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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 drm_setup_hdcp_srm(drm_class);
89 return 0;
90}
91
92/**
93 * drm_sysfs_destroy - destroys DRM class
94 *
95 * Destroy the DRM device class.
96 */
97void drm_sysfs_destroy(void)
98{
99 if (IS_ERR_OR_NULL(drm_class))
100 return;
101 drm_teardown_hdcp_srm(drm_class);
102 class_remove_file(drm_class, &class_attr_version.attr);
103 class_destroy(drm_class);
104 drm_class = NULL;
105}
106
107/*
108 * Connector properties
109 */
110static ssize_t status_store(struct device *device,
111 struct device_attribute *attr,
112 const char *buf, size_t count)
113{
114 struct drm_connector *connector = to_drm_connector(device);
115 struct drm_device *dev = connector->dev;
116 enum drm_connector_force old_force;
117 int ret;
118
119 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
120 if (ret)
121 return ret;
122
123 old_force = connector->force;
124
125 if (sysfs_streq(buf, "detect"))
126 connector->force = 0;
127 else if (sysfs_streq(buf, "on"))
128 connector->force = DRM_FORCE_ON;
129 else if (sysfs_streq(buf, "on-digital"))
130 connector->force = DRM_FORCE_ON_DIGITAL;
131 else if (sysfs_streq(buf, "off"))
132 connector->force = DRM_FORCE_OFF;
133 else
134 ret = -EINVAL;
135
136 if (old_force != connector->force || !connector->force) {
137 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
138 connector->base.id,
139 connector->name,
140 old_force, connector->force);
141
142 connector->funcs->fill_modes(connector,
143 dev->mode_config.max_width,
144 dev->mode_config.max_height);
145 }
146
147 mutex_unlock(&dev->mode_config.mutex);
148
149 return ret ? ret : count;
150}
151
152static ssize_t status_show(struct device *device,
153 struct device_attribute *attr,
154 char *buf)
155{
156 struct drm_connector *connector = to_drm_connector(device);
157 enum drm_connector_status status;
158
159 status = READ_ONCE(connector->status);
160
161 return snprintf(buf, PAGE_SIZE, "%s\n",
162 drm_get_connector_status_name(status));
163}
164
165static ssize_t dpms_show(struct device *device,
166 struct device_attribute *attr,
167 char *buf)
168{
169 struct drm_connector *connector = to_drm_connector(device);
170 int dpms;
171
172 dpms = READ_ONCE(connector->dpms);
173
174 return snprintf(buf, PAGE_SIZE, "%s\n",
175 drm_get_dpms_name(dpms));
176}
177
178static ssize_t enabled_show(struct device *device,
179 struct device_attribute *attr,
180 char *buf)
181{
182 struct drm_connector *connector = to_drm_connector(device);
183 bool enabled;
184
185 enabled = READ_ONCE(connector->encoder);
186
187 return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
188}
189
190static ssize_t edid_show(struct file *filp, struct kobject *kobj,
191 struct bin_attribute *attr, char *buf, loff_t off,
192 size_t count)
193{
194 struct device *connector_dev = kobj_to_dev(kobj);
195 struct drm_connector *connector = to_drm_connector(connector_dev);
196 unsigned char *edid;
197 size_t size;
198 ssize_t ret = 0;
199
200 mutex_lock(&connector->dev->mode_config.mutex);
201 if (!connector->edid_blob_ptr)
202 goto unlock;
203
204 edid = connector->edid_blob_ptr->data;
205 size = connector->edid_blob_ptr->length;
206 if (!edid)
207 goto unlock;
208
209 if (off >= size)
210 goto unlock;
211
212 if (off + count > size)
213 count = size - off;
214 memcpy(buf, edid + off, count);
215
216 ret = count;
217unlock:
218 mutex_unlock(&connector->dev->mode_config.mutex);
219
220 return ret;
221}
222
223static ssize_t modes_show(struct device *device,
224 struct device_attribute *attr,
225 char *buf)
226{
227 struct drm_connector *connector = to_drm_connector(device);
228 struct drm_display_mode *mode;
229 int written = 0;
230
231 mutex_lock(&connector->dev->mode_config.mutex);
232 list_for_each_entry(mode, &connector->modes, head) {
233 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
234 mode->name);
235 }
236 mutex_unlock(&connector->dev->mode_config.mutex);
237
238 return written;
239}
240
241static DEVICE_ATTR_RW(status);
242static DEVICE_ATTR_RO(enabled);
243static DEVICE_ATTR_RO(dpms);
244static DEVICE_ATTR_RO(modes);
245
246static struct attribute *connector_dev_attrs[] = {
247 &dev_attr_status.attr,
248 &dev_attr_enabled.attr,
249 &dev_attr_dpms.attr,
250 &dev_attr_modes.attr,
251 NULL
252};
253
254static struct bin_attribute edid_attr = {
255 .attr.name = "edid",
256 .attr.mode = 0444,
257 .size = 0,
258 .read = edid_show,
259};
260
261static struct bin_attribute *connector_bin_attrs[] = {
262 &edid_attr,
263 NULL
264};
265
266static const struct attribute_group connector_dev_group = {
267 .attrs = connector_dev_attrs,
268 .bin_attrs = connector_bin_attrs,
269};
270
271static const struct attribute_group *connector_dev_groups[] = {
272 &connector_dev_group,
273 NULL
274};
275
276int drm_sysfs_connector_add(struct drm_connector *connector)
277{
278 struct drm_device *dev = connector->dev;
279
280 if (connector->kdev)
