Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / usb / core / hub.h
1 /*
2  * usb hub driver head file
3  *
4  * Copyright (C) 1999 Linus Torvalds
5  * Copyright (C) 1999 Johannes Erdfelt
6  * Copyright (C) 1999 Gregory P. Smith
7  * Copyright (C) 2001 Brad Hards (bhards@bigpond.net.au)
8  * Copyright (C) 2012 Intel Corp (tianyu.lan@intel.com)
9  *
10  *  move struct usb_hub to this file.
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License version 2 as
14  * published by the Free Software Foundation.
15  *
16  * This program is distributed in the hope that it will be useful, but
17  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
18  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
19  * for more details.
20  */
21
22 #include <linux/usb.h>
23 #include <linux/usb/ch11.h>
24 #include <linux/usb/hcd.h>
25 #include "usb.h"
26
27 struct usb_hub {
28         struct device           *intfdev;       /* the "interface" device */
29         struct usb_device       *hdev;
30         struct kref             kref;
31         struct urb              *urb;           /* for interrupt polling pipe */
32
33         /* buffer for urb ... with extra space in case of babble */
34         u8                      (*buffer)[8];
35         union {
36                 struct usb_hub_status   hub;
37                 struct usb_port_status  port;
38         }                       *status;        /* buffer for status reports */
39         struct mutex            status_mutex;   /* for the status buffer */
40
41         int                     error;          /* last reported error */
42         int                     nerrors;        /* track consecutive errors */
43
44         unsigned long           event_bits[1];  /* status change bitmask */
45         unsigned long           change_bits[1]; /* ports with logical connect
46                                                         status change */
47         unsigned long           removed_bits[1]; /* ports with a "removed"
48                                                         device present */
49         unsigned long           wakeup_bits[1]; /* ports that have signaled
50                                                         remote wakeup */
51         unsigned long           power_bits[1]; /* ports that are powered */
52         unsigned long           child_usage_bits[1]; /* ports powered on for
53                                                         children */
54         unsigned long           warm_reset_bits[1]; /* ports requesting warm
55                                                         reset recovery */
56 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
57 #error event_bits[] is too short!
58 #endif
59
60         struct usb_hub_descriptor *descriptor;  /* class descriptor */
61         struct usb_tt           tt;             /* Transaction Translator */
62
63         unsigned                mA_per_port;    /* current for each child */
64 #ifdef  CONFIG_PM
65         unsigned                wakeup_enabled_descendants;
66 #endif
67
68         unsigned                limited_power:1;
69         unsigned                quiescing:1;
70         unsigned                disconnected:1;
71         unsigned                in_reset:1;
72
73         unsigned                quirk_check_port_auto_suspend:1;
74
75         unsigned                has_indicators:1;
76         u8                      indicator[USB_MAXCHILDREN];
77         struct delayed_work     leds;
78         struct delayed_work     init_work;
79         struct work_struct      events;
80         struct usb_port         **ports;
81 };
82
83 /**
84  * struct usb port - kernel's representation of a usb port
85  * @child: usb device attached to the port
86  * @dev: generic device interface
87  * @port_owner: port's owner
88  * @peer: related usb2 and usb3 ports (share the same connector)
89  * @req: default pm qos request for hubs without port power control
90  * @connect_type: port's connect type
91  * @location: opaque representation of platform connector location
92  * @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
93  * @portnum: port index num based one
94  * @is_superspeed cache super-speed status
95  */
96 struct usb_port {
97         struct usb_device *child;
98         struct device dev;
99         struct usb_dev_state *port_owner;
100         struct usb_port *peer;
101         struct dev_pm_qos_request *req;
102         enum usb_port_connect_type connect_type;
103         usb_port_location_t location;
104         struct mutex status_lock;
105         u8 portnum;
106         unsigned int is_superspeed: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
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
134 static inline int hub_is_superspeed(struct usb_device *hdev)
135 {
136         return hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS;
137 }
138
139 static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
140 {
141         unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
142
143         /* Wait at least 100 msec for power to become stable */
144         return max(delay, 100U);
145 }
146
147 static inline int hub_port_debounce_be_connected(struct usb_hub *hub,
148                 int port1)
149 {
150         return hub_port_debounce(hub, port1, true);
151 }
152
153 static inline int hub_port_debounce_be_stable(struct usb_hub *hub,
154                 int port1)
155 {
156         return hub_port_debounce(hub, port1, false);
157 }
158