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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Bus for USB Type-C Alternate Modes
4 *
5 * Copyright (C) 2018 Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
7 */
8
9#include <linux/usb/pd_vdo.h>
10
11#include "bus.h"
12#include "class.h"
13#include "mux.h"
14
15static inline int
16typec_altmode_set_mux(struct altmode *alt, unsigned long conf, void *data)
17{
18 struct typec_mux_state state;
19
20 if (!alt->mux)
21 return 0;
22
23 state.alt = &alt->adev;
24 state.mode = conf;
25 state.data = data;
26
27 return typec_mux_set(alt->mux, &state);
28}
29
30static int typec_altmode_set_state(struct typec_altmode *adev,
31 unsigned long conf, void *data)
32{
33 bool is_port = is_typec_port(adev->dev.parent);
34 struct altmode *port_altmode;
35
36 port_altmode = is_port ? to_altmode(adev) : to_altmode(adev)->partner;
37
38 return typec_altmode_set_mux(port_altmode, conf, data);
39}
40
41/* -------------------------------------------------------------------------- */
42/* Common API */
43
44/**
45 * typec_altmode_notify - Communication between the OS and alternate mode driver
46 * @adev: Handle to the alternate mode
47 * @conf: Alternate mode specific configuration value
48 * @data: Alternate mode specific data
49 *
50 * The primary purpose for this function is to allow the alternate mode drivers
51 * to tell which pin configuration has been negotiated with the partner. That
52 * information will then be used for example to configure the muxes.
53 * Communication to the other direction is also possible, and low level device
54 * drivers can also send notifications to the alternate mode drivers. The actual
55 * communication will be specific for every SVID.
56 */
57int typec_altmode_notify(struct typec_altmode *adev,
58 unsigned long conf, void *data)
59{
60 bool is_port;
61 struct altmode *altmode;
62 struct altmode *partner;
63 int ret;
64
65 if (!adev)
66 return 0;
67
68 altmode = to_altmode(adev);
69
70 if (!altmode->partner)
71 return -ENODEV;
72
73 is_port = is_typec_port(adev->dev.parent);
74 partner = altmode->partner;
75
76 ret = typec_altmode_set_mux(is_port ? altmode : partner, conf, data);
77 if (ret)
78 return ret;
79
80 if (partner->adev.ops && partner->adev.ops->notify)
81 return partner->adev.ops->notify(&partner->adev, conf, data);
82
83 return 0;
84}
85EXPORT_SYMBOL_GPL(typec_altmode_notify);
86
87/**
88 * typec_altmode_enter - Enter Mode
89 * @adev: The alternate mode
90 * @vdo: VDO for the Enter Mode command
91 *
92 * The alternate mode drivers use this function to enter mode. The port drivers
93 * use this to inform the alternate mode drivers that the partner has initiated
94 * Enter Mode command. If the alternate mode does not require VDO, @vdo must be
95 * NULL.
96 */
97int typec_altmode_enter(struct typec_altmode *adev, u32 *vdo)
98{
99 struct altmode *partner = to_altmode(adev)->partner;
100 struct typec_altmode *pdev = &partner->adev;
101 int ret;
102
103 if (!adev || adev->active)
104 return 0;
105
106 if (!pdev->ops || !pdev->ops->enter)
107 return -EOPNOTSUPP;
108
109 if (is_typec_port(pdev->dev.parent) && !pdev->active)
110 return -EPERM;
111
112 /* Moving to USB Safe State */
113 ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE, NULL);
114 if (ret)
115 return ret;
116
117 /* Enter Mode */
118 return pdev->ops->enter(pdev, vdo);
119}
120EXPORT_SYMBOL_GPL(typec_altmode_enter);
121
122/**
123 * typec_altmode_exit - Exit Mode
124 * @adev: The alternate mode
125 *
126 * The partner of @adev has initiated Exit Mode command.
127 */
128int typec_altmode_exit(struct typec_altmode *adev)
129{
130 struct altmode *partner = to_altmode(adev)->partner;
131 struct typec_altmode *pdev = &partner->adev;
132 int ret;
133
134 if (!adev || !adev->active)
135 return 0;
136
137 if (!pdev->ops || !pdev->ops->exit)
138 return -EOPNOTSUPP;
139
140 /* Moving to USB Safe State */
141 ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE, NULL);
142 if (ret)
143 return ret;
144
145 /* Exit Mode command */
146 return pdev->ops->exit(pdev);
147}
148EXPORT_SYMBOL_GPL(typec_altmode_exit);
149
150/**
151 * typec_altmode_attention - Attention command
152 * @adev: The alternate mode
153 * @vdo: VDO for the Attention command
154 *
155 * Notifies the partner of @adev about Attention command.
