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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * USB Role Switch Support
4 *
5 * Copyright (C) 2018 Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
7 * Hans de Goede <hdegoede@redhat.com>
8 */
9
10#include <linux/usb/role.h>
11#include <linux/property.h>
12#include <linux/device.h>
13#include <linux/module.h>
14#include <linux/mutex.h>
15#include <linux/slab.h>
16
17static struct class *role_class;
18
19struct usb_role_switch {
20 struct device dev;
21 struct mutex lock; /* device lock*/
22 enum usb_role role;
23
24 /* From descriptor */
25 struct device *usb2_port;
26 struct device *usb3_port;
27 struct device *udc;
28 usb_role_switch_set_t set;
29 usb_role_switch_get_t get;
30 bool allow_userspace_control;
31};
32
33#define to_role_switch(d) container_of(d, struct usb_role_switch, dev)
34
35/**
36 * usb_role_switch_set_role - Set USB role for a switch
37 * @sw: USB role switch
38 * @role: USB role to be switched to
39 *
40 * Set USB role @role for @sw.
41 */
42int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role)
43{
44 int ret;
45
46 if (IS_ERR_OR_NULL(sw))
47 return 0;
48
49 mutex_lock(&sw->lock);
50
51 ret = sw->set(sw, role);
52 if (!ret) {
53 sw->role = role;
54 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
55 }
56
57 mutex_unlock(&sw->lock);
58
59 return ret;
60}
61EXPORT_SYMBOL_GPL(usb_role_switch_set_role);
62
63/**
64 * usb_role_switch_get_role - Get the USB role for a switch
65 * @sw: USB role switch
66 *
67 * Depending on the role-switch-driver this function returns either a cached
68 * value of the last set role, or reads back the actual value from the hardware.
69 */
70enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
71{
72 enum usb_role role;
73
74 if (IS_ERR_OR_NULL(sw))
75 return USB_ROLE_NONE;
76
77 mutex_lock(&sw->lock);
78
79 if (sw->get)
80 role = sw->get(sw);
81 else
82 role = sw->role;
83
84 mutex_unlock(&sw->lock);
85
86 return role;
87}
88EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
89
90static void *usb_role_switch_match(struct device_connection *con, int ep,
91 void *data)
92{
93 struct device *dev;
94
95 if (con->fwnode) {
96 if (con->id && !fwnode_property_present(con->fwnode, con->id))
97 return NULL;
98
99 dev = class_find_device_by_fwnode(role_class, con->fwnode);
100 } else {
101 dev = class_find_device_by_name(role_class, con->endpoint[ep]);
102 }
103
104 return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
105}
106
107static struct usb_role_switch *
108usb_role_switch_is_parent(struct fwnode_handle *fwnode)
109{
110 struct fwnode_handle *parent = fwnode_get_parent(fwnode);
111 struct device *dev;
112
113 if (!parent || !fwnode_property_present(parent, "usb-role-switch"))
114 return NULL;
115
116 dev = class_find_device_by_fwnode(role_class, parent);
117 return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
118}
119
120/**
121 * usb_role_switch_get - Find USB role switch linked with the caller
122 * @dev: The caller device
123 *
124 * Finds and returns role switch linked with @dev. The reference count for the
125 * found switch is incremented.
126 */
127struct usb_role_switch *usb_role_switch_get(struct device *dev)
128{
129 struct usb_role_switch *sw;
130
131 sw = usb_role_switch_is_parent(dev_fwnode(dev));
132 if (!sw)
133 sw = device_connection_find_match(dev, "usb-role-switch", NULL,
134 usb_role_switch_match);
135
136 if (!IS_ERR_OR_NULL(sw))
137 WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
138
139 return sw;
140}
141EXPORT_SYMBOL_GPL(usb_role_switch_get);
142
143/**
144 * fwnode_usb_role_switch_get - Find USB role switch linked with the caller
145 * @fwnode: The caller device node
146 *
147 * This is similar to the usb_role_switch_get() function above, but it searches
148 * the switch using fwnode instead of device entry.
