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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_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
213 connector->base.id,
214 connector->name,
215 old_force, connector->force);
216
217 connector->funcs->fill_modes(connector,
218 dev->mode_config.max_width,
219 dev->mode_config.max_height);
220 }
221
222 mutex_unlock(&dev->mode_config.mutex);
223
224 return ret ? ret : count;
225}
226
227static ssize_t status_show(struct device *device,
228 struct device_attribute *attr,
229 char *buf)
230{
231 struct drm_connector *connector = to_drm_connector(device);
232 enum drm_connector_status status;
233
234 status = READ_ONCE(connector->status);
235
236 return sysfs_emit(buf, "%s\n",
237 drm_get_connector_status_name(status));
238}
239
240static ssize_t dpms_show(struct device *device,
241 struct device_attribute *attr,
242 char *buf)
243{
244 struct drm_connector *connector = to_drm_connector(device);
245 int dpms;
246
247 dpms = READ_ONCE(connector->dpms);
248
249 return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
250}
251
252static ssize_t enabled_show(struct device *device,
253 struct device_attribute *attr,
254 char *buf)
255{
256 struct drm_connector *connector = to_drm_connector(device);
257 bool enabled;
258
259 enabled = READ_ONCE(connector->encoder);
260
261 return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
262}
263
264static ssize_t edid_show(struct file *filp, struct kobject *kobj,
265 struct bin_attribute *attr, char *buf, loff_t off,
266 size_t count)
267{
268 struct device *connector_dev = kobj_to_dev(kobj);
269 struct drm_connector *connector = to_drm_connector(connector_dev);
270 unsigned char *edid;
271 size_t size;
272 ssize_t ret = 0;
273
274 mutex_lock(&connector->dev->mode_config.mutex);
275 if (!connector->edid_blob_ptr)
276 goto unlock;
277
278 edid = connector->edid_blob_ptr->data;
279 size = connector->edid_blob_ptr->length;
280 if (!edid)
281 goto unlock;
282
283 if (off >= size)
284 goto unlock;
285
286 if (off + count > size)
287 count = size - off;
288 memcpy(buf, edid + off, count);
289
290 ret = count;
291unlock:
292 mutex_unlock(&connector->dev->mode_config.mutex);
293
294 return ret;
295}
296
297static ssize_t modes_show(struct device *device,
298 struct device_attribute *attr,
299 char *buf)
300{
301 struct drm_connector *connector = to_drm_connector(device);
302 struct drm_display_mode *mode;
303 int written = 0;
304
305 mutex_lock(&connector->dev->mode_config.mutex);
306 list_for_each_entry(mode, &connector->modes, head) {
307 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
308 mode->name);
309 }
310 mutex_unlock(&connector->dev->mode_config.mutex);
311
312 return written;
313}
314
315static ssize_t connector_id_show(struct device *device,
316 struct device_attribute *attr,
317 char *buf)
318{
319 struct drm_connector *connector = to_drm_connector(device);
320
321 return sysfs_emit(buf, "%d\n", connector->base.id);
322}
323
324static DEVICE_ATTR_RW(status);
325static DEVICE_ATTR_RO(enabled);
326static DEVICE_ATTR_RO(dpms);
327static DEVICE_ATTR_RO(modes);
328static DEVICE_ATTR_RO(connector_id);
329
330static struct attribute *connector_dev_attrs[] = {
331 &dev_attr_status.attr,
332 &dev_attr_enabled.attr,
333 &dev_attr_dpms.attr,
334 &dev_attr_modes.attr,
335 &dev_attr_connector_id.attr,
336 NULL
337};
338
339static struct bin_attribute edid_attr = {
340 .attr.name = "edid",
341 .attr.mode = 0444,
342 .size = 0,
343 .read = edid_show,
344};
345
346static struct bin_attribute *connector_bin_attrs[] = {
347 &edid_attr,
348 NULL
349};
350
351static const struct attribute_group connector_dev_group = {
352 .attrs = connector_dev_attrs,
353 .bin_attrs = connector_bin_attrs,
354};
355
356static const struct attribute_group *connector_dev_groups[] = {
357 &connector_dev_group,
358 NULL
359};
360
