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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/component.h>
15#include <linux/device.h>
16#include <linux/err.h>
17#include <linux/export.h>
18#include <linux/gfp.h>
19#include <linux/i2c.h>
20#include <linux/kdev_t.h>
21#include <linux/property.h>
22#include <linux/slab.h>
23
24#include <drm/drm_accel.h>
25#include <drm/drm_connector.h>
26#include <drm/drm_device.h>
27#include <drm/drm_file.h>
28#include <drm/drm_modes.h>
29#include <drm/drm_print.h>
30#include <drm/drm_property.h>
31#include <drm/drm_sysfs.h>
32
33#include "drm_internal.h"
34#include "drm_crtc_internal.h"
35
36#define to_drm_minor(d) dev_get_drvdata(d)
37#define to_drm_connector(d) dev_get_drvdata(d)
38
39/**
40 * DOC: overview
41 *
42 * DRM provides very little additional support to drivers for sysfs
43 * interactions, beyond just all the standard stuff. Drivers who want to expose
44 * additional sysfs properties and property groups can attach them at either
45 * &drm_device.dev or &drm_connector.kdev.
46 *
47 * Registration is automatically handled when calling drm_dev_register(), or
48 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
49 * also automatically handled by drm_dev_unregister() and
50 * drm_connector_unregister().
51 */
52
53static struct device_type drm_sysfs_device_minor = {
54 .name = "drm_minor"
55};
56
57static struct device_type drm_sysfs_device_connector = {
58 .name = "drm_connector",
59};
60
61struct class *drm_class;
62
63#ifdef CONFIG_ACPI
64static bool drm_connector_acpi_bus_match(struct device *dev)
65{
66 return dev->type == &drm_sysfs_device_connector;
67}
68
69static struct acpi_device *drm_connector_acpi_find_companion(struct device *dev)
70{
71 struct drm_connector *connector = to_drm_connector(dev);
72
73 return to_acpi_device_node(connector->fwnode);
74}
75
76static struct acpi_bus_type drm_connector_acpi_bus = {
77 .name = "drm_connector",
78 .match = drm_connector_acpi_bus_match,
79 .find_companion = drm_connector_acpi_find_companion,
80};
81
82static void drm_sysfs_acpi_register(void)
83{
84 register_acpi_bus_type(&drm_connector_acpi_bus);
85}
86
87static void drm_sysfs_acpi_unregister(void)
88{
89 unregister_acpi_bus_type(&drm_connector_acpi_bus);
90}
91#else
92static void drm_sysfs_acpi_register(void) { }
93static void drm_sysfs_acpi_unregister(void) { }
94#endif
95
96static char *drm_devnode(const struct device *dev, umode_t *mode)
97{
98 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
99}
100
101static int typec_connector_bind(struct device *dev,
102 struct device *typec_connector, void *data)
103{
104 int ret;
105
106 ret = sysfs_create_link(&dev->kobj, &typec_connector->kobj, "typec_connector");
107 if (ret)
108 return ret;
109
110 ret = sysfs_create_link(&typec_connector->kobj, &dev->kobj, "drm_connector");
111 if (ret)
112 sysfs_remove_link(&dev->kobj, "typec_connector");
113
114 return ret;
115}
116
117static void typec_connector_unbind(struct device *dev,
118 struct device *typec_connector, void *data)
119{
120 sysfs_remove_link(&typec_connector->kobj, "drm_connector");
121 sysfs_remove_link(&dev->kobj, "typec_connector");
122}
123
124static const struct component_ops typec_connector_ops = {
125 .bind = typec_connector_bind,
126 .unbind = typec_connector_unbind,
127};
128
129static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
130
131/**
132 * drm_sysfs_init - initialize sysfs helpers
133 *
134 * This is used to create the DRM class, which is the implicit parent of any
135 * other top-level DRM sysfs objects.
136 *
137 * You must call drm_sysfs_destroy() to release the allocated resources.
