1 // SPDX-License-Identifier: GPL-2.0
3 * Bus for USB Type-C Alternate Modes
5 * Copyright (C) 2018 Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
9 #include <linux/usb/pd_vdo.h>
14 typec_altmode_set_mux(struct altmode *alt, unsigned long conf, void *data)
16 struct typec_mux_state state;
21 state.alt = &alt->adev;
25 return alt->mux->set(alt->mux, &state);
28 static int typec_altmode_set_state(struct typec_altmode *adev,
29 unsigned long conf, void *data)
31 bool is_port = is_typec_port(adev->dev.parent);
32 struct altmode *port_altmode;
34 port_altmode = is_port ? to_altmode(adev) : to_altmode(adev)->partner;
36 return typec_altmode_set_mux(port_altmode, conf, data);
39 /* -------------------------------------------------------------------------- */
43 * typec_altmode_notify - Communication between the OS and alternate mode driver
44 * @adev: Handle to the alternate mode
45 * @conf: Alternate mode specific configuration value
46 * @data: Alternate mode specific data
48 * The primary purpose for this function is to allow the alternate mode drivers
49 * to tell which pin configuration has been negotiated with the partner. That
50 * information will then be used for example to configure the muxes.
51 * Communication to the other direction is also possible, and low level device
52 * drivers can also send notifications to the alternate mode drivers. The actual
53 * communication will be specific for every SVID.
55 int typec_altmode_notify(struct typec_altmode *adev,
56 unsigned long conf, void *data)
59 struct altmode *altmode;
60 struct altmode *partner;
66 altmode = to_altmode(adev);
68 if (!altmode->partner)
71 is_port = is_typec_port(adev->dev.parent);
72 partner = altmode->partner;
74 ret = typec_altmode_set_mux(is_port ? altmode : partner, conf, data);
78 if (partner->adev.ops && partner->adev.ops->notify)
79 return partner->adev.ops->notify(&partner->adev, conf, data);
83 EXPORT_SYMBOL_GPL(typec_altmode_notify);
86 * typec_altmode_enter - Enter Mode
87 * @adev: The alternate mode
88 * @vdo: VDO for the Enter Mode command
90 * The alternate mode drivers use this function to enter mode. The port drivers
91 * use this to inform the alternate mode drivers that the partner has initiated
92 * Enter Mode command. If the alternate mode does not require VDO, @vdo must be
95 int typec_altmode_enter(struct typec_altmode *adev, u32 *vdo)
97 struct altmode *partner = to_altmode(adev)->partner;
98 struct typec_altmode *pdev = &partner->adev;
101 if (!adev || adev->active)
104 if (!pdev->ops || !pdev->ops->enter)
107 if (is_typec_port(pdev->dev.parent) && !pdev->active)
110 /* Moving to USB Safe State */
111 ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE, NULL);
116 return pdev->ops->enter(pdev, vdo);
118 EXPORT_SYMBOL_GPL(typec_altmode_enter);
121 * typec_altmode_exit - Exit Mode
122 * @adev: The alternate mode
124 * The partner of @adev has initiated Exit Mode command.
126 int typec_altmode_exit(struct typec_altmode *adev)
128 struct altmode *partner = to_altmode(adev)->partner;
129 struct typec_altmode *pdev = &partner->adev;
132 if (!adev || !adev->active)
135 if (!pdev->ops || !pdev->ops->exit)
138 /* Moving to USB Safe State */
139 ret = typec_altmode_set_state(adev, TYPEC_STATE_SAFE, NULL);
143 /* Exit Mode command */
144 return pdev->ops->exit(pdev);
146 EXPORT_SYMBOL_GPL(typec_altmode_exit);
149 * typec_altmode_attention - Attention command
150 * @adev: The alternate mode
151 * @vdo: VDO for the Attention command
153 * Notifies the partner of @adev about Attention command.
155 int typec_altmode_attention(struct typec_altmode *adev, u32 vdo)
157 struct altmode *partner = to_altmode(adev)->partner;
158 struct typec_altmode *pdev;
163 pdev = &partner->adev;
165 if (pdev->ops && pdev->ops->attention)
166 pdev->ops->attention(pdev, vdo);
170 EXPORT_SYMBOL_GPL(typec_altmode_attention);
173 * typec_altmode_vdm - Send Vendor Defined Messages (VDM) to the partner
174 * @adev: Alternate mode handle
175 * @header: VDM Header
176 * @vdo: Array of Vendor Defined Data Objects
177 * @count: Number of Data Objects
179 * The alternate mode drivers use this function for SVID specific communication
180 * with the partner. The port drivers use it to deliver the Structured VDMs
181 * received from the partners to the alternate mode drivers.
183 int typec_altmode_vdm(struct typec_altmode *adev,
184 const u32 header, const u32 *vdo, int count)
186 struct typec_altmode *pdev;
187 struct altmode *altmode;
192 altmode = to_altmode(adev);
194 if (!altmode->partner)
197 pdev = &altmode->partner->adev;
199 if (!pdev->ops || !pdev->ops->vdm)
202 return pdev->ops->vdm(pdev, header, vdo, count);
204 EXPORT_SYMBOL_GPL(typec_altmode_vdm);
206 const struct typec_altmode *
207 typec_altmode_get_partner(struct typec_altmode *adev)
209 if (!adev || !to_altmode(adev)->partner)
212 return &to_altmode(adev)->partner->adev;
214 EXPORT_SYMBOL_GPL(typec_altmode_get_partner);
216 /* -------------------------------------------------------------------------- */
217 /* API for the alternate mode drivers */
220 * typec_altmode_get_plug - Find cable plug alternate mode
221 * @adev: Handle to partner alternate mode
222 * @index: Cable plug index
224 * Increment reference count for cable plug alternate mode device. Returns
225 * handle to the cable plug alternate mode, or NULL if none is found.
