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1
2/*
3 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
4 * extra sysfs attribute from DRM. Normal drm_sysfs_class
5 * does not allow adding attributes.
6 *
7 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
8 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
9 * Copyright (c) 2003-2004 IBM Corp.
10 *
11 * This file is released under the GPLv2
12 *
13 */
14
15#include <linux/device.h>
16#include <linux/kdev_t.h>
17#include <linux/gfp.h>
18#include <linux/err.h>
19
20#include "drm_sysfs.h"
21#include "drm_core.h"
22#include "drmP.h"
23
24#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
25#define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
26
27static struct device_type drm_sysfs_device_minor = {
28 .name = "drm_minor"
29};
30
31/**
32 * drm_class_suspend - DRM class suspend hook
33 * @dev: Linux device to suspend
34 * @state: power state to enter
35 *
36 * Just figures out what the actual struct drm_device associated with
37 * @dev is and calls its suspend hook, if present.
38 */
39static int drm_class_suspend(struct device *dev, pm_message_t state)
40{
41 if (dev->type == &drm_sysfs_device_minor) {
42 struct drm_minor *drm_minor = to_drm_minor(dev);
43 struct drm_device *drm_dev = drm_minor->dev;
44
45 if (drm_minor->type == DRM_MINOR_LEGACY &&
46 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
47 drm_dev->driver->suspend)
48 return drm_dev->driver->suspend(drm_dev, state);
49 }
50 return 0;
51}
52
53/**
54 * drm_class_resume - DRM class resume hook
55 * @dev: Linux device to resume
56 *
57 * Just figures out what the actual struct drm_device associated with
58 * @dev is and calls its resume hook, if present.
59 */
60static int drm_class_resume(struct device *dev)
61{
62 if (dev->type == &drm_sysfs_device_minor) {
63 struct drm_minor *drm_minor = to_drm_minor(dev);
64 struct drm_device *drm_dev = drm_minor->dev;
65
66 if (drm_minor->type == DRM_MINOR_LEGACY &&
67 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
68 drm_dev->driver->resume)
69 return drm_dev->driver->resume(drm_dev);
70 }
71 return 0;
72}
73
74static char *drm_devnode(struct device *dev, mode_t *mode)
75{
76 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
77}
78
79static CLASS_ATTR_STRING(version, S_IRUGO,
80 CORE_NAME " "
81 __stringify(CORE_MAJOR) "."
82 __stringify(CORE_MINOR) "."
83 __stringify(CORE_PATCHLEVEL) " "
84 CORE_DATE);
85
86/**
87 * drm_sysfs_create - create a struct drm_sysfs_class structure
88 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
89 * @name: pointer to a string for the name of this class.
90 *
91 * This is used to create DRM class pointer that can then be used
92 * in calls to drm_sysfs_device_add().
93 *
94 * Note, the pointer created here is to be destroyed when finished by making a
95 * call to drm_sysfs_destroy().
96 */
97struct class *drm_sysfs_create(struct module *owner, char *name)
98{
99 struct class *class;
100 int err;
101
102 class = class_create(owner, name);
103 if (IS_ERR(class)) {
104 err = PTR_ERR(class);
105 goto err_out;
106 }
107
108 class->suspend = drm_class_suspend;
109 class->resume = drm_class_resume;
110
111 err = class_create_file(class, &class_attr_version.attr);
112 if (err)
113 goto err_out_class;
114
115 class->devnode = drm_devnode;
116
117 return class;
118
119err_out_class:
120 class_destroy(class);
121err_out:
122 return ERR_PTR(err);
123}
124
125/**
126 * drm_sysfs_destroy - destroys DRM class
127 *
128 * Destroy the DRM device class.
129 */
130void drm_sysfs_destroy(void)
131{
132 if ((drm_class == NULL) || (IS_ERR(drm_class)))
133 return;
134 class_remove_file(drm_class, &class_attr_version.attr);
135 class_destroy(drm_class);
136}
137
138/**
139 * drm_sysfs_device_release - do nothing
140 * @dev: Linux device
141 *
142 * Normally, this would free the DRM device associated with @dev, along
143 * with cleaning up any other stuff. But we do that in the DRM core, so
144 * this function can just return and hope that the core does its job.
