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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
20#include "drm_sysfs.h"
21#include "drm_core.h"
22#include "drmP.h"
23
24#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
25#define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
26
27static struct device_type drm_sysfs_device_minor = {
28 .name = "drm_minor"
29};
30
31/**
32 * drm_class_suspend - DRM class suspend hook
33 * @dev: Linux device to suspend
34 * @state: power state to enter
35 *
36 * Just figures out what the actual struct drm_device associated with
37 * @dev is and calls its suspend hook, if present.
38 */
39static int drm_class_suspend(struct device *dev, pm_message_t state)
40{
41 if (dev->type == &drm_sysfs_device_minor) {
42 struct drm_minor *drm_minor = to_drm_minor(dev);
43 struct drm_device *drm_dev = drm_minor->dev;
44
45 if (drm_minor->type == DRM_MINOR_LEGACY &&
46 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
47 drm_dev->driver->suspend)
48 return drm_dev->driver->suspend(drm_dev, state);
49 }
50 return 0;
51}
52
53/**
54 * drm_class_resume - DRM class resume hook
55 * @dev: Linux device to resume
56 *
57 * Just figures out what the actual struct drm_device associated with
58 * @dev is and calls its resume hook, if present.
59 */
60static int drm_class_resume(struct device *dev)
61{
62 if (dev->type == &drm_sysfs_device_minor) {
63 struct drm_minor *drm_minor = to_drm_minor(dev);
64 struct drm_device *drm_dev = drm_minor->dev;
65
66 if (drm_minor->type == DRM_MINOR_LEGACY &&
67 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
68 drm_dev->driver->resume)
69 return drm_dev->driver->resume(drm_dev);
70 }
71 return 0;
72}
73
74static char *drm_devnode(struct device *dev, mode_t *mode)
75{
76 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
77}
78
79static CLASS_ATTR_STRING(version, S_IRUGO,
80 CORE_NAME " "
81 __stringify(CORE_MAJOR) "."
82 __stringify(CORE_MINOR) "."
83 __stringify(CORE_PATCHLEVEL) " "
84 CORE_DATE);
85
86/**
87 * drm_sysfs_create - create a struct drm_sysfs_class structure
88 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
89 * @name: pointer to a string for the name of this class.
90 *
91 * This is used to create DRM class pointer that can then be used
92 * in calls to drm_sysfs_device_add().
93 *
94 * Note, the pointer created here is to be destroyed when finished by making a
95 * call to drm_sysfs_destroy().
96 */
97struct class *drm_sysfs_create(struct module *owner, char *name)
98{
99 struct class *class;
100 int err;
101
102 class = class_create(owner, name);
103 if (IS_ERR(class)) {
104 err = PTR_ERR(class);
105 goto err_out;
106 }
107
108 class->suspend = drm_class_suspend;
109 class->resume = drm_class_resume;
110
111 err = class_create_file(class, &class_attr_version.attr);
112 if (err)
113 goto err_out_class;
114
115 class->devnode = drm_devnode;
116
117 return class;
118
119err_out_class:
120 class_destroy(class);
121err_out:
122 return ERR_PTR(err);
123}
124
125/**
126 * drm_sysfs_destroy - destroys DRM class
127 *
128 * Destroy the DRM device class.
129 */
130void drm_sysfs_destroy(void)
131{
132 if ((drm_class == NULL) || (IS_ERR(drm_class)))
133 return;
134 class_remove_file(drm_class, &class_attr_version.attr);
135 class_destroy(drm_class);
136}
137
138/**
139 * drm_sysfs_device_release - do nothing
140 * @dev: Linux device
141 *
142 * Normally, this would free the DRM device associated with @dev, along
143 * with cleaning up any other stuff. But we do that in the DRM core, so
144 * this function can just return and hope that the core does its job.
