summaryrefslogtreecommitdiffstats
path: root/drivers/greybus/control.c
blob: 359a2584197397dc5351fa0f01b1c3ac5a79444f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
// SPDX-License-Identifier: GPL-2.0
/*
 * Greybus CPort control protocol.
 *
 * Copyright 2015 Google Inc.
 * Copyright 2015 Linaro Ltd.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/greybus.h>

/* Highest control-protocol version supported */
#define GB_CONTROL_VERSION_MAJOR	0
#define GB_CONTROL_VERSION_MINOR	1

static int gb_control_get_version(struct gb_control *control)
{
	struct gb_interface *intf = control->connection->intf;
	struct gb_control_version_request request;
	struct gb_control_version_response response;
	int ret;

	request.major = GB_CONTROL_VERSION_MAJOR;
	request.minor = GB_CONTROL_VERSION_MINOR;

	ret = gb_operation_sync(control->connection,
				GB_CONTROL_TYPE_VERSION,
				&request, sizeof(request), &response,
				sizeof(response));
	if (ret) {
		dev_err(&intf->dev,
			"failed to get control-protocol version: %d\n",
			ret);
		return ret;
	}

	if (response.major > request.major) {
		dev_err(&intf->dev,
			"unsupported major control-protocol version (%u > %u)\n",
			response.major, request.major);
		return -ENOTSUPP;
	}

	control->protocol_major = response.major;
	control->protocol_minor = response.minor;

	dev_dbg(&intf->dev, "%s - %u.%u\n", __func__, response.major,
		response.minor);

	return 0;
}

static int gb_control_get_bundle_version(struct gb_control *control,
					 struct gb_bundle *bundle)
{
	struct gb_interface *intf = control->connection->intf;
	struct gb_control_bundle_version_request request;
	struct gb_control_bundle_version_response response;
	int ret;

	request.bundle_id = bundle->id;

	ret = gb_operation_sync(control->connection,
				GB_CONTROL_TYPE_BUNDLE_VERSION,
				&request, sizeof(request),
				&response, sizeof(response));
	if (ret) {
		dev_err(&intf->dev,
			"failed to get bundle %u class version: %d\n",
			bundle->id, ret);
		return ret;
	}

	bundle->class_major = response.major;
	bundle->class_minor = response.minor;

	dev_dbg(&intf->dev, "%s - %u: %u.%u\n", __func__, bundle->id,
		response.major, response.minor);

	return 0;
}

int gb_control_get_bundle_versions(struct gb_control *control)
{
	struct gb_interface *intf = control->connection->intf;
	struct gb_bundle *bundle;
	int ret;

	if (!control->has_bundle_version)
		return 0;

	list_for_each_entry(bundle, &intf->bundles, links) {
		ret = gb_control_get_bundle_version(control, bundle);
		if (ret)
			return ret;
	}

	return 0;
}

/* Get Manifest's size from the interface */
int gb_control_get_manifest_size_operation(struct gb_interface *intf)
{
	struct gb_control_get_manifest_size_response response;
	struct gb_connection *connection = intf->control->connection;
	int ret;

	ret = gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST_SIZE,
				NULL, 0, &response, sizeof(response));
	if (ret) {
		dev_err(&connection->intf->dev,
			"failed to get manifest size: %d\n", ret);
		return ret;
	}

	return le16_to_cpu(response.size);
}

/* Reads Manifest from the interface */
int gb_control_get_manifest_operation(struct gb_interface *intf, void *manifest,
				      size_t size)
{
	struct gb_connection *connection = intf->control->connection;

	return gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST,
				NULL, 0, manifest, size);
}

int gb_control_connected_operation(struct gb_control *control, u16 cport_id)
{
	struct gb_control_connected_request request;

	request.cport_id = cpu_to_le16(cport_id);
	return gb_operation_sync(control->connection, GB_CONTROL_TYPE_CONNECTED,
				 &request, sizeof(request), NULL, 0);
}

int gb_control_disconnected_operation(struct gb_control *control, u16 cport_id)
{
	struct gb_control_disconnected_request request;