145 */
146static void drm_sysfs_device_release(struct device *dev)
147{
148 memset(dev, 0, sizeof(struct device));
149 return;
150}
151
152/*
153 * Connector properties
154 */
155static ssize_t status_show(struct device *device,
156 struct device_attribute *attr,
157 char *buf)
158{
159 struct drm_connector *connector = to_drm_connector(device);
160 enum drm_connector_status status;
161 int ret;
162
163 ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
164 if (ret)
165 return ret;
166
167 status = connector->funcs->detect(connector, true);
168 mutex_unlock(&connector->dev->mode_config.mutex);
169
170 return snprintf(buf, PAGE_SIZE, "%s\n",
171 drm_get_connector_status_name(status));
172}
173
174static ssize_t dpms_show(struct device *device,
175 struct device_attribute *attr,
176 char *buf)
177{
178 struct drm_connector *connector = to_drm_connector(device);
179 struct drm_device *dev = connector->dev;
180 uint64_t dpms_status;
181 int ret;
182
183 ret = drm_connector_property_get_value(connector,
184 dev->mode_config.dpms_property,
185 &dpms_status);
186 if (ret)
187 return 0;
188
189 return snprintf(buf, PAGE_SIZE, "%s\n",
190 drm_get_dpms_name((int)dpms_status));
191}
192
193static ssize_t enabled_show(struct device *device,
194 struct device_attribute *attr,
195 char *buf)
196{
197 struct drm_connector *connector = to_drm_connector(device);
198
199 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
200 "disabled");
201}
202
203static ssize_t edid_show(struct file *filp, struct kobject *kobj,
204 struct bin_attribute *attr, char *buf, loff_t off,
205 size_t count)
206{
207 struct device *connector_dev = container_of(kobj, struct device, kobj);
208 struct drm_connector *connector = to_drm_connector(connector_dev);
209 unsigned char *edid;
210 size_t size;
211
212 if (!connector->edid_blob_ptr)
213 return 0;
214
215 edid = connector->edid_blob_ptr->data;
216 size = connector->edid_blob_ptr->length;
217 if (!edid)
218 return 0;
219
220 if (off >= size)
221 return 0;
222
223 if (off + count > size)
224 count = size - off;
225 memcpy(buf, edid + off, count);
226
227 return count;
228}
229
230static ssize_t modes_show(struct device *device,
231 struct device_attribute *attr,
232 char *buf)
233{
234 struct drm_connector *connector = to_drm_connector(device);
235 struct drm_display_mode *mode;
236 int written = 0;
237
238 list_for_each_entry(mode, &connector->modes, head) {
239 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
240 mode->name);
241 }
242
243 return written;
244}
245
246static ssize_t subconnector_show(struct device *device,
247 struct device_attribute *attr,
248 char *buf)
249{
250 struct drm_connector *connector = to_drm_connector(device);
251 struct drm_device *dev = connector->dev;
252 struct drm_property *prop = NULL;
253 uint64_t subconnector;
254 int is_tv = 0;
255 int ret;
256
257 switch (connector->connector_type) {
258 case DRM_MODE_CONNECTOR_DVII:
259 prop = dev->mode_config.dvi_i_subconnector_property;
260 break;
261 case DRM_MODE_CONNECTOR_Composite:
262 case DRM_MODE_CONNECTOR_SVIDEO:
263 case DRM_MODE_CONNECTOR_Component:
264 case DRM_MODE_CONNECTOR_TV:
265 prop = dev->mode_config.tv_subconnector_property;
266 is_tv = 1;
267 break;
268 default:
269 DRM_ERROR("Wrong connector type for this property\n");
270 return 0;
271 }
272
273 if (!prop) {
274 DRM_ERROR("Unable to find subconnector property\n");
275 return 0;
276 }
277
278 ret = drm_connector_property_get_value(connector, prop, &subconnector);
279 if (ret)
280 return 0;
281
