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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// SPDX-License-Identifier: GPL-2.0-only
2
3/*
4 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
5 * extra sysfs attribute from DRM. Normal drm_sysfs_class
6 * does not allow adding attributes.
7 *
8 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
9 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
10 * Copyright (c) 2003-2004 IBM Corp.
11 */
12
13#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/export.h>
16#include <linux/gfp.h>
17#include <linux/i2c.h>
18#include <linux/kdev_t.h>
19#include <linux/slab.h>
20
21#include <drm/drm_connector.h>
22#include <drm/drm_device.h>
23#include <drm/drm_file.h>
24#include <drm/drm_modes.h>
25#include <drm/drm_print.h>
26#include <drm/drm_property.h>
27#include <drm/drm_sysfs.h>
28
29#include "drm_internal.h"
30#include "drm_crtc_internal.h"
31
32#define to_drm_minor(d) dev_get_drvdata(d)
33#define to_drm_connector(d) dev_get_drvdata(d)
34
35/**
36 * DOC: overview
37 *
38 * DRM provides very little additional support to drivers for sysfs
39 * interactions, beyond just all the standard stuff. Drivers who want to expose
40 * additional sysfs properties and property groups can attach them at either
41 * &drm_device.dev or &drm_connector.kdev.
42 *
43 * Registration is automatically handled when calling drm_dev_register(), or
44 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
45 * also automatically handled by drm_dev_unregister() and
46 * drm_connector_unregister().
47 */
48
49static struct device_type drm_sysfs_device_minor = {
50 .name = "drm_minor"
51};
52
53struct class *drm_class;
54
55static char *drm_devnode(struct device *dev, umode_t *mode)
56{
57 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
58}
59
60static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
61
62/**
63 * drm_sysfs_init - initialize sysfs helpers
64 *
65 * This is used to create the DRM class, which is the implicit parent of any
66 * other top-level DRM sysfs objects.
67 *
68 * You must call drm_sysfs_destroy() to release the allocated resources.
69 *
70 * Return: 0 on success, negative error code on failure.
71 */
72int drm_sysfs_init(void)
73{
74 int err;
75
76 drm_class = class_create(THIS_MODULE, "drm");
77 if (IS_ERR(drm_class))
78 return PTR_ERR(drm_class);
79
80 err = class_create_file(drm_class, &class_attr_version.attr);
81 if (err) {
82 class_destroy(drm_class);
83 drm_class = NULL;
84 return err;
85 }
86
87 drm_class->devnode = drm_devnode;
88 return 0;
89}
90
91/**
92 * drm_sysfs_destroy - destroys DRM class
93 *
94 * Destroy the DRM device class.
95 */
96void drm_sysfs_destroy(void)
97{
98 if (IS_ERR_OR_NULL(drm_class))
99 return;
100 class_remove_file(drm_class, &class_attr_version.attr);
101 class_destroy(drm_class);
102 drm_class = NULL;
103}
104
105/*
106 * Connector properties
107 */
108static ssize_t status_store(struct device *device,
109 struct device_attribute *attr,
110 const char *buf, size_t count)
111{
112 struct drm_connector *connector = to_drm_connector(device);
113 struct drm_device *dev = connector->dev;
114 enum drm_connector_force old_force;
115 int ret;
116
117 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
118 if (ret)
119 return ret;
120
121 old_force = connector->force;
122
123 if (sysfs_streq(buf, "detect"))
124 connector->force = 0;
125 else if (sysfs_streq(buf, "on"))
126 connector->force = DRM_FORCE_ON;
127 else if (sysfs_streq(buf, "on-digital"))
128 connector->force = DRM_FORCE_ON_DIGITAL;
129 else if (sysfs_streq(buf, "off"))
130 connector->force = DRM_FORCE_OFF;
131 else
132 ret = -EINVAL;
133
134 if (old_force != connector->force || !connector->force) {
135 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
136 connector->base.id,
137 connector->name,
138 old_force, connector->force);
139
140 connector->funcs->fill_modes(connector,
141 dev->mode_config.max_width,
142 dev->mode_config.max_height);
143 }
144
145 mutex_unlock(&dev->mode_config.mutex);
146
147 return ret ? ret : count;
148}
149
150static ssize_t status_show(struct device *device,
151 struct device_attribute *attr,
152 char *buf)
153{
154 struct drm_connector *connector = to_drm_connector(device);
155 enum drm_connector_status status;
156
157 status = READ_ONCE(connector->status);
158
159 return sysfs_emit(buf, "%s\n",