138 *
139 * Return: 0 on success, negative error code on failure.
140 */
141int drm_sysfs_init(void)
142{
143 int err;
144
145 drm_class = class_create("drm");
146 if (IS_ERR(drm_class))
147 return PTR_ERR(drm_class);
148
149 err = class_create_file(drm_class, &class_attr_version.attr);
150 if (err) {
151 class_destroy(drm_class);
152 drm_class = NULL;
153 return err;
154 }
155
156 drm_class->devnode = drm_devnode;
157
158 drm_sysfs_acpi_register();
159 return 0;
160}
161
162/**
163 * drm_sysfs_destroy - destroys DRM class
164 *
165 * Destroy the DRM device class.
166 */
167void drm_sysfs_destroy(void)
168{
169 if (IS_ERR_OR_NULL(drm_class))
170 return;
171 drm_sysfs_acpi_unregister();
172 class_remove_file(drm_class, &class_attr_version.attr);
173 class_destroy(drm_class);
174 drm_class = NULL;
175}
176
177static void drm_sysfs_release(struct device *dev)
178{
179 kfree(dev);
180}
181
182/*
183 * Connector properties
184 */
185static ssize_t status_store(struct device *device,
186 struct device_attribute *attr,
187 const char *buf, size_t count)
188{
189 struct drm_connector *connector = to_drm_connector(device);
190 struct drm_device *dev = connector->dev;
191 enum drm_connector_force old_force;
192 int ret;
193
194 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
195 if (ret)
196 return ret;
197
198 old_force = connector->force;
199
200 if (sysfs_streq(buf, "detect"))
201 connector->force = 0;
202 else if (sysfs_streq(buf, "on"))
203 connector->force = DRM_FORCE_ON;
204 else if (sysfs_streq(buf, "on-digital"))
205 connector->force = DRM_FORCE_ON_DIGITAL;
206 else if (sysfs_streq(buf, "off"))
207 connector->force = DRM_FORCE_OFF;
208 else
209 ret = -EINVAL;
210
211 if (old_force != connector->force || !connector->force) {
212 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
213 connector->base.id, connector->name,
214 old_force, connector->force);
215
216 connector->funcs->fill_modes(connector,
217 dev->mode_config.max_width,
218 dev->mode_config.max_height);
219 }
220
221 mutex_unlock(&dev->mode_config.mutex);
222
223 return ret ? ret : count;
224}
225
226static ssize_t status_show(struct device *device,
227 struct device_attribute *attr,
228 char *buf)
229{
230 struct drm_connector *connector = to_drm_connector(device);
231 enum drm_connector_status status;
232
233 status = READ_ONCE(connector->status);
234
235 return sysfs_emit(buf, "%s\n",
236 drm_get_connector_status_name(status));
237}
238
239static ssize_t dpms_show(struct device *device,
240 struct device_attribute *attr,
241 char *buf)
242{
243 struct drm_connector *connector = to_drm_connector(device);
244 int dpms;
245
246 dpms = READ_ONCE(connector->dpms);
247
248 return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
249}
250
251static ssize_t enabled_show(struct device *device,
252 struct device_attribute *attr,
253 char *buf)
254{
255 struct drm_connector *connector = to_drm_connector(device);
256 bool enabled;
257
258 enabled = READ_ONCE(connector->encoder);
259
260 return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
261}
262
263static ssize_t edid_show(struct file *filp, struct kobject *kobj,
264 struct bin_attribute *attr, char *buf, loff_t off,
265 size_t count)
266{
267 struct device *connector_dev = kobj_to_dev(kobj);
268 struct drm_connector *connector = to_drm_connector(connector_dev);
269 ssize_t ret;
270
271 ret = drm_edid_connector_property_show(connector, buf, off, count);
272
273 return ret;
274}
275
276static ssize_t modes_show(struct device *device,
277 struct device_attribute *attr,
278 char *buf)
279{
280 struct drm_connector *connector = to_drm_connector(device);
281 struct drm_display_mode *mode;
282 int written = 0;
283
284 mutex_lock(&connector->dev->mode_config.mutex);
285 list_for_each_entry(mode, &connector->modes, head) {
