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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/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);