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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#include <linux/export.h>
20
21#include <drm/drm_sysfs.h>
22#include <drm/drm_core.h>
23#include <drm/drmP.h>
24#include "drm_internal.h"
25
26#define to_drm_minor(d) dev_get_drvdata(d)
27#define to_drm_connector(d) dev_get_drvdata(d)
28
29static struct device_type drm_sysfs_device_minor = {
30 .name = "drm_minor"
31};
32
33struct class *drm_class;
34
35/**
36 * __drm_class_suspend - internal DRM class suspend routine
37 * @dev: Linux device to suspend
38 * @state: power state to enter
39 *
40 * Just figures out what the actual struct drm_device associated with
41 * @dev is and calls its suspend hook, if present.
42 */
43static int __drm_class_suspend(struct device *dev, pm_message_t state)
44{
45 if (dev->type == &drm_sysfs_device_minor) {
46 struct drm_minor *drm_minor = to_drm_minor(dev);
47 struct drm_device *drm_dev = drm_minor->dev;
48
49 if (drm_minor->type == DRM_MINOR_LEGACY &&
50 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
51 drm_dev->driver->suspend)
52 return drm_dev->driver->suspend(drm_dev, state);
53 }
54 return 0;
55}
56
57/**
58 * drm_class_suspend - internal DRM class suspend hook. Simply calls
59 * __drm_class_suspend() with the correct pm state.
60 * @dev: Linux device to suspend
61 */
62static int drm_class_suspend(struct device *dev)
63{
64 return __drm_class_suspend(dev, PMSG_SUSPEND);
65}
66
67/**
68 * drm_class_freeze - internal DRM class freeze hook. Simply calls
69 * __drm_class_suspend() with the correct pm state.
70 * @dev: Linux device to freeze
71 */
72static int drm_class_freeze(struct device *dev)
73{
74 return __drm_class_suspend(dev, PMSG_FREEZE);
75}
76
77/**
78 * drm_class_resume - DRM class resume hook
79 * @dev: Linux device to resume
80 *
81 * Just figures out what the actual struct drm_device associated with
82 * @dev is and calls its resume hook, if present.
83 */
84static int drm_class_resume(struct device *dev)
85{
86 if (dev->type == &drm_sysfs_device_minor) {
87 struct drm_minor *drm_minor = to_drm_minor(dev);
88 struct drm_device *drm_dev = drm_minor->dev;
89
90 if (drm_minor->type == DRM_MINOR_LEGACY &&
91 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
92 drm_dev->driver->resume)
93 return drm_dev->driver->resume(drm_dev);
94 }
95 return 0;
96}
97
98static const struct dev_pm_ops drm_class_dev_pm_ops = {
99 .suspend = drm_class_suspend,
100 .resume = drm_class_resume,
101 .freeze = drm_class_freeze,
102};
103
104static char *drm_devnode(struct device *dev, umode_t *mode)
105{
106 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
107}
108
109static CLASS_ATTR_STRING(version, S_IRUGO,
110 CORE_NAME " "
111 __stringify(CORE_MAJOR) "."
112 __stringify(CORE_MINOR) "."
113 __stringify(CORE_PATCHLEVEL) " "
114 CORE_DATE);
115
116/**
117 * drm_sysfs_init - initialize sysfs helpers
118 *
119 * This is used to create the DRM class, which is the implicit parent of any
120 * other top-level DRM sysfs objects.
121 *
122 * You must call drm_sysfs_destroy() to release the allocated resources.
123 *
124 * Return: 0 on success, negative error code on failure.
125 */
126int drm_sysfs_init(void)
127{
128 int err;
129
130 drm_class = class_create(THIS_MODULE, "drm");
131 if (IS_ERR(drm_class))
132 return PTR_ERR(drm_class);
133
134 drm_class->pm = &drm_class_dev_pm_ops;
135
136 err = class_create_file(drm_class, &class_attr_version.attr);
137 if (err) {
138 class_destroy(drm_class);
139 drm_class = NULL;
140 return err;
141 }
142
143 drm_class->devnode = drm_devnode;
144 return 0;
145}
146
147/**
148 * drm_sysfs_destroy - destroys DRM class
149 *
150 * Destroy the DRM device class.
