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1// SPDX-License-Identifier: GPL-2.0-only
2
3/*
4 * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
5 * extra sysfs attribute from DRM. Normal drm_sysfs_class
6 * does not allow adding attributes.
7 *
8 * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
9 * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
10 * Copyright (c) 2003-2004 IBM Corp.
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 * DOC: overview
37 *
38 * DRM provides very little additional support to drivers for sysfs
39 * interactions, beyond just all the standard stuff. Drivers who want to expose
40 * additional sysfs properties and property groups can attach them at either
41 * &drm_device.dev or &drm_connector.kdev.
42 *
43 * Registration is automatically handled when calling drm_dev_register(), or
44 * drm_connector_register() in case of hot-plugged connectors. Unregistration is
45 * also automatically handled by drm_dev_unregister() and
46 * drm_connector_unregister().
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 * drm_sysfs_init - initialize sysfs helpers
64 *
65 * This is used to create the DRM class, which is the implicit parent of any
66 * other top-level DRM sysfs objects.
67 *
68 * You must call drm_sysfs_destroy() to release the allocated resources.
69 *
70 * Return: 0 on success, negative error code on failure.
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 drm_setup_hdcp_srm(drm_class);
89 return 0;
90}
91
92/**
93 * drm_sysfs_destroy - destroys DRM class
94 *
95 * Destroy the DRM device class.
96 */
97void drm_sysfs_destroy(void)
98{
99 if (IS_ERR_OR_NULL(drm_class))
100 return;
101 drm_teardown_hdcp_srm(drm_class);
102 class_remove_file(drm_class, &class_attr_version.attr);
103 class_destroy(drm_class);
104 drm_class = NULL;
105}
106
107/*
108 * Connector properties
109 */
110static ssize_t status_store(struct device *device,
111 struct device_attribute *attr,
112 const char *buf, size_t count)
113{
114 struct drm_connector *connector = to_drm_connector(device);
115 struct drm_device *dev = connector->dev;
116 enum drm_connector_force old_force;
117 int ret;
118
119 ret = mutex_lock_interruptible(&dev->mode_config.mutex);
120 if (ret)
121 return ret;
122
123 old_force = connector->force;
124
125 if (sysfs_streq(buf, "detect"))
126 connector->force = 0;
127 else if (sysfs_streq(buf, "on"))
128 connector->force = DRM_FORCE_ON;
129 else if (sysfs_streq(buf, "on-digital"))
130 connector->force = DRM_FORCE_ON_DIGITAL;
131 else if (sysfs_streq(buf, "off"))
132 connector->force = DRM_FORCE_OFF;
133 else
134 ret = -EINVAL;
135
136 if (old_force != connector->force || !connector->force) {
137 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
138 connector->base.id,
139 connector->name,
140 old_force, connector->force);
141
142 connector->funcs->fill_modes(connector,
143 dev->mode_config.max_width,
144 dev->mode_config.max_height);
145 }
146
147 mutex_unlock(&dev->mode_config.mutex);
148
149 return ret ? ret : count;
150}
151
152static ssize_t status_show(struct device *device,
153 struct device_attribute *attr,
154 char *buf)
155{
156 struct drm_connector *connector = to_drm_connector(device);
157 enum drm_connector_status status;
158
159 status = READ_ONCE(connector->status);
160
161 return snprintf(buf, PAGE_SIZE, "%s\n",
162 drm_get_connector_status_name(status));
163}
164
165static ssize_t dpms_show(struct device *device,
166 struct device_attribute *attr,
167 char *buf)
168{
169 struct drm_connector *connector = to_drm_connector(device);
170 int dpms;
171
172 dpms = READ_ONCE(connector->dpms);
173
174 return snprintf(buf, PAGE_SIZE, "%s\n",
175 drm_get_dpms_name(dpms));
176}
177
178static ssize_t enabled_show(struct device *device,
179 struct device_attribute *attr,
180 char *buf)
181{
182 struct drm_connector *connector = to_drm_connector(device);
183 bool enabled;
