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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Provides code common for host and device side USB.
4 *
5 * If either host side (ie. CONFIG_USB=y) or device side USB stack
6 * (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is
7 * compiled-in as well. Otherwise, if either of the two stacks is
8 * compiled as module, this file is compiled as module as well.
9 */
10
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/usb/ch9.h>
15#include <linux/usb/of.h>
16#include <linux/usb/otg.h>
17#include <linux/of_platform.h>
18#include <linux/debugfs.h>
19#include "common.h"
20
21static const char *const ep_type_names[] = {
22 [USB_ENDPOINT_XFER_CONTROL] = "ctrl",
23 [USB_ENDPOINT_XFER_ISOC] = "isoc",
24 [USB_ENDPOINT_XFER_BULK] = "bulk",
25 [USB_ENDPOINT_XFER_INT] = "intr",
26};
27
28const char *usb_ep_type_string(int ep_type)
29{
30 if (ep_type < 0 || ep_type >= ARRAY_SIZE(ep_type_names))
31 return "unknown";
32
33 return ep_type_names[ep_type];
34}
35EXPORT_SYMBOL_GPL(usb_ep_type_string);
36
37const char *usb_otg_state_string(enum usb_otg_state state)
38{
39 static const char *const names[] = {
40 [OTG_STATE_A_IDLE] = "a_idle",
41 [OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise",
42 [OTG_STATE_A_WAIT_BCON] = "a_wait_bcon",
43 [OTG_STATE_A_HOST] = "a_host",
44 [OTG_STATE_A_SUSPEND] = "a_suspend",
45 [OTG_STATE_A_PERIPHERAL] = "a_peripheral",
46 [OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall",
47 [OTG_STATE_A_VBUS_ERR] = "a_vbus_err",
48 [OTG_STATE_B_IDLE] = "b_idle",
49 [OTG_STATE_B_SRP_INIT] = "b_srp_init",
50 [OTG_STATE_B_PERIPHERAL] = "b_peripheral",
51 [OTG_STATE_B_WAIT_ACON] = "b_wait_acon",
52 [OTG_STATE_B_HOST] = "b_host",
53 };
54
55 if (state < 0 || state >= ARRAY_SIZE(names))
56 return "UNDEFINED";
57
58 return names[state];
59}
60EXPORT_SYMBOL_GPL(usb_otg_state_string);
61
62static const char *const speed_names[] = {
63 [USB_SPEED_UNKNOWN] = "UNKNOWN",
64 [USB_SPEED_LOW] = "low-speed",
65 [USB_SPEED_FULL] = "full-speed",
66 [USB_SPEED_HIGH] = "high-speed",
67 [USB_SPEED_WIRELESS] = "wireless",
68 [USB_SPEED_SUPER] = "super-speed",
69 [USB_SPEED_SUPER_PLUS] = "super-speed-plus",
70};
71
72const char *usb_speed_string(enum usb_device_speed speed)
73{
74 if (speed < 0 || speed >= ARRAY_SIZE(speed_names))
75 speed = USB_SPEED_UNKNOWN;
76 return speed_names[speed];
77}
78EXPORT_SYMBOL_GPL(usb_speed_string);
79
80enum usb_device_speed usb_get_maximum_speed(struct device *dev)
81{
82 const char *maximum_speed;
83 int ret;
84
85 ret = device_property_read_string(dev, "maximum-speed", &maximum_speed);
86 if (ret < 0)
87 return USB_SPEED_UNKNOWN;
88
89 ret = match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed);
90
91 return (ret < 0) ? USB_SPEED_UNKNOWN : ret;
92}
93EXPORT_SYMBOL_GPL(usb_get_maximum_speed);
94
95const char *usb_state_string(enum usb_device_state state)
96{
97 static const char *const names[] = {
98 [USB_STATE_NOTATTACHED] = "not attached",
99 [USB_STATE_ATTACHED] = "attached",
100 [USB_STATE_POWERED] = "powered",
101 [USB_STATE_RECONNECTING] = "reconnecting",
102 [USB_STATE_UNAUTHENTICATED] = "unauthenticated",
103 [USB_STATE_DEFAULT] = "default",
104 [USB_STATE_ADDRESS] = "addressed",
105 [USB_STATE_CONFIGURED] = "configured",
106 [USB_STATE_SUSPENDED] = "suspended",
107 };
108
109 if (state < 0 || state >= ARRAY_SIZE(names))
110 return "UNKNOWN";
111
112 return names[state];
113}
114EXPORT_SYMBOL_GPL(usb_state_string);
115
116static const char *const usb_dr_modes[] = {
117 [USB_DR_MODE_UNKNOWN] = "",
118 [USB_DR_MODE_HOST] = "host",
119 [USB_DR_MODE_PERIPHERAL] = "peripheral",
120 [USB_DR_MODE_OTG] = "otg",
