427 lines
12 KiB
C
427 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Wireless USB Host Controller
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* Root Hub operations
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*
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* We fake a root hub that has fake ports (as many as simultaneous
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* devices the Wireless USB Host Controller can deal with). For each
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* port we keep an state in @wusbhc->port[index] identical to the one
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* specified in the USB2.0[ch11] spec and some extra device
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* information that complements the one in 'struct usb_device' (as
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* this lacs a hcpriv pointer).
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*
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* Note this is common to WHCI and HWA host controllers.
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*
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* Through here we enable most of the state changes that the USB stack
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* will use to connect or disconnect devices. We need to do some
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* forced adaptation of Wireless USB device states vs. wired:
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*
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* USB: WUSB:
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*
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* Port Powered-off port slot n/a
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* Powered-on port slot available
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* Disconnected port slot available
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* Connected port slot assigned device
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* device sent DN_Connect
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* device was authenticated
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* Enabled device is authenticated, transitioned
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* from unauth -> auth -> default address
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* -> enabled
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* Reset disconnect
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* Disable disconnect
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*
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* This maps the standard USB port states with the WUSB device states
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* so we can fake ports without having to modify the USB stack.
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*
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* FIXME: this process will change in the future
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*
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*
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* ENTRY POINTS
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*
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* Our entry points into here are, as in hcd.c, the USB stack root hub
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* ops defined in the usb_hcd struct:
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*
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* wusbhc_rh_status_data() Provide hub and port status data bitmap
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*
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* wusbhc_rh_control() Execution of all the major requests
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* you can do to a hub (Set|Clear
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* features, get descriptors, status, etc).
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*
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* wusbhc_rh_[suspend|resume]() That
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*
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* wusbhc_rh_start_port_reset() ??? unimplemented
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*/
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#include <linux/slab.h>
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#include <linux/export.h>
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#include "wusbhc.h"
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/*
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* Reset a fake port
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*
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* Using a Reset Device IE is too heavyweight as it causes the device
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* to enter the UnConnected state and leave the cluster, this can mean
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* that when the device reconnects it is connected to a different fake
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* port.
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*
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* Instead, reset authenticated devices with a SetAddress(0), followed
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* by a SetAddresss(AuthAddr).
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*
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* For unauthenticated devices just pretend to reset but do nothing.
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* If the device initialization continues to fail it will eventually
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* time out after TrustTimeout and enter the UnConnected state.
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*
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* Supposedly we are the only thread accesing @wusbhc->port; in any
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* case, maybe we should move the mutex locking from
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* wusbhc_devconnect_auth() to here.
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*
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* @port_idx refers to the wusbhc's port index, not the USB port number
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*/
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static int wusbhc_rh_port_reset(struct wusbhc *wusbhc, u8 port_idx)
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{
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int result = 0;
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struct wusb_port *port = wusb_port_by_idx(wusbhc, port_idx);
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struct wusb_dev *wusb_dev = port->wusb_dev;
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if (wusb_dev == NULL)
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return -ENOTCONN;
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port->status |= USB_PORT_STAT_RESET;
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port->change |= USB_PORT_STAT_C_RESET;
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if (wusb_dev->addr & WUSB_DEV_ADDR_UNAUTH)
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result = 0;
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else
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result = wusb_dev_update_address(wusbhc, wusb_dev);
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port->status &= ~USB_PORT_STAT_RESET;
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port->status |= USB_PORT_STAT_ENABLE;
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port->change |= USB_PORT_STAT_C_RESET | USB_PORT_STAT_C_ENABLE;
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return result;
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}
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/*
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* Return the hub change status bitmap
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*
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* The bits in the change status bitmap are cleared when a
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* ClearPortFeature request is issued (USB2.0[11.12.3,11.12.4].
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*
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* WARNING!! This gets called from atomic context; we cannot get the
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* mutex--the only race condition we can find is some bit
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* changing just after we copy it, which shouldn't be too
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* big of a problem [and we can't make it an spinlock
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* because other parts need to take it and sleep] .
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*
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* @usb_hcd is refcounted, so it won't disappear under us
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* and before killing a host, the polling of the root hub
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* would be stopped anyway.