151 */
152void drm_sysfs_destroy(void)
153{
154 if (IS_ERR_OR_NULL(drm_class))
155 return;
156 class_remove_file(drm_class, &class_attr_version.attr);
157 class_destroy(drm_class);
158 drm_class = NULL;
159}
160
161/*
162 * Connector properties
163 */
164static ssize_t status_store(struct device *device,
165 struct device_attribute *attr,
166 const char *buf, size_t count)
167{
168 struct drm_connector *connector = to_drm_connector(device);
169 struct drm_device *dev = connector->dev;
170 enum drm_connector_force old_force;
171 int ret;
172
173 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
174 if (ret)
175 return ret;
176
177 old_force = connector->force;
178
179 if (sysfs_streq(buf, "detect"))
180 connector->force = 0;
181 else if (sysfs_streq(buf, "on"))
182 connector->force = DRM_FORCE_ON;
183 else if (sysfs_streq(buf, "on-digital"))
184 connector->force = DRM_FORCE_ON_DIGITAL;
185 else if (sysfs_streq(buf, "off"))
186 connector->force = DRM_FORCE_OFF;
187 else
188 ret = -EINVAL;
189
190 if (old_force != connector->force || !connector->force) {
191 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
192 connector->base.id,
193 connector->name,
194 old_force, connector->force);
195
196 connector->funcs->fill_modes(connector,
197 dev->mode_config.max_width,
198 dev->mode_config.max_height);
199 }
200
201 mutex_unlock(&dev->mode_config.mutex);
202
203 return ret ? ret : count;
204}
205
206static ssize_t status_show(struct device *device,
207 struct device_attribute *attr,
208 char *buf)
209{
210 struct drm_connector *connector = to_drm_connector(device);
211
212 return snprintf(buf, PAGE_SIZE, "%s\n",
213 drm_get_connector_status_name(connector->status));
214}
215
216static ssize_t dpms_show(struct device *device,
217 struct device_attribute *attr,
218 char *buf)
219{
220 struct drm_connector *connector = to_drm_connector(device);
221 int dpms;
222
223 dpms = READ_ONCE(connector->dpms);
224
225 return snprintf(buf, PAGE_SIZE, "%s\n",
226 drm_get_dpms_name(dpms));
227}
228
229static ssize_t enabled_show(struct device *device,
230 struct device_attribute *attr,
231 char *buf)
232{
233 struct drm_connector *connector = to_drm_connector(device);
234
235 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
236 "disabled");
237}
238
239static ssize_t edid_show(struct file *filp, struct kobject *kobj,
240 struct bin_attribute *attr, char *buf, loff_t off,
241 size_t count)
242{
243 struct device *connector_dev = kobj_to_dev(kobj);
244 struct drm_connector *connector = to_drm_connector(connector_dev);
245 unsigned char *edid;
246 size_t size;
247 ssize_t ret = 0;
248
249 mutex_lock(&connector->dev->mode_config.mutex);
250 if (!connector->edid_blob_ptr)
251 goto unlock;
252
253 edid = connector->edid_blob_ptr->data;
254 size = connector->edid_blob_ptr->length;
255 if (!edid)
256 goto unlock;
257
258 if (off >= size)
259 goto unlock;
260
261 if (off + count > size)
262 count = size - off;
263 memcpy(buf, edid + off, count);
264
265 ret = count;
266unlock:
267 mutex_unlock(&connector->dev->mode_config.mutex);
268
269 return ret;
270}
271
272static ssize_t modes_show(struct device *device,
273 struct device_attribute *attr,
274 char *buf)
275{
276 struct drm_connector *connector = to_drm_connector(device);
277 struct drm_display_mode *mode;
278 int written = 0;
279
280 mutex_lock(&connector->dev->mode_config.mutex);
281 list_for_each_entry(mode, &connector->modes, head) {
282 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
283 mode->name);
284 }
285 mutex_unlock(&connector->dev->mode_config.mutex);
286
287 return written;
288}
289
290static ssize_t tv_subconnector_show(struct device *device,
291 struct device_attribute *attr,
292 char *buf)
293{