149 */
150struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
151{
152 struct usb_role_switch *sw;
153
154 sw = usb_role_switch_is_parent(fwnode);
155 if (!sw)
156 sw = fwnode_connection_find_match(fwnode, "usb-role-switch",
157 NULL, usb_role_switch_match);
158 if (!IS_ERR_OR_NULL(sw))
159 WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
160
161 return sw;
162}
163EXPORT_SYMBOL_GPL(fwnode_usb_role_switch_get);
164
165/**
166 * usb_role_switch_put - Release handle to a switch
167 * @sw: USB Role Switch
168 *
169 * Decrement reference count for @sw.
170 */
171void usb_role_switch_put(struct usb_role_switch *sw)
172{
173 if (!IS_ERR_OR_NULL(sw)) {
174 module_put(sw->dev.parent->driver->owner);
175 put_device(&sw->dev);
176 }
177}
178EXPORT_SYMBOL_GPL(usb_role_switch_put);
179
180/**
181 * usb_role_switch_find_by_fwnode - Find USB role switch with its fwnode
182 * @fwnode: fwnode of the USB Role Switch
183 *
184 * Finds and returns role switch with @fwnode. The reference count for the
185 * found switch is incremented.
186 */
187struct usb_role_switch *
188usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode)
189{
190 struct device *dev;
191
192 if (!fwnode)
193 return NULL;
194
195 dev = class_find_device_by_fwnode(role_class, fwnode);
196
197 return dev ? to_role_switch(dev) : NULL;
198}
199EXPORT_SYMBOL_GPL(usb_role_switch_find_by_fwnode);
200
201static umode_t
202usb_role_switch_is_visible(struct kobject *kobj, struct attribute *attr, int n)
203{
204 struct device *dev = kobj_to_dev(kobj);
205 struct usb_role_switch *sw = to_role_switch(dev);
206
207 if (sw->allow_userspace_control)
208 return attr->mode;
209
210 return 0;
211}
212
213static const char * const usb_roles[] = {
214 [USB_ROLE_NONE] = "none",
215 [USB_ROLE_HOST] = "host",
216 [USB_ROLE_DEVICE] = "device",
217};
218
219static ssize_t
220role_show(struct device *dev, struct device_attribute *attr, char *buf)
221{
222 struct usb_role_switch *sw = to_role_switch(dev);
223 enum usb_role role = usb_role_switch_get_role(sw);
224
225 return sprintf(buf, "%s\n", usb_roles[role]);
226}
227
228static ssize_t role_store(struct device *dev, struct device_attribute *attr,
229 const char *buf, size_t size)
230{
231 struct usb_role_switch *sw = to_role_switch(dev);
232 int ret;
233
234 ret = sysfs_match_string(usb_roles, buf);
235 if (ret < 0) {
236 bool res;
237
238 /* Extra check if the user wants to disable the switch */
239 ret = kstrtobool(buf, &res);
240 if (ret || res)
241 return -EINVAL;
242 }
243
244 ret = usb_role_switch_set_role(sw, ret);
245 if (ret)
246 return ret;
247
248 return size;
249}
250static DEVICE_ATTR_RW(role);
251
252static struct attribute *usb_role_switch_attrs[] = {
253 &dev_attr_role.attr,
254 NULL,
255};
256
257static const struct attribute_group usb_role_switch_group = {
258 .is_visible = usb_role_switch_is_visible,
259 .attrs = usb_role_switch_attrs,
260};
261
262static const struct attribute_group *usb_role_switch_groups[] = {
263 &usb_role_switch_group,
264 NULL,
265};
266
267static int
268usb_role_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
269{
270 int ret;
271
272 ret = add_uevent_var(env, "USB_ROLE_SWITCH=%s", dev_name(dev));
273 if (ret)
274 dev_err(dev, "failed to add uevent USB_ROLE_SWITCH\n");
275
276 return ret;
277}
278
279static void usb_role_switch_release(struct device *dev)
280{
281 struct usb_role_switch *sw = to_role_switch(dev);
282
283 kfree(sw);
284}
285
286static const struct device_type usb_role_dev_type = {
287 .name = "usb_role_switch",
288 .groups = usb_role_switch_groups,
289 .uevent = usb_role_switch_uevent,
290 .release = usb_role_switch_release,
291};
292
293/**
294 * usb_role_switch_register - Register USB Role Switch
295 * @parent: Parent device for the switch
296 * @desc: Description of the switch
297 *
298 * USB Role Switch is a device capable or choosing the role for USB connector.
