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