156 */
157void typec_altmode_attention(struct typec_altmode *adev, u32 vdo)
158{
159 struct typec_altmode *pdev = &to_altmode(adev)->partner->adev;
160
161 if (pdev->ops && pdev->ops->attention)
162 pdev->ops->attention(pdev, vdo);
163}
164EXPORT_SYMBOL_GPL(typec_altmode_attention);
165
166/**
167 * typec_altmode_vdm - Send Vendor Defined Messages (VDM) to the partner
168 * @adev: Alternate mode handle
169 * @header: VDM Header
170 * @vdo: Array of Vendor Defined Data Objects
171 * @count: Number of Data Objects
172 *
173 * The alternate mode drivers use this function for SVID specific communication
174 * with the partner. The port drivers use it to deliver the Structured VDMs
175 * received from the partners to the alternate mode drivers.
176 */
177int typec_altmode_vdm(struct typec_altmode *adev,
178 const u32 header, const u32 *vdo, int count)
179{
180 struct typec_altmode *pdev;
181 struct altmode *altmode;
182
183 if (!adev)
184 return 0;
185
186 altmode = to_altmode(adev);
187
188 if (!altmode->partner)
189 return -ENODEV;
190
191 pdev = &altmode->partner->adev;
192
193 if (!pdev->ops || !pdev->ops->vdm)
194 return -EOPNOTSUPP;
195
196 return pdev->ops->vdm(pdev, header, vdo, count);
197}
198EXPORT_SYMBOL_GPL(typec_altmode_vdm);
199
200const struct typec_altmode *
201typec_altmode_get_partner(struct typec_altmode *adev)
202{
203 if (!adev || !to_altmode(adev)->partner)
204 return NULL;
205
206 return &to_altmode(adev)->partner->adev;
207}
208EXPORT_SYMBOL_GPL(typec_altmode_get_partner);
209
210/* -------------------------------------------------------------------------- */
211/* API for the alternate mode drivers */
212
213/**
214 * typec_altmode_get_plug - Find cable plug alternate mode
215 * @adev: Handle to partner alternate mode
216 * @index: Cable plug index
217 *
218 * Increment reference count for cable plug alternate mode device. Returns
219 * handle to the cable plug alternate mode, or NULL if none is found.
220 */
221struct typec_altmode *typec_altmode_get_plug(struct typec_altmode *adev,
222 enum typec_plug_index index)
223{
224 struct altmode *port = to_altmode(adev)->partner;
225
226 if (port->plug[index]) {
227 get_device(&port->plug[index]->adev.dev);
228 return &port->plug[index]->adev;
229 }
230
231 return NULL;
232}
233EXPORT_SYMBOL_GPL(typec_altmode_get_plug);
234
235/**
236 * typec_altmode_put_plug - Decrement cable plug alternate mode reference count
237 * @plug: Handle to the cable plug alternate mode
238 */
239void typec_altmode_put_plug(struct typec_altmode *plug)
240{
241 if (plug)
242 put_device(&plug->dev);
243}
244EXPORT_SYMBOL_GPL(typec_altmode_put_plug);
245
246int __typec_altmode_register_driver(struct typec_altmode_driver *drv,
247 struct module *module)
248{
249 if (!drv->probe)
250 return -EINVAL;
251
252 drv->driver.owner = module;
253 drv->driver.bus = &typec_bus;
254
255 return driver_register(&drv->driver);
256}
257EXPORT_SYMBOL_GPL(__typec_altmode_register_driver);
258
259void typec_altmode_unregister_driver(struct typec_altmode_driver *drv)
260{
261 driver_unregister(&drv->driver);
262}
263EXPORT_SYMBOL_GPL(typec_altmode_unregister_driver);
264
265/* -------------------------------------------------------------------------- */
266/* API for the port drivers */
267
268/**
269 * typec_match_altmode - Match SVID and mode to an array of alternate modes
270 * @altmodes: Array of alternate modes
271 * @n: Number of elements in the array, or -1 for NULL terminated arrays
272 * @svid: Standard or Vendor ID to match with
273 * @mode: Mode to match with
274 *
275 * Return pointer to an alternate mode with SVID matching @svid, or NULL when no
276 * match is found.