145 */
146static void drm_sysfs_device_release(struct device *dev)
147{
148 memset(dev, 0, sizeof(struct device));
149 return;
150}
151
152/*
153 * Connector properties
154 */
155static ssize_t status_show(struct device *device,
156 struct device_attribute *attr,
157 char *buf)
158{
159 struct drm_connector *connector = to_drm_connector(device);
160 enum drm_connector_status status;
161 int ret;
162
163 ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
164 if (ret)
165 return ret;
166
167 status = connector->funcs->detect(connector, true);
168 mutex_unlock(&connector->dev->mode_config.mutex);
169
170 return snprintf(buf, PAGE_SIZE, "%s\n",
171 drm_get_connector_status_name(status));
172}
173
174static ssize_t dpms_show(struct device *device,
175 struct device_attribute *attr,
176 char *buf)
177{
178 struct drm_connector *connector = to_drm_connector(device);
179 struct drm_device *dev = connector->dev;
180 uint64_t dpms_status;
181 int ret;
182
183 ret = drm_connector_property_get_value(connector,
184 dev->mode_config.dpms_property,
185 &dpms_status);
186 if (ret)
187 return 0;
188
189 return snprintf(buf, PAGE_SIZE, "%s\n",
190 drm_get_dpms_name((int)dpms_status));
191}
192
193static ssize_t enabled_show(struct device *device,
194 struct device_attribute *attr,
195 char *buf)
196{
197 struct drm_connector *connector = to_drm_connector(device);
198
199 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
200 "disabled");
201}
202
203static ssize_t edid_show(struct file *filp, struct kobject *kobj,
204 struct bin_attribute *attr, char *buf, loff_t off,
205 size_t count)
206{
207 struct device *connector_dev = container_of(kobj, struct device, kobj);
208 struct drm_connector *connector = to_drm_connector(connector_dev);
209 unsigned char *edid;
210 size_t size;
211
212 if (!connector->edid_blob_ptr)
213 return 0;
214
215 edid = connector->edid_blob_ptr->data;
216 size = connector->edid_blob_ptr->length;
217 if (!edid)
218 return 0;
219
220 if (off >= size)
221 return 0;
222
223 if (off + count > size)
224 count = size - off;
225 memcpy(buf, edid + off, count);
226
227 return count;
228}
229
230static ssize_t modes_show(struct device *device,
231 struct device_attribute *attr,
232 char *buf)
233{
234 struct drm_connector *connector = to_drm_connector(device);
235 struct drm_display_mode *mode;
236 int written = 0;
237
238 list_for_each_entry(mode, &connector->modes, head) {
239 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
240 mode->name);
241 }
242
243 return written;
244}
245
246static ssize_t subconnector_show(struct device *device,
247 struct device_attribute *attr,
248 char *buf)
249{
250 struct drm_connector *connector = to_drm_connector(device);
251 struct drm_device *dev = connector->dev;
252 struct drm_property *prop = NULL;
253 uint64_t subconnector;
254 int is_tv = 0;
255 int ret;
256
257 switch (connector->connector_type) {
258 case DRM_MODE_CONNECTOR_DVII:
259 prop = dev->mode_config.dvi_i_subconnector_property;
260 break;
261 case DRM_MODE_CONNECTOR_Composite:
262 case DRM_MODE_CONNECTOR_SVIDEO:
263 case DRM_MODE_CONNECTOR_Component:
264 case DRM_MODE_CONNECTOR_TV:
265 prop = dev->mode_config.tv_subconnector_property;
266 is_tv = 1;
267 break;
268 default:
269 DRM_ERROR("Wrong connector type for this property\n");
270 return 0;
271 }
272
273 if (!prop) {
274 DRM_ERROR("Unable to find subconnector property\n");
275 return 0;
276 }
277
278 ret = drm_connector_property_get_value(connector, prop, &subconnector);
279 if (ret)
280 return 0;
281
282 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
283 drm_get_tv_subconnector_name((int)subconnector) :
284 drm_get_dvi_i_subconnector_name((int)subconnector));
285}
286
287static ssize_t select_subconnector_show(struct device *device,
288 struct device_attribute *attr,
289 char *buf)
290{
291 struct drm_connector *connector = to_drm_connector(device);
292 struct drm_device *dev = connector->dev;
293 struct drm_property *prop = NULL;
294 uint64_t subconnector;
295 int is_tv = 0;
296 int ret;
297
298 switch (connector->connector_type) {
299 case DRM_MODE_CONNECTOR_DVII:
300 prop = dev->mode_config.dvi_i_select_subconnector_property;
301 break;
302 case DRM_MODE_CONNECTOR_Composite:
