drm_sysfs.c 16 KB

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  1. /*
  2. * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
  3. * extra sysfs attribute from DRM. Normal drm_sysfs_class
  4. * does not allow adding attributes.
  5. *
  6. * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
  7. * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
  8. * Copyright (c) 2003-2004 IBM Corp.
  9. *
  10. * This file is released under the GPLv2
  11. *
  12. */
  13. #include <linux/device.h>
  14. #include <linux/kdev_t.h>
  15. #include <linux/gfp.h>
  16. #include <linux/err.h>
  17. #include <linux/export.h>
  18. #include <drm/drm_sysfs.h>
  19. #include <drm/drm_core.h>
  20. #include <drm/drmP.h>
  21. #include "drm_internal.h"
  22. #define to_drm_minor(d) dev_get_drvdata(d)
  23. #define to_drm_connector(d) dev_get_drvdata(d)
  24. static struct device_type drm_sysfs_device_minor = {
  25. .name = "drm_minor"
  26. };
  27. /**
  28. * __drm_class_suspend - internal DRM class suspend routine
  29. * @dev: Linux device to suspend
  30. * @state: power state to enter
  31. *
  32. * Just figures out what the actual struct drm_device associated with
  33. * @dev is and calls its suspend hook, if present.
  34. */
  35. static int __drm_class_suspend(struct device *dev, pm_message_t state)
  36. {
  37. if (dev->type == &drm_sysfs_device_minor) {
  38. struct drm_minor *drm_minor = to_drm_minor(dev);
  39. struct drm_device *drm_dev = drm_minor->dev;
  40. if (drm_minor->type == DRM_MINOR_LEGACY &&
  41. !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
  42. drm_dev->driver->suspend)
  43. return drm_dev->driver->suspend(drm_dev, state);
  44. }
  45. return 0;
  46. }
  47. /**
  48. * drm_class_suspend - internal DRM class suspend hook. Simply calls
  49. * __drm_class_suspend() with the correct pm state.
  50. * @dev: Linux device to suspend
  51. */
  52. static int drm_class_suspend(struct device *dev)
  53. {
  54. return __drm_class_suspend(dev, PMSG_SUSPEND);
  55. }
  56. /**
  57. * drm_class_freeze - internal DRM class freeze hook. Simply calls
  58. * __drm_class_suspend() with the correct pm state.
  59. * @dev: Linux device to freeze
  60. */
  61. static int drm_class_freeze(struct device *dev)
  62. {
  63. return __drm_class_suspend(dev, PMSG_FREEZE);
  64. }
  65. /**
  66. * drm_class_resume - DRM class resume hook
  67. * @dev: Linux device to resume
  68. *
  69. * Just figures out what the actual struct drm_device associated with
  70. * @dev is and calls its resume hook, if present.
  71. */
  72. static int drm_class_resume(struct device *dev)
  73. {
  74. if (dev->type == &drm_sysfs_device_minor) {
  75. struct drm_minor *drm_minor = to_drm_minor(dev);
  76. struct drm_device *drm_dev = drm_minor->dev;
  77. if (drm_minor->type == DRM_MINOR_LEGACY &&
  78. !drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
  79. drm_dev->driver->resume)
  80. return drm_dev->driver->resume(drm_dev);
  81. }
  82. return 0;
  83. }
  84. static const struct dev_pm_ops drm_class_dev_pm_ops = {
  85. .suspend = drm_class_suspend,
  86. .resume = drm_class_resume,
  87. .freeze = drm_class_freeze,
  88. };
  89. static char *drm_devnode(struct device *dev, umode_t *mode)
  90. {
  91. return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
  92. }
  93. static CLASS_ATTR_STRING(version, S_IRUGO,
  94. CORE_NAME " "
  95. __stringify(CORE_MAJOR) "."
  96. __stringify(CORE_MINOR) "."
  97. __stringify(CORE_PATCHLEVEL) " "
  98. CORE_DATE);
  99. /**
  100. * drm_sysfs_create - create a struct drm_sysfs_class structure
  101. * @owner: pointer to the module that is to "own" this struct drm_sysfs_class
  102. * @name: pointer to a string for the name of this class.
  103. *
  104. * This is used to create DRM class pointer that can then be used
  105. * in calls to drm_sysfs_device_add().