282 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
283 drm_get_tv_subconnector_name((int)subconnector) :
284 drm_get_dvi_i_subconnector_name((int)subconnector));
285}
286
287static ssize_t select_subconnector_show(struct device *device,
288 struct device_attribute *attr,
289 char *buf)
290{
291 struct drm_connector *connector = to_drm_connector(device);
292 struct drm_device *dev = connector->dev;
293 struct drm_property *prop = NULL;
294 uint64_t subconnector;
295 int is_tv = 0;
296 int ret;
297
298 switch (connector->connector_type) {
299 case DRM_MODE_CONNECTOR_DVII:
300 prop = dev->mode_config.dvi_i_select_subconnector_property;
301 break;
302 case DRM_MODE_CONNECTOR_Composite:
303 case DRM_MODE_CONNECTOR_SVIDEO:
304 case DRM_MODE_CONNECTOR_Component:
305 case DRM_MODE_CONNECTOR_TV:
306 prop = dev->mode_config.tv_select_subconnector_property;
307 is_tv = 1;
308 break;
309 default:
310 DRM_ERROR("Wrong connector type for this property\n");
311 return 0;
312 }
313
314 if (!prop) {
315 DRM_ERROR("Unable to find select subconnector property\n");
316 return 0;
317 }
318
319 ret = drm_connector_property_get_value(connector, prop, &subconnector);
320 if (ret)
321 return 0;
322
323 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
324 drm_get_tv_select_name((int)subconnector) :
325 drm_get_dvi_i_select_name((int)subconnector));
326}
327
328static struct device_attribute connector_attrs[] = {
329 __ATTR_RO(status),
330 __ATTR_RO(enabled),
331 __ATTR_RO(dpms),
332 __ATTR_RO(modes),
333};
334
335/* These attributes are for both DVI-I connectors and all types of tv-out. */
336static struct device_attribute connector_attrs_opt1[] = {
337 __ATTR_RO(subconnector),
338 __ATTR_RO(select_subconnector),
339};
340
341static struct bin_attribute edid_attr = {
342 .attr.name = "edid",
343 .attr.mode = 0444,
344 .size = 0,
345 .read = edid_show,
346};
347
348/**
349 * drm_sysfs_connector_add - add an connector to sysfs
350 * @connector: connector to add
351 *
352 * Create an connector device in sysfs, along with its associated connector
353 * properties (so far, connection status, dpms, mode list & edid) and
354 * generate a hotplug event so userspace knows there's a new connector
355 * available.
356 *
357 * Note:
358 * This routine should only be called *once* for each DRM minor registered.
359 * A second call for an already registered device will trigger the BUG_ON
360 * below.
361 */
362int drm_sysfs_connector_add(struct drm_connector *connector)
363{
364 struct drm_device *dev = connector->dev;
365 int attr_cnt = 0;
366 int opt_cnt = 0;
367 int i;
368 int ret = 0;
369
370 /* We shouldn't get called more than once for the same connector */
371 BUG_ON(device_is_registered(&connector->kdev));
372
373 connector->kdev.parent = &dev->primary->kdev;
374 connector->kdev.class = drm_class;
375 connector->kdev.release = drm_sysfs_device_release;
376
377 DRM_DEBUG("adding \"%s\" to sysfs\n",
378 drm_get_connector_name(connector));
379
380 dev_set_name(&connector->kdev, "card%d-%s",
381 dev->primary->index, drm_get_connector_name(connector));
382 ret = device_register(&connector->kdev);
383
384 if (ret) {
385 DRM_ERROR("failed to register connector device: %d\n", ret);
386 goto out;
387 }
388
389 /* Standard attributes */
390
391 for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
392 ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]);
393 if (ret)
394 goto err_out_files;
395 }
396
397 /* Optional attributes */
398 /*
399 * In the long run it maybe a good idea to make one set of
400 * optionals per connector type.
