1 /*
2 * SVC Greybus driver.
3 *
4 * Copyright 2015 Google Inc.
5 * Copyright 2015 Linaro Ltd.
6 *
7 * Released under the GPLv2 only.
8 */
9
10 #include <linux/debugfs.h>
11 #include <linux/workqueue.h>
12
13 #include "greybus.h"
14
15 #define SVC_INTF_EJECT_TIMEOUT 9000
16 #define SVC_INTF_ACTIVATE_TIMEOUT 6000
17 #define SVC_INTF_RESUME_TIMEOUT 3000
18
19 struct gb_svc_deferred_request {
20 struct work_struct work;
21 struct gb_operation *operation;
22 };
23
24
25 static int gb_svc_queue_deferred_request(struct gb_operation *operation);
26
endo_id_show(struct device * dev,struct device_attribute * attr,char * buf)27 static ssize_t endo_id_show(struct device *dev,
28 struct device_attribute *attr, char *buf)
29 {
30 struct gb_svc *svc = to_gb_svc(dev);
31
32 return sprintf(buf, "0x%04x\n", svc->endo_id);
33 }
34 static DEVICE_ATTR_RO(endo_id);
35
ap_intf_id_show(struct device * dev,struct device_attribute * attr,char * buf)36 static ssize_t ap_intf_id_show(struct device *dev,
37 struct device_attribute *attr, char *buf)
38 {
39 struct gb_svc *svc = to_gb_svc(dev);
40
41 return sprintf(buf, "%u\n", svc->ap_intf_id);
42 }
43 static DEVICE_ATTR_RO(ap_intf_id);
44
45 // FIXME
46 // This is a hack, we need to do this "right" and clean the interface up
47 // properly, not just forcibly yank the thing out of the system and hope for the
48 // best. But for now, people want their modules to come out without having to
49 // throw the thing to the ground or get out a screwdriver.
intf_eject_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)50 static ssize_t intf_eject_store(struct device *dev,
51 struct device_attribute *attr, const char *buf,
52 size_t len)
53 {
54 struct gb_svc *svc = to_gb_svc(dev);
55 unsigned short intf_id;
56 int ret;
57
58 ret = kstrtou16(buf, 10, &intf_id);
59 if (ret < 0)
60 return ret;
61
62 dev_warn(dev, "Forcibly trying to eject interface %d\n", intf_id);
63
64 ret = gb_svc_intf_eject(svc, intf_id);
65 if (ret < 0)
66 return ret;
67
68 return len;
69 }
70 static DEVICE_ATTR_WO(intf_eject);
71
watchdog_show(struct device * dev,struct device_attribute * attr,char * buf)72 static ssize_t watchdog_show(struct device *dev, struct device_attribute *attr,
73 char *buf)
74 {
75 struct gb_svc *svc = to_gb_svc(dev);
76
77 return sprintf(buf, "%s\n",
78 gb_svc_watchdog_enabled(svc) ? "enabled" : "disabled");
79 }
80
watchdog_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)81 static ssize_t watchdog_store(struct device *dev,
82 struct device_attribute *attr, const char *buf,
83 size_t len)
84 {
85 struct gb_svc *svc = to_gb_svc(dev);
86 int retval;
87 bool user_request;
88
89 retval = strtobool(buf, &user_request);
90 if (retval)
91 return retval;
92
93 if (user_request)
94 retval = gb_svc_watchdog_enable(svc);
95 else
96 retval = gb_svc_watchdog_disable(svc);
97 if (retval)
98 return retval;
99 return len;
100 }
101 static DEVICE_ATTR_RW(watchdog);
102
watchdog_action_show(struct device * dev,struct device_attribute * attr,char * buf)103 static ssize_t watchdog_action_show(struct device *dev,
104 struct device_attribute *attr, char *buf)
105 {
106 struct gb_svc *svc = to_gb_svc(dev);
107
108 if (svc->action == GB_SVC_WATCHDOG_BITE_PANIC_KERNEL)
109 return sprintf(buf, "panic\n");
110 else if (svc->action == GB_SVC_WATCHDOG_BITE_RESET_UNIPRO)
111 return sprintf(buf, "reset\n");
112
113 return -EINVAL;
114 }
115
watchdog_action_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)116 static ssize_t watchdog_action_store(struct device *dev,
117 struct device_attribute *attr,
118 const char *buf, size_t len)
119 {
120 struct gb_svc *svc = to_gb_svc(dev);
121
122 if (sysfs_streq(buf, "panic"))
123 svc->action = GB_SVC_WATCHDOG_BITE_PANIC_KERNEL;
124 else if (sysfs_streq(buf, "reset"))
125 svc->action = GB_SVC_WATCHDOG_BITE_RESET_UNIPRO;
126 else
127 return -EINVAL;
128
129 return len;
130 }
131 static DEVICE_ATTR_RW(watchdog_action);
132
gb_svc_pwrmon_rail_count_get(struct gb_svc * svc,u8 * value)133 static int gb_svc_pwrmon_rail_count_get(struct gb_svc *svc, u8 *value)
134 {
135 struct gb_svc_pwrmon_rail_count_get_response response;
136 int ret;
137
138 ret = gb_operation_sync(svc->connection,
139 GB_SVC_TYPE_PWRMON_RAIL_COUNT_GET, NULL, 0,
140 &response, sizeof(response));
141 if (ret) {
142 dev_err(&svc->dev, "failed to get rail count: %d\n", ret);
143 return ret;
144 }
145
146 *value = response.rail_count;
147
148 return 0;
149 }
150
gb_svc_pwrmon_rail_names_get(struct gb_svc * svc,struct gb_svc_pwrmon_rail_names_get_response * response,size_t bufsize)151 static int gb_svc_pwrmon_rail_names_get(struct gb_svc *svc,
152 struct gb_svc_pwrmon_rail_names_get_response *response,
153 size_t bufsize)
154 {
155 int ret;
156
157 ret = gb_operation_sync(svc->connection,
158 GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET, NULL, 0,
159 response, bufsize);
160 if (ret) {
161 dev_err(&svc->dev, "failed to get rail names: %d\n", ret);
162 return ret;
163 }
164
165 if (response->status != GB_SVC_OP_SUCCESS) {
166 dev_err(&svc->dev,
167 "SVC error while getting rail names: %u\n",
168 response->status);
169 return -EREMOTEIO;
170 }
171
172 return 0;
173 }
174
gb_svc_pwrmon_sample_get(struct gb_svc * svc,u8 rail_id,u8 measurement_type,u32 * value)175 static int gb_svc_pwrmon_sample_get(struct gb_svc *svc, u8 rail_id,
176 u8 measurement_type, u32 *value)
177 {
178 struct gb_svc_pwrmon_sample_get_request request;
179 struct gb_svc_pwrmon_sample_get_response response;
180 int ret;
181
182 request.rail_id = rail_id;
