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For some userspace applications information on the number of over-current conditions at specific USB hub ports is relevant. In our case we have a series of USB hardware (using the cp210x driver) which communicates using a proprietary protocol. These devices sometimes trigger an over-current situation on some hubs. In case of such an over-current situation the USB devices offer an interface for reducing the max used power. As these conditions are quite rare and imply performance reductions of the device we don't want to reduce the max power always. Therefore give user-space applications the possibility to react adequately by introducing an over_current_counter in the usb port struct which is exported via sysfs. Signed-off-by: Richard Leitner <richard.leitner@skidata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
162 lines
4.7 KiB
C
162 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#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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u32 over_current_count;
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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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