Commit | Line | Data |
---|---|---|
0650fd58 | 1 | |
1da177e4 LT |
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 | ||
1da177e4 LT |
15 | #include <linux/device.h> |
16 | #include <linux/kdev_t.h> | |
5a0e3ad6 | 17 | #include <linux/gfp.h> |
1da177e4 | 18 | #include <linux/err.h> |
2d1a8a48 | 19 | #include <linux/export.h> |
1da177e4 | 20 | |
760285e7 DH |
21 | #include <drm/drm_sysfs.h> |
22 | #include <drm/drm_core.h> | |
23 | #include <drm/drmP.h> | |
67d0ec4e | 24 | #include "drm_internal.h" |
1da177e4 | 25 | |
5bdebb18 DA |
26 | #define to_drm_minor(d) dev_get_drvdata(d) |
27 | #define to_drm_connector(d) dev_get_drvdata(d) | |
e8b962b6 | 28 | |
08e4d534 TH |
29 | static struct device_type drm_sysfs_device_minor = { |
30 | .name = "drm_minor" | |
31 | }; | |
32 | ||
fcc90213 DH |
33 | struct class *drm_class; |
34 | ||
e8b962b6 | 35 | /** |
cf4b91f2 | 36 | * __drm_class_suspend - internal DRM class suspend routine |
e8b962b6 JB |
37 | * @dev: Linux device to suspend |
38 | * @state: power state to enter | |
39 | * | |
40 | * Just figures out what the actual struct drm_device associated with | |
41 | * @dev is and calls its suspend hook, if present. | |
42 | */ | |
cf4b91f2 | 43 | static int __drm_class_suspend(struct device *dev, pm_message_t state) |
e8b962b6 | 44 | { |
08e4d534 TH |
45 | if (dev->type == &drm_sysfs_device_minor) { |
46 | struct drm_minor *drm_minor = to_drm_minor(dev); | |
47 | struct drm_device *drm_dev = drm_minor->dev; | |
48 | ||
49 | if (drm_minor->type == DRM_MINOR_LEGACY && | |
50 | !drm_core_check_feature(drm_dev, DRIVER_MODESET) && | |
51 | drm_dev->driver->suspend) | |
52 | return drm_dev->driver->suspend(drm_dev, state); | |
53 | } | |
e8b962b6 JB |
54 | return 0; |
55 | } | |
56 | ||
cf4b91f2 SK |
57 | /** |
58 | * drm_class_suspend - internal DRM class suspend hook. Simply calls | |
59 | * __drm_class_suspend() with the correct pm state. | |
60 | * @dev: Linux device to suspend | |
61 | */ | |
62 | static int drm_class_suspend(struct device *dev) | |
63 | { | |
64 | return __drm_class_suspend(dev, PMSG_SUSPEND); | |
65 | } | |
66 | ||
67 | /** | |
68 | * drm_class_freeze - internal DRM class freeze hook. Simply calls | |
69 | * __drm_class_suspend() with the correct pm state. | |
70 | * @dev: Linux device to freeze | |
71 | */ | |
72 | static int drm_class_freeze(struct device *dev) | |
73 | { | |
74 | return __drm_class_suspend(dev, PMSG_FREEZE); | |
75 | } | |
76 | ||
e8b962b6 | 77 | /** |
08e4d534 | 78 | * drm_class_resume - DRM class resume hook |
e8b962b6 JB |
79 | * @dev: Linux device to resume |
80 | * | |
81 | * Just figures out what the actual struct drm_device associated with | |
82 | * @dev is and calls its resume hook, if present. | |
83 | */ | |
08e4d534 | 84 | static int drm_class_resume(struct device *dev) |
e8b962b6 | 85 | { |
08e4d534 TH |
86 | if (dev->type == &drm_sysfs_device_minor) { |
87 | struct drm_minor *drm_minor = to_drm_minor(dev); | |
88 | struct drm_device *drm_dev = drm_minor->dev; | |
89 | ||
90 | if (drm_minor->type == DRM_MINOR_LEGACY && | |
91 | !drm_core_check_feature(drm_dev, DRIVER_MODESET) && | |
92 | drm_dev->driver->resume) | |
93 | return drm_dev->driver->resume(drm_dev); | |
94 | } | |
e8b962b6 JB |
95 | return 0; |
96 | } | |
97 | ||
cf4b91f2 SK |
98 | static const struct dev_pm_ops drm_class_dev_pm_ops = { |
99 | .suspend = drm_class_suspend, | |
100 | .resume = drm_class_resume, | |
101 | .freeze = drm_class_freeze, | |
102 | }; | |
103 | ||
2c9ede55 | 104 | static char *drm_devnode(struct device *dev, umode_t *mode) |
02200d06 KS |
105 | { |
