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