  106. *
  107. * Note, the pointer created here is to be destroyed when finished by making a
  108. * call to drm_sysfs_destroy().
  109. */
  110. struct class *drm_sysfs_create(struct module *owner, char *name)
  111. {
  112. struct class *class;
  113. int err;
  114. class = class_create(owner, name);
  115. if (IS_ERR(class)) {
  116. err = PTR_ERR(class);
  117. goto err_out;
  118. }
  119. class->pm = &drm_class_dev_pm_ops;
  120. err = class_create_file(class, &class_attr_version.attr);
  121. if (err)
  122. goto err_out_class;
  123. class->devnode = drm_devnode;
  124. return class;
  125. err_out_class:
  126. class_destroy(class);
  127. err_out:
  128. return ERR_PTR(err);
  129. }
  130. /**
  131. * drm_sysfs_destroy - destroys DRM class
  132. *
  133. * Destroy the DRM device class.
  134. */
  135. void drm_sysfs_destroy(void)
  136. {
  137. if ((drm_class == NULL) || (IS_ERR(drm_class)))
  138. return;
  139. class_remove_file(drm_class, &class_attr_version.attr);
  140. class_destroy(drm_class);
  141. drm_class = NULL;
  142. }
  143. /*
  144. * Connector properties
  145. */
  146. static ssize_t status_store(struct device *device,
  147. struct device_attribute *attr,
  148. const char *buf, size_t count)
  149. {
  150. struct drm_connector *connector = to_drm_connector(device);
  151. struct drm_device *dev = connector->dev;
  152. enum drm_connector_status old_status;
  153. int ret;
  154. ret = mutex_lock_interruptible(&dev->mode_config.mutex);
  155. if (ret)
  156. return ret;
  157. old_status = connector->status;
  158. if (sysfs_streq(buf, "detect")) {
  159. connector->force = 0;
  160. connector->status = connector->funcs->detect(connector, true);
  161. } else if (sysfs_streq(buf, "on")) {
  162. connector->force = DRM_FORCE_ON;
  163. } else if (sysfs_streq(buf, "on-digital")) {
  164. connector->force = DRM_FORCE_ON_DIGITAL;
  165. } else if (sysfs_streq(buf, "off")) {
  166. connector->force = DRM_FORCE_OFF;
  167. } else
  168. ret = -EINVAL;
  169. if (ret == 0 && connector->force) {
  170. if (connector->force == DRM_FORCE_ON ||
  171. connector->force == DRM_FORCE_ON_DIGITAL)
  172. connector->status = connector_status_connected;
  173. else
  174. connector->status = connector_status_disconnected;
  175. if (connector->funcs->force)
  176. connector->funcs->force(connector);
  177. }
  178. if (old_status != connector->status) {
  179. DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
  180. connector->base.id,
  181. connector->name,
  182. old_status, connector->status);
  183. dev->mode_config.delayed_event = true;
  184. if (dev->mode_config.poll_enabled)
  185. schedule_delayed_work(&dev->mode_config.output_poll_work,
  186. 0);
  187. }
  188. mutex_unlock(&dev->mode_config.mutex);
  189. return ret ? ret : count;
  190. }
  191. static ssize_t status_show(struct device *device,
  192. struct device_attribute *attr,
  193. char *buf)
  194. {
  195. struct drm_connector *connector = to_drm_connector(device);
  196. return snprintf(buf, PAGE_SIZE, "%s\n",
  197. drm_get_connector_status_name(connector->status));
  198. }
  199. static ssize_t dpms_show(struct device *device,
  200. struct device_attribute *attr,
  201. char *buf)
  202. {
  203. struct drm_connector *connector = to_drm_connector(device);
  204. int dpms;
  205. dpms = READ_ONCE(connector->dpms);
  206. return snprintf(buf, PAGE_SIZE, "%s\n",
  207. drm_get_dpms_name(dpms));
  208. }
  209. static ssize_t enabled_show(struct device *device,
  210. struct device_attribute *attr,
  211. char *buf)
  212. {
  213. struct drm_connector *connector = to_drm_connector(device);
  214. return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
  215. "disabled");
  216. }
  217. static ssize_t edid_show(struct file *filp, struct kobject *kobj,
  218. struct bin_attribute *attr, char *buf, loff_t off,
  219. size_t count)
  220. {
