f061f43d74
In some cases the port of an hub needs to be disabled or switched off and on again. E.g. when the connected device needs to be re-enumerated. Or it needs to be explicitly disabled while the rest of the usb tree stays working. For this purpose this patch adds an sysfs switch to enable/disable the port on any hub. In the case the hub is supporting power switching, the power line will be disabled to the connected device. When the port gets disabled, the associated device gets disconnected and removed from the logical usb tree. No further device will be enumerated on that port until the port gets enabled again. Reviewed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de> Link: https://lore.kernel.org/r/20220607114522.3359148-1-m.grzeschik@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
171 lines
5.1 KiB
C
171 lines
5.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* usb hub driver head file
|
|
*
|
|
* Copyright (C) 1999 Linus Torvalds
|
|
* Copyright (C) 1999 Johannes Erdfelt
|
|
* Copyright (C) 1999 Gregory P. Smith
|
|
* Copyright (C) 2001 Brad Hards (bhards@bigpond.net.au)
|
|
* Copyright (C) 2012 Intel Corp (tianyu.lan@intel.com)
|
|
*
|
|
* move struct usb_hub to this file.
|
|
*/
|
|
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/ch11.h>
|
|
#include <linux/usb/hcd.h>
|
|
#include "usb.h"
|
|
|
|
struct usb_hub {
|
|
struct device *intfdev; /* the "interface" device */
|
|
struct usb_device *hdev;
|
|
struct kref kref;
|
|
struct urb *urb; /* for interrupt polling pipe */
|
|
|
|
/* buffer for urb ... with extra space in case of babble */
|
|
u8 (*buffer)[8];
|
|
union {
|
|
struct usb_hub_status hub;
|
|
struct usb_port_status port;
|
|
} *status; /* buffer for status reports */
|
|
struct mutex status_mutex; /* for the status buffer */
|
|
|
|
int error; /* last reported error */
|
|
int nerrors; /* track consecutive errors */
|
|
|
|
unsigned long event_bits[1]; /* status change bitmask */
|
|
unsigned long change_bits[1]; /* ports with logical connect
|
|
status change */
|
|
unsigned long removed_bits[1]; /* ports with a "removed"
|
|
device present */
|
|
unsigned long wakeup_bits[1]; /* ports that have signaled
|
|
remote wakeup */
|
|
unsigned long power_bits[1]; /* ports that are powered */
|
|
unsigned long child_usage_bits[1]; /* ports powered on for
|
|
children */
|
|
unsigned long warm_reset_bits[1]; /* ports requesting warm
|
|
reset recovery */
|
|
#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
|
|
#error event_bits[] is too short!
|
|
#endif
|
|
|
|
struct usb_hub_descriptor *descriptor; /* class descriptor */
|
|
struct usb_tt tt; /* Transaction Translator */
|
|
|
|
unsigned mA_per_port; /* current for each child */
|
|
#ifdef CONFIG_PM
|
|
unsigned wakeup_enabled_descendants;
|
|
#endif
|
|
|
|
unsigned limited_power:1;
|
|
unsigned quiescing:1;
|
|
unsigned disconnected:1;
|
|
unsigned in_reset:1;
|
|
unsigned quirk_disable_autosuspend:1;
|
|
|
|
unsigned quirk_check_port_auto_suspend:1;
|
|
|
|
unsigned has_indicators:1;
|
|
u8 indicator[USB_MAXCHILDREN];
|
|
struct delayed_work leds;
|
|
struct delayed_work init_work;
|
|
struct work_struct events;
|
|
spinlock_t irq_urb_lock;
|
|
struct timer_list irq_urb_retry;
|
|
struct usb_port **ports;
|
|
};
|
|
|
|
/**
|
|
* struct usb port - kernel's representation of a usb port
|
|
* @child: usb device attached to the port
|
|
* @dev: generic device interface
|
|
* @port_owner: port's owner
|
|
* @peer: related usb2 and usb3 ports (share the same connector)
|
|
* @req: default pm qos request for hubs without port power control
|
|
* @connect_type: port's connect type
|
|
* @location: opaque representation of platform connector location
|
|
* @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
|
|
* @portnum: port index num based one
|
|
* @is_superspeed cache super-speed status
|
|
* @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
|
|
* @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
|
|
*/
|
|
struct usb_port {
|
|
struct usb_device *child;
|
|
struct device dev;
|
|
struct usb_dev_state *port_owner;
|
|
struct usb_port *peer;
|
|
struct dev_pm_qos_request *req;
|
|
enum usb_port_connect_type connect_type;
|
|
usb_port_location_t location;
|
|
struct mutex status_lock;
|
|
u32 over_current_count;
|
|
u8 portnum;
|
|
u32 quirks;
|
|
unsigned int is_superspeed:1;
|
|
unsigned int usb3_lpm_u1_permit:1;
|
|
unsigned int usb3_lpm_u2_permit:1;
|
|
};
|
|
|
|
#define to_usb_port(_dev) \
|
|
container_of(_dev, struct usb_port, dev)
|
|
|
|
extern int usb_hub_create_port_device(struct usb_hub *hub,
|
|
int port1);
|
|
extern void usb_hub_remove_port_device(struct usb_hub *hub,
|
|
int port1);
|
|
extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
|
|
int port1, bool set);
|
|
extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev);
|
|
extern int hub_port_debounce(struct usb_hub *hub, int port1,
|
|
bool must_be_connected);
|
|
extern int usb_clear_port_feature(struct usb_device *hdev,
|
|
int port1, int feature);
|
|
extern int usb_hub_port_status(struct usb_hub *hub, int port1,
|
|
u16 *status, u16 *change);
|
|
extern int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus);
|
|
|
|
static inline bool hub_is_port_power_switchable(struct usb_hub *hub)
|
|
{
|
|
__le16 hcs;
|
|
|
|
if (!hub)
|
|
return false;
|
|
hcs = hub->descriptor->wHubCharacteristics;
|
|
return (le16_to_cpu(hcs) & HUB_CHAR_LPSM) < HUB_CHAR_NO_LPSM;
|
|
}
|
|
|
|
static inline int hub_is_superspeed(struct usb_device *hdev)
|
|
{
|
|
return hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS;
|
|
}
|
|
|
|
static inline int hub_is_superspeedplus(struct usb_device *hdev)
|
|
{
|
|
return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS &&
|
|
le16_to_cpu(hdev->descriptor.bcdUSB) >= 0x0310 &&
|
|
hdev->bos->ssp_cap);
|
|
}
|
|
|
|
static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
|
|
{
|
|
unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
|
|
|
|
if (!hub->hdev->parent) /* root hub */
|
|
return delay;
|
|
else /* Wait at least 100 msec for power to become stable */
|
|
return max(delay, 100U);
|
|
}
|
|
|
|
static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
|
|
int port1)
|
|
{
|
|
return hub_port_debounce(hub, port1, true);
|
|
}
|
|
|
|
static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
|
|
int port1)
|
|
{
|
|
return hub_port_debounce(hub, port1, false);
|
|
}
|