Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
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
14#include <linux/usb.h>
15#include <linux/usb/ch11.h>
16#include <linux/usb/hcd.h>
17#include <linux/usb/typec.h>
18#include "usb.h"
19
20struct usb_hub {
21 struct device *intfdev; /* the "interface" device */
22 struct usb_device *hdev;
23 struct kref kref;
24 struct urb *urb; /* for interrupt polling pipe */
25
26 /* buffer for urb ... with extra space in case of babble */
27 u8 (*buffer)[8];
28 union {
29 struct usb_hub_status hub;
30 struct usb_port_status port;
31 } *status; /* buffer for status reports */
32 struct mutex status_mutex; /* for the status buffer */
33
34 int error; /* last reported error */
35 int nerrors; /* track consecutive errors */
36
37 unsigned long event_bits[1]; /* status change bitmask */
38 unsigned long change_bits[1]; /* ports with logical connect
39 status change */
40 unsigned long removed_bits[1]; /* ports with a "removed"
41 device present */
42 unsigned long wakeup_bits[1]; /* ports that have signaled
43 remote wakeup */
44 unsigned long power_bits[1]; /* ports that are powered */
45 unsigned long child_usage_bits[1]; /* ports powered on for
46 children */
47 unsigned long warm_reset_bits[1]; /* ports requesting warm
48 reset recovery */
49#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
50#error event_bits[] is too short!
51#endif
52
53 struct usb_hub_descriptor *descriptor; /* class descriptor */
54 struct usb_tt tt; /* Transaction Translator */
55
56 unsigned mA_per_port; /* current for each child */
57#ifdef CONFIG_PM
58 unsigned wakeup_enabled_descendants;
59#endif
60
61 unsigned limited_power:1;
62 unsigned quiescing:1;
63 unsigned disconnected:1;
64 unsigned in_reset:1;
65 unsigned quirk_disable_autosuspend:1;
66
67 unsigned quirk_check_port_auto_suspend:1;
68
69 unsigned has_indicators:1;
70 u8 indicator[USB_MAXCHILDREN];
71 struct delayed_work leds;
72 struct delayed_work init_work;
73 struct delayed_work post_resume_work;
74 struct work_struct events;
75 spinlock_t irq_urb_lock;
76 struct timer_list irq_urb_retry;
77 struct usb_port **ports;
78 struct list_head onboard_devs;
79};
80
81/**
82 * struct usb port - kernel's representation of a usb port
83 * @child: usb device attached to the port
84 * @dev: generic device interface
85 * @port_owner: port's owner
86 * @peer: related usb2 and usb3 ports (share the same connector)
87 * @connector: USB Type-C connector
88 * @req: default pm qos request for hubs without port power control
89 * @connect_type: port's connect type
90 * @state: device state of the usb device attached to the port
91 * @state_kn: kernfs_node of the sysfs attribute that accesses @state
92 * @location: opaque representation of platform connector location
93 * @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
94 * @portnum: port index num based one
95 * @is_superspeed cache super-speed status
96 * @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
97 * @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
98 * @early_stop: whether port initialization will be stopped earlier.
99 * @ignore_event: whether events of the port are ignored.
100 */
101struct usb_port {
102 struct usb_device *child;
103 struct device dev;
104 struct usb_dev_state *port_owner;
105 struct usb_port *peer;
106 struct typec_connector *connector;
107 struct dev_pm_qos_request *req;
108 enum usb_port_connect_type connect_type;
109 enum usb_device_state state;
110 struct kernfs_node *state_kn;
111 usb_port_location_t location;
112 struct mutex status_lock;
113 u32 over_current_count;
114 u8 portnum;
115 u32 quirks;
116 unsigned int early_stop:1;
117 unsigned int ignore_event:1;
118 unsigned int is_superspeed:1;
119 unsigned int usb3_lpm_u1_permit:1;
120 unsigned int usb3_lpm_u2_permit:1;
121};
122
123#define to_usb_port(_dev) \
124 container_of(_dev, struct usb_port, dev)
125
126extern int usb_hub_create_port_device(struct usb_hub *hub,
127 int port1);
128extern void usb_hub_remove_port_device(struct usb_hub *hub,
129 int port1);
130extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
131 int port1, bool set);
132extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev);
133extern void hub_get(struct usb_hub *hub);
134extern void hub_put(struct usb_hub *hub);
135extern int hub_port_debounce(struct usb_hub *hub, int port1,
136 bool must_be_connected);
137extern int usb_clear_port_feature(struct usb_device *hdev,
138 int port1, int feature);
139extern int usb_hub_port_status(struct usb_hub *hub, int port1,
140 u16 *status, u16 *change);
141extern int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus);
142
143static inline bool hub_is_port_power_switchable(struct usb_hub *hub)
144{
145 __le16 hcs;
146
147 if (!hub)
148 return false;
149 hcs = hub->descriptor->wHubCharacteristics;
150 return (le16_to_cpu(hcs) & HUB_CHAR_LPSM) < HUB_CHAR_NO_LPSM;
151}
152
153static inline int hub_is_superspeed(struct usb_device *hdev)
154{
155 return hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS;
156}
157
158static inline int hub_is_superspeedplus(struct usb_device *hdev)
159{
160 return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS &&
161 le16_to_cpu(hdev->descriptor.bcdUSB) >= 0x0310 &&
162 hdev->bos && hdev->bos->ssp_cap);
163}
164
165static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
166{
167 unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
168
169 if (!hub->hdev->parent) /* root hub */
170 return delay;
171 else /* Wait at least 100 msec for power to become stable */
172 return max(delay, 100U);
173}
174
175static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
176 int port1)
177{
178 return hub_port_debounce(hub, port1, true);
179}
180
181static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
182 int port1)
183{
184 return hub_port_debounce(hub, port1, false);
185}