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 | 21 | #include <drm/drm_sysfs.h> |
760285e7 | 22 | #include <drm/drmP.h> |
67d0ec4e | 23 | #include "drm_internal.h" |
1da177e4 | 24 | |
5bdebb18 DA |
25 | #define to_drm_minor(d) dev_get_drvdata(d) |
26 | #define to_drm_connector(d) dev_get_drvdata(d) | |
e8b962b6 | 27 | |
e2271704 DV |
28 | /** |
29 | * DOC: overview | |
30 | * | |
31 | * DRM provides very little additional support to drivers for sysfs | |
32 | * interactions, beyond just all the standard stuff. Drivers who want to expose | |
33 | * additional sysfs properties and property groups can attach them at either | |
34 | * &drm_device.dev or &drm_connector.kdev. | |
35 | * | |
36 | * Registration is automatically handled when calling drm_dev_register(), or | |
37 | * drm_connector_register() in case of hot-plugged connectors. Unregistration is | |
38 | * also automatically handled by drm_dev_unregister() and | |
39 | * drm_connector_unregister(). | |
40 | */ | |
41 | ||
08e4d534 TH |
42 | static struct device_type drm_sysfs_device_minor = { |
43 | .name = "drm_minor" | |
44 | }; | |
45 | ||
fcc90213 DH |
46 | struct class *drm_class; |
47 | ||
2c9ede55 | 48 | static char *drm_devnode(struct device *dev, umode_t *mode) |
02200d06 KS |
49 | { |
50 | return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev)); | |
51 | } | |
52 | ||
82d5e73f | 53 | static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810"); |
1da177e4 LT |
54 | |
55 | /** | |
fcc90213 DH |
56 | * drm_sysfs_init - initialize sysfs helpers |
57 | * | |
58 | * This is used to create the DRM class, which is the implicit parent of any | |
59 | * other top-level DRM sysfs objects. | |
1da177e4 | 60 | * |
fcc90213 | 61 | * You must call drm_sysfs_destroy() to release the allocated resources. |
1da177e4 | 62 | * |
fcc90213 | 63 | * Return: 0 on success, negative error code on failure. |
1da177e4 | 64 | */ |
fcc90213 | 65 | int drm_sysfs_init(void) |
1da177e4 | 66 | { |
24f73c92 | 67 | int err; |
0650fd58 | 68 | |
fcc90213 DH |
69 | drm_class = class_create(THIS_MODULE, "drm"); |
70 | if (IS_ERR(drm_class)) | |
71 | return PTR_ERR(drm_class); | |
e8b962b6 | 72 | |
fcc90213 DH |
73 | err = class_create_file(drm_class, &class_attr_version.attr); |
74 | if (err) { | |
75 | class_destroy(drm_class); | |
76 | drm_class = NULL; | |
77 | return err; | |
78 | } | |
24f73c92 | 79 | |
fcc90213 DH |
80 | drm_class->devnode = drm_devnode; |
81 | return 0; | |
1da177e4 LT |
82 | } |
83 | ||
84 | /** | |
e8b962b6 | 85 | * drm_sysfs_destroy - destroys DRM class |
1da177e4 | 86 | * |
e8b962b6 | 87 | * Destroy the DRM device class. |
1da177e4 | 88 | */ |
e8b962b6 | 89 | void drm_sysfs_destroy(void) |
1da177e4 | 90 | { |
26b91ae4 | 91 | if (IS_ERR_OR_NULL(drm_class)) |
1da177e4 | 92 | return; |
0933e2d9 | 93 | class_remove_file(drm_class, &class_attr_version.attr); |
e8b962b6 | 94 | class_destroy(drm_class); |
49099c49 | 95 | drm_class = NULL; |
1da177e4 LT |
96 | } |
97 | ||
f453ba04 DA |
98 | /* |
99 | * Connector properties | |
100 | */ | |
c484f02d | 101 | static ssize_t status_store(struct device *device, |
f453ba04 | 102 | struct device_attribute *attr, |
c484f02d | 103 | const char *buf, size_t count) |
f453ba04 DA |
104 | { |
105 | struct drm_connector *connector = to_drm_connector(device); | |
c484f02d | 106 | struct drm_device *dev = connector->dev; |
ed293f77 | 107 | enum drm_connector_force old_force; |
007c80a5 CW |
108 | int ret; |
109 | ||
