Merge tag 'pci-v3.14-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
[linux-2.6-microblaze.git] / drivers / usb / usb-common.c
1 /*
2  * Provides code common for host and device side USB.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License as
6  * published by the Free Software Foundation, version 2.
7  *
8  * If either host side (ie. CONFIG_USB=y) or device side USB stack
9  * (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is
10  * compiled-in as well.  Otherwise, if either of the two stacks is
11  * compiled as module, this file is compiled as module as well.
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/usb/ch9.h>
18 #include <linux/usb/of.h>
19 #include <linux/usb/otg.h>
20
21 const char *usb_otg_state_string(enum usb_otg_state state)
22 {
23         static const char *const names[] = {
24                 [OTG_STATE_A_IDLE] = "a_idle",
25                 [OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise",
26                 [OTG_STATE_A_WAIT_BCON] = "a_wait_bcon",
27                 [OTG_STATE_A_HOST] = "a_host",
28                 [OTG_STATE_A_SUSPEND] = "a_suspend",
29                 [OTG_STATE_A_PERIPHERAL] = "a_peripheral",
30                 [OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall",
31                 [OTG_STATE_A_VBUS_ERR] = "a_vbus_err",
32                 [OTG_STATE_B_IDLE] = "b_idle",
33                 [OTG_STATE_B_SRP_INIT] = "b_srp_init",
34                 [OTG_STATE_B_PERIPHERAL] = "b_peripheral",
35                 [OTG_STATE_B_WAIT_ACON] = "b_wait_acon",
36                 [OTG_STATE_B_HOST] = "b_host",
37         };
38
39         if (state < 0 || state >= ARRAY_SIZE(names))
40                 return "UNDEFINED";
41
42         return names[state];
43 }
44 EXPORT_SYMBOL_GPL(usb_otg_state_string);
45
46 static const char *const speed_names[] = {
47         [USB_SPEED_UNKNOWN] = "UNKNOWN",
48         [USB_SPEED_LOW] = "low-speed",
49         [USB_SPEED_FULL] = "full-speed",
50         [USB_SPEED_HIGH] = "high-speed",
51         [USB_SPEED_WIRELESS] = "wireless",
52         [USB_SPEED_SUPER] = "super-speed",
53 };
54
55 const char *usb_speed_string(enum usb_device_speed speed)
56 {
57         if (speed < 0 || speed >= ARRAY_SIZE(speed_names))
58                 speed = USB_SPEED_UNKNOWN;
59         return speed_names[speed];
60 }
61 EXPORT_SYMBOL_GPL(usb_speed_string);
62
63 const char *usb_state_string(enum usb_device_state state)
64 {
65         static const char *const names[] = {
66                 [USB_STATE_NOTATTACHED] = "not attached",
67                 [USB_STATE_ATTACHED] = "attached",
68                 [USB_STATE_POWERED] = "powered",
69                 [USB_STATE_RECONNECTING] = "reconnecting",
70                 [USB_STATE_UNAUTHENTICATED] = "unauthenticated",
71                 [USB_STATE_DEFAULT] = "default",
72                 [USB_STATE_ADDRESS] = "addresssed",
73                 [USB_STATE_CONFIGURED] = "configured",
74                 [USB_STATE_SUSPENDED] = "suspended",
75         };
76
77         if (state < 0 || state >= ARRAY_SIZE(names))
78                 return "UNKNOWN";
79
80         return names[state];
81 }
82 EXPORT_SYMBOL_GPL(usb_state_string);
83
84 #ifdef CONFIG_OF
85 static const char *const usb_dr_modes[] = {
86         [USB_DR_MODE_UNKNOWN]           = "",
87         [USB_DR_MODE_HOST]              = "host",
88         [USB_DR_MODE_PERIPHERAL]        = "peripheral",
89         [USB_DR_MODE_OTG]               = "otg",
90 };
91
92 /**
93  * of_usb_get_dr_mode - Get dual role mode for given device_node
94  * @np: Pointer to the given device_node
95  *
96  * The function gets phy interface string from property 'dr_mode',
97  * and returns the correspondig enum usb_dr_mode
98  */
99 enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
100 {
101         const char *dr_mode;
102         int err, i;
103
104         err = of_property_read_string(np, "dr_mode", &dr_mode);
105         if (err < 0)
106                 return USB_DR_MODE_UNKNOWN;
107
108         for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
109                 if (!strcmp(dr_mode, usb_dr_modes[i]))
110                         return i;
111
112         return USB_DR_MODE_UNKNOWN;
113 }
114 EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);
115
116 /**
117  * of_usb_get_maximum_speed - Get maximum requested speed for a given USB
118  * controller.
119  * @np: Pointer to the given device_node
120  *
121  * The function gets the maximum speed string from property "maximum-speed",
122  * and returns the corresponding enum usb_device_speed.
123  */
124 enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np)
125 {
126         const char *maximum_speed;
127         int err;
128         int i;
129
130         err = of_property_read_string(np, "maximum-speed", &maximum_speed);
131         if (err < 0)
132                 return USB_SPEED_UNKNOWN;
133
134         for (i = 0; i < ARRAY_SIZE(speed_names); i++)
135                 if (strcmp(maximum_speed, speed_names[i]) == 0)
136                         return i;
137
138         return USB_SPEED_UNKNOWN;
139 }
140 EXPORT_SYMBOL_GPL(of_usb_get_maximum_speed);
141
142 #endif
143
144 MODULE_LICENSE("GPL");