183 request.measurement_type = measurement_type;
184
185 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_PWRMON_SAMPLE_GET,
186 &request, sizeof(request),
187 &response, sizeof(response));
188 if (ret) {
189 dev_err(&svc->dev, "failed to get rail sample: %d\n", ret);
190 return ret;
191 }
192
193 if (response.result) {
194 dev_err(&svc->dev,
195 "UniPro error while getting rail power sample (%d %d): %d\n",
196 rail_id, measurement_type, response.result);
197 switch (response.result) {
198 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
199 return -EINVAL;
200 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
201 return -ENOMSG;
202 default:
203 return -EREMOTEIO;
204 }
205 }
206
207 *value = le32_to_cpu(response.measurement);
208
209 return 0;
210 }
211
gb_svc_pwrmon_intf_sample_get(struct gb_svc * svc,u8 intf_id,u8 measurement_type,u32 * value)212 int gb_svc_pwrmon_intf_sample_get(struct gb_svc *svc, u8 intf_id,
213 u8 measurement_type, u32 *value)
214 {
215 struct gb_svc_pwrmon_intf_sample_get_request request;
216 struct gb_svc_pwrmon_intf_sample_get_response response;
217 int ret;
218
219 request.intf_id = intf_id;
220 request.measurement_type = measurement_type;
221
222 ret = gb_operation_sync(svc->connection,
223 GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET,
224 &request, sizeof(request),
225 &response, sizeof(response));
226 if (ret) {
227 dev_err(&svc->dev, "failed to get intf sample: %d\n", ret);
228 return ret;
229 }
230
231 if (response.result) {
232 dev_err(&svc->dev,
233 "UniPro error while getting intf power sample (%d %d): %d\n",
234 intf_id, measurement_type, response.result);
235 switch (response.result) {
236 case GB_SVC_PWRMON_GET_SAMPLE_INVAL:
237 return -EINVAL;
238 case GB_SVC_PWRMON_GET_SAMPLE_NOSUPP:
239 return -ENOMSG;
240 default:
241 return -EREMOTEIO;
242 }
243 }
244
245 *value = le32_to_cpu(response.measurement);
246
247 return 0;
248 }
249
250 static struct attribute *svc_attrs[] = {
251 &dev_attr_endo_id.attr,
252 &dev_attr_ap_intf_id.attr,
253 &dev_attr_intf_eject.attr,
254 &dev_attr_watchdog.attr,
255 &dev_attr_watchdog_action.attr,
256 NULL,
257 };
258 ATTRIBUTE_GROUPS(svc);
259
gb_svc_intf_device_id(struct gb_svc * svc,u8 intf_id,u8 device_id)260 int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id)
261 {
262 struct gb_svc_intf_device_id_request request;
263
264 request.intf_id = intf_id;
265 request.device_id = device_id;
266
267 return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID,
268 &request, sizeof(request), NULL, 0);
269 }
270
gb_svc_intf_eject(struct gb_svc * svc,u8 intf_id)271 int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id)
272 {
273 struct gb_svc_intf_eject_request request;
274 int ret;
275
276 request.intf_id = intf_id;
277
278 /*
279 * The pulse width for module release in svc is long so we need to
280 * increase the timeout so the operation will not return to soon.
281 */
282 ret = gb_operation_sync_timeout(svc->connection,
283 GB_SVC_TYPE_INTF_EJECT, &request,
284 sizeof(request), NULL, 0,
285 SVC_INTF_EJECT_TIMEOUT);
286 if (ret) {
287 dev_err(&svc->dev, "failed to eject interface %u\n", intf_id);
288 return ret;
289 }
290
291 return 0;
292 }
293
gb_svc_intf_vsys_set(struct gb_svc * svc,u8 intf_id,bool enable)294 int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable)
295 {
296 struct gb_svc_intf_vsys_request request;
297 struct gb_svc_intf_vsys_response response;
298 int type, ret;
299
300 request.intf_id = intf_id;
301
302 if (enable)
303 type = GB_SVC_TYPE_INTF_VSYS_ENABLE;
304 else
305 type = GB_SVC_TYPE_INTF_VSYS_DISABLE;
306
307 ret = gb_operation_sync(svc->connection, type,
308 &request, sizeof(request),
309 &response, sizeof(response));
310 if (ret < 0)
311 return ret;
312 if (response.result_code != GB_SVC_INTF_VSYS_OK)
313 return -EREMOTEIO;
314 return 0;
315 }
316
gb_svc_intf_refclk_set(struct gb_svc * svc,u8 intf_id,bool enable)317 int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable)
318 {
319 struct gb_svc_intf_refclk_request request;
320 struct gb_svc_intf_refclk_response response;
321 int type, ret;
322
323 request.intf_id = intf_id;
324
325 if (enable)
326 type = GB_SVC_TYPE_INTF_REFCLK_ENABLE;
327 else
328 type = GB_SVC_TYPE_INTF_REFCLK_DISABLE;
329
330 ret = gb_operation_sync(svc->connection, type,
331 &request, sizeof(request),
332 &response, sizeof(response));
333 if (ret < 0)
334 return ret;
335 if (response.result_code != GB_SVC_INTF_REFCLK_OK)
336 return -EREMOTEIO;
337 return 0;
338 }
339
gb_svc_intf_unipro_set(struct gb_svc * svc,u8 intf_id,bool enable)340 int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
341 {
342 struct gb_svc_intf_unipro_request request;
343 struct gb_svc_intf_unipro_response response;
344 int type, ret;
345
346 request.intf_id = intf_id;
347
348 if (enable)
349 type = GB_SVC_TYPE_INTF_UNIPRO_ENABLE;
350 else
351 type = GB_SVC_TYPE_INTF_UNIPRO_DISABLE;
352
353 ret = gb_operation_sync(svc->connection, type,
354 &request, sizeof(request),
355 &response, sizeof(response));
356 if (ret < 0)
357 return ret;
358 if (response.result_code != GB_SVC_INTF_UNIPRO_OK)
359 return -EREMOTEIO;
360 return 0;
361 }
362
gb_svc_intf_activate(struct gb_svc * svc,u8 intf_id,u8 * intf_type)363 int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
364 {
365 struct gb_svc_intf_activate_request request;
366 struct gb_svc_intf_activate_response response;
367 int ret;
368
369 request.intf_id = intf_id;
370
371 ret = gb_operation_sync_timeout(svc->connection,