303 case DRM_MODE_CONNECTOR_SVIDEO:
304 case DRM_MODE_CONNECTOR_Component:
305 case DRM_MODE_CONNECTOR_TV:
306 prop = dev->mode_config.tv_select_subconnector_property;
307 is_tv = 1;
308 break;
309 default:
310 DRM_ERROR("Wrong connector type for this property\n");
311 return 0;
312 }
313
314 if (!prop) {
315 DRM_ERROR("Unable to find select subconnector property\n");
316 return 0;
317 }
318
319 ret = drm_connector_property_get_value(connector, prop, &subconnector);
320 if (ret)
321 return 0;
322
323 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
324 drm_get_tv_select_name((int)subconnector) :
325 drm_get_dvi_i_select_name((int)subconnector));
326}
327
328static struct device_attribute connector_attrs[] = {
329 __ATTR_RO(status),
330 __ATTR_RO(enabled),
331 __ATTR_RO(dpms),
332 __ATTR_RO(modes),
333};
334
335/* These attributes are for both DVI-I connectors and all types of tv-out. */
336static struct device_attribute connector_attrs_opt1[] = {
337 __ATTR_RO(subconnector),
338 __ATTR_RO(select_subconnector),
339};
340
341static struct bin_attribute edid_attr = {
342 .attr.name = "edid",
343 .attr.mode = 0444,
344 .size = 0,
345 .read = edid_show,
346};
347
348/**
349 * drm_sysfs_connector_add - add an connector to sysfs
350 * @connector: connector to add
351 *
352 * Create an connector device in sysfs, along with its associated connector
353 * properties (so far, connection status, dpms, mode list & edid) and
354 * generate a hotplug event so userspace knows there's a new connector
355 * available.
356 *
357 * Note:
358 * This routine should only be called *once* for each DRM minor registered.
359 * A second call for an already registered device will trigger the BUG_ON
360 * below.
361 */
362int drm_sysfs_connector_add(struct drm_connector *connector)
363{
364 struct drm_device *dev = connector->dev;
365 int attr_cnt = 0;
366 int opt_cnt = 0;
367 int i;
368 int ret = 0;
369
370 /* We shouldn't get called more than once for the same connector */
371 BUG_ON(device_is_registered(&connector->kdev));
372
373 connector->kdev.parent = &dev->primary->kdev;
374 connector->kdev.class = drm_class;
375 connector->kdev.release = drm_sysfs_device_release;
376
377 DRM_DEBUG("adding \"%s\" to sysfs\n",
378 drm_get_connector_name(connector));
379
380 dev_set_name(&connector->kdev, "card%d-%s",
381 dev->primary->index, drm_get_connector_name(connector));
382 ret = device_register(&connector->kdev);
383
384 if (ret) {
385 DRM_ERROR("failed to register connector device: %d\n", ret);
386 goto out;
387 }
388
389 /* Standard attributes */
390
391 for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
392 ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]);
393 if (ret)
394 goto err_out_files;
395 }
396
397 /* Optional attributes */
398 /*
399 * In the long run it maybe a good idea to make one set of
400 * optionals per connector type.
401 */
402 switch (connector->connector_type) {
403 case DRM_MODE_CONNECTOR_DVII:
404 case DRM_MODE_CONNECTOR_Composite:
405 case DRM_MODE_CONNECTOR_SVIDEO:
406 case DRM_MODE_CONNECTOR_Component:
407 case DRM_MODE_CONNECTOR_TV:
408 for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
409 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[opt_cnt]);
410 if (ret)
411 goto err_out_files;
412 }
413 break;
414 default:
415 break;
416 }
417
418 ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
419 if (ret)
420 goto err_out_files;
421
422 /* Let userspace know we have a new connector */
423 drm_sysfs_hotplug_event(dev);
424
425 return 0;
426
427err_out_files:
428 for (i = 0; i < opt_cnt; i++)
429 device_remove_file(&connector->kdev, &connector_attrs_opt1[i]);
430 for (i = 0; i < attr_cnt; i++)
431 device_remove_file(&connector->kdev, &connector_attrs[i]);
432 device_unregister(&connector->kdev);
433
434out:
435 return ret;
436}
437EXPORT_SYMBOL(drm_sysfs_connector_add);
438
439/**
440 * drm_sysfs_connector_remove - remove an connector device from sysfs
441 * @connector: connector to remove
442 *
443 * Remove @connector and its associated attributes from sysfs. Note that
444 * the device model core will take care of sending the "remove" uevent
445 * at this time, so we don't need to do it.
