summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/drm_sysfs.c
blob: 684bd4a138439ef254f7123c66ffde989fede279 (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
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
/*
 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
 *               extra sysfs attribute from DRM. Normal drm_sysfs_class
 *               does not allow adding attributes.
 *
 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (c) 2003-2004 IBM Corp.
 *
 * This file is released under the GPLv2
 *
 */

#include <linux/device.h>
#include <linux/kdev_t.h>
#include <linux/gfp.h>
#include <linux/err.h>
#include <linux/export.h>

#include <drm/drm_sysfs.h>
#include <drm/drm_core.h>
#include <drm/drmP.h>
#include "drm_internal.h"

#define to_drm_minor(d) dev_get_drvdata(d)
#define to_drm_connector(d) dev_get_drvdata(d)

static struct device_type drm_sysfs_device_minor = {
	.name = "drm_minor"
};

/**
 * __drm_class_suspend - internal DRM class suspend routine
 * @dev: Linux device to suspend
 * @state: power state to enter
 *
 * Just figures out what the actual struct drm_device associated with
 * @dev is and calls its suspend hook, if present.
 */
static int __drm_class_suspend(struct device *dev, pm_message_t state)
{
	if (dev->type == &drm_sysfs_device_minor) {
		struct drm_minor *drm_minor = to_drm_minor(dev);
		struct drm_device *drm_dev = drm_minor->dev;

		if (drm_minor->type == DRM_MINOR_LEGACY &&
		    !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
		    drm_dev->driver->suspend)
			return drm_dev->driver->suspend(drm_dev, state);
	}
	return 0;
}

/**
 * drm_class_suspend - internal DRM class suspend hook. Simply calls
 * __drm_class_suspend() with the correct pm state.
 * @dev: Linux device to suspend
 */
static int drm_class_suspend(struct device *dev)
{
	return __drm_class_suspend(dev, PMSG_SUSPEND);
}

/**
 * drm_class_freeze - internal DRM class freeze hook. Simply calls
 * __drm_class_suspend() with the correct pm state.
 * @dev: Linux device to freeze
 */
static int drm_class_freeze(struct device *dev)
{
	return __drm_class_suspend(dev, PMSG_FREEZE);
}

/**
 * drm_class_resume - DRM class resume hook
 * @dev: Linux device to resume
 *
 * Just figures out what the actual struct drm_device associated with
 * @dev is and calls its resume hook, if present.
 */
static int drm_class_resume(struct device *dev)
{
	if (dev->type == &drm_sysfs_device_minor) {
		struct drm_minor *drm_minor = to_drm_minor(dev);
		struct drm_device *drm_dev = drm_minor->dev;

		if (drm_minor->type == DRM_MINOR_LEGACY &&
		    !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
		    drm_dev->driver->resume)
			return drm_dev->driver->resume(drm_dev);
	}
	return 0;
}

static const struct dev_pm_ops drm_class_dev_pm_ops = {
	.suspend	= drm_class_suspend,
	.resume		= drm_class_resume,
	.freeze		= drm_class_freeze,
};

static char *drm_devnode(struct device *dev, umode_t *mode)
{
	return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
}

static CLASS_ATTR_STRING(version, S_IRUGO,
		CORE_NAME " "
		__stringify(CORE_MAJOR) "."
		__stringify(CORE_MINOR) "."
		__stringify(CORE_PATCHLEVEL) " "
		CORE_DATE);

/**
 * drm_sysfs_create - create a struct drm_sysfs_class structure
 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
 * @name: pointer to a string for the name of this class.
 *
 * This is used to create DRM class pointer that can then be used
 * in calls to drm_sysfs_device_add().
 *
 * Note, the pointer created here is to be destroyed when finished by making a
 * call to drm_sysfs_destroy().
 */
struct class *drm_sysfs_create(struct module *owner, char *name)
{
	struct class *class;
	int err;

	class = class_create(owner, name);
	if (IS_ERR(class)) {
		err = PTR_ERR(class);
		goto err_out;
	}

	class->pm = &drm_class_dev_pm_ops;

	err = class_create_file(class, &class_attr_version.attr);
	if (err)
		goto err_out_class;

	class->devnode = drm_devnode;

	return class;

err_out_class:
	class_destroy(class);
err_out:
	return ERR_PTR(err);
}

/**
 * drm_sysfs_destroy - destroys DRM class
 *
 * Destroy the DRM device class.
 */
void drm_sysfs_destroy(void)
{
	if ((drm_class == NULL) || (IS_ERR(drm_class)))
		return;
	class_remove_file(drm_class, &class_attr_version.attr);
	class_destroy(drm_class);
	drm_class = NULL;
}