361int drm_sysfs_connector_add(struct drm_connector *connector)
362{
363 struct drm_device *dev = connector->dev;
364 struct device *kdev;
365 int r;
366
367 if (connector->kdev)
368 return 0;
369
370 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
371 if (!kdev)
372 return -ENOMEM;
373
374 device_initialize(kdev);
375 kdev->class = drm_class;
376 kdev->type = &drm_sysfs_device_connector;
377 kdev->parent = dev->primary->kdev;
378 kdev->groups = connector_dev_groups;
379 kdev->release = drm_sysfs_release;
380 dev_set_drvdata(kdev, connector);
381
382 r = dev_set_name(kdev, "card%d-%s", dev->primary->index, connector->name);
383 if (r)
384 goto err_free;
385
386 DRM_DEBUG("adding \"%s\" to sysfs\n",
387 connector->name);
388
389 r = device_add(kdev);
390 if (r) {
391 drm_err(dev, "failed to register connector device: %d\n", r);
392 goto err_free;
393 }
394
395 connector->kdev = kdev;
396
397 if (dev_fwnode(kdev)) {
398 r = component_add(kdev, &typec_connector_ops);
399 if (r)
400 drm_err(dev, "failed to add component to create link to typec connector\n");
401 }
402
403 return 0;
404
405err_free:
406 put_device(kdev);
407 return r;
408}
409
410int drm_sysfs_connector_add_late(struct drm_connector *connector)
411{
412 if (connector->ddc)
413 return sysfs_create_link(&connector->kdev->kobj,
414 &connector->ddc->dev.kobj, "ddc");
415
416 return 0;
417}
418
419void drm_sysfs_connector_remove_early(struct drm_connector *connector)
420{
421 if (connector->ddc)
422 sysfs_remove_link(&connector->kdev->kobj, "ddc");
423}
424
425void drm_sysfs_connector_remove(struct drm_connector *connector)
426{
427 if (!connector->kdev)
428 return;
429
430 if (dev_fwnode(connector->kdev))
431 component_del(connector->kdev, &typec_connector_ops);
432
433 DRM_DEBUG("removing \"%s\" from sysfs\n",
434 connector->name);
435
436 device_unregister(connector->kdev);
437 connector->kdev = NULL;
438}
439
440void drm_sysfs_lease_event(struct drm_device *dev)
441{
442 char *event_string = "LEASE=1";
443 char *envp[] = { event_string, NULL };
444
445 DRM_DEBUG("generating lease event\n");
446
447 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
448}
449
450/**
451 * drm_sysfs_hotplug_event - generate a DRM uevent
452 * @dev: DRM device
453 *
454 * Send a uevent for the DRM device specified by @dev. Currently we only
455 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
456 * deal with other types of events.
457 *
458 * Any new uapi should be using the drm_sysfs_connector_status_event()
459 * for uevents on connector status change.
460 */
461void drm_sysfs_hotplug_event(struct drm_device *dev)
462{
463 char *event_string = "HOTPLUG=1";
464 char *envp[] = { event_string, NULL };
465
466 DRM_DEBUG("generating hotplug event\n");
467
468 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
469}
470EXPORT_SYMBOL(drm_sysfs_hotplug_event);
471
472/**
473 * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
474 * change
475 * @connector: connector which has changed
476 *
477 * Send a uevent for the DRM connector specified by @connector. This will send
478 * a uevent with the properties HOTPLUG=1 and CONNECTOR.
479 */
480void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
481{
482 struct drm_device *dev = connector->dev;
483 char hotplug_str[] = "HOTPLUG=1", conn_id[21];
484 char *envp[] = { hotplug_str, conn_id, NULL };
485
486 snprintf(conn_id, sizeof(conn_id),
487 "CONNECTOR=%u", connector->base.id);
488
489 drm_dbg_kms(connector->dev,
490 "[CONNECTOR:%d:%s] generating connector hotplug event\n",
491 connector->base.id, connector->name);
492
493 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
494}
495EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);
496
497/**
498 * drm_sysfs_connector_property_event - generate a DRM uevent for connector
499 * property change
500 * @connector: connector on which property changed
501 * @property: connector property which has changed.