401 */
402 switch (connector->connector_type) {
403 case DRM_MODE_CONNECTOR_DVII:
404 case DRM_MODE_CONNECTOR_Composite:
405 case DRM_MODE_CONNECTOR_SVIDEO:
406 case DRM_MODE_CONNECTOR_Component:
407 case DRM_MODE_CONNECTOR_TV:
408 for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
409 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[opt_cnt]);
410 if (ret)
411 goto err_out_files;
412 }
413 break;
414 default:
415 break;
416 }
417
418 ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
419 if (ret)
420 goto err_out_files;
421
422 /* Let userspace know we have a new connector */
423 drm_sysfs_hotplug_event(dev);
424
425 return 0;
426
427err_out_files:
428 for (i = 0; i < opt_cnt; i++)
429 device_remove_file(&connector->kdev, &connector_attrs_opt1[i]);
430 for (i = 0; i < attr_cnt; i++)
431 device_remove_file(&connector->kdev, &connector_attrs[i]);
432 device_unregister(&connector->kdev);
433
434out:
435 return ret;
436}
437EXPORT_SYMBOL(drm_sysfs_connector_add);
438
439/**
440 * drm_sysfs_connector_remove - remove an connector device from sysfs
441 * @connector: connector to remove
442 *
443 * Remove @connector and its associated attributes from sysfs. Note that
444 * the device model core will take care of sending the "remove" uevent
445 * at this time, so we don't need to do it.
446 *
447 * Note:
448 * This routine should only be called if the connector was previously
449 * successfully registered. If @connector hasn't been registered yet,
450 * you'll likely see a panic somewhere deep in sysfs code when called.
451 */
452void drm_sysfs_connector_remove(struct drm_connector *connector)
453{
454 int i;
455
456 DRM_DEBUG("removing \"%s\" from sysfs\n",
457 drm_get_connector_name(connector));
458
459 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
460 device_remove_file(&connector->kdev, &connector_attrs[i]);
461 sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
462 device_unregister(&connector->kdev);
463}
464EXPORT_SYMBOL(drm_sysfs_connector_remove);
465
466/**
467 * drm_sysfs_hotplug_event - generate a DRM uevent
468 * @dev: DRM device
469 *
470 * Send a uevent for the DRM device specified by @dev. Currently we only
471 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
472 * deal with other types of events.
473 */
474void drm_sysfs_hotplug_event(struct drm_device *dev)
475{
476 char *event_string = "HOTPLUG=1";
477 char *envp[] = { event_string, NULL };
478
479 DRM_DEBUG("generating hotplug event\n");
480
481 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
482}
483EXPORT_SYMBOL(drm_sysfs_hotplug_event);
484
485/**
486 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
487 * @dev: DRM device to be added
488 * @head: DRM head in question
489 *
490 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
491 * as the parent for the Linux device, and make sure it has a file containing
492 * the driver we're using (for userspace compatibility).
493 */
494int drm_sysfs_device_add(struct drm_minor *minor)
495{
496 int err;
497 char *minor_str;
498
499 minor->kdev.parent = minor->dev->dev;
500
501 minor->kdev.class = drm_class;
502 minor->kdev.release = drm_sysfs_device_release;
503 minor->kdev.devt = minor->device;
504 minor->kdev.type = &drm_sysfs_device_minor;
505 if (minor->type == DRM_MINOR_CONTROL)
506 minor_str = "controlD%d";
507 else if (minor->type == DRM_MINOR_RENDER)
508 minor_str = "renderD%d";
509 else
510 minor_str = "card%d";
511
512 dev_set_name(&minor->kdev, minor_str, minor->index);
513
514 err = device_register(&minor->kdev);
515 if (err) {
516 DRM_ERROR("device add failed: %d\n", err);
517 goto err_out;
518 }
519
520 return 0;
521
522err_out:
523 return err;
524}
525
526/**
527 * drm_sysfs_device_remove - remove DRM device
528 * @dev: DRM device to remove
529 *
530 * This call unregisters and cleans up a class device that was created with a
531 * call to drm_sysfs_device_add()
532 */
533void drm_sysfs_device_remove(struct drm_minor *minor)
534{
535 device_unregister(&minor->kdev);
536}
537
538
539/**
540 * drm_class_device_register - Register a struct device in the drm class.
541 *
542 * @dev: pointer to struct device to register.
543 *
544 * @dev should have all relevant members pre-filled with the exception
545 * of the class member. In particular, the device_type member must
546 * be set.
