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e538dfda MN |
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> | |
1c9af653 | 16 | #include <linux/of.h> |
e538dfda | 17 | #include <linux/usb/ch9.h> |
1c9af653 | 18 | #include <linux/usb/of.h> |
7009bdd7 | 19 | #include <linux/usb/otg.h> |
98bfb394 | 20 | #include <linux/of_platform.h> |
7009bdd7 FB |
21 | |
22 | const char *usb_otg_state_string(enum usb_otg_state state) | |
23 | { | |
24 | static const char *const names[] = { | |
25 | [OTG_STATE_A_IDLE] = "a_idle", | |
26 | [OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise", | |
27 | [OTG_STATE_A_WAIT_BCON] = "a_wait_bcon", | |
28 | [OTG_STATE_A_HOST] = "a_host", | |
29 | [OTG_STATE_A_SUSPEND] = "a_suspend", | |
30 | [OTG_STATE_A_PERIPHERAL] = "a_peripheral", | |
31 | [OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall", | |
32 | [OTG_STATE_A_VBUS_ERR] = "a_vbus_err", | |
33 | [OTG_STATE_B_IDLE] = "b_idle", | |
34 | [OTG_STATE_B_SRP_INIT] = "b_srp_init", | |
35 | [OTG_STATE_B_PERIPHERAL] = "b_peripheral", | |
36 | [OTG_STATE_B_WAIT_ACON] = "b_wait_acon", | |
37 | [OTG_STATE_B_HOST] = "b_host", | |
38 | }; | |
39 | ||
40 | if (state < 0 || state >= ARRAY_SIZE(names)) | |
41 | return "UNDEFINED"; | |
42 | ||
43 | return names[state]; | |
44 | } | |
45 | EXPORT_SYMBOL_GPL(usb_otg_state_string); | |
e538dfda | 46 | |
1494a1f6 FB |
47 | static const char *const speed_names[] = { |
48 | [USB_SPEED_UNKNOWN] = "UNKNOWN", | |
49 | [USB_SPEED_LOW] = "low-speed", | |
50 | [USB_SPEED_FULL] = "full-speed", | |
51 | [USB_SPEED_HIGH] = "high-speed", | |
52 | [USB_SPEED_WIRELESS] = "wireless", | |
53 | [USB_SPEED_SUPER] = "super-speed", | |
8a1b2725 | 54 | [USB_SPEED_SUPER_PLUS] = "super-speed-plus", |
1494a1f6 FB |
55 | }; |
56 | ||
e538dfda MN |
57 | const char *usb_speed_string(enum usb_device_speed speed) |
58 | { | |
1494a1f6 | 59 | if (speed < 0 || speed >= ARRAY_SIZE(speed_names)) |
e538dfda | 60 | speed = USB_SPEED_UNKNOWN; |
1494a1f6 | 61 | return speed_names[speed]; |
e538dfda MN |
62 | } |
63 | EXPORT_SYMBOL_GPL(usb_speed_string); | |
64 | ||
63863b98 HK |
65 | enum usb_device_speed usb_get_maximum_speed(struct device *dev) |
66 | { | |
67 | const char *maximum_speed; | |
efc2cd79 | 68 | int ret; |
63863b98 | 69 | |
efc2cd79 HK |
70 | ret = device_property_read_string(dev, "maximum-speed", &maximum_speed); |
71 | if (ret < 0) | |
63863b98 HK |
72 | return USB_SPEED_UNKNOWN; |
73 | ||
efc2cd79 | 74 | ret = match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed); |
63863b98 | 75 | |
efc2cd79 | 76 | return (ret < 0) ? USB_SPEED_UNKNOWN : ret; |
63863b98 HK |
77 | } |
78 | EXPORT_SYMBOL_GPL(usb_get_maximum_speed); | |
79 | ||
d1e3d757 FB |
80 | const char *usb_state_string(enum usb_device_state state) |
81 | { | |
82 | static const char *const names[] = { | |
83 | [USB_STATE_NOTATTACHED] = "not attached", | |
84 | [USB_STATE_ATTACHED] = "attached", | |
85 | [USB_STATE_POWERED] = "powered", | |
86 | [USB_STATE_RECONNECTING] = "reconnecting", | |
