1
2
3
4
5
6
7
8
9
10
11
12
13#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/export.h>
16#include <linux/gfp.h>
17#include <linux/i2c.h>
18#include <linux/kdev_t.h>
19#include <linux/slab.h>
20
21#include <drm/drm_connector.h>
22#include <drm/drm_device.h>
23#include <drm/drm_file.h>
24#include <drm/drm_modes.h>
25#include <drm/drm_print.h>
26#include <drm/drm_property.h>
27#include <drm/drm_sysfs.h>
28
29#include "drm_internal.h"
30#include "drm_crtc_internal.h"
31
32#define to_drm_minor(d) dev_get_drvdata(d)
33#define to_drm_connector(d) dev_get_drvdata(d)
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49static struct device_type drm_sysfs_device_minor = {
50 .name = "drm_minor"
51};
52
53struct class *drm_class;
54
55static char *drm_devnode(struct device *dev, umode_t *mode)
56{
57 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
58}
59
60static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
61
62
63
64
65
66
67
68
69
70
71
72int drm_sysfs_init(void)
73{
74 int err;
75
76 drm_class = class_create(THIS_MODULE, "drm");
77 if (IS_ERR(drm_class))
78 return PTR_ERR(drm_class);
79
80 err = class_create_file(drm_class, &class_attr_version.attr);
81 if (err) {
82 class_destroy(drm_class);
83 drm_class = NULL;
84 return err;
85 }
86
87 drm_class->devnode = drm_devnode;
88 return 0;
89}
90
91
92
93
94
95
96void drm_sysfs_destroy(void)
97{
98 if (IS_ERR_OR_NULL(drm_class))
99 return;
100 class_remove_file(drm_class, &class_attr_version.attr);
101 class_destroy(drm_class);
102 drm_class = NULL;
103}
104
105
106
107
108static ssize_t status_store(struct device *device,
109 struct device_attribute *attr,
110 const char *buf, size_t count)
111{
112 struct drm_connector *connector = to_drm_connector(device);
113 struct drm_device *dev = connector->dev;
114 enum drm_connector_force old_force;
115 int ret;
116
117 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
118 if (ret)
119 return ret;
120
121 old_force = connector->force;
122
123 if (sysfs_streq(buf, "detect"))
124 connector->force = 0;
125 else if (sysfs_streq(buf, "on"))
126 connector->force = DRM_FORCE_ON;
127 else if (sysfs_streq(buf, "on-digital"))
128 connector->force = DRM_FORCE_ON_DIGITAL;
129 else if (sysfs_streq(buf, "off"))
130 connector->force = DRM_FORCE_OFF;
131 else
132 ret = -EINVAL;
133
134 if (old_force != connector->force || !connector->force) {
135 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
136 connector->base.id,
137 connector->name,
138 old_force, connector->force);
139
140 connector->funcs->fill_modes(connector,
141 dev->mode_config.max_width,
142 dev->mode_config.max_height);
143 }
144
145 mutex_unlock(&dev->mode_config.mutex);
146
147 return ret ? ret : count;
148}
149
150static ssize_t status_show(struct device *device,
151 struct device_attribute *attr,
152 char *buf)
153{
154 struct drm_connector *connector = to_drm_connector(device);
155 enum drm_connector_status status;
156
157 status = READ_ONCE(connector->status);
158
159 return snprintf(buf, PAGE_SIZE, "%s\n",
160 drm_get_connector_status_name(status));
161}
162
163static ssize_t dpms_show(struct device *device,
164 struct device_attribute *attr,
165 char *buf)
166{
167 struct drm_connector *connector = to_drm_connector(device);
168 int dpms;
169
170 dpms = READ_ONCE(connector->dpms);
171
172 return snprintf(buf, PAGE_SIZE, "%s\n",
173 drm_get_dpms_name(dpms));
174}
175
176static ssize_t enabled_show(struct device *device,
177 struct device_attribute *attr,
178 char *buf)
179{
180 struct drm_connector *connector = to_drm_connector(device);
181 bool enabled;
182
183 enabled = READ_ONCE(connector->encoder);
184
185 return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
186}
187
188static ssize_t edid_show(struct file *filp, struct kobject *kobj,
189 struct bin_attribute *attr, char *buf, loff_t off,
190 size_t count)
191{
192 struct device *connector_dev = kobj_to_dev(kobj);
193 struct drm_connector *connector = to_drm_connector(connector_dev);
194 unsigned char *edid;
195 size_t size;
196 ssize_t ret = 0;
197
198 mutex_lock(&connector->dev->mode_config.mutex);
199 if (!connector->edid_blob_ptr)
200 goto unlock;
201
202 edid = connector->edid_blob_ptr->data;
203 size = connector->edid_blob_ptr->length;
204 if (!edid)
205 goto unlock;
206
207 if (off >= size)
208 goto unlock;
209
210 if (off + count > size)
211 count = size - off;
212 memcpy(buf, edid + off, count);
213
214 ret = count;
215unlock:
216 mutex_unlock(&connector->dev->mode_config.mutex);
217
218 return ret;
219}
220
221static ssize_t modes_show(struct device *device,
222 struct device_attribute *attr,
223 char *buf)
224{
225 struct drm_connector *connector = to_drm_connector(device);
226 struct drm_display_mode *mode;
227 int written = 0;
228
229 mutex_lock(&connector->dev->mode_config.mutex);