/*
 * Connector properties
 */
static ssize_t status_store(struct device *device,
			   struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct drm_connector *connector = to_drm_connector(device);
	struct drm_device *dev = connector->dev;
	enum drm_connector_status old_status;
	int ret;

	ret = mutex_lock_interruptible(&dev->mode_config.mutex);
	if (ret)
		return ret;

	old_status = connector->status;

	if (sysfs_streq(buf, "detect")) {
		connector->force = 0;
		connector->status = connector->funcs->detect(connector, true);
	} else if (sysfs_streq(buf, "on")) {
		connector->force = DRM_FORCE_ON;
	} else if (sysfs_streq(buf, "on-digital")) {
		connector->force = DRM_FORCE_ON_DIGITAL;
	} else if (sysfs_streq(buf, "off")) {
		connector->force = DRM_FORCE_OFF;
	} else
		ret = -EINVAL;

	if (ret == 0 && connector->force) {
		if (connector->force == DRM_FORCE_ON ||
		    connector->force == DRM_FORCE_ON_DIGITAL)
			connector->status = connector_status_connected;
		else
			connector->status = connector_status_disconnected;
		if (connector->funcs->force)
			connector->funcs->force(connector);
	}

	if (old_status != connector->status) {
		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
			      connector->base.id,
			      connector->name,
			      old_status, connector->status);

		dev->mode_config.delayed_event = true;
		if (dev->mode_config.poll_enabled)
			schedule_delayed_work(&dev->mode_config.output_poll_work,
					      0);
	}

	mutex_unlock(&dev->mode_config.mutex);

	return ret ? ret : count;
}

static ssize_t status_show(struct device *device,
			   struct device_attribute *attr,
			   char *buf)
{
	struct drm_connector *connector = to_drm_connector(device);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			drm_get_connector_status_name(connector->status));
}

static ssize_t dpms_show(struct device *device,
			   struct device_attribute *attr,
			   char *buf)
{
	struct drm_connector *connector = to_drm_connector(device);
	int dpms;

	dpms = READ_ONCE(connector->dpms);

	return snprintf(buf, PAGE_SIZE, "%s\n",
			drm_get_dpms_name(dpms));
}

static ssize_t enabled_show(struct device *device,
			    struct device_attribute *attr,
			   char *buf)
{
	struct drm_connector *connector = to_drm_connector(device);

	return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
			"disabled");
}

static ssize_t edid_show(struct file *filp, struct kobject *kobj,
			 struct bin_attribute *attr, char *buf, loff_t off,
			 size_t count)
{
	struct device *connector_dev = container_of(kobj, struct device, kobj);
	struct drm_connector *connector = to_drm_connector(connector_dev);
	unsigned char *edid;
	size_t size;

	if (!connector->edid_blob_ptr)
		return 0;

	edid = connector->edid_blob_ptr->data;
	size = connector->edid_blob_ptr->length;
	if (!edid)
		return 0;

	if (off >= size)
		return 0;

	if (off + count > size)
		count = size - off;
	memcpy(buf, edid + off, count);

	return count;
}

static ssize_t modes_show(struct device *device,
			   struct device_attribute *attr,
			   char *buf)
{
	struct drm_connector *connector = to_drm_connector(device);
	struct drm_display_mode *mode;
	int written = 0;

	list_for_each_entry(mode, &connector->modes, head) {
		written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
				    mode->name);
	}

	return written;
}

static ssize_t tv_subconnector_show(struct device *device,
				    struct device_attribute *attr,
				    char *buf)
{
	struct drm_connector *connector = to_drm_connector(device);
	struct drm_device *dev = connector->dev;
	struct drm_property *prop;
	uint64_t subconnector;
	int ret;

	prop = dev->mode_config.tv_subconnector_property;
	if (!prop) {
		DRM_ERROR("Unable to find subconnector property\n");
		return 0;
	}

	ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
	if (ret)
		return 0;

	return snprintf(buf, PAGE_SIZE, "%s",
			drm_get_tv_subconnector_name((int)subconnector));
}

static ssize_t tv_select_subconnector_show(struct device *device,
					   struct device_attribute *attr,
					   char *buf)
{
	struct drm_connector *connector = to_drm_connector(device);
	struct drm_device *dev = connector->dev;
	struct drm_property *prop;
	uint64_t subconnector;
	int ret;

	prop = dev->mode_config.tv_select_subconnector_property;
	if (!prop) {
		DRM_ERROR("Unable to find select subconnector property\n");
		return 0;
	}

	ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
	if (ret)
		return 0;

	return snprintf(buf, PAGE_SIZE, "%s",
			drm_get_tv_select_name((int)subconnector));
}

static ssize_t dvii_subconnector_show(struct device *device,
				      struct device_attribute *attr,
				      char *buf)
{
	struct drm_connector *connector = to_drm_connector(device);
	struct drm_device *dev = connector->dev;
	struct drm_property *prop;
	uint64_t subconnector;
	int ret;

	prop = dev->mode_config.dvi_i_subconnector_property;
	if (!prop) {
		DRM_ERROR("Unable to find subconnector property\n");
		return 0;
	}

	ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
	if (ret)
		return 0;

	return snprintf(buf, PAGE_SIZE, "%s",
			drm_get_dvi_i_subconnector_name((int)subconnector));
}

static ssize_t dvii_select_subconnector_show(struct device *device,
					     struct device_attribute *attr,
					     char *buf)
{
	struct drm_connector *connector = to_drm_connector(device);
	struct drm_device *dev = connector->dev;
	struct drm_property *prop;
	uint64_t subconnector;
	int ret;

	prop = dev->mode_config.dvi_i_select_subconnector_property;
	if (!prop) {
		DRM_ERROR("Unable to find select subconnector property\n");
		return 0;
	}

	ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
	if (ret)
		return 0;

	return snprintf(buf, PAGE_SIZE, "%s",
			drm_get_dvi_i_select_name((int)subconnector));
}

static DEVICE_ATTR_RW(status);
static DEVICE_ATTR_RO(enabled);
static DEVICE_ATTR_RO(dpms);
static DEVICE_ATTR_RO(modes);

static struct attribute *connector_dev_attrs[] = {
	&dev_attr_status.attr,
	&dev_attr_enabled.attr,
	&dev_attr_dpms.attr,
	&dev_attr_modes.attr,
	NULL
};

static DEVICE_ATTR_RO(tv_subconnector);
static DEVICE_ATTR_RO(tv_select_subconnector);

static struct attribute *connector_tv_dev_attrs[] = {
	&dev_attr_tv_subconnector.attr,
	&dev_attr_tv_select_subconnector.attr,
	NULL
};

static DEVICE_ATTR_RO(dvii_subconnector);
static DEVICE_ATTR_RO(dvii_select_subconnector);

static struct attribute *connector_dvii_dev_attrs[] = {
	&dev_attr_dvii_subconnector.attr,
	&dev_attr_dvii_select_subconnector.attr,
	NULL
};

/* Connector type related helpers */
static int kobj_connector_type(struct kobject *kobj)
{
	struct device *dev = kobj_to_dev(kobj);
	struct drm_connector *connector = to_drm_connector(dev);

	return connector->connector_type;
}

static umode_t connector_is_dvii(struct kobject *kobj,
				 struct attribute *attr, int idx)
{
	return kobj_connector_type(kobj) == DRM_MODE_CONNECTOR_DVII ?
		attr->mode : 0;
}

static umode_t connector_is_tv(struct kobject *kobj,
			       struct attribute *attr, int idx)
{
	switch (kobj_connector_type(kobj)) {
	case DRM_MODE_CONNECTOR_Composite:
	case DRM_MODE_CONNECTOR_SVIDEO:
	case DRM_MODE_CONNECTOR_Component:
	case DRM_MODE_CONNECTOR_TV:
		return attr->mode;
	}

	return 0;
}

static struct bin_attribute edid_attr = {
	.attr.name = "edid",
	.attr.mode = 0444,
	.size = 0,
	.read = edid_show,
};

static struct bin_attribute *connector_bin_attrs[] = {
	&edid_attr,
	NULL
};

static const struct attribute_group connector_dev_group = {
	.attrs = connector_dev_attrs,
	.bin_attrs = connector_bin_attrs,
};

static const struct attribute_group connector_tv_dev_group = {
	.attrs = connector_tv_dev_attrs,
	.is_visible = connector_is_tv,
};

static const struct attribute_group connector_dvii_dev_group = {
	.attrs = connector_dvii_dev_attrs,
	.is_visible = connector_is_dvii,
};

static const struct attribute_group *connector_dev_groups[] = {
	&connector_dev_group,
	&connector_tv_dev_group,
	&connector_dvii_dev_group,
	NULL
};