446 *
447 * Note:
448 * This routine should only be called if the connector was previously
449 * successfully registered. If @connector hasn't been registered yet,
450 * you'll likely see a panic somewhere deep in sysfs code when called.
451 */
452void drm_sysfs_connector_remove(struct drm_connector *connector)
453{
454 int i;
455
456 DRM_DEBUG("removing \"%s\" from sysfs\n",
457 drm_get_connector_name(connector));
458
459 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
460 device_remove_file(&connector->kdev, &connector_attrs[i]);
461 sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
462 device_unregister(&connector->kdev);
463}
464EXPORT_SYMBOL(drm_sysfs_connector_remove);
465
466/**
467 * drm_sysfs_hotplug_event - generate a DRM uevent
468 * @dev: DRM device
469 *
470 * Send a uevent for the DRM device specified by @dev. Currently we only
471 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
472 * deal with other types of events.
473 */
474void drm_sysfs_hotplug_event(struct drm_device *dev)
475{
476 char *event_string = "HOTPLUG=1";
477 char *envp[] = { event_string, NULL };
478
479 DRM_DEBUG("generating hotplug event\n");
480
481 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
482}
483EXPORT_SYMBOL(drm_sysfs_hotplug_event);
484
485/**
486 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
487 * @dev: DRM device to be added
488 * @head: DRM head in question
489 *
490 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
491 * as the parent for the Linux device, and make sure it has a file containing
492 * the driver we're using (for userspace compatibility).
493 */
494int drm_sysfs_device_add(struct drm_minor *minor)
495{
496 int err;
497 char *minor_str;
498
499 minor->kdev.parent = minor->dev->dev;
500
501 minor->kdev.class = drm_class;
502 minor->kdev.release = drm_sysfs_device_release;
503 minor->kdev.devt = minor->device;
504 minor->kdev.type = &drm_sysfs_device_minor;
505 if (minor->type == DRM_MINOR_CONTROL)
506 minor_str = "controlD%d";
507 else if (minor->type == DRM_MINOR_RENDER)
508 minor_str = "renderD%d";
509 else
510 minor_str = "card%d";
511
512 dev_set_name(&minor->kdev, minor_str, minor->index);
513
514 err = device_register(&minor->kdev);
515 if (err) {
516 DRM_ERROR("device add failed: %d\n", err);
517 goto err_out;
518 }
519
520 return 0;
521
522err_out:
523 return err;
524}
525
526/**
527 * drm_sysfs_device_remove - remove DRM device
528 * @dev: DRM device to remove
529 *
530 * This call unregisters and cleans up a class device that was created with a
531 * call to drm_sysfs_device_add()
532 */
533void drm_sysfs_device_remove(struct drm_minor *minor)
534{
535 device_unregister(&minor->kdev);
536}
537
538
539/**
540 * drm_class_device_register - Register a struct device in the drm class.
541 *
542 * @dev: pointer to struct device to register.
543 *
544 * @dev should have all relevant members pre-filled with the exception
545 * of the class member. In particular, the device_type member must
546 * be set.
547 */
548
549int drm_class_device_register(struct device *dev)
550{
551 dev->class = drm_class;
552 return device_register(dev);
553}
554EXPORT_SYMBOL_GPL(drm_class_device_register);
555
556void drm_class_device_unregister(struct device *dev)
557{
558 return device_unregister(dev);
559}
560EXPORT_SYMBOL_GPL(drm_class_device_unregister);
1// SPDX-License-Identifier: GPL-2.0-only
2
3/*
4 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
5 * extra sysfs attribute from DRM. Normal drm_sysfs_class
6 * does not allow adding attributes.
7 *
8 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
9 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
10 * Copyright (c) 2003-2004 IBM Corp.