372 GB_SVC_TYPE_INTF_ACTIVATE,
373 &request, sizeof(request),
374 &response, sizeof(response),
375 SVC_INTF_ACTIVATE_TIMEOUT);
376 if (ret < 0)
377 return ret;
378 if (response.status != GB_SVC_OP_SUCCESS) {
379 dev_err(&svc->dev, "failed to activate interface %u: %u\n",
380 intf_id, response.status);
381 return -EREMOTEIO;
382 }
383
384 *intf_type = response.intf_type;
385
386 return 0;
387 }
388
gb_svc_intf_resume(struct gb_svc * svc,u8 intf_id)389 int gb_svc_intf_resume(struct gb_svc *svc, u8 intf_id)
390 {
391 struct gb_svc_intf_resume_request request;
392 struct gb_svc_intf_resume_response response;
393 int ret;
394
395 request.intf_id = intf_id;
396
397 ret = gb_operation_sync_timeout(svc->connection,
398 GB_SVC_TYPE_INTF_RESUME,
399 &request, sizeof(request),
400 &response, sizeof(response),
401 SVC_INTF_RESUME_TIMEOUT);
402 if (ret < 0) {
403 dev_err(&svc->dev, "failed to send interface resume %u: %d\n",
404 intf_id, ret);
405 return ret;
406 }
407
408 if (response.status != GB_SVC_OP_SUCCESS) {
409 dev_err(&svc->dev, "failed to resume interface %u: %u\n",
410 intf_id, response.status);
411 return -EREMOTEIO;
412 }
413
414 return 0;
415 }
416
gb_svc_dme_peer_get(struct gb_svc * svc,u8 intf_id,u16 attr,u16 selector,u32 * value)417 int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
418 u32 *value)
419 {
420 struct gb_svc_dme_peer_get_request request;
421 struct gb_svc_dme_peer_get_response response;
422 u16 result;
423 int ret;
424
425 request.intf_id = intf_id;
426 request.attr = cpu_to_le16(attr);
427 request.selector = cpu_to_le16(selector);
428
429 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET,
430 &request, sizeof(request),
431 &response, sizeof(response));
432 if (ret) {
433 dev_err(&svc->dev, "failed to get DME attribute (%u 0x%04x %u): %d\n",
434 intf_id, attr, selector, ret);
435 return ret;
436 }
437
438 result = le16_to_cpu(response.result_code);
439 if (result) {
440 dev_err(&svc->dev, "UniPro error while getting DME attribute (%u 0x%04x %u): %u\n",
441 intf_id, attr, selector, result);
442 return -EREMOTEIO;
443 }
444
445 if (value)
446 *value = le32_to_cpu(response.attr_value);
447
448 return 0;
449 }
450
gb_svc_dme_peer_set(struct gb_svc * svc,u8 intf_id,u16 attr,u16 selector,u32 value)451 int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
452 u32 value)
453 {
454 struct gb_svc_dme_peer_set_request request;
455 struct gb_svc_dme_peer_set_response response;
456 u16 result;
457 int ret;
458
459 request.intf_id = intf_id;
460 request.attr = cpu_to_le16(attr);
461 request.selector = cpu_to_le16(selector);
462 request.value = cpu_to_le32(value);
463
464 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET,
465 &request, sizeof(request),
466 &response, sizeof(response));
467 if (ret) {
468 dev_err(&svc->dev, "failed to set DME attribute (%u 0x%04x %u %u): %d\n",
469 intf_id, attr, selector, value, ret);
470 return ret;
471 }
472
473 result = le16_to_cpu(response.result_code);
474 if (result) {
475 dev_err(&svc->dev, "UniPro error while setting DME attribute (%u 0x%04x %u %u): %u\n",
476 intf_id, attr, selector, value, result);
477 return -EREMOTEIO;
478 }
479
480 return 0;
481 }
482
gb_svc_connection_create(struct gb_svc * svc,u8 intf1_id,u16 cport1_id,u8 intf2_id,u16 cport2_id,u8 cport_flags)483 int gb_svc_connection_create(struct gb_svc *svc,
484 u8 intf1_id, u16 cport1_id,
485 u8 intf2_id, u16 cport2_id,
486 u8 cport_flags)
487 {
488 struct gb_svc_conn_create_request request;
489
490 request.intf1_id = intf1_id;
491 request.cport1_id = cpu_to_le16(cport1_id);
492 request.intf2_id = intf2_id;
493 request.cport2_id = cpu_to_le16(cport2_id);
494 request.tc = 0; /* TC0 */
495 request.flags = cport_flags;
496
497 return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE,
498 &request, sizeof(request), NULL, 0);
499 }
500
gb_svc_connection_destroy(struct gb_svc * svc,u8 intf1_id,u16 cport1_id,u8 intf2_id,u16 cport2_id)501 void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id,
502 u8 intf2_id, u16 cport2_id)
503 {
504 struct gb_svc_conn_destroy_request request;
505 struct gb_connection *connection = svc->connection;
506 int ret;
507
508 request.intf1_id = intf1_id;
509 request.cport1_id = cpu_to_le16(cport1_id);
510 request.intf2_id = intf2_id;
511 request.cport2_id = cpu_to_le16(cport2_id);
512
513 ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY,
514 &request, sizeof(request), NULL, 0);
515 if (ret) {
516 dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n",
517 intf1_id, cport1_id, intf2_id, cport2_id, ret);
518 }
519 }
520
521 /* Creates bi-directional routes between the devices */
gb_svc_route_create(struct gb_svc * svc,u8 intf1_id,u8 dev1_id,u8 intf2_id,u8 dev2_id)522 int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id,
523 u8 intf2_id, u8 dev2_id)
524 {
525 struct gb_svc_route_create_request request;
526
527 request.intf1_id = intf1_id;
528 request.dev1_id = dev1_id;
529 request.intf2_id = intf2_id;
530 request.dev2_id = dev2_id;
531
532 return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE,
533 &request, sizeof(request), NULL, 0);
534 }
535
536 /* Destroys bi-directional routes between the devices */
gb_svc_route_destroy(struct gb_svc * svc,u8 intf1_id,u8 intf2_id)537 void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id)
538 {
539 struct gb_svc_route_destroy_request request;
540 int ret;
541
542 request.intf1_id = intf1_id;
543 request.intf2_id = intf2_id;
544
545 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY,