c484f02d | 110 | ret = mutex_lock_interruptible(&dev->mode_config.mutex); |
007c80a5 CW |
111 | if (ret) |
112 | return ret; | |
f453ba04 | 113 | |
ed293f77 | 114 | old_force = connector->force; |
c484f02d | 115 | |
ed293f77 | 116 | if (sysfs_streq(buf, "detect")) |
c484f02d | 117 | connector->force = 0; |
ed293f77 | 118 | else if (sysfs_streq(buf, "on")) |
c484f02d | 119 | connector->force = DRM_FORCE_ON; |
ed293f77 | 120 | else if (sysfs_streq(buf, "on-digital")) |
c484f02d | 121 | connector->force = DRM_FORCE_ON_DIGITAL; |
ed293f77 | 122 | else if (sysfs_streq(buf, "off")) |
c484f02d | 123 | connector->force = DRM_FORCE_OFF; |
ed293f77 | 124 | else |
c484f02d CW |
125 | ret = -EINVAL; |
126 | ||
ed293f77 DV |
127 | if (old_force != connector->force || !connector->force) { |
128 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n", | |
c484f02d CW |
129 | connector->base.id, |
130 | connector->name, | |
ed293f77 | 131 | old_force, connector->force); |
c484f02d | 132 | |
ed293f77 DV |
133 | connector->funcs->fill_modes(connector, |
134 | dev->mode_config.max_width, | |
135 | dev->mode_config.max_height); | |
c484f02d CW |
136 | } |
137 | ||
138 | mutex_unlock(&dev->mode_config.mutex); | |
139 | ||
38d8571d | 140 | return ret ? ret : count; |
c484f02d CW |
141 | } |
142 | ||
143 | static ssize_t status_show(struct device *device, | |
144 | struct device_attribute *attr, | |
145 | char *buf) | |
146 | { | |
147 | struct drm_connector *connector = to_drm_connector(device); | |
4eb9b945 DV |
148 | enum drm_connector_status status; |
149 | ||
150 | status = READ_ONCE(connector->status); | |
007c80a5 | 151 | |
75185c92 | 152 | return snprintf(buf, PAGE_SIZE, "%s\n", |
4eb9b945 | 153 | drm_get_connector_status_name(status)); |
f453ba04 DA |
154 | } |
155 | ||
156 | static ssize_t dpms_show(struct device *device, | |
157 | struct device_attribute *attr, | |
158 | char *buf) | |
159 | { | |
160 | struct drm_connector *connector = to_drm_connector(device); | |
621bd0f6 | 161 | int dpms; |
f453ba04 | 162 | |
621bd0f6 | 163 | dpms = READ_ONCE(connector->dpms); |
f453ba04 | 164 | |
75185c92 | 165 | return snprintf(buf, PAGE_SIZE, "%s\n", |
621bd0f6 | 166 | drm_get_dpms_name(dpms)); |
f453ba04 DA |
167 | } |
168 | ||
169 | static ssize_t enabled_show(struct device *device, | |
170 | struct device_attribute *attr, | |
171 | char *buf) | |
172 | { | |
173 | struct drm_connector *connector = to_drm_connector(device); | |
4eb9b945 DV |
174 | bool enabled; |
175 | ||
176 | enabled = READ_ONCE(connector->encoder); | |
f453ba04 | 177 | |
4eb9b945 | 178 | return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n"); |
f453ba04 DA |
179 | } |
180 | ||
2c3c8bea CW |
181 | static ssize_t edid_show(struct file *filp, struct kobject *kobj, |
182 | struct bin_attribute *attr, char *buf, loff_t off, | |
183 | size_t count) | |
f453ba04 | 184 | { |
d122cbf1 | 185 | struct device *connector_dev = kobj_to_dev(kobj); |
f453ba04 DA |
186 | struct drm_connector *connector = to_drm_connector(connector_dev); |
187 | unsigned char *edid; | |
188 | size_t size; | |
a48a62bc | 189 | ssize_t ret = 0; |
f453ba04 | 190 | |
a48a62bc | 191 | mutex_lock(&connector->dev->mode_config.mutex); |
f453ba04 | 192 | if (!connector->edid_blob_ptr) |
a48a62bc | 193 | goto unlock; |
f453ba04 DA |
194 | |
195 | edid = connector->edid_blob_ptr->data; | |
196 | size = connector->edid_blob_ptr->length; | |
197 | if (!edid) | |
a48a62bc | 198 | goto unlock; |
f453ba04 DA |
199 | |