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*/
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int wusbhc_rh_status_data(struct usb_hcd *usb_hcd, char *_buf)
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{
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struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
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size_t cnt, size, bits_set = 0;
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/* WE DON'T LOCK, see comment */
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/* round up to bytes. Hub bit is bit 0 so add 1. */
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size = DIV_ROUND_UP(wusbhc->ports_max + 1, 8);
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/* clear the output buffer. */
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memset(_buf, 0, size);
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/* set the bit for each changed port. */
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for (cnt = 0; cnt < wusbhc->ports_max; cnt++) {
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if (wusb_port_by_idx(wusbhc, cnt)->change) {
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const int bitpos = cnt+1;
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_buf[bitpos/8] |= (1 << (bitpos % 8));
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bits_set++;
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}
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}
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return bits_set ? size : 0;
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}
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EXPORT_SYMBOL_GPL(wusbhc_rh_status_data);
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/*
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* Return the hub's descriptor
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*
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* NOTE: almost cut and paste from ehci-hub.c
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked
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*/
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static int wusbhc_rh_get_hub_descr(struct wusbhc *wusbhc, u16 wValue,
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u16 wIndex,
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struct usb_hub_descriptor *descr,
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u16 wLength)
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{
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u16 temp = 1 + (wusbhc->ports_max / 8);
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u8 length = 7 + 2 * temp;
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if (wLength < length)
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return -ENOSPC;
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descr->bDescLength = 7 + 2 * temp;
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descr->bDescriptorType = USB_DT_HUB; /* HUB type */
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descr->bNbrPorts = wusbhc->ports_max;
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descr->wHubCharacteristics = cpu_to_le16(
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HUB_CHAR_COMMON_LPSM /* All ports power at once */
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| 0x00 /* not part of compound device */
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| HUB_CHAR_NO_OCPM /* No overcurrent protection */
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| 0x00 /* 8 FS think time FIXME ?? */
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| 0x00); /* No port indicators */
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descr->bPwrOn2PwrGood = 0;
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descr->bHubContrCurrent = 0;
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/* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
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memset(&descr->u.hs.DeviceRemovable[0], 0, temp);
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memset(&descr->u.hs.DeviceRemovable[temp], 0xff, temp);
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return 0;
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}
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/*
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* Clear a hub feature
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*
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* Nothing to do, so no locking needed ;)
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*/
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static int wusbhc_rh_clear_hub_feat(struct wusbhc *wusbhc, u16 feature)
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{
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int result;
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switch (feature) {
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case C_HUB_LOCAL_POWER:
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/* FIXME: maybe plug bit 0 to the power input status,
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* if any?
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* see wusbhc_rh_get_hub_status() */
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case C_HUB_OVER_CURRENT:
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result = 0;
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break;
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default:
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result = -EPIPE;
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}
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return result;
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}
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/*
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* Return hub status (it is always zero...)
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*
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* Nothing to do, so no locking needed ;)
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*/
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static int wusbhc_rh_get_hub_status(struct wusbhc *wusbhc, u32 *buf,
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u16 wLength)
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{
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/* FIXME: maybe plug bit 0 to the power input status (if any)? */
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*buf = 0;
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return 0;
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}
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/*
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* Set a port feature
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*/
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static int wusbhc_rh_set_port_feat(struct wusbhc *wusbhc, u16 feature,
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u8 selector, u8 port_idx)
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{
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struct device *dev = wusbhc->dev;
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if (port_idx > wusbhc->ports_max)
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return -EINVAL;
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switch (feature) {
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/* According to USB2.0[11.24.2.13]p2, these features
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* are not required to be implemented. */
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case USB_PORT_FEAT_C_OVER_CURRENT:
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case USB_PORT_FEAT_C_ENABLE:
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case USB_PORT_FEAT_C_SUSPEND:
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case USB_PORT_FEAT_C_CONNECTION:
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case USB_PORT_FEAT_C_RESET:
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return 0;
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case USB_PORT_FEAT_POWER:
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/* No such thing, but we fake it works */
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mutex_lock(&wusbhc->mutex);
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wusb_port_by_idx(wusbhc, port_idx)->status |= USB_PORT_STAT_POWER;
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mutex_unlock(&wusbhc->mutex);
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return 0;
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case USB_PORT_FEAT_RESET:
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return wusbhc_rh_port_reset(wusbhc, port_idx);
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case USB_PORT_FEAT_ENABLE:
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case USB_PORT_FEAT_SUSPEND:
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dev_err(dev, "(port_idx %d) set feat %d/%d UNIMPLEMENTED\n",
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port_idx, feature, selector);
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return -ENOSYS;
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default:
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dev_err(dev, "(port_idx %d) set feat %d/%d UNKNOWN\n",
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port_idx, feature, selector);
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return -EPIPE;
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}
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return 0;
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}
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/*
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* Clear a port feature...