184
185 enabled = READ_ONCE(connector->encoder);
186
187 return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
188}
189
190static ssize_t edid_show(struct file *filp, struct kobject *kobj,
191 struct bin_attribute *attr, char *buf, loff_t off,
192 size_t count)
193{
194 struct device *connector_dev = kobj_to_dev(kobj);
195 struct drm_connector *connector = to_drm_connector(connector_dev);
196 unsigned char *edid;
197 size_t size;
198 ssize_t ret = 0;
199
200 mutex_lock(&connector->dev->mode_config.mutex);
201 if (!connector->edid_blob_ptr)
202 goto unlock;
203
204 edid = connector->edid_blob_ptr->data;
205 size = connector->edid_blob_ptr->length;
206 if (!edid)
207 goto unlock;
208
209 if (off >= size)
210 goto unlock;
211
212 if (off + count > size)
213 count = size - off;
214 memcpy(buf, edid + off, count);
215
216 ret = count;
217unlock:
218 mutex_unlock(&connector->dev->mode_config.mutex);
219
220 return ret;
221}
222
223static ssize_t modes_show(struct device *device,
224 struct device_attribute *attr,
225 char *buf)
226{
227 struct drm_connector *connector = to_drm_connector(device);
228 struct drm_display_mode *mode;
229 int written = 0;
230
231 mutex_lock(&connector->dev->mode_config.mutex);
232 list_for_each_entry(mode, &connector->modes, head) {
233 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
234 mode->name);
235 }
236 mutex_unlock(&connector->dev->mode_config.mutex);
237
238 return written;
239}
240
241static DEVICE_ATTR_RW(status);
242static DEVICE_ATTR_RO(enabled);
243static DEVICE_ATTR_RO(dpms);
244static DEVICE_ATTR_RO(modes);
245
246static struct attribute *connector_dev_attrs[] = {
247 &dev_attr_status.attr,
248 &dev_attr_enabled.attr,
249 &dev_attr_dpms.attr,
250 &dev_attr_modes.attr,
251 NULL
252};
253
254static struct bin_attribute edid_attr = {
255 .attr.name = "edid",
256 .attr.mode = 0444,
257 .size = 0,
258 .read = edid_show,
259};
260
261static struct bin_attribute *connector_bin_attrs[] = {
262 &edid_attr,
263 NULL
264};
265
266static const struct attribute_group connector_dev_group = {
267 .attrs = connector_dev_attrs,
268 .bin_attrs = connector_bin_attrs,
269};
270
271static const struct attribute_group *connector_dev_groups[] = {
272 &connector_dev_group,
273 NULL
274};
275
276int drm_sysfs_connector_add(struct drm_connector *connector)
277{
278 struct drm_device *dev = connector->dev;
279
280 if (connector->kdev)
281 return 0;
282
283 connector->kdev =
284 device_create_with_groups(drm_class, dev->primary->kdev, 0,
285 connector, connector_dev_groups,
286 "card%d-%s", dev->primary->index,
287 connector->name);
288 DRM_DEBUG("adding \"%s\" to sysfs\n",
289 connector->name);
290
291 if (IS_ERR(connector->kdev)) {
292 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
293 return PTR_ERR(connector->kdev);
294 }
295
296 /* Let userspace know we have a new connector */
297 drm_sysfs_hotplug_event(dev);
298
299 if (connector->ddc)
300 return sysfs_create_link(&connector->kdev->kobj,
301 &connector->ddc->dev.kobj, "ddc");
302 return 0;
303}
304
305void drm_sysfs_connector_remove(struct drm_connector *connector)
306{
307 if (!connector->kdev)
308 return;
309
310 if (connector->ddc)
311 sysfs_remove_link(&connector->kdev->kobj, "ddc");
312
313 DRM_DEBUG("removing \"%s\" from sysfs\n",
314 connector->name);
315
316 device_unregister(connector->kdev);
317 connector->kdev = NULL;
318}
319
320void drm_sysfs_lease_event(struct drm_device *dev)
321{
322 char *event_string = "LEASE=1";
323 char *envp[] = { event_string, NULL };
324
325 DRM_DEBUG("generating lease event\n");
326
327 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
328}
329
330/**
331 * drm_sysfs_hotplug_event - generate a DRM uevent
332 * @dev: DRM device
333 *
334 * Send a uevent for the DRM device specified by @dev. Currently we only
335 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
336 * deal with other types of events.