286 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
287 mode->name);
288 }
289 mutex_unlock(&connector->dev->mode_config.mutex);
290
291 return written;
292}
293
294static ssize_t connector_id_show(struct device *device,
295 struct device_attribute *attr,
296 char *buf)
297{
298 struct drm_connector *connector = to_drm_connector(device);
299
300 return sysfs_emit(buf, "%d\n", connector->base.id);
301}
302
303static DEVICE_ATTR_RW(status);
304static DEVICE_ATTR_RO(enabled);
305static DEVICE_ATTR_RO(dpms);
306static DEVICE_ATTR_RO(modes);
307static DEVICE_ATTR_RO(connector_id);
308
309static struct attribute *connector_dev_attrs[] = {
310 &dev_attr_status.attr,
311 &dev_attr_enabled.attr,
312 &dev_attr_dpms.attr,
313 &dev_attr_modes.attr,
314 &dev_attr_connector_id.attr,
315 NULL
316};
317
318static struct bin_attribute edid_attr = {
319 .attr.name = "edid",
320 .attr.mode = 0444,
321 .size = 0,
322 .read = edid_show,
323};
324
325static struct bin_attribute *connector_bin_attrs[] = {
326 &edid_attr,
327 NULL
328};
329
330static const struct attribute_group connector_dev_group = {
331 .attrs = connector_dev_attrs,
332 .bin_attrs = connector_bin_attrs,
333};
334
335static const struct attribute_group *connector_dev_groups[] = {
336 &connector_dev_group,
337 NULL
338};
339
340int drm_sysfs_connector_add(struct drm_connector *connector)
341{
342 struct drm_device *dev = connector->dev;
343 struct device *kdev;
344 int r;
345
346 if (connector->kdev)
347 return 0;
348
349 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
350 if (!kdev)
351 return -ENOMEM;
352
353 device_initialize(kdev);
354 kdev->class = drm_class;
355 kdev->type = &drm_sysfs_device_connector;
356 kdev->parent = dev->primary->kdev;
357 kdev->groups = connector_dev_groups;
358 kdev->release = drm_sysfs_release;
359 dev_set_drvdata(kdev, connector);
360
361 r = dev_set_name(kdev, "card%d-%s", dev->primary->index, connector->name);
362 if (r)
363 goto err_free;
364
365 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] adding connector to sysfs\n",
366 connector->base.id, connector->name);
367
368 r = device_add(kdev);
369 if (r) {
370 drm_err(dev, "failed to register connector device: %d\n", r);
371 goto err_free;
372 }
373
374 connector->kdev = kdev;
375
376 if (dev_fwnode(kdev)) {
377 r = component_add(kdev, &typec_connector_ops);
378 if (r)
379 drm_err(dev, "failed to add component to create link to typec connector\n");
380 }
381
382 return 0;
383
384err_free:
385 put_device(kdev);
386 return r;
387}
388
389int drm_sysfs_connector_add_late(struct drm_connector *connector)
390{
391 if (connector->ddc)
392 return sysfs_create_link(&connector->kdev->kobj,
393 &connector->ddc->dev.kobj, "ddc");
394
395 return 0;
396}
397
398void drm_sysfs_connector_remove_early(struct drm_connector *connector)
399{
400 if (connector->ddc)
401 sysfs_remove_link(&connector->kdev->kobj, "ddc");
402}
403
404void drm_sysfs_connector_remove(struct drm_connector *connector)
405{
406 if (!connector->kdev)
407 return;
408
409 if (dev_fwnode(connector->kdev))
410 component_del(connector->kdev, &typec_connector_ops);
411
412 drm_dbg_kms(connector->dev,
413 "[CONNECTOR:%d:%s] removing connector from sysfs\n",
414 connector->base.id, connector->name);
415
416 device_unregister(connector->kdev);
417 connector->kdev = NULL;
418}
419
420void drm_sysfs_lease_event(struct drm_device *dev)
421{
422 char *event_string = "LEASE=1";
423 char *envp[] = { event_string, NULL };
424
425 drm_dbg_lease(dev, "generating lease event\n");
426
427 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
428}
429
430/**
431 * drm_sysfs_hotplug_event - generate a DRM uevent
432 * @dev: DRM device
433 *
434 * Send a uevent for the DRM device specified by @dev. Currently we only
435 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
436 * deal with other types of events.