277 */
278struct typec_altmode *typec_match_altmode(struct typec_altmode **altmodes,
279 size_t n, u16 svid, u8 mode)
280{
281 int i;
282
283 for (i = 0; i < n; i++) {
284 if (!altmodes[i])
285 break;
286 if (altmodes[i]->svid == svid && altmodes[i]->mode == mode)
287 return altmodes[i];
288 }
289
290 return NULL;
291}
292EXPORT_SYMBOL_GPL(typec_match_altmode);
293
294/* -------------------------------------------------------------------------- */
295
296static ssize_t
297description_show(struct device *dev, struct device_attribute *attr, char *buf)
298{
299 struct typec_altmode *alt = to_typec_altmode(dev);
300
301 return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
302}
303static DEVICE_ATTR_RO(description);
304
305static struct attribute *typec_attrs[] = {
306 &dev_attr_description.attr,
307 NULL
308};
309ATTRIBUTE_GROUPS(typec);
310
311static int typec_match(struct device *dev, struct device_driver *driver)
312{
313 struct typec_altmode_driver *drv = to_altmode_driver(driver);
314 struct typec_altmode *altmode = to_typec_altmode(dev);
315 const struct typec_device_id *id;
316
317 for (id = drv->id_table; id->svid; id++)
318 if (id->svid == altmode->svid &&
319 (id->mode == TYPEC_ANY_MODE || id->mode == altmode->mode))
320 return 1;
321 return 0;
322}
323
324static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
325{
326 struct typec_altmode *altmode = to_typec_altmode(dev);
327
328 if (add_uevent_var(env, "SVID=%04X", altmode->svid))
329 return -ENOMEM;
330
331 if (add_uevent_var(env, "MODE=%u", altmode->mode))
332 return -ENOMEM;
333
334 return add_uevent_var(env, "MODALIAS=typec:id%04Xm%02X",
335 altmode->svid, altmode->mode);
336}
337
338static int typec_altmode_create_links(struct altmode *alt)
339{
340 struct device *port_dev = &alt->partner->adev.dev;
341 struct device *dev = &alt->adev.dev;
342 int err;
343
344 err = sysfs_create_link(&dev->kobj, &port_dev->kobj, "port");
345 if (err)
346 return err;
347
348 err = sysfs_create_link(&port_dev->kobj, &dev->kobj, "partner");
349 if (err)
350 sysfs_remove_link(&dev->kobj, "port");
351
352 return err;
353}
354
355static void typec_altmode_remove_links(struct altmode *alt)
356{
357 sysfs_remove_link(&alt->partner->adev.dev.kobj, "partner");
358 sysfs_remove_link(&alt->adev.dev.kobj, "port");
359}
360
361static int typec_probe(struct device *dev)
362{
363 struct typec_altmode_driver *drv = to_altmode_driver(dev->driver);
364 struct typec_altmode *adev = to_typec_altmode(dev);
365 struct altmode *altmode = to_altmode(adev);
366 int ret;
367
368 /* Fail if the port does not support the alternate mode */
369 if (!altmode->partner)
370 return -ENODEV;
371
372 ret = typec_altmode_create_links(altmode);
373 if (ret) {
374 dev_warn(dev, "failed to create symlinks\n");
375 return ret;
376 }
377
378 ret = drv->probe(adev);
379 if (ret)
380 typec_altmode_remove_links(altmode);
381
382 return ret;
383}
384
385static void typec_remove(struct device *dev)
386{
387 struct typec_altmode_driver *drv = to_altmode_driver(dev->driver);
388 struct typec_altmode *adev = to_typec_altmode(dev);
389 struct altmode *altmode = to_altmode(adev);
390
391 typec_altmode_remove_links(altmode);
392
393 if (drv->remove)
394 drv->remove(to_typec_altmode(dev));
395
396 if (adev->active) {
397 WARN_ON(typec_altmode_set_state(adev, TYPEC_STATE_SAFE, NULL));
398 typec_altmode_update_active(adev, false);
399 }
400
401 adev->desc = NULL;
402 adev->ops = NULL;
403}
404
405struct bus_type typec_bus = {
406 .name = "typec",
407 .dev_groups = typec_groups,
408 .match = typec_match,
409 .uevent = typec_uevent,
410 .probe = typec_probe,
411 .remove = typec_remove,
412};
1// SPDX-License-Identifier: GPL-2.0
2/**
3 * Bus for USB Type-C Alternate Modes
4 *
5 * Copyright (C) 2018 Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
7 */
8
9#include <linux/usb/pd_vdo.h>