294 struct drm_connector *connector = to_drm_connector(device);
295 struct drm_device *dev = connector->dev;
296 struct drm_property *prop;
297 uint64_t subconnector;
298 int ret;
299
300 prop = dev->mode_config.tv_subconnector_property;
301 if (!prop) {
302 DRM_ERROR("Unable to find subconnector property\n");
303 return 0;
304 }
305
306 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
307 if (ret)
308 return 0;
309
310 return snprintf(buf, PAGE_SIZE, "%s",
311 drm_get_tv_subconnector_name((int)subconnector));
312}
313
314static ssize_t tv_select_subconnector_show(struct device *device,
315 struct device_attribute *attr,
316 char *buf)
317{
318 struct drm_connector *connector = to_drm_connector(device);
319 struct drm_device *dev = connector->dev;
320 struct drm_property *prop;
321 uint64_t subconnector;
322 int ret;
323
324 prop = dev->mode_config.tv_select_subconnector_property;
325 if (!prop) {
326 DRM_ERROR("Unable to find select subconnector property\n");
327 return 0;
328 }
329
330 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
331 if (ret)
332 return 0;
333
334 return snprintf(buf, PAGE_SIZE, "%s",
335 drm_get_tv_select_name((int)subconnector));
336}
337
338static ssize_t dvii_subconnector_show(struct device *device,
339 struct device_attribute *attr,
340 char *buf)
341{
342 struct drm_connector *connector = to_drm_connector(device);
343 struct drm_device *dev = connector->dev;
344 struct drm_property *prop;
345 uint64_t subconnector;
346 int ret;
347
348 prop = dev->mode_config.dvi_i_subconnector_property;
349 if (!prop) {
350 DRM_ERROR("Unable to find subconnector property\n");
351 return 0;
352 }
353
354 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
355 if (ret)
356 return 0;
357
358 return snprintf(buf, PAGE_SIZE, "%s",
359 drm_get_dvi_i_subconnector_name((int)subconnector));
360}
361
362static ssize_t dvii_select_subconnector_show(struct device *device,
363 struct device_attribute *attr,
364 char *buf)
365{
366 struct drm_connector *connector = to_drm_connector(device);
367 struct drm_device *dev = connector->dev;
368 struct drm_property *prop;
369 uint64_t subconnector;
370 int ret;
371
372 prop = dev->mode_config.dvi_i_select_subconnector_property;
373 if (!prop) {
374 DRM_ERROR("Unable to find select subconnector property\n");
375 return 0;
376 }
377
378 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
379 if (ret)
380 return 0;
381
382 return snprintf(buf, PAGE_SIZE, "%s",
383 drm_get_dvi_i_select_name((int)subconnector));
384}
385
386static DEVICE_ATTR_RW(status);
387static DEVICE_ATTR_RO(enabled);
388static DEVICE_ATTR_RO(dpms);
389static DEVICE_ATTR_RO(modes);
390
391static struct attribute *connector_dev_attrs[] = {
392 &dev_attr_status.attr,
393 &dev_attr_enabled.attr,
394 &dev_attr_dpms.attr,
395 &dev_attr_modes.attr,
396 NULL
397};
398
399static DEVICE_ATTR_RO(tv_subconnector);
400static DEVICE_ATTR_RO(tv_select_subconnector);
401
402static struct attribute *connector_tv_dev_attrs[] = {
403 &dev_attr_tv_subconnector.attr,
404 &dev_attr_tv_select_subconnector.attr,
405 NULL
406};
407
408static DEVICE_ATTR_RO(dvii_subconnector);
409static DEVICE_ATTR_RO(dvii_select_subconnector);
410
411static struct attribute *connector_dvii_dev_attrs[] = {
412 &dev_attr_dvii_subconnector.attr,
413 &dev_attr_dvii_select_subconnector.attr,
414 NULL
415};
416
417/* Connector type related helpers */
418static int kobj_connector_type(struct kobject *kobj)
419{
420 struct device *dev = kobj_to_dev(kobj);
421 struct drm_connector *connector = to_drm_connector(dev);
422
423 return connector->connector_type;
424}
425
426static umode_t connector_is_dvii(struct kobject *kobj,
427 struct attribute *attr, int idx)
428{
429 return kobj_connector_type(kobj) == DRM_MODE_CONNECTOR_DVII ?