546 &request, sizeof(request), NULL, 0);
547 if (ret) {
548 dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n",
549 intf1_id, intf2_id, ret);
550 }
551 }
552
gb_svc_intf_set_power_mode(struct gb_svc * svc,u8 intf_id,u8 hs_series,u8 tx_mode,u8 tx_gear,u8 tx_nlanes,u8 tx_amplitude,u8 tx_hs_equalizer,u8 rx_mode,u8 rx_gear,u8 rx_nlanes,u8 flags,u32 quirks,struct gb_svc_l2_timer_cfg * local,struct gb_svc_l2_timer_cfg * remote)553 int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
554 u8 tx_mode, u8 tx_gear, u8 tx_nlanes,
555 u8 tx_amplitude, u8 tx_hs_equalizer,
556 u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
557 u8 flags, u32 quirks,
558 struct gb_svc_l2_timer_cfg *local,
559 struct gb_svc_l2_timer_cfg *remote)
560 {
561 struct gb_svc_intf_set_pwrm_request request;
562 struct gb_svc_intf_set_pwrm_response response;
563 int ret;
564 u16 result_code;
565
566 memset(&request, 0, sizeof(request));
567
568 request.intf_id = intf_id;
569 request.hs_series = hs_series;
570 request.tx_mode = tx_mode;
571 request.tx_gear = tx_gear;
572 request.tx_nlanes = tx_nlanes;
573 request.tx_amplitude = tx_amplitude;
574 request.tx_hs_equalizer = tx_hs_equalizer;
575 request.rx_mode = rx_mode;
576 request.rx_gear = rx_gear;
577 request.rx_nlanes = rx_nlanes;
578 request.flags = flags;
579 request.quirks = cpu_to_le32(quirks);
580 if (local)
581 request.local_l2timerdata = *local;
582 if (remote)
583 request.remote_l2timerdata = *remote;
584
585 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
586 &request, sizeof(request),
587 &response, sizeof(response));
588 if (ret < 0)
589 return ret;
590
591 result_code = response.result_code;
592 if (result_code != GB_SVC_SETPWRM_PWR_LOCAL) {
593 dev_err(&svc->dev, "set power mode = %d\n", result_code);
594 return -EIO;
595 }
596
597 return 0;
598 }
599 EXPORT_SYMBOL_GPL(gb_svc_intf_set_power_mode);
600
gb_svc_intf_set_power_mode_hibernate(struct gb_svc * svc,u8 intf_id)601 int gb_svc_intf_set_power_mode_hibernate(struct gb_svc *svc, u8 intf_id)
602 {
603 struct gb_svc_intf_set_pwrm_request request;
604 struct gb_svc_intf_set_pwrm_response response;
605 int ret;
606 u16 result_code;
607
608 memset(&request, 0, sizeof(request));
609
610 request.intf_id = intf_id;
611 request.hs_series = GB_SVC_UNIPRO_HS_SERIES_A;
612 request.tx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
613 request.rx_mode = GB_SVC_UNIPRO_HIBERNATE_MODE;
614
615 ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_SET_PWRM,
616 &request, sizeof(request),
617 &response, sizeof(response));
618 if (ret < 0) {
619 dev_err(&svc->dev,
620 "failed to send set power mode operation to interface %u: %d\n",
621 intf_id, ret);
622 return ret;
623 }
624
625 result_code = response.result_code;
626 if (result_code != GB_SVC_SETPWRM_PWR_OK) {
627 dev_err(&svc->dev,
628 "failed to hibernate the link for interface %u: %u\n",
629 intf_id, result_code);
630 return -EIO;
631 }
632
633 return 0;
634 }
635
gb_svc_ping(struct gb_svc * svc)636 int gb_svc_ping(struct gb_svc *svc)
637 {
638 return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PING,
639 NULL, 0, NULL, 0,
640 GB_OPERATION_TIMEOUT_DEFAULT * 2);
641 }
642
gb_svc_version_request(struct gb_operation * op)643 static int gb_svc_version_request(struct gb_operation *op)
644 {
645 struct gb_connection *connection = op->connection;
646 struct gb_svc *svc = gb_connection_get_data(connection);
647 struct gb_svc_version_request *request;
648 struct gb_svc_version_response *response;
649
650 if (op->request->payload_size < sizeof(*request)) {
651 dev_err(&svc->dev, "short version request (%zu < %zu)\n",
652 op->request->payload_size,
653 sizeof(*request));
654 return -EINVAL;
655 }
656
657 request = op->request->payload;
658
659 if (request->major > GB_SVC_VERSION_MAJOR) {
660 dev_warn(&svc->dev, "unsupported major version (%u > %u)\n",
661 request->major, GB_SVC_VERSION_MAJOR);
662 return -ENOTSUPP;
663 }
664
665 svc->protocol_major = request->major;
666 svc->protocol_minor = request->minor;
667
668 if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL))
669 return -ENOMEM;
670
671 response = op->response->payload;
672 response->major = svc->protocol_major;
673 response->minor = svc->protocol_minor;
674
675 return 0;
676 }
677
pwr_debugfs_voltage_read(struct file * file,char __user * buf,size_t len,loff_t * offset)678 static ssize_t pwr_debugfs_voltage_read(struct file *file, char __user *buf,
679 size_t len, loff_t *offset)
680 {
681 struct svc_debugfs_pwrmon_rail *pwrmon_rails =
682 file_inode(file)->i_private;
683 struct gb_svc *svc = pwrmon_rails->svc;
684 int ret, desc;
685 u32 value;
686 char buff[16];
687
688 ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
689 GB_SVC_PWRMON_TYPE_VOL, &value);
690 if (ret) {
691 dev_err(&svc->dev,
692 "failed to get voltage sample %u: %d\n",
693 pwrmon_rails->id, ret);
694 return ret;
695 }
696
697 desc = scnprintf(buff, sizeof(buff), "%u\n", value);
698
699 return simple_read_from_buffer(buf, len, offset, buff, desc);
700 }
701
pwr_debugfs_current_read(struct file * file,char __user * buf,size_t len,loff_t * offset)702 static ssize_t pwr_debugfs_current_read(struct file *file, char __user *buf,
703 size_t len, loff_t *offset)
704 {
705 struct svc_debugfs_pwrmon_rail *pwrmon_rails =
706 file_inode(file)->i_private;
707 struct gb_svc *svc = pwrmon_rails->svc;
708 int ret, desc;
709 u32 value;
710 char buff[16];
711
712 ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
713 GB_SVC_PWRMON_TYPE_CURR, &value);