10
11#include "bus.h"
12
13static inline int typec_altmode_set_mux(struct altmode *alt, u8 state)
14{
15 return alt->mux ? alt->mux->set(alt->mux, state) : 0;
16}
17
18static int typec_altmode_set_state(struct typec_altmode *adev, int state)
19{
20 bool is_port = is_typec_port(adev->dev.parent);
21 struct altmode *port_altmode;
22 int ret;
23
24 port_altmode = is_port ? to_altmode(adev) : to_altmode(adev)->partner;
25
26 ret = typec_altmode_set_mux(port_altmode, state);
27 if (ret)
28 return ret;
29
30 blocking_notifier_call_chain(&port_altmode->nh, state, NULL);
31
32 return 0;
33}
34
35/* -------------------------------------------------------------------------- */
36/* Common API */
37
38/**
39 * typec_altmode_notify - Communication between the OS and alternate mode driver
40 * @adev: Handle to the alternate mode
41 * @conf: Alternate mode specific configuration value
42 * @data: Alternate mode specific data
43 *
44 * The primary purpose for this function is to allow the alternate mode drivers
45 * to tell which pin configuration has been negotiated with the partner. That
46 * information will then be used for example to configure the muxes.
47 * Communication to the other direction is also possible, and low level device
48 * drivers can also send notifications to the alternate mode drivers. The actual
49 * communication will be specific for every SVID.
50 */
51int typec_altmode_notify(struct typec_altmode *adev,
52 unsigned long conf, void *data)
53{
54 bool is_port;
55 struct altmode *altmode;
56 struct altmode *partner;
57 int ret;
58
59 if (!adev)
60 return 0;
61
62 altmode = to_altmode(adev);
63
64 if (!altmode->partner)
65 return -ENODEV;
66
67 is_port = is_typec_port(adev->dev.parent);
68 partner = altmode->partner;
69
70 ret = typec_altmode_set_mux(is_port ? altmode : partner, (u8)conf);
71 if (ret)
72 return ret;
73
74 blocking_notifier_call_chain(is_port ? &altmode->nh : &partner->nh,
75 conf, data);
76
77 if (partner->adev.ops && partner->adev.ops->notify)
78 return partner->adev.ops->notify(&partner->adev, conf, data);
79
80 return 0;
81}
82EXPORT_SYMBOL_GPL(typec_altmode_notify);
83
84/**
85 * typec_altmode_enter - Enter Mode
86 * @adev: The alternate mode
87 *
88 * The alternate mode drivers use this function to enter mode. The port drivers
89 * use this to inform the alternate mode drivers that the partner has initiated
90 * Enter Mode command.
91 */
92int typec_altmode_enter(struct typec_altmode *adev)
93{
94 struct altmode *partner = to_altmode(adev)->partner;
95 struct typec_altmode *pdev = &partner->adev;
96 int ret;
97
98 if (!adev || adev->active)
99 return 0;
100
101 if (!pdev->ops || !pdev->ops->enter)
102 return -EOPNOTSUPP;
103
104 /* Moving to USB Safe State */
105 ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE);
106 if (ret)
107 return ret;
108
109 /* Enter Mode */
110 return pdev->ops->enter(pdev);
111}
112EXPORT_SYMBOL_GPL(typec_altmode_enter);
113
114/**
115 * typec_altmode_exit - Exit Mode
116 * @adev: The alternate mode
117 *
118 * The partner of @adev has initiated Exit Mode command.
119 */
120int typec_altmode_exit(struct typec_altmode *adev)
121{
122 struct altmode *partner = to_altmode(adev)->partner;
123 struct typec_altmode *pdev = &partner->adev;
124 int ret;
125
126 if (!adev || !adev->active)
127 return 0;
128
129 if (!pdev->ops || !pdev->ops->enter)
130 return -EOPNOTSUPP;
131
132 /* Moving to USB Safe State */
133 ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE);
134 if (ret)
135 return ret;
136
137 /* Exit Mode command */
138 return pdev->ops->exit(pdev);
139}
140EXPORT_SYMBOL_GPL(typec_altmode_exit);
141
142/**
143 * typec_altmode_attention - Attention command
144 * @adev: The alternate mode
145 * @vdo: VDO for the Attention command
146 *
147 * Notifies the partner of @adev about Attention command.