200 | if (off >= size) | |
a48a62bc | 201 | goto unlock; |
f453ba04 DA |
202 | |
203 | if (off + count > size) | |
204 | count = size - off; | |
205 | memcpy(buf, edid + off, count); | |
206 | ||
a48a62bc DV |
207 | ret = count; |
208 | unlock: | |
209 | mutex_unlock(&connector->dev->mode_config.mutex); | |
210 | ||
211 | return ret; | |
f453ba04 DA |
212 | } |
213 | ||
214 | static ssize_t modes_show(struct device *device, | |
215 | struct device_attribute *attr, | |
216 | char *buf) | |
217 | { | |
218 | struct drm_connector *connector = to_drm_connector(device); | |
219 | struct drm_display_mode *mode; | |
220 | int written = 0; | |
221 | ||
a48a62bc | 222 | mutex_lock(&connector->dev->mode_config.mutex); |
f453ba04 DA |
223 | list_for_each_entry(mode, &connector->modes, head) { |
224 | written += snprintf(buf + written, PAGE_SIZE - written, "%s\n", | |
225 | mode->name); | |
226 | } | |
a48a62bc | 227 | mutex_unlock(&connector->dev->mode_config.mutex); |
f453ba04 DA |
228 | |
229 | return written; | |
230 | } | |
231 | ||
c484f02d | 232 | static DEVICE_ATTR_RW(status); |
335f1a62 TI |
233 | static DEVICE_ATTR_RO(enabled); |
234 | static DEVICE_ATTR_RO(dpms); | |
235 | static DEVICE_ATTR_RO(modes); | |
236 | ||
237 | static struct attribute *connector_dev_attrs[] = { | |
238 | &dev_attr_status.attr, | |
239 | &dev_attr_enabled.attr, | |
240 | &dev_attr_dpms.attr, | |
241 | &dev_attr_modes.attr, | |
242 | NULL | |
f453ba04 DA |
243 | }; |
244 | ||
f453ba04 DA |
245 | static struct bin_attribute edid_attr = { |
246 | .attr.name = "edid", | |
e36ebaf4 | 247 | .attr.mode = 0444, |
7466f4cc | 248 | .size = 0, |
f453ba04 DA |
249 | .read = edid_show, |
250 | }; | |
251 | ||
335f1a62 TI |
252 | static struct bin_attribute *connector_bin_attrs[] = { |
253 | &edid_attr, | |
254 | NULL | |
255 | }; | |
256 | ||
257 | static const struct attribute_group connector_dev_group = { | |
258 | .attrs = connector_dev_attrs, | |
259 | .bin_attrs = connector_bin_attrs, | |
260 | }; | |
261 | ||
335f1a62 TI |
262 | static const struct attribute_group *connector_dev_groups[] = { |
263 | &connector_dev_group, | |
335f1a62 TI |
264 | NULL |
265 | }; | |
266 | ||
f453ba04 DA |
267 | int drm_sysfs_connector_add(struct drm_connector *connector) |
268 | { | |
269 | struct drm_device *dev = connector->dev; | |
f453ba04 | 270 | |
5bdebb18 DA |
271 | if (connector->kdev) |
272 | return 0; | |
f453ba04 | 273 | |
335f1a62 TI |
274 | connector->kdev = |
275 | device_create_with_groups(drm_class, dev->primary->kdev, 0, | |
276 | connector, connector_dev_groups, | |
277 | "card%d-%s", dev->primary->index, | |
278 | connector->name); | |
f453ba04 | 279 | DRM_DEBUG("adding \"%s\" to sysfs\n", |
25933820 | 280 | connector->name); |
f453ba04 | 281 | |
5bdebb18 DA |
282 | if (IS_ERR(connector->kdev)) { |
283 | DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev)); | |
335f1a62 | 284 | return PTR_ERR(connector->kdev); |
f453ba04 DA |
285 | } |
286 | ||
f453ba04 DA |
287 | /* Let userspace know we have a new connector */ |
288 | drm_sysfs_hotplug_event(dev); | |
289 | ||
290 | return 0; | |
f453ba04 | 291 | } |
f453ba04 | 292 | |
f453ba04 DA |
293 | void drm_sysfs_connector_remove(struct drm_connector *connector) |
294 | { | |
5bdebb18 | 295 | if (!connector->kdev) |
1828fe6c | 296 | return; |
f453ba04 | 297 | DRM_DEBUG("removing \"%s\" from sysfs\n", |
25933820 | 298 | connector->name); |
f453ba04 | 299 | |
5bdebb18 DA |
300 | device_unregister(connector->kdev); |