106 | return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev)); | |
107 | } | |
108 | ||
0933e2d9 AK |
109 | static CLASS_ATTR_STRING(version, S_IRUGO, |
110 | CORE_NAME " " | |
111 | __stringify(CORE_MAJOR) "." | |
112 | __stringify(CORE_MINOR) "." | |
113 | __stringify(CORE_PATCHLEVEL) " " | |
114 | CORE_DATE); | |
1da177e4 LT |
115 | |
116 | /** | |
fcc90213 DH |
117 | * drm_sysfs_init - initialize sysfs helpers |
118 | * | |
119 | * This is used to create the DRM class, which is the implicit parent of any | |
120 | * other top-level DRM sysfs objects. | |
1da177e4 | 121 | * |
fcc90213 | 122 | * You must call drm_sysfs_destroy() to release the allocated resources. |
1da177e4 | 123 | * |
fcc90213 | 124 | * Return: 0 on success, negative error code on failure. |
1da177e4 | 125 | */ |
fcc90213 | 126 | int drm_sysfs_init(void) |
1da177e4 | 127 | { |
24f73c92 | 128 | int err; |
0650fd58 | 129 | |
fcc90213 DH |
130 | drm_class = class_create(THIS_MODULE, "drm"); |
131 | if (IS_ERR(drm_class)) | |
132 | return PTR_ERR(drm_class); | |
e8b962b6 | 133 | |
fcc90213 | 134 | drm_class->pm = &drm_class_dev_pm_ops; |
0650fd58 | 135 | |
fcc90213 DH |
136 | err = class_create_file(drm_class, &class_attr_version.attr); |
137 | if (err) { | |
138 | class_destroy(drm_class); | |
139 | drm_class = NULL; | |
140 | return err; | |
141 | } | |
24f73c92 | 142 | |
fcc90213 DH |
143 | drm_class->devnode = drm_devnode; |
144 | return 0; | |
1da177e4 LT |
145 | } |
146 | ||
147 | /** | |
e8b962b6 | 148 | * drm_sysfs_destroy - destroys DRM class |
1da177e4 | 149 | * |
e8b962b6 | 150 | * Destroy the DRM device class. |
1da177e4 | 151 | */ |
e8b962b6 | 152 | void drm_sysfs_destroy(void) |
1da177e4 | 153 | { |
26b91ae4 | 154 | if (IS_ERR_OR_NULL(drm_class)) |
1da177e4 | 155 | return; |
0933e2d9 | 156 | class_remove_file(drm_class, &class_attr_version.attr); |
e8b962b6 | 157 | class_destroy(drm_class); |
49099c49 | 158 | drm_class = NULL; |
1da177e4 LT |
159 | } |
160 | ||
f453ba04 DA |
161 | /* |
162 | * Connector properties | |
163 | */ | |
c484f02d | 164 | static ssize_t status_store(struct device *device, |
f453ba04 | 165 | struct device_attribute *attr, |
c484f02d | 166 | const char *buf, size_t count) |
f453ba04 DA |
167 | { |
168 | struct drm_connector *connector = to_drm_connector(device); | |
c484f02d | 169 | struct drm_device *dev = connector->dev; |
ed293f77 | 170 | enum drm_connector_force old_force; |
007c80a5 CW |
171 | int ret; |
172 | ||
c484f02d | 173 | ret = mutex_lock_interruptible(&dev->mode_config.mutex); |
007c80a5 CW |
174 | if (ret) |
175 | return ret; | |
f453ba04 | 176 | |
ed293f77 | 177 | old_force = connector->force; |
c484f02d | 178 | |
ed293f77 | 179 | if (sysfs_streq(buf, "detect")) |
c484f02d | 180 | connector->force = 0; |
ed293f77 | 181 | else if (sysfs_streq(buf, "on")) |
c484f02d | 182 | connector->force = DRM_FORCE_ON; |
ed293f77 | 183 | else if (sysfs_streq(buf, "on-digital")) |
c484f02d | 184 | connector->force = DRM_FORCE_ON_DIGITAL; |
ed293f77 | 185 | else if (sysfs_streq(buf, "off")) |
c484f02d | 186 | connector->force = DRM_FORCE_OFF; |
ed293f77 | 187 | else |
c484f02d CW |
188 | ret = -EINVAL; |
189 | ||
ed293f77 DV |
190 | if (old_force != connector->force || !connector->force) { |
191 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n", | |
c484f02d CW |
192 | connector->base.id, |
193 | connector->name, | |
ed293f77 | 194 | old_force, connector->force); |
c484f02d | 195 | |
ed293f77 DV |
196 | connector->funcs->fill_modes(connector, |
197 | dev->mode_config.max_width, | |
198 | dev->mode_config.max_height); | |
c484f02d CW |
199 | } |
200 | ||
