1
2
3
4
5
6
7#include <linux/extcon-provider.h>
8#include <linux/kernel.h>
9#include <linux/mfd/cros_ec.h>
10#include <linux/module.h>
11#include <linux/notifier.h>
12#include <linux/of.h>
13#include <linux/platform_device.h>
14#include <linux/slab.h>
15#include <linux/sched.h>
16
17struct cros_ec_extcon_info {
18 struct device *dev;
19 struct extcon_dev *edev;
20
21 int port_id;
22
23 struct cros_ec_device *ec;
24
25 struct notifier_block notifier;
26
27 unsigned int dr;
28 bool pr;
29 bool dp;
30 bool mux;
31 unsigned int power_type;
32};
33
34static const unsigned int usb_type_c_cable[] = {
35 EXTCON_USB,
36 EXTCON_USB_HOST,
37 EXTCON_DISP_DP,
38 EXTCON_NONE,
39};
40
41enum usb_data_roles {
42 DR_NONE,
43 DR_HOST,
44 DR_DEVICE,
45};
46
47
48
49
50
51
52
53
54
55
56
57
58
59static int cros_ec_pd_command(struct cros_ec_extcon_info *info,
60 unsigned int command,
61 unsigned int version,
62 void *outdata,
63 unsigned int outsize,
64 void *indata,
65 unsigned int insize)
66{
67 struct cros_ec_command *msg;
68 int ret;
69
70 msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
71 if (!msg)
72 return -ENOMEM;
73
74 msg->version = version;
75 msg->command = command;
76 msg->outsize = outsize;
77 msg->insize = insize;
78
79 if (outsize)
80 memcpy(msg->data, outdata, outsize);
81
82 ret = cros_ec_cmd_xfer_status(info->ec, msg);
83 if (ret >= 0 && insize)
84 memcpy(indata, msg->data, insize);
85
86 kfree(msg);
87 return ret;
88}
89
90
91
92
93
94
95
96
97static int cros_ec_usb_get_power_type(struct cros_ec_extcon_info *info)
98{
99 struct ec_params_usb_pd_power_info req;
100 struct ec_response_usb_pd_power_info resp;
101 int ret;
102
103 req.port = info->port_id;
104 ret = cros_ec_pd_command(info, EC_CMD_USB_PD_POWER_INFO, 0,
105 &req, sizeof(req), &resp, sizeof(resp));
106 if (ret < 0)
107 return ret;
108
109 return resp.type;
110}
111
112
113
114
115
116
117
118static int cros_ec_usb_get_pd_mux_state(struct cros_ec_extcon_info *info)
119{
120 struct ec_params_usb_pd_mux_info req;
121 struct ec_response_usb_pd_mux_info resp;
122 int ret;
123
124 req.port = info->port_id;
125 ret = cros_ec_pd_command(info, EC_CMD_USB_PD_MUX_INFO, 0,
126 &req, sizeof(req),
127 &resp, sizeof(resp));
128 if (ret < 0)
129 return ret;
130
131 return resp.flags;
132}
133
134
135
136
137
138
139
140
141
142
143static int cros_ec_usb_get_role(struct cros_ec_extcon_info *info,
144 bool *polarity)
145{
146 struct ec_params_usb_pd_control pd_control;
147 struct ec_response_usb_pd_control_v1 resp;
148 int ret;
149
150 pd_control.port = info->port_id;
151 pd_control.role = USB_PD_CTRL_ROLE_NO_CHANGE;
152 pd_control.mux = USB_PD_CTRL_MUX_NO_CHANGE;
153 pd_control.swap = USB_PD_CTRL_SWAP_NONE;
154 ret = cros_ec_pd_command(info, EC_CMD_USB_PD_CONTROL, 1,
155 &pd_control, sizeof(pd_control),
156 &resp, sizeof(resp));
157 if (ret < 0)
158 return ret;
159
160 if (!(resp.enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
161 return -ENOTCONN;
162
163 *polarity = resp.polarity;
164
165 return resp.role;
166}
167
168
169
170
171
172
173
174static int cros_ec_pd_get_num_ports(struct cros_ec_extcon_info *info)
175{
176 struct ec_response_usb_pd_ports resp;
177 int ret;
178
179 ret = cros_ec_pd_command(info, EC_CMD_USB_PD_PORTS,
180 0, NULL, 0, &resp, sizeof(resp));
181 if (ret < 0)
182 return ret;
183
184 return resp.num_ports;
185}
186