547 */
548
549int drm_class_device_register(struct device *dev)
550{
551 dev->class = drm_class;
552 return device_register(dev);
553}
554EXPORT_SYMBOL_GPL(drm_class_device_register);
555
556void drm_class_device_unregister(struct device *dev)
557{
558 return device_unregister(dev);
559}
560EXPORT_SYMBOL_GPL(drm_class_device_unregister);
1
2/*
3 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
4 * extra sysfs attribute from DRM. Normal drm_sysfs_class
5 * does not allow adding attributes.
6 *
7 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
8 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
9 * Copyright (c) 2003-2004 IBM Corp.
10 *
11 * This file is released under the GPLv2
12 *
13 */
14
15#include <linux/device.h>
16#include <linux/kdev_t.h>
17#include <linux/gfp.h>
18#include <linux/err.h>
19#include <linux/export.h>
20
21#include <drm/drm_sysfs.h>
22#include <drm/drmP.h>
23#include "drm_internal.h"
24
25#define to_drm_minor(d) dev_get_drvdata(d)
26#define to_drm_connector(d) dev_get_drvdata(d)
27
28static struct device_type drm_sysfs_device_minor = {
29 .name = "drm_minor"
30};
31
32struct class *drm_class;
33
34static char *drm_devnode(struct device *dev, umode_t *mode)
35{
36 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
37}
38
39static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
40
41/**
42 * drm_sysfs_init - initialize sysfs helpers
43 *
44 * This is used to create the DRM class, which is the implicit parent of any
45 * other top-level DRM sysfs objects.
46 *
47 * You must call drm_sysfs_destroy() to release the allocated resources.
48 *
49 * Return: 0 on success, negative error code on failure.
50 */
51int drm_sysfs_init(void)
52{
53 int err;
54
55 drm_class = class_create(THIS_MODULE, "drm");
56 if (IS_ERR(drm_class))
57 return PTR_ERR(drm_class);
58
59 err = class_create_file(drm_class, &class_attr_version.attr);
60 if (err) {
61 class_destroy(drm_class);
62 drm_class = NULL;
63 return err;
64 }
65
66 drm_class->devnode = drm_devnode;
67 return 0;
68}
69
70/**
71 * drm_sysfs_destroy - destroys DRM class
72 *
73 * Destroy the DRM device class.
74 */
75void drm_sysfs_destroy(void)
76{
77 if (IS_ERR_OR_NULL(drm_class))
78 return;
79 class_remove_file(drm_class, &class_attr_version.attr);
80 class_destroy(drm_class);
81 drm_class = NULL;
82}
83
84/*
85 * Connector properties
86 */
87static ssize_t status_store(struct device *device,
88 struct device_attribute *attr,
89 const char *buf, size_t count)
90{
91 struct drm_connector *connector = to_drm_connector(device);
92 struct drm_device *dev = connector->dev;
93 enum drm_connector_force old_force;
94 int ret;
95
96 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
97 if (ret)
98 return ret;
99
100 old_force = connector->force;
101
102 if (sysfs_streq(buf, "detect"))
103 connector->force = 0;
104 else if (sysfs_streq(buf, "on"))
105 connector->force = DRM_FORCE_ON;
106 else if (sysfs_streq(buf, "on-digital"))
107 connector->force = DRM_FORCE_ON_DIGITAL;
108 else if (sysfs_streq(buf, "off"))
109 connector->force = DRM_FORCE_OFF;
110 else
111 ret = -EINVAL;
112
113 if (old_force != connector->force || !connector->force) {
114 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
115 connector->base.id,
116 connector->name,
117 old_force, connector->force);
118
119 connector->funcs->fill_modes(connector,
120 dev->mode_config.max_width,
121 dev->mode_config.max_height);
122 }
123
124 mutex_unlock(&dev->mode_config.mutex);
125