299 * On platforms where the USB controller is dual-role capable, the controller
300 * driver will need to register the switch. On platforms where the USB host and
301 * USB device controllers behind the connector are separate, there will be a
302 * mux, and the driver for that mux will need to register the switch.
303 *
304 * Returns handle to a new role switch or ERR_PTR. The content of @desc is
305 * copied.
306 */
307struct usb_role_switch *
308usb_role_switch_register(struct device *parent,
309 const struct usb_role_switch_desc *desc)
310{
311 struct usb_role_switch *sw;
312 int ret;
313
314 if (!desc || !desc->set)
315 return ERR_PTR(-EINVAL);
316
317 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
318 if (!sw)
319 return ERR_PTR(-ENOMEM);
320
321 mutex_init(&sw->lock);
322
323 sw->allow_userspace_control = desc->allow_userspace_control;
324 sw->usb2_port = desc->usb2_port;
325 sw->usb3_port = desc->usb3_port;
326 sw->udc = desc->udc;
327 sw->set = desc->set;
328 sw->get = desc->get;
329
330 sw->dev.parent = parent;
331 sw->dev.fwnode = desc->fwnode;
332 sw->dev.class = role_class;
333 sw->dev.type = &usb_role_dev_type;
334 dev_set_drvdata(&sw->dev, desc->driver_data);
335 dev_set_name(&sw->dev, "%s-role-switch",
336 desc->name ? desc->name : dev_name(parent));
337
338 ret = device_register(&sw->dev);
339 if (ret) {
340 put_device(&sw->dev);
341 return ERR_PTR(ret);
342 }
343
344 /* TODO: Symlinks for the host port and the device controller. */
345
346 return sw;
347}
348EXPORT_SYMBOL_GPL(usb_role_switch_register);
349
350/**
351 * usb_role_switch_unregister - Unregsiter USB Role Switch
352 * @sw: USB Role Switch
353 *
354 * Unregister switch that was registered with usb_role_switch_register().
355 */
356void usb_role_switch_unregister(struct usb_role_switch *sw)
357{
358 if (!IS_ERR_OR_NULL(sw))
359 device_unregister(&sw->dev);
360}
361EXPORT_SYMBOL_GPL(usb_role_switch_unregister);
362
363/**
364 * usb_role_switch_set_drvdata - Assign private data pointer to a switch
365 * @sw: USB Role Switch
366 * @data: Private data pointer
367 */
368void usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data)
369{
370 dev_set_drvdata(&sw->dev, data);
371}
372EXPORT_SYMBOL_GPL(usb_role_switch_set_drvdata);
373
374/**
375 * usb_role_switch_get_drvdata - Get the private data pointer of a switch
376 * @sw: USB Role Switch
377 */
378void *usb_role_switch_get_drvdata(struct usb_role_switch *sw)
379{
380 return dev_get_drvdata(&sw->dev);
381}
382EXPORT_SYMBOL_GPL(usb_role_switch_get_drvdata);
383
384static int __init usb_roles_init(void)
385{
386 role_class = class_create(THIS_MODULE, "usb_role");
387 return PTR_ERR_OR_ZERO(role_class);
388}
389subsys_initcall(usb_roles_init);
390
391static void __exit usb_roles_exit(void)
392{
393 class_destroy(role_class);
394}
395module_exit(usb_roles_exit);
396
397MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
398MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
399MODULE_LICENSE("GPL v2");
400MODULE_DESCRIPTION("USB Role Class");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * USB Role Switch Support
4 *
5 * Copyright (C) 2018 Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
7 * Hans de Goede <hdegoede@redhat.com>
8 */
9
10#include <linux/usb/role.h>
11#include <linux/property.h>
12#include <linux/device.h>
13#include <linux/module.h>
14#include <linux/mutex.h>
15#include <linux/slab.h>
16
17static struct class *role_class;
18
19struct usb_role_switch {
20 struct device dev;
21 struct mutex lock; /* device lock*/
22 enum usb_role role;
23
24 /* From descriptor */
25 struct device *usb2_port;
26 struct device *usb3_port;
27 struct device *udc;
28 usb_role_switch_set_t set;
29 usb_role_switch_get_t get;
30 bool allow_userspace_control;
31};
32
33#define to_role_switch(d) container_of(d, struct usb_role_switch, dev)
34
35/**
36 * usb_role_switch_set_role - Set USB role for a switch
37 * @sw: USB role switch
38 * @role: USB role to be switched to
39 *
40 * Set USB role @role for @sw.