87 | [USB_STATE_UNAUTHENTICATED] = "unauthenticated", | |
88 | [USB_STATE_DEFAULT] = "default", | |
f9076e28 | 89 | [USB_STATE_ADDRESS] = "addressed", |
d1e3d757 FB |
90 | [USB_STATE_CONFIGURED] = "configured", |
91 | [USB_STATE_SUSPENDED] = "suspended", | |
92 | }; | |
93 | ||
94 | if (state < 0 || state >= ARRAY_SIZE(names)) | |
95 | return "UNKNOWN"; | |
96 | ||
97 | return names[state]; | |
98 | } | |
99 | EXPORT_SYMBOL_GPL(usb_state_string); | |
100 | ||
1c9af653 MG |
101 | static const char *const usb_dr_modes[] = { |
102 | [USB_DR_MODE_UNKNOWN] = "", | |
103 | [USB_DR_MODE_HOST] = "host", | |
104 | [USB_DR_MODE_PERIPHERAL] = "peripheral", | |
105 | [USB_DR_MODE_OTG] = "otg", | |
106 | }; | |
107 | ||
98bfb394 BL |
108 | static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str) |
109 | { | |
efc2cd79 | 110 | int ret; |
98bfb394 | 111 | |
efc2cd79 HK |
112 | ret = match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str); |
113 | return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret; | |
98bfb394 BL |
114 | } |
115 | ||
06e7114f | 116 | enum usb_dr_mode usb_get_dr_mode(struct device *dev) |
1c9af653 MG |
117 | { |
118 | const char *dr_mode; | |
98bfb394 | 119 | int err; |
1c9af653 | 120 | |
06e7114f | 121 | err = device_property_read_string(dev, "dr_mode", &dr_mode); |
1c9af653 MG |
122 | if (err < 0) |
123 | return USB_DR_MODE_UNKNOWN; | |
124 | ||
98bfb394 | 125 | return usb_get_dr_mode_from_string(dr_mode); |
1c9af653 | 126 | } |
06e7114f | 127 | EXPORT_SYMBOL_GPL(usb_get_dr_mode); |
1494a1f6 | 128 | |
06e7114f | 129 | #ifdef CONFIG_OF |
98bfb394 BL |
130 | /** |
131 | * of_usb_get_dr_mode_by_phy - Get dual role mode for the controller device | |
132 | * which is associated with the given phy device_node | |
133 | * @np: Pointer to the given phy device_node | |
ce15ed4c HG |
134 | * @arg0: phandle args[0] for phy's with #phy-cells >= 1, or -1 for |
135 | * phys which do not have phy-cells | |
98bfb394 BL |
136 | * |
137 | * In dts a usb controller associates with phy devices. The function gets | |
138 | * the string from property 'dr_mode' of the controller associated with the | |
139 | * given phy device node, and returns the correspondig enum usb_dr_mode. | |
140 | */ | |
ce15ed4c | 141 | enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *np, int arg0) |
98bfb394 BL |
142 | { |
143 | struct device_node *controller = NULL; | |
ce15ed4c | 144 | struct of_phandle_args args; |
98bfb394 BL |
145 | const char *dr_mode; |
146 | int index; | |
147 | int err; | |
148 | ||
149 | do { | |
150 | controller = of_find_node_with_property(controller, "phys"); | |
151 | index = 0; | |
152 | do { | |
ce15ed4c HG |
153 | if (arg0 == -1) { |
154 | args.np = of_parse_phandle(controller, "phys", | |
155 | index); | |
156 | args.args_count = 0; | |
157 | } else { | |
158 | err = of_parse_phandle_with_args(controller, | |
159 | "phys", "#phy-cells", | |
160 | index, &args); | |
161 | if (err) | |
162 | break; | |
163 | } | |
164 | ||
165 | of_node_put(args.np); | |
166 | if (args.np == np && (args.args_count == 0 || | |