160 drm_get_connector_status_name(status));
161}
162
163static ssize_t dpms_show(struct device *device,
164 struct device_attribute *attr,
165 char *buf)
166{
167 struct drm_connector *connector = to_drm_connector(device);
168 int dpms;
169
170 dpms = READ_ONCE(connector->dpms);
171
172 return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
173}
174
175static ssize_t enabled_show(struct device *device,
176 struct device_attribute *attr,
177 char *buf)
178{
179 struct drm_connector *connector = to_drm_connector(device);
180 bool enabled;
181
182 enabled = READ_ONCE(connector->encoder);
183
184 return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
185}
186
187static ssize_t edid_show(struct file *filp, struct kobject *kobj,
188 struct bin_attribute *attr, char *buf, loff_t off,
189 size_t count)
190{
191 struct device *connector_dev = kobj_to_dev(kobj);
192 struct drm_connector *connector = to_drm_connector(connector_dev);
193 unsigned char *edid;
194 size_t size;
195 ssize_t ret = 0;
196
197 mutex_lock(&connector->dev->mode_config.mutex);
198 if (!connector->edid_blob_ptr)
199 goto unlock;
200
201 edid = connector->edid_blob_ptr->data;
202 size = connector->edid_blob_ptr->length;
203 if (!edid)
204 goto unlock;
205
206 if (off >= size)
207 goto unlock;
208
209 if (off + count > size)
210 count = size - off;
211 memcpy(buf, edid + off, count);
212
213 ret = count;
214unlock:
215 mutex_unlock(&connector->dev->mode_config.mutex);
216
217 return ret;
218}
219
220static ssize_t modes_show(struct device *device,
221 struct device_attribute *attr,
222 char *buf)
223{
224 struct drm_connector *connector = to_drm_connector(device);
225 struct drm_display_mode *mode;
226 int written = 0;
227
228 mutex_lock(&connector->dev->mode_config.mutex);
229 list_for_each_entry(mode, &connector->modes, head) {
230 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
231 mode->name);
232 }
233 mutex_unlock(&connector->dev->mode_config.mutex);
234
235 return written;
236}
237
238static DEVICE_ATTR_RW(status);
239static DEVICE_ATTR_RO(enabled);
240static DEVICE_ATTR_RO(dpms);
241static DEVICE_ATTR_RO(modes);
242
243static struct attribute *connector_dev_attrs[] = {
244 &dev_attr_status.attr,
245 &dev_attr_enabled.attr,
246 &dev_attr_dpms.attr,
247 &dev_attr_modes.attr,
248 NULL
249};
250
251static struct bin_attribute edid_attr = {
252 .attr.name = "edid",
253 .attr.mode = 0444,
254 .size = 0,
255 .read = edid_show,
256};
257
258static struct bin_attribute *connector_bin_attrs[] = {
259 &edid_attr,
260 NULL
261};
262
263static const struct attribute_group connector_dev_group = {
264 .attrs = connector_dev_attrs,
265 .bin_attrs = connector_bin_attrs,
266};
267
268static const struct attribute_group *connector_dev_groups[] = {
269 &connector_dev_group,
270 NULL
271};
272
273int drm_sysfs_connector_add(struct drm_connector *connector)
274{
275 struct drm_device *dev = connector->dev;
276
277 if (connector->kdev)
278 return 0;
279
280 connector->kdev =
281 device_create_with_groups(drm_class, dev->primary->kdev, 0,
282 connector, connector_dev_groups,
283 "card%d-%s", dev->primary->index,
284 connector->name);
285 DRM_DEBUG("adding \"%s\" to sysfs\n",
286 connector->name);
287
288 if (IS_ERR(connector->kdev)) {
289 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
290 return PTR_ERR(connector->kdev);
291 }
292
293 if (connector->ddc)
294 return sysfs_create_link(&connector->kdev->kobj,
295 &connector->ddc->dev.kobj, "ddc");
296 return 0;
297}
298
299void drm_sysfs_connector_remove(struct drm_connector *connector)
300{
301 if (!connector->kdev)
302 return;
303
304 if (connector->ddc)
305 sysfs_remove_link(&connector->kdev->kobj, "ddc");
306
307 DRM_DEBUG("removing \"%s\" from sysfs\n",
308 connector->name);
309
310 device_unregister(connector->kdev);
311 connector->kdev = NULL;
312}
313
314void drm_sysfs_lease_event(struct drm_device *dev)
315{
316 char *event_string = "LEASE=1";
317 char *envp[] = { event_string, NULL };
318
319 DRM_DEBUG("generating lease event\n");
320
321 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
322}
323
324/**
325 * drm_sysfs_hotplug_event - generate a DRM uevent
326 * @dev: DRM device
327 *
328 * Send a uevent for the DRM device specified by @dev. Currently we only
329 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
330 * deal with other types of events.
