1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * V4L2 sub-device
4 *
5 * Copyright (C) 2010 Nokia Corporation
6 *
7 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
8 * Sakari Ailus <sakari.ailus@iki.fi>
9 */
10
11 #include <linux/ioctl.h>
12 #include <linux/mm.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/types.h>
16 #include <linux/videodev2.h>
17 #include <linux/export.h>
18 #include <linux/version.h>
19
20 #include <media/v4l2-ctrls.h>
21 #include <media/v4l2-device.h>
22 #include <media/v4l2-ioctl.h>
23 #include <media/v4l2-fh.h>
24 #include <media/v4l2-event.h>
25
26 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
subdev_fh_init(struct v4l2_subdev_fh * fh,struct v4l2_subdev * sd)27 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
28 {
29 struct v4l2_subdev_state *state;
30 static struct lock_class_key key;
31
32 state = __v4l2_subdev_state_alloc(sd, "fh->state->lock", &key);
33 if (IS_ERR(state))
34 return PTR_ERR(state);
35
36 fh->state = state;
37
38 return 0;
39 }
40
subdev_fh_free(struct v4l2_subdev_fh * fh)41 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
42 {
43 __v4l2_subdev_state_free(fh->state);
44 fh->state = NULL;
45 }
46
subdev_open(struct file * file)47 static int subdev_open(struct file *file)
48 {
49 struct video_device *vdev = video_devdata(file);
50 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
51 struct v4l2_subdev_fh *subdev_fh;
52 int ret;
53
54 subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
55 if (subdev_fh == NULL)
56 return -ENOMEM;
57
58 ret = subdev_fh_init(subdev_fh, sd);
59 if (ret) {
60 kfree(subdev_fh);
61 return ret;
62 }
63
64 v4l2_fh_init(&subdev_fh->vfh, vdev);
65 v4l2_fh_add(&subdev_fh->vfh);
66 file->private_data = &subdev_fh->vfh;
67
68 if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
69 struct module *owner;
70
71 owner = sd->entity.graph_obj.mdev->dev->driver->owner;
72 if (!try_module_get(owner)) {
73 ret = -EBUSY;
74 goto err;
75 }
76 subdev_fh->owner = owner;
77 }
78
79 if (sd->internal_ops && sd->internal_ops->open) {
80 ret = sd->internal_ops->open(sd, subdev_fh);
81 if (ret < 0)
82 goto err;
83 }
84
85 return 0;
86
87 err:
88 module_put(subdev_fh->owner);
89 v4l2_fh_del(&subdev_fh->vfh);
90 v4l2_fh_exit(&subdev_fh->vfh);
91 subdev_fh_free(subdev_fh);
92 kfree(subdev_fh);
93
94 return ret;
95 }
96
subdev_close(struct file * file)97 static int subdev_close(struct file *file)
98 {
99 struct video_device *vdev = video_devdata(file);
100 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
101 struct v4l2_fh *vfh = file->private_data;
102 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
103
104 if (sd->internal_ops && sd->internal_ops->close)
105 sd->internal_ops->close(sd, subdev_fh);
106 module_put(subdev_fh->owner);
107 v4l2_fh_del(vfh);
108 v4l2_fh_exit(vfh);
109 subdev_fh_free(subdev_fh);
110 kfree(subdev_fh);
111 file->private_data = NULL;
112
113 return 0;
114 }
115 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
subdev_open(struct file * file)116 static int subdev_open(struct file *file)
117 {
118 return -ENODEV;
119 }
120
subdev_close(struct file * file)121 static int subdev_close(struct file *file)
122 {
123 return -ENODEV;
124 }
125 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
126
check_which(u32 which)127 static inline int check_which(u32 which)
128 {
129 if (which != V4L2_SUBDEV_FORMAT_TRY &&
130 which != V4L2_SUBDEV_FORMAT_ACTIVE)
131 return -EINVAL;
132
133 return 0;
134 }
135
check_pad(struct v4l2_subdev * sd,u32 pad)136 static inline int check_pad(struct v4l2_subdev *sd, u32 pad)
137 {
138 #if defined(CONFIG_MEDIA_CONTROLLER)
139 if (sd->entity.num_pads) {
140 if (pad >= sd->entity.num_pads)
141 return -EINVAL;
142 return 0;
143 }
144 #endif
145 /* allow pad 0 on subdevices not registered as media entities */
146 if (pad > 0)
147 return -EINVAL;
148 return 0;
149 }
150
check_state_pads(u32 which,struct v4l2_subdev_state * state)151 static int check_state_pads(u32 which, struct v4l2_subdev_state *state)
152 {
153 if (which == V4L2_SUBDEV_FORMAT_TRY && (!state || !state->pads))
154 return -EINVAL;
155
156 return 0;
157 }
158
check_format(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_format * format)159 static inline int check_format(struct v4l2_subdev *sd,
160 struct v4l2_subdev_state *state,
161 struct v4l2_subdev_format *format)
162 {
163 if (!format)
164 return -EINVAL;
165
166 return check_which(format->which) ? : check_pad(sd, format->pad) ? :
167 check_state_pads(format->which, state);
168 }
169
call_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_format * format)170 static int call_get_fmt(struct v4l2_subdev *sd,
171 struct v4l2_subdev_state *state,
172 struct v4l2_subdev_format *format)
173 {
174 return check_format(sd, state, format) ? :
175 sd->ops->pad->get_fmt(sd, state, format);
176 }
177
call_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_format * format)178 static int call_set_fmt(struct v4l2_subdev *sd,
179 struct v4l2_subdev_state *state,
180 struct v4l2_subdev_format *format)
181 {
182 return check_format(sd, state, format) ? :
