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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
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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
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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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%s\n", drm_get_dpms_name(dpms));
173}
174
175static ssize_t enabled_show(struct device *device,
176 struct device_attribute *attr,
177 char *buf)
178{
179 struct drm_connector *connector = to_drm_connector(device);
180 bool enabled;
181
182 enabled = READ_ONCE(connector->encoder);
183
184 return sysfs_emit(buf, enabled ? "enabled\n" : "disabled\n");
185}
186
187static ssize_t edid_show(struct file *filp, struct kobject *kobj,
188 struct bin_attribute *attr, char *buf, loff_t off,
189 size_t count)
190{
191 struct device *connector_dev = kobj_to_dev(kobj);
192 struct drm_connector *connector = to_drm_connector(connector_dev);
193 unsigned char *edid;
194 size_t size;
195 ssize_t ret = 0;
196
197 mutex_lock(&connector->dev->mode_config.mutex);
198 if (!connector->edid_blob_ptr)
199 goto unlock;
200
201 edid = connector->edid_blob_ptr->data;
202 size = connector->edid_blob_ptr->length;
203 if (!edid)
204 goto unlock;
205
206 if (off >= size)
207 goto unlock;
208
209 if (off + count > size)
210 count = size - off;
211 memcpy(buf, edid + off, count);
212
213 ret = count;
214unlock:
215 mutex_unlock(&connector->dev->mode_config.mutex);
216
217 return ret;
218}
219
220static ssize_t modes_show(struct device *device,
221 struct device_attribute *attr,
222 char *buf)
223{
224 struct drm_connector *connector = to_drm_connector(device);
225 struct drm_display_mode *mode;
226 int written = 0;
227
228 mutex_lock(&connector->dev->mode_config.mutex);
229 list_for_each_entry(mode, &connector->modes, head) {
230 written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
231 mode->name);
232 }
233 mutex_unlock(&connector->dev->mode_config.mutex);
234
235 return written;
236}
237
238static DEVICE_ATTR_RW(status);
239static DEVICE_ATTR_RO(enabled);
240static DEVICE_ATTR_RO(dpms);
241static DEVICE_ATTR_RO(modes);
242
243static struct attribute *connector_dev_attrs[] = {
244 &dev_attr_status.attr,
245 &dev_attr_enabled.attr,
246 &dev_attr_dpms.attr,
247 &dev_attr_modes.attr,
248 NULL
249};
250
251static struct bin_attribute edid_attr = {
252 .attr.name = "edid",
253 .attr.mode = 0444,
254 .size = 0,
255 .read = edid_show,
256};
257
258static struct bin_attribute *connector_bin_attrs[] = {
259 &edid_attr,
260 NULL
261};
262
263static const struct attribute_group connector_dev_group = {
264 .attrs = connector_dev_attrs,
265 .bin_attrs = connector_bin_attrs,
266};
267
268static const struct attribute_group *connector_dev_groups[] = {
269 &connector_dev_group,
270 NULL
271};
272
273int drm_sysfs_connector_add(struct drm_connector *connector)
274{
275 struct drm_device *dev = connector->dev;
276
277 if (connector->kdev)
278 return 0;
279
280 connector->kdev =
281 device_create_with_groups(drm_class, dev->primary->kdev, 0,
282 connector, connector_dev_groups,
283 "card%d-%s", dev->primary->index,
284 connector->name);
285 DRM_DEBUG("adding \"%s\" to sysfs\n",
286 connector->name);
287
288 if (IS_ERR(connector->kdev)) {
289 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
290 return PTR_ERR(connector->kdev);
291 }
292
293 if (connector->ddc)
294 return sysfs_create_link(&connector->kdev->kobj,
295 &connector->ddc->dev.kobj, "ddc");
296 return 0;
297}
298
299void drm_sysfs_connector_remove(struct drm_connector *connector)
300{
301 if (!connector->kdev)
302 return;
303
304 if (connector->ddc)
305 sysfs_remove_link(&connector->kdev->kobj, "ddc");
306
307 DRM_DEBUG("removing \"%s\" from sysfs\n",
308 connector->name);
309
310 device_unregister(connector->kdev);
311 connector->kdev = NULL;
312}
313
314void drm_sysfs_lease_event(struct drm_device *dev)
315{
316 char *event_string = "LEASE=1";
317 char *envp[] = { event_string, NULL };
318
319 DRM_DEBUG("generating lease event\n");
320
321 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
322}
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335void drm_sysfs_hotplug_event(struct drm_device *dev)
336{
337 char *event_string = "HOTPLUG=1";
338 char *envp[] = { event_string, NULL };
339
340 DRM_DEBUG("generating hotplug event\n");
341
342 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
343}
344EXPORT_SYMBOL(drm_sysfs_hotplug_event);
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355
356void drm_sysfs_connector_status_event(struct drm_connector *connector,
357 struct drm_property *property)
358{
359 struct drm_device *dev = connector->dev;
360 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
361 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
362
363 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
364 property->base.id));
365
366 snprintf(conn_id, ARRAY_SIZE(conn_id),
367 "CONNECTOR=%u", connector->base.id);
368 snprintf(prop_id, ARRAY_SIZE(prop_id),
369 "PROPERTY=%u", property->base.id);
370
371 DRM_DEBUG("generating connector status event\n");
372
373 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
374}
375EXPORT_SYMBOL(drm_sysfs_connector_status_event);
376
377static void drm_sysfs_release(struct device *dev)
378{
379 kfree(dev);
380}
381
382struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
383{
384 const char *minor_str;
385 struct device *kdev;
386 int r;
387
388 if (minor->type == DRM_MINOR_RENDER)
389 minor_str = "renderD%d";
390 else
391 minor_str = "card%d";
392
393 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
394 if (!kdev)
395 return ERR_PTR(-ENOMEM);
396
397 device_initialize(kdev);
398 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
399 kdev->class = drm_class;
400 kdev->type = &drm_sysfs_device_minor;
401 kdev->parent = minor->dev->dev;
402 kdev->release = drm_sysfs_release;
403 dev_set_drvdata(kdev, minor);
404
405 r = dev_set_name(kdev, minor_str, minor->index);
406 if (r < 0)
407 goto err_free;
408
409 return kdev;
410
411err_free:
412 put_device(kdev);
413 return ERR_PTR(r);
414}
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423
424int drm_class_device_register(struct device *dev)
425{
426 if (!drm_class || IS_ERR(drm_class))
427 return -ENOENT;
428
429 dev->class = drm_class;
430 return device_register(dev);
431}
432EXPORT_SYMBOL_GPL(drm_class_device_register);
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442void drm_class_device_unregister(struct device *dev)
443{
444 return device_unregister(dev);
445}
446EXPORT_SYMBOL_GPL(drm_class_device_unregister);
447