502 *
503 * Send a uevent for the specified DRM connector and property. Currently we
504 * set HOTPLUG=1 and connector id along with the attached property id
505 * related to the change.
506 */
507void drm_sysfs_connector_property_event(struct drm_connector *connector,
508 struct drm_property *property)
509{
510 struct drm_device *dev = connector->dev;
511 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
512 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
513
514 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
515 property->base.id));
516
517 snprintf(conn_id, ARRAY_SIZE(conn_id),
518 "CONNECTOR=%u", connector->base.id);
519 snprintf(prop_id, ARRAY_SIZE(prop_id),
520 "PROPERTY=%u", property->base.id);
521
522 drm_dbg_kms(connector->dev,
523 "[CONNECTOR:%d:%s] generating connector property event for [PROP:%d:%s]\n",
524 connector->base.id, connector->name,
525 property->base.id, property->name);
526
527 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
528}
529EXPORT_SYMBOL(drm_sysfs_connector_property_event);
530
531struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
532{
533 const char *minor_str;
534 struct device *kdev;
535 int r;
536
537 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
538 if (!kdev)
539 return ERR_PTR(-ENOMEM);
540
541 device_initialize(kdev);
542
543 if (minor->type == DRM_MINOR_ACCEL) {
544 minor_str = "accel%d";
545 accel_set_device_instance_params(kdev, minor->index);
546 } else {
547 if (minor->type == DRM_MINOR_RENDER)
548 minor_str = "renderD%d";
549 else
550 minor_str = "card%d";
551
552 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
553 kdev->class = drm_class;
554 kdev->type = &drm_sysfs_device_minor;
555 }
556
557 kdev->parent = minor->dev->dev;
558 kdev->release = drm_sysfs_release;
559 dev_set_drvdata(kdev, minor);
560
561 r = dev_set_name(kdev, minor_str, minor->index);
562 if (r < 0)
563 goto err_free;
564
565 return kdev;
566
567err_free:
568 put_device(kdev);
569 return ERR_PTR(r);
570}
571
572/**
573 * drm_class_device_register - register new device with the DRM sysfs class
574 * @dev: device to register
575 *
576 * Registers a new &struct device within the DRM sysfs class. Essentially only
577 * used by ttm to have a place for its global settings. Drivers should never use
578 * this.
579 */
580int drm_class_device_register(struct device *dev)
581{
582 if (!drm_class || IS_ERR(drm_class))
583 return -ENOENT;
584
585 dev->class = drm_class;
586 return device_register(dev);
587}
588EXPORT_SYMBOL_GPL(drm_class_device_register);
589
590/**
591 * drm_class_device_unregister - unregister device with the DRM sysfs class
592 * @dev: device to unregister
593 *
594 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
595 * by ttm to have a place for its global settings. Drivers should never use
596 * this.
597 */
598void drm_class_device_unregister(struct device *dev)
599{
600 return device_unregister(dev);
601}
602EXPORT_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/drm_core.h>
23#include <drm/drmP.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
32/**
33 * __drm_class_suspend - internal DRM class suspend routine
34 * @dev: Linux device to suspend
35 * @state: power state to enter
36 *
37 * Just figures out what the actual struct drm_device associated with
38 * @dev is and calls its suspend hook, if present.
39 */
40static int __drm_class_suspend(struct device *dev, pm_message_t state)
41{
42 if (dev->type == &drm_sysfs_device_minor) {
43 struct drm_minor *drm_minor = to_drm_minor(dev);
44 struct drm_device *drm_dev = drm_minor->dev;
45
46 if (drm_minor->type == DRM_MINOR_LEGACY &&
47 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
48 drm_dev->driver->suspend)
49 return drm_dev->driver->suspend(drm_dev, state);
50 }
51 return 0;
52}
53
54/**
55 * drm_class_suspend - internal DRM class suspend hook. Simply calls
56 * __drm_class_suspend() with the correct pm state.
