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/gfp.h>
  18 #include <linux/err.h>
  19
  20 #include "drm_sysfs.h"
  21 #include "drm_core.h"
  22 #include "drmP.h"
  23
  24 #define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
  25 #define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
  26
  27 static struct device_type drm_sysfs_device_minor = {
  28         .name = "drm_minor"
  29 };
  30
  31 /**
  32  * drm_class_suspend - DRM class suspend hook
  33  * @dev: Linux device to suspend
  34  * @state: power state to enter
  35  *
  36  * Just figures out what the actual struct drm_device associated with
  37  * @dev is and calls its suspend hook, if present.
  38  */
  39 static int drm_class_suspend(struct device *dev, pm_message_t state)
  40 {
  41         if (dev->type == &drm_sysfs_device_minor) {
  42                 struct drm_minor *drm_minor = to_drm_minor(dev);
  43                 struct drm_device *drm_dev = drm_minor->dev;
  44
  45                 if (drm_minor->type == DRM_MINOR_LEGACY &&
  46                     !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
  47                     drm_dev->driver->suspend)
  48                         return drm_dev->driver->suspend(drm_dev, state);
  49         }
  50         return 0;
  51 }
  52
  53 /**
  54  * drm_class_resume - DRM class resume hook
  55  * @dev: Linux device to resume
  56  *
  57  * Just figures out what the actual struct drm_device associated with
  58  * @dev is and calls its resume hook, if present.
  59  */
  60 static int drm_class_resume(struct device *dev)
  61 {
  62         if (dev->type == &drm_sysfs_device_minor) {
  63                 struct drm_minor *drm_minor = to_drm_minor(dev);
  64                 struct drm_device *drm_dev = drm_minor->dev;
  65
  66                 if (drm_minor->type == DRM_MINOR_LEGACY &&
  67                     !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
  68                     drm_dev->driver->resume)
  69                         return drm_dev->driver->resume(drm_dev);
  70         }
  71         return 0;
  72 }
  73
  74 static char *drm_devnode(struct device *dev, mode_t *mode)
  75 {
  76         return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
  77 }
  78
  79 static CLASS_ATTR_STRING(version, S_IRUGO,
  80                 CORE_NAME " "
  81                 __stringify(CORE_MAJOR) "."
  82                 __stringify(CORE_MINOR) "."
  83                 __stringify(CORE_PATCHLEVEL) " "
  84                 CORE_DATE);
  85
  86 /**
  87  * drm_sysfs_create - create a struct drm_sysfs_class structure
  88  * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
  89  * @name: pointer to a string for the name of this class.
  90  *
  91  * This is used to create DRM class pointer that can then be used
  92  * in calls to drm_sysfs_device_add().
  93  *
  94  * Note, the pointer created here is to be destroyed when finished by making a
  95  * call to drm_sysfs_destroy().
  96  */
  97 struct class *drm_sysfs_create(struct module *owner, char *name)
  98 {
  99         struct class *class;
 100         int err;
 101
 102         class = class_create(owner, name);
 103         if (IS_ERR(class)) {
 104                 err = PTR_ERR(class);
 105                 goto err_out;
 106         }
 107
 108         class->suspend = drm_class_suspend;
 109         class->resume = drm_class_resume;
 110
 111         err = class_create_file(class, &class_attr_version.attr);
 112         if (err)
 113                 goto err_out_class;
 114
 115         class->devnode = drm_devnode;
 116
 117         return class;
 118
 119 err_out_class:
 120         class_destroy(class);
 121 err_out:
 122         return ERR_PTR(err);
 123 }
 124
 125 /**
 126  * drm_sysfs_destroy - destroys DRM class
 127  *
 128  * Destroy the DRM device class.
 129  */
 130 void drm_sysfs_destroy(void)
 131 {
 132         if ((drm_class == NULL) || (IS_ERR(drm_class)))
 133                 return;
 134         class_remove_file(drm_class, &class_attr_version.attr);
 135         class_destroy(drm_class);
 136 }
 137
 138 /**
 139  * drm_sysfs_device_release - do nothing
 140  * @dev: Linux device
 141  *
 142  * Normally, this would free the DRM device associated with @dev, along
 143  * with cleaning up any other stuff.  But we do that in the DRM core, so
 144  * this function can just return and hope that the core does its job.