437 *
438 * Any new uapi should be using the drm_sysfs_connector_status_event()
439 * for uevents on connector status change.
440 */
441void drm_sysfs_hotplug_event(struct drm_device *dev)
442{
443 char *event_string = "HOTPLUG=1";
444 char *envp[] = { event_string, NULL };
445
446 drm_dbg_kms(dev, "generating hotplug event\n");
447
448 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
449}
450EXPORT_SYMBOL(drm_sysfs_hotplug_event);
451
452/**
453 * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
454 * change
455 * @connector: connector which has changed
456 *
457 * Send a uevent for the DRM connector specified by @connector. This will send
458 * a uevent with the properties HOTPLUG=1 and CONNECTOR.
459 */
460void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
461{
462 struct drm_device *dev = connector->dev;
463 char hotplug_str[] = "HOTPLUG=1", conn_id[21];
464 char *envp[] = { hotplug_str, conn_id, NULL };
465
466 snprintf(conn_id, sizeof(conn_id),
467 "CONNECTOR=%u", connector->base.id);
468
469 drm_dbg_kms(connector->dev,
470 "[CONNECTOR:%d:%s] generating connector hotplug event\n",
471 connector->base.id, connector->name);
472
473 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
474}
475EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);
476
477/**
478 * drm_sysfs_connector_property_event - generate a DRM uevent for connector
479 * property change
480 * @connector: connector on which property changed
481 * @property: connector property which has changed.
482 *
483 * Send a uevent for the specified DRM connector and property. Currently we
484 * set HOTPLUG=1 and connector id along with the attached property id
485 * related to the change.
486 */
487void drm_sysfs_connector_property_event(struct drm_connector *connector,
488 struct drm_property *property)
489{
490 struct drm_device *dev = connector->dev;
491 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
492 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
493
494 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
495 property->base.id));
496
497 snprintf(conn_id, ARRAY_SIZE(conn_id),
498 "CONNECTOR=%u", connector->base.id);
499 snprintf(prop_id, ARRAY_SIZE(prop_id),
500 "PROPERTY=%u", property->base.id);
501
502 drm_dbg_kms(connector->dev,
503 "[CONNECTOR:%d:%s] generating connector property event for [PROP:%d:%s]\n",
504 connector->base.id, connector->name,
505 property->base.id, property->name);
506
507 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
508}
509EXPORT_SYMBOL(drm_sysfs_connector_property_event);
510
511struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
512{
513 const char *minor_str;
514 struct device *kdev;
515 int r;
516
517 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
518 if (!kdev)
519 return ERR_PTR(-ENOMEM);
520
521 device_initialize(kdev);
522
523 if (minor->type == DRM_MINOR_ACCEL) {
524 minor_str = "accel%d";
525 accel_set_device_instance_params(kdev, minor->index);
526 } else {
527 if (minor->type == DRM_MINOR_RENDER)
528 minor_str = "renderD%d";
529 else
530 minor_str = "card%d";
531
532 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
533 kdev->class = drm_class;
534 kdev->type = &drm_sysfs_device_minor;
535 }
536
537 kdev->parent = minor->dev->dev;
538 kdev->release = drm_sysfs_release;
539 dev_set_drvdata(kdev, minor);
540
541 r = dev_set_name(kdev, minor_str, minor->index);
542 if (r < 0)
543 goto err_free;
544
545 return kdev;
546
547err_free:
548 put_device(kdev);
549 return ERR_PTR(r);
550}
551
552/**
553 * drm_class_device_register - register new device with the DRM sysfs class
554 * @dev: device to register
555 *
556 * Registers a new &struct device within the DRM sysfs class. Essentially only
557 * used by ttm to have a place for its global settings. Drivers should never use
558 * this.