11 */
12
13#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/export.h>
16#include <linux/gfp.h>
17#include <linux/i2c.h>
18#include <linux/kdev_t.h>
19#include <linux/slab.h>
20
21#include <drm/drm_connector.h>
22#include <drm/drm_device.h>
23#include <drm/drm_file.h>
24#include <drm/drm_modes.h>
25#include <drm/drm_print.h>
26#include <drm/drm_property.h>
27#include <drm/drm_sysfs.h>
28
29#include "drm_internal.h"
30#include "drm_crtc_internal.h"
31
32#define to_drm_minor(d) dev_get_drvdata(d)
33#define to_drm_connector(d) dev_get_drvdata(d)
34
35/**
36 * DOC: overview
37 *
38 * DRM provides very little additional support to drivers for sysfs
39 * interactions, beyond just all the standard stuff. Drivers who want to expose
40 * additional sysfs properties and property groups can attach them at either
41 * &drm_device.dev or &drm_connector.kdev.
42 *
43 * Registration is automatically handled when calling drm_dev_register(), or
44 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
45 * also automatically handled by drm_dev_unregister() and
46 * drm_connector_unregister().
47 */
48
49static struct device_type drm_sysfs_device_minor = {
50 .name = "drm_minor"
51};
52
53struct class *drm_class;
54
55static char *drm_devnode(struct device *dev, umode_t *mode)
56{
57 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
58}
59
60static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
61
62/**
63 * drm_sysfs_init - initialize sysfs helpers
64 *
65 * This is used to create the DRM class, which is the implicit parent of any
66 * other top-level DRM sysfs objects.
67 *
68 * You must call drm_sysfs_destroy() to release the allocated resources.
69 *
70 * Return: 0 on success, negative error code on failure.
71 */
72int drm_sysfs_init(void)
73{
74 int err;
75
76 drm_class = class_create(THIS_MODULE, "drm");
77 if (IS_ERR(drm_class))
78 return PTR_ERR(drm_class);
79
80 err = class_create_file(drm_class, &class_attr_version.attr);
81 if (err) {
82 class_destroy(drm_class);
83 drm_class = NULL;
84 return err;
85 }
86
87 drm_class->devnode = drm_devnode;
88 return 0;
89}
90
91/**
92 * drm_sysfs_destroy - destroys DRM class
93 *
94 * Destroy the DRM device class.
95 */
96void drm_sysfs_destroy(void)
97{
98 if (IS_ERR_OR_NULL(drm_class))
99 return;
100 class_remove_file(drm_class, &class_attr_version.attr);
101 class_destroy(drm_class);
102 drm_class = NULL;
103}
104
105/*
106 * Connector properties
107 */
108static ssize_t status_store(struct device *device,
109 struct device_attribute *attr,
110 const char *buf, size_t count)
111{
112 struct drm_connector *connector = to_drm_connector(device);
113 struct drm_device *dev = connector->dev;
114 enum drm_connector_force old_force;
115 int ret;
116
117 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
118 if (ret)
119 return ret;
120
121 old_force = connector->force;
122
123 if (sysfs_streq(buf, "detect"))
124 connector->force = 0;
125 else if (sysfs_streq(buf, "on"))
126 connector->force = DRM_FORCE_ON;
127 else if (sysfs_streq(buf, "on-digital"))
128 connector->force = DRM_FORCE_ON_DIGITAL;
129 else if (sysfs_streq(buf, "off"))
130 connector->force = DRM_FORCE_OFF;
131 else
132 ret = -EINVAL;
133
134 if (old_force != connector->force || !connector->force) {
135 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
136 connector->base.id,
137 connector->name,
138 old_force, connector->force);
139
140 connector->funcs->fill_modes(connector,
141 dev->mode_config.max_width,
142 dev->mode_config.max_height);
143 }
144
145 mutex_unlock(&dev->mode_config.mutex);
146
147 return ret ? ret : count;
148}
149
150static ssize_t status_show(struct device *device,
151 struct device_attribute *attr,
152 char *buf)
153{
154 struct drm_connector *connector = to_drm_connector(device);
155 enum drm_connector_status status;
156
157 status = READ_ONCE(connector->status);
158
159 return sysfs_emit(buf, "%s\n",
160 drm_get_connector_status_name(status));
161}
162
163static ssize_t dpms_show(struct device *device,
164 struct device_attribute *attr,
165 char *buf)
166{
167 struct drm_connector *connector = to_drm_connector(device);