187static const char *cros_ec_usb_role_string(unsigned int role)
188{
189 return role == DR_NONE ? "DISCONNECTED" :
190 (role == DR_HOST ? "DFP" : "UFP");
191}
192
193static const char *cros_ec_usb_power_type_string(unsigned int type)
194{
195 switch (type) {
196 case USB_CHG_TYPE_NONE:
197 return "USB_CHG_TYPE_NONE";
198 case USB_CHG_TYPE_PD:
199 return "USB_CHG_TYPE_PD";
200 case USB_CHG_TYPE_PROPRIETARY:
201 return "USB_CHG_TYPE_PROPRIETARY";
202 case USB_CHG_TYPE_C:
203 return "USB_CHG_TYPE_C";
204 case USB_CHG_TYPE_BC12_DCP:
205 return "USB_CHG_TYPE_BC12_DCP";
206 case USB_CHG_TYPE_BC12_CDP:
207 return "USB_CHG_TYPE_BC12_CDP";
208 case USB_CHG_TYPE_BC12_SDP:
209 return "USB_CHG_TYPE_BC12_SDP";
210 case USB_CHG_TYPE_OTHER:
211 return "USB_CHG_TYPE_OTHER";
212 case USB_CHG_TYPE_VBUS:
213 return "USB_CHG_TYPE_VBUS";
214 case USB_CHG_TYPE_UNKNOWN:
215 return "USB_CHG_TYPE_UNKNOWN";
216 default:
217 return "USB_CHG_TYPE_UNKNOWN";
218 }
219}
220
221static bool cros_ec_usb_power_type_is_wall_wart(unsigned int type,
222 unsigned int role)
223{
224 switch (type) {
225
226
227
228
229
230 case USB_CHG_TYPE_PROPRIETARY:
231 case USB_CHG_TYPE_BC12_DCP:
232 return true;
233 case USB_CHG_TYPE_PD:
234 case USB_CHG_TYPE_C:
235 case USB_CHG_TYPE_BC12_CDP:
236 case USB_CHG_TYPE_BC12_SDP:
237 case USB_CHG_TYPE_OTHER:
238 case USB_CHG_TYPE_VBUS:
239 case USB_CHG_TYPE_UNKNOWN:
240 case USB_CHG_TYPE_NONE:
241 default:
242 return false;
243 }
244}
245
246static int extcon_cros_ec_detect_cable(struct cros_ec_extcon_info *info,
247 bool force)
248{
249 struct device *dev = info->dev;
250 int role, power_type;
251 unsigned int dr = DR_NONE;
252 bool pr = false;
253 bool polarity = false;
254 bool dp = false;
255 bool mux = false;
256 bool hpd = false;
257
258 power_type = cros_ec_usb_get_power_type(info);
259 if (power_type < 0) {
260 dev_err(dev, "failed getting power type err = %d\n",
261 power_type);
262 return power_type;
263 }
264
265 role = cros_ec_usb_get_role(info, &polarity);
266 if (role < 0) {
267 if (role != -ENOTCONN) {
268 dev_err(dev, "failed getting role err = %d\n", role);
269 return role;
270 }
271 dev_dbg(dev, "disconnected\n");
272 } else {
273 int pd_mux_state;
274
275 dr = (role & PD_CTRL_RESP_ROLE_DATA) ? DR_HOST : DR_DEVICE;
276 pr = (role & PD_CTRL_RESP_ROLE_POWER);
277 pd_mux_state = cros_ec_usb_get_pd_mux_state(info);
278 if (pd_mux_state < 0)
279 pd_mux_state = USB_PD_MUX_USB_ENABLED;
280
281 dp = pd_mux_state & USB_PD_MUX_DP_ENABLED;
282 mux = pd_mux_state & USB_PD_MUX_USB_ENABLED;
283 hpd = pd_mux_state & USB_PD_MUX_HPD_IRQ;
284
285 dev_dbg(dev,
286 "connected role 0x%x pwr type %d dr %d pr %d pol %d mux %d dp %d hpd %d\n",
287 role, power_type, dr, pr, polarity, mux, dp, hpd);
288 }
289
290
291
292
293
294 if (dr == DR_DEVICE &&
295 cros_ec_usb_power_type_is_wall_wart(power_type, role))
296 dr = DR_NONE;
297
298 if (force || info->dr != dr || info->pr != pr || info->dp != dp ||
299 info->mux != mux || info->power_type != power_type) {
300 bool host_connected = false, device_connected = false;
301
302 dev_dbg(dev, "Type/Role switch! type = %s role = %s\n",
303 cros_ec_usb_power_type_string(power_type),
304 cros_ec_usb_role_string(dr));
305 info->dr = dr;
306 info->pr = pr;
307 info->dp = dp;
308 info->mux = mux;
309 info->power_type = power_type;
310
311 if (dr == DR_DEVICE)
312 device_connected = true;
313 else if (dr == DR_HOST)