331 *
332 * Any new uapi should be using the drm_sysfs_connector_status_event()
333 * for uevents on connector status change.
334 */
335void drm_sysfs_hotplug_event(struct drm_device *dev)
336{
337 char *event_string = "HOTPLUG=1";
338 char *envp[] = { event_string, NULL };
339
340 DRM_DEBUG("generating hotplug event\n");
341
342 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
343}
344EXPORT_SYMBOL(drm_sysfs_hotplug_event);
345
346/**
347 * drm_sysfs_connector_status_event - generate a DRM uevent for connector
348 * property status change
349 * @connector: connector on which property status changed
350 * @property: connector property whose status changed.
351 *
352 * Send a uevent for the DRM device specified by @dev. Currently we
353 * set HOTPLUG=1 and connector id along with the attached property id
354 * related to the status change.
355 */
356void drm_sysfs_connector_status_event(struct drm_connector *connector,
357 struct drm_property *property)
358{
359 struct drm_device *dev = connector->dev;
360 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
361 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
362
363 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
364 property->base.id));
365
366 snprintf(conn_id, ARRAY_SIZE(conn_id),
367 "CONNECTOR=%u", connector->base.id);
368 snprintf(prop_id, ARRAY_SIZE(prop_id),
369 "PROPERTY=%u", property->base.id);
370
371 DRM_DEBUG("generating connector status event\n");
372
373 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
374}
375EXPORT_SYMBOL(drm_sysfs_connector_status_event);
376
377static void drm_sysfs_release(struct device *dev)
378{
379 kfree(dev);
380}
381
382struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
383{
384 const char *minor_str;
385 struct device *kdev;
386 int r;
387
388 if (minor->type == DRM_MINOR_RENDER)
389 minor_str = "renderD%d";
390 else
391 minor_str = "card%d";
392
393 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
394 if (!kdev)
395 return ERR_PTR(-ENOMEM);
396
397 device_initialize(kdev);
398 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
399 kdev->class = drm_class;
400 kdev->type = &drm_sysfs_device_minor;
401 kdev->parent = minor->dev->dev;
402 kdev->release = drm_sysfs_release;
403 dev_set_drvdata(kdev, minor);
404
405 r = dev_set_name(kdev, minor_str, minor->index);
406 if (r < 0)
407 goto err_free;
408
409 return kdev;
410
411err_free:
412 put_device(kdev);
413 return ERR_PTR(r);
414}
415
416/**
417 * drm_class_device_register - register new device with the DRM sysfs class
418 * @dev: device to register
419 *
420 * Registers a new &struct device within the DRM sysfs class. Essentially only
421 * used by ttm to have a place for its global settings. Drivers should never use
422 * this.
423 */
424int drm_class_device_register(struct device *dev)
425{
426 if (!drm_class || IS_ERR(drm_class))
427 return -ENOENT;
428
429 dev->class = drm_class;
430 return device_register(dev);
431}
432EXPORT_SYMBOL_GPL(drm_class_device_register);
433
434/**
435 * drm_class_device_unregister - unregister device with the DRM sysfs class
436 * @dev: device to unregister
437 *
438 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
439 * by ttm to have a place for its global settings. Drivers should never use
440 * this.
441 */
442void drm_class_device_unregister(struct device *dev)
443{
444 return device_unregister(dev);
445}
446EXPORT_SYMBOL_GPL(drm_class_device_unregister);