337 *
338 * Any new uapi should be using the drm_sysfs_connector_status_event()
339 * for uevents on connector status change.
340 */
341void drm_sysfs_hotplug_event(struct drm_device *dev)
342{
343 char *event_string = "HOTPLUG=1";
344 char *envp[] = { event_string, NULL };
345
346 DRM_DEBUG("generating hotplug event\n");
347
348 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
349}
350EXPORT_SYMBOL(drm_sysfs_hotplug_event);
351
352/**
353 * drm_sysfs_connector_status_event - generate a DRM uevent for connector
354 * property status change
355 * @connector: connector on which property status changed
356 * @property: connector property whose status changed.
357 *
358 * Send a uevent for the DRM device specified by @dev. Currently we
359 * set HOTPLUG=1 and connector id along with the attached property id
360 * related to the status change.
361 */
362void drm_sysfs_connector_status_event(struct drm_connector *connector,
363 struct drm_property *property)
364{
365 struct drm_device *dev = connector->dev;
366 char hotplug_str[] = "HOTPLUG=1", conn_id[21], prop_id[21];
367 char *envp[4] = { hotplug_str, conn_id, prop_id, NULL };
368
369 WARN_ON(!drm_mode_obj_find_prop_id(&connector->base,
370 property->base.id));
371
372 snprintf(conn_id, ARRAY_SIZE(conn_id),
373 "CONNECTOR=%u", connector->base.id);
374 snprintf(prop_id, ARRAY_SIZE(prop_id),
375 "PROPERTY=%u", property->base.id);
376
377 DRM_DEBUG("generating connector status event\n");
378
379 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
380}
381EXPORT_SYMBOL(drm_sysfs_connector_status_event);
382
383static void drm_sysfs_release(struct device *dev)
384{
385 kfree(dev);
386}
387
388struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
389{
390 const char *minor_str;
391 struct device *kdev;
392 int r;
393
394 if (minor->type == DRM_MINOR_RENDER)
395 minor_str = "renderD%d";
396 else
397 minor_str = "card%d";
398
399 kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
400 if (!kdev)
401 return ERR_PTR(-ENOMEM);
402
403 device_initialize(kdev);
404 kdev->devt = MKDEV(DRM_MAJOR, minor->index);
405 kdev->class = drm_class;
406 kdev->type = &drm_sysfs_device_minor;
407 kdev->parent = minor->dev->dev;
408 kdev->release = drm_sysfs_release;
409 dev_set_drvdata(kdev, minor);
410
411 r = dev_set_name(kdev, minor_str, minor->index);
412 if (r < 0)
413 goto err_free;
414
415 return kdev;
416
417err_free:
418 put_device(kdev);
419 return ERR_PTR(r);
420}
421
422/**
423 * drm_class_device_register - register new device with the DRM sysfs class
424 * @dev: device to register
425 *
426 * Registers a new &struct device within the DRM sysfs class. Essentially only
427 * used by ttm to have a place for its global settings. Drivers should never use
428 * this.
429 */
430int drm_class_device_register(struct device *dev)
431{
432 if (!drm_class || IS_ERR(drm_class))
433 return -ENOENT;
434
435 dev->class = drm_class;
436 return device_register(dev);
437}
438EXPORT_SYMBOL_GPL(drm_class_device_register);
439
440/**
441 * drm_class_device_unregister - unregister device with the DRM sysfs class
442 * @dev: device to unregister
443 *
444 * Unregisters a &struct device from the DRM sysfs class. Essentially only used
445 * by ttm to have a place for its global settings. Drivers should never use
446 * this.
447 */
448void drm_class_device_unregister(struct device *dev)
449{
450 return device_unregister(dev);
451}
452EXPORT_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/drm_sysfs.h>
22#include <drm/drm_core.h>
23#include <drm/drmP.h>
24
25#define to_drm_minor(d) dev_get_drvdata(d)
26#define to_drm_connector(d) dev_get_drvdata(d)
27
28static struct device_type drm_sysfs_device_minor = {
29 .name = "drm_minor"
30};
31
32/**
33 * __drm_class_suspend - internal DRM class suspend routine
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_suspend - internal DRM class suspend hook. Simply calls
56 * __drm_class_suspend() with the correct pm state.