281 return 0;
282
283 connector->kdev =
284 device_create_with_groups(drm_class, dev->primary->kdev, 0,
285 connector, connector_dev_groups,
286 "card%d-%s", dev->primary->index,
287 connector->name);
288 DRM_DEBUG("adding \"%s\" to sysfs\n",
289 connector->name);
290
291 if (IS_ERR(connector->kdev)) {
292 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
293 return PTR_ERR(connector->kdev);
294 }
295
296 /* Let userspace know we have a new connector */
297 drm_sysfs_hotplug_event(dev);
298
299 if (connector->ddc)
300 return sysfs_create_link(&connector->kdev->kobj,
301 &connector->ddc->dev.kobj, "ddc");
302 return 0;
303}
304
305void drm_sysfs_connector_remove(struct drm_connector *connector)
306{
307 if (!connector->kdev)
308 return;
309
310 if (connector->ddc)
311 sysfs_remove_link(&connector->kdev->kobj, "ddc");
312
313 DRM_DEBUG("removing \"%s\" from sysfs\n",
314 connector->name);
315
316 device_unregister(connector->kdev);
317 connector->kdev = NULL;
318}
319
320void drm_sysfs_lease_event(struct drm_device *dev)
321{
322 char *event_string = "LEASE=1";
323 char *envp[] = { event_string, NULL };
324
325 DRM_DEBUG("generating lease event\n");
326
327 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
328}
329
330/**
331 * drm_sysfs_hotplug_event - generate a DRM uevent
332 * @dev: DRM device
333 *
334 * Send a uevent for the DRM device specified by @dev. Currently we only
335 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
336 * deal with other types of events.
337 *
338 * Any new uapi should be using the drm_sysfs_connector_status_event()
339 * for uevents on connector status change.
340 */
341void drm_sysfs_hotplug_event(struct drm_device *dev)
342{
343 char *event_string = "HOTPLUG=1";
344 char *envp[] = { event_string, NULL };
345
346 DRM_DEBUG("generating hotplug event\n");
347
348 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
349}
350EXPORT_SYMBOL(drm_sysfs_hotplug_event);
351
352/**
353 * drm_sysfs_connector_status_event - generate a DRM uevent for connector
354 * property status change
355 * @connector: connector on which property status changed
356 * @property: connector property whose status changed.
357 *
358 * Send a uevent for the DRM device specified by @dev. Currently we
359 * set HOTPLUG=1 and connector id along with the attached property id
360 * related to the status change.
361 */
362void drm_sysfs_connector_status_event(struct drm_connector *connector,
363 struct drm_property *property)
364{
365 struct drm_device *dev = connector->dev;
366 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
367 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
368
369 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
370 property->base.id));
371
372 snprintf(conn_id, ARRAY_SIZE(conn_id),
373 "CONNECTOR=%u", connector->base.id);
374 snprintf(prop_id, ARRAY_SIZE(prop_id),
375 "PROPERTY=%u", property->base.id);
376
377 DRM_DEBUG("generating connector status event\n");
378
379 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
380}
381EXPORT_SYMBOL(drm_sysfs_connector_status_event);
382
383static void drm_sysfs_release(struct device *dev)
384{
385 kfree(dev);
386}
387
388struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
389{
390 const char *minor_str;
391 struct device *kdev;
392 int r;
393
394 if (minor->type == DRM_MINOR_RENDER)
395 minor_str = "renderD%d";
396 else
397 minor_str = "card%d";
398
399 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
400 if (!kdev)
401 return ERR_PTR(-ENOMEM);
402
403 device_initialize(kdev);
404 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
405 kdev->class = drm_class;
406 kdev->type = &drm_sysfs_device_minor;
407 kdev->parent = minor->dev->dev;
408 kdev->release = drm_sysfs_release;
409 dev_set_drvdata(kdev, minor);
410
411 r = dev_set_name(kdev, minor_str, minor->index);
412 if (r < 0)
413 goto err_free;
414
415 return kdev;
416
417err_free:
418 put_device(kdev);
419 return ERR_PTR(r);
420}
421
422/**
423 * drm_class_device_register - register new device with the DRM sysfs class
424 * @dev: device to register
425 *
426 * Registers a new &struct device within the DRM sysfs class. Essentially only
427 * used by ttm to have a place for its global settings. Drivers should never use
428 * this.
429 */
430int drm_class_device_register(struct device *dev)
431{
432 if (!drm_class || IS_ERR(drm_class))
433 return -ENOENT;
434
435 dev->class = drm_class;
436 return device_register(dev);
437}
438EXPORT_SYMBOL_GPL(drm_class_device_register);
439
440/**
441 * drm_class_device_unregister - unregister device with the DRM sysfs class
442 * @dev: device to unregister
443 *
444 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
445 * by ttm to have a place for its global settings. Drivers should never use
446 * this.
447 */
448void drm_class_device_unregister(struct device *dev)
449{
450 return device_unregister(dev);
451}
452EXPORT_SYMBOL_GPL(drm_class_device_unregister);