148 */
149void typec_altmode_attention(struct typec_altmode *adev, u32 vdo)
150{
151 struct typec_altmode *pdev = &to_altmode(adev)->partner->adev;
152
153 if (pdev->ops && pdev->ops->attention)
154 pdev->ops->attention(pdev, vdo);
155}
156EXPORT_SYMBOL_GPL(typec_altmode_attention);
157
158/**
159 * typec_altmode_vdm - Send Vendor Defined Messages (VDM) to the partner
160 * @adev: Alternate mode handle
161 * @header: VDM Header
162 * @vdo: Array of Vendor Defined Data Objects
163 * @count: Number of Data Objects
164 *
165 * The alternate mode drivers use this function for SVID specific communication
166 * with the partner. The port drivers use it to deliver the Structured VDMs
167 * received from the partners to the alternate mode drivers.
168 */
169int typec_altmode_vdm(struct typec_altmode *adev,
170 const u32 header, const u32 *vdo, int count)
171{
172 struct typec_altmode *pdev;
173 struct altmode *altmode;
174
175 if (!adev)
176 return 0;
177
178 altmode = to_altmode(adev);
179
180 if (!altmode->partner)
181 return -ENODEV;
182
183 pdev = &altmode->partner->adev;
184
185 if (!pdev->ops || !pdev->ops->vdm)
186 return -EOPNOTSUPP;
187
188 return pdev->ops->vdm(pdev, header, vdo, count);
189}
190EXPORT_SYMBOL_GPL(typec_altmode_vdm);
191
192const struct typec_altmode *
193typec_altmode_get_partner(struct typec_altmode *adev)
194{
195 return adev ? &to_altmode(adev)->partner->adev : NULL;
196}
197EXPORT_SYMBOL_GPL(typec_altmode_get_partner);
198
199/* -------------------------------------------------------------------------- */
200/* API for the alternate mode drivers */
201
202/**
203 * typec_altmode_get_plug - Find cable plug alternate mode
204 * @adev: Handle to partner alternate mode
205 * @index: Cable plug index
206 *
207 * Increment reference count for cable plug alternate mode device. Returns
208 * handle to the cable plug alternate mode, or NULL if none is found.
209 */
210struct typec_altmode *typec_altmode_get_plug(struct typec_altmode *adev,
211 enum typec_plug_index index)
212{
213 struct altmode *port = to_altmode(adev)->partner;
214
215 if (port->plug[index]) {
216 get_device(&port->plug[index]->adev.dev);
217 return &port->plug[index]->adev;
218 }
219
220 return NULL;
221}
222EXPORT_SYMBOL_GPL(typec_altmode_get_plug);
223
224/**
225 * typec_altmode_put_plug - Decrement cable plug alternate mode reference count
226 * @plug: Handle to the cable plug alternate mode
227 */
228void typec_altmode_put_plug(struct typec_altmode *plug)
229{
230 if (plug)
231 put_device(&plug->dev);
232}
233EXPORT_SYMBOL_GPL(typec_altmode_put_plug);
234
235int __typec_altmode_register_driver(struct typec_altmode_driver *drv,
236 struct module *module)
237{
238 if (!drv->probe)
239 return -EINVAL;
240
241 drv->driver.owner = module;
242 drv->driver.bus = &typec_bus;
243
244 return driver_register(&drv->driver);
245}
246EXPORT_SYMBOL_GPL(__typec_altmode_register_driver);
247
248void typec_altmode_unregister_driver(struct typec_altmode_driver *drv)
249{
250 driver_unregister(&drv->driver);
251}
252EXPORT_SYMBOL_GPL(typec_altmode_unregister_driver);
253
254/* -------------------------------------------------------------------------- */
255/* API for the port drivers */
256
257/**
258 * typec_match_altmode - Match SVID and mode to an array of alternate modes
259 * @altmodes: Array of alternate modes
260 * @n: Number of elements in the array, or -1 for NULL terminated arrays
261 * @svid: Standard or Vendor ID to match with
262 * @mode: Mode to match with
263 *
264 * Return pointer to an alternate mode with SVID matching @svid, or NULL when no
265 * match is found.