41 */
42int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role)
43{
44 int ret;
45
46 if (IS_ERR_OR_NULL(sw))
47 return 0;
48
49 mutex_lock(&sw->lock);
50
51 ret = sw->set(sw, role);
52 if (!ret) {
53 sw->role = role;
54 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
55 }
56
57 mutex_unlock(&sw->lock);
58
59 return ret;
60}
61EXPORT_SYMBOL_GPL(usb_role_switch_set_role);
62
63/**
64 * usb_role_switch_get_role - Get the USB role for a switch
65 * @sw: USB role switch
66 *
67 * Depending on the role-switch-driver this function returns either a cached
68 * value of the last set role, or reads back the actual value from the hardware.
69 */
70enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
71{
72 enum usb_role role;
73
74 if (IS_ERR_OR_NULL(sw))
75 return USB_ROLE_NONE;
76
77 mutex_lock(&sw->lock);
78
79 if (sw->get)
80 role = sw->get(sw);
81 else
82 role = sw->role;
83
84 mutex_unlock(&sw->lock);
85
86 return role;
87}
88EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
89
90static void *usb_role_switch_match(const struct fwnode_handle *fwnode, const char *id,
91 void *data)
92{
93 struct device *dev;
94
95 if (id && !fwnode_property_present(fwnode, id))
96 return NULL;
97
98 dev = class_find_device_by_fwnode(role_class, fwnode);
99
100 return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
101}
102
103static struct usb_role_switch *
104usb_role_switch_is_parent(struct fwnode_handle *fwnode)
105{
106 struct fwnode_handle *parent = fwnode_get_parent(fwnode);
107 struct device *dev;
108
109 if (!fwnode_property_present(parent, "usb-role-switch")) {
110 fwnode_handle_put(parent);
111 return NULL;
112 }
113
114 dev = class_find_device_by_fwnode(role_class, parent);
115 fwnode_handle_put(parent);
116 return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
117}
118
119/**
120 * usb_role_switch_get - Find USB role switch linked with the caller
121 * @dev: The caller device
122 *
123 * Finds and returns role switch linked with @dev. The reference count for the
124 * found switch is incremented.
125 */
126struct usb_role_switch *usb_role_switch_get(struct device *dev)
127{
128 struct usb_role_switch *sw;
129
130 sw = usb_role_switch_is_parent(dev_fwnode(dev));
131 if (!sw)
132 sw = device_connection_find_match(dev, "usb-role-switch", NULL,
133 usb_role_switch_match);
134
135 if (!IS_ERR_OR_NULL(sw))
136 WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
137
138 return sw;
139}
140EXPORT_SYMBOL_GPL(usb_role_switch_get);
141
142/**
143 * fwnode_usb_role_switch_get - Find USB role switch linked with the caller
144 * @fwnode: The caller device node
145 *
146 * This is similar to the usb_role_switch_get() function above, but it searches
147 * the switch using fwnode instead of device entry.