  221. struct device *connector_dev = container_of(kobj, struct device, kobj);
  222. struct drm_connector *connector = to_drm_connector(connector_dev);
  223. unsigned char *edid;
  224. size_t size;
  225. if (!connector->edid_blob_ptr)
  226. return 0;
  227. edid = connector->edid_blob_ptr->data;
  228. size = connector->edid_blob_ptr->length;
  229. if (!edid)
  230. return 0;
  231. if (off >= size)
  232. return 0;
  233. if (off + count > size)
  234. count = size - off;
  235. memcpy(buf, edid + off, count);
  236. return count;
  237. }
  238. static ssize_t modes_show(struct device *device,
  239. struct device_attribute *attr,
  240. char *buf)
  241. {
  242. struct drm_connector *connector = to_drm_connector(device);
  243. struct drm_display_mode *mode;
  244. int written = 0;
  245. list_for_each_entry(mode, &connector->modes, head) {
  246. written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
  247. mode->name);
  248. }
  249. return written;
  250. }
  251. static ssize_t tv_subconnector_show(struct device *device,
  252. struct device_attribute *attr,
  253. char *buf)
  254. {
  255. struct drm_connector *connector = to_drm_connector(device);
  256. struct drm_device *dev = connector->dev;
  257. struct drm_property *prop;
  258. uint64_t subconnector;
  259. int ret;
  260. prop = dev->mode_config.tv_subconnector_property;
  261. if (!prop) {
  262. DRM_ERROR("Unable to find subconnector property\n");
  263. return 0;
  264. }
  265. ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
  266. if (ret)
  267. return 0;
  268. return snprintf(buf, PAGE_SIZE, "%s",
  269. drm_get_tv_subconnector_name((int)subconnector));
  270. }
  271. static ssize_t tv_select_subconnector_show(struct device *device,
  272. struct device_attribute *attr,
  273. char *buf)
  274. {
  275. struct drm_connector *connector = to_drm_connector(device);
  276. struct drm_device *dev = connector->dev;
  277. struct drm_property *prop;
  278. uint64_t subconnector;
  279. int ret;
  280. prop = dev->mode_config.tv_select_subconnector_property;
  281. if (!prop) {
  282. DRM_ERROR("Unable to find select subconnector property\n");
  283. return 0;
  284. }
  285. ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
  286. if (ret)
  287. return 0;
  288. return snprintf(buf, PAGE_SIZE, "%s",
  289. drm_get_tv_select_name((int)subconnector));
  290. }
  291. static ssize_t dvii_subconnector_show(struct device *device,
  292. struct device_attribute *attr,
  293. char *buf)
  294. {
  295. struct drm_connector *connector = to_drm_connector(device);
  296. struct drm_device *dev = connector->dev;
  297. struct drm_property *prop;
  298. uint64_t subconnector;
  299. int ret;
  300. prop = dev->mode_config.dvi_i_subconnector_property;
  301. if (!prop) {
  302. DRM_ERROR("Unable to find subconnector property\n");
  303. return 0;
  304. }
  305. ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
  306. if (ret)
  307. return 0;
  308. return snprintf(buf, PAGE_SIZE, "%s",
  309. drm_get_dvi_i_subconnector_name((int)subconnector));
  310. }
  311. static ssize_t dvii_select_subconnector_show(struct device *device,
  312. struct device_attribute *attr,
  313. char *buf)
  314. {
  315. struct drm_connector *connector = to_drm_connector(device);
  316. struct drm_device *dev = connector->dev;
  317. struct drm_property *prop;
  318. uint64_t subconnector;
  319. int ret;
  320. prop = dev->mode_config.dvi_i_select_subconnector_property;
  321. if (!prop) {
  322. DRM_ERROR("Unable to find select subconnector property\n");
  323. return 0;
  324. }
  325. ret = drm_object_property_get_value(&connector->base, prop, &subconnector);
  326. if (ret)
  327. return 0;
  328. return snprintf(buf, PAGE_SIZE, "%s",
  329. drm_get_dvi_i_select_name((int)subconnector));
  330. }
  331. static DEVICE_ATTR_RW(status);
  332. static DEVICE_ATTR_RO(enabled);
  333. static DEVICE_ATTR_RO(dpms);
  334. static DEVICE_ATTR_RO(modes);
