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linux/drivers/usb/wusbcore/rh.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Wireless USB Host Controller
* Root Hub operations
*
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* 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 <linux/slab.h>
#include <linux/export.h>
#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;
if (wusb_dev == NULL)
return -ENOTCONN;
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 disappear 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, bits_set = 0;
/* WE DON'T LOCK, see comment */
/* round up to bytes. Hub bit is bit 0 so add 1. */
size = DIV_ROUND_UP(wusbhc->ports_max + 1, 8);
/* clear the output buffer. */
memset(_buf, 0, size);
/* set the bit for each changed port. */
for (cnt = 0; cnt < wusbhc->ports_max; cnt++) {
if (wusb_port_by_idx(wusbhc, cnt)->change) {
const int bitpos = cnt+1;
_buf[bitpos/8] |= (1 << (bitpos % 8));
bits_set++;
}
}
return bits_set ? size : 0;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_status_data);
/*
* Return the hub's descriptor
*
* 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 = USB_DT_HUB; /* HUB type */
descr->bNbrPorts = wusbhc->ports_max;
descr->wHubCharacteristics = cpu_to_le16(
HUB_CHAR_COMMON_LPSM /* All ports power at once */
| 0x00 /* not part of compound device */
| HUB_CHAR_NO_OCPM /* 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->u.hs.DeviceRemovable[0], 0, temp);
memset(&descr->u.hs.DeviceRemovable[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)
{
__le16 *buf = (__le16 *)_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_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);
}
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