559 */
560int drm_class_device_register(struct device *dev)
561{
562 if (!drm_class || IS_ERR(drm_class))
563 return -ENOENT;
564
565 dev->class = drm_class;
566 return device_register(dev);
567}
568EXPORT_SYMBOL_GPL(drm_class_device_register);
569
570/**
571 * drm_class_device_unregister - unregister device with the DRM sysfs class
572 * @dev: device to unregister
573 *
574 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
575 * by ttm to have a place for its global settings. Drivers should never use
576 * this.
577 */
578void drm_class_device_unregister(struct device *dev)
579{
580 return device_unregister(dev);
581}
582EXPORT_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
28/**
29 * DOC: overview
30 *
31 * DRM provides very little additional support to drivers for sysfs
32 * interactions, beyond just all the standard stuff. Drivers who want to expose
33 * additional sysfs properties and property groups can attach them at either
34 * &drm_device.dev or &drm_connector.kdev.
35 *
36 * Registration is automatically handled when calling drm_dev_register(), or
37 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
38 * also automatically handled by drm_dev_unregister() and
39 * drm_connector_unregister().
40 */
41
42static struct device_type drm_sysfs_device_minor = {
43 .name = "drm_minor"
44};
45
46struct class *drm_class;
47
48static char *drm_devnode(struct device *dev, umode_t *mode)
49{
50 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
51}
52
53static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
54
55/**
56 * drm_sysfs_init - initialize sysfs helpers
57 *
58 * This is used to create the DRM class, which is the implicit parent of any
59 * other top-level DRM sysfs objects.
60 *
61 * You must call drm_sysfs_destroy() to release the allocated resources.
62 *
63 * Return: 0 on success, negative error code on failure.
64 */
65int drm_sysfs_init(void)
66{
67 int err;
68
69 drm_class = class_create(THIS_MODULE, "drm");
70 if (IS_ERR(drm_class))
71 return PTR_ERR(drm_class);
72
73 err = class_create_file(drm_class, &class_attr_version.attr);
74 if (err) {
75 class_destroy(drm_class);
76 drm_class = NULL;
77 return err;
78 }
79
80 drm_class->devnode = drm_devnode;
81 return 0;
82}
83
84/**
85 * drm_sysfs_destroy - destroys DRM class
86 *
87 * Destroy the DRM device class.