  335. static struct attribute *connector_dev_attrs[] = {
  336. &dev_attr_status.attr,
  337. &dev_attr_enabled.attr,
  338. &dev_attr_dpms.attr,
  339. &dev_attr_modes.attr,
  340. NULL
  341. };
  342. static DEVICE_ATTR_RO(tv_subconnector);
  343. static DEVICE_ATTR_RO(tv_select_subconnector);
  344. static struct attribute *connector_tv_dev_attrs[] = {
  345. &dev_attr_tv_subconnector.attr,
  346. &dev_attr_tv_select_subconnector.attr,
  347. NULL
  348. };
  349. static DEVICE_ATTR_RO(dvii_subconnector);
  350. static DEVICE_ATTR_RO(dvii_select_subconnector);
  351. static struct attribute *connector_dvii_dev_attrs[] = {
  352. &dev_attr_dvii_subconnector.attr,
  353. &dev_attr_dvii_select_subconnector.attr,
  354. NULL
  355. };
  356. /* Connector type related helpers */
  357. static int kobj_connector_type(struct kobject *kobj)
  358. {
  359. struct device *dev = kobj_to_dev(kobj);
  360. struct drm_connector *connector = to_drm_connector(dev);
  361. return connector->connector_type;
  362. }
  363. static umode_t connector_is_dvii(struct kobject *kobj,
  364. struct attribute *attr, int idx)
  365. {
  366. return kobj_connector_type(kobj) == DRM_MODE_CONNECTOR_DVII ?
  367. attr->mode : 0;
  368. }
  369. static umode_t connector_is_tv(struct kobject *kobj,
  370. struct attribute *attr, int idx)
  371. {
  372. switch (kobj_connector_type(kobj)) {
  373. case DRM_MODE_CONNECTOR_Composite:
  374. case DRM_MODE_CONNECTOR_SVIDEO:
  375. case DRM_MODE_CONNECTOR_Component:
  376. case DRM_MODE_CONNECTOR_TV:
  377. return attr->mode;
  378. }
  379. return 0;
  380. }
  381. static struct bin_attribute edid_attr = {
  382. .attr.name = "edid",
  383. .attr.mode = 0444,
  384. .size = 0,
  385. .read = edid_show,
  386. };
  387. static struct bin_attribute *connector_bin_attrs[] = {
  388. &edid_attr,
  389. NULL
  390. };
  391. static const struct attribute_group connector_dev_group = {
  392. .attrs = connector_dev_attrs,
  393. .bin_attrs = connector_bin_attrs,
  394. };
  395. static const struct attribute_group connector_tv_dev_group = {
  396. .attrs = connector_tv_dev_attrs,
  397. .is_visible = connector_is_tv,
  398. };
  399. static const struct attribute_group connector_dvii_dev_group = {
  400. .attrs = connector_dvii_dev_attrs,
  401. .is_visible = connector_is_dvii,
  402. };
  403. static const struct attribute_group *connector_dev_groups[] = {
  404. &connector_dev_group,
  405. &connector_tv_dev_group,
  406. &connector_dvii_dev_group,
  407. NULL
  408. };
  409. /**
  410. * drm_sysfs_connector_add - add a connector to sysfs
  411. * @connector: connector to add
  412. *
  413. * Create a connector device in sysfs, along with its associated connector
  414. * properties (so far, connection status, dpms, mode list & edid) and
  415. * generate a hotplug event so userspace knows there's a new connector
  416. * available.
  417. */
  418. int drm_sysfs_connector_add(struct drm_connector *connector)
  419. {
  420. struct drm_device *dev = connector->dev;
  421. if (connector->kdev)
  422. return 0;
  423. connector->kdev =
  424. device_create_with_groups(drm_class, dev->primary->kdev, 0,
  425. connector, connector_dev_groups,
  426. "card%d-%s", dev->primary->index,
  427. connector->name);
  428. DRM_DEBUG("adding \"%s\" to sysfs\n",
  429. connector->name);
  430. if (IS_ERR(connector->kdev)) {
  431. DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
  432. return PTR_ERR(connector->kdev);
  433. }
  434. /* Let userspace know we have a new connector */
  435. drm_sysfs_hotplug_event(dev);
  436. return 0;
  437. }
  438. /**
  439. * drm_sysfs_connector_remove - remove an connector device from sysfs
  440. * @connector: connector to remove
  441. *
  442. * Remove @connector and its associated attributes from sysfs. Note that
  443. * the device model core will take care of sending the "remove" uevent
  444. * at this time, so we don't need to do it.