201 | mutex_unlock(&dev->mode_config.mutex); | |
202 | ||
38d8571d | 203 | return ret ? ret : count; |
c484f02d CW |
204 | } |
205 | ||
206 | static ssize_t status_show(struct device *device, | |
207 | struct device_attribute *attr, | |
208 | char *buf) | |
209 | { | |
210 | struct drm_connector *connector = to_drm_connector(device); | |
4eb9b945 DV |
211 | enum drm_connector_status status; |
212 | ||
213 | status = READ_ONCE(connector->status); | |
007c80a5 | 214 | |
75185c92 | 215 | return snprintf(buf, PAGE_SIZE, "%s\n", |
4eb9b945 | 216 | drm_get_connector_status_name(status)); |
f453ba04 DA |
217 | } |
218 | ||
219 | static ssize_t dpms_show(struct device *device, | |
220 | struct device_attribute *attr, | |
221 | char *buf) | |
222 | { | |
223 | struct drm_connector *connector = to_drm_connector(device); | |
621bd0f6 | 224 | int dpms; |
f453ba04 | 225 | |
621bd0f6 | 226 | dpms = READ_ONCE(connector->dpms); |
f453ba04 | 227 | |
75185c92 | 228 | return snprintf(buf, PAGE_SIZE, "%s\n", |
621bd0f6 | 229 | drm_get_dpms_name(dpms)); |
f453ba04 DA |
230 | } |
231 | ||
232 | static ssize_t enabled_show(struct device *device, | |
233 | struct device_attribute *attr, | |
234 | char *buf) | |
235 | { | |
236 | struct drm_connector *connector = to_drm_connector(device); | |
4eb9b945 DV |
237 | bool enabled; |
238 | ||
239 | enabled = READ_ONCE(connector->encoder); | |
f453ba04 | 240 | |
4eb9b945 | 241 | return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n"); |
f453ba04 DA |
242 | } |
243 | ||
2c3c8bea CW |
244 | static ssize_t edid_show(struct file *filp, struct kobject *kobj, |
245 | struct bin_attribute *attr, char *buf, loff_t off, | |
246 | size_t count) | |
f453ba04 | 247 | { |
d122cbf1 | 248 | struct device *connector_dev = kobj_to_dev(kobj); |
f453ba04 DA |
249 | struct drm_connector *connector = to_drm_connector(connector_dev); |
250 | unsigned char *edid; | |
251 | size_t size; | |
a48a62bc | 252 | ssize_t ret = 0; |
f453ba04 | 253 | |
a48a62bc | 254 | mutex_lock(&connector->dev->mode_config.mutex); |
f453ba04 | 255 | if (!connector->edid_blob_ptr) |
a48a62bc | 256 | goto unlock; |
f453ba04 DA |
257 | |
258 | edid = connector->edid_blob_ptr->data; | |
259 | size = connector->edid_blob_ptr->length; | |
260 | if (!edid) | |
a48a62bc | 261 | goto unlock; |
f453ba04 DA |
262 | |
263 | if (off >= size) | |
a48a62bc | 264 | goto unlock; |
f453ba04 DA |
265 | |
266 | if (off + count > size) | |
267 | count = size - off; | |
268 | memcpy(buf, edid + off, count); | |
269 | ||
a48a62bc DV |
270 | ret = count; |
271 | unlock: | |
272 | mutex_unlock(&connector->dev->mode_config.mutex); | |
273 | ||
274 | return ret; | |
f453ba04 DA |
275 | } |
276 | ||
277 | static ssize_t modes_show(struct device *device, | |
278 | struct device_attribute *attr, | |
279 | char *buf) | |
280 | { | |
281 | struct drm_connector *connector = to_drm_connector(device); | |
282 | struct drm_display_mode *mode; | |
283 | int written = 0; | |
284 | ||
a48a62bc | 285 | mutex_lock(&connector->dev->mode_config.mutex); |
f453ba04 DA |
286 | list_for_each_entry(mode, &connector->modes, head) { |
287 | written += snprintf(buf + written, PAGE_SIZE - written, "%s\n", | |
288 | mode->name); | |
289 | } | |
a48a62bc | 290 | mutex_unlock(&connector->dev->mode_config.mutex); |
f453ba04 DA |
291 | |
292 | return written; | |
293 | } | |
294 | ||
c484f02d | 295 | static DEVICE_ATTR_RW(status); |
335f1a62 TI |
296 | static DEVICE_ATTR_RO(enabled); |
297 | static DEVICE_ATTR_RO(dpms); | |
298 | static DEVICE_ATTR_RO(modes); | |
299 | ||
300 | static struct attribute *connector_dev_attrs[] = { | |
