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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/acpi.h>
14#include <linux/device.h>
15#include <linux/err.h>
16#include <linux/export.h>
17#include <linux/gfp.h>
18#include <linux/i2c.h>
19#include <linux/kdev_t.h>
20#include <linux/slab.h>
21
22#include <drm/drm_accel.h>
23#include <drm/drm_connector.h>
24#include <drm/drm_device.h>
25#include <drm/drm_file.h>
26#include <drm/drm_modes.h>
27#include <drm/drm_print.h>
28#include <drm/drm_property.h>
29#include <drm/drm_sysfs.h>
30
31#include "drm_internal.h"
32#include "drm_crtc_internal.h"
33
34#define to_drm_minor(d) dev_get_drvdata(d)
35#define to_drm_connector(d) dev_get_drvdata(d)
36
37/**
38 * DOC: overview
39 *
40 * DRM provides very little additional support to drivers for sysfs
41 * interactions, beyond just all the standard stuff. Drivers who want to expose
42 * additional sysfs properties and property groups can attach them at either
43 * &drm_device.dev or &drm_connector.kdev.
44 *
45 * Registration is automatically handled when calling drm_dev_register(), or
46 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
47 * also automatically handled by drm_dev_unregister() and
48 * drm_connector_unregister().
49 */
50
51static struct device_type drm_sysfs_device_minor = {
52 .name = "drm_minor"
53};
54
55static struct device_type drm_sysfs_device_connector = {
56 .name = "drm_connector",
57};
58
59struct class *drm_class;
60
61#ifdef CONFIG_ACPI
62static bool drm_connector_acpi_bus_match(struct device *dev)
63{
64 return dev->type == &drm_sysfs_device_connector;
65}
66
67static struct acpi_device *drm_connector_acpi_find_companion(struct device *dev)
68{
69 struct drm_connector *connector = to_drm_connector(dev);
70
71 return to_acpi_device_node(connector->fwnode);
72}
73
74static struct acpi_bus_type drm_connector_acpi_bus = {
75 .name = "drm_connector",
76 .match = drm_connector_acpi_bus_match,
77 .find_companion = drm_connector_acpi_find_companion,
78};
79
80static void drm_sysfs_acpi_register(void)
81{
82 register_acpi_bus_type(&drm_connector_acpi_bus);
83}
84
85static void drm_sysfs_acpi_unregister(void)
86{
87 unregister_acpi_bus_type(&drm_connector_acpi_bus);
88}
89#else
90static void drm_sysfs_acpi_register(void) { }
91static void drm_sysfs_acpi_unregister(void) { }
92#endif
93
94static char *drm_devnode(const struct device *dev, umode_t *mode)
95{
96 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
97}
98
99static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
100
101/**
102 * drm_sysfs_init - initialize sysfs helpers
103 *
104 * This is used to create the DRM class, which is the implicit parent of any
105 * other top-level DRM sysfs objects.
106 *
107 * You must call drm_sysfs_destroy() to release the allocated resources.
108 *
109 * Return: 0 on success, negative error code on failure.
110 */
111int drm_sysfs_init(void)
112{
113 int err;
114
115 drm_class = class_create(THIS_MODULE, "drm");
116 if (IS_ERR(drm_class))
117 return PTR_ERR(drm_class);
118
119 err = class_create_file(drm_class, &class_attr_version.attr);
120 if (err) {
121 class_destroy(drm_class);
122 drm_class = NULL;
123 return err;
124 }
125
126 drm_class->devnode = drm_devnode;
127
128 drm_sysfs_acpi_register();
129 return 0;
130}
131
132/**
133 * drm_sysfs_destroy - destroys DRM class
134 *
135 * Destroy the DRM device class.
