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 #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) container_of(d, struct drm_minor, kdev)
  26 #define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
  27
  28 static 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  */
  40 static 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  */
  59 static 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  */
  69 static 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  */
  81 static 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
  95 static 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
 101 static char *drm_devnode(struct device *dev, umode_t *mode)
 102 {
 103         return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
 104 }
 105
 106 static 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  */
 124 struct 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
 145 err_out_class:
 146         class_destroy(class);
 147 err_out:
 148         return ERR_PTR(err);
 149 }
 150
 151 /**
 152  * drm_sysfs_destroy - destroys DRM class
 153  *
 154  * Destroy the DRM device class.
 155  */
 156 void 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  * drm_sysfs_device_release - do nothing
 167  * @dev: Linux device
 168  *
 169  * Normally, this would free the DRM device associated with @dev, along
 170  * with cleaning up any other stuff.  But we do that in the DRM core, so
 171  * this function can just return and hope that the core does its job.
 172  */
 173 static void drm_sysfs_device_release(struct device *dev)
 174 {
 175         memset(dev, 0, sizeof(struct device));
 176         return;
 177 }
 178
 179 /*
 180  * Connector properties
 181  */
 182 static ssize_t status_show(struct device *device,
 183                            struct device_attribute *attr,
 184                            char *buf)
 185 {
 186         struct drm_connector *connector = to_drm_connector(device);
 187         enum drm_connector_status status;
 188         int ret;
 189
 190         ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
 191         if (ret)
 192                 return ret;
 193
 194         status = connector->funcs->detect(connector, true);
 195         mutex_unlock(&connector->dev->mode_config.mutex);
 196
 197         return snprintf(buf, PAGE_SIZE, "%s\n",
 198                         drm_get_connector_status_name(status));
 199 }
 200
 201 static ssize_t dpms_show(struct device *device,
 202                            struct device_attribute *attr,
 203                            char *buf)
 204 {
 205         struct drm_connector *connector = to_drm_connector(device);
 206         struct drm_device *dev = connector->dev;
 207         uint64_t dpms_status;
 208         int ret;
 209
 210         ret = drm_object_property_get_value(&connector->base,
 211                                             dev->mode_config.dpms_property,
 212                                             &dpms_status);
 213         if (ret)
 214                 return 0;
 215
 216         return snprintf(buf, PAGE_SIZE, "%s\n",
 217                         drm_get_dpms_name((int)dpms_status));
 218 }
 219
 220 static ssize_t enabled_show(struct device *device,
 221                             struct device_attribute *attr,
 222                            char *buf)
 223 {
 224         struct drm_connector *connector = to_drm_connector(device);
 225
 226         return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
 227                         "disabled");
 228 }
 229
 230 static ssize_t edid_show(struct file *filp, struct kobject *kobj,
 231                          struct bin_attribute *attr, char *buf, loff_t off,
 232                          size_t count)
 233 {
 234         struct device *connector_dev = container_of(kobj, struct device, kobj);
 235         struct drm_connector *connector = to_drm_connector(connector_dev);
 236         unsigned char *edid;
 237         size_t size;
 238
 239         if (!connector->edid_blob_ptr)
 240                 return 0;
 241
 242         edid = connector->edid_blob_ptr->data;
 243         size = connector->edid_blob_ptr->length;
 244         if (!edid)
 245                 return 0;
 246
 247         if (off >= size)
 248                 return 0;
 249
 250         if (off + count > size)
 251                 count = size - off;
 252         memcpy(buf, edid + off, count);
 253
 254         return count;
 255 }
 256
 257 static ssize_t modes_show(struct device *device,
 258                            struct device_attribute *attr,
 259                            char *buf)
 260 {
 261         struct drm_connector *connector = to_drm_connector(device);
 262         struct drm_display_mode *mode;
 263         int written = 0;
 264
 265         list_for_each_entry(mode, &connector->modes, head) {
 266                 written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
 267                                     mode->name);
 268         }
 269
 270         return written;
 271 }
 272
 273 static ssize_t subconnector_show(struct device *device,
 274                            struct device_attribute *attr,
 275                            char *buf)
 276 {
 277         struct drm_connector *connector = to_drm_connector(device);
 278         struct drm_device *dev = connector->dev;
 279         struct drm_property *prop = NULL;
 280         uint64_t subconnector;
 281         int is_tv = 0;
 282         int ret;
 283
 284         switch (connector->connector_type) {
 285                 case DRM_MODE_CONNECTOR_DVII:
