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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#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);
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_sysfs.h"
22#include "drm_core.h"
23#include "drmP.h"
24
25#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
26#define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
27
28static struct device_type drm_sysfs_device_minor = {
29 .name = "drm_minor"
30};
31
32/**
33 * drm_class_suspend - DRM class suspend hook
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_resume - DRM class resume hook
56 * @dev: Linux device to resume
57 *
58 * Just figures out what the actual struct drm_device associated with
59 * @dev is and calls its resume hook, if present.
60 */
61static int drm_class_resume(struct device *dev)
62{
63 if (dev->type == &drm_sysfs_device_minor) {
64 struct drm_minor *drm_minor = to_drm_minor(dev);
65 struct drm_device *drm_dev = drm_minor->dev;
66
67 if (drm_minor->type == DRM_MINOR_LEGACY &&
68 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
69 drm_dev->driver->resume)
70 return drm_dev->driver->resume(drm_dev);
71 }
72 return 0;
73}
74
75static char *drm_devnode(struct device *dev, umode_t *mode)
76{
77 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
78}
79
80static CLASS_ATTR_STRING(version, S_IRUGO,
81 CORE_NAME " "
82 __stringify(CORE_MAJOR) "."
83 __stringify(CORE_MINOR) "."
84 __stringify(CORE_PATCHLEVEL) " "
85 CORE_DATE);
86
87/**
88 * drm_sysfs_create - create a struct drm_sysfs_class structure
89 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
90 * @name: pointer to a string for the name of this class.
91 *
92 * This is used to create DRM class pointer that can then be used
93 * in calls to drm_sysfs_device_add().
94 *
95 * Note, the pointer created here is to be destroyed when finished by making a
96 * call to drm_sysfs_destroy().
97 */
98struct class *drm_sysfs_create(struct module *owner, char *name)
99{
100 struct class *class;
101 int err;
102
103 class = class_create(owner, name);
104 if (IS_ERR(class)) {
105 err = PTR_ERR(class);
106 goto err_out;
107 }
108
109 class->suspend = drm_class_suspend;
110 class->resume = drm_class_resume;
111
112 err = class_create_file(class, &class_attr_version.attr);
113 if (err)
114 goto err_out_class;
115
116 class->devnode = drm_devnode;
117
118 return class;
119
120err_out_class:
121 class_destroy(class);
122err_out:
123 return ERR_PTR(err);
124}
125
126/**
127 * drm_sysfs_destroy - destroys DRM class
128 *
129 * Destroy the DRM device class.
130 */
131void drm_sysfs_destroy(void)
132{
133 if ((drm_class == NULL) || (IS_ERR(drm_class)))
134 return;
135 class_remove_file(drm_class, &class_attr_version.attr);
136 class_destroy(drm_class);
137}
138
139/**
140 * drm_sysfs_device_release - do nothing
141 * @dev: Linux device
142 *
143 * Normally, this would free the DRM device associated with @dev, along
144 * with cleaning up any other stuff. But we do that in the DRM core, so
145 * this function can just return and hope that the core does its job.