314 host_connected = true;
315
316 extcon_set_state(info->edev, EXTCON_USB, device_connected);
317 extcon_set_state(info->edev, EXTCON_USB_HOST, host_connected);
318 extcon_set_state(info->edev, EXTCON_DISP_DP, dp);
319 extcon_set_property(info->edev, EXTCON_USB,
320 EXTCON_PROP_USB_VBUS,
321 (union extcon_property_value)(int)pr);
322 extcon_set_property(info->edev, EXTCON_USB_HOST,
323 EXTCON_PROP_USB_VBUS,
324 (union extcon_property_value)(int)pr);
325 extcon_set_property(info->edev, EXTCON_USB,
326 EXTCON_PROP_USB_TYPEC_POLARITY,
327 (union extcon_property_value)(int)polarity);
328 extcon_set_property(info->edev, EXTCON_USB_HOST,
329 EXTCON_PROP_USB_TYPEC_POLARITY,
330 (union extcon_property_value)(int)polarity);
331 extcon_set_property(info->edev, EXTCON_DISP_DP,
332 EXTCON_PROP_USB_TYPEC_POLARITY,
333 (union extcon_property_value)(int)polarity);
334 extcon_set_property(info->edev, EXTCON_USB,
335 EXTCON_PROP_USB_SS,
336 (union extcon_property_value)(int)mux);
337 extcon_set_property(info->edev, EXTCON_USB_HOST,
338 EXTCON_PROP_USB_SS,
339 (union extcon_property_value)(int)mux);
340 extcon_set_property(info->edev, EXTCON_DISP_DP,
341 EXTCON_PROP_USB_SS,
342 (union extcon_property_value)(int)mux);
343 extcon_set_property(info->edev, EXTCON_DISP_DP,
344 EXTCON_PROP_DISP_HPD,
345 (union extcon_property_value)(int)hpd);
346
347 extcon_sync(info->edev, EXTCON_USB);
348 extcon_sync(info->edev, EXTCON_USB_HOST);
349 extcon_sync(info->edev, EXTCON_DISP_DP);
350
351 } else if (hpd) {
352 extcon_set_property(info->edev, EXTCON_DISP_DP,
353 EXTCON_PROP_DISP_HPD,
354 (union extcon_property_value)(int)hpd);
355 extcon_sync(info->edev, EXTCON_DISP_DP);
356 }
357
358 return 0;
359}
360
361static int extcon_cros_ec_event(struct notifier_block *nb,
362 unsigned long queued_during_suspend,
363 void *_notify)
364{
365 struct cros_ec_extcon_info *info;
366 struct cros_ec_device *ec;
367 u32 host_event;
368
369 info = container_of(nb, struct cros_ec_extcon_info, notifier);
370 ec = info->ec;
371
372 host_event = cros_ec_get_host_event(ec);
373 if (host_event & (EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU) |
374 EC_HOST_EVENT_MASK(EC_HOST_EVENT_USB_MUX))) {
375 extcon_cros_ec_detect_cable(info, false);
376 return NOTIFY_OK;
377 }
378
379 return NOTIFY_DONE;
380}
381
382static int extcon_cros_ec_probe(struct platform_device *pdev)
383{
384 struct cros_ec_extcon_info *info;
385 struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
386 struct device *dev = &pdev->dev;
387 struct device_node *np = dev->of_node;
388 int numports, ret;
389
390 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
391 if (!info)
392 return -ENOMEM;
393
394 info->dev = dev;
395 info->ec = ec;
396
397 if (np) {
398 u32 port;
399
400 ret = of_property_read_u32(np, "google,usb-port-id", &port);
401 if (ret < 0) {
402 dev_err(dev, "Missing google,usb-port-id property\n");
403 return ret;
404 }
405 info->port_id = port;
406 } else {
407 info->port_id = pdev->id;
408 }
409
410 numports = cros_ec_pd_get_num_ports(info);
411 if (numports < 0) {
412 dev_err(dev, "failed getting number of ports! ret = %d\n",
413 numports);
414 return numports;
415 }
416
417 if (info->port_id >= numports) {
418 dev_err(dev, "This system only supports %d ports\n", numports);
419 return -ENODEV;
420 }
421
422 info->edev = devm_extcon_dev_allocate(dev, usb_type_c_cable);
