ALSA: Core - clean up snd_card_set_id* calls and remove possible id collision
[deliverable/linux.git] / drivers / gpu / drm / drm_sysfs.c
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/err.h>
18
19 #include "drm_core.h"
20 #include "drmP.h"
21
22 #define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
23 #define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
24
25 /**
26 * drm_sysfs_suspend - DRM class suspend hook
27 * @dev: Linux device to suspend
28 * @state: power state to enter
29 *
30 * Just figures out what the actual struct drm_device associated with
31 * @dev is and calls its suspend hook, if present.
32 */
33 static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
34 {
35 struct drm_minor *drm_minor = to_drm_minor(dev);
36 struct drm_device *drm_dev = drm_minor->dev;
37
38 if (drm_minor->type == DRM_MINOR_LEGACY &&
39 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
40 drm_dev->driver->suspend)
41 return drm_dev->driver->suspend(drm_dev, state);
42
43 return 0;
44 }
45
46 /**
47 * drm_sysfs_resume - DRM class resume hook
48 * @dev: Linux device to resume
49 *
50 * Just figures out what the actual struct drm_device associated with
51 * @dev is and calls its resume hook, if present.
52 */
53 static int drm_sysfs_resume(struct device *dev)
54 {
55 struct drm_minor *drm_minor = to_drm_minor(dev);
56 struct drm_device *drm_dev = drm_minor->dev;
57
58 if (drm_minor->type == DRM_MINOR_LEGACY &&
59 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
60 drm_dev->driver->resume)
61 return drm_dev->driver->resume(drm_dev);
62
63 return 0;
64 }
65
66 /* Display the version of drm_core. This doesn't work right in current design */
67 static ssize_t version_show(struct class *dev, char *buf)
68 {
69 return sprintf(buf, "%s %d.%d.%d %s\n", CORE_NAME, CORE_MAJOR,
70 CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
71 }
72
73 static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
74
75 /**
76 * drm_sysfs_create - create a struct drm_sysfs_class structure
77 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
78 * @name: pointer to a string for the name of this class.
79 *
80 * This is used to create DRM class pointer that can then be used
81 * in calls to drm_sysfs_device_add().
82 *
83 * Note, the pointer created here is to be destroyed when finished by making a
84 * call to drm_sysfs_destroy().
85 */
86 struct class *drm_sysfs_create(struct module *owner, char *name)
87 {
88 struct class *class;
89 int err;
90
91 class = class_create(owner, name);
92 if (IS_ERR(class)) {
93 err = PTR_ERR(class);
94 goto err_out;
95 }
96
97 class->suspend = drm_sysfs_suspend;
98 class->resume = drm_sysfs_resume;
99
100 err = class_create_file(class, &class_attr_version);
101 if (err)
102 goto err_out_class;
103
104 return class;
105
106 err_out_class:
107 class_destroy(class);
108 err_out:
109 return ERR_PTR(err);
110 }
111
112 /**
113 * drm_sysfs_destroy - destroys DRM class
114 *
115 * Destroy the DRM device class.
116 */
117 void drm_sysfs_destroy(void)
118 {
119 if ((drm_class == NULL) || (IS_ERR(drm_class)))
120 return;
121 class_remove_file(drm_class, &class_attr_version);
122 class_destroy(drm_class);
123 }
124
125 /**
126 * drm_sysfs_device_release - do nothing
127 * @dev: Linux device
128 *
129 * Normally, this would free the DRM device associated with @dev, along
130 * with cleaning up any other stuff. But we do that in the DRM core, so
131 * this function can just return and hope that the core does its job.