301 | &dev_attr_status.attr, | |
302 | &dev_attr_enabled.attr, | |
303 | &dev_attr_dpms.attr, | |
304 | &dev_attr_modes.attr, | |
305 | NULL | |
f453ba04 DA |
306 | }; |
307 | ||
f453ba04 DA |
308 | static struct bin_attribute edid_attr = { |
309 | .attr.name = "edid", | |
e36ebaf4 | 310 | .attr.mode = 0444, |
7466f4cc | 311 | .size = 0, |
f453ba04 DA |
312 | .read = edid_show, |
313 | }; | |
314 | ||
335f1a62 TI |
315 | static struct bin_attribute *connector_bin_attrs[] = { |
316 | &edid_attr, | |
317 | NULL | |
318 | }; | |
319 | ||
320 | static const struct attribute_group connector_dev_group = { | |
321 | .attrs = connector_dev_attrs, | |
322 | .bin_attrs = connector_bin_attrs, | |
323 | }; | |
324 | ||
335f1a62 TI |
325 | static const struct attribute_group *connector_dev_groups[] = { |
326 | &connector_dev_group, | |
335f1a62 TI |
327 | NULL |
328 | }; | |
329 | ||
f453ba04 | 330 | /** |
3b02ab88 | 331 | * drm_sysfs_connector_add - add a connector to sysfs |
f453ba04 DA |
332 | * @connector: connector to add |
333 | * | |
3b02ab88 | 334 | * Create a connector device in sysfs, along with its associated connector |
f453ba04 DA |
335 | * properties (so far, connection status, dpms, mode list & edid) and |
336 | * generate a hotplug event so userspace knows there's a new connector | |
337 | * available. | |
f453ba04 DA |
338 | */ |
339 | int drm_sysfs_connector_add(struct drm_connector *connector) | |
340 | { | |
341 | struct drm_device *dev = connector->dev; | |
f453ba04 | 342 | |
5bdebb18 DA |
343 | if (connector->kdev) |
344 | return 0; | |
f453ba04 | 345 | |
335f1a62 TI |
346 | connector->kdev = |
347 | device_create_with_groups(drm_class, dev->primary->kdev, 0, | |
348 | connector, connector_dev_groups, | |
349 | "card%d-%s", dev->primary->index, | |
350 | connector->name); | |
f453ba04 | 351 | DRM_DEBUG("adding \"%s\" to sysfs\n", |
25933820 | 352 | connector->name); |
f453ba04 | 353 | |
5bdebb18 DA |
354 | if (IS_ERR(connector->kdev)) { |
355 | DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev)); | |
335f1a62 | 356 | return PTR_ERR(connector->kdev); |
f453ba04 DA |
357 | } |
358 | ||
f453ba04 DA |
359 | /* Let userspace know we have a new connector */ |
360 | drm_sysfs_hotplug_event(dev); | |
361 | ||
362 | return 0; | |
f453ba04 | 363 | } |
f453ba04 DA |
364 | |
365 | /** | |
366 | * drm_sysfs_connector_remove - remove an connector device from sysfs | |
367 | * @connector: connector to remove | |
368 | * | |
369 | * Remove @connector and its associated attributes from sysfs. Note that | |
370 | * the device model core will take care of sending the "remove" uevent | |
371 | * at this time, so we don't need to do it. | |
372 | * | |
373 | * Note: | |
374 | * This routine should only be called if the connector was previously | |
375 | * successfully registered. If @connector hasn't been registered yet, | |
376 | * you'll likely see a panic somewhere deep in sysfs code when called. | |
377 | */ | |
378 | void drm_sysfs_connector_remove(struct drm_connector *connector) | |
379 | { | |
5bdebb18 | 380 | if (!connector->kdev) |
1828fe6c | 381 | return; |
f453ba04 | 382 | DRM_DEBUG("removing \"%s\" from sysfs\n", |
25933820 | 383 | connector->name); |
f453ba04 | 384 | |
5bdebb18 DA |
385 | device_unregister(connector->kdev); |
386 | connector->kdev = NULL; | |
f453ba04 | 387 | } |
f453ba04 DA |
388 | |
389 | /** | |
390 | * drm_sysfs_hotplug_event - generate a DRM uevent | |
391 | * @dev: DRM device | |
392 | * | |
393 | * Send a uevent for the DRM device specified by @dev. Currently we only | |