57 * @dev: Linux device to suspend
58 */
59static int drm_class_suspend(struct device *dev)
60{
61 return __drm_class_suspend(dev, PMSG_SUSPEND);
62}
63
64/**
65 * drm_class_freeze - internal DRM class freeze hook. Simply calls
66 * __drm_class_suspend() with the correct pm state.
67 * @dev: Linux device to freeze
68 */
69static int drm_class_freeze(struct device *dev)
70{
71 return __drm_class_suspend(dev, PMSG_FREEZE);
72}
73
74/**
75 * drm_class_resume - DRM class resume hook
76 * @dev: Linux device to resume
77 *
78 * Just figures out what the actual struct drm_device associated with
79 * @dev is and calls its resume hook, if present.
80 */
81static int drm_class_resume(struct device *dev)
82{
83 if (dev->type == &drm_sysfs_device_minor) {
84 struct drm_minor *drm_minor = to_drm_minor(dev);
85 struct drm_device *drm_dev = drm_minor->dev;
86
87 if (drm_minor->type == DRM_MINOR_LEGACY &&
88 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
89 drm_dev->driver->resume)
90 return drm_dev->driver->resume(drm_dev);
91 }
92 return 0;
93}
94
95static const struct dev_pm_ops drm_class_dev_pm_ops = {
96 .suspend = drm_class_suspend,
97 .resume = drm_class_resume,
98 .freeze = drm_class_freeze,
99};
100
101static char *drm_devnode(struct device *dev, umode_t *mode)
102{
103 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
104}
105
106static CLASS_ATTR_STRING(version, S_IRUGO,
107 CORE_NAME " "
108 __stringify(CORE_MAJOR) "."
109 __stringify(CORE_MINOR) "."
110 __stringify(CORE_PATCHLEVEL) " "
111 CORE_DATE);
112
113/**
114 * drm_sysfs_create - create a struct drm_sysfs_class structure
115 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
116 * @name: pointer to a string for the name of this class.
117 *
118 * This is used to create DRM class pointer that can then be used
119 * in calls to drm_sysfs_device_add().
120 *
121 * Note, the pointer created here is to be destroyed when finished by making a
122 * call to drm_sysfs_destroy().
123 */
124struct class *drm_sysfs_create(struct module *owner, char *name)
125{
126 struct class *class;
127 int err;
128
129 class = class_create(owner, name);
130 if (IS_ERR(class)) {
131 err = PTR_ERR(class);
132 goto err_out;
133 }
134
135 class->pm = &drm_class_dev_pm_ops;
136
137 err = class_create_file(class, &class_attr_version.attr);
138 if (err)
139 goto err_out_class;
140
141 class->devnode = drm_devnode;
142
143 return class;
144
145err_out_class:
146 class_destroy(class);
147err_out:
148 return ERR_PTR(err);
149}
150
151/**
152 * drm_sysfs_destroy - destroys DRM class
153 *
154 * Destroy the DRM device class.