301 | connector->kdev = NULL; | |
f453ba04 | 302 | } |
f453ba04 DA |
303 | |
304 | /** | |
305 | * drm_sysfs_hotplug_event - generate a DRM uevent | |
306 | * @dev: DRM device | |
307 | * | |
308 | * Send a uevent for the DRM device specified by @dev. Currently we only | |
309 | * set HOTPLUG=1 in the uevent environment, but this could be expanded to | |
310 | * deal with other types of events. | |
311 | */ | |
312 | void drm_sysfs_hotplug_event(struct drm_device *dev) | |
313 | { | |
314 | char *event_string = "HOTPLUG=1"; | |
315 | char *envp[] = { event_string, NULL }; | |
316 | ||
317 | DRM_DEBUG("generating hotplug event\n"); | |
318 | ||
5bdebb18 | 319 | kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp); |
f453ba04 | 320 | } |
5ca58282 | 321 | EXPORT_SYMBOL(drm_sysfs_hotplug_event); |
f453ba04 | 322 | |
760c960b DH |
323 | static void drm_sysfs_release(struct device *dev) |
324 | { | |
325 | kfree(dev); | |
326 | } | |
327 | ||
e1728075 | 328 | struct device *drm_sysfs_minor_alloc(struct drm_minor *minor) |
1da177e4 | 329 | { |
e1728075 DH |
330 | const char *minor_str; |
331 | struct device *kdev; | |
760c960b | 332 | int r; |
e8b962b6 | 333 | |
f453ba04 DA |
334 | if (minor->type == DRM_MINOR_CONTROL) |
335 | minor_str = "controlD%d"; | |
e1728075 DH |
336 | else if (minor->type == DRM_MINOR_RENDER) |
337 | minor_str = "renderD%d"; | |
338 | else | |
339 | minor_str = "card%d"; | |
340 | ||
341 | kdev = kzalloc(sizeof(*kdev), GFP_KERNEL); | |
342 | if (!kdev) | |
343 | return ERR_PTR(-ENOMEM); | |
344 | ||
345 | device_initialize(kdev); | |
346 | kdev->devt = MKDEV(DRM_MAJOR, minor->index); | |
347 | kdev->class = drm_class; | |
348 | kdev->type = &drm_sysfs_device_minor; | |
349 | kdev->parent = minor->dev->dev; | |
350 | kdev->release = drm_sysfs_release; | |
351 | dev_set_drvdata(kdev, minor); | |
352 | ||
353 | r = dev_set_name(kdev, minor_str, minor->index); | |
760c960b | 354 | if (r < 0) |
e1728075 | 355 | goto err_free; |
760c960b | 356 | |
e1728075 | 357 | return kdev; |
1da177e4 | 358 | |
e1728075 DH |
359 | err_free: |
360 | put_device(kdev); | |
361 | return ERR_PTR(r); | |
1da177e4 | 362 | } |
327c225b | 363 | |
327c225b | 364 | /** |
e2271704 DV |
365 | * drm_class_device_register - register new device with the DRM sysfs class |
366 | * @dev: device to register | |
327c225b | 367 | * |
e2271704 DV |
368 | * Registers a new &struct device within the DRM sysfs class. Essentially only |
369 | * used by ttm to have a place for its global settings. Drivers should never use | |
370 | * this. | |
327c225b | 371 | */ |
327c225b TH |
372 | int drm_class_device_register(struct device *dev) |
373 | { | |
49099c49 DA |
374 | if (!drm_class || IS_ERR(drm_class)) |
375 | return -ENOENT; | |
376 | ||
327c225b TH |
377 | dev->class = drm_class; |
378 | return device_register(dev); | |
379 | } | |
380 | EXPORT_SYMBOL_GPL(drm_class_device_register); | |
381 | ||
e2271704 DV |
382 | /** |
383 | * drm_class_device_unregister - unregister device with the DRM sysfs class | |
384 | * @dev: device to unregister | |
385 | * | |
386 | * Unregisters a &struct device from the DRM sysfs class. Essentially only used | |
387 | * by ttm to have a place for its global settings. Drivers should never use | |
388 | * this. | |
389 | */ | |
327c225b TH |
390 | void drm_class_device_unregister(struct device *dev) |
391 | { | |
392 | return device_unregister(dev); | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(drm_class_device_unregister); |