183 sd->ops->pad->set_fmt(sd, state, format);
184 }
185
call_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_mbus_code_enum * code)186 static int call_enum_mbus_code(struct v4l2_subdev *sd,
187 struct v4l2_subdev_state *state,
188 struct v4l2_subdev_mbus_code_enum *code)
189 {
190 if (!code)
191 return -EINVAL;
192
193 return check_which(code->which) ? : check_pad(sd, code->pad) ? :
194 check_state_pads(code->which, state) ? :
195 sd->ops->pad->enum_mbus_code(sd, state, code);
196 }
197
call_enum_frame_size(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_frame_size_enum * fse)198 static int call_enum_frame_size(struct v4l2_subdev *sd,
199 struct v4l2_subdev_state *state,
200 struct v4l2_subdev_frame_size_enum *fse)
201 {
202 if (!fse)
203 return -EINVAL;
204
205 return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
206 check_state_pads(fse->which, state) ? :
207 sd->ops->pad->enum_frame_size(sd, state, fse);
208 }
209
check_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)210 static inline int check_frame_interval(struct v4l2_subdev *sd,
211 struct v4l2_subdev_frame_interval *fi)
212 {
213 if (!fi)
214 return -EINVAL;
215
216 return check_pad(sd, fi->pad);
217 }
218
call_g_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)219 static int call_g_frame_interval(struct v4l2_subdev *sd,
220 struct v4l2_subdev_frame_interval *fi)
221 {
222 return check_frame_interval(sd, fi) ? :
223 sd->ops->video->g_frame_interval(sd, fi);
224 }
225
call_s_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_frame_interval * fi)226 static int call_s_frame_interval(struct v4l2_subdev *sd,
227 struct v4l2_subdev_frame_interval *fi)
228 {
229 return check_frame_interval(sd, fi) ? :
230 sd->ops->video->s_frame_interval(sd, fi);
231 }
232
call_enum_frame_interval(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_frame_interval_enum * fie)233 static int call_enum_frame_interval(struct v4l2_subdev *sd,
234 struct v4l2_subdev_state *state,
235 struct v4l2_subdev_frame_interval_enum *fie)
236 {
237 if (!fie)
238 return -EINVAL;
239
240 return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
241 check_state_pads(fie->which, state) ? :
242 sd->ops->pad->enum_frame_interval(sd, state, fie);
243 }
244
check_selection(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_selection * sel)245 static inline int check_selection(struct v4l2_subdev *sd,
246 struct v4l2_subdev_state *state,
247 struct v4l2_subdev_selection *sel)
248 {
249 if (!sel)
250 return -EINVAL;
251
252 return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
253 check_state_pads(sel->which, state);
254 }
255
call_get_selection(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_selection * sel)256 static int call_get_selection(struct v4l2_subdev *sd,
257 struct v4l2_subdev_state *state,
258 struct v4l2_subdev_selection *sel)
259 {
260 return check_selection(sd, state, sel) ? :
261 sd->ops->pad->get_selection(sd, state, sel);
262 }
263
call_set_selection(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_selection * sel)264 static int call_set_selection(struct v4l2_subdev *sd,
265 struct v4l2_subdev_state *state,
266 struct v4l2_subdev_selection *sel)
267 {
268 return check_selection(sd, state, sel) ? :
269 sd->ops->pad->set_selection(sd, state, sel);
270 }
271
check_edid(struct v4l2_subdev * sd,struct v4l2_subdev_edid * edid)272 static inline int check_edid(struct v4l2_subdev *sd,
273 struct v4l2_subdev_edid *edid)
274 {
275 if (!edid)
276 return -EINVAL;
277
278 if (edid->blocks && edid->edid == NULL)
279 return -EINVAL;
280
281 return check_pad(sd, edid->pad);
282 }
283
call_get_edid(struct v4l2_subdev * sd,struct v4l2_subdev_edid * edid)284 static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
285 {
286 return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
287 }
288
call_set_edid(struct v4l2_subdev * sd,struct v4l2_subdev_edid * edid)289 static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
290 {
291 return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
292 }
293
call_dv_timings_cap(struct v4l2_subdev * sd,struct v4l2_dv_timings_cap * cap)294 static int call_dv_timings_cap(struct v4l2_subdev *sd,
295 struct v4l2_dv_timings_cap *cap)
296 {
297 if (!cap)
298 return -EINVAL;
299
300 return check_pad(sd, cap->pad) ? :
301 sd->ops->pad->dv_timings_cap(sd, cap);
302 }
303
call_enum_dv_timings(struct v4l2_subdev * sd,struct v4l2_enum_dv_timings * dvt)304 static int call_enum_dv_timings(struct v4l2_subdev *sd,
305 struct v4l2_enum_dv_timings *dvt)
306 {
307 if (!dvt)
308 return -EINVAL;
309
310 return check_pad(sd, dvt->pad) ? :
311 sd->ops->pad->enum_dv_timings(sd, dvt);
312 }
313
call_get_mbus_config(struct v4l2_subdev * sd,unsigned int pad,struct v4l2_mbus_config * config)314 static int call_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
315 struct v4l2_mbus_config *config)
316 {
317 return check_pad(sd, pad) ? :
318 sd->ops->pad->get_mbus_config(sd, pad, config);
319 }
320
321 #ifdef CONFIG_MEDIA_CONTROLLER
322 /*
323 * Create state-management wrapper for pad ops dealing with subdev state. The