121};
122
123static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
124{
125 int ret;
126
127 ret = match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);
128 return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret;
129}
130
131enum usb_dr_mode usb_get_dr_mode(struct device *dev)
132{
133 const char *dr_mode;
134 int err;
135
136 err = device_property_read_string(dev, "dr_mode", &dr_mode);
137 if (err < 0)
138 return USB_DR_MODE_UNKNOWN;
139
140 return usb_get_dr_mode_from_string(dr_mode);
141}
142EXPORT_SYMBOL_GPL(usb_get_dr_mode);
143
144#ifdef CONFIG_OF
145/**
146 * of_usb_get_dr_mode_by_phy - Get dual role mode for the controller device
147 * which is associated with the given phy device_node
148 * @np: Pointer to the given phy device_node
149 * @arg0: phandle args[0] for phy's with #phy-cells >= 1, or -1 for
150 * phys which do not have phy-cells
151 *
152 * In dts a usb controller associates with phy devices. The function gets
153 * the string from property 'dr_mode' of the controller associated with the
154 * given phy device node, and returns the correspondig enum usb_dr_mode.
155 */
156enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *np, int arg0)
157{
158 struct device_node *controller = NULL;
159 struct of_phandle_args args;
160 const char *dr_mode;
161 int index;
162 int err;
163
164 do {
165 controller = of_find_node_with_property(controller, "phys");
166 if (!of_device_is_available(controller))
167 continue;
168 index = 0;
169 do {
170 if (arg0 == -1) {
171 args.np = of_parse_phandle(controller, "phys",
172 index);
173 args.args_count = 0;
174 } else {
175 err = of_parse_phandle_with_args(controller,
176 "phys", "#phy-cells",
177 index, &args);
178 if (err)
179 break;
180 }
181
182 of_node_put(args.np);
183 if (args.np == np && (args.args_count == 0 ||
184 args.args[0] == arg0))
185 goto finish;
186 index++;
187 } while (args.np);
188 } while (controller);
189
190finish:
191 err = of_property_read_string(controller, "dr_mode", &dr_mode);
192 of_node_put(controller);
193
194 if (err < 0)
195 return USB_DR_MODE_UNKNOWN;
196
197 return usb_get_dr_mode_from_string(dr_mode);
198}
199EXPORT_SYMBOL_GPL(of_usb_get_dr_mode_by_phy);
200
201/**
202 * of_usb_host_tpl_support - to get if Targeted Peripheral List is supported
203 * for given targeted hosts (non-PC hosts)
204 * @np: Pointer to the given device_node
205 *
206 * The function gets if the targeted hosts support TPL or not
207 */
208bool of_usb_host_tpl_support(struct device_node *np)
209{
210 return of_property_read_bool(np, "tpl-support");
211}
212EXPORT_SYMBOL_GPL(of_usb_host_tpl_support);
213
214/**
215 * of_usb_update_otg_caps - to update usb otg capabilities according to
216 * the passed properties in DT.
217 * @np: Pointer to the given device_node
218 * @otg_caps: Pointer to the target usb_otg_caps to be set
219 *
220 * The function updates the otg capabilities
221 */
222int of_usb_update_otg_caps(struct device_node *np,
223 struct usb_otg_caps *otg_caps)
224{
225 u32 otg_rev;
226
227 if (!otg_caps)
228 return -EINVAL;
229
230 if (!of_property_read_u32(np, "otg-rev", &otg_rev)) {
231 switch (otg_rev) {
232 case 0x0100:
233 case 0x0120:
234 case 0x0130:
235 case 0x0200:
236 /* Choose the lesser one if it's already been set */
237 if (otg_caps->otg_rev)
238 otg_caps->otg_rev = min_t(u16, otg_rev,
239 otg_caps->otg_rev);
240 else
241 otg_caps->otg_rev = otg_rev;
242 break;
243 default:
244 pr_err("%pOF: unsupported otg-rev: 0x%x\n",
245 np, otg_rev);
246 return -EINVAL;
247 }
248 } else {
249 /*
250 * otg-rev is mandatory for otg properties, if not passed
251 * we set it to be 0 and assume it's a legacy otg device.