227 struct typec_altmode *typec_altmode_get_plug(struct typec_altmode *adev,
228 enum typec_plug_index index)
230 struct altmode *port = to_altmode(adev)->partner;
232 if (port->plug[index]) {
233 get_device(&port->plug[index]->adev.dev);
234 return &port->plug[index]->adev;
239 EXPORT_SYMBOL_GPL(typec_altmode_get_plug);
242 * typec_altmode_put_plug - Decrement cable plug alternate mode reference count
243 * @plug: Handle to the cable plug alternate mode
245 void typec_altmode_put_plug(struct typec_altmode *plug)
248 put_device(&plug->dev);
250 EXPORT_SYMBOL_GPL(typec_altmode_put_plug);
252 int __typec_altmode_register_driver(struct typec_altmode_driver *drv,
253 struct module *module)
258 drv->driver.owner = module;
259 drv->driver.bus = &typec_bus;
261 return driver_register(&drv->driver);
263 EXPORT_SYMBOL_GPL(__typec_altmode_register_driver);
265 void typec_altmode_unregister_driver(struct typec_altmode_driver *drv)
267 driver_unregister(&drv->driver);
269 EXPORT_SYMBOL_GPL(typec_altmode_unregister_driver);
271 /* -------------------------------------------------------------------------- */
272 /* API for the port drivers */
275 * typec_match_altmode - Match SVID and mode to an array of alternate modes
276 * @altmodes: Array of alternate modes
277 * @n: Number of elements in the array, or -1 for NULL terminated arrays
278 * @svid: Standard or Vendor ID to match with
279 * @mode: Mode to match with
281 * Return pointer to an alternate mode with SVID matching @svid, or NULL when no
284 struct typec_altmode *typec_match_altmode(struct typec_altmode **altmodes,
285 size_t n, u16 svid, u8 mode)
289 for (i = 0; i < n; i++) {
292 if (altmodes[i]->svid == svid && altmodes[i]->mode == mode)
298 EXPORT_SYMBOL_GPL(typec_match_altmode);
300 /* -------------------------------------------------------------------------- */
303 description_show(struct device *dev, struct device_attribute *attr, char *buf)
305 struct typec_altmode *alt = to_typec_altmode(dev);
307 return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
309 static DEVICE_ATTR_RO(description);
311 static struct attribute *typec_attrs[] = {
312 &dev_attr_description.attr,
315 ATTRIBUTE_GROUPS(typec);
317 static int typec_match(struct device *dev, struct device_driver *driver)
319 struct typec_altmode_driver *drv = to_altmode_driver(driver);
320 struct typec_altmode *altmode = to_typec_altmode(dev);
321 const struct typec_device_id *id;
323 for (id = drv->id_table; id->svid; id++)
324 if (id->svid == altmode->svid &&
325 (id->mode == TYPEC_ANY_MODE || id->mode == altmode->mode))
330 static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
332 struct typec_altmode *altmode = to_typec_altmode(dev);
334 if (add_uevent_var(env, "SVID=%04X", altmode->svid))
337 if (add_uevent_var(env, "MODE=%u", altmode->mode))
340 return add_uevent_var(env, "MODALIAS=typec:id%04Xm%02X",
341 altmode->svid, altmode->mode);
344 static int typec_altmode_create_links(struct altmode *alt)
346 struct device *port_dev = &alt->partner->adev.dev;
347 struct device *dev = &alt->adev.dev;
350 err = sysfs_create_link(&dev->kobj, &port_dev->kobj, "port");
354 err = sysfs_create_link(&port_dev->kobj, &dev->kobj, "partner");
356 sysfs_remove_link(&dev->kobj, "port");
361 static void typec_altmode_remove_links(struct altmode *alt)
363 sysfs_remove_link(&alt->partner->adev.dev.kobj, "partner");
364 sysfs_remove_link(&alt->adev.dev.kobj, "port");
367 static int typec_probe(struct device *dev)
369 struct typec_altmode_driver *drv = to_altmode_driver(dev->driver);
370 struct typec_altmode *adev = to_typec_altmode(dev);
371 struct altmode *altmode = to_altmode(adev);
374 /* Fail if the port does not support the alternate mode */
375 if (!altmode->partner)
378 ret = typec_altmode_create_links(altmode);
380 dev_warn(dev, "failed to create symlinks\n");
384 ret = drv->probe(adev);
386 typec_altmode_remove_links(altmode);
391 static int typec_remove(struct device *dev)
393 struct typec_altmode_driver *drv = to_altmode_driver(dev->driver);
394 struct typec_altmode *adev = to_typec_altmode(dev);
395 struct altmode *altmode = to_altmode(adev);
397 typec_altmode_remove_links(altmode);
400 drv->remove(to_typec_altmode(dev));
403 WARN_ON(typec_altmode_set_state(adev, TYPEC_STATE_SAFE, NULL));
404 typec_altmode_update_active(adev, false);
413 struct bus_type typec_bus = {
415 .dev_groups = typec_groups,
416 .match = typec_match,
417 .uevent = typec_uevent,
418 .probe = typec_probe,
419 .remove = typec_remove,