146 */
147static void drm_sysfs_device_release(struct device *dev)
148{
149 memset(dev, 0, sizeof(struct device));
150 return;
151}
152
153/*
154 * Connector properties
155 */
156static ssize_t status_show(struct device *device,
157 struct device_attribute *attr,
158 char *buf)
159{
160 struct drm_connector *connector = to_drm_connector(device);
161 enum drm_connector_status status;
162 int ret;
163
164 ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
165 if (ret)
166 return ret;
167
168 status = connector->funcs->detect(connector, true);
169 mutex_unlock(&connector->dev->mode_config.mutex);
170
171 return snprintf(buf, PAGE_SIZE, "%s\n",
172 drm_get_connector_status_name(status));
173}
174
175static ssize_t dpms_show(struct device *device,
176 struct device_attribute *attr,
177 char *buf)
178{
179 struct drm_connector *connector = to_drm_connector(device);
180 struct drm_device *dev = connector->dev;
181 uint64_t dpms_status;
182 int ret;
183
184 ret = drm_connector_property_get_value(connector,
185 dev->mode_config.dpms_property,
186 &dpms_status);
187 if (ret)
188 return 0;
189
190 return snprintf(buf, PAGE_SIZE, "%s\n",
191 drm_get_dpms_name((int)dpms_status));
192}
193
194static ssize_t enabled_show(struct device *device,
195 struct device_attribute *attr,
196 char *buf)
197{
198 struct drm_connector *connector = to_drm_connector(device);
199
200 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
201 "disabled");
202}
203
204static ssize_t edid_show(struct file *filp, struct kobject *kobj,
205 struct bin_attribute *attr, char *buf, loff_t off,
206 size_t count)
207{
208 struct device *connector_dev = container_of(kobj, struct device, kobj);
209 struct drm_connector *connector = to_drm_connector(connector_dev);
210 unsigned char *edid;
211 size_t size;
212
213 if (!connector->edid_blob_ptr)
214 return 0;
215
216 edid = connector->edid_blob_ptr->data;
217 size = connector->edid_blob_ptr->length;
218 if (!edid)
219 return 0;
220
221 if (off >= size)
222 return 0;
223
224 if (off + count > size)
225 count = size - off;
226 memcpy(buf, edid + off, count);
227
228 return count;
229}
230
231static ssize_t modes_show(struct device *device,
232 struct device_attribute *attr,
233 char *buf)
234{
235 struct drm_connector *connector = to_drm_connector(device);
236 struct drm_display_mode *mode;
237 int written = 0;
238
239 list_for_each_entry(mode, &connector->modes, head) {
240 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
241 mode->name);
242 }
243
244 return written;
245}
246
247static ssize_t subconnector_show(struct device *device,
248 struct device_attribute *attr,
249 char *buf)
250{
251 struct drm_connector *connector = to_drm_connector(device);
252 struct drm_device *dev = connector->dev;
253 struct drm_property *prop = NULL;
254 uint64_t subconnector;
255 int is_tv = 0;
256 int ret;
257
258 switch (connector->connector_type) {
259 case DRM_MODE_CONNECTOR_DVII:
260 prop = dev->mode_config.dvi_i_subconnector_property;
261 break;
262 case DRM_MODE_CONNECTOR_Composite:
263 case DRM_MODE_CONNECTOR_SVIDEO:
264 case DRM_MODE_CONNECTOR_Component:
265 case DRM_MODE_CONNECTOR_TV:
266 prop = dev->mode_config.tv_subconnector_property;
267 is_tv = 1;
268 break;
269 default:
270 DRM_ERROR("Wrong connector type for this property\n");
271 return 0;
272 }
273
274 if (!prop) {
275 DRM_ERROR("Unable to find subconnector property\n");
276 return 0;
277 }
278
279 ret = drm_connector_property_get_value(connector, prop, &subconnector);
280 if (ret)
281 return 0;
282
283 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
284 drm_get_tv_subconnector_name((int)subconnector) :
285 drm_get_dvi_i_subconnector_name((int)subconnector));
286}
287
288static ssize_t select_subconnector_show(struct device *device,
289 struct device_attribute *attr,
290 char *buf)
291{
292 struct drm_connector *connector = to_drm_connector(device);
293 struct drm_device *dev = connector->dev;
294 struct drm_property *prop = NULL;
295 uint64_t subconnector;
296 int is_tv = 0;
297 int ret;
298
299 switch (connector->connector_type) {
300 case DRM_MODE_CONNECTOR_DVII:
301 prop = dev->mode_config.dvi_i_select_subconnector_property;
302 break;
303 case DRM_MODE_CONNECTOR_Composite:
