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 unsigned quirk_disable_autosuspend:1;
65
66 unsigned quirk_check_port_auto_suspend:1;
67
68 unsigned has_indicators:1;
69 u8 indicator[USB_MAXCHILDREN];
70 struct delayed_work leds;
71 struct delayed_work init_work;
72 struct work_struct events;
73 spinlock_t irq_urb_lock;
74 struct timer_list irq_urb_retry;
75 struct usb_port **ports;
76 };
77
78 /**
79 * struct usb port - kernel's representation of a usb port
80 * @child: usb device attached to the port
81 * @dev: generic device interface
82 * @port_owner: port's owner
83 * @peer: related usb2 and usb3 ports (share the same connector)
84 * @req: default pm qos request for hubs without port power control
85 * @connect_type: port's connect type
86 * @location: opaque representation of platform connector location
87 * @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
88 * @portnum: port index num based one
89 * @is_superspeed cache super-speed status
90 * @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
91 * @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
92 * @early_stop: whether port initialization will be stopped earlier.
93 * @ignore_event: whether events of the port are ignored.
94 */
95 struct usb_port {
96 struct usb_device *child;
97 struct device dev;
98 struct usb_dev_state *port_owner;
99 struct usb_port *peer;
100 struct dev_pm_qos_request *req;
101 enum usb_port_connect_type connect_type;
102 usb_port_location_t location;
103 struct mutex status_lock;
104 u32 over_current_count;
105 u8 portnum;
106 u32 quirks;
107 unsigned int early_stop:1;
108 unsigned int ignore_event:1;
109 unsigned int is_superspeed:1;
110 unsigned int usb3_lpm_u1_permit:1;
111 unsigned int usb3_lpm_u2_permit:1;
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);
121 extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
122 int port1, bool set);
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
hub_is_port_power_switchable(struct usb_hub * hub)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
hub_is_superspeed(struct usb_device * hdev)139 static inline int hub_is_superspeed(struct usb_device *hdev)
140 {
141 return hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS;
142 }
143
hub_is_superspeedplus(struct usb_device * hdev)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 && hdev->bos->ssp_cap);
149 }
150
hub_power_on_good_delay(struct usb_hub * hub)151 static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
152 {
153 unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
154
155 if (!hub->hdev->parent) /* root hub */
156 return delay;
157 else /* Wait at least 100 msec for power to become stable */
158 return max(delay, 100U);
159 }
160
hub_port_debounce_be_connected(struct usb_hub * hub,int port1)161 static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
162 int port1)
163 {
164 return hub_port_debounce(hub, port1, true);
165 }
166
hub_port_debounce_be_stable(struct usb_hub * hub,int port1)167 static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
168 int port1)
169 {
170 return hub_port_debounce(hub, port1, false);
171 }
172