	request.cport_id = cpu_to_le16(cport_id);
	return gb_operation_sync(control->connection,
				 GB_CONTROL_TYPE_DISCONNECTED, &request,
				 sizeof(request), NULL, 0);
}

int gb_control_disconnecting_operation(struct gb_control *control,
				       u16 cport_id)
{
	struct gb_control_disconnecting_request *request;
	struct gb_operation *operation;
	int ret;

	operation = gb_operation_create_core(control->connection,
					     GB_CONTROL_TYPE_DISCONNECTING,
					     sizeof(*request), 0, 0,
					     GFP_KERNEL);
	if (!operation)
		return -ENOMEM;

	request = operation->request->payload;
	request->cport_id = cpu_to_le16(cport_id);

	ret = gb_operation_request_send_sync(operation);
	if (ret) {
		dev_err(&control->dev, "failed to send disconnecting: %d\n",
			ret);
	}

	gb_operation_put(operation);

	return ret;
}

int gb_control_mode_switch_operation(struct gb_control *control)
{
	struct gb_operation *operation;
	int ret;

	operation = gb_operation_create_core(control->connection,
					     GB_CONTROL_TYPE_MODE_SWITCH,
					     0, 0,
					     GB_OPERATION_FLAG_UNIDIRECTIONAL,
					     GFP_KERNEL);
	if (!operation)
		return -ENOMEM;

	ret = gb_operation_request_send_sync(operation);
	if (ret)
		dev_err(&control->dev, "failed to send mode switch: %d\n", ret);

	gb_operation_put(operation);

	return ret;
}

static int gb_control_bundle_pm_status_map(u8 status)
{
	switch (status) {
	case GB_CONTROL_BUNDLE_PM_INVAL:
		return -EINVAL;
	case GB_CONTROL_BUNDLE_PM_BUSY:
		return -EBUSY;
	case GB_CONTROL_BUNDLE_PM_NA:
		return -ENOMSG;
	case GB_CONTROL_BUNDLE_PM_FAIL:
	default:
		return -EREMOTEIO;
	}
}

int gb_control_bundle_suspend(struct gb_control *control, u8 bundle_id)
{
	struct gb_control_bundle_pm_request request;
	struct gb_control_bundle_pm_response response;
	int ret;

	request.bundle_id = bundle_id;
	ret = gb_operation_sync(control->connection,
				GB_CONTROL_TYPE_BUNDLE_SUSPEND, &request,
				sizeof(request), &response, sizeof(response));
	if (ret) {
		dev_err(&control->dev, "failed to send bundle %u suspend: %d\n",
			bundle_id, ret);
		return ret;
	}

	if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
		dev_err(&control->dev, "failed to suspend bundle %u: %d\n",
			bundle_id, response.status);
		return gb_control_bundle_pm_status_map(response.status);
	}

	return 0;
}

int gb_control_bundle_resume(struct gb_control *control, u8 bundle_id)
{
	struct gb_control_bundle_pm_request request;
	struct gb_control_bundle_pm_response response;
	int ret;

	request.bundle_id = bundle_id;
	ret = gb_operation_sync(control->connection,
				GB_CONTROL_TYPE_BUNDLE_RESUME, &request,
				sizeof(request), &response, sizeof(response));
	if (ret) {
		dev_err(&control->dev, "failed to send bundle %u resume: %d\n",
			bundle_id, ret);
		return ret;
	}

	if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
		dev_err(&control->dev, "failed to resume bundle %u: %d\n",
			bundle_id, response.status);
		return gb_control_bundle_pm_status_map(response.status);
	}

	return 0;
}

int gb_control_bundle_deactivate(struct gb_control *control, u8 bundle_id)
{
	struct gb_control_bundle_pm_request request;
	struct gb_control_bundle_pm_response response;
	int ret;