430 attr->mode : 0;
431}
432
433static umode_t connector_is_tv(struct kobject *kobj,
434 struct attribute *attr, int idx)
435{
436 switch (kobj_connector_type(kobj)) {
437 case DRM_MODE_CONNECTOR_Composite:
438 case DRM_MODE_CONNECTOR_SVIDEO:
439 case DRM_MODE_CONNECTOR_Component:
440 case DRM_MODE_CONNECTOR_TV:
441 return attr->mode;
442 }
443
444 return 0;
445}
446
447static struct bin_attribute edid_attr = {
448 .attr.name = "edid",
449 .attr.mode = 0444,
450 .size = 0,
451 .read = edid_show,
452};
453
454static struct bin_attribute *connector_bin_attrs[] = {
455 &edid_attr,
456 NULL
457};
458
459static const struct attribute_group connector_dev_group = {
460 .attrs = connector_dev_attrs,
461 .bin_attrs = connector_bin_attrs,
462};
463
464static const struct attribute_group connector_tv_dev_group = {
465 .attrs = connector_tv_dev_attrs,
466 .is_visible = connector_is_tv,
467};
468
469static const struct attribute_group connector_dvii_dev_group = {
470 .attrs = connector_dvii_dev_attrs,
471 .is_visible = connector_is_dvii,
472};
473
474static const struct attribute_group *connector_dev_groups[] = {
475 &connector_dev_group,
476 &connector_tv_dev_group,
477 &connector_dvii_dev_group,
478 NULL
479};
480
481/**
482 * drm_sysfs_connector_add - add a connector to sysfs
483 * @connector: connector to add
484 *
485 * Create a connector device in sysfs, along with its associated connector
486 * properties (so far, connection status, dpms, mode list & edid) and
487 * generate a hotplug event so userspace knows there's a new connector
488 * available.
489 */
490int drm_sysfs_connector_add(struct drm_connector *connector)
491{
492 struct drm_device *dev = connector->dev;
493
494 if (connector->kdev)
495 return 0;
496
497 connector->kdev =
498 device_create_with_groups(drm_class, dev->primary->kdev, 0,
499 connector, connector_dev_groups,
500 "card%d-%s", dev->primary->index,
501 connector->name);
502 DRM_DEBUG("adding \"%s\" to sysfs\n",
503 connector->name);
504
505 if (IS_ERR(connector->kdev)) {
506 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
507 return PTR_ERR(connector->kdev);
508 }
509
510 /* Let userspace know we have a new connector */
511 drm_sysfs_hotplug_event(dev);
512
513 return 0;
514}
515
516/**
517 * drm_sysfs_connector_remove - remove an connector device from sysfs
518 * @connector: connector to remove
519 *
520 * Remove @connector and its associated attributes from sysfs. Note that
521 * the device model core will take care of sending the "remove" uevent
522 * at this time, so we don't need to do it.
523 *
524 * Note:
525 * This routine should only be called if the connector was previously
526 * successfully registered. If @connector hasn't been registered yet,
527 * you'll likely see a panic somewhere deep in sysfs code when called.
528 */
529void drm_sysfs_connector_remove(struct drm_connector *connector)
530{
531 if (!connector->kdev)
532 return;
533 DRM_DEBUG("removing \"%s\" from sysfs\n",
534 connector->name);
535
536 device_unregister(connector->kdev);
537 connector->kdev = NULL;
538}
539
540/**
541 * drm_sysfs_hotplug_event - generate a DRM uevent
542 * @dev: DRM device
543 *
544 * Send a uevent for the DRM device specified by @dev. Currently we only
545 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
546 * deal with other types of events.
547 */
548void drm_sysfs_hotplug_event(struct drm_device *dev)
549{
550 char *event_string = "HOTPLUG=1";
551 char *envp[] = { event_string, NULL };
552
553 DRM_DEBUG("generating hotplug event\n");
554
555 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
556}
557EXPORT_SYMBOL(drm_sysfs_hotplug_event);
558
559static void drm_sysfs_release(struct device *dev)
560{
561 kfree(dev);
562}
563
564/**
565 * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
566 * @minor: minor to allocate sysfs device for
567 *
568 * This allocates a new sysfs device for @minor and returns it. The device is
569 * not registered nor linked. The caller has to use device_add() and
570 * device_del() to register and unregister it.
571 *
572 * Note that dev_get_drvdata() on the new device will return the minor.
573 * However, the device does not hold a ref-count to the minor nor to the
574 * underlying drm_device. This is unproblematic as long as you access the
575 * private data only in sysfs callbacks. device_del() disables those
576 * synchronously, so they cannot be called after you cleanup a minor.
577 */
578struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
579{
580 const char *minor_str;
581 struct device *kdev;
582 int r;
583
584 if (minor->type == DRM_MINOR_CONTROL)
585 minor_str = "controlD%d";
586 else if (minor->type == DRM_MINOR_RENDER)
587 minor_str = "renderD%d";
588 else
589 minor_str = "card%d";
590
591 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
592 if (!kdev)
593 return ERR_PTR(-ENOMEM);
594
595 device_initialize(kdev);
596 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
597 kdev->class = drm_class;
598 kdev->type = &drm_sysfs_device_minor;
599 kdev->parent = minor->dev->dev;
600 kdev->release = drm_sysfs_release;
601 dev_set_drvdata(kdev, minor);
602
603 r = dev_set_name(kdev, minor_str, minor->index);
604 if (r < 0)
605 goto err_free;
606
607 return kdev;
608
609err_free:
610 put_device(kdev);
611 return ERR_PTR(r);
612}
613
614/**
615 * drm_class_device_register - Register a struct device in the drm class.