88 */
89void drm_sysfs_destroy(void)
90{
91 if (IS_ERR_OR_NULL(drm_class))
92 return;
93 class_remove_file(drm_class, &class_attr_version.attr);
94 class_destroy(drm_class);
95 drm_class = NULL;
96}
97
98/*
99 * Connector properties
100 */
101static ssize_t status_store(struct device *device,
102 struct device_attribute *attr,
103 const char *buf, size_t count)
104{
105 struct drm_connector *connector = to_drm_connector(device);
106 struct drm_device *dev = connector->dev;
107 enum drm_connector_force old_force;
108 int ret;
109
110 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
111 if (ret)
112 return ret;
113
114 old_force = connector->force;
115
116 if (sysfs_streq(buf, "detect"))
117 connector->force = 0;
118 else if (sysfs_streq(buf, "on"))
119 connector->force = DRM_FORCE_ON;
120 else if (sysfs_streq(buf, "on-digital"))
121 connector->force = DRM_FORCE_ON_DIGITAL;
122 else if (sysfs_streq(buf, "off"))
123 connector->force = DRM_FORCE_OFF;
124 else
125 ret = -EINVAL;
126
127 if (old_force != connector->force || !connector->force) {
128 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
129 connector->base.id,
130 connector->name,
131 old_force, connector->force);
132
133 connector->funcs->fill_modes(connector,
134 dev->mode_config.max_width,
135 dev->mode_config.max_height);
136 }
137
138 mutex_unlock(&dev->mode_config.mutex);
139
140 return ret ? ret : count;
141}
142
143static ssize_t status_show(struct device *device,
144 struct device_attribute *attr,
145 char *buf)
146{
147 struct drm_connector *connector = to_drm_connector(device);
148 enum drm_connector_status status;
149
150 status = READ_ONCE(connector->status);
151
152 return snprintf(buf, PAGE_SIZE, "%s\n",
153 drm_get_connector_status_name(status));
154}
155
156static ssize_t dpms_show(struct device *device,
157 struct device_attribute *attr,
158 char *buf)
159{
160 struct drm_connector *connector = to_drm_connector(device);
161 int dpms;
162
163 dpms = READ_ONCE(connector->dpms);
164
165 return snprintf(buf, PAGE_SIZE, "%s\n",
166 drm_get_dpms_name(dpms));
167}
168
169static ssize_t enabled_show(struct device *device,
170 struct device_attribute *attr,
171 char *buf)
172{
173 struct drm_connector *connector = to_drm_connector(device);
174 bool enabled;
175
176 enabled = READ_ONCE(connector->encoder);
177
178 return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
179}
180
181static ssize_t edid_show(struct file *filp, struct kobject *kobj,
182 struct bin_attribute *attr, char *buf, loff_t off,
183 size_t count)
184{
185 struct device *connector_dev = kobj_to_dev(kobj);
186 struct drm_connector *connector = to_drm_connector(connector_dev);
187 unsigned char *edid;
188 size_t size;
189 ssize_t ret = 0;
190
191 mutex_lock(&connector->dev->mode_config.mutex);
192 if (!connector->edid_blob_ptr)
193 goto unlock;
194
195 edid = connector->edid_blob_ptr->data;
196 size = connector->edid_blob_ptr->length;
197 if (!edid)
198 goto unlock;
199
200 if (off >= size)
201 goto unlock;
202
203 if (off + count > size)
204 count = size - off;
205 memcpy(buf, edid + off, count);
206
207 ret = count;
208unlock:
209 mutex_unlock(&connector->dev->mode_config.mutex);
210
211 return ret;
212}
213
214static ssize_t modes_show(struct device *device,
215 struct device_attribute *attr,
216 char *buf)
217{
218 struct drm_connector *connector = to_drm_connector(device);
219 struct drm_display_mode *mode;
220 int written = 0;
221
222 mutex_lock(&connector->dev->mode_config.mutex);
223 list_for_each_entry(mode, &connector->modes, head) {
224 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
225 mode->name);
226 }
227 mutex_unlock(&connector->dev->mode_config.mutex);
228
229 return written;
230}
231
232static DEVICE_ATTR_RW(status);
233static DEVICE_ATTR_RO(enabled);
234static DEVICE_ATTR_RO(dpms);
235static DEVICE_ATTR_RO(modes);
236
237static struct attribute *connector_dev_attrs[] = {
238 &dev_attr_status.attr,
239 &dev_attr_enabled.attr,
240 &dev_attr_dpms.attr,