304 case DRM_MODE_CONNECTOR_SVIDEO:
305 case DRM_MODE_CONNECTOR_Component:
306 case DRM_MODE_CONNECTOR_TV:
307 prop = dev->mode_config.tv_select_subconnector_property;
308 is_tv = 1;
309 break;
310 default:
311 DRM_ERROR("Wrong connector type for this property\n");
312 return 0;
313 }
314
315 if (!prop) {
316 DRM_ERROR("Unable to find select subconnector property\n");
317 return 0;
318 }
319
320 ret = drm_connector_property_get_value(connector, prop, &subconnector);
321 if (ret)
322 return 0;
323
324 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
325 drm_get_tv_select_name((int)subconnector) :
326 drm_get_dvi_i_select_name((int)subconnector));
327}
328
329static struct device_attribute connector_attrs[] = {
330 __ATTR_RO(status),
331 __ATTR_RO(enabled),
332 __ATTR_RO(dpms),
333 __ATTR_RO(modes),
334};
335
336/* These attributes are for both DVI-I connectors and all types of tv-out. */
337static struct device_attribute connector_attrs_opt1[] = {
338 __ATTR_RO(subconnector),
339 __ATTR_RO(select_subconnector),
340};
341
342static struct bin_attribute edid_attr = {
343 .attr.name = "edid",
344 .attr.mode = 0444,
345 .size = 0,
346 .read = edid_show,
347};
348
349/**
350 * drm_sysfs_connector_add - add a connector to sysfs
351 * @connector: connector to add
352 *
353 * Create a connector device in sysfs, along with its associated connector
354 * properties (so far, connection status, dpms, mode list & edid) and
355 * generate a hotplug event so userspace knows there's a new connector
356 * available.
357 *
358 * Note:
359 * This routine should only be called *once* for each registered connector.
360 * A second call for an already registered connector will trigger the BUG_ON
361 * below.
362 */
363int drm_sysfs_connector_add(struct drm_connector *connector)
364{
365 struct drm_device *dev = connector->dev;
366 int attr_cnt = 0;
367 int opt_cnt = 0;
368 int i;
369 int ret;
370
371 /* We shouldn't get called more than once for the same connector */
372 BUG_ON(device_is_registered(&connector->kdev));
373
374 connector->kdev.parent = &dev->primary->kdev;
375 connector->kdev.class = drm_class;
376 connector->kdev.release = drm_sysfs_device_release;
377
378 DRM_DEBUG("adding \"%s\" to sysfs\n",
379 drm_get_connector_name(connector));
380
381 dev_set_name(&connector->kdev, "card%d-%s",
382 dev->primary->index, drm_get_connector_name(connector));
383 ret = device_register(&connector->kdev);
384
385 if (ret) {
386 DRM_ERROR("failed to register connector device: %d\n", ret);
387 goto out;
388 }
389
390 /* Standard attributes */
391
392 for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
393 ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]);
394 if (ret)
395 goto err_out_files;
396 }
397
398 /* Optional attributes */
399 /*
400 * In the long run it maybe a good idea to make one set of
401 * optionals per connector type.
402 */
403 switch (connector->connector_type) {
404 case DRM_MODE_CONNECTOR_DVII:
405 case DRM_MODE_CONNECTOR_Composite:
406 case DRM_MODE_CONNECTOR_SVIDEO:
407 case DRM_MODE_CONNECTOR_Component:
408 case DRM_MODE_CONNECTOR_TV:
409 for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
410 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[opt_cnt]);
411 if (ret)
412 goto err_out_files;
413 }
414 break;
415 default:
416 break;
417 }
418
419 ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
420 if (ret)
421 goto err_out_files;
422
423 /* Let userspace know we have a new connector */
424 drm_sysfs_hotplug_event(dev);
425
426 return 0;
427
428err_out_files:
429 for (i = 0; i < opt_cnt; i++)
430 device_remove_file(&connector->kdev, &connector_attrs_opt1[i]);
431 for (i = 0; i < attr_cnt; i++)
432 device_remove_file(&connector->kdev, &connector_attrs[i]);
433 device_unregister(&connector->kdev);
434
435out:
436 return ret;
437}
438EXPORT_SYMBOL(drm_sysfs_connector_add);
439
440/**
441 * drm_sysfs_connector_remove - remove an connector device from sysfs
442 * @connector: connector to remove
443 *
444 * Remove @connector and its associated attributes from sysfs. Note that
445 * the device model core will take care of sending the "remove" uevent
446 * at this time, so we don't need to do it.