616 *
617 * @dev: pointer to struct device to register.
618 *
619 * @dev should have all relevant members pre-filled with the exception
620 * of the class member. In particular, the device_type member must
621 * be set.
622 */
623
624int drm_class_device_register(struct device *dev)
625{
626 if (!drm_class || IS_ERR(drm_class))
627 return -ENOENT;
628
629 dev->class = drm_class;
630 return device_register(dev);
631}
632EXPORT_SYMBOL_GPL(drm_class_device_register);
633
634void drm_class_device_unregister(struct device *dev)
635{
636 return device_unregister(dev);
637}
638EXPORT_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/drm_core.h>
23#include <drm/drmP.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
32/**
33 * __drm_class_suspend - internal DRM class suspend routine
34 * @dev: Linux device to suspend
35 * @state: power state to enter
36 *
37 * Just figures out what the actual struct drm_device associated with
38 * @dev is and calls its suspend hook, if present.
39 */
40static int __drm_class_suspend(struct device *dev, pm_message_t state)
41{
42 if (dev->type == &drm_sysfs_device_minor) {
43 struct drm_minor *drm_minor = to_drm_minor(dev);
44 struct drm_device *drm_dev = drm_minor->dev;
45
46 if (drm_minor->type == DRM_MINOR_LEGACY &&
47 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
48 drm_dev->driver->suspend)
49 return drm_dev->driver->suspend(drm_dev, state);
50 }
51 return 0;
52}
53
54/**
55 * drm_class_suspend - internal DRM class suspend hook. Simply calls
56 * __drm_class_suspend() with the correct pm state.
57 * @dev: Linux device to suspend
58 */
59static int drm_class_suspend(struct device *dev)
60{
61 return __drm_class_suspend(dev, PMSG_SUSPEND);
62}
63
64/**
65 * drm_class_freeze - internal DRM class freeze hook. Simply calls
66 * __drm_class_suspend() with the correct pm state.
67 * @dev: Linux device to freeze
68 */
69static int drm_class_freeze(struct device *dev)
70{
71 return __drm_class_suspend(dev, PMSG_FREEZE);
72}
73
74/**
75 * drm_class_resume - DRM class resume hook
76 * @dev: Linux device to resume
77 *
78 * Just figures out what the actual struct drm_device associated with
79 * @dev is and calls its resume hook, if present.
80 */
81static int drm_class_resume(struct device *dev)
82{
83 if (dev->type == &drm_sysfs_device_minor) {
84 struct drm_minor *drm_minor = to_drm_minor(dev);
85 struct drm_device *drm_dev = drm_minor->dev;
86
87 if (drm_minor->type == DRM_MINOR_LEGACY &&
88 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
89 drm_dev->driver->resume)
90 return drm_dev->driver->resume(drm_dev);
91 }
92 return 0;
93}
94
95static const struct dev_pm_ops drm_class_dev_pm_ops = {
96 .suspend = drm_class_suspend,
97 .resume = drm_class_resume,
98 .freeze = drm_class_freeze,
99};
100
101static char *drm_devnode(struct device *dev, umode_t *mode)
102{
103 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
104}
105
106static CLASS_ATTR_STRING(version, S_IRUGO,
107 CORE_NAME " "
108 __stringify(CORE_MAJOR) "."
109 __stringify(CORE_MINOR) "."
110 __stringify(CORE_PATCHLEVEL) " "
111 CORE_DATE);
112
113/**
114 * drm_sysfs_create - create a struct drm_sysfs_class structure
115 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
116 * @name: pointer to a string for the name of this class.
117 *
118 * This is used to create DRM class pointer that can then be used
119 * in calls to drm_sysfs_device_add().
120 *
121 * Note, the pointer created here is to be destroyed when finished by making a
122 * call to drm_sysfs_destroy().
123 */
124struct class *drm_sysfs_create(struct module *owner, char *name)
125{
126 struct class *class;
127 int err;
128
129 class = class_create(owner, name);
130 if (IS_ERR(class)) {
131 err = PTR_ERR(class);
132 goto err_out;
133 }
134
135 class->pm = &drm_class_dev_pm_ops;
136
137 err = class_create_file(class, &class_attr_version.attr);
138 if (err)
139 goto err_out_class;
140
141 class->devnode = drm_devnode;
142
143 return class;
144
145err_out_class:
146 class_destroy(class);
147err_out:
148 return ERR_PTR(err);
149}
150
151/**
152 * drm_sysfs_destroy - destroys DRM class
153 *
154 * Destroy the DRM device class.