230 list_for_each_entry(mode, &connector->modes, head) {
231 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
232 mode->name);
233 }
234 mutex_unlock(&connector->dev->mode_config.mutex);
235
236 return written;
237}
238
239static DEVICE_ATTR_RW(status);
240static DEVICE_ATTR_RO(enabled);
241static DEVICE_ATTR_RO(dpms);
242static DEVICE_ATTR_RO(modes);
243
244static struct attribute *connector_dev_attrs[] = {
245 &dev_attr_status.attr,
246 &dev_attr_enabled.attr,
247 &dev_attr_dpms.attr,
248 &dev_attr_modes.attr,
249 NULL
250};
251
252static struct bin_attribute edid_attr = {
253 .attr.name = "edid",
254 .attr.mode = 0444,
255 .size = 0,
256 .read = edid_show,
257};
258
259static struct bin_attribute *connector_bin_attrs[] = {
260 &edid_attr,
261 NULL
262};
263
264static const struct attribute_group connector_dev_group = {
265 .attrs = connector_dev_attrs,
266 .bin_attrs = connector_bin_attrs,
267};
268
269static const struct attribute_group *connector_dev_groups[] = {
270 &connector_dev_group,
271 NULL
272};
273
274int drm_sysfs_connector_add(struct drm_connector *connector)
275{
276 struct drm_device *dev = connector->dev;
277
278 if (connector->kdev)
279 return 0;
280
281 connector->kdev =
282 device_create_with_groups(drm_class, dev->primary->kdev, 0,
283 connector, connector_dev_groups,
284 "card%d-%s", dev->primary->index,
285 connector->name);
286 DRM_DEBUG("adding \"%s\" to sysfs\n",
287 connector->name);
288
289 if (IS_ERR(connector->kdev)) {
290 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
291 return PTR_ERR(connector->kdev);
292 }
293
294 if (connector->ddc)
295 return sysfs_create_link(&connector->kdev->kobj,
296 &connector->ddc->dev.kobj, "ddc");
297 return 0;
298}
299
300void drm_sysfs_connector_remove(struct drm_connector *connector)
301{
302 if (!connector->kdev)
303 return;
304
305 if (connector->ddc)
306 sysfs_remove_link(&connector->kdev->kobj, "ddc");
307
308 DRM_DEBUG("removing \"%s\" from sysfs\n",
309 connector->name);
310
311 device_unregister(connector->kdev);
312 connector->kdev = NULL;
313}
314
315void drm_sysfs_lease_event(struct drm_device *dev)
316{
317 char *event_string = "LEASE=1";
318 char *envp[] = { event_string, NULL };
319
320 DRM_DEBUG("generating lease event\n");
321
322 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
323}
324
325
326
327
328
329
330
331
332
333
334
335
336void drm_sysfs_hotplug_event(struct drm_device *dev)
337{
338 char *event_string = "HOTPLUG=1";
339 char *envp[] = { event_string, NULL };
340
341 DRM_DEBUG("generating hotplug event\n");
342
343 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
344}
345EXPORT_SYMBOL(drm_sysfs_hotplug_event);
346
347
348
349
350
351
352
353
354
355
356
357void drm_sysfs_connector_status_event(struct drm_connector *connector,
358 struct drm_property *property)
359{
360 struct drm_device *dev = connector->dev;
361 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
362 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
363
364 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
365 property->base.id));
366
367 snprintf(conn_id, ARRAY_SIZE(conn_id),
368 "CONNECTOR=%u", connector->base.id);
369 snprintf(prop_id, ARRAY_SIZE(prop_id),
370 "PROPERTY=%u", property->base.id);
371
372 DRM_DEBUG("generating connector status event\n");
373
374 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
375}
376EXPORT_SYMBOL(drm_sysfs_connector_status_event);
377
378static void drm_sysfs_release(struct device *dev)
379{
380 kfree(dev);
381}
382
383struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
384{
385 const char *minor_str;
386 struct device *kdev;
387 int r;
388
389 if (minor->type == DRM_MINOR_RENDER)
390 minor_str = "renderD%d";
391 else
392 minor_str = "card%d";
393
394 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
395 if (!kdev)
396 return ERR_PTR(-ENOMEM);
397
398 device_initialize(kdev);
399 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
400 kdev->class = drm_class;
401 kdev->type = &drm_sysfs_device_minor;
402 kdev->parent = minor->dev->dev;
403 kdev->release = drm_sysfs_release;
404 dev_set_drvdata(kdev, minor);
405
406 r = dev_set_name(kdev, minor_str, minor->index);
407 if (r < 0)
408 goto err_free;
409
410 return kdev;
411
412err_free:
413 put_device(kdev);
414 return ERR_PTR(r);
415}
416
417
418
419
420
421
422
423
424
425int drm_class_device_register(struct device *dev)
426{
427 if (!drm_class || IS_ERR(drm_class))
428 return -ENOENT;
429
430 dev->class = drm_class;
431 return device_register(dev);
432}
433EXPORT_SYMBOL_GPL(drm_class_device_register);
434
435
436
437
438
439
440
441
442
443void drm_class_device_unregister(struct device *dev)
444{
445 return device_unregister(dev);
446}
447EXPORT_SYMBOL_GPL(drm_class_device_unregister);
448