155 */
156void drm_sysfs_destroy(void)
157{
158 if ((drm_class == NULL) || (IS_ERR(drm_class)))
159 return;
160 class_remove_file(drm_class, &class_attr_version.attr);
161 class_destroy(drm_class);
162 drm_class = NULL;
163}
164
165/*
166 * Connector properties
167 */
168static ssize_t status_show(struct device *device,
169 struct device_attribute *attr,
170 char *buf)
171{
172 struct drm_connector *connector = to_drm_connector(device);
173 enum drm_connector_status status;
174 int ret;
175
176 ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
177 if (ret)
178 return ret;
179
180 status = connector->funcs->detect(connector, true);
181 mutex_unlock(&connector->dev->mode_config.mutex);
182
183 return snprintf(buf, PAGE_SIZE, "%s\n",
184 drm_get_connector_status_name(status));
185}
186
187static ssize_t dpms_show(struct device *device,
188 struct device_attribute *attr,
189 char *buf)
190{
191 struct drm_connector *connector = to_drm_connector(device);
192 struct drm_device *dev = connector->dev;
193 uint64_t dpms_status;
194 int ret;
195
196 ret = drm_object_property_get_value(&connector->base,
197 dev->mode_config.dpms_property,
198 &dpms_status);
199 if (ret)
200 return 0;
201
202 return snprintf(buf, PAGE_SIZE, "%s\n",
203 drm_get_dpms_name((int)dpms_status));
204}
205
206static ssize_t enabled_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", connector->encoder ? "enabled" :
213 "disabled");
214}
215
216static ssize_t edid_show(struct file *filp, struct kobject *kobj,
217 struct bin_attribute *attr, char *buf, loff_t off,
218 size_t count)
219{
220 struct device *connector_dev = container_of(kobj, struct device, kobj);
221 struct drm_connector *connector = to_drm_connector(connector_dev);
222 unsigned char *edid;
223 size_t size;
224
225 if (!connector->edid_blob_ptr)
226 return 0;
227
228 edid = connector->edid_blob_ptr->data;
229 size = connector->edid_blob_ptr->length;
230 if (!edid)
231 return 0;
232
233 if (off >= size)
234 return 0;
235
236 if (off + count > size)
237 count = size - off;
238 memcpy(buf, edid + off, count);
239
240 return count;
241}
242
243static ssize_t modes_show(struct device *device,
244 struct device_attribute *attr,
245 char *buf)
246{
247 struct drm_connector *connector = to_drm_connector(device);
248 struct drm_display_mode *mode;
249 int written = 0;
250
251 list_for_each_entry(mode, &connector->modes, head) {
252 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
253 mode->name);
254 }
255
256 return written;
257}
258
259static ssize_t subconnector_show(struct device *device,
260 struct device_attribute *attr,
261 char *buf)
262{
263 struct drm_connector *connector = to_drm_connector(device);
264 struct drm_device *dev = connector->dev;
265 struct drm_property *prop = NULL;
266 uint64_t subconnector;
267 int is_tv = 0;
268 int ret;
269
270 switch (connector->connector_type) {
271 case DRM_MODE_CONNECTOR_DVII:
272 prop = dev->mode_config.dvi_i_subconnector_property;
273 break;
274 case DRM_MODE_CONNECTOR_Composite:
275 case DRM_MODE_CONNECTOR_SVIDEO:
276 case DRM_MODE_CONNECTOR_Component:
277 case DRM_MODE_CONNECTOR_TV:
278 prop = dev->mode_config.tv_subconnector_property;
279 is_tv = 1;
280 break;
281 default:
282 DRM_ERROR("Wrong connector type for this property\n");
283 return 0;
284 }
285
286 if (!prop) {
287 DRM_ERROR("Unable to find subconnector property\n");
288 return 0;
289 }
290
291 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
292 if (ret)
293 return 0;
294
295 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
296 drm_get_tv_subconnector_name((int)subconnector) :
297 drm_get_dvi_i_subconnector_name((int)subconnector));
298}
299
300static ssize_t select_subconnector_show(struct device *device,
301 struct device_attribute *attr,
302 char *buf)
303{
304 struct drm_connector *connector = to_drm_connector(device);
305 struct drm_device *dev = connector->dev;
306 struct drm_property *prop = NULL;
307 uint64_t subconnector;
308 int is_tv = 0;
309 int ret;
310
311 switch (connector->connector_type) {
312 case DRM_MODE_CONNECTOR_DVII:
313 prop = dev->mode_config.dvi_i_select_subconnector_property;