714 if (ret) {
715 dev_err(&svc->dev,
716 "failed to get current sample %u: %d\n",
717 pwrmon_rails->id, ret);
718 return ret;
719 }
720
721 desc = scnprintf(buff, sizeof(buff), "%u\n", value);
722
723 return simple_read_from_buffer(buf, len, offset, buff, desc);
724 }
725
pwr_debugfs_power_read(struct file * file,char __user * buf,size_t len,loff_t * offset)726 static ssize_t pwr_debugfs_power_read(struct file *file, char __user *buf,
727 size_t len, loff_t *offset)
728 {
729 struct svc_debugfs_pwrmon_rail *pwrmon_rails =
730 file_inode(file)->i_private;
731 struct gb_svc *svc = pwrmon_rails->svc;
732 int ret, desc;
733 u32 value;
734 char buff[16];
735
736 ret = gb_svc_pwrmon_sample_get(svc, pwrmon_rails->id,
737 GB_SVC_PWRMON_TYPE_PWR, &value);
738 if (ret) {
739 dev_err(&svc->dev, "failed to get power sample %u: %d\n",
740 pwrmon_rails->id, ret);
741 return ret;
742 }
743
744 desc = scnprintf(buff, sizeof(buff), "%u\n", value);
745
746 return simple_read_from_buffer(buf, len, offset, buff, desc);
747 }
748
749 static const struct file_operations pwrmon_debugfs_voltage_fops = {
750 .read = pwr_debugfs_voltage_read,
751 };
752
753 static const struct file_operations pwrmon_debugfs_current_fops = {
754 .read = pwr_debugfs_current_read,
755 };
756
757 static const struct file_operations pwrmon_debugfs_power_fops = {
758 .read = pwr_debugfs_power_read,
759 };
760
gb_svc_pwrmon_debugfs_init(struct gb_svc * svc)761 static void gb_svc_pwrmon_debugfs_init(struct gb_svc *svc)
762 {
763 int i;
764 size_t bufsize;
765 struct dentry *dent;
766 struct gb_svc_pwrmon_rail_names_get_response *rail_names;
767 u8 rail_count;
768
769 dent = debugfs_create_dir("pwrmon", svc->debugfs_dentry);
770 if (IS_ERR_OR_NULL(dent))
771 return;
772
773 if (gb_svc_pwrmon_rail_count_get(svc, &rail_count))
774 goto err_pwrmon_debugfs;
775
776 if (!rail_count || rail_count > GB_SVC_PWRMON_MAX_RAIL_COUNT)
777 goto err_pwrmon_debugfs;
778
779 bufsize = sizeof(*rail_names) +
780 GB_SVC_PWRMON_RAIL_NAME_BUFSIZE * rail_count;
781
782 rail_names = kzalloc(bufsize, GFP_KERNEL);
783 if (!rail_names)
784 goto err_pwrmon_debugfs;
785
786 svc->pwrmon_rails = kcalloc(rail_count, sizeof(*svc->pwrmon_rails),
787 GFP_KERNEL);
788 if (!svc->pwrmon_rails)
789 goto err_pwrmon_debugfs_free;
790
791 if (gb_svc_pwrmon_rail_names_get(svc, rail_names, bufsize))
792 goto err_pwrmon_debugfs_free;
793
794 for (i = 0; i < rail_count; i++) {
795 struct dentry *dir;
796 struct svc_debugfs_pwrmon_rail *rail = &svc->pwrmon_rails[i];
797 char fname[GB_SVC_PWRMON_RAIL_NAME_BUFSIZE];
798
799 snprintf(fname, sizeof(fname), "%s",
800 (char *)&rail_names->name[i]);
801
802 rail->id = i;
803 rail->svc = svc;
804
805 dir = debugfs_create_dir(fname, dent);
806 debugfs_create_file("voltage_now", 0444, dir, rail,
807 &pwrmon_debugfs_voltage_fops);
808 debugfs_create_file("current_now", 0444, dir, rail,
809 &pwrmon_debugfs_current_fops);
810 debugfs_create_file("power_now", 0444, dir, rail,
811 &pwrmon_debugfs_power_fops);
812 }
813
814 kfree(rail_names);
815 return;
816
817 err_pwrmon_debugfs_free:
818 kfree(rail_names);
819 kfree(svc->pwrmon_rails);
820 svc->pwrmon_rails = NULL;
821
822 err_pwrmon_debugfs:
823 debugfs_remove(dent);
824 }
825
gb_svc_debugfs_init(struct gb_svc * svc)826 static void gb_svc_debugfs_init(struct gb_svc *svc)
827 {
828 svc->debugfs_dentry = debugfs_create_dir(dev_name(&svc->dev),
829 gb_debugfs_get());
830 gb_svc_pwrmon_debugfs_init(svc);
831 }
832
gb_svc_debugfs_exit(struct gb_svc * svc)833 static void gb_svc_debugfs_exit(struct gb_svc *svc)
834 {
835 debugfs_remove_recursive(svc->debugfs_dentry);
836 kfree(svc->pwrmon_rails);
837 svc->pwrmon_rails = NULL;
838 }
839
gb_svc_hello(struct gb_operation * op)840 static int gb_svc_hello(struct gb_operation *op)
841 {
842 struct gb_connection *connection = op->connection;
843 struct gb_svc *svc = gb_connection_get_data(connection);
844 struct gb_svc_hello_request *hello_request;
845 int ret;
846
847 if (op->request->payload_size < sizeof(*hello_request)) {
848 dev_warn(&svc->dev, "short hello request (%zu < %zu)\n",
849 op->request->payload_size,
850 sizeof(*hello_request));
851 return -EINVAL;
852 }
853
854 hello_request = op->request->payload;
855 svc->endo_id = le16_to_cpu(hello_request->endo_id);
856 svc->ap_intf_id = hello_request->interface_id;
857
858 ret = device_add(&svc->dev);
859 if (ret) {
860 dev_err(&svc->dev, "failed to register svc device: %d\n", ret);
861 return ret;
862 }
863
864 ret = gb_svc_watchdog_create(svc);
865 if (ret) {
866 dev_err(&svc->dev, "failed to create watchdog: %d\n", ret);
867 goto err_unregister_device;
868 }
869
870 gb_svc_debugfs_init(svc);
871
872 return gb_svc_queue_deferred_request(op);
873
874 err_unregister_device:
875 gb_svc_watchdog_destroy(svc);
876 device_del(&svc->dev);
877 return ret;
878 }
879
gb_svc_interface_lookup(struct gb_svc * svc,u8 intf_id)880 static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
881 u8 intf_id)
882 {
883 struct gb_host_device *hd = svc->hd;
884 struct gb_module *module;
885 size_t num_interfaces;
886 u8 module_id;
887
888 list_for_each_entry(module, &hd->modules, hd_node) {
889 module_id = module->module_id;
890 num_interfaces = module->num_interfaces;
891
892 if (intf_id >= module_id &&
893 intf_id < module_id + num_interfaces) {
894 return module->interfaces[intf_id - module_id];
895 }
896 }
897
898 return NULL;
899 }
900
gb_svc_module_lookup(struct gb_svc * svc,u8 module_id)901 static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
