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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
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);