252 * Non-dt platform can set it afterwards.
253 */
254 otg_caps->otg_rev = 0;
255 }
256
257 if (of_property_read_bool(np, "hnp-disable"))
258 otg_caps->hnp_support = false;
259 if (of_property_read_bool(np, "srp-disable"))
260 otg_caps->srp_support = false;
261 if (of_property_read_bool(np, "adp-disable") ||
262 (otg_caps->otg_rev < 0x0200))
263 otg_caps->adp_support = false;
264
265 return 0;
266}
267EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);
268
269/**
270 * usb_of_get_companion_dev - Find the companion device
271 * @dev: the device pointer to find a companion
272 *
273 * Find the companion device from platform bus.
274 *
275 * Takes a reference to the returned struct device which needs to be dropped
276 * after use.
277 *
278 * Return: On success, a pointer to the companion device, %NULL on failure.
279 */
280struct device *usb_of_get_companion_dev(struct device *dev)
281{
282 struct device_node *node;
283 struct platform_device *pdev = NULL;
284
285 node = of_parse_phandle(dev->of_node, "companion", 0);
286 if (node)
287 pdev = of_find_device_by_node(node);
288
289 of_node_put(node);
290
291 return pdev ? &pdev->dev : NULL;
292}
293EXPORT_SYMBOL_GPL(usb_of_get_companion_dev);
294#endif
295
296struct dentry *usb_debug_root;
297EXPORT_SYMBOL_GPL(usb_debug_root);
298
299static int __init usb_common_init(void)
300{
301 usb_debug_root = debugfs_create_dir("usb", NULL);
302 ledtrig_usb_init();
303 return 0;
304}
305
306static void __exit usb_common_exit(void)
307{
308 ledtrig_usb_exit();
309 debugfs_remove_recursive(usb_debug_root);
310}
311
312subsys_initcall(usb_common_init);
313module_exit(usb_common_exit);
314
315MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Provides code common for host and device side USB.
4 *
5 * If either host side (ie. CONFIG_USB=y) or device side USB stack
6 * (ie. CONFIG_USB_GADGET=y) is compiled in the kernel, this module is
7 * compiled-in as well. Otherwise, if either of the two stacks is
8 * compiled as module, this file is compiled as module as well.
9 */
10
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/usb/ch9.h>
15#include <linux/usb/of.h>
16#include <linux/usb/otg.h>
17#include <linux/of_platform.h>
18#include <linux/debugfs.h>
19#include "common.h"
20
21static const char *const ep_type_names[] = {
22 [USB_ENDPOINT_XFER_CONTROL] = "ctrl",
23 [USB_ENDPOINT_XFER_ISOC] = "isoc",
24 [USB_ENDPOINT_XFER_BULK] = "bulk",
25 [USB_ENDPOINT_XFER_INT] = "intr",
26};
27
28/**
29 * usb_ep_type_string() - Returns human readable-name of the endpoint type.
30 * @ep_type: The endpoint type to return human-readable name for. If it's not
31 * any of the types: USB_ENDPOINT_XFER_{CONTROL, ISOC, BULK, INT},
32 * usually got by usb_endpoint_type(), the string 'unknown' will be returned.
33 */
34const char *usb_ep_type_string(int ep_type)
35{
36 if (ep_type < 0 || ep_type >= ARRAY_SIZE(ep_type_names))
37 return "unknown";
38
39 return ep_type_names[ep_type];
40}
41EXPORT_SYMBOL_GPL(usb_ep_type_string);
42
43const char *usb_otg_state_string(enum usb_otg_state state)
44{
45 static const char *const names[] = {
46 [OTG_STATE_A_IDLE] = "a_idle",
47 [OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise",
48 [OTG_STATE_A_WAIT_BCON] = "a_wait_bcon",
49 [OTG_STATE_A_HOST] = "a_host",
50 [OTG_STATE_A_SUSPEND] = "a_suspend",
51 [OTG_STATE_A_PERIPHERAL] = "a_peripheral",
52 [OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall",
53 [OTG_STATE_A_VBUS_ERR] = "a_vbus_err",
54 [OTG_STATE_B_IDLE] = "b_idle",
55 [OTG_STATE_B_SRP_INIT] = "b_srp_init",
56 [OTG_STATE_B_PERIPHERAL] = "b_peripheral",
57 [OTG_STATE_B_WAIT_ACON] = "b_wait_acon",
58 [OTG_STATE_B_HOST] = "b_host",
59 };
60
61 if (state < 0 || state >= ARRAY_SIZE(names))
62 return "UNDEFINED";
63
64 return names[state];
65}
66EXPORT_SYMBOL_GPL(usb_otg_state_string);
67
68static const char *const speed_names[] = {
69 [USB_SPEED_UNKNOWN] = "UNKNOWN",
70 [USB_SPEED_LOW] = "low-speed",
71 [USB_SPEED_FULL] = "full-speed",
72 [USB_SPEED_HIGH] = "high-speed",
73 [USB_SPEED_WIRELESS] = "wireless",
74 [USB_SPEED_SUPER] = "super-speed",
75 [USB_SPEED_SUPER_PLUS] = "super-speed-plus",
76};
77
78static const char *const ssp_rate[] = {
79 [USB_SSP_GEN_UNKNOWN] = "UNKNOWN",
80 [USB_SSP_GEN_2x1] = "super-speed-plus-gen2x1",
81 [USB_SSP_GEN_1x2] = "super-speed-plus-gen1x2",
82 [USB_SSP_GEN_2x2] = "super-speed-plus-gen2x2",
83};
84
85/**
86 * usb_speed_string() - Returns human readable-name of the speed.