136 */
137void drm_sysfs_destroy(void)
138{
139 if (IS_ERR_OR_NULL(drm_class))
140 return;
141 drm_sysfs_acpi_unregister();
142 class_remove_file(drm_class, &class_attr_version.attr);
143 class_destroy(drm_class);
144 drm_class = NULL;
145}
146
147static void drm_sysfs_release(struct device *dev)
148{
149 kfree(dev);
150}
151
152/*
153 * Connector properties
154 */
155static ssize_t status_store(struct device *device,
156 struct device_attribute *attr,
157 const char *buf, size_t count)
158{
159 struct drm_connector *connector = to_drm_connector(device);
160 struct drm_device *dev = connector->dev;
161 enum drm_connector_force old_force;
162 int ret;
163
164 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
165 if (ret)
166 return ret;
167
168 old_force = connector->force;
169
170 if (sysfs_streq(buf, "detect"))
171 connector->force = 0;
172 else if (sysfs_streq(buf, "on"))
173 connector->force = DRM_FORCE_ON;
174 else if (sysfs_streq(buf, "on-digital"))
175 connector->force = DRM_FORCE_ON_DIGITAL;
176 else if (sysfs_streq(buf, "off"))
177 connector->force = DRM_FORCE_OFF;
178 else
179 ret = -EINVAL;
180
181 if (old_force != connector->force || !connector->force) {
182 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
183 connector->base.id,
184 connector->name,
185 old_force, connector->force);
186
187 connector->funcs->fill_modes(connector,
188 dev->mode_config.max_width,
189 dev->mode_config.max_height);
190 }
191
192 mutex_unlock(&dev->mode_config.mutex);
193
194 return ret ? ret : count;
195}
196
197static ssize_t status_show(struct device *device,
198 struct device_attribute *attr,
199 char *buf)
200{
201 struct drm_connector *connector = to_drm_connector(device);
202 enum drm_connector_status status;
203
204 status = READ_ONCE(connector->status);
205
206 return sysfs_emit(buf, "%s\n",
207 drm_get_connector_status_name(status));
208}
209
210static ssize_t dpms_show(struct device *device,
211 struct device_attribute *attr,
212 char *buf)
213{
214 struct drm_connector *connector = to_drm_connector(device);
215 int dpms;
216
217 dpms = READ_ONCE(connector->dpms);
218
219 return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
220}
221
222static ssize_t enabled_show(struct device *device,
223 struct device_attribute *attr,
224 char *buf)
225{
226 struct drm_connector *connector = to_drm_connector(device);
227 bool enabled;
228
229 enabled = READ_ONCE(connector->encoder);
230
231 return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
232}
233
234static ssize_t edid_show(struct file *filp, struct kobject *kobj,
235 struct bin_attribute *attr, char *buf, loff_t off,
236 size_t count)
237{
238 struct device *connector_dev = kobj_to_dev(kobj);
239 struct drm_connector *connector = to_drm_connector(connector_dev);
240 unsigned char *edid;
241 size_t size;
242 ssize_t ret = 0;
243
244 mutex_lock(&connector->dev->mode_config.mutex);
245 if (!connector->edid_blob_ptr)
246 goto unlock;
247
248 edid = connector->edid_blob_ptr->data;
249 size = connector->edid_blob_ptr->length;
250 if (!edid)
251 goto unlock;
252
253 if (off >= size)
254 goto unlock;
255
256 if (off + count > size)
257 count = size - off;
258 memcpy(buf, edid + off, count);
259
260 ret = count;
261unlock:
262 mutex_unlock(&connector->dev->mode_config.mutex);
263
264 return ret;
265}
266
267static ssize_t modes_show(struct device *device,
268 struct device_attribute *attr,
269 char *buf)
270{
271 struct drm_connector *connector = to_drm_connector(device);
272 struct drm_display_mode *mode;
273 int written = 0;
274
275 mutex_lock(&connector->dev->mode_config.mutex);
276 list_for_each_entry(mode, &connector->modes, head) {
277 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
278 mode->name);
279 }
280 mutex_unlock(&connector->dev->mode_config.mutex);
281
282 return written;
283}
284
285static DEVICE_ATTR_RW(status);
286static DEVICE_ATTR_RO(enabled);
287static DEVICE_ATTR_RO(dpms);
288static DEVICE_ATTR_RO(modes);
289
290static struct attribute *connector_dev_attrs[] = {
291 &dev_attr_status.attr,
292 &dev_attr_enabled.attr,
293 &dev_attr_dpms.attr,
294 &dev_attr_modes.attr,
295 NULL
296};
297
298static struct bin_attribute edid_attr = {
299 .attr.name = "edid",
300 .attr.mode = 0444,
301 .size = 0,
302 .read = edid_show,
303};
304
305static struct bin_attribute *connector_bin_attrs[] = {
306 &edid_attr,
307 NULL
308};
309
310static const struct attribute_group connector_dev_group = {
311 .attrs = connector_dev_attrs,
312 .bin_attrs = connector_bin_attrs,
313};
314
315static const struct attribute_group *connector_dev_groups[] = {
316 &connector_dev_group,
317 NULL
318};
319
320int drm_sysfs_connector_add(struct drm_connector *connector)
321{
322 struct drm_device *dev = connector->dev;
323 struct device *kdev;
324 int r;
325
326 if (connector->kdev)
327 return 0;
328
329 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
330 if (!kdev)
331 return -ENOMEM;
332
333 device_initialize(kdev);
334 kdev->class = drm_class;
335 kdev->type = &drm_sysfs_device_connector;
336 kdev->parent = dev->primary->kdev;
337 kdev->groups = connector_dev_groups;
338 kdev->release = drm_sysfs_release;
339 dev_set_drvdata(kdev, connector);
340
341 r = dev_set_name(kdev, "card%d-%s", dev->primary->index, connector->name);
342 if (r)
343 goto err_free;
344
345 DRM_DEBUG("adding \"%s\" to sysfs\n",
346 connector->name);
347
348 r = device_add(kdev);
349 if (r) {
350 drm_err(dev, "failed to register connector device: %d\n", r);
351 goto err_free;
352 }
353
354 connector->kdev = kdev;
355
356 if (connector->ddc)
357 return sysfs_create_link(&connector->kdev->kobj,
358 &connector->ddc->dev.kobj, "ddc");
359 return 0;
360
361err_free:
362 put_device(kdev);
363 return r;
364}
365
366void drm_sysfs_connector_remove(struct drm_connector *connector)
367{
368 if (!connector->kdev)
369 return;
370
371 if (connector->ddc)
372 sysfs_remove_link(&connector->kdev->kobj, "ddc");
373
374 DRM_DEBUG("removing \"%s\" from sysfs\n",
375 connector->name);
376
377 device_unregister(connector->kdev);
378 connector->kdev = NULL;
379}
380
381void drm_sysfs_lease_event(struct drm_device *dev)
382{
383 char *event_string = "LEASE=1";
384 char *envp[] = { event_string, NULL };
385
386 DRM_DEBUG("generating lease event\n");
387
388 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
389}
390
391/**
392 * drm_sysfs_hotplug_event - generate a DRM uevent
393 * @dev: DRM device
394 *
395 * Send a uevent for the DRM device specified by @dev. Currently we only
396 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
397 * deal with other types of events.