 286                         prop = dev->mode_config.dvi_i_subconnector_property;
 287                         break;
 288                 case DRM_MODE_CONNECTOR_Composite:
 289                 case DRM_MODE_CONNECTOR_SVIDEO:
 290                 case DRM_MODE_CONNECTOR_Component:
 291                 case DRM_MODE_CONNECTOR_TV:
 292                         prop = dev->mode_config.tv_subconnector_property;
 293                         is_tv = 1;
 294                         break;
 295                 default:
 296                         DRM_ERROR("Wrong connector type for this property\n");
 297                         return 0;
 298         }
 299
 300         if (!prop) {
 301                 DRM_ERROR("Unable to find subconnector property\n");
 302                 return 0;
 303         }
 304
 305         ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
 306         if (ret)
 307                 return 0;
 308
 309         return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
 310                         drm_get_tv_subconnector_name((int)subconnector) :
 311                         drm_get_dvi_i_subconnector_name((int)subconnector));
 312 }
 313
 314 static ssize_t select_subconnector_show(struct device *device,
 315                            struct device_attribute *attr,
 316                            char *buf)
 317 {
 318         struct drm_connector *connector = to_drm_connector(device);
 319         struct drm_device *dev = connector->dev;
 320         struct drm_property *prop = NULL;
 321         uint64_t subconnector;
 322         int is_tv = 0;
 323         int ret;
 324
 325         switch (connector->connector_type) {
 326                 case DRM_MODE_CONNECTOR_DVII:
 327                         prop = dev->mode_config.dvi_i_select_subconnector_property;
 328                         break;
 329                 case DRM_MODE_CONNECTOR_Composite:
 330                 case DRM_MODE_CONNECTOR_SVIDEO:
 331                 case DRM_MODE_CONNECTOR_Component:
 332                 case DRM_MODE_CONNECTOR_TV:
 333                         prop = dev->mode_config.tv_select_subconnector_property;
 334                         is_tv = 1;
 335                         break;
 336                 default:
 337                         DRM_ERROR("Wrong connector type for this property\n");
 338                         return 0;
 339         }
 340
 341         if (!prop) {
 342                 DRM_ERROR("Unable to find select subconnector property\n");
 343                 return 0;
 344         }
 345
 346         ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
 347         if (ret)
 348                 return 0;
 349
 350         return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
 351                         drm_get_tv_select_name((int)subconnector) :
 352                         drm_get_dvi_i_select_name((int)subconnector));
 353 }
 354
 355 static struct device_attribute connector_attrs[] = {
 356         __ATTR_RO(status),
 357         __ATTR_RO(enabled),
 358         __ATTR_RO(dpms),
 359         __ATTR_RO(modes),
 360 };
 361
 362 /* These attributes are for both DVI-I connectors and all types of tv-out. */
 363 static struct device_attribute connector_attrs_opt1[] = {
 364         __ATTR_RO(subconnector),
 365         __ATTR_RO(select_subconnector),
 366 };
 367
 368 static struct bin_attribute edid_attr = {
 369         .attr.name = "edid",
 370         .attr.mode = 0444,
 371         .size = 0,
 372         .read = edid_show,
 373 };
 374
 375 /**
 376  * drm_sysfs_connector_add - add a connector to sysfs
 377  * @connector: connector to add
 378  *
 379  * Create a connector device in sysfs, along with its associated connector
 380  * properties (so far, connection status, dpms, mode list & edid) and
 381  * generate a hotplug event so userspace knows there's a new connector
 382  * available.
 383  *
 384  * Note:
 385  * This routine should only be called *once* for each registered connector.
 386  * A second call for an already registered connector will trigger the BUG_ON
 387  * below.
 388  */
 389 int drm_sysfs_connector_add(struct drm_connector *connector)
 390 {
 391         struct drm_device *dev = connector->dev;
 392         int attr_cnt = 0;
 393         int opt_cnt = 0;
 394         int i;
 395         int ret;
 396
 397         /* We shouldn't get called more than once for the same connector */
 398         BUG_ON(device_is_registered(&connector->kdev));
 399
 400         connector->kdev.parent = &dev->primary->kdev;
 401         connector->kdev.class = drm_class;
 402         connector->kdev.release = drm_sysfs_device_release;
 403
 404         DRM_DEBUG("adding \"%s\" to sysfs\n",
 405                   drm_get_connector_name(connector));
 406
 407         dev_set_name(&connector->kdev, "card%d-%s",
 408                      dev->primary->index, drm_get_connector_name(connector));
 409         ret = device_register(&connector->kdev);
 410
 411         if (ret) {
 412                 DRM_ERROR("failed to register connector device: %d\n", ret);
 413                 goto out;
 414         }
 415
 416         /* Standard attributes */
 417
 418         for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
 419                 ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]);
 420                 if (ret)
 421                         goto err_out_files;
 422         }
 423
 424         /* Optional attributes */
 425         /*
 426          * In the long run it maybe a good idea to make one set of
 427          * optionals per connector type.