167 | args.args[0] == arg0)) | |
98bfb394 BL |
168 | goto finish; |
169 | index++; | |
ce15ed4c | 170 | } while (args.np); |
98bfb394 BL |
171 | } while (controller); |
172 | ||
173 | finish: | |
174 | err = of_property_read_string(controller, "dr_mode", &dr_mode); | |
175 | of_node_put(controller); | |
176 | ||
177 | if (err < 0) | |
178 | return USB_DR_MODE_UNKNOWN; | |
179 | ||
180 | return usb_get_dr_mode_from_string(dr_mode); | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(of_usb_get_dr_mode_by_phy); | |
183 | ||
05f8b35a PC |
184 | /** |
185 | * of_usb_host_tpl_support - to get if Targeted Peripheral List is supported | |
186 | * for given targeted hosts (non-PC hosts) | |
187 | * @np: Pointer to the given device_node | |
188 | * | |
189 | * The function gets if the targeted hosts support TPL or not | |
190 | */ | |
191 | bool of_usb_host_tpl_support(struct device_node *np) | |
192 | { | |
193 | if (of_find_property(np, "tpl-support", NULL)) | |
194 | return true; | |
195 | ||
196 | return false; | |
197 | } | |
198 | EXPORT_SYMBOL_GPL(of_usb_host_tpl_support); | |
929412d9 LJ |
199 | |
200 | /** | |
201 | * of_usb_update_otg_caps - to update usb otg capabilities according to | |
202 | * the passed properties in DT. | |
203 | * @np: Pointer to the given device_node | |
204 | * @otg_caps: Pointer to the target usb_otg_caps to be set | |
205 | * | |
206 | * The function updates the otg capabilities | |
207 | */ | |
208 | int of_usb_update_otg_caps(struct device_node *np, | |
209 | struct usb_otg_caps *otg_caps) | |
210 | { | |
211 | u32 otg_rev; | |
212 | ||
213 | if (!otg_caps) | |
214 | return -EINVAL; | |
215 | ||
216 | if (!of_property_read_u32(np, "otg-rev", &otg_rev)) { | |
217 | switch (otg_rev) { | |
218 | case 0x0100: | |
219 | case 0x0120: | |
220 | case 0x0130: | |
221 | case 0x0200: | |
222 | /* Choose the lesser one if it's already been set */ | |
223 | if (otg_caps->otg_rev) | |
224 | otg_caps->otg_rev = min_t(u16, otg_rev, | |
225 | otg_caps->otg_rev); | |
226 | else | |
227 | otg_caps->otg_rev = otg_rev; | |
228 | break; | |
229 | default: | |
230 | pr_err("%s: unsupported otg-rev: 0x%x\n", | |
231 | np->full_name, otg_rev); | |
232 | return -EINVAL; | |
233 | } | |
234 | } else { | |
235 | /* | |
236 | * otg-rev is mandatory for otg properties, if not passed | |
237 | * we set it to be 0 and assume it's a legacy otg device. | |
238 | * Non-dt platform can set it afterwards. | |
239 | */ | |
240 | otg_caps->otg_rev = 0; | |
241 | } | |
242 | ||
243 | if (of_find_property(np, "hnp-disable", NULL)) | |
244 | otg_caps->hnp_support = false; | |
245 | if (of_find_property(np, "srp-disable", NULL)) | |
246 | otg_caps->srp_support = false; | |
247 | if (of_find_property(np, "adp-disable", NULL) || | |
248 | (otg_caps->otg_rev < 0x0200)) | |
249 | otg_caps->adp_support = false; | |
250 | ||
251 | return 0; | |
252 | } | |
253 | EXPORT_SYMBOL_GPL(of_usb_update_otg_caps); | |
254 | ||
1c9af653 MG |
255 | #endif |
256 | ||
e538dfda | 257 | MODULE_LICENSE("GPL"); |