155 */
156void drm_sysfs_destroy(void)
157{
158 if ((drm_class == NULL) || (IS_ERR(drm_class)))
159 return;
160 class_remove_file(drm_class, &class_attr_version.attr);
161 class_destroy(drm_class);
162 drm_class = NULL;
163}
164
165/*
166 * Connector properties
167 */
168static ssize_t status_show(struct device *device,
169 struct device_attribute *attr,
170 char *buf)
171{
172 struct drm_connector *connector = to_drm_connector(device);
173 enum drm_connector_status status;
174 int ret;
175
176 ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
177 if (ret)
178 return ret;
179
180 status = connector->funcs->detect(connector, true);
181 mutex_unlock(&connector->dev->mode_config.mutex);
182
183 return snprintf(buf, PAGE_SIZE, "%s\n",
184 drm_get_connector_status_name(status));
185}
186
187static ssize_t dpms_show(struct device *device,
188 struct device_attribute *attr,
189 char *buf)
190{
191 struct drm_connector *connector = to_drm_connector(device);
192 struct drm_device *dev = connector->dev;
193 uint64_t dpms_status;
194 int ret;
195
196 ret = drm_object_property_get_value(&connector->base,
197 dev->mode_config.dpms_property,
198 &dpms_status);
199 if (ret)
200 return 0;
201
202 return snprintf(buf, PAGE_SIZE, "%s\n",
203 drm_get_dpms_name((int)dpms_status));
204}
205
206static ssize_t enabled_show(struct device *device,
207 struct device_attribute *attr,
208 char *buf)
209{
210 struct drm_connector *connector = to_drm_connector(device);
211
212 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
213 "disabled");
214}
215
216static ssize_t edid_show(struct file *filp, struct kobject *kobj,
217 struct bin_attribute *attr, char *buf, loff_t off,
218 size_t count)
219{
220 struct device *connector_dev = container_of(kobj, struct device, kobj);
221 struct drm_connector *connector = to_drm_connector(connector_dev);
222 unsigned char *edid;
223 size_t size;
224
225 if (!connector->edid_blob_ptr)
226 return 0;
227
228 edid = connector->edid_blob_ptr->data;
229 size = connector->edid_blob_ptr->length;
230 if (!edid)
231 return 0;
232
233 if (off >= size)
234 return 0;
235
236 if (off + count > size)
237 count = size - off;
238 memcpy(buf, edid + off, count);
239
240 return count;
241}
242
243static ssize_t modes_show(struct device *device,
244 struct device_attribute *attr,
245 char *buf)
246{
247 struct drm_connector *connector = to_drm_connector(device);
248 struct drm_display_mode *mode;
249 int written = 0;
250
251 list_for_each_entry(mode, &connector->modes, head) {
252 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
253 mode->name);
254 }
255
256 return written;
257}
258
259static ssize_t subconnector_show(struct device *device,
260 struct device_attribute *attr,
261 char *buf)
262{
263 struct drm_connector *connector = to_drm_connector(device);
264 struct drm_device *dev = connector->dev;
265 struct drm_property *prop = NULL;
266 uint64_t subconnector;
267 int is_tv = 0;
268 int ret;
269
270 switch (connector->connector_type) {
271 case DRM_MODE_CONNECTOR_DVII:
272 prop = dev->mode_config.dvi_i_subconnector_property;
273 break;
274 case DRM_MODE_CONNECTOR_Composite:
275 case DRM_MODE_CONNECTOR_SVIDEO:
276 case DRM_MODE_CONNECTOR_Component:
277 case DRM_MODE_CONNECTOR_TV:
278 prop = dev->mode_config.tv_subconnector_property;
279 is_tv = 1;
280 break;
281 default:
282 DRM_ERROR("Wrong connector type for this property\n");
283 return 0;
284 }
285
286 if (!prop) {
287 DRM_ERROR("Unable to find subconnector property\n");
288 return 0;
289 }
290
291 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
292 if (ret)
293 return 0;
294
295 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
296 drm_get_tv_subconnector_name((int)subconnector) :
297 drm_get_dvi_i_subconnector_name((int)subconnector));
298}
299
300static ssize_t select_subconnector_show(struct device *device,
301 struct device_attribute *attr,
302 char *buf)
303{
304 struct drm_connector *connector = to_drm_connector(device);
305 struct drm_device *dev = connector->dev;
306 struct drm_property *prop = NULL;
307 uint64_t subconnector;
