[mirror_ubuntu-jammy-kernel.git] / drivers / usb / core / hub.h

// 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.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */

#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_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;
	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;
	u8 portnum;
	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);

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;

	/* 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);
}
Commit	Line	Data
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0
6e30d7cb LT	2	/*
	3	* usb hub driver head file
	4	*
	5	* Copyright (C) 1999 Linus Torvalds
	6	* Copyright (C) 1999 Johannes Erdfelt
	7	* Copyright (C) 1999 Gregory P. Smith
	8	* Copyright (C) 2001 Brad Hards (bhards@bigpond.net.au)
	9	* Copyright (C) 2012 Intel Corp (tianyu.lan@intel.com)
	10	*
	11	* move struct usb_hub to this file.
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License version 2 as
	15	* published by the Free Software Foundation.
	16	*
	17	* This program is distributed in the hope that it will be useful, but
	18	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	19	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	20	* for more details.
	21	*/
	22
	23	#include <linux/usb.h>
	24	#include <linux/usb/ch11.h>
	25	#include <linux/usb/hcd.h>
	26	#include "usb.h"
	27
	28	struct usb_hub {
	29	struct device intfdev; / the "interface" device */
	30	struct usb_device *hdev;
	31	struct kref kref;
	32	struct urb urb; / for interrupt polling pipe */
	33
	34	/* buffer for urb ... with extra space in case of babble */
bdb6bc06	35	u8 (*buffer)[8];
6e30d7cb LT	36	union {
	37	struct usb_hub_status hub;
	38	struct usb_port_status port;
	39	} status; / buffer for status reports */
	40	struct mutex status_mutex; /* for the status buffer */
	41
	42	int error; /* last reported error */
	43	int nerrors; /* track consecutive errors */
	44
6e30d7cb LT	45	unsigned long event_bits[1]; /* status change bitmask */
	46	unsigned long change_bits[1]; /* ports with logical connect
	47	status change */
6e30d7cb LT	48	unsigned long removed_bits[1]; /* ports with a "removed"
	49	device present */
	50	unsigned long wakeup_bits[1]; /* ports that have signaled
	51	remote wakeup */
d5c3834e DW	52	unsigned long power_bits[1]; /* ports that are powered */
	53	unsigned long child_usage_bits[1]; /* ports powered on for
	54	children */
3cd12f91 DW	55	unsigned long warm_reset_bits[1]; /* ports requesting warm
3cd12f91 DW	56	reset recovery */
6e30d7cb LT	57	#if USB_MAXCHILDREN > 31 /* 8sizeof(unsigned long) - 1 /
	58	#error event_bits[] is too short!
	59	#endif
	60
	61	struct usb_hub_descriptor descriptor; / class descriptor */
	62	struct usb_tt tt; /* Transaction Translator */
	63
	64	unsigned mA_per_port; /* current for each child */
e583d9db AS	65	#ifdef CONFIG_PM
	66	unsigned wakeup_enabled_descendants;
	67	#endif
6e30d7cb LT	68
	69	unsigned limited_power:1;
	70	unsigned quiescing:1;
	71	unsigned disconnected:1;
600856c2	72	unsigned in_reset:1;
6e30d7cb LT	73
	74	unsigned quirk_check_port_auto_suspend:1;
	75
	76	unsigned has_indicators:1;
	77	u8 indicator[USB_MAXCHILDREN];
	78	struct delayed_work leds;
	79	struct delayed_work init_work;
32a69589	80	struct work_struct events;
6e30d7cb LT	81	struct usb_port **ports;
	82	};
	83
	84	/**
	85	* struct usb port - kernel's representation of a usb port
025d4430	86	* @child: usb device attached to the port
6e30d7cb LT	87	* @dev: generic device interface
6e30d7cb LT	88	* @port_owner: port's owner
d8521afe	89	* @peer: related usb2 and usb3 ports (share the same connector)
e3d10505	90	* @req: default pm qos request for hubs without port power control
6e30d7cb	91	* @connect_type: port's connect type
3bfd659b	92	* @location: opaque representation of platform connector location
5c79a1e3	93	* @status_lock: synchronize port_event() vs usb_port_{suspend\|resume}
971fcd49	94	* @portnum: port index num based one
7ad3c470	95	* @is_superspeed cache super-speed status
513072d9 LB	96	* @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
513072d9 LB	97	* @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
6e30d7cb LT	98	*/
	99	struct usb_port {
	100	struct usb_device *child;
	101	struct device dev;
9b6f0c4b	102	struct usb_dev_state *port_owner;
d8521afe	103	struct usb_port *peer;
e3d10505	104	struct dev_pm_qos_request *req;
6e30d7cb	105	enum usb_port_connect_type connect_type;
3bfd659b	106	usb_port_location_t location;
5c79a1e3	107	struct mutex status_lock;
971fcd49	108	u8 portnum;
7ad3c470	109	unsigned int is_superspeed:1;
513072d9 LB	110	unsigned int usb3_lpm_u1_permit:1;
513072d9 LB	111	unsigned int usb3_lpm_u2_permit:1;
6e30d7cb LT	112	};
	113
	114	#define to_usb_port(_dev) \
	115	container_of(_dev, struct usb_port, dev)
	116
	117	extern int usb_hub_create_port_device(struct usb_hub *hub,
	118	int port1);
	119	extern void usb_hub_remove_port_device(struct usb_hub *hub,
	120	int port1);
41341261	121	extern int usb_hub_set_port_power(struct usb_device hdev, struct usb_hub hub,
971fcd49	122	int port1, bool set);
ad493e5e LT	123	extern struct usb_hub usb_hub_to_struct_hub(struct usb_device hdev);
	124	extern int hub_port_debounce(struct usb_hub *hub, int port1,
	125	bool must_be_connected);
	126	extern int usb_clear_port_feature(struct usb_device *hdev,
	127	int port1, int feature);
	128
9262c19d DW	129	static inline bool hub_is_port_power_switchable(struct usb_hub *hub)
	130	{
	131	__le16 hcs;
	132
	133	if (!hub)
	134	return false;
	135	hcs = hub->descriptor->wHubCharacteristics;
	136	return (le16_to_cpu(hcs) & HUB_CHAR_LPSM) < HUB_CHAR_NO_LPSM;
	137	}
	138
7ad3c470 DW	139	static inline int hub_is_superspeed(struct usb_device *hdev)
	140	{
	141	return hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS;
	142	}
	143
0cdd49a1 MN	144	static inline int hub_is_superspeedplus(struct usb_device *hdev)
	145	{
	146	return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS &&
	147	le16_to_cpu(hdev->descriptor.bcdUSB) >= 0x0310 &&
	148	hdev->bos->ssp_cap);
	149	}
	150
7ad3c470 DW	151	static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
	152	{
	153	unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
	154
	155	/* Wait at least 100 msec for power to become stable */
	156	return max(delay, 100U);
	157	}
	158
ad493e5e LT	159	static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
	160	int port1)
	161	{
	162	return hub_port_debounce(hub, port1, true);
	163	}
	164
	165	static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
	166	int port1)
	167	{
	168	return hub_port_debounce(hub, port1, false);
	169	}