168 int dpms;
169
170 dpms = READ_ONCE(connector->dpms);
171
172 return sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
173}
174
175static ssize_t enabled_show(struct device *device,
176 struct device_attribute *attr,
177 char *buf)
178{
179 struct drm_connector *connector = to_drm_connector(device);
180 bool enabled;
181
182 enabled = READ_ONCE(connector->encoder);
183
184 return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
185}
186
187static ssize_t edid_show(struct file *filp, struct kobject *kobj,
188 struct bin_attribute *attr, char *buf, loff_t off,
189 size_t count)
190{
191 struct device *connector_dev = kobj_to_dev(kobj);
192 struct drm_connector *connector = to_drm_connector(connector_dev);
193 unsigned char *edid;
194 size_t size;
195 ssize_t ret = 0;
196
197 mutex_lock(&connector->dev->mode_config.mutex);
198 if (!connector->edid_blob_ptr)
199 goto unlock;
200
201 edid = connector->edid_blob_ptr->data;
202 size = connector->edid_blob_ptr->length;
203 if (!edid)
204 goto unlock;
205
206 if (off >= size)
207 goto unlock;
208
209 if (off + count > size)
210 count = size - off;
211 memcpy(buf, edid + off, count);
212
213 ret = count;
214unlock:
215 mutex_unlock(&connector->dev->mode_config.mutex);
216
217 return ret;
218}
219
220static ssize_t modes_show(struct device *device,
221 struct device_attribute *attr,
222 char *buf)
223{
224 struct drm_connector *connector = to_drm_connector(device);
225 struct drm_display_mode *mode;
226 int written = 0;
227
228 mutex_lock(&connector->dev->mode_config.mutex);
229 list_for_each_entry(mode, &connector->modes, head) {
230 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
231 mode->name);
232 }
233 mutex_unlock(&connector->dev->mode_config.mutex);
234
235 return written;
236}
237
238static DEVICE_ATTR_RW(status);
239static DEVICE_ATTR_RO(enabled);
240static DEVICE_ATTR_RO(dpms);
241static DEVICE_ATTR_RO(modes);
242
243static struct attribute *connector_dev_attrs[] = {
244 &dev_attr_status.attr,
245 &dev_attr_enabled.attr,
246 &dev_attr_dpms.attr,
247 &dev_attr_modes.attr,
248 NULL
249};
250
251static struct bin_attribute edid_attr = {
252 .attr.name = "edid",
253 .attr.mode = 0444,
254 .size = 0,
255 .read = edid_show,
256};
257
258static struct bin_attribute *connector_bin_attrs[] = {
259 &edid_attr,
260 NULL
261};
262
263static const struct attribute_group connector_dev_group = {
264 .attrs = connector_dev_attrs,
265 .bin_attrs = connector_bin_attrs,
266};
267
268static const struct attribute_group *connector_dev_groups[] = {
269 &connector_dev_group,
270 NULL
271};
272
273int drm_sysfs_connector_add(struct drm_connector *connector)
274{
275 struct drm_device *dev = connector->dev;
276
277 if (connector->kdev)
278 return 0;
279
280 connector->kdev =
281 device_create_with_groups(drm_class, dev->primary->kdev, 0,
282 connector, connector_dev_groups,
283 "card%d-%s", dev->primary->index,
284 connector->name);
285 DRM_DEBUG("adding \"%s\" to sysfs\n",
286 connector->name);
287
288 if (IS_ERR(connector->kdev)) {
289 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
290 return PTR_ERR(connector->kdev);
291 }
292
293 if (connector->ddc)
294 return sysfs_create_link(&connector->kdev->kobj,
295 &connector->ddc->dev.kobj, "ddc");
296 return 0;
297}
298
299void drm_sysfs_connector_remove(struct drm_connector *connector)
300{
301 if (!connector->kdev)
302 return;
303
304 if (connector->ddc)
305 sysfs_remove_link(&connector->kdev->kobj, "ddc");
306
307 DRM_DEBUG("removing \"%s\" from sysfs\n",
308 connector->name);
309
310 device_unregister(connector->kdev);
311 connector->kdev = NULL;
312}
313
314void drm_sysfs_lease_event(struct drm_device *dev)
315{
316 char *event_string = "LEASE=1";
317 char *envp[] = { event_string, NULL };
318
319 DRM_DEBUG("generating lease event\n");
320
321 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
322}
323
324/**
325 * drm_sysfs_hotplug_event - generate a DRM uevent
326 * @dev: DRM device
327 *
328 * Send a uevent for the DRM device specified by @dev. Currently we only
329 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
330 * deal with other types of events.