	request.bundle_id = bundle_id;
	ret = gb_operation_sync(control->connection,
				GB_CONTROL_TYPE_BUNDLE_DEACTIVATE, &request,
				sizeof(request), &response, sizeof(response));
	if (ret) {
		dev_err(&control->dev,
			"failed to send bundle %u deactivate: %d\n", bundle_id,
			ret);
		return ret;
	}

	if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
		dev_err(&control->dev, "failed to deactivate bundle %u: %d\n",
			bundle_id, response.status);
		return gb_control_bundle_pm_status_map(response.status);
	}

	return 0;
}

int gb_control_bundle_activate(struct gb_control *control, u8 bundle_id)
{
	struct gb_control_bundle_pm_request request;
	struct gb_control_bundle_pm_response response;
	int ret;

	if (!control->has_bundle_activate)
		return 0;

	request.bundle_id = bundle_id;
	ret = gb_operation_sync(control->connection,
				GB_CONTROL_TYPE_BUNDLE_ACTIVATE, &request,
				sizeof(request), &response, sizeof(response));
	if (ret) {
		dev_err(&control->dev,
			"failed to send bundle %u activate: %d\n", bundle_id,
			ret);
		return ret;
	}

	if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
		dev_err(&control->dev, "failed to activate bundle %u: %d\n",
			bundle_id, response.status);
		return gb_control_bundle_pm_status_map(response.status);
	}

	return 0;
}

static int gb_control_interface_pm_status_map(u8 status)
{
	switch (status) {
	case GB_CONTROL_INTF_PM_BUSY:
		return -EBUSY;
	case GB_CONTROL_INTF_PM_NA:
		return -ENOMSG;
	default:
		return -EREMOTEIO;
	}
}

int gb_control_interface_suspend_prepare(struct gb_control *control)
{
	struct gb_control_intf_pm_response response;
	int ret;

	ret = gb_operation_sync(control->connection,
				GB_CONTROL_TYPE_INTF_SUSPEND_PREPARE, NULL, 0,
				&response, sizeof(response));
	if (ret) {
		dev_err(&control->dev,
			"failed to send interface suspend prepare: %d\n", ret);
		return ret;
	}

	if (response.status != GB_CONTROL_INTF_PM_OK) {
		dev_err(&control->dev, "interface error while preparing suspend: %d\n",
			response.status);
		return gb_control_interface_pm_status_map(response.status);
	}

	return 0;
}

int gb_control_interface_deactivate_prepare(struct gb_control *control)
{
	struct gb_control_intf_pm_response response;
	int ret;

	ret = gb_operation_sync(control->connection,
				GB_CONTROL_TYPE_INTF_DEACTIVATE_PREPARE, NULL,
				0, &response, sizeof(response));
	if (ret) {
		dev_err(&control->dev, "failed to send interface deactivate prepare: %d\n",
			ret);
		return ret;
	}

	if (response.status != GB_CONTROL_INTF_PM_OK) {
		dev_err(&control->dev, "interface error while preparing deactivate: %d\n",
			response.status);
		return gb_control_interface_pm_status_map(response.status);
	}

	return 0;
}

int gb_control_interface_hibernate_abort(struct gb_control *control)
{
	struct gb_control_intf_pm_response response;
	int ret;

	ret = gb_operation_sync(control->connection,
				GB_CONTROL_TYPE_INTF_HIBERNATE_ABORT, NULL, 0,
				&response, sizeof(response));
	if (ret) {
		dev_err(&control->dev,
			"failed to send interface aborting hibernate: %d\n",
			ret);
		return ret;
	}

	if (response.status != GB_CONTROL_INTF_PM_OK) {
		dev_err(&control->dev, "interface error while aborting hibernate: %d\n",
			response.status);
		return gb_control_interface_pm_status_map(response.status);
	}

	return 0;
}

static ssize_t vendor_string_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct gb_control *control = to_gb_control(dev);

	return scnprintf(buf, PAGE_SIZE, "%s\n", control->vendor_string);
}
static DEVICE_ATTR_RO(vendor_string);

static ssize_t product_string_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct gb_control *control = to_gb_control(dev);