57 * @dev: Linux device to suspend
58 */
59static int drm_class_suspend(struct device *dev)
60{
61 return __drm_class_suspend(dev, PMSG_SUSPEND);
62}
63
64/**
65 * drm_class_freeze - internal DRM class freeze hook. Simply calls
66 * __drm_class_suspend() with the correct pm state.
67 * @dev: Linux device to freeze
68 */
69static int drm_class_freeze(struct device *dev)
70{
71 return __drm_class_suspend(dev, PMSG_FREEZE);
72}
73
74/**
75 * drm_class_resume - DRM class resume hook
76 * @dev: Linux device to resume
77 *
78 * Just figures out what the actual struct drm_device associated with
79 * @dev is and calls its resume hook, if present.
80 */
81static int drm_class_resume(struct device *dev)
82{
83 if (dev->type == &drm_sysfs_device_minor) {
84 struct drm_minor *drm_minor = to_drm_minor(dev);
85 struct drm_device *drm_dev = drm_minor->dev;
86
87 if (drm_minor->type == DRM_MINOR_LEGACY &&
88 !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
89 drm_dev->driver->resume)
90 return drm_dev->driver->resume(drm_dev);
91 }
92 return 0;
93}
94
95static const struct dev_pm_ops drm_class_dev_pm_ops = {
96 .suspend = drm_class_suspend,
97 .resume = drm_class_resume,
98 .freeze = drm_class_freeze,
99};
100
101static char *drm_devnode(struct device *dev, umode_t *mode)
102{
103 return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
104}
105
106static CLASS_ATTR_STRING(version, S_IRUGO,
107 CORE_NAME " "
108 __stringify(CORE_MAJOR) "."
109 __stringify(CORE_MINOR) "."
110 __stringify(CORE_PATCHLEVEL) " "
111 CORE_DATE);
112
113/**
114 * drm_sysfs_create - create a struct drm_sysfs_class structure
115 * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
116 * @name: pointer to a string for the name of this class.
117 *
118 * This is used to create DRM class pointer that can then be used
119 * in calls to drm_sysfs_device_add().
120 *
121 * Note, the pointer created here is to be destroyed when finished by making a
122 * call to drm_sysfs_destroy().
123 */
124struct class *drm_sysfs_create(struct module *owner, char *name)
125{
126 struct class *class;
127 int err;
128
129 class = class_create(owner, name);
130 if (IS_ERR(class)) {
131 err = PTR_ERR(class);
132 goto err_out;
133 }
134
135 class->pm = &drm_class_dev_pm_ops;
136
137 err = class_create_file(class, &class_attr_version.attr);
138 if (err)
139 goto err_out_class;
140
141 class->devnode = drm_devnode;
142
143 return class;
144
145err_out_class:
146 class_destroy(class);
147err_out:
148 return ERR_PTR(err);
149}
150
151/**
152 * drm_sysfs_destroy - destroys DRM class
153 *
154 * Destroy the DRM device class.
