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