447 *
448 * Note:
449 * This routine should only be called if the connector was previously
450 * successfully registered. If @connector hasn't been registered yet,
451 * you'll likely see a panic somewhere deep in sysfs code when called.
452 */
453void drm_sysfs_connector_remove(struct drm_connector *connector)
454{
455 int i;
456
457 if (!connector->kdev.parent)
458 return;
459 DRM_DEBUG("removing \"%s\" from sysfs\n",
460 drm_get_connector_name(connector));
461
462 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
463 device_remove_file(&connector->kdev, &connector_attrs[i]);
464 sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
465 device_unregister(&connector->kdev);
466 connector->kdev.parent = NULL;
467}
468EXPORT_SYMBOL(drm_sysfs_connector_remove);
469
470/**
471 * drm_sysfs_hotplug_event - generate a DRM uevent
472 * @dev: DRM device
473 *
474 * Send a uevent for the DRM device specified by @dev. Currently we only
475 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
476 * deal with other types of events.
477 */
478void drm_sysfs_hotplug_event(struct drm_device *dev)
479{
480 char *event_string = "HOTPLUG=1";
481 char *envp[] = { event_string, NULL };
482
483 DRM_DEBUG("generating hotplug event\n");
484
485 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
486}
487EXPORT_SYMBOL(drm_sysfs_hotplug_event);
488
489/**
490 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
491 * @dev: DRM device to be added
492 * @head: DRM head in question
493 *
494 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
495 * as the parent for the Linux device, and make sure it has a file containing
496 * the driver we're using (for userspace compatibility).
497 */
498int drm_sysfs_device_add(struct drm_minor *minor)
499{
500 int err;
501 char *minor_str;
502
503 minor->kdev.parent = minor->dev->dev;
504
505 minor->kdev.class = drm_class;
506 minor->kdev.release = drm_sysfs_device_release;
507 minor->kdev.devt = minor->device;
508 minor->kdev.type = &drm_sysfs_device_minor;
509 if (minor->type == DRM_MINOR_CONTROL)
510 minor_str = "controlD%d";
511 else if (minor->type == DRM_MINOR_RENDER)
512 minor_str = "renderD%d";
513 else
514 minor_str = "card%d";
515
516 dev_set_name(&minor->kdev, minor_str, minor->index);
517
518 err = device_register(&minor->kdev);
519 if (err) {
520 DRM_ERROR("device add failed: %d\n", err);
521 goto err_out;
522 }
523
524 return 0;
525
526err_out:
527 return err;
528}
529
530/**
531 * drm_sysfs_device_remove - remove DRM device
532 * @dev: DRM device to remove
533 *
534 * This call unregisters and cleans up a class device that was created with a
535 * call to drm_sysfs_device_add()
536 */
537void drm_sysfs_device_remove(struct drm_minor *minor)
538{
539 if (minor->kdev.parent)
540 device_unregister(&minor->kdev);
541 minor->kdev.parent = NULL;
542}
543
544
545/**
546 * drm_class_device_register - Register a struct device in the drm class.
547 *
548 * @dev: pointer to struct device to register.
549 *
550 * @dev should have all relevant members pre-filled with the exception
551 * of the class member. In particular, the device_type member must
552 * be set.
553 */
554
555int drm_class_device_register(struct device *dev)
556{
557 dev->class = drm_class;
558 return device_register(dev);
559}
560EXPORT_SYMBOL_GPL(drm_class_device_register);
561
562void drm_class_device_unregister(struct device *dev)
563{
564 return device_unregister(dev);
565}
566EXPORT_SYMBOL_GPL(drm_class_device_unregister);