331 *
332 * Any new uapi should be using the drm_sysfs_connector_status_event()
333 * for uevents on connector status change.
334 */
335void drm_sysfs_hotplug_event(struct drm_device *dev)
336{
337 char *event_string = "HOTPLUG=1";
338 char *envp[] = { event_string, NULL };
339
340 DRM_DEBUG("generating hotplug event\n");
341
342 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
343}
344EXPORT_SYMBOL(drm_sysfs_hotplug_event);
345
346/**
347 * drm_sysfs_connector_status_event - generate a DRM uevent for connector
348 * property status change
349 * @connector: connector on which property status changed
350 * @property: connector property whose status changed.
351 *
352 * Send a uevent for the DRM device specified by @dev. Currently we
353 * set HOTPLUG=1 and connector id along with the attached property id
354 * related to the status change.
355 */
356void drm_sysfs_connector_status_event(struct drm_connector *connector,
357 struct drm_property *property)
358{
359 struct drm_device *dev = connector->dev;
360 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
361 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
362
363 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
364 property->base.id));
365
366 snprintf(conn_id, ARRAY_SIZE(conn_id),
367 "CONNECTOR=%u", connector->base.id);
368 snprintf(prop_id, ARRAY_SIZE(prop_id),
369 "PROPERTY=%u", property->base.id);
370
371 DRM_DEBUG("generating connector status event\n");
372
373 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
374}
375EXPORT_SYMBOL(drm_sysfs_connector_status_event);
376
377static void drm_sysfs_release(struct device *dev)
378{
379 kfree(dev);
380}
381
382struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
383{
384 const char *minor_str;
385 struct device *kdev;
386 int r;
387
388 if (minor->type == DRM_MINOR_RENDER)
389 minor_str = "renderD%d";
390 else
391 minor_str = "card%d";
392
393 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
394 if (!kdev)
395 return ERR_PTR(-ENOMEM);
396
397 device_initialize(kdev);
398 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
399 kdev->class = drm_class;
400 kdev->type = &drm_sysfs_device_minor;
401 kdev->parent = minor->dev->dev;
402 kdev->release = drm_sysfs_release;
403 dev_set_drvdata(kdev, minor);
404
405 r = dev_set_name(kdev, minor_str, minor->index);
406 if (r < 0)
407 goto err_free;
408
409 return kdev;
410
411err_free:
412 put_device(kdev);
413 return ERR_PTR(r);
414}
415
416/**
417 * drm_class_device_register - register new device with the DRM sysfs class
418 * @dev: device to register
419 *
420 * Registers a new &struct device within the DRM sysfs class. Essentially only
421 * used by ttm to have a place for its global settings. Drivers should never use
422 * this.
423 */
424int drm_class_device_register(struct device *dev)
425{
426 if (!drm_class || IS_ERR(drm_class))
427 return -ENOENT;
428
429 dev->class = drm_class;
430 return device_register(dev);
431}
432EXPORT_SYMBOL_GPL(drm_class_device_register);
433
434/**
435 * drm_class_device_unregister - unregister device with the DRM sysfs class
436 * @dev: device to unregister
437 *
438 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
439 * by ttm to have a place for its global settings. Drivers should never use
440 * this.
441 */
442void drm_class_device_unregister(struct device *dev)
443{
444 return device_unregister(dev);
445}
446EXPORT_SYMBOL_GPL(drm_class_device_unregister);