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*/
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static int wusbhc_rh_clear_port_feat(struct wusbhc *wusbhc, u16 feature,
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u8 selector, u8 port_idx)
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{
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int result = 0;
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struct device *dev = wusbhc->dev;
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if (port_idx > wusbhc->ports_max)
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return -EINVAL;
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mutex_lock(&wusbhc->mutex);
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switch (feature) {
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case USB_PORT_FEAT_POWER: /* fake port always on */
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/* According to USB2.0[11.24.2.7.1.4], no need to implement? */
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case USB_PORT_FEAT_C_OVER_CURRENT:
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break;
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case USB_PORT_FEAT_C_RESET:
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wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_RESET;
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break;
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case USB_PORT_FEAT_C_CONNECTION:
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wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_CONNECTION;
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break;
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case USB_PORT_FEAT_ENABLE:
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__wusbhc_dev_disable(wusbhc, port_idx);
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break;
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case USB_PORT_FEAT_C_ENABLE:
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wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_ENABLE;
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break;
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case USB_PORT_FEAT_SUSPEND:
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case USB_PORT_FEAT_C_SUSPEND:
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dev_err(dev, "(port_idx %d) Clear feat %d/%d UNIMPLEMENTED\n",
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port_idx, feature, selector);
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result = -ENOSYS;
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break;
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default:
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dev_err(dev, "(port_idx %d) Clear feat %d/%d UNKNOWN\n",
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port_idx, feature, selector);
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result = -EPIPE;
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break;
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}
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mutex_unlock(&wusbhc->mutex);
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return result;
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}
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/*
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* Return the port's status
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*/
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static int wusbhc_rh_get_port_status(struct wusbhc *wusbhc, u16 port_idx,
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u32 *_buf, u16 wLength)
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{
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__le16 *buf = (__le16 *)_buf;
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if (port_idx > wusbhc->ports_max)
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return -EINVAL;
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mutex_lock(&wusbhc->mutex);
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buf[0] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->status);
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buf[1] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->change);
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mutex_unlock(&wusbhc->mutex);
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return 0;
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}
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/*
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* Entry point for Root Hub operations
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*
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* @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
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*/
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int wusbhc_rh_control(struct usb_hcd *usb_hcd, u16 reqntype, u16 wValue,
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u16 wIndex, char *buf, u16 wLength)
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{
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int result = -ENOSYS;
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struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
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switch (reqntype) {
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case GetHubDescriptor:
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result = wusbhc_rh_get_hub_descr(
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wusbhc, wValue, wIndex,
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(struct usb_hub_descriptor *) buf, wLength);
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break;
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case ClearHubFeature:
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result = wusbhc_rh_clear_hub_feat(wusbhc, wValue);
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break;
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case GetHubStatus:
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result = wusbhc_rh_get_hub_status(wusbhc, (u32 *)buf, wLength);
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break;
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case SetPortFeature:
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result = wusbhc_rh_set_port_feat(wusbhc, wValue, wIndex >> 8,
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(wIndex & 0xff) - 1);
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break;
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case ClearPortFeature:
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result = wusbhc_rh_clear_port_feat(wusbhc, wValue, wIndex >> 8,
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(wIndex & 0xff) - 1);
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break;
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case GetPortStatus:
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result = wusbhc_rh_get_port_status(wusbhc, wIndex - 1,
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(u32 *)buf, wLength);
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break;
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case SetHubFeature:
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default:
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dev_err(wusbhc->dev, "%s (%p [%p], %x, %x, %x, %p, %x) "
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"UNIMPLEMENTED\n", __func__, usb_hcd, wusbhc, reqntype,
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wValue, wIndex, buf, wLength);
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/* dump_stack(); */
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result = -ENOSYS;
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}
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return result;
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}
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EXPORT_SYMBOL_GPL(wusbhc_rh_control);
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int wusbhc_rh_start_port_reset(struct usb_hcd *usb_hcd, unsigned port_idx)
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{
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struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
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dev_err(wusbhc->dev, "%s (%p [%p], port_idx %u) UNIMPLEMENTED\n",
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__func__, usb_hcd, wusbhc, port_idx);
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WARN_ON(1);
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return -ENOSYS;
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}
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EXPORT_SYMBOL_GPL(wusbhc_rh_start_port_reset);
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static void wusb_port_init(struct wusb_port *port)
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{
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port->status |= USB_PORT_STAT_HIGH_SPEED;
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}
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/*
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* Alloc fake port specific fields and status.
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*/
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int wusbhc_rh_create(struct wusbhc *wusbhc)
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{
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int result = -ENOMEM;
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size_t port_size, itr;
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port_size = wusbhc->ports_max * sizeof(wusbhc->port[0]);
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wusbhc->port = kzalloc(port_size, GFP_KERNEL);
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if (wusbhc->port == NULL)
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goto error_port_alloc;
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for (itr = 0; itr < wusbhc->ports_max; itr++)
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wusb_port_init(&wusbhc->port[itr]);
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result = 0;
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error_port_alloc:
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return result;
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}
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void wusbhc_rh_destroy(struct wusbhc *wusbhc)
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{
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kfree(wusbhc->port);
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}
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