902 {
903 struct gb_host_device *hd = svc->hd;
904 struct gb_module *module;
905
906 list_for_each_entry(module, &hd->modules, hd_node) {
907 if (module->module_id == module_id)
908 return module;
909 }
910
911 return NULL;
912 }
913
gb_svc_process_hello_deferred(struct gb_operation * operation)914 static void gb_svc_process_hello_deferred(struct gb_operation *operation)
915 {
916 struct gb_connection *connection = operation->connection;
917 struct gb_svc *svc = gb_connection_get_data(connection);
918 int ret;
919
920 /*
921 * XXX This is a hack/work-around to reconfigure the APBridgeA-Switch
922 * link to PWM G2, 1 Lane, Slow Auto, so that it has sufficient
923 * bandwidth for 3 audio streams plus boot-over-UniPro of a hot-plugged
924 * module.
925 *
926 * The code should be removed once SW-2217, Heuristic for UniPro
927 * Power Mode Changes is resolved.
928 */
929 ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
930 GB_SVC_UNIPRO_HS_SERIES_A,
931 GB_SVC_UNIPRO_SLOW_AUTO_MODE,
932 2, 1,
933 GB_SVC_SMALL_AMPLITUDE,
934 GB_SVC_NO_DE_EMPHASIS,
935 GB_SVC_UNIPRO_SLOW_AUTO_MODE,
936 2, 1,
937 0, 0,
938 NULL, NULL);
939
940 if (ret)
941 dev_warn(&svc->dev,
942 "power mode change failed on AP to switch link: %d\n",
943 ret);
944 }
945
gb_svc_process_module_inserted(struct gb_operation * operation)946 static void gb_svc_process_module_inserted(struct gb_operation *operation)
947 {
948 struct gb_svc_module_inserted_request *request;
949 struct gb_connection *connection = operation->connection;
950 struct gb_svc *svc = gb_connection_get_data(connection);
951 struct gb_host_device *hd = svc->hd;
952 struct gb_module *module;
953 size_t num_interfaces;
954 u8 module_id;
955 u16 flags;
956 int ret;
957
958 /* The request message size has already been verified. */
959 request = operation->request->payload;
960 module_id = request->primary_intf_id;
961 num_interfaces = request->intf_count;
962 flags = le16_to_cpu(request->flags);
963
964 dev_dbg(&svc->dev, "%s - id = %u, num_interfaces = %zu, flags = 0x%04x\n",
965 __func__, module_id, num_interfaces, flags);
966
967 if (flags & GB_SVC_MODULE_INSERTED_FLAG_NO_PRIMARY) {
968 dev_warn(&svc->dev, "no primary interface detected on module %u\n",
969 module_id);
970 }
971
972 module = gb_svc_module_lookup(svc, module_id);
973 if (module) {
974 dev_warn(&svc->dev, "unexpected module-inserted event %u\n",
975 module_id);
976 return;
977 }
978
979 module = gb_module_create(hd, module_id, num_interfaces);
980 if (!module) {
981 dev_err(&svc->dev, "failed to create module\n");
982 return;
983 }
984
985 ret = gb_module_add(module);
986 if (ret) {
987 gb_module_put(module);
988 return;
989 }
990
991 list_add(&module->hd_node, &hd->modules);
992 }
993
gb_svc_process_module_removed(struct gb_operation * operation)994 static void gb_svc_process_module_removed(struct gb_operation *operation)
995 {
996 struct gb_svc_module_removed_request *request;
997 struct gb_connection *connection = operation->connection;
998 struct gb_svc *svc = gb_connection_get_data(connection);
999 struct gb_module *module;
1000 u8 module_id;
1001
1002 /* The request message size has already been verified. */
1003 request = operation->request->payload;
1004 module_id = request->primary_intf_id;
1005
1006 dev_dbg(&svc->dev, "%s - id = %u\n", __func__, module_id);
1007
1008 module = gb_svc_module_lookup(svc, module_id);
1009 if (!module) {
1010 dev_warn(&svc->dev, "unexpected module-removed event %u\n",
1011 module_id);
1012 return;
1013 }
1014
1015 module->disconnected = true;
1016
1017 gb_module_del(module);
1018 list_del(&module->hd_node);
1019 gb_module_put(module);
1020 }
1021
gb_svc_process_intf_oops(struct gb_operation * operation)1022 static void gb_svc_process_intf_oops(struct gb_operation *operation)
1023 {
1024 struct gb_svc_intf_oops_request *request;
1025 struct gb_connection *connection = operation->connection;
1026 struct gb_svc *svc = gb_connection_get_data(connection);
1027 struct gb_interface *intf;
1028 u8 intf_id;
1029 u8 reason;
1030
1031 /* The request message size has already been verified. */
1032 request = operation->request->payload;
1033 intf_id = request->intf_id;
1034 reason = request->reason;
1035
1036 intf = gb_svc_interface_lookup(svc, intf_id);
1037 if (!intf) {
1038 dev_warn(&svc->dev, "unexpected interface-oops event %u\n",
1039 intf_id);
1040 return;
1041 }
1042
1043 dev_info(&svc->dev, "Deactivating interface %u, interface oops reason = %u\n",
1044 intf_id, reason);
1045
1046 mutex_lock(&intf->mutex);
1047 intf->disconnected = true;
1048 gb_interface_disable(intf);
1049 gb_interface_deactivate(intf);
1050 mutex_unlock(&intf->mutex);
1051 }
1052
gb_svc_process_intf_mailbox_event(struct gb_operation * operation)1053 static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
1054 {
1055 struct gb_svc_intf_mailbox_event_request *request;
1056 struct gb_connection *connection = operation->connection;
1057 struct gb_svc *svc = gb_connection_get_data(connection);
1058 struct gb_interface *intf;
1059 u8 intf_id;
1060 u16 result_code;
1061 u32 mailbox;
1062
1063 /* The request message size has already been verified. */
1064 request = operation->request->payload;
1065 intf_id = request->intf_id;
1066 result_code = le16_to_cpu(request->result_code);
1067 mailbox = le32_to_cpu(request->mailbox);
1068
1069 dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
1070 __func__, intf_id, result_code, mailbox);
1071
1072 intf = gb_svc_interface_lookup(svc, intf_id);
