
	225	return 0;
	226	}
	227
	228	/*
	229	* Set a port feature
	230	*
	231	* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
	232	*/
	233	static int wusbhc_rh_set_port_feat(struct wusbhc *wusbhc, u16 feature,
	234	u8 selector, u8 port_idx)
	235	{
90ff96f2 IPG	236	struct device *dev = wusbhc->dev;
90ff96f2 IPG	237
90ff96f2	238	if (port_idx > wusbhc->ports_max)
bce83697	239	return -EINVAL;
90ff96f2 IPG	240
	241	switch (feature) {
	242	/* According to USB2.0[11.24.2.13]p2, these features
	243	* are not required to be implemented. */
	244	case USB_PORT_FEAT_C_OVER_CURRENT:
	245	case USB_PORT_FEAT_C_ENABLE:
	246	case USB_PORT_FEAT_C_SUSPEND:
	247	case USB_PORT_FEAT_C_CONNECTION:
	248	case USB_PORT_FEAT_C_RESET:
bce83697	249	return 0;
90ff96f2 IPG	250	case USB_PORT_FEAT_POWER:
	251	/* No such thing, but we fake it works */
	252	mutex_lock(&wusbhc->mutex);
	253	wusb_port_by_idx(wusbhc, port_idx)->status \|= USB_PORT_STAT_POWER;
	254	mutex_unlock(&wusbhc->mutex);
bce83697	255	return 0;
90ff96f2	256	case USB_PORT_FEAT_RESET:
bce83697	257	return wusbhc_rh_port_reset(wusbhc, port_idx);
90ff96f2 IPG	258	case USB_PORT_FEAT_ENABLE:
	259	case USB_PORT_FEAT_SUSPEND:
	260	dev_err(dev, "(port_idx %d) set feat %d/%d UNIMPLEMENTED\n",
	261	port_idx, feature, selector);
bce83697	262	return -ENOSYS;
90ff96f2 IPG	263	default:
	264	dev_err(dev, "(port_idx %d) set feat %d/%d UNKNOWN\n",
	265	port_idx, feature, selector);
bce83697	266	return -EPIPE;
90ff96f2	267	}
bce83697 DV	268
bce83697 DV	269	return 0;
90ff96f2 IPG	270	}
	271
	272	/*
	273	* Clear a port feature...
	274	*
	275	* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
	276	*/
	277	static int wusbhc_rh_clear_port_feat(struct wusbhc *wusbhc, u16 feature,
	278	u8 selector, u8 port_idx)
	279	{
bce83697	280	int result = 0;
90ff96f2 IPG	281	struct device *dev = wusbhc->dev;
90ff96f2 IPG	282
90ff96f2	283	if (port_idx > wusbhc->ports_max)
bce83697	284	return -EINVAL;
90ff96f2 IPG	285
90ff96f2 IPG	286	mutex_lock(&wusbhc->mutex);
90ff96f2 IPG	287	switch (feature) {
	288	case USB_PORT_FEAT_POWER: /* fake port always on */
	289	/* According to USB2.0[11.24.2.7.1.4], no need to implement? */
	290	case USB_PORT_FEAT_C_OVER_CURRENT:
	291	break;
	292	case USB_PORT_FEAT_C_RESET:
	293	wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_RESET;
	294	break;
	295	case USB_PORT_FEAT_C_CONNECTION:
	296	wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_CONNECTION;
	297	break;
	298	case USB_PORT_FEAT_ENABLE:
	299	__wusbhc_dev_disable(wusbhc, port_idx);
	300	break;
	301	case USB_PORT_FEAT_C_ENABLE:
	302	wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_ENABLE;
	303	break;
	304	case USB_PORT_FEAT_SUSPEND:
	305	case USB_PORT_FEAT_C_SUSPEND:
90ff96f2 IPG	306	dev_err(dev, "(port_idx %d) Clear feat %d/%d UNIMPLEMENTED\n",
90ff96f2 IPG	307	port_idx, feature, selector);
90ff96f2 IPG	308	result = -ENOSYS;
	309	break;
	310	default:
	311	dev_err(dev, "(port_idx %d) Clear feat %d/%d UNKNOWN\n",
	312	port_idx, feature, selector);
	313	result = -EPIPE;
	314	break;
	315	}
	316	mutex_unlock(&wusbhc->mutex);
bce83697	317
90ff96f2 IPG	318	return result;
	319	}
	320
	321	/*
	322	* Return the port's status
	323	*
	324	* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
	325	*/
	326	static int wusbhc_rh_get_port_status(struct wusbhc *wusbhc, u16 port_idx,
	327	u32 *_buf, u16 wLength)
	328	{
90ff96f2 IPG	329	u16 buf = (u16 ) _buf;
90ff96f2 IPG	330
90ff96f2	331	if (port_idx > wusbhc->ports_max)