314 break;
315 case DRM_MODE_CONNECTOR_Composite:
316 case DRM_MODE_CONNECTOR_SVIDEO:
317 case DRM_MODE_CONNECTOR_Component:
318 case DRM_MODE_CONNECTOR_TV:
319 prop = dev->mode_config.tv_select_subconnector_property;
320 is_tv = 1;
321 break;
322 default:
323 DRM_ERROR("Wrong connector type for this property\n");
324 return 0;
325 }
326
327 if (!prop) {
328 DRM_ERROR("Unable to find select subconnector property\n");
329 return 0;
330 }
331
332 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
333 if (ret)
334 return 0;
335
336 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
337 drm_get_tv_select_name((int)subconnector) :
338 drm_get_dvi_i_select_name((int)subconnector));
339}
340
341static struct device_attribute connector_attrs[] = {
342 __ATTR_RO(status),
343 __ATTR_RO(enabled),
344 __ATTR_RO(dpms),
345 __ATTR_RO(modes),
346};
347
348/* These attributes are for both DVI-I connectors and all types of tv-out. */
349static struct device_attribute connector_attrs_opt1[] = {
350 __ATTR_RO(subconnector),
351 __ATTR_RO(select_subconnector),
352};
353
354static struct bin_attribute edid_attr = {
355 .attr.name = "edid",
356 .attr.mode = 0444,
357 .size = 0,
358 .read = edid_show,
359};
360
361/**
362 * drm_sysfs_connector_add - add a connector to sysfs
363 * @connector: connector to add
364 *
365 * Create a connector device in sysfs, along with its associated connector
366 * properties (so far, connection status, dpms, mode list & edid) and
367 * generate a hotplug event so userspace knows there's a new connector
368 * available.
369 */
370int drm_sysfs_connector_add(struct drm_connector *connector)
371{
372 struct drm_device *dev = connector->dev;
373 int attr_cnt = 0;
374 int opt_cnt = 0;
375 int i;
376 int ret;
377
378 if (connector->kdev)
379 return 0;
380
381 connector->kdev = device_create(drm_class, dev->primary->kdev,
382 0, connector, "card%d-%s",
383 dev->primary->index, drm_get_connector_name(connector));
384 DRM_DEBUG("adding \"%s\" to sysfs\n",
385 drm_get_connector_name(connector));
386
387 if (IS_ERR(connector->kdev)) {
388 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
389 ret = PTR_ERR(connector->kdev);
390 goto out;
391 }
392
393 /* Standard attributes */
394
395 for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
396 ret = device_create_file(connector->kdev, &connector_attrs[attr_cnt]);
397 if (ret)
398 goto err_out_files;
399 }
400
401 /* Optional attributes */
402 /*
403 * In the long run it maybe a good idea to make one set of
404 * optionals per connector type.
405 */
406 switch (connector->connector_type) {
407 case DRM_MODE_CONNECTOR_DVII:
408 case DRM_MODE_CONNECTOR_Composite:
409 case DRM_MODE_CONNECTOR_SVIDEO:
410 case DRM_MODE_CONNECTOR_Component:
411 case DRM_MODE_CONNECTOR_TV:
412 for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
413 ret = device_create_file(connector->kdev, &connector_attrs_opt1[opt_cnt]);
414 if (ret)
415 goto err_out_files;
416 }
417 break;
418 default:
419 break;
420 }
421
422 ret = sysfs_create_bin_file(&connector->kdev->kobj, &edid_attr);
423 if (ret)
424 goto err_out_files;
425
426 /* Let userspace know we have a new connector */
427 drm_sysfs_hotplug_event(dev);
428
429 return 0;
430
431err_out_files:
432 for (i = 0; i < opt_cnt; i++)
433 device_remove_file(connector->kdev, &connector_attrs_opt1[i]);
434 for (i = 0; i < attr_cnt; i++)
435 device_remove_file(connector->kdev, &connector_attrs[i]);
436 device_unregister(connector->kdev);
437
438out:
439 return ret;
440}
441EXPORT_SYMBOL(drm_sysfs_connector_add);
442
443/**
444 * drm_sysfs_connector_remove - remove an connector device from sysfs
445 * @connector: connector to remove
446 *
447 * Remove @connector and its associated attributes from sysfs. Note that
448 * the device model core will take care of sending the "remove" uevent
449 * at this time, so we don't need to do it.
450 *
451 * Note:
452 * This routine should only be called if the connector was previously
453 * successfully registered. If @connector hasn't been registered yet,
454 * you'll likely see a panic somewhere deep in sysfs code when called.