148 */
149struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
150{
151 struct usb_role_switch *sw;
152
153 sw = usb_role_switch_is_parent(fwnode);
154 if (!sw)
155 sw = fwnode_connection_find_match(fwnode, "usb-role-switch",
156 NULL, usb_role_switch_match);
157 if (!IS_ERR_OR_NULL(sw))
158 WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
159
160 return sw;
161}
162EXPORT_SYMBOL_GPL(fwnode_usb_role_switch_get);
163
164/**
165 * usb_role_switch_put - Release handle to a switch
166 * @sw: USB Role Switch
167 *
168 * Decrement reference count for @sw.
169 */
170void usb_role_switch_put(struct usb_role_switch *sw)
171{
172 if (!IS_ERR_OR_NULL(sw)) {
173 module_put(sw->dev.parent->driver->owner);
174 put_device(&sw->dev);
175 }
176}
177EXPORT_SYMBOL_GPL(usb_role_switch_put);
178
179/**
180 * usb_role_switch_find_by_fwnode - Find USB role switch with its fwnode
181 * @fwnode: fwnode of the USB Role Switch
182 *
183 * Finds and returns role switch with @fwnode. The reference count for the
184 * found switch is incremented.
185 */
186struct usb_role_switch *
187usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode)
188{
189 struct device *dev;
190
191 if (!fwnode)
192 return NULL;
193
194 dev = class_find_device_by_fwnode(role_class, fwnode);
195 if (dev)
196 WARN_ON(!try_module_get(dev->parent->driver->owner));
197
198 return dev ? to_role_switch(dev) : NULL;
199}
200EXPORT_SYMBOL_GPL(usb_role_switch_find_by_fwnode);
201
202static umode_t
203usb_role_switch_is_visible(struct kobject *kobj, struct attribute *attr, int n)
204{
205 struct device *dev = kobj_to_dev(kobj);
206 struct usb_role_switch *sw = to_role_switch(dev);
207
208 if (sw->allow_userspace_control)
209 return attr->mode;
210
211 return 0;
212}
213
214static const char * const usb_roles[] = {
215 [USB_ROLE_NONE] = "none",
216 [USB_ROLE_HOST] = "host",
217 [USB_ROLE_DEVICE] = "device",
218};
219
220const char *usb_role_string(enum usb_role role)
221{
222 if (role < 0 || role >= ARRAY_SIZE(usb_roles))
223 return "unknown";
224
225 return usb_roles[role];
226}
227EXPORT_SYMBOL_GPL(usb_role_string);
228
229static ssize_t
230role_show(struct device *dev, struct device_attribute *attr, char *buf)
231{
232 struct usb_role_switch *sw = to_role_switch(dev);
233 enum usb_role role = usb_role_switch_get_role(sw);
234
235 return sprintf(buf, "%s\n", usb_roles[role]);
236}
237
238static ssize_t role_store(struct device *dev, struct device_attribute *attr,
239 const char *buf, size_t size)
240{
241 struct usb_role_switch *sw = to_role_switch(dev);
242 int ret;
243
244 ret = sysfs_match_string(usb_roles, buf);
245 if (ret < 0) {
246 bool res;
247
248 /* Extra check if the user wants to disable the switch */
249 ret = kstrtobool(buf, &res);
250 if (ret || res)
251 return -EINVAL;
252 }
253
254 ret = usb_role_switch_set_role(sw, ret);
255 if (ret)
256 return ret;
257
258 return size;
259}
260static DEVICE_ATTR_RW(role);
261
262static struct attribute *usb_role_switch_attrs[] = {
263 &dev_attr_role.attr,
264 NULL,
265};
266
267static const struct attribute_group usb_role_switch_group = {
268 .is_visible = usb_role_switch_is_visible,
269 .attrs = usb_role_switch_attrs,
270};
271
272static const struct attribute_group *usb_role_switch_groups[] = {
273 &usb_role_switch_group,
274 NULL,
275};
276
277static int
278usb_role_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
279{
280 int ret;
281
282 ret = add_uevent_var(env, "USB_ROLE_SWITCH=%s", dev_name(dev));
283 if (ret)
284 dev_err(dev, "failed to add uevent USB_ROLE_SWITCH\n");
285
286 return ret;
287}
288
289static void usb_role_switch_release(struct device *dev)
290{
291 struct usb_role_switch *sw = to_role_switch(dev);
292
293 kfree(sw);
294}
295
296static const struct device_type usb_role_dev_type = {
297 .name = "usb_role_switch",
298 .groups = usb_role_switch_groups,
299 .uevent = usb_role_switch_uevent,
300 .release = usb_role_switch_release,
301};
302
303/**
304 * usb_role_switch_register - Register USB Role Switch
305 * @parent: Parent device for the switch
306 * @desc: Description of the switch
307 *
308 * USB Role Switch is a device capable or choosing the role for USB connector.
