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) dev_get_drvdata(d)
  26 #define to_drm_connector(d) dev_get_drvdata(d)
  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  * Connector properties
 167  */
 168 static 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
 187 static 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
 206 static 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
 216 static 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
 243 static 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
 259 static 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
 300 static 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
 341 static 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. */
 349 static struct device_attribute connector_attrs_opt1[] = {
 350         __ATTR_RO(subconnector),
 351         __ATTR_RO(select_subconnector),
 352 };
 353
 354 static 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  *
 370  * Note:
 371  * This routine should only be called *once* for each registered connector.
 372  * A second call for an already registered connector will trigger the BUG_ON
 373  * below.
 374  */
 375 int drm_sysfs_connector_add(struct drm_connector *connector)
 376 {
 377         struct drm_device *dev = connector->dev;
 378         int attr_cnt = 0;
 379         int opt_cnt = 0;
 380         int i;
 381         int ret;
 382
 383         if (connector->kdev)
 384                 return 0;
 385
 386         /* We shouldn't get called more than once for the same connector */
 387         connector->kdev = device_create(drm_class, dev->primary->kdev,
 388                                         0, connector, "card%d-%s",
 389                                         dev->primary->index, drm_get_connector_name(connector));
 390         DRM_DEBUG("adding \"%s\" to sysfs\n",
 391                   drm_get_connector_name(connector));
 392
 393         if (IS_ERR(connector->kdev)) {
 394                 DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
 395                 ret = PTR_ERR(connector->kdev);
 396                 goto out;
 397         }
 398
 399         /* Standard attributes */
 400
 401         for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
 402                 ret = device_create_file(connector->kdev, &connector_attrs[attr_cnt]);
 403                 if (ret)
 404                         goto err_out_files;
 405         }
 406
 407         /* Optional attributes */
 408         /*
 409          * In the long run it maybe a good idea to make one set of
 410          * optionals per connector type.
 411          */
 412         switch (connector->connector_type) {
 413                 case DRM_MODE_CONNECTOR_DVII:
 414                 case DRM_MODE_CONNECTOR_Composite:
 415                 case DRM_MODE_CONNECTOR_SVIDEO:
 416                 case DRM_MODE_CONNECTOR_Component:
 417                 case DRM_MODE_CONNECTOR_TV:
 418                         for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
 419                                 ret = device_create_file(connector->kdev, &connector_attrs_opt1[opt_cnt]);
 420                                 if (ret)
 421                                         goto err_out_files;
 422                         }
 423                         break;
 424                 default:
 425                         break;
 426         }
 427
 428         ret = sysfs_create_bin_file(&connector->kdev->kobj, &edid_attr);
 429         if (ret)
 430                 goto err_out_files;
 431
 432         /* Let userspace know we have a new connector */
 433         drm_sysfs_hotplug_event(dev);
 434
 435         return 0;
 436
 437 err_out_files:
 438         for (i = 0; i < opt_cnt; i++)
 439                 device_remove_file(connector->kdev, &connector_attrs_opt1[i]);
 440         for (i = 0; i < attr_cnt; i++)
 441                 device_remove_file(connector->kdev, &connector_attrs[i]);
 442         device_unregister(connector->kdev);
 443
 444 out:
 445         return ret;
 446 }
 447 EXPORT_SYMBOL(drm_sysfs_connector_add);
 448
 449 /**
 450  * drm_sysfs_connector_remove - remove an connector device from sysfs
 451  * @connector: connector to remove
 452  *
 453  * Remove @connector and its associated attributes from sysfs.  Note that
 454  * the device model core will take care of sending the "remove" uevent
 455  * at this time, so we don't need to do it.
 456  *
 457  * Note:
 458  * This routine should only be called if the connector was previously
 459  * successfully registered.  If @connector hasn't been registered yet,
 460  * you'll likely see a panic somewhere deep in sysfs code when called.
 461  */
 462 void drm_sysfs_connector_remove(struct drm_connector *connector)
 463 {
 464         int i;
 465
 466         if (!connector->kdev)
 467                 return;
 468         DRM_DEBUG("removing \"%s\" from sysfs\n",
 469                   drm_get_connector_name(connector));
 470
 471         for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
 472                 device_remove_file(connector->kdev, &connector_attrs[i]);
 473         sysfs_remove_bin_file(&connector->kdev->kobj, &edid_attr);
 474         device_unregister(connector->kdev);
 475         connector->kdev = NULL;
 476 }
 477 EXPORT_SYMBOL(drm_sysfs_connector_remove);
 478
 479 /**
 480  * drm_sysfs_hotplug_event - generate a DRM uevent
 481  * @dev: DRM device
 482  *
 483  * Send a uevent for the DRM device specified by @dev.  Currently we only
 484  * set HOTPLUG=1 in the uevent environment, but this could be expanded to
 485  * deal with other types of events.
 486  */
 487 void drm_sysfs_hotplug_event(struct drm_device *dev)
 488 {
 489         char *event_string = "HOTPLUG=1";
 490         char *envp[] = { event_string, NULL };
 491
 492         DRM_DEBUG("generating hotplug event\n");
 493
 494         kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
 495 }
 496 EXPORT_SYMBOL(drm_sysfs_hotplug_event);
 497
 498 /**
 499  * drm_sysfs_device_add - adds a class device to sysfs for a character driver
 500  * @dev: DRM device to be added
 501  * @head: DRM head in question
 502  *
 503  * Add a DRM device to the DRM's device model class.  We use @dev's PCI device
 504  * as the parent for the Linux device, and make sure it has a file containing
 505  * the driver we're using (for userspace compatibility).
 506  */
 507 int drm_sysfs_device_add(struct drm_minor *minor)
 508 {
 509         char *minor_str;
 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 = device_create(drm_class, minor->dev->dev,
 519                                     MKDEV(DRM_MAJOR, minor->index),
 520                                     minor, minor_str, minor->index);
 521         if (IS_ERR(minor->kdev)) {
 522                 DRM_ERROR("device create failed %ld\n", PTR_ERR(minor->kdev));
 523                 return PTR_ERR(minor->kdev);
 524         }
 525         return 0;
 526 }
 527
 528 /**
 529  * drm_sysfs_device_remove - remove DRM device
 530  * @dev: DRM device to remove
 531  *
 532  * This call unregisters and cleans up a class device that was created with a
 533  * call to drm_sysfs_device_add()
 534  */
 535 void drm_sysfs_device_remove(struct drm_minor *minor)
 536 {
 537         if (minor->kdev)
 538                 device_destroy(drm_class, MKDEV(DRM_MAJOR, minor->index));
 539         minor->kdev = NULL;
 540 }
 541
 542
 543 /**
 544  * drm_class_device_register - Register a struct device in the drm class.
 545  *
 546  * @dev: pointer to struct device to register.
 547  *
 548  * @dev should have all relevant members pre-filled with the exception
 549  * of the class member. In particular, the device_type member must
 550  * be set.
 551  */
 552
 553 int drm_class_device_register(struct device *dev)
 554 {
 555         if (!drm_class || IS_ERR(drm_class))
 556                 return -ENOENT;
 557
 558         dev->class = drm_class;
 559         return device_register(dev);
 560 }
 561 EXPORT_SYMBOL_GPL(drm_class_device_register);
 562
 563 void drm_class_device_unregister(struct device *dev)
 564 {
 565         return device_unregister(dev);
 566 }
 567 EXPORT_SYMBOL_GPL(drm_class_device_unregister);