 145  */
 146 static void drm_sysfs_device_release(struct device *dev)
 147 {
 148         memset(dev, 0, sizeof(struct device));
 149         return;
 150 }
 151
 152 /*
 153  * Connector properties
 154  */
 155 static ssize_t status_show(struct device *device,
 156                            struct device_attribute *attr,
 157                            char *buf)
 158 {
 159         struct drm_connector *connector = to_drm_connector(device);
 160         enum drm_connector_status status;
 161
 162         status = connector->funcs->detect(connector, true);
 163         return snprintf(buf, PAGE_SIZE, "%s\n",
 164                         drm_get_connector_status_name(status));
 165 }
 166
 167 static ssize_t dpms_show(struct device *device,
 168                            struct device_attribute *attr,
 169                            char *buf)
 170 {
 171         struct drm_connector *connector = to_drm_connector(device);
 172         struct drm_device *dev = connector->dev;
 173         uint64_t dpms_status;
 174         int ret;
 175
 176         ret = drm_connector_property_get_value(connector,
 177                                             dev->mode_config.dpms_property,
 178                                             &dpms_status);
 179         if (ret)
 180                 return 0;
 181
 182         return snprintf(buf, PAGE_SIZE, "%s\n",
 183                         drm_get_dpms_name((int)dpms_status));
 184 }
 185
 186 static ssize_t enabled_show(struct device *device,
 187                             struct device_attribute *attr,
 188                            char *buf)
 189 {
 190         struct drm_connector *connector = to_drm_connector(device);
 191
 192         return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
 193                         "disabled");
 194 }
 195
 196 static ssize_t edid_show(struct file *filp, struct kobject *kobj,
 197                          struct bin_attribute *attr, char *buf, loff_t off,
 198                          size_t count)
 199 {
 200         struct device *connector_dev = container_of(kobj, struct device, kobj);
 201         struct drm_connector *connector = to_drm_connector(connector_dev);
 202         unsigned char *edid;
 203         size_t size;
 204
 205         if (!connector->edid_blob_ptr)
 206                 return 0;
 207
 208         edid = connector->edid_blob_ptr->data;
 209         size = connector->edid_blob_ptr->length;
 210         if (!edid)
 211                 return 0;
 212
 213         if (off >= size)
 214                 return 0;
 215
 216         if (off + count > size)
 217                 count = size - off;
 218         memcpy(buf, edid + off, count);
 219
 220         return count;
 221 }
 222
 223 static 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         list_for_each_entry(mode, &connector->modes, head) {
 232                 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
 233                                     mode->name);
 234         }
 235
 236         return written;
 237 }
 238
 239 static ssize_t subconnector_show(struct device *device,
 240                            struct device_attribute *attr,
 241                            char *buf)
 242 {
 243         struct drm_connector *connector = to_drm_connector(device);
 244         struct drm_device *dev = connector->dev;
 245         struct drm_property *prop = NULL;
 246         uint64_t subconnector;
 247         int is_tv = 0;
 248         int ret;
 249
 250         switch (connector->connector_type) {
 251                 case DRM_MODE_CONNECTOR_DVII:
 252                         prop = dev->mode_config.dvi_i_subconnector_property;
 253                         break;
 254                 case DRM_MODE_CONNECTOR_Composite:
 255                 case DRM_MODE_CONNECTOR_SVIDEO:
 256                 case DRM_MODE_CONNECTOR_Component:
 257                 case DRM_MODE_CONNECTOR_TV:
 258                         prop = dev->mode_config.tv_subconnector_property;
 259                         is_tv = 1;
 260                         break;
 261                 default:
 262                         DRM_ERROR("Wrong connector type for this property\n");
 263                         return 0;
 264         }
 265
 266         if (!prop) {
 267                 DRM_ERROR("Unable to find subconnector property\n");
 268                 return 0;
 269         }
 270
 271         ret = drm_connector_property_get_value(connector, prop, &subconnector);
 272         if (ret)
 273                 return 0;
 274
 275         return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
 276                         drm_get_tv_subconnector_name((int)subconnector) :
 277                         drm_get_dvi_i_subconnector_name((int)subconnector));
 278 }
 279
 280 static ssize_t select_subconnector_show(struct device *device,
 281                            struct device_attribute *attr,
 282                            char *buf)
 283 {
 284         struct drm_connector *connector = to_drm_connector(device);
 285         struct drm_device *dev = connector->dev;
 286         struct drm_property *prop = NULL;
 287         uint64_t subconnector;
 288         int is_tv = 0;
 289         int ret;
 290
 291         switch (connector->connector_type) {
 292                 case DRM_MODE_CONNECTOR_DVII:
 293                         prop = dev->mode_config.dvi_i_select_subconnector_property;
 294                         break;
 295                 case DRM_MODE_CONNECTOR_Composite:
 296                 case DRM_MODE_CONNECTOR_SVIDEO:
 297                 case DRM_MODE_CONNECTOR_Component:
 298                 case DRM_MODE_CONNECTOR_TV:
 299                         prop = dev->mode_config.tv_select_subconnector_property;
 300                         is_tv = 1;
 301                         break;
 302                 default:
 303                         DRM_ERROR("Wrong connector type for this property\n");
 304                         return 0;
 305         }
 306
 307         if (!prop) {
 308                 DRM_ERROR("Unable to find select subconnector property\n");
 309                 return 0;
 310         }
 311
 312         ret = drm_connector_property_get_value(connector, prop, &subconnector);
 313         if (ret)
 314                 return 0;
 315
 316         return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
 317                         drm_get_tv_select_name((int)subconnector) :
 318                         drm_get_dvi_i_select_name((int)subconnector));
 319 }
 320
 321 static struct device_attribute connector_attrs[] = {
 322         __ATTR_RO(status),
 323         __ATTR_RO(enabled),
 324         __ATTR_RO(dpms),
 325         __ATTR_RO(modes),
 326 };
 327
 328 /* These attributes are for both DVI-I connectors and all types of tv-out. */
 329 static struct device_attribute connector_attrs_opt1[] = {
 330         __ATTR_RO(subconnector),
 331         __ATTR_RO(select_subconnector),
 332 };
 333
 334 static struct bin_attribute edid_attr = {
 335         .attr.name = "edid",
 336         .attr.mode = 0444,
 337         .size = 0,
 338         .read = edid_show,
 339 };
 340
 341 /**
 342  * drm_sysfs_connector_add - add an connector to sysfs
 343  * @connector: connector to add
 344  *
 345  * Create an connector device in sysfs, along with its associated connector
 346  * properties (so far, connection status, dpms, mode list & edid) and
 347  * generate a hotplug event so userspace knows there's a new connector
 348  * available.
 349  *
 350  * Note:
 351  * This routine should only be called *once* for each DRM minor registered.
 352  * A second call for an already registered device will trigger the BUG_ON
 353  * below.
 354  */
 355 int drm_sysfs_connector_add(struct drm_connector *connector)
 356 {
 357         struct drm_device *dev = connector->dev;
 358         int attr_cnt = 0;
 359         int opt_cnt = 0;
 360         int i;
 361         int ret = 0;
 362
 363         /* We shouldn't get called more than once for the same connector */
 364         BUG_ON(device_is_registered(&connector->kdev));
 365
 366         connector->kdev.parent = &dev->primary->kdev;
 367         connector->kdev.class = drm_class;
 368         connector->kdev.release = drm_sysfs_device_release;
 369
 370         DRM_DEBUG("adding \"%s\" to sysfs\n",
 371                   drm_get_connector_name(connector));
 372
 373         dev_set_name(&connector->kdev, "card%d-%s",
 374                      dev->primary->index, drm_get_connector_name(connector));
 375         ret = device_register(&connector->kdev);
 376
 377         if (ret) {
 378                 DRM_ERROR("failed to register connector device: %d\n", ret);
 379                 goto out;
 380         }
 381
 382         /* Standard attributes */
 383
 384         for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
 385                 ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]);
 386                 if (ret)
 387                         goto err_out_files;
 388         }
 389
 390         /* Optional attributes */
 391         /*
 392          * In the long run it maybe a good idea to make one set of
 393          * optionals per connector type.
 394          */
 395         switch (connector->connector_type) {
 396                 case DRM_MODE_CONNECTOR_DVII:
 397                 case DRM_MODE_CONNECTOR_Composite:
 398                 case DRM_MODE_CONNECTOR_SVIDEO:
 399                 case DRM_MODE_CONNECTOR_Component:
 400                 case DRM_MODE_CONNECTOR_TV:
 401                         for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
 402                                 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[opt_cnt]);
 403                                 if (ret)
 404                                         goto err_out_files;
 405                         }
 406                         break;
 407                 default:
 408                         break;
 409         }
 410
 411         ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
 412         if (ret)
 413                 goto err_out_files;
 414
 415         /* Let userspace know we have a new connector */
 416         drm_sysfs_hotplug_event(dev);
 417
 418         return 0;
 419
 420 err_out_files:
 421         for (i = 0; i < opt_cnt; i++)
 422                 device_remove_file(&connector->kdev, &connector_attrs_opt1[i]);
 423         for (i = 0; i < attr_cnt; i++)
 424                 device_remove_file(&connector->kdev, &connector_attrs[i]);
 425         device_unregister(&connector->kdev);
 426
 427 out:
 428         return ret;
 429 }
 430 EXPORT_SYMBOL(drm_sysfs_connector_add);
 431
 432 /**
 433  * drm_sysfs_connector_remove - remove an connector device from sysfs
 434  * @connector: connector to remove
 435  *
 436  * Remove @connector and its associated attributes from sysfs.  Note that
 437  * the device model core will take care of sending the "remove" uevent
 438  * at this time, so we don't need to do it.