/**
 * drm_sysfs_connector_add - add a connector to sysfs
 * @connector: connector to add
 *
 * Create a connector device in sysfs, along with its associated connector
 * properties (so far, connection status, dpms, mode list & edid) and
 * generate a hotplug event so userspace knows there's a new connector
 * available.
 */
int drm_sysfs_connector_add(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;

	if (connector->kdev)
		return 0;

	connector->kdev =
		device_create_with_groups(drm_class, dev->primary->kdev, 0,
					  connector, connector_dev_groups,
					  "card%d-%s", dev->primary->index,
					  connector->name);
	DRM_DEBUG("adding \"%s\" to sysfs\n",
		  connector->name);

	if (IS_ERR(connector->kdev)) {
		DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
		return PTR_ERR(connector->kdev);
	}

	/* Let userspace know we have a new connector */
	drm_sysfs_hotplug_event(dev);

	return 0;
}

/**
 * drm_sysfs_connector_remove - remove an connector device from sysfs
 * @connector: connector to remove
 *
 * Remove @connector and its associated attributes from sysfs.  Note that
 * the device model core will take care of sending the "remove" uevent
 * at this time, so we don't need to do it.
 *
 * Note:
 * This routine should only be called if the connector was previously
 * successfully registered.  If @connector hasn't been registered yet,
 * you'll likely see a panic somewhere deep in sysfs code when called.
 */
void drm_sysfs_connector_remove(struct drm_connector *connector)
{
	if (!connector->kdev)
		return;
	DRM_DEBUG("removing \"%s\" from sysfs\n",
		  connector->name);

	device_unregister(connector->kdev);
	connector->kdev = NULL;
}

/**
 * drm_sysfs_hotplug_event - generate a DRM uevent
 * @dev: DRM device
 *
 * Send a uevent for the DRM device specified by @dev.  Currently we only
 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
 * deal with other types of events.
 */
void drm_sysfs_hotplug_event(struct drm_device *dev)
{
	char *event_string = "HOTPLUG=1";
	char *envp[] = { event_string, NULL };

	DRM_DEBUG("generating hotplug event\n");

	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
}
EXPORT_SYMBOL(drm_sysfs_hotplug_event);

static void drm_sysfs_release(struct device *dev)
{
	kfree(dev);
}

/**
 * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
 * @minor: minor to allocate sysfs device for
 *
 * This allocates a new sysfs device for @minor and returns it. The device is
 * not registered nor linked. The caller has to use device_add() and
 * device_del() to register and unregister it.
 *
 * Note that dev_get_drvdata() on the new device will return the minor.
 * However, the device does not hold a ref-count to the minor nor to the
 * underlying drm_device. This is unproblematic as long as you access the
 * private data only in sysfs callbacks. device_del() disables those
 * synchronously, so they cannot be called after you cleanup a minor.
 */
struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
{
	const char *minor_str;
	struct device *kdev;
	int r;

	if (minor->type == DRM_MINOR_CONTROL)
		minor_str = "controlD%d";
	else if (minor->type == DRM_MINOR_RENDER)
		minor_str = "renderD%d";
	else
		minor_str = "card%d";

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

	device_initialize(kdev);
	kdev->devt = MKDEV(DRM_MAJOR, minor->index);
	kdev->class = drm_class;
	kdev->type = &drm_sysfs_device_minor;
	kdev->parent = minor->dev->dev;
	kdev->release = drm_sysfs_release;
	dev_set_drvdata(kdev, minor);

	r = dev_set_name(kdev, minor_str, minor->index);
	if (r < 0)
		goto err_free;

	return kdev;

err_free:
	put_device(kdev);
	return ERR_PTR(r);
}

/**
 * drm_class_device_register - Register a struct device in the drm class.
 *
 * @dev: pointer to struct device to register.
 *
 * @dev should have all relevant members pre-filled with the exception
 * of the class member. In particular, the device_type member must
 * be set.
 */

int drm_class_device_register(struct device *dev)
{
	if (!drm_class || IS_ERR(drm_class))
		return -ENOENT;

	dev->class = drm_class;
	return device_register(dev);
}
EXPORT_SYMBOL_GPL(drm_class_device_register);

void drm_class_device_unregister(struct device *dev)
{
	return device_unregister(dev);
}
EXPORT_SYMBOL_GPL(drm_class_device_unregister);