169 lines
5.1 KiB
C
169 lines
5.1 KiB
C
/*
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* usb hub driver head file
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*
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* Copyright (C) 1999 Linus Torvalds
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* Copyright (C) 1999 Johannes Erdfelt
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* Copyright (C) 1999 Gregory P. Smith
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* Copyright (C) 2001 Brad Hards (bhards@bigpond.net.au)
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* Copyright (C) 2012 Intel Corp (tianyu.lan@intel.com)
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*
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* move struct usb_hub to this file.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <linux/usb.h>
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#include <linux/usb/ch11.h>
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#include <linux/usb/hcd.h>
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#include "usb.h"
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struct usb_hub {
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struct device *intfdev; /* the "interface" device */
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struct usb_device *hdev;
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struct kref kref;
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struct urb *urb; /* for interrupt polling pipe */
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/* buffer for urb ... with extra space in case of babble */
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u8 (*buffer)[8];
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union {
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struct usb_hub_status hub;
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struct usb_port_status port;
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} *status; /* buffer for status reports */
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struct mutex status_mutex; /* for the status buffer */
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int error; /* last reported error */
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int nerrors; /* track consecutive errors */
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unsigned long event_bits[1]; /* status change bitmask */
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unsigned long change_bits[1]; /* ports with logical connect
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status change */
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unsigned long removed_bits[1]; /* ports with a "removed"
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device present */
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unsigned long wakeup_bits[1]; /* ports that have signaled
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remote wakeup */
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unsigned long power_bits[1]; /* ports that are powered */
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unsigned long child_usage_bits[1]; /* ports powered on for
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children */
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unsigned long warm_reset_bits[1]; /* ports requesting warm
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reset recovery */
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#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
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#error event_bits[] is too short!
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#endif
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struct usb_hub_descriptor *descriptor; /* class descriptor */
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struct usb_tt tt; /* Transaction Translator */
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unsigned mA_per_port; /* current for each child */
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#ifdef CONFIG_PM
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unsigned wakeup_enabled_descendants;
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#endif
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unsigned limited_power:1;
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unsigned quiescing:1;
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unsigned disconnected:1;
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unsigned in_reset:1;
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unsigned quirk_check_port_auto_suspend:1;
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unsigned has_indicators:1;
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u8 indicator[USB_MAXCHILDREN];
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struct delayed_work leds;
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struct delayed_work init_work;
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struct work_struct events;
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struct usb_port **ports;
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};
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/**
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* struct usb port - kernel's representation of a usb port
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* @child: usb device attached to the port
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* @dev: generic device interface
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* @port_owner: port's owner
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* @peer: related usb2 and usb3 ports (share the same connector)
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* @req: default pm qos request for hubs without port power control
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* @connect_type: port's connect type
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* @location: opaque representation of platform connector location
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* @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
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* @portnum: port index num based one
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* @is_superspeed cache super-speed status
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* @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
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* @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
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*/
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struct usb_port {
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struct usb_device *child;
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struct device dev;
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struct usb_dev_state *port_owner;
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struct usb_port *peer;
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struct dev_pm_qos_request *req;
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enum usb_port_connect_type connect_type;
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usb_port_location_t location;
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struct mutex status_lock;
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u8 portnum;
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unsigned int is_superspeed:1;
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unsigned int usb3_lpm_u1_permit:1;
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unsigned int usb3_lpm_u2_permit:1;
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};
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#define to_usb_port(_dev) \
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container_of(_dev, struct usb_port, dev)
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extern int usb_hub_create_port_device(struct usb_hub *hub,
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int port1);
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extern void usb_hub_remove_port_device(struct usb_hub *hub,
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int port1);
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extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
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int port1, bool set);
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extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev);
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extern int hub_port_debounce(struct usb_hub *hub, int port1,
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bool must_be_connected);
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extern int usb_clear_port_feature(struct usb_device *hdev,
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int port1, int feature);
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static inline bool hub_is_port_power_switchable(struct usb_hub *hub)
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{
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__le16 hcs;
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if (!hub)
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return false;
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hcs = hub->descriptor->wHubCharacteristics;
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return (le16_to_cpu(hcs) & HUB_CHAR_LPSM) < HUB_CHAR_NO_LPSM;
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}
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static inline int hub_is_superspeed(struct usb_device *hdev)
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{
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return hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS;
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}
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static inline int hub_is_superspeedplus(struct usb_device *hdev)
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{
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return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS &&
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le16_to_cpu(hdev->descriptor.bcdUSB) >= 0x0310 &&
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hdev->bos->ssp_cap);
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}
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static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
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{
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unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
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/* Wait at least 100 msec for power to become stable */
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return max(delay, 100U);
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}
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static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
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int port1)
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{
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return hub_port_debounce(hub, port1, true);
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}
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static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
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int port1)
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{
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return hub_port_debounce(hub, port1, false);
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}
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