308 int is_tv = 0;
309 int ret;
310
311 switch (connector->connector_type) {
312 case DRM_MODE_CONNECTOR_DVII:
313 prop = dev->mode_config.dvi_i_select_subconnector_property;
314 break;
315 case DRM_MODE_CONNECTOR_Composite:
316 case DRM_MODE_CONNECTOR_SVIDEO:
317 case DRM_MODE_CONNECTOR_Component:
318 case DRM_MODE_CONNECTOR_TV:
319 prop = dev->mode_config.tv_select_subconnector_property;
320 is_tv = 1;
321 break;
322 default:
323 DRM_ERROR("Wrong connector type for this property\n");
324 return 0;
325 }
326
327 if (!prop) {
328 DRM_ERROR("Unable to find select subconnector property\n");
329 return 0;
330 }
331
332 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
333 if (ret)
334 return 0;
335
336 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
337 drm_get_tv_select_name((int)subconnector) :
338 drm_get_dvi_i_select_name((int)subconnector));
339}
340
341static struct device_attribute connector_attrs[] = {
342 __ATTR_RO(status),
343 __ATTR_RO(enabled),
344 __ATTR_RO(dpms),
345 __ATTR_RO(modes),
346};
347
348/* These attributes are for both DVI-I connectors and all types of tv-out. */
349static struct device_attribute connector_attrs_opt1[] = {
350 __ATTR_RO(subconnector),
351 __ATTR_RO(select_subconnector),
352};
353
354static struct bin_attribute edid_attr = {
355 .attr.name = "edid",
356 .attr.mode = 0444,
357 .size = 0,
358 .read = edid_show,
359};
360
361/**
362 * drm_sysfs_connector_add - add a connector to sysfs
363 * @connector: connector to add
364 *
365 * Create a connector device in sysfs, along with its associated connector
366 * properties (so far, connection status, dpms, mode list & edid) and
367 * generate a hotplug event so userspace knows there's a new connector
368 * available.
369 */
370int drm_sysfs_connector_add(struct drm_connector *connector)
371{
372 struct drm_device *dev = connector->dev;
373 int attr_cnt = 0;
374 int opt_cnt = 0;
375 int i;
376 int ret;
377
378 if (connector->kdev)
379 return 0;
380
381 connector->kdev = device_create(drm_class, dev->primary->kdev,
382 0, connector, "card%d-%s",
383 dev->primary->index, drm_get_connector_name(connector));
384 DRM_DEBUG("adding \"%s\" to sysfs\n",
385 drm_get_connector_name(connector));
386
387 if (IS_ERR(connector->kdev)) {
388 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
389 ret = PTR_ERR(connector->kdev);
390 goto out;
391 }
392
393 /* Standard attributes */
394
395 for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
396 ret = device_create_file(connector->kdev, &connector_attrs[attr_cnt]);
397 if (ret)
398 goto err_out_files;
399 }
400
401 /* Optional attributes */
402 /*
403 * In the long run it maybe a good idea to make one set of
404 * optionals per connector type.
405 */
406 switch (connector->connector_type) {
407 case DRM_MODE_CONNECTOR_DVII:
408 case DRM_MODE_CONNECTOR_Composite:
409 case DRM_MODE_CONNECTOR_SVIDEO:
410 case DRM_MODE_CONNECTOR_Component:
411 case DRM_MODE_CONNECTOR_TV:
412 for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
413 ret = device_create_file(connector->kdev, &connector_attrs_opt1[opt_cnt]);
414 if (ret)
415 goto err_out_files;
416 }
417 break;
418 default:
419 break;
420 }
421
422 ret = sysfs_create_bin_file(&connector->kdev->kobj, &edid_attr);
423 if (ret)
424 goto err_out_files;
425
426 /* Let userspace know we have a new connector */
427 drm_sysfs_hotplug_event(dev);
428
429 return 0;
430
431err_out_files:
432 for (i = 0; i < opt_cnt; i++)
433 device_remove_file(connector->kdev, &connector_attrs_opt1[i]);
434 for (i = 0; i < attr_cnt; i++)
435 device_remove_file(connector->kdev, &connector_attrs[i]);
436 device_unregister(connector->kdev);
437
438out:
439 return ret;
440}
441EXPORT_SYMBOL(drm_sysfs_connector_add);
442
443/**
444 * drm_sysfs_connector_remove - remove an connector device from sysfs
445 * @connector: connector to remove
446 *
447 * Remove @connector and its associated attributes from sysfs. Note that
448 * the device model core will take care of sending the "remove" uevent
449 * at this time, so we don't need to do it.