126 return ret ? ret : count;
127}
128
129static ssize_t status_show(struct device *device,
130 struct device_attribute *attr,
131 char *buf)
132{
133 struct drm_connector *connector = to_drm_connector(device);
134 enum drm_connector_status status;
135
136 status = READ_ONCE(connector->status);
137
138 return snprintf(buf, PAGE_SIZE, "%s\n",
139 drm_get_connector_status_name(status));
140}
141
142static ssize_t dpms_show(struct device *device,
143 struct device_attribute *attr,
144 char *buf)
145{
146 struct drm_connector *connector = to_drm_connector(device);
147 int dpms;
148
149 dpms = READ_ONCE(connector->dpms);
150
151 return snprintf(buf, PAGE_SIZE, "%s\n",
152 drm_get_dpms_name(dpms));
153}
154
155static ssize_t enabled_show(struct device *device,
156 struct device_attribute *attr,
157 char *buf)
158{
159 struct drm_connector *connector = to_drm_connector(device);
160 bool enabled;
161
162 enabled = READ_ONCE(connector->encoder);
163
164 return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
165}
166
167static ssize_t edid_show(struct file *filp, struct kobject *kobj,
168 struct bin_attribute *attr, char *buf, loff_t off,
169 size_t count)
170{
171 struct device *connector_dev = kobj_to_dev(kobj);
172 struct drm_connector *connector = to_drm_connector(connector_dev);
173 unsigned char *edid;
174 size_t size;
175 ssize_t ret = 0;
176
177 mutex_lock(&connector->dev->mode_config.mutex);
178 if (!connector->edid_blob_ptr)
179 goto unlock;
180
181 edid = connector->edid_blob_ptr->data;
182 size = connector->edid_blob_ptr->length;
183 if (!edid)
184 goto unlock;
185
186 if (off >= size)
187 goto unlock;
188
189 if (off + count > size)
190 count = size - off;
191 memcpy(buf, edid + off, count);
192
193 ret = count;
194unlock:
195 mutex_unlock(&connector->dev->mode_config.mutex);
196
197 return ret;
198}
199
200static ssize_t modes_show(struct device *device,
201 struct device_attribute *attr,
202 char *buf)
203{
204 struct drm_connector *connector = to_drm_connector(device);
205 struct drm_display_mode *mode;
206 int written = 0;
207
208 mutex_lock(&connector->dev->mode_config.mutex);
209 list_for_each_entry(mode, &connector->modes, head) {
210 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
211 mode->name);
212 }
213 mutex_unlock(&connector->dev->mode_config.mutex);
214
215 return written;
216}
217
218static DEVICE_ATTR_RW(status);
219static DEVICE_ATTR_RO(enabled);
220static DEVICE_ATTR_RO(dpms);
221static DEVICE_ATTR_RO(modes);
222
223static struct attribute *connector_dev_attrs[] = {
224 &dev_attr_status.attr,
225 &dev_attr_enabled.attr,
226 &dev_attr_dpms.attr,
227 &dev_attr_modes.attr,
228 NULL
229};
230
231static struct bin_attribute edid_attr = {
232 .attr.name = "edid",
233 .attr.mode = 0444,
234 .size = 0,
235 .read = edid_show,
236};
237
238static struct bin_attribute *connector_bin_attrs[] = {
239 &edid_attr,
240 NULL
241};
242
243static const struct attribute_group connector_dev_group = {
244 .attrs = connector_dev_attrs,
245 .bin_attrs = connector_bin_attrs,
246};
247
248static const struct attribute_group *connector_dev_groups[] = {
249 &connector_dev_group,
250 NULL
251};
252
253/**
254 * drm_sysfs_connector_add - add a connector to sysfs
255 * @connector: connector to add
256 *
257 * Create a connector device in sysfs, along with its associated connector
258 * properties (so far, connection status, dpms, mode list & edid) and
259 * generate a hotplug event so userspace knows there's a new connector
260 * available.