 428          */
 429         switch (connector->connector_type) {
 430                 case DRM_MODE_CONNECTOR_DVII:
 431                 case DRM_MODE_CONNECTOR_Composite:
 432                 case DRM_MODE_CONNECTOR_SVIDEO:
 433                 case DRM_MODE_CONNECTOR_Component:
 434                 case DRM_MODE_CONNECTOR_TV:
 435                         for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
 436                                 ret = device_create_file(&connector->kdev, &connector_attrs_opt1[opt_cnt]);
 437                                 if (ret)
 438                                         goto err_out_files;
 439                         }
 440                         break;
 441                 default:
 442                         break;
 443         }
 444
 445         ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
 446         if (ret)
 447                 goto err_out_files;
 448
 449         /* Let userspace know we have a new connector */
 450         drm_sysfs_hotplug_event(dev);
 451
 452         return 0;
 453
 454 err_out_files:
 455         for (i = 0; i < opt_cnt; i++)
 456                 device_remove_file(&connector->kdev, &connector_attrs_opt1[i]);
 457         for (i = 0; i < attr_cnt; i++)
 458                 device_remove_file(&connector->kdev, &connector_attrs[i]);
 459         device_unregister(&connector->kdev);
 460
 461 out:
 462         return ret;
 463 }
 464 EXPORT_SYMBOL(drm_sysfs_connector_add);
 465
 466 /**
 467  * drm_sysfs_connector_remove - remove an connector device from sysfs
 468  * @connector: connector to remove
 469  *
 470  * Remove @connector and its associated attributes from sysfs.  Note that
 471  * the device model core will take care of sending the "remove" uevent
 472  * at this time, so we don't need to do it.
 473  *
 474  * Note:
 475  * This routine should only be called if the connector was previously
 476  * successfully registered.  If @connector hasn't been registered yet,
 477  * you'll likely see a panic somewhere deep in sysfs code when called.
 478  */
 479 void drm_sysfs_connector_remove(struct drm_connector *connector)
 480 {
 481         int i;
 482
 483         if (!connector->kdev.parent)
 484                 return;
 485         DRM_DEBUG("removing \"%s\" from sysfs\n",
 486                   drm_get_connector_name(connector));
 487
 488         for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
 489                 device_remove_file(&connector->kdev, &connector_attrs[i]);
 490         sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
 491         device_unregister(&connector->kdev);
 492         connector->kdev.parent = NULL;
 493 }
 494 EXPORT_SYMBOL(drm_sysfs_connector_remove);
 495
 496 /**
 497  * drm_sysfs_hotplug_event - generate a DRM uevent
 498  * @dev: DRM device
 499  *
 500  * Send a uevent for the DRM device specified by @dev.  Currently we only
 501  * set HOTPLUG=1 in the uevent environment, but this could be expanded to
 502  * deal with other types of events.
 503  */
 504 void drm_sysfs_hotplug_event(struct drm_device *dev)
 505 {
 506         char *event_string = "HOTPLUG=1";
 507         char *envp[] = { event_string, NULL };
 508
 509         DRM_DEBUG("generating hotplug event\n");
 510
 511         kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
 512 }
 513 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
 514
 515 /**
 516  * drm_sysfs_device_add - adds a class device to sysfs for a character driver
 517  * @dev: DRM device to be added
 518  * @head: DRM head in question
 519  *
 520  * Add a DRM device to the DRM's device model class.  We use @dev's PCI device
 521  * as the parent for the Linux device, and make sure it has a file containing
 522  * the driver we're using (for userspace compatibility).
 523  */
 524 int drm_sysfs_device_add(struct drm_minor *minor)
 525 {
 526         int err;
 527         char *minor_str;
 528
 529         minor->kdev.parent = minor->dev->dev;
 530
 531         minor->kdev.class = drm_class;
 532         minor->kdev.release = drm_sysfs_device_release;
 533         minor->kdev.devt = minor->device;
 534         minor->kdev.type = &drm_sysfs_device_minor;
 535         if (minor->type == DRM_MINOR_CONTROL)
 536                 minor_str = "controlD%d";
 537         else if (minor->type == DRM_MINOR_RENDER)
 538                 minor_str = "renderD%d";
 539         else
 540                 minor_str = "card%d";
 541
 542         dev_set_name(&minor->kdev, minor_str, minor->index);
 543
 544         err = device_register(&minor->kdev);
 545         if (err) {
 546                 DRM_ERROR("device add failed: %d\n", err);
 547                 goto err_out;
 548         }
 549
 550         return 0;
 551
 552 err_out:
 553         return err;
 554 }
 555
 556 /**
 557  * drm_sysfs_device_remove - remove DRM device
 558  * @dev: DRM device to remove
 559  *
 560  * This call unregisters and cleans up a class device that was created with a
 561  * call to drm_sysfs_device_add()
 562  */
 563 void drm_sysfs_device_remove(struct drm_minor *minor)
 564 {
 565         if (minor->kdev.parent)
 566                 device_unregister(&minor->kdev);
 567         minor->kdev.parent = NULL;
 568 }
 569
 570
 571 /**
 572  * drm_class_device_register - Register a struct device in the drm class.
 573  *
 574  * @dev: pointer to struct device to register.
 575  *
 576  * @dev should have all relevant members pre-filled with the exception
 577  * of the class member. In particular, the device_type member must
 578  * be set.
 579  */
 580
 581 int drm_class_device_register(struct device *dev)
 582 {
 583         if (!drm_class || IS_ERR(drm_class))
 584                 return -ENOENT;
 585
 586         dev->class = drm_class;
 587         return device_register(dev);
 588 }
 589 EXPORT_SYMBOL_GPL(drm_class_device_register);
 590
 591 void drm_class_device_unregister(struct device *dev)
 592 {
 593         return device_unregister(dev);
 594 }
 595 EXPORT_SYMBOL_GPL(drm_class_device_unregister);