266 */
267struct typec_altmode *typec_match_altmode(struct typec_altmode **altmodes,
268 size_t n, u16 svid, u8 mode)
269{
270 int i;
271
272 for (i = 0; i < n; i++) {
273 if (!altmodes[i])
274 break;
275 if (altmodes[i]->svid == svid && altmodes[i]->mode == mode)
276 return altmodes[i];
277 }
278
279 return NULL;
280}
281EXPORT_SYMBOL_GPL(typec_match_altmode);
282
283/* -------------------------------------------------------------------------- */
284
285static ssize_t
286description_show(struct device *dev, struct device_attribute *attr, char *buf)
287{
288 struct typec_altmode *alt = to_typec_altmode(dev);
289
290 return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
291}
292static DEVICE_ATTR_RO(description);
293
294static struct attribute *typec_attrs[] = {
295 &dev_attr_description.attr,
296 NULL
297};
298ATTRIBUTE_GROUPS(typec);
299
300static int typec_match(struct device *dev, struct device_driver *driver)
301{
302 struct typec_altmode_driver *drv = to_altmode_driver(driver);
303 struct typec_altmode *altmode = to_typec_altmode(dev);
304 const struct typec_device_id *id;
305
306 for (id = drv->id_table; id->svid; id++)
307 if (id->svid == altmode->svid &&
308 (id->mode == TYPEC_ANY_MODE || id->mode == altmode->mode))
309 return 1;
310 return 0;
311}
312
313static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
314{
315 struct typec_altmode *altmode = to_typec_altmode(dev);
316
317 if (add_uevent_var(env, "SVID=%04X", altmode->svid))
318 return -ENOMEM;
319
320 if (add_uevent_var(env, "MODE=%u", altmode->mode))
321 return -ENOMEM;
322
323 return add_uevent_var(env, "MODALIAS=typec:id%04Xm%02X",
324 altmode->svid, altmode->mode);
325}
326
327static int typec_altmode_create_links(struct altmode *alt)
328{
329 struct device *port_dev = &alt->partner->adev.dev;
330 struct device *dev = &alt->adev.dev;
331 int err;
332
333 err = sysfs_create_link(&dev->kobj, &port_dev->kobj, "port");
334 if (err)
335 return err;
336
337 err = sysfs_create_link(&port_dev->kobj, &dev->kobj, "partner");
338 if (err)
339 sysfs_remove_link(&dev->kobj, "port");
340
341 return err;
342}
343
344static void typec_altmode_remove_links(struct altmode *alt)
345{
346 sysfs_remove_link(&alt->partner->adev.dev.kobj, "partner");
347 sysfs_remove_link(&alt->adev.dev.kobj, "port");
348}
349
350static int typec_probe(struct device *dev)
351{
352 struct typec_altmode_driver *drv = to_altmode_driver(dev->driver);
353 struct typec_altmode *adev = to_typec_altmode(dev);
354 struct altmode *altmode = to_altmode(adev);
355 int ret;
356
357 /* Fail if the port does not support the alternate mode */
358 if (!altmode->partner)
359 return -ENODEV;
360
361 ret = typec_altmode_create_links(altmode);
362 if (ret) {
363 dev_warn(dev, "failed to create symlinks\n");
364 return ret;
365 }
366
367 ret = drv->probe(adev);
368 if (ret)
369 typec_altmode_remove_links(altmode);
370
371 return ret;
372}
373
374static int typec_remove(struct device *dev)
375{
376 struct typec_altmode_driver *drv = to_altmode_driver(dev->driver);
377 struct typec_altmode *adev = to_typec_altmode(dev);
378 struct altmode *altmode = to_altmode(adev);
379
380 typec_altmode_remove_links(altmode);
381
382 if (drv->remove)
383 drv->remove(to_typec_altmode(dev));
384
385 if (adev->active) {
386 WARN_ON(typec_altmode_set_state(adev, TYPEC_STATE_SAFE));
387 typec_altmode_update_active(adev, false);
388 }
389
390 adev->desc = NULL;
391 adev->ops = NULL;
392
393 return 0;
394}
395
396struct bus_type typec_bus = {
397 .name = "typec",
398 .dev_groups = typec_groups,
399 .match = typec_match,
400 .uevent = typec_uevent,
401 .probe = typec_probe,
402 .remove = typec_remove,
403};