  445. *
  446. * Note:
  447. * This routine should only be called if the connector was previously
  448. * successfully registered. If @connector hasn't been registered yet,
  449. * you'll likely see a panic somewhere deep in sysfs code when called.
  450. */
  451. void drm_sysfs_connector_remove(struct drm_connector *connector)
  452. {
  453. if (!connector->kdev)
  454. return;
  455. DRM_DEBUG("removing \"%s\" from sysfs\n",
  456. connector->name);
  457. device_unregister(connector->kdev);
  458. connector->kdev = NULL;
  459. }
  460. /**
  461. * drm_sysfs_hotplug_event - generate a DRM uevent
  462. * @dev: DRM device
  463. *
  464. * Send a uevent for the DRM device specified by @dev. Currently we only
  465. * set HOTPLUG=1 in the uevent environment, but this could be expanded to
  466. * deal with other types of events.
  467. */
  468. void drm_sysfs_hotplug_event(struct drm_device *dev)
  469. {
  470. char *event_string = "HOTPLUG=1";
  471. char *envp[] = { event_string, NULL };
  472. DRM_DEBUG("generating hotplug event\n");
  473. kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
  474. }
  475. EXPORT_SYMBOL(drm_sysfs_hotplug_event);
  476. static void drm_sysfs_release(struct device *dev)
  477. {
  478. kfree(dev);
  479. }
  480. /**
  481. * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
  482. * @minor: minor to allocate sysfs device for
  483. *
  484. * This allocates a new sysfs device for @minor and returns it. The device is
  485. * not registered nor linked. The caller has to use device_add() and
  486. * device_del() to register and unregister it.
  487. *
  488. * Note that dev_get_drvdata() on the new device will return the minor.
  489. * However, the device does not hold a ref-count to the minor nor to the
  490. * underlying drm_device. This is unproblematic as long as you access the
  491. * private data only in sysfs callbacks. device_del() disables those
  492. * synchronously, so they cannot be called after you cleanup a minor.
  493. */
  494. struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
  495. {
  496. const char *minor_str;
  497. struct device *kdev;
  498. int r;
  499. if (minor->type == DRM_MINOR_CONTROL)
  500. minor_str = "controlD%d";
  501. else if (minor->type == DRM_MINOR_RENDER)
  502. minor_str = "renderD%d";
  503. else
  504. minor_str = "card%d";
  505. kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
  506. if (!kdev)
  507. return ERR_PTR(-ENOMEM);
  508. device_initialize(kdev);
  509. kdev->devt = MKDEV(DRM_MAJOR, minor->index);
  510. kdev->class = drm_class;
  511. kdev->type = &drm_sysfs_device_minor;
  512. kdev->parent = minor->dev->dev;
  513. kdev->release = drm_sysfs_release;
  514. dev_set_drvdata(kdev, minor);
  515. r = dev_set_name(kdev, minor_str, minor->index);
  516. if (r < 0)
  517. goto err_free;
  518. return kdev;
  519. err_free:
  520. put_device(kdev);
  521. return ERR_PTR(r);
  522. }
  523. /**
  524. * drm_class_device_register - Register a struct device in the drm class.
  525. *
  526. * @dev: pointer to struct device to register.
  527. *
  528. * @dev should have all relevant members pre-filled with the exception
  529. * of the class member. In particular, the device_type member must
  530. * be set.
  531. */
  532. int drm_class_device_register(struct device *dev)
  533. {
  534. if (!drm_class || IS_ERR(drm_class))
  535. return -ENOENT;
  536. dev->class = drm_class;
  537. return device_register(dev);
  538. }
  539. EXPORT_SYMBOL_GPL(drm_class_device_register);
  540. void drm_class_device_unregister(struct device *dev)
  541. {
  542. return device_unregister(dev);
  543. }
  544. EXPORT_SYMBOL_GPL(drm_class_device_unregister);