1073 if (!intf) {
1074 dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
1075 return;
1076 }
1077
1078 gb_interface_mailbox_event(intf, result_code, mailbox);
1079 }
1080
gb_svc_process_deferred_request(struct work_struct * work)1081 static void gb_svc_process_deferred_request(struct work_struct *work)
1082 {
1083 struct gb_svc_deferred_request *dr;
1084 struct gb_operation *operation;
1085 struct gb_svc *svc;
1086 u8 type;
1087
1088 dr = container_of(work, struct gb_svc_deferred_request, work);
1089 operation = dr->operation;
1090 svc = gb_connection_get_data(operation->connection);
1091 type = operation->request->header->type;
1092
1093 switch (type) {
1094 case GB_SVC_TYPE_SVC_HELLO:
1095 gb_svc_process_hello_deferred(operation);
1096 break;
1097 case GB_SVC_TYPE_MODULE_INSERTED:
1098 gb_svc_process_module_inserted(operation);
1099 break;
1100 case GB_SVC_TYPE_MODULE_REMOVED:
1101 gb_svc_process_module_removed(operation);
1102 break;
1103 case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1104 gb_svc_process_intf_mailbox_event(operation);
1105 break;
1106 case GB_SVC_TYPE_INTF_OOPS:
1107 gb_svc_process_intf_oops(operation);
1108 break;
1109 default:
1110 dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
1111 }
1112
1113 gb_operation_put(operation);
1114 kfree(dr);
1115 }
1116
gb_svc_queue_deferred_request(struct gb_operation * operation)1117 static int gb_svc_queue_deferred_request(struct gb_operation *operation)
1118 {
1119 struct gb_svc *svc = gb_connection_get_data(operation->connection);
1120 struct gb_svc_deferred_request *dr;
1121
1122 dr = kmalloc(sizeof(*dr), GFP_KERNEL);
1123 if (!dr)
1124 return -ENOMEM;
1125
1126 gb_operation_get(operation);
1127
1128 dr->operation = operation;
1129 INIT_WORK(&dr->work, gb_svc_process_deferred_request);
1130
1131 queue_work(svc->wq, &dr->work);
1132
1133 return 0;
1134 }
1135
gb_svc_intf_reset_recv(struct gb_operation * op)1136 static int gb_svc_intf_reset_recv(struct gb_operation *op)
1137 {
1138 struct gb_svc *svc = gb_connection_get_data(op->connection);
1139 struct gb_message *request = op->request;
1140 struct gb_svc_intf_reset_request *reset;
1141 u8 intf_id;
1142
1143 if (request->payload_size < sizeof(*reset)) {
1144 dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n",
1145 request->payload_size, sizeof(*reset));
1146 return -EINVAL;
1147 }
1148 reset = request->payload;
1149
1150 intf_id = reset->intf_id;
1151
1152 /* FIXME Reset the interface here */
1153
1154 return 0;
1155 }
1156
gb_svc_module_inserted_recv(struct gb_operation * op)1157 static int gb_svc_module_inserted_recv(struct gb_operation *op)
1158 {
1159 struct gb_svc *svc = gb_connection_get_data(op->connection);
1160 struct gb_svc_module_inserted_request *request;
1161
1162 if (op->request->payload_size < sizeof(*request)) {
1163 dev_warn(&svc->dev, "short module-inserted request received (%zu < %zu)\n",
1164 op->request->payload_size, sizeof(*request));
1165 return -EINVAL;
1166 }
1167
1168 request = op->request->payload;
1169
1170 dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1171 request->primary_intf_id);
1172
1173 return gb_svc_queue_deferred_request(op);
1174 }
1175
gb_svc_module_removed_recv(struct gb_operation * op)1176 static int gb_svc_module_removed_recv(struct gb_operation *op)
1177 {
1178 struct gb_svc *svc = gb_connection_get_data(op->connection);
1179 struct gb_svc_module_removed_request *request;
1180
1181 if (op->request->payload_size < sizeof(*request)) {
1182 dev_warn(&svc->dev, "short module-removed request received (%zu < %zu)\n",
1183 op->request->payload_size, sizeof(*request));
1184 return -EINVAL;
1185 }
1186
1187 request = op->request->payload;
1188
1189 dev_dbg(&svc->dev, "%s - id = %u\n", __func__,
1190 request->primary_intf_id);
1191
1192 return gb_svc_queue_deferred_request(op);
1193 }
1194
gb_svc_intf_oops_recv(struct gb_operation * op)1195 static int gb_svc_intf_oops_recv(struct gb_operation *op)
1196 {
1197 struct gb_svc *svc = gb_connection_get_data(op->connection);
1198 struct gb_svc_intf_oops_request *request;
1199
1200 if (op->request->payload_size < sizeof(*request)) {
1201 dev_warn(&svc->dev, "short intf-oops request received (%zu < %zu)\n",
1202 op->request->payload_size, sizeof(*request));
1203 return -EINVAL;
1204 }
1205
1206 return gb_svc_queue_deferred_request(op);
1207 }
1208
gb_svc_intf_mailbox_event_recv(struct gb_operation * op)1209 static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op)
1210 {
1211 struct gb_svc *svc = gb_connection_get_data(op->connection);
1212 struct gb_svc_intf_mailbox_event_request *request;
1213
1214 if (op->request->payload_size < sizeof(*request)) {
1215 dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n",
1216 op->request->payload_size, sizeof(*request));
1217 return -EINVAL;
1218 }
1219
1220 request = op->request->payload;
1221
1222 dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
1223
1224 return gb_svc_queue_deferred_request(op);
1225 }
1226
gb_svc_request_handler(struct gb_operation * op)1227 static int gb_svc_request_handler(struct gb_operation *op)
1228 {
1229 struct gb_connection *connection = op->connection;
1230 struct gb_svc *svc = gb_connection_get_data(connection);
1231 u8 type = op->type;
1232 int ret = 0;
1233
1234 /*
1235 * SVC requests need to follow a specific order (at least initially) and
1236 * below code takes care of enforcing that. The expected order is:
1237 * - PROTOCOL_VERSION
1238 * - SVC_HELLO
1239 * - Any other request, but the earlier two.