450 *
451 * Note:
452 * This routine should only be called if the connector was previously
453 * successfully registered. If @connector hasn't been registered yet,
454 * you'll likely see a panic somewhere deep in sysfs code when called.
455 */
456void drm_sysfs_connector_remove(struct drm_connector *connector)
457{
458 int i;
459
460 if (!connector->kdev)
461 return;
462 DRM_DEBUG("removing \"%s\" from sysfs\n",
463 drm_get_connector_name(connector));
464
465 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
466 device_remove_file(connector->kdev, &connector_attrs[i]);
467 sysfs_remove_bin_file(&connector->kdev->kobj, &edid_attr);
468 device_unregister(connector->kdev);
469 connector->kdev = NULL;
470}
471EXPORT_SYMBOL(drm_sysfs_connector_remove);
472
473/**
474 * drm_sysfs_hotplug_event - generate a DRM uevent
475 * @dev: DRM device
476 *
477 * Send a uevent for the DRM device specified by @dev. Currently we only
478 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
479 * deal with other types of events.
480 */
481void drm_sysfs_hotplug_event(struct drm_device *dev)
482{
483 char *event_string = "HOTPLUG=1";
484 char *envp[] = { event_string, NULL };
485
486 DRM_DEBUG("generating hotplug event\n");
487
488 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
489}
490EXPORT_SYMBOL(drm_sysfs_hotplug_event);
491
492static void drm_sysfs_release(struct device *dev)
493{
494 kfree(dev);
495}
496
497/**
498 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
499 * @dev: DRM device to be added
500 * @head: DRM head in question
501 *
502 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
503 * as the parent for the Linux device, and make sure it has a file containing
504 * the driver we're using (for userspace compatibility).
505 */
506int drm_sysfs_device_add(struct drm_minor *minor)
507{
508 char *minor_str;
509 int r;
510
511 if (minor->type == DRM_MINOR_CONTROL)
512 minor_str = "controlD%d";
513 else if (minor->type == DRM_MINOR_RENDER)
514 minor_str = "renderD%d";
515 else
516 minor_str = "card%d";
517
518 minor->kdev = kzalloc(sizeof(*minor->kdev), GFP_KERNEL);
519 if (!minor->kdev) {
520 r = -ENOMEM;
521 goto error;
522 }
523
524 device_initialize(minor->kdev);
525 minor->kdev->devt = MKDEV(DRM_MAJOR, minor->index);
526 minor->kdev->class = drm_class;
527 minor->kdev->type = &drm_sysfs_device_minor;
528 minor->kdev->parent = minor->dev->dev;
529 minor->kdev->release = drm_sysfs_release;
530 dev_set_drvdata(minor->kdev, minor);
531
532 r = dev_set_name(minor->kdev, minor_str, minor->index);
533 if (r < 0)
534 goto error;
535
536 r = device_add(minor->kdev);
537 if (r < 0)
538 goto error;
539
540 return 0;
541
542error:
543 DRM_ERROR("device create failed %d\n", r);
544 put_device(minor->kdev);
545 return r;
546}
547
548/**
549 * drm_sysfs_device_remove - remove DRM device
550 * @dev: DRM device to remove
551 *
552 * This call unregisters and cleans up a class device that was created with a
553 * call to drm_sysfs_device_add()
554 */
555void drm_sysfs_device_remove(struct drm_minor *minor)
556{
557 if (minor->kdev)
558 device_unregister(minor->kdev);
559 minor->kdev = NULL;
560}
561
562
563/**
564 * drm_class_device_register - Register a struct device in the drm class.
565 *
566 * @dev: pointer to struct device to register.
567 *
568 * @dev should have all relevant members pre-filled with the exception
569 * of the class member. In particular, the device_type member must
570 * be set.
571 */
572
573int drm_class_device_register(struct device *dev)
574{
575 if (!drm_class || IS_ERR(drm_class))
576 return -ENOENT;
577
578 dev->class = drm_class;
579 return device_register(dev);
580}
581EXPORT_SYMBOL_GPL(drm_class_device_register);
582
583void drm_class_device_unregister(struct device *dev)
584{
585 return device_unregister(dev);
586}
587EXPORT_SYMBOL_GPL(drm_class_device_unregister);