87 * @speed: The speed to return human-readable name for. If it's not
88 * any of the speeds defined in usb_device_speed enum, string for
89 * USB_SPEED_UNKNOWN will be returned.
90 */
91const char *usb_speed_string(enum usb_device_speed speed)
92{
93 if (speed < 0 || speed >= ARRAY_SIZE(speed_names))
94 speed = USB_SPEED_UNKNOWN;
95 return speed_names[speed];
96}
97EXPORT_SYMBOL_GPL(usb_speed_string);
98
99/**
100 * usb_get_maximum_speed - Get maximum requested speed for a given USB
101 * controller.
102 * @dev: Pointer to the given USB controller device
103 *
104 * The function gets the maximum speed string from property "maximum-speed",
105 * and returns the corresponding enum usb_device_speed.
106 */
107enum usb_device_speed usb_get_maximum_speed(struct device *dev)
108{
109 const char *maximum_speed;
110 int ret;
111
112 ret = device_property_read_string(dev, "maximum-speed", &maximum_speed);
113 if (ret < 0)
114 return USB_SPEED_UNKNOWN;
115
116 ret = match_string(ssp_rate, ARRAY_SIZE(ssp_rate), maximum_speed);
117 if (ret > 0)
118 return USB_SPEED_SUPER_PLUS;
119
120 ret = match_string(speed_names, ARRAY_SIZE(speed_names), maximum_speed);
121 return (ret < 0) ? USB_SPEED_UNKNOWN : ret;
122}
123EXPORT_SYMBOL_GPL(usb_get_maximum_speed);
124
125/**
126 * usb_get_maximum_ssp_rate - Get the signaling rate generation and lane count
127 * of a SuperSpeed Plus capable device.
128 * @dev: Pointer to the given USB controller device
129 *
130 * If the string from "maximum-speed" property is super-speed-plus-genXxY where
131 * 'X' is the generation number and 'Y' is the number of lanes, then this
132 * function returns the corresponding enum usb_ssp_rate.
133 */
134enum usb_ssp_rate usb_get_maximum_ssp_rate(struct device *dev)
135{
136 const char *maximum_speed;
137 int ret;
138
139 ret = device_property_read_string(dev, "maximum-speed", &maximum_speed);
140 if (ret < 0)
141 return USB_SSP_GEN_UNKNOWN;
142
143 ret = match_string(ssp_rate, ARRAY_SIZE(ssp_rate), maximum_speed);
144 return (ret < 0) ? USB_SSP_GEN_UNKNOWN : ret;
145}
146EXPORT_SYMBOL_GPL(usb_get_maximum_ssp_rate);
147
148/**
149 * usb_state_string - Returns human readable name for the state.
150 * @state: The state to return a human-readable name for. If it's not
151 * any of the states devices in usb_device_state_string enum,
152 * the string UNKNOWN will be returned.