 439  *
 440  * Note:
 441  * This routine should only be called if the connector was previously
 442  * successfully registered.  If @connector hasn't been registered yet,
 443  * you'll likely see a panic somewhere deep in sysfs code when called.
 444  */
 445 void drm_sysfs_connector_remove(struct drm_connector *connector)
 446 {
 447         int i;
 448
 449         DRM_DEBUG("removing \"%s\" from sysfs\n",
 450                   drm_get_connector_name(connector));
 451
 452         for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
 453                 device_remove_file(&connector->kdev, &connector_attrs[i]);
 454         sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
 455         device_unregister(&connector->kdev);
 456 }
 457 EXPORT_SYMBOL(drm_sysfs_connector_remove);
 458
 459 /**
 460  * drm_sysfs_hotplug_event - generate a DRM uevent
 461  * @dev: DRM device
 462  *
 463  * Send a uevent for the DRM device specified by @dev.  Currently we only
 464  * set HOTPLUG=1 in the uevent environment, but this could be expanded to
 465  * deal with other types of events.
 466  */
 467 void drm_sysfs_hotplug_event(struct drm_device *dev)
 468 {
 469         char *event_string = "HOTPLUG=1";
 470         char *envp[] = { event_string, NULL };
 471
 472         DRM_DEBUG("generating hotplug event\n");
 473
 474         kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
 475 }
 476 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
 477
 478 /**
 479  * drm_sysfs_device_add - adds a class device to sysfs for a character driver
 480  * @dev: DRM device to be added
 481  * @head: DRM head in question
 482  *
 483  * Add a DRM device to the DRM's device model class.  We use @dev's PCI device
 484  * as the parent for the Linux device, and make sure it has a file containing
 485  * the driver we're using (for userspace compatibility).
 486  */
 487 int drm_sysfs_device_add(struct drm_minor *minor)
 488 {
 489         int err;
 490         char *minor_str;
 491
 492         minor->kdev.parent = minor->dev->dev;
 493
 494         minor->kdev.class = drm_class;
 495         minor->kdev.release = drm_sysfs_device_release;
 496         minor->kdev.devt = minor->device;
 497         minor->kdev.type = &drm_sysfs_device_minor;
 498         if (minor->type == DRM_MINOR_CONTROL)
 499                 minor_str = "controlD%d";
 500         else if (minor->type == DRM_MINOR_RENDER)
 501                 minor_str = "renderD%d";
 502         else
 503                 minor_str = "card%d";
 504
 505         dev_set_name(&minor->kdev, minor_str, minor->index);
 506
 507         err = device_register(&minor->kdev);
 508         if (err) {
 509                 DRM_ERROR("device add failed: %d\n", err);
 510                 goto err_out;
 511         }
 512
 513         return 0;
 514
 515 err_out:
 516         return err;
 517 }
 518
 519 /**
 520  * drm_sysfs_device_remove - remove DRM device
 521  * @dev: DRM device to remove
 522  *
 523  * This call unregisters and cleans up a class device that was created with a
 524  * call to drm_sysfs_device_add()
 525  */
 526 void drm_sysfs_device_remove(struct drm_minor *minor)
 527 {
 528         device_unregister(&minor->kdev);
 529 }
 530
 531
 532 /**
 533  * drm_class_device_register - Register a struct device in the drm class.
 534  *
 535  * @dev: pointer to struct device to register.
 536  *
 537  * @dev should have all relevant members pre-filled with the exception
 538  * of the class member. In particular, the device_type member must
 539  * be set.
 540  */
 541
 542 int drm_class_device_register(struct device *dev)
 543 {
 544         dev->class = drm_class;
 545         return device_register(dev);
 546 }
 547 EXPORT_SYMBOL_GPL(drm_class_device_register);
 548
 549 void drm_class_device_unregister(struct device *dev)
 550 {
 551         return device_unregister(dev);
 552 }
 553 EXPORT_SYMBOL_GPL(drm_class_device_unregister);