241 &dev_attr_modes.attr,
242 NULL
243};
244
245static struct bin_attribute edid_attr = {
246 .attr.name = "edid",
247 .attr.mode = 0444,
248 .size = 0,
249 .read = edid_show,
250};
251
252static struct bin_attribute *connector_bin_attrs[] = {
253 &edid_attr,
254 NULL
255};
256
257static const struct attribute_group connector_dev_group = {
258 .attrs = connector_dev_attrs,
259 .bin_attrs = connector_bin_attrs,
260};
261
262static const struct attribute_group *connector_dev_groups[] = {
263 &connector_dev_group,
264 NULL
265};
266
267int drm_sysfs_connector_add(struct drm_connector *connector)
268{
269 struct drm_device *dev = connector->dev;
270
271 if (connector->kdev)
272 return 0;
273
274 connector->kdev =
275 device_create_with_groups(drm_class, dev->primary->kdev, 0,
276 connector, connector_dev_groups,
277 "card%d-%s", dev->primary->index,
278 connector->name);
279 DRM_DEBUG("adding \"%s\" to sysfs\n",
280 connector->name);
281
282 if (IS_ERR(connector->kdev)) {
283 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
284 return PTR_ERR(connector->kdev);
285 }
286
287 /* Let userspace know we have a new connector */
288 drm_sysfs_hotplug_event(dev);
289
290 return 0;
291}
292
293void drm_sysfs_connector_remove(struct drm_connector *connector)
294{
295 if (!connector->kdev)
296 return;
297 DRM_DEBUG("removing \"%s\" from sysfs\n",
298 connector->name);
299
300 device_unregister(connector->kdev);
301 connector->kdev = NULL;
302}
303
304/**
305 * drm_sysfs_hotplug_event - generate a DRM uevent
306 * @dev: DRM device
307 *
308 * Send a uevent for the DRM device specified by @dev. Currently we only
309 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
310 * deal with other types of events.
311 */
312void drm_sysfs_hotplug_event(struct drm_device *dev)
313{
314 char *event_string = "HOTPLUG=1";
315 char *envp[] = { event_string, NULL };
316
317 DRM_DEBUG("generating hotplug event\n");
318
319 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
320}
321EXPORT_SYMBOL(drm_sysfs_hotplug_event);
322
323static void drm_sysfs_release(struct device *dev)
324{
325 kfree(dev);
326}
327
328struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
329{
330 const char *minor_str;
331 struct device *kdev;
332 int r;
333
334 if (minor->type == DRM_MINOR_CONTROL)
335 minor_str = "controlD%d";
336 else if (minor->type == DRM_MINOR_RENDER)
337 minor_str = "renderD%d";
338 else
339 minor_str = "card%d";
340
341 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
342 if (!kdev)
343 return ERR_PTR(-ENOMEM);
344
345 device_initialize(kdev);
346 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
347 kdev->class = drm_class;
348 kdev->type = &drm_sysfs_device_minor;
349 kdev->parent = minor->dev->dev;
350 kdev->release = drm_sysfs_release;
351 dev_set_drvdata(kdev, minor);
352
353 r = dev_set_name(kdev, minor_str, minor->index);
354 if (r < 0)
355 goto err_free;
356
357 return kdev;
358
359err_free:
360 put_device(kdev);
361 return ERR_PTR(r);
362}
363
364/**
365 * drm_class_device_register - register new device with the DRM sysfs class
366 * @dev: device to register
367 *
368 * Registers a new &struct device within the DRM sysfs class. Essentially only
369 * used by ttm to have a place for its global settings. Drivers should never use
370 * this.
371 */
372int drm_class_device_register(struct device *dev)
373{
374 if (!drm_class || IS_ERR(drm_class))
375 return -ENOENT;
376
377 dev->class = drm_class;
378 return device_register(dev);
379}
380EXPORT_SYMBOL_GPL(drm_class_device_register);
381
382/**
383 * drm_class_device_unregister - unregister device with the DRM sysfs class
384 * @dev: device to unregister
385 *
386 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
387 * by ttm to have a place for its global settings. Drivers should never use
388 * this.
389 */
390void drm_class_device_unregister(struct device *dev)
391{
392 return device_unregister(dev);
393}
394EXPORT_SYMBOL_GPL(drm_class_device_unregister);