	return scnprintf(buf, PAGE_SIZE, "%s\n", control->product_string);
}
static DEVICE_ATTR_RO(product_string);

static struct attribute *control_attrs[] = {
	&dev_attr_vendor_string.attr,
	&dev_attr_product_string.attr,
	NULL,
};
ATTRIBUTE_GROUPS(control);

static void gb_control_release(struct device *dev)
{
	struct gb_control *control = to_gb_control(dev);

	gb_connection_destroy(control->connection);

	kfree(control->vendor_string);
	kfree(control->product_string);

	kfree(control);
}

struct device_type greybus_control_type = {
	.name =		"greybus_control",
	.release =	gb_control_release,
};

struct gb_control *gb_control_create(struct gb_interface *intf)
{
	struct gb_connection *connection;
	struct gb_control *control;

	control = kzalloc(sizeof(*control), GFP_KERNEL);
	if (!control)
		return ERR_PTR(-ENOMEM);

	control->intf = intf;

	connection = gb_connection_create_control(intf);
	if (IS_ERR(connection)) {
		dev_err(&intf->dev,
			"failed to create control connection: %ld\n",
			PTR_ERR(connection));
		kfree(control);
		return ERR_CAST(connection);
	}

	control->connection = connection;

	control->dev.parent = &intf->dev;
	control->dev.bus = &greybus_bus_type;
	control->dev.type = &greybus_control_type;
	control->dev.groups = control_groups;
	control->dev.dma_mask = intf->dev.dma_mask;
	device_initialize(&control->dev);
	dev_set_name(&control->dev, "%s.ctrl", dev_name(&intf->dev));

	gb_connection_set_data(control->connection, control);

	return control;
}

int gb_control_enable(struct gb_control *control)
{
	int ret;

	dev_dbg(&control->connection->intf->dev, "%s\n", __func__);

	ret = gb_connection_enable_tx(control->connection);
	if (ret) {
		dev_err(&control->connection->intf->dev,
			"failed to enable control connection: %d\n",
			ret);
		return ret;
	}

	ret = gb_control_get_version(control);
	if (ret)
		goto err_disable_connection;

	if (control->protocol_major > 0 || control->protocol_minor > 1)
		control->has_bundle_version = true;

	/* FIXME: use protocol version instead */
	if (!(control->intf->quirks & GB_INTERFACE_QUIRK_NO_BUNDLE_ACTIVATE))
		control->has_bundle_activate = true;

	return 0;

err_disable_connection:
	gb_connection_disable(control->connection);

	return ret;
}

void gb_control_disable(struct gb_control *control)
{
	dev_dbg(&control->connection->intf->dev, "%s\n", __func__);

	if (control->intf->disconnected)
		gb_connection_disable_forced(control->connection);
	else
		gb_connection_disable(control->connection);
}

int gb_control_suspend(struct gb_control *control)
{
	gb_connection_disable(control->connection);

	return 0;
}

int gb_control_resume(struct gb_control *control)
{
	int ret;

	ret = gb_connection_enable_tx(control->connection);
	if (ret) {
		dev_err(&control->connection->intf->dev,
			"failed to enable control connection: %d\n", ret);
		return ret;
	}

	return 0;
}

int gb_control_add(struct gb_control *control)
{
	int ret;

	ret = device_add(&control->dev);
	if (ret) {
		dev_err(&control->dev,
			"failed to register control device: %d\n",
			ret);
		return ret;
	}

	return 0;
}

void gb_control_del(struct gb_control *control)
{
	if (device_is_registered(&control->dev))
		device_del(&control->dev);
}

struct gb_control *gb_control_get(struct gb_control *control)
{
	get_device(&control->dev);

	return control;
}

void gb_control_put(struct gb_control *control)
{
	put_device(&control->dev);
}

void gb_control_mode_switch_prepare(struct gb_control *control)
{
	gb_connection_mode_switch_prepare(control->connection);
}

void gb_control_mode_switch_complete(struct gb_control *control)
{
	gb_connection_mode_switch_complete(control->connection);
}