132 */
133 static void drm_sysfs_device_release(struct device *dev)
134 {
135 memset(dev, 0, sizeof(struct device));
136 return;
137 }
138
139 /*
140 * Connector properties
141 */
142 static ssize_t status_show(struct device *device,
143 struct device_attribute *attr,
144 char *buf)
145 {
146 struct drm_connector *connector = to_drm_connector(device);
147 enum drm_connector_status status;
148
149 status = connector->funcs->detect(connector);
150 return snprintf(buf, PAGE_SIZE, "%s",
151 drm_get_connector_status_name(status));
152 }
153
154 static ssize_t dpms_show(struct device *device,
155 struct device_attribute *attr,
156 char *buf)
157 {
158 struct drm_connector *connector = to_drm_connector(device);
159 struct drm_device *dev = connector->dev;
160 uint64_t dpms_status;
161 int ret;
162
163 ret = drm_connector_property_get_value(connector,
164 dev->mode_config.dpms_property,
165 &dpms_status);
166 if (ret)
167 return 0;
168
169 return snprintf(buf, PAGE_SIZE, "%s",
170 drm_get_dpms_name((int)dpms_status));
171 }
172
173 static ssize_t enabled_show(struct device *device,
174 struct device_attribute *attr,
175 char *buf)
176 {
177 struct drm_connector *connector = to_drm_connector(device);
178
179 return snprintf(buf, PAGE_SIZE, connector->encoder ? "enabled" :
180 "disabled");
181 }
182
183 static ssize_t edid_show(struct kobject *kobj, struct bin_attribute *attr,
184 char *buf, loff_t off, size_t count)
185 {
186 struct device *connector_dev = container_of(kobj, struct device, kobj);
187 struct drm_connector *connector = to_drm_connector(connector_dev);
188 unsigned char *edid;
189 size_t size;
190
191 if (!connector->edid_blob_ptr)
192 return 0;
193
194 edid = connector->edid_blob_ptr->data;
195 size = connector->edid_blob_ptr->length;
196 if (!edid)
197 return 0;
198
199 if (off >= size)
200 return 0;
201
202 if (off + count > size)
203 count = size - off;
204 memcpy(buf, edid + off, count);
205
206 return count;
207 }
208
209 static ssize_t modes_show(struct device *device,
210 struct device_attribute *attr,
211 char *buf)
212 {
213 struct drm_connector *connector = to_drm_connector(device);
214 struct drm_display_mode *mode;
215 int written = 0;
216
217 list_for_each_entry(mode, &connector->modes, head) {
218 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
219 mode->name);
220 }
221
222 return written;
223 }
224
225 static ssize_t subconnector_show(struct device *device,
226 struct device_attribute *attr,
227 char *buf)
228 {
229 struct drm_connector *connector = to_drm_connector(device);
230 struct drm_device *dev = connector->dev;
231 struct drm_property *prop = NULL;
232 uint64_t subconnector;
233 int is_tv = 0;
234 int ret;
235
236 switch (connector->connector_type) {
237 case DRM_MODE_CONNECTOR_DVII:
238 prop = dev->mode_config.dvi_i_subconnector_property;
239 break;
240 case DRM_MODE_CONNECTOR_Composite:
241 case DRM_MODE_CONNECTOR_SVIDEO:
242 case DRM_MODE_CONNECTOR_Component:
243 prop = dev->mode_config.tv_subconnector_property;
244 is_tv = 1;
245 break;
246 default:
247 DRM_ERROR("Wrong connector type for this property\n");
248 return 0;
249 }
250
251 if (!prop) {
252 DRM_ERROR("Unable to find subconnector property\n");
253 return 0;
254 }
255
256 ret = drm_connector_property_get_value(connector, prop, &subconnector);
257 if (ret)
258 return 0;
259
260 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
261 drm_get_tv_subconnector_name((int)subconnector) :
262 drm_get_dvi_i_subconnector_name((int)subconnector));
263 }
264
265 static ssize_t select_subconnector_show(struct device *device,
266 struct device_attribute *attr,
267 char *buf)
268 {
269 struct drm_connector *connector = to_drm_connector(device);
270 struct drm_device *dev = connector->dev;
271 struct drm_property *prop = NULL;
272 uint64_t subconnector;
273 int is_tv = 0;
274 int ret;
275
276 switch (connector->connector_type) {
277 case DRM_MODE_CONNECTOR_DVII:
278 prop = dev->mode_config.dvi_i_select_subconnector_property;
279 break;
280 case DRM_MODE_CONNECTOR_Composite:
281 case DRM_MODE_CONNECTOR_SVIDEO:
282 case DRM_MODE_CONNECTOR_Component:
283 prop = dev->mode_config.tv_select_subconnector_property;
284 is_tv = 1;
285 break;
286 default:
287 DRM_ERROR("Wrong connector type for this property\n");
288 return 0;
289 }
290
291 if (!prop) {
292 DRM_ERROR("Unable to find select subconnector property\n");
293 return 0;
294 }
295
296 ret = drm_connector_property_get_value(connector, prop, &subconnector);
297 if (ret)
298 return 0;
299
300 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
301 drm_get_tv_select_name((int)subconnector) :
302 drm_get_dvi_i_select_name((int)subconnector));
303 }
304
305 static struct device_attribute connector_attrs[] = {
306 __ATTR_RO(status),
307 __ATTR_RO(enabled),
308 __ATTR_RO(dpms),
309 __ATTR_RO(modes),
310 };
311
312 /* These attributes are for both DVI-I connectors and all types of tv-out. */
313 static struct device_attribute connector_attrs_opt1[] = {
314 __ATTR_RO(subconnector),
315 __ATTR_RO(select_subconnector),
316 };
317
318 static struct bin_attribute edid_attr = {
319 .attr.name = "edid",
320 .size = 128,
321 .read = edid_show,
322 };
323
324 /**
325 * drm_sysfs_connector_add - add an connector to sysfs
326 * @connector: connector to add
327 *
328 * Create an connector device in sysfs, along with its associated connector
329 * properties (so far, connection status, dpms, mode list & edid) and
330 * generate a hotplug event so userspace knows there's a new connector
331 * available.
332 *
333 * Note:
334 * This routine should only be called *once* for each DRM minor registered.
335 * A second call for an already registered device will trigger the BUG_ON
336 * below.