1240 *
1241 * Incoming requests are guaranteed to be serialized and so we don't
1242 * need to protect 'state' for any races.
1243 */
1244 switch (type) {
1245 case GB_SVC_TYPE_PROTOCOL_VERSION:
1246 if (svc->state != GB_SVC_STATE_RESET)
1247 ret = -EINVAL;
1248 break;
1249 case GB_SVC_TYPE_SVC_HELLO:
1250 if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
1251 ret = -EINVAL;
1252 break;
1253 default:
1254 if (svc->state != GB_SVC_STATE_SVC_HELLO)
1255 ret = -EINVAL;
1256 break;
1257 }
1258
1259 if (ret) {
1260 dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
1261 type, svc->state);
1262 return ret;
1263 }
1264
1265 switch (type) {
1266 case GB_SVC_TYPE_PROTOCOL_VERSION:
1267 ret = gb_svc_version_request(op);
1268 if (!ret)
1269 svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
1270 return ret;
1271 case GB_SVC_TYPE_SVC_HELLO:
1272 ret = gb_svc_hello(op);
1273 if (!ret)
1274 svc->state = GB_SVC_STATE_SVC_HELLO;
1275 return ret;
1276 case GB_SVC_TYPE_INTF_RESET:
1277 return gb_svc_intf_reset_recv(op);
1278 case GB_SVC_TYPE_MODULE_INSERTED:
1279 return gb_svc_module_inserted_recv(op);
1280 case GB_SVC_TYPE_MODULE_REMOVED:
1281 return gb_svc_module_removed_recv(op);
1282 case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
1283 return gb_svc_intf_mailbox_event_recv(op);
1284 case GB_SVC_TYPE_INTF_OOPS:
1285 return gb_svc_intf_oops_recv(op);
1286 default:
1287 dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
1288 return -EINVAL;
1289 }
1290 }
1291
gb_svc_release(struct device * dev)1292 static void gb_svc_release(struct device *dev)
1293 {
1294 struct gb_svc *svc = to_gb_svc(dev);
1295
1296 if (svc->connection)
1297 gb_connection_destroy(svc->connection);
1298 ida_destroy(&svc->device_id_map);
1299 destroy_workqueue(svc->wq);
1300 kfree(svc);
1301 }
1302
1303 struct device_type greybus_svc_type = {
1304 .name = "greybus_svc",
1305 .release = gb_svc_release,
1306 };
1307
gb_svc_create(struct gb_host_device * hd)1308 struct gb_svc *gb_svc_create(struct gb_host_device *hd)
1309 {
1310 struct gb_svc *svc;
1311
1312 svc = kzalloc(sizeof(*svc), GFP_KERNEL);
1313 if (!svc)
1314 return NULL;
1315
1316 svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev));
1317 if (!svc->wq) {
1318 kfree(svc);
1319 return NULL;
1320 }
1321
1322 svc->dev.parent = &hd->dev;
1323 svc->dev.bus = &greybus_bus_type;
1324 svc->dev.type = &greybus_svc_type;
1325 svc->dev.groups = svc_groups;
1326 svc->dev.dma_mask = svc->dev.parent->dma_mask;
1327 device_initialize(&svc->dev);
1328
1329 dev_set_name(&svc->dev, "%d-svc", hd->bus_id);
1330
1331 ida_init(&svc->device_id_map);
1332 svc->state = GB_SVC_STATE_RESET;
1333 svc->hd = hd;
1334
1335 svc->connection = gb_connection_create_static(hd, GB_SVC_CPORT_ID,
1336 gb_svc_request_handler);
1337 if (IS_ERR(svc->connection)) {
1338 dev_err(&svc->dev, "failed to create connection: %ld\n",
1339 PTR_ERR(svc->connection));
1340 goto err_put_device;
1341 }
1342
1343 gb_connection_set_data(svc->connection, svc);
1344
1345 return svc;
1346
1347 err_put_device:
1348 put_device(&svc->dev);
1349 return NULL;
1350 }
1351
gb_svc_add(struct gb_svc * svc)1352 int gb_svc_add(struct gb_svc *svc)
1353 {
1354 int ret;
1355
1356 /*
1357 * The SVC protocol is currently driven by the SVC, so the SVC device
1358 * is added from the connection request handler when enough
1359 * information has been received.
1360 */
1361 ret = gb_connection_enable(svc->connection);
1362 if (ret)
1363 return ret;
1364
1365 return 0;
1366 }
1367
gb_svc_remove_modules(struct gb_svc * svc)1368 static void gb_svc_remove_modules(struct gb_svc *svc)
1369 {
1370 struct gb_host_device *hd = svc->hd;
1371 struct gb_module *module, *tmp;
1372
1373 list_for_each_entry_safe(module, tmp, &hd->modules, hd_node) {
1374 gb_module_del(module);
1375 list_del(&module->hd_node);
1376 gb_module_put(module);
1377 }
1378 }
1379
gb_svc_del(struct gb_svc * svc)1380 void gb_svc_del(struct gb_svc *svc)
1381 {
1382 gb_connection_disable_rx(svc->connection);
1383
1384 /*
1385 * The SVC device may have been registered from the request handler.
1386 */
1387 if (device_is_registered(&svc->dev)) {
1388 gb_svc_debugfs_exit(svc);
1389 gb_svc_watchdog_destroy(svc);
1390 device_del(&svc->dev);
1391 }
1392
1393 flush_workqueue(svc->wq);
1394
1395 gb_svc_remove_modules(svc);
1396
1397 gb_connection_disable(svc->connection);
1398 }
1399
gb_svc_put(struct gb_svc * svc)1400 void gb_svc_put(struct gb_svc *svc)
1401 {
1402 put_device(&svc->dev);
1403 }
1404