394 | * set HOTPLUG=1 in the uevent environment, but this could be expanded to | |
395 | * deal with other types of events. | |
396 | */ | |
397 | void drm_sysfs_hotplug_event(struct drm_device *dev) | |
398 | { | |
399 | char *event_string = "HOTPLUG=1"; | |
400 | char *envp[] = { event_string, NULL }; | |
401 | ||
402 | DRM_DEBUG("generating hotplug event\n"); | |
403 | ||
5bdebb18 | 404 | kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp); |
f453ba04 | 405 | } |
5ca58282 | 406 | EXPORT_SYMBOL(drm_sysfs_hotplug_event); |
f453ba04 | 407 | |
760c960b DH |
408 | static void drm_sysfs_release(struct device *dev) |
409 | { | |
410 | kfree(dev); | |
411 | } | |
412 | ||
1da177e4 | 413 | /** |
e1728075 DH |
414 | * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor |
415 | * @minor: minor to allocate sysfs device for | |
1da177e4 | 416 | * |
e1728075 DH |
417 | * This allocates a new sysfs device for @minor and returns it. The device is |
418 | * not registered nor linked. The caller has to use device_add() and | |
419 | * device_del() to register and unregister it. | |
420 | * | |
421 | * Note that dev_get_drvdata() on the new device will return the minor. | |
422 | * However, the device does not hold a ref-count to the minor nor to the | |
423 | * underlying drm_device. This is unproblematic as long as you access the | |
424 | * private data only in sysfs callbacks. device_del() disables those | |
425 | * synchronously, so they cannot be called after you cleanup a minor. | |
1da177e4 | 426 | */ |
e1728075 | 427 | struct device *drm_sysfs_minor_alloc(struct drm_minor *minor) |
1da177e4 | 428 | { |
e1728075 DH |
429 | const char *minor_str; |
430 | struct device *kdev; | |
760c960b | 431 | int r; |
e8b962b6 | 432 | |
f453ba04 DA |
433 | if (minor->type == DRM_MINOR_CONTROL) |
434 | minor_str = "controlD%d"; | |
e1728075 DH |
435 | else if (minor->type == DRM_MINOR_RENDER) |
436 | minor_str = "renderD%d"; | |
437 | else | |
438 | minor_str = "card%d"; | |
439 | ||
440 | kdev = kzalloc(sizeof(*kdev), GFP_KERNEL); | |
441 | if (!kdev) | |
442 | return ERR_PTR(-ENOMEM); | |
443 | ||
444 | device_initialize(kdev); | |
445 | kdev->devt = MKDEV(DRM_MAJOR, minor->index); | |
446 | kdev->class = drm_class; | |
447 | kdev->type = &drm_sysfs_device_minor; | |
448 | kdev->parent = minor->dev->dev; | |
449 | kdev->release = drm_sysfs_release; | |
450 | dev_set_drvdata(kdev, minor); | |
451 | ||
452 | r = dev_set_name(kdev, minor_str, minor->index); | |
760c960b | 453 | if (r < 0) |
e1728075 | 454 | goto err_free; |
760c960b | 455 | |
e1728075 | 456 | return kdev; |
1da177e4 | 457 | |
e1728075 DH |
458 | err_free: |
459 | put_device(kdev); | |
460 | return ERR_PTR(r); | |
1da177e4 | 461 | } |
327c225b | 462 | |
327c225b TH |
463 | /** |
464 | * drm_class_device_register - Register a struct device in the drm class. | |
465 | * | |
466 | * @dev: pointer to struct device to register. | |
467 | * | |
468 | * @dev should have all relevant members pre-filled with the exception | |
469 | * of the class member. In particular, the device_type member must | |
470 | * be set. | |
471 | */ | |
472 | ||
473 | int drm_class_device_register(struct device *dev) | |
474 | { | |
49099c49 DA |
475 | if (!drm_class || IS_ERR(drm_class)) |
476 | return -ENOENT; | |
477 | ||
327c225b TH |
478 | dev->class = drm_class; |
479 | return device_register(dev); | |
480 | } | |
481 | EXPORT_SYMBOL_GPL(drm_class_device_register); | |
482 | ||
483 | void drm_class_device_unregister(struct device *dev) | |
484 | { | |
485 | return device_unregister(dev); | |
486 | } | |
487 | EXPORT_SYMBOL_GPL(drm_class_device_unregister); |