155 */
156void drm_sysfs_destroy(void)
157{
158 if ((drm_class == NULL) || (IS_ERR(drm_class)))
159 return;
160 class_remove_file(drm_class, &class_attr_version.attr);
161 class_destroy(drm_class);
162 drm_class = NULL;
163}
164
165/*
166 * Connector properties
167 */
168static ssize_t status_show(struct device *device,
169 struct device_attribute *attr,
170 char *buf)
171{
172 struct drm_connector *connector = to_drm_connector(device);
173 enum drm_connector_status status;
174 int ret;
175
176 ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
177 if (ret)
178 return ret;
179
180 status = connector->funcs->detect(connector, true);
181 mutex_unlock(&connector->dev->mode_config.mutex);
182
183 return snprintf(buf, PAGE_SIZE, "%s\n",
184 drm_get_connector_status_name(status));
185}
186
187static ssize_t dpms_show(struct device *device,
188 struct device_attribute *attr,
189 char *buf)
190{
191 struct drm_connector *connector = to_drm_connector(device);
192 struct drm_device *dev = connector->dev;
193 uint64_t dpms_status;
194 int ret;
195
196 ret = drm_object_property_get_value(&connector->base,
197 dev->mode_config.dpms_property,
198 &dpms_status);
199 if (ret)
200 return 0;
201
202 return snprintf(buf, PAGE_SIZE, "%s\n",
203 drm_get_dpms_name((int)dpms_status));
204}
205
206static ssize_t enabled_show(struct device *device,
207 struct device_attribute *attr,
208 char *buf)
209{
210 struct drm_connector *connector = to_drm_connector(device);
211
212 return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
213 "disabled");
214}
215
216static ssize_t edid_show(struct file *filp, struct kobject *kobj,
217 struct bin_attribute *attr, char *buf, loff_t off,
218 size_t count)
219{
220 struct device *connector_dev = container_of(kobj, struct device, kobj);
221 struct drm_connector *connector = to_drm_connector(connector_dev);
222 unsigned char *edid;
223 size_t size;
224
225 if (!connector->edid_blob_ptr)
226 return 0;
227
228 edid = connector->edid_blob_ptr->data;
229 size = connector->edid_blob_ptr->length;
230 if (!edid)
231 return 0;
232
233 if (off >= size)
234 return 0;
235
236 if (off + count > size)
237 count = size - off;
238 memcpy(buf, edid + off, count);
239
240 return count;
241}
242
243static ssize_t modes_show(struct device *device,
244 struct device_attribute *attr,
245 char *buf)
246{
247 struct drm_connector *connector = to_drm_connector(device);
248 struct drm_display_mode *mode;
249 int written = 0;
250
251 list_for_each_entry(mode, &connector->modes, head) {
252 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
253 mode->name);
254 }
255
256 return written;
257}
258
259static ssize_t subconnector_show(struct device *device,
260 struct device_attribute *attr,
261 char *buf)
262{
263 struct drm_connector *connector = to_drm_connector(device);
264 struct drm_device *dev = connector->dev;
265 struct drm_property *prop = NULL;
266 uint64_t subconnector;
267 int is_tv = 0;
268 int ret;
269
270 switch (connector->connector_type) {
271 case DRM_MODE_CONNECTOR_DVII:
272 prop = dev->mode_config.dvi_i_subconnector_property;
273 break;
274 case DRM_MODE_CONNECTOR_Composite:
275 case DRM_MODE_CONNECTOR_SVIDEO:
276 case DRM_MODE_CONNECTOR_Component:
277 case DRM_MODE_CONNECTOR_TV:
278 prop = dev->mode_config.tv_subconnector_property;
279 is_tv = 1;
280 break;
281 default:
282 DRM_ERROR("Wrong connector type for this property\n");
283 return 0;
284 }
285
286 if (!prop) {
287 DRM_ERROR("Unable to find subconnector property\n");
288 return 0;
289 }
290
291 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
292 if (ret)
293 return 0;
294
295 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
296 drm_get_tv_subconnector_name((int)subconnector) :
297 drm_get_dvi_i_subconnector_name((int)subconnector));
298}
299
300static ssize_t select_subconnector_show(struct device *device,
301 struct device_attribute *attr,
302 char *buf)
303{
304 struct drm_connector *connector = to_drm_connector(device);
305 struct drm_device *dev = connector->dev;
306 struct drm_property *prop = NULL;
307 uint64_t subconnector;
308 int is_tv = 0;
309 int ret;
310
311 switch (connector->connector_type) {
312 case DRM_MODE_CONNECTOR_DVII:
313 prop = dev->mode_config.dvi_i_select_subconnector_property;
314 break;
315 case DRM_MODE_CONNECTOR_Composite:
316 case DRM_MODE_CONNECTOR_SVIDEO:
317 case DRM_MODE_CONNECTOR_Component:
318 case DRM_MODE_CONNECTOR_TV:
319 prop = dev->mode_config.tv_select_subconnector_property;
320 is_tv = 1;
321 break;
322 default:
323 DRM_ERROR("Wrong connector type for this property\n");
324 return 0;
325 }
326
327 if (!prop) {
328 DRM_ERROR("Unable to find select subconnector property\n");
329 return 0;
330 }
331
332 ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
333 if (ret)
334 return 0;
335
336 return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
337 drm_get_tv_select_name((int)subconnector) :
338 drm_get_dvi_i_select_name((int)subconnector));
339}
340
341static struct device_attribute connector_attrs[] = {
342 __ATTR_RO(status),
343 __ATTR_RO(enabled),
344 __ATTR_RO(dpms),
345 __ATTR_RO(modes),
346};
347
348/* These attributes are for both DVI-I connectors and all types of tv-out. */
349static struct device_attribute connector_attrs_opt1[] = {
350 __ATTR_RO(subconnector),
351 __ATTR_RO(select_subconnector),
352};
353
354static struct bin_attribute edid_attr = {
355 .attr.name = "edid",
356 .attr.mode = 0444,
357 .size = 0,
358 .read = edid_show,
359};
360
361/**
362 * drm_sysfs_connector_add - add a connector to sysfs
363 * @connector: connector to add
364 *
365 * Create a connector device in sysfs, along with its associated connector
366 * properties (so far, connection status, dpms, mode list & edid) and
367 * generate a hotplug event so userspace knows there's a new connector
368 * available.