309 * On platforms where the USB controller is dual-role capable, the controller
310 * driver will need to register the switch. On platforms where the USB host and
311 * USB device controllers behind the connector are separate, there will be a
312 * mux, and the driver for that mux will need to register the switch.
313 *
314 * Returns handle to a new role switch or ERR_PTR. The content of @desc is
315 * copied.
316 */
317struct usb_role_switch *
318usb_role_switch_register(struct device *parent,
319 const struct usb_role_switch_desc *desc)
320{
321 struct usb_role_switch *sw;
322 int ret;
323
324 if (!desc || !desc->set)
325 return ERR_PTR(-EINVAL);
326
327 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
328 if (!sw)
329 return ERR_PTR(-ENOMEM);
330
331 mutex_init(&sw->lock);
332
333 sw->allow_userspace_control = desc->allow_userspace_control;
334 sw->usb2_port = desc->usb2_port;
335 sw->usb3_port = desc->usb3_port;
336 sw->udc = desc->udc;
337 sw->set = desc->set;
338 sw->get = desc->get;
339
340 sw->dev.parent = parent;
341 sw->dev.fwnode = desc->fwnode;
342 sw->dev.class = role_class;
343 sw->dev.type = &usb_role_dev_type;
344 dev_set_drvdata(&sw->dev, desc->driver_data);
345 dev_set_name(&sw->dev, "%s-role-switch",
346 desc->name ? desc->name : dev_name(parent));
347
348 ret = device_register(&sw->dev);
349 if (ret) {
350 put_device(&sw->dev);
351 return ERR_PTR(ret);
352 }
353
354 /* TODO: Symlinks for the host port and the device controller. */
355
356 return sw;
357}
358EXPORT_SYMBOL_GPL(usb_role_switch_register);
359
360/**
361 * usb_role_switch_unregister - Unregsiter USB Role Switch
362 * @sw: USB Role Switch
363 *
364 * Unregister switch that was registered with usb_role_switch_register().
365 */
366void usb_role_switch_unregister(struct usb_role_switch *sw)
367{
368 if (!IS_ERR_OR_NULL(sw))
369 device_unregister(&sw->dev);
370}
371EXPORT_SYMBOL_GPL(usb_role_switch_unregister);
372
373/**
374 * usb_role_switch_set_drvdata - Assign private data pointer to a switch
375 * @sw: USB Role Switch
376 * @data: Private data pointer
377 */
378void usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data)
379{
380 dev_set_drvdata(&sw->dev, data);
381}
382EXPORT_SYMBOL_GPL(usb_role_switch_set_drvdata);
383
384/**
385 * usb_role_switch_get_drvdata - Get the private data pointer of a switch
386 * @sw: USB Role Switch
387 */
388void *usb_role_switch_get_drvdata(struct usb_role_switch *sw)
389{
390 return dev_get_drvdata(&sw->dev);
391}
392EXPORT_SYMBOL_GPL(usb_role_switch_get_drvdata);
393
394static int __init usb_roles_init(void)
395{
396 role_class = class_create(THIS_MODULE, "usb_role");
397 return PTR_ERR_OR_ZERO(role_class);
398}
399subsys_initcall(usb_roles_init);
400
401static void __exit usb_roles_exit(void)
402{
403 class_destroy(role_class);
404}
405module_exit(usb_roles_exit);
406
407MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
408MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
409MODULE_LICENSE("GPL v2");
410MODULE_DESCRIPTION("USB Role Class");