summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_sysfs.c
blob: 968a9560b4aa312798540d6bab32e27c883cb612 (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
// SPDX-License-Identifier: GPL-2.0-only

/*
 * 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.
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/i2c.h>
#include <linux/kdev_t.h>
#include <linux/slab.h>

#include <drm/drm_connector.h>
#include <drm/drm_device.h>
#include <drm/drm_file.h>
#include <drm/drm_modes.h>
#include <drm/drm_print.h>
#include <drm/drm_property.h>
#include <drm/drm_sysfs.h>

#include "drm_internal.h"
#include "drm_crtc_internal.h"

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

/**
 * DOC: overview
 *
 * DRM provides very little additional support to drivers for sysfs
 * interactions, beyond just all the standard stuff. Drivers who want to expose
 * additional sysfs properties and property groups can attach them at either
 * &drm_device.dev or &drm_connector.kdev.
 *
 * Registration is automatically handled when calling drm_dev_register(), or
 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
 * also automatically handled by drm_dev_unregister() and
 * drm_connector_unregister().
 */

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

struct class *drm_class;

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, "drm 1.1.0 20060810");

/**
 * drm_sysfs_init - initialize sysfs helpers
 *
 * This is used to create the DRM class, which is the implicit parent of any
 * other top-level DRM sysfs objects.
 *
 * You must call drm_sysfs_destroy() to release the allocated resources.
 *
 * Return: 0 on success, negative error code on failure.
 */
int drm_sysfs_init(void)
{
	int err;

	drm_class = class_create(THIS_MODULE, "drm");
	if (IS_ERR(drm_class))
		return PTR_ERR(drm_class);

	err = class_create_file(drm_class, &class_attr_version.attr);
	if (err) {
		class_destroy(drm_class);
		drm_class = NULL;
		return err;
	}

	drm_class->devnode = drm_devnode;
	return 0;
}

/**
 * drm_sysfs_destroy - destroys DRM class
 *
 * Destroy the DRM device class.
 */
void drm_sysfs_destroy(void)
{
	if (IS_ERR_OR_NULL(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_force old_force;
	int ret;

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

	old_force = connector->force;

	if (sysfs_streq(buf, "detect"))
		connector->force = 0;
	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 (old_force != connector->force || !connector->force) {
		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
			      connector->base.id,
			      connector->name,
			      old_force, connector->force);

		connector->funcs->fill_modes(connector,
					     dev->mode_config.max_width,
					     dev->mode_config.max_height);
	}

	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);
	enum drm_connector_status status;

	status = READ_ONCE(connector->status);

	return sysfs_emit(buf, "%s\n",
			  drm_get_connector_status_name(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 sysfs_emit(buf, "%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);
	bool enabled;

	enabled = READ_ONCE(connector->encoder);

	return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
}

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 = kobj_to_dev(kobj);
	struct drm_connector *connector = to_drm_connector(connector_dev);
	unsigned char *edid;
	size_t size;
	ssize_t ret = 0;

	mutex_lock(&connector->dev->mode_config.mutex);
	if (!connector->edid_blob_ptr)
		goto unlock;

	edid = connector->edid_blob_ptr->data;
	size = connector->edid_blob_ptr->length;
	if (!edid)
		goto unlock;

	if (off >= size)
		goto unlock;

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

	ret = count;
unlock:
	mutex_unlock(&connector->dev->mode_config.mutex);

	return ret;
}

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;

	mutex_lock(&connector->dev->mode_config.mutex);
	list_for_each_entry(mode, &connector->modes, head) {
		written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
				    mode->name);
	}
	mutex_unlock(&connector->dev->mode_config.mutex);

	return written;
}

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 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_dev_groups[] = {
	&connector_dev_group,
	NULL
};

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);
	}

	if (connector->ddc)
		return sysfs_create_link(&connector->kdev->kobj,
				 &connector->ddc->dev.kobj, "ddc");
	return 0;
}

void drm_sysfs_connector_remove(struct drm_connector *connector)
{
	if (!connector->kdev)
		return;

	if (connector->ddc)
		sysfs_remove_link(&connector->kdev->kobj, "ddc");

	DRM_DEBUG("removing \"%s\" from sysfs\n",
		  connector->name);

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

void drm_sysfs_lease_event(struct drm_device *dev)
{
	char *event_string = "LEASE=1";
	char *envp[] = { event_string, NULL };

	DRM_DEBUG("generating lease event\n");

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

/**
 * 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.
 *
 * Any new uapi should be using the drm_sysfs_connector_status_event()
 * for uevents on connector status change.
 */
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);

/**
 * drm_sysfs_connector_status_event - generate a DRM uevent for connector
 * property status change
 * @connector: connector on which property status changed
 * @property: connector property whose status changed.
 *
 * Send a uevent for the DRM device specified by @dev.  Currently we
 * set HOTPLUG=1 and connector id along with the attached property id
 * related to the status change.
 */
void drm_sysfs_connector_status_event(struct drm_connector *connector,
				      struct drm_property *property)
{
	struct drm_device *dev = connector->dev;
	char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
	char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };

	WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
					   property->base.id));

	snprintf(conn_id, ARRAY_SIZE(conn_id),
		 "CONNECTOR=%u", connector->base.id);
	snprintf(prop_id, ARRAY_SIZE(prop_id),
		 "PROPERTY=%u", property->base.id);

	DRM_DEBUG("generating connector status event\n");

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

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

struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
{
	const char *minor_str;
	struct device *kdev;
	int r;

	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 new device with the DRM sysfs class
 * @dev: device to register
 *
 * Registers a new &struct device within the DRM sysfs class. Essentially only
 * used by ttm to have a place for its global settings. Drivers should never use
 * this.
 */
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);

/**
 * drm_class_device_unregister - unregister device with the DRM sysfs class
 * @dev: device to unregister
 *
 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
 * by ttm to have a place for its global settings. Drivers should never use
 * this.
 */
void drm_class_device_unregister(struct device *dev)
{
	return device_unregister(dev);
}
EXPORT_SYMBOL_GPL(drm_class_device_unregister);