153 */
154const char *usb_state_string(enum usb_device_state state)
155{
156 static const char *const names[] = {
157 [USB_STATE_NOTATTACHED] = "not attached",
158 [USB_STATE_ATTACHED] = "attached",
159 [USB_STATE_POWERED] = "powered",
160 [USB_STATE_RECONNECTING] = "reconnecting",
161 [USB_STATE_UNAUTHENTICATED] = "unauthenticated",
162 [USB_STATE_DEFAULT] = "default",
163 [USB_STATE_ADDRESS] = "addressed",
164 [USB_STATE_CONFIGURED] = "configured",
165 [USB_STATE_SUSPENDED] = "suspended",
166 };
167
168 if (state < 0 || state >= ARRAY_SIZE(names))
169 return "UNKNOWN";
170
171 return names[state];
172}
173EXPORT_SYMBOL_GPL(usb_state_string);
174
175static const char *const usb_dr_modes[] = {
176 [USB_DR_MODE_UNKNOWN] = "",
177 [USB_DR_MODE_HOST] = "host",
178 [USB_DR_MODE_PERIPHERAL] = "peripheral",
179 [USB_DR_MODE_OTG] = "otg",
180};
181
182static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
183{
184 int ret;
185
186 ret = match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);
187 return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret;
188}
189
190enum usb_dr_mode usb_get_dr_mode(struct device *dev)
191{
192 const char *dr_mode;
193 int err;
194
195 err = device_property_read_string(dev, "dr_mode", &dr_mode);
196 if (err < 0)
197 return USB_DR_MODE_UNKNOWN;
198
199 return usb_get_dr_mode_from_string(dr_mode);
200}
201EXPORT_SYMBOL_GPL(usb_get_dr_mode);
202
203/**
204 * usb_get_role_switch_default_mode - Get default mode for given device
205 * @dev: Pointer to the given device
206 *
207 * The function gets string from property 'role-switch-default-mode',
208 * and returns the corresponding enum usb_dr_mode.
209 */
210enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev)
211{
212 const char *str;
213 int ret;
214
215 ret = device_property_read_string(dev, "role-switch-default-mode", &str);
216 if (ret < 0)
217 return USB_DR_MODE_UNKNOWN;
218
219 return usb_get_dr_mode_from_string(str);
220}
221EXPORT_SYMBOL_GPL(usb_get_role_switch_default_mode);
222
223/**
224 * usb_decode_interval - Decode bInterval into the time expressed in 1us unit
225 * @epd: The descriptor of the endpoint
226 * @speed: The speed that the endpoint works as
227 *
228 * Function returns the interval expressed in 1us unit for servicing
229 * endpoint for data transfers.
230 */
231unsigned int usb_decode_interval(const struct usb_endpoint_descriptor *epd,
232 enum usb_device_speed speed)
233{
234 unsigned int interval = 0;
235
236 switch (usb_endpoint_type(epd)) {
237 case USB_ENDPOINT_XFER_CONTROL:
238 /* uframes per NAK */
239 if (speed == USB_SPEED_HIGH)
240 interval = epd->bInterval;
241 break;
242 case USB_ENDPOINT_XFER_ISOC:
243 interval = 1 << (epd->bInterval - 1);
244 break;
245 case USB_ENDPOINT_XFER_BULK:
246 /* uframes per NAK */
247 if (speed == USB_SPEED_HIGH && usb_endpoint_dir_out(epd))
248 interval = epd->bInterval;
249 break;
250 case USB_ENDPOINT_XFER_INT:
251 if (speed >= USB_SPEED_HIGH)
252 interval = 1 << (epd->bInterval - 1);
253 else
254 interval = epd->bInterval;
255 break;
256 }
257
258 interval *= (speed >= USB_SPEED_HIGH) ? 125 : 1000;
259
260 return interval;
261}
262EXPORT_SYMBOL_GPL(usb_decode_interval);
263
264#ifdef CONFIG_OF
265/**
266 * of_usb_get_dr_mode_by_phy - Get dual role mode for the controller device
267 * which is associated with the given phy device_node
268 * @np: Pointer to the given phy device_node
269 * @arg0: phandle args[0] for phy's with #phy-cells >= 1, or -1 for
270 * phys which do not have phy-cells
271 *
272 * In dts a usb controller associates with phy devices. The function gets
273 * the string from property 'dr_mode' of the controller associated with the
274 * given phy device node, and returns the correspondig enum usb_dr_mode.