369 */
370int drm_sysfs_connector_add(struct drm_connector *connector)
371{
372 struct drm_device *dev = connector->dev;
373 int attr_cnt = 0;
374 int opt_cnt = 0;
375 int i;
376 int ret;
377
378 if (connector->kdev)
379 return 0;
380
381 connector->kdev = device_create(drm_class, dev->primary->kdev,
382 0, connector, "card%d-%s",
383 dev->primary->index, drm_get_connector_name(connector));
384 DRM_DEBUG("adding \"%s\" to sysfs\n",
385 drm_get_connector_name(connector));
386
387 if (IS_ERR(connector->kdev)) {
388 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
389 ret = PTR_ERR(connector->kdev);
390 goto out;
391 }
392
393 /* Standard attributes */
394
395 for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
396 ret = device_create_file(connector->kdev, &connector_attrs[attr_cnt]);
397 if (ret)
398 goto err_out_files;
399 }
400
401 /* Optional attributes */
402 /*
403 * In the long run it maybe a good idea to make one set of
404 * optionals per connector type.
405 */
406 switch (connector->connector_type) {
407 case DRM_MODE_CONNECTOR_DVII:
408 case DRM_MODE_CONNECTOR_Composite:
409 case DRM_MODE_CONNECTOR_SVIDEO:
410 case DRM_MODE_CONNECTOR_Component:
411 case DRM_MODE_CONNECTOR_TV:
412 for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
413 ret = device_create_file(connector->kdev, &connector_attrs_opt1[opt_cnt]);
414 if (ret)
415 goto err_out_files;
416 }
417 break;
418 default:
419 break;
420 }
421
422 ret = sysfs_create_bin_file(&connector->kdev->kobj, &edid_attr);
423 if (ret)
424 goto err_out_files;
425
426 /* Let userspace know we have a new connector */
427 drm_sysfs_hotplug_event(dev);
428
429 return 0;
430
431err_out_files:
432 for (i = 0; i < opt_cnt; i++)
433 device_remove_file(connector->kdev, &connector_attrs_opt1[i]);
434 for (i = 0; i < attr_cnt; i++)
435 device_remove_file(connector->kdev, &connector_attrs[i]);
436 device_unregister(connector->kdev);
437
438out:
439 return ret;
440}
441EXPORT_SYMBOL(drm_sysfs_connector_add);
442
443/**
444 * drm_sysfs_connector_remove - remove an connector device from sysfs
445 * @connector: connector to remove
446 *
447 * Remove @connector and its associated attributes from sysfs. Note that
448 * the device model core will take care of sending the "remove" uevent
449 * at this time, so we don't need to do it.
450 *
451 * Note:
452 * This routine should only be called if the connector was previously
453 * successfully registered. If @connector hasn't been registered yet,
454 * you'll likely see a panic somewhere deep in sysfs code when called.
