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