275 */
276enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *np, int arg0)
277{
278 struct device_node *controller = NULL;
279 struct of_phandle_args args;
280 const char *dr_mode;
281 int index;
282 int err;
283
284 do {
285 controller = of_find_node_with_property(controller, "phys");
286 if (!of_device_is_available(controller))
287 continue;
288 index = 0;
289 do {
290 if (arg0 == -1) {
291 args.np = of_parse_phandle(controller, "phys",
292 index);
293 args.args_count = 0;
294 } else {
295 err = of_parse_phandle_with_args(controller,
296 "phys", "#phy-cells",
297 index, &args);
298 if (err)
299 break;
300 }
301
302 of_node_put(args.np);
303 if (args.np == np && (args.args_count == 0 ||
304 args.args[0] == arg0))
305 goto finish;
306 index++;
307 } while (args.np);
308 } while (controller);
309
310finish:
311 err = of_property_read_string(controller, "dr_mode", &dr_mode);
312 of_node_put(controller);
313
314 if (err < 0)
315 return USB_DR_MODE_UNKNOWN;
316
317 return usb_get_dr_mode_from_string(dr_mode);
318}
319EXPORT_SYMBOL_GPL(of_usb_get_dr_mode_by_phy);
320
321/**
322 * of_usb_host_tpl_support - to get if Targeted Peripheral List is supported
323 * for given targeted hosts (non-PC hosts)
324 * @np: Pointer to the given device_node
325 *
326 * The function gets if the targeted hosts support TPL or not
327 */
328bool of_usb_host_tpl_support(struct device_node *np)
329{
330 return of_property_read_bool(np, "tpl-support");
331}
332EXPORT_SYMBOL_GPL(of_usb_host_tpl_support);
333
334/**
335 * of_usb_update_otg_caps - to update usb otg capabilities according to
336 * the passed properties in DT.
337 * @np: Pointer to the given device_node
338 * @otg_caps: Pointer to the target usb_otg_caps to be set
339 *
340 * The function updates the otg capabilities
341 */
342int of_usb_update_otg_caps(struct device_node *np,
343 struct usb_otg_caps *otg_caps)
344{
345 u32 otg_rev;
346
347 if (!otg_caps)
348 return -EINVAL;
349
350 if (!of_property_read_u32(np, "otg-rev", &otg_rev)) {
351 switch (otg_rev) {
352 case 0x0100:
353 case 0x0120:
354 case 0x0130:
355 case 0x0200:
356 /* Choose the lesser one if it's already been set */
357 if (otg_caps->otg_rev)
358 otg_caps->otg_rev = min_t(u16, otg_rev,
359 otg_caps->otg_rev);
360 else
361 otg_caps->otg_rev = otg_rev;
362 break;
363 default:
364 pr_err("%pOF: unsupported otg-rev: 0x%x\n",
365 np, otg_rev);
366 return -EINVAL;
367 }
368 } else {
369 /*
370 * otg-rev is mandatory for otg properties, if not passed
371 * we set it to be 0 and assume it's a legacy otg device.
372 * Non-dt platform can set it afterwards.
373 */
374 otg_caps->otg_rev = 0;
375 }
376
377 if (of_property_read_bool(np, "hnp-disable"))
378 otg_caps->hnp_support = false;
379 if (of_property_read_bool(np, "srp-disable"))
380 otg_caps->srp_support = false;
381 if (of_property_read_bool(np, "adp-disable") ||
382 (otg_caps->otg_rev < 0x0200))
383 otg_caps->adp_support = false;
384
385 return 0;
386}
387EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);
388
389/**
390 * usb_of_get_companion_dev - Find the companion device
391 * @dev: the device pointer to find a companion
392 *
393 * Find the companion device from platform bus.
394 *
395 * Takes a reference to the returned struct device which needs to be dropped
396 * after use.
397 *
398 * Return: On success, a pointer to the companion device, %NULL on failure.
399 */
400struct device *usb_of_get_companion_dev(struct device *dev)
401{
402 struct device_node *node;
403 struct platform_device *pdev = NULL;
404
405 node = of_parse_phandle(dev->of_node, "companion", 0);
406 if (node)
407 pdev = of_find_device_by_node(node);
408
409 of_node_put(node);
410
411 return pdev ? &pdev->dev : NULL;
412}
413EXPORT_SYMBOL_GPL(usb_of_get_companion_dev);
414#endif
415
416struct dentry *usb_debug_root;
417EXPORT_SYMBOL_GPL(usb_debug_root);
418
419static int __init usb_common_init(void)
420{
421 usb_debug_root = debugfs_create_dir("usb", NULL);
422 ledtrig_usb_init();
423 return 0;
424}
425
426static void __exit usb_common_exit(void)
427{
428 ledtrig_usb_exit();
429 debugfs_remove_recursive(usb_debug_root);
430}
431
432subsys_initcall(usb_common_init);
433module_exit(usb_common_exit);
434
435MODULE_LICENSE("GPL");