455 */
456void drm_sysfs_connector_remove(struct drm_connector *connector)
457{
458 int i;
459
460 if (!connector->kdev)
461 return;
462 DRM_DEBUG("removing \"%s\" from sysfs\n",
463 drm_get_connector_name(connector));
464
465 for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
466 device_remove_file(connector->kdev, &connector_attrs[i]);
467 sysfs_remove_bin_file(&connector->kdev->kobj, &edid_attr);
468 device_unregister(connector->kdev);
469 connector->kdev = NULL;
470}
471EXPORT_SYMBOL(drm_sysfs_connector_remove);
472
473/**
474 * drm_sysfs_hotplug_event - generate a DRM uevent
475 * @dev: DRM device
476 *
477 * Send a uevent for the DRM device specified by @dev. Currently we only
478 * set HOTPLUG=1 in the uevent environment, but this could be expanded to
479 * deal with other types of events.
480 */
481void drm_sysfs_hotplug_event(struct drm_device *dev)
482{
483 char *event_string = "HOTPLUG=1";
484 char *envp[] = { event_string, NULL };
485
486 DRM_DEBUG("generating hotplug event\n");
487
488 kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
489}
490EXPORT_SYMBOL(drm_sysfs_hotplug_event);
491
492static void drm_sysfs_release(struct device *dev)
493{
494 kfree(dev);
495}
496
497/**
498 * drm_sysfs_device_add - adds a class device to sysfs for a character driver
499 * @dev: DRM device to be added
500 * @head: DRM head in question
501 *
502 * Add a DRM device to the DRM's device model class. We use @dev's PCI device
503 * as the parent for the Linux device, and make sure it has a file containing
504 * the driver we're using (for userspace compatibility).
505 */
506int drm_sysfs_device_add(struct drm_minor *minor)
507{
508 char *minor_str;
509 int r;
510
511 if (minor->type == DRM_MINOR_CONTROL)
512 minor_str = "controlD%d";
513 else if (minor->type == DRM_MINOR_RENDER)
514 minor_str = "renderD%d";
515 else
516 minor_str = "card%d";
517
518 minor->kdev = kzalloc(sizeof(*minor->kdev), GFP_KERNEL);
519 if (!minor->kdev) {
520 r = -ENOMEM;
521 goto error;
522 }
523
524 device_initialize(minor->kdev);
525 minor->kdev->devt = MKDEV(DRM_MAJOR, minor->index);
526 minor->kdev->class = drm_class;
527 minor->kdev->type = &drm_sysfs_device_minor;
528 minor->kdev->parent = minor->dev->dev;
529 minor->kdev->release = drm_sysfs_release;
530 dev_set_drvdata(minor->kdev, minor);
531
532 r = dev_set_name(minor->kdev, minor_str, minor->index);
533 if (r < 0)
534 goto error;
535
536 r = device_add(minor->kdev);
537 if (r < 0)
538 goto error;
539
540 return 0;
541
542error:
543 DRM_ERROR("device create failed %d\n", r);
544 put_device(minor->kdev);
545 return r;
546}
547
548/**
549 * drm_sysfs_device_remove - remove DRM device
550 * @dev: DRM device to remove
551 *
552 * This call unregisters and cleans up a class device that was created with a
553 * call to drm_sysfs_device_add()
554 */
555void drm_sysfs_device_remove(struct drm_minor *minor)
556{
557 if (minor->kdev)
558 device_unregister(minor->kdev);
559 minor->kdev = NULL;
560}
561
562
563/**
564 * drm_class_device_register - Register a struct device in the drm class.
565 *
566 * @dev: pointer to struct device to register.
567 *
568 * @dev should have all relevant members pre-filled with the exception
569 * of the class member. In particular, the device_type member must
570 * be set.
571 */
572
573int drm_class_device_register(struct device *dev)
574{
575 if (!drm_class || IS_ERR(drm_class))
576 return -ENOENT;
577
578 dev->class = drm_class;
579 return device_register(dev);
580}
581EXPORT_SYMBOL_GPL(drm_class_device_register);
582
583void drm_class_device_unregister(struct device *dev)
584{
585 return device_unregister(dev);
586}
587EXPORT_SYMBOL_GPL(drm_class_device_unregister);