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
usb_otg_state_string(enum usb_otg_state state)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 [USB_SPEED_SUPER_PLUS] = "super-speed-plus",
54 };
55
usb_speed_string(enum usb_device_speed speed)56 const char *usb_speed_string(enum usb_device_speed speed)
57 {
58 if (speed < 0 || speed >= ARRAY_SIZE(speed_names))
59 speed = USB_SPEED_UNKNOWN;
60 return speed_names[speed];
61 }
62 EXPORT_SYMBOL_GPL(usb_speed_string);
63
usb_get_maximum_speed(struct device * dev)64 enum usb_device_speed usb_get_maximum_speed(struct device *dev)
65 {
66 const char *maximum_speed;
67 int err;
68 int i;
69
70 err = device_property_read_string(dev, "maximum-speed", &maximum_speed);
71 if (err < 0)
72 return USB_SPEED_UNKNOWN;
73
74 for (i = 0; i < ARRAY_SIZE(speed_names); i++)
75 if (strcmp(maximum_speed, speed_names[i]) == 0)
76 return i;
77
78 return USB_SPEED_UNKNOWN;
79 }
80 EXPORT_SYMBOL_GPL(usb_get_maximum_speed);
81
usb_state_string(enum usb_device_state state)82 const char *usb_state_string(enum usb_device_state state)
83 {
84 static const char *const names[] = {
85 [USB_STATE_NOTATTACHED] = "not attached",
86 [USB_STATE_ATTACHED] = "attached",
87 [USB_STATE_POWERED] = "powered",
88 [USB_STATE_RECONNECTING] = "reconnecting",
89 [USB_STATE_UNAUTHENTICATED] = "unauthenticated",
90 [USB_STATE_DEFAULT] = "default",
91 [USB_STATE_ADDRESS] = "addressed",
92 [USB_STATE_CONFIGURED] = "configured",
93 [USB_STATE_SUSPENDED] = "suspended",
94 };
95
96 if (state < 0 || state >= ARRAY_SIZE(names))
97 return "UNKNOWN";
98
99 return names[state];
100 }
101 EXPORT_SYMBOL_GPL(usb_state_string);
102
103 static const char *const usb_dr_modes[] = {
104 [USB_DR_MODE_UNKNOWN] = "",
105 [USB_DR_MODE_HOST] = "host",
106 [USB_DR_MODE_PERIPHERAL] = "peripheral",
107 [USB_DR_MODE_OTG] = "otg",
108 };
109
usb_get_dr_mode(struct device * dev)110 enum usb_dr_mode usb_get_dr_mode(struct device *dev)
111 {
112 const char *dr_mode;
113 int err, i;
114
115 err = device_property_read_string(dev, "dr_mode", &dr_mode);
116 if (err < 0)
117 return USB_DR_MODE_UNKNOWN;
118
119 for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
120 if (!strcmp(dr_mode, usb_dr_modes[i]))
121 return i;
122
123 return USB_DR_MODE_UNKNOWN;
124 }
125 EXPORT_SYMBOL_GPL(usb_get_dr_mode);
126
127 #ifdef CONFIG_OF
128 /**
129 * of_usb_host_tpl_support - to get if Targeted Peripheral List is supported
130 * for given targeted hosts (non-PC hosts)
131 * @np: Pointer to the given device_node
132 *
133 * The function gets if the targeted hosts support TPL or not
134 */
of_usb_host_tpl_support(struct device_node * np)135 bool of_usb_host_tpl_support(struct device_node *np)
136 {
137 if (of_find_property(np, "tpl-support", NULL))
138 return true;
139
140 return false;
141 }
142 EXPORT_SYMBOL_GPL(of_usb_host_tpl_support);
143
144 /**
145 * of_usb_update_otg_caps - to update usb otg capabilities according to
146 * the passed properties in DT.
147 * @np: Pointer to the given device_node
148 * @otg_caps: Pointer to the target usb_otg_caps to be set
149 *
150 * The function updates the otg capabilities
151 */
of_usb_update_otg_caps(struct device_node * np,struct usb_otg_caps * otg_caps)152 int of_usb_update_otg_caps(struct device_node *np,
153 struct usb_otg_caps *otg_caps)
154 {
155 u32 otg_rev;
156
157 if (!otg_caps)
158 return -EINVAL;
159
160 if (!of_property_read_u32(np, "otg-rev", &otg_rev)) {
161 switch (otg_rev) {
162 case 0x0100:
163 case 0x0120:
164 case 0x0130:
165 case 0x0200:
166 /* Choose the lesser one if it's already been set */
167 if (otg_caps->otg_rev)
168 otg_caps->otg_rev = min_t(u16, otg_rev,
169 otg_caps->otg_rev);
170 else
171 otg_caps->otg_rev = otg_rev;
172 break;
173 default:
174 pr_err("%s: unsupported otg-rev: 0x%x\n",
175 np->full_name, otg_rev);
176 return -EINVAL;
177 }
178 } else {
179 /*
180 * otg-rev is mandatory for otg properties, if not passed
181 * we set it to be 0 and assume it's a legacy otg device.
182 * Non-dt platform can set it afterwards.
183 */
184 otg_caps->otg_rev = 0;
185 }
186
187 if (of_find_property(np, "hnp-disable", NULL))
188 otg_caps->hnp_support = false;
189 if (of_find_property(np, "srp-disable", NULL))
190 otg_caps->srp_support = false;
191 if (of_find_property(np, "adp-disable", NULL) ||
192 (otg_caps->otg_rev < 0x0200))
193 otg_caps->adp_support = false;
194
195 return 0;
196 }
197 EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);
198
199 #endif
200
201 MODULE_LICENSE("GPL");
202