423 if (IS_ERR(info->edev)) {
424 dev_err(dev, "failed to allocate extcon device\n");
425 return -ENOMEM;
426 }
427
428 ret = devm_extcon_dev_register(dev, info->edev);
429 if (ret < 0) {
430 dev_err(dev, "failed to register extcon device\n");
431 return ret;
432 }
433
434 extcon_set_property_capability(info->edev, EXTCON_USB,
435 EXTCON_PROP_USB_VBUS);
436 extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
437 EXTCON_PROP_USB_VBUS);
438 extcon_set_property_capability(info->edev, EXTCON_USB,
439 EXTCON_PROP_USB_TYPEC_POLARITY);
440 extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
441 EXTCON_PROP_USB_TYPEC_POLARITY);
442 extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
443 EXTCON_PROP_USB_TYPEC_POLARITY);
444 extcon_set_property_capability(info->edev, EXTCON_USB,
445 EXTCON_PROP_USB_SS);
446 extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
447 EXTCON_PROP_USB_SS);
448 extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
449 EXTCON_PROP_USB_SS);
450 extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
451 EXTCON_PROP_DISP_HPD);
452
453 info->dr = DR_NONE;
454 info->pr = false;
455
456 platform_set_drvdata(pdev, info);
457
458
459 info->notifier.notifier_call = extcon_cros_ec_event;
460 ret = blocking_notifier_chain_register(&info->ec->event_notifier,
461 &info->notifier);
462 if (ret < 0) {
463 dev_err(dev, "failed to register notifier\n");
464 return ret;
465 }
466
467
468 ret = extcon_cros_ec_detect_cable(info, true);
469 if (ret < 0) {
470 dev_err(dev, "failed to detect initial cable state\n");
471 goto unregister_notifier;
472 }
473
474 return 0;
475
476unregister_notifier:
477 blocking_notifier_chain_unregister(&info->ec->event_notifier,
478 &info->notifier);
479 return ret;
480}
481
482static int extcon_cros_ec_remove(struct platform_device *pdev)
483{
484 struct cros_ec_extcon_info *info = platform_get_drvdata(pdev);
485
486 blocking_notifier_chain_unregister(&info->ec->event_notifier,
487 &info->notifier);
488
489 return 0;
490}
491
492#ifdef CONFIG_PM_SLEEP
493static int extcon_cros_ec_suspend(struct device *dev)
494{
495 return 0;
496}
497
498static int extcon_cros_ec_resume(struct device *dev)
499{
500 int ret;
501 struct cros_ec_extcon_info *info = dev_get_drvdata(dev);
502
503 ret = extcon_cros_ec_detect_cable(info, true);
504 if (ret < 0)
505 dev_err(dev, "failed to detect cable state on resume\n");
506
507 return 0;
508}
509
510static const struct dev_pm_ops extcon_cros_ec_dev_pm_ops = {
511 SET_SYSTEM_SLEEP_PM_OPS(extcon_cros_ec_suspend, extcon_cros_ec_resume)
512};
513
514#define DEV_PM_OPS (&extcon_cros_ec_dev_pm_ops)
515#else
516#define DEV_PM_OPS NULL
517#endif
518
519#ifdef CONFIG_OF
520static const struct of_device_id extcon_cros_ec_of_match[] = {
521 { .compatible = "google,extcon-usbc-cros-ec" },
522 { }
523};
524MODULE_DEVICE_TABLE(of, extcon_cros_ec_of_match);
525#endif
526
527static struct platform_driver extcon_cros_ec_driver = {
528 .driver = {
529 .name = "extcon-usbc-cros-ec",
530 .of_match_table = of_match_ptr(extcon_cros_ec_of_match),
531 .pm = DEV_PM_OPS,
532 },
533 .remove = extcon_cros_ec_remove,
534 .probe = extcon_cros_ec_probe,
535};
536
537module_platform_driver(extcon_cros_ec_driver);
538
539MODULE_DESCRIPTION("ChromeOS Embedded Controller extcon driver");
540MODULE_AUTHOR("Benson Leung <bleung@chromium.org>");
541MODULE_LICENSE("GPL v2");
542