455 */
456void drm_sysfs_connector_remove(struct drm_connector *connector)
457{
458 int i;
459
460 if (!connector->kdev)
461 return;
462 DRM_DEBUG("removing \"%s\" from sysfs\n",
463 drm_get_connector_name(connector));
464
465 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
466 device_remove_file(connector->kdev, &connector_attrs[i]);
467 sysfs_remove_bin_file(&connector->kdev->kobj, &edid_attr);
468 device_unregister(connector->kdev);
469 connector->kdev = NULL;
470}
471EXPORT_SYMBOL(drm_sysfs_connector_remove);
472
473/**
474 * drm_sysfs_hotplug_event - generate a DRM uevent
475 * @dev: DRM device
476 *
477 * Send a uevent for the DRM device specified by @dev. Currently we only
478 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
479 * deal with other types of events.
480 */
481void drm_sysfs_hotplug_event(struct drm_device *dev)
482{
483 char *event_string = "HOTPLUG=1";
484 char *envp[] = { event_string, NULL };
485
486 DRM_DEBUG("generating hotplug event\n");
487
488 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
489}
490EXPORT_SYMBOL(drm_sysfs_hotplug_event);
491
492static void drm_sysfs_release(struct device *dev)
493{
494 kfree(dev);
495}
496
497/**
498 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
499 * @dev: DRM device to be added
500 * @head: DRM head in question
501 *
502 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
503 * as the parent for the Linux device, and make sure it has a file containing
504 * the driver we're using (for userspace compatibility).
505 */
506int drm_sysfs_device_add(struct drm_minor *minor)
507{
508 char *minor_str;
509 int r;
510
511 if (minor->type == DRM_MINOR_CONTROL)
512 minor_str = "controlD%d";
513 else if (minor->type == DRM_MINOR_RENDER)
514 minor_str = "renderD%d";
515 else
516 minor_str = "card%d";
517
518 minor->kdev = kzalloc(sizeof(*minor->kdev), GFP_KERNEL);
519 if (!minor->kdev) {
520 r = -ENOMEM;
521 goto error;
522 }
523
524 device_initialize(minor->kdev);
525 minor->kdev->devt = MKDEV(DRM_MAJOR, minor->index);
526 minor->kdev->class = drm_class;
527 minor->kdev->type = &drm_sysfs_device_minor;
528 minor->kdev->parent = minor->dev->dev;
529 minor->kdev->release = drm_sysfs_release;
530 dev_set_drvdata(minor->kdev, minor);
531
532 r = dev_set_name(minor->kdev, minor_str, minor->index);
533 if (r < 0)
534 goto error;
535
536 r = device_add(minor->kdev);
537 if (r < 0)
538 goto error;
539
540 return 0;
541
542error:
543 DRM_ERROR("device create failed %d\n", r);
544 put_device(minor->kdev);
545 return r;
546}
547
548/**
549 * drm_sysfs_device_remove - remove DRM device
550 * @dev: DRM device to remove
551 *
552 * This call unregisters and cleans up a class device that was created with a
553 * call to drm_sysfs_device_add()
554 */
555void drm_sysfs_device_remove(struct drm_minor *minor)
556{
557 if (minor->kdev)
558 device_unregister(minor->kdev);
559 minor->kdev = NULL;
560}
561
562
563/**
564 * drm_class_device_register - Register a struct device in the drm class.
565 *
566 * @dev: pointer to struct device to register.
567 *
568 * @dev should have all relevant members pre-filled with the exception
569 * of the class member. In particular, the device_type member must
570 * be set.
571 */
572
573int drm_class_device_register(struct device *dev)
574{
575 if (!drm_class || IS_ERR(drm_class))
576 return -ENOENT;
577
578 dev->class = drm_class;
579 return device_register(dev);
580}
581EXPORT_SYMBOL_GPL(drm_class_device_register);
582
583void drm_class_device_unregister(struct device *dev)
584{
585 return device_unregister(dev);
586}
587EXPORT_SYMBOL_GPL(drm_class_device_unregister);