bce83697 DV	332	return -EINVAL;
bce83697 DV	333
90ff96f2 IPG	334	mutex_lock(&wusbhc->mutex);
	335	buf[0] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->status);
	336	buf[1] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->change);
90ff96f2	337	mutex_unlock(&wusbhc->mutex);
bce83697 DV	338
bce83697 DV	339	return 0;
90ff96f2 IPG	340	}
	341
	342	/*
	343	* Entry point for Root Hub operations
	344	*
	345	* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
	346	*/
	347	int wusbhc_rh_control(struct usb_hcd *usb_hcd, u16 reqntype, u16 wValue,
	348	u16 wIndex, char *buf, u16 wLength)
	349	{
	350	int result = -ENOSYS;
	351	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	352
	353	switch (reqntype) {
	354	case GetHubDescriptor:
	355	result = wusbhc_rh_get_hub_descr(
	356	wusbhc, wValue, wIndex,
	357	(struct usb_hub_descriptor *) buf, wLength);
	358	break;
	359	case ClearHubFeature:
	360	result = wusbhc_rh_clear_hub_feat(wusbhc, wValue);
	361	break;
	362	case GetHubStatus:
	363	result = wusbhc_rh_get_hub_status(wusbhc, (u32 *)buf, wLength);
	364	break;
	365
	366	case SetPortFeature:
	367	result = wusbhc_rh_set_port_feat(wusbhc, wValue, wIndex >> 8,
	368	(wIndex & 0xff) - 1);
	369	break;
	370	case ClearPortFeature:
	371	result = wusbhc_rh_clear_port_feat(wusbhc, wValue, wIndex >> 8,
	372	(wIndex & 0xff) - 1);
	373	break;
	374	case GetPortStatus:
	375	result = wusbhc_rh_get_port_status(wusbhc, wIndex - 1,
	376	(u32 *)buf, wLength);
	377	break;
	378
	379	case SetHubFeature:
	380	default:
	381	dev_err(wusbhc->dev, "%s (%p [%p], %x, %x, %x, %p, %x) "
	382	"UNIMPLEMENTED\n", __func__, usb_hcd, wusbhc, reqntype,
	383	wValue, wIndex, buf, wLength);
	384	/* dump_stack(); */
	385	result = -ENOSYS;
	386	}
	387	return result;
	388	}
	389	EXPORT_SYMBOL_GPL(wusbhc_rh_control);
	390
	391	int wusbhc_rh_suspend(struct usb_hcd *usb_hcd)
	392	{
	393	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	394	dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
	395	usb_hcd, wusbhc);
	396	/* dump_stack(); */
	397	return -ENOSYS;
	398	}
	399	EXPORT_SYMBOL_GPL(wusbhc_rh_suspend);
	400
	401	int wusbhc_rh_resume(struct usb_hcd *usb_hcd)
	402	{
	403	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
404	dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
405	usb_hcd, wusbhc);
406	/* dump_stack(); */
407	return -ENOSYS;
408	}
409	EXPORT_SYMBOL_GPL(wusbhc_rh_resume);
410
411	int wusbhc_rh_start_port_reset(struct usb_hcd *usb_hcd, unsigned port_idx)
412	{
413	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
414	dev_err(wusbhc->dev, "%s (%p [%p], port_idx %u) UNIMPLEMENTED\n",
415	__func__, usb_hcd, wusbhc, port_idx);
416	WARN_ON(1);
417	return -ENOSYS;
418	}
419	EXPORT_SYMBOL_GPL(wusbhc_rh_start_port_reset);
420
421	static void wusb_port_init(struct wusb_port *port)
422	{
423	port->status \|= USB_PORT_STAT_HIGH_SPEED;
424	}
425
426	/*
427	* Alloc fake port specific fields and status.
428	*/
429	int wusbhc_rh_create(struct wusbhc *wusbhc)
430	{
431	int result = -ENOMEM;
432	size_t port_size, itr;
433	port_size = wusbhc->ports_max * sizeof(wusbhc->port[0]);
434	wusbhc->port = kzalloc(port_size, GFP_KERNEL);
435	if (wusbhc->port == NULL)
436	goto error_port_alloc;
437	for (itr = 0; itr < wusbhc->ports_max; itr++)
438	wusb_port_init(&wusbhc->port[itr]);
439	result = 0;
440	error_port_alloc:
441	return result;
442	}
443
444	void wusbhc_rh_destroy(struct wusbhc *wusbhc)
445	{
446	kfree(wusbhc->port);
447	}