337 */
338 int drm_sysfs_connector_add(struct drm_connector *connector)
339 {
340 struct drm_device *dev = connector->dev;
341 int ret = 0, i, j;
342
343 /* We shouldn't get called more than once for the same connector */
344 BUG_ON(device_is_registered(&connector->kdev));
345
346 connector->kdev.parent = &dev->primary->kdev;
347 connector->kdev.class = drm_class;
348 connector->kdev.release = drm_sysfs_device_release;
349
350 DRM_DEBUG("adding \"%s\" to sysfs\n",
351 drm_get_connector_name(connector));
352
353 dev_set_name(&connector->kdev, "card%d-%s",
354 dev->primary->index, drm_get_connector_name(connector));
355 ret = device_register(&connector->kdev);
356
357 if (ret) {
358 DRM_ERROR("failed to register connector device: %d\n", ret);
359 goto out;
360 }
361
362 /* Standard attributes */
363
364 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++) {
365 ret = device_create_file(&connector->kdev, &connector_attrs[i]);
366 if (ret)
367 goto err_out_files;
368 }
369
370 /* Optional attributes */
371 /*
372 * In the long run it maybe a good idea to make one set of
373 * optionals per connector type.
374 */
375 switch (connector->connector_type) {
376 case DRM_MODE_CONNECTOR_DVII:
377 case DRM_MODE_CONNECTOR_Composite:
378 case DRM_MODE_CONNECTOR_SVIDEO:
379 case DRM_MODE_CONNECTOR_Component:
380 for (i = 0; i < ARRAY_SIZE(connector_attrs_opt1); i++) {
381 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[i]);
382 if (ret)
383 goto err_out_files;
384 }
385 break;
386 default:
387 break;
388 }
389
390 ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
391 if (ret)
392 goto err_out_files;
393
394 /* Let userspace know we have a new connector */
395 drm_sysfs_hotplug_event(dev);
396
397 return 0;
398
399 err_out_files:
400 if (i > 0)
401 for (j = 0; j < i; j++)
402 device_remove_file(&connector->kdev,
403 &connector_attrs[i]);
404 device_unregister(&connector->kdev);
405
406 out:
407 return ret;
408 }
409 EXPORT_SYMBOL(drm_sysfs_connector_add);
410
411 /**
412 * drm_sysfs_connector_remove - remove an connector device from sysfs
413 * @connector: connector to remove
414 *
415 * Remove @connector and its associated attributes from sysfs. Note that
416 * the device model core will take care of sending the "remove" uevent
417 * at this time, so we don't need to do it.
418 *
419 * Note:
420 * This routine should only be called if the connector was previously
421 * successfully registered. If @connector hasn't been registered yet,
422 * you'll likely see a panic somewhere deep in sysfs code when called.
423 */
424 void drm_sysfs_connector_remove(struct drm_connector *connector)
425 {
426 int i;
427
428 DRM_DEBUG("removing \"%s\" from sysfs\n",
429 drm_get_connector_name(connector));
430
431 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
432 device_remove_file(&connector->kdev, &connector_attrs[i]);
433 sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
434 device_unregister(&connector->kdev);
435 }
436 EXPORT_SYMBOL(drm_sysfs_connector_remove);
437
438 /**
439 * drm_sysfs_hotplug_event - generate a DRM uevent
440 * @dev: DRM device
441 *
442 * Send a uevent for the DRM device specified by @dev. Currently we only
443 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
444 * deal with other types of events.
445 */
446 void drm_sysfs_hotplug_event(struct drm_device *dev)
447 {
448 char *event_string = "HOTPLUG=1";
449 char *envp[] = { event_string, NULL };
450
451 DRM_DEBUG("generating hotplug event\n");
452
453 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
454 }
455 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
456
457 /**
458 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
459 * @dev: DRM device to be added
460 * @head: DRM head in question
461 *
462 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
463 * as the parent for the Linux device, and make sure it has a file containing
464 * the driver we're using (for userspace compatibility).
465 */
466 int drm_sysfs_device_add(struct drm_minor *minor)
467 {
468 int err;
469 char *minor_str;
470
471 minor->kdev.parent = &minor->dev->pdev->dev;
472 minor->kdev.class = drm_class;
473 minor->kdev.release = drm_sysfs_device_release;
474 minor->kdev.devt = minor->device;
475 if (minor->type == DRM_MINOR_CONTROL)
476 minor_str = "controlD%d";
477 else if (minor->type == DRM_MINOR_RENDER)
478 minor_str = "renderD%d";
479 else
480 minor_str = "card%d";
481
482 dev_set_name(&minor->kdev, minor_str, minor->index);
483
484 err = device_register(&minor->kdev);
485 if (err) {
486 DRM_ERROR("device add failed: %d\n", err);
487 goto err_out;
488 }
489
490 return 0;
491
492 err_out:
493 return err;
494 }
495
496 /**
497 * drm_sysfs_device_remove - remove DRM device
498 * @dev: DRM device to remove
499 *
500 * This call unregisters and cleans up a class device that was created with a
501 * call to drm_sysfs_device_add()
502 */
503 void drm_sysfs_device_remove(struct drm_minor *minor)
504 {
505 device_unregister(&minor->kdev);
506 }
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