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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}
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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);
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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
105 ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE);
106 if (ret)
107 return ret;
108
109
110 return pdev->ops->enter(pdev);
111}
112EXPORT_SYMBOL_GPL(typec_altmode_enter);
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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
133 ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE);
134 if (ret)
135 return ret;
136
137
138 return pdev->ops->exit(pdev);
139}
140EXPORT_SYMBOL_GPL(typec_altmode_exit);
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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);
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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);
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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);
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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);
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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
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};
404