261 */
262int drm_sysfs_connector_add(struct drm_connector *connector)
263{
264 struct drm_device *dev = connector->dev;
265
266 if (connector->kdev)
267 return 0;
268
269 connector->kdev =
270 device_create_with_groups(drm_class, dev->primary->kdev, 0,
271 connector, connector_dev_groups,
272 "card%d-%s", dev->primary->index,
273 connector->name);
274 DRM_DEBUG("adding \"%s\" to sysfs\n",
275 connector->name);
276
277 if (IS_ERR(connector->kdev)) {
278 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
279 return PTR_ERR(connector->kdev);
280 }
281
282 /* Let userspace know we have a new connector */
283 drm_sysfs_hotplug_event(dev);
284
285 return 0;
286}
287
288/**
289 * drm_sysfs_connector_remove - remove an connector device from sysfs
290 * @connector: connector to remove
291 *
292 * Remove @connector and its associated attributes from sysfs. Note that
293 * the device model core will take care of sending the "remove" uevent
294 * at this time, so we don't need to do it.
295 *
296 * Note:
297 * This routine should only be called if the connector was previously
298 * successfully registered. If @connector hasn't been registered yet,
299 * you'll likely see a panic somewhere deep in sysfs code when called.
300 */
301void drm_sysfs_connector_remove(struct drm_connector *connector)
302{
303 if (!connector->kdev)
304 return;
305 DRM_DEBUG("removing \"%s\" from sysfs\n",
306 connector->name);
307
308 device_unregister(connector->kdev);
309 connector->kdev = NULL;
310}
311
312/**
313 * drm_sysfs_hotplug_event - generate a DRM uevent
314 * @dev: DRM device
315 *
316 * Send a uevent for the DRM device specified by @dev. Currently we only
317 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
318 * deal with other types of events.
319 */
320void drm_sysfs_hotplug_event(struct drm_device *dev)
321{
322 char *event_string = "HOTPLUG=1";
323 char *envp[] = { event_string, NULL };
324
325 DRM_DEBUG("generating hotplug event\n");
326
327 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
328}
329EXPORT_SYMBOL(drm_sysfs_hotplug_event);
330
331static void drm_sysfs_release(struct device *dev)
332{
333 kfree(dev);
334}
335
336/**
337 * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
338 * @minor: minor to allocate sysfs device for
339 *
340 * This allocates a new sysfs device for @minor and returns it. The device is
341 * not registered nor linked. The caller has to use device_add() and
342 * device_del() to register and unregister it.
343 *
344 * Note that dev_get_drvdata() on the new device will return the minor.
345 * However, the device does not hold a ref-count to the minor nor to the
346 * underlying drm_device. This is unproblematic as long as you access the
347 * private data only in sysfs callbacks. device_del() disables those
348 * synchronously, so they cannot be called after you cleanup a minor.
349 */
350struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
351{
352 const char *minor_str;
353 struct device *kdev;
354 int r;
355
356 if (minor->type == DRM_MINOR_CONTROL)
357 minor_str = "controlD%d";
358 else if (minor->type == DRM_MINOR_RENDER)
359 minor_str = "renderD%d";
360 else
361 minor_str = "card%d";
362
363 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
364 if (!kdev)
365 return ERR_PTR(-ENOMEM);
366
367 device_initialize(kdev);
368 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
369 kdev->class = drm_class;
370 kdev->type = &drm_sysfs_device_minor;
371 kdev->parent = minor->dev->dev;
372 kdev->release = drm_sysfs_release;
373 dev_set_drvdata(kdev, minor);
374
375 r = dev_set_name(kdev, minor_str, minor->index);
376 if (r < 0)
377 goto err_free;
378
379 return kdev;
380
381err_free:
382 put_device(kdev);
383 return ERR_PTR(r);
384}
385
386/**
387 * drm_class_device_register - Register a struct device in the drm class.
388 *
389 * @dev: pointer to struct device to register.
390 *
391 * @dev should have all relevant members pre-filled with the exception
392 * of the class member. In particular, the device_type member must
393 * be set.
394 */
395
396int drm_class_device_register(struct device *dev)
397{
398 if (!drm_class || IS_ERR(drm_class))
399 return -ENOENT;
400
401 dev->class = drm_class;
402 return device_register(dev);
403}
404EXPORT_SYMBOL_GPL(drm_class_device_register);
405
406void drm_class_device_unregister(struct device *dev)
407{
408 return device_unregister(dev);
409}
410EXPORT_SYMBOL_GPL(drm_class_device_unregister);