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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
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);