398 *
399 * Any new uapi should be using the drm_sysfs_connector_status_event()
400 * for uevents on connector status change.
401 */
402void drm_sysfs_hotplug_event(struct drm_device *dev)
403{
404 char *event_string = "HOTPLUG=1";
405 char *envp[] = { event_string, NULL };
406
407 DRM_DEBUG("generating hotplug event\n");
408
409 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
410}
411EXPORT_SYMBOL(drm_sysfs_hotplug_event);
412
413/**
414 * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
415 * change
416 * @connector: connector which has changed
417 *
418 * Send a uevent for the DRM connector specified by @connector. This will send
419 * a uevent with the properties HOTPLUG=1 and CONNECTOR.
420 */
421void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
422{
423 struct drm_device *dev = connector->dev;
424 char hotplug_str[] = "HOTPLUG=1", conn_id[21];
425 char *envp[] = { hotplug_str, conn_id, NULL };
426
427 snprintf(conn_id, sizeof(conn_id),
428 "CONNECTOR=%u", connector->base.id);
429
430 drm_dbg_kms(connector->dev,
431 "[CONNECTOR:%d:%s] generating connector hotplug event\n",
432 connector->base.id, connector->name);
433
434 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
435}
436EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);
437
438/**
439 * drm_sysfs_connector_status_event - generate a DRM uevent for connector
440 * property status change
441 * @connector: connector on which property status changed
442 * @property: connector property whose status changed.
443 *
444 * Send a uevent for the DRM device specified by @dev. Currently we
445 * set HOTPLUG=1 and connector id along with the attached property id
446 * related to the status change.
447 */
448void drm_sysfs_connector_status_event(struct drm_connector *connector,
449 struct drm_property *property)
450{
451 struct drm_device *dev = connector->dev;
452 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
453 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
454
455 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
456 property->base.id));
457
458 snprintf(conn_id, ARRAY_SIZE(conn_id),
459 "CONNECTOR=%u", connector->base.id);
460 snprintf(prop_id, ARRAY_SIZE(prop_id),
461 "PROPERTY=%u", property->base.id);
462
463 DRM_DEBUG("generating connector status event\n");
464
465 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
466}
467EXPORT_SYMBOL(drm_sysfs_connector_status_event);
468
469struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
470{
471 const char *minor_str;
472 struct device *kdev;
473 int r;
474
475 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
476 if (!kdev)
477 return ERR_PTR(-ENOMEM);
478
479 device_initialize(kdev);
480
481 if (minor->type == DRM_MINOR_ACCEL) {
482 minor_str = "accel%d";
483 accel_set_device_instance_params(kdev, minor->index);
484 } else {
485 if (minor->type == DRM_MINOR_RENDER)
486 minor_str = "renderD%d";
487 else
488 minor_str = "card%d";
489
490 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
491 kdev->class = drm_class;
492 kdev->type = &drm_sysfs_device_minor;
493 }
494
495 kdev->parent = minor->dev->dev;
496 kdev->release = drm_sysfs_release;
497 dev_set_drvdata(kdev, minor);
498
499 r = dev_set_name(kdev, minor_str, minor->index);
500 if (r < 0)
501 goto err_free;
502
503 return kdev;
504
505err_free:
506 put_device(kdev);
507 return ERR_PTR(r);
508}
509
510/**
511 * drm_class_device_register - register new device with the DRM sysfs class
512 * @dev: device to register
513 *
514 * Registers a new &struct device within the DRM sysfs class. Essentially only
515 * used by ttm to have a place for its global settings. Drivers should never use
516 * this.
517 */
518int drm_class_device_register(struct device *dev)
519{
520 if (!drm_class || IS_ERR(drm_class))
521 return -ENOENT;
522
523 dev->class = drm_class;
524 return device_register(dev);
525}
526EXPORT_SYMBOL_GPL(drm_class_device_register);
527
528/**
529 * drm_class_device_unregister - unregister device with the DRM sysfs class
530 * @dev: device to unregister
531 *
532 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
533 * by ttm to have a place for its global settings. Drivers should never use
534 * this.
535 */
536void drm_class_device_unregister(struct device *dev)
537{
538 return device_unregister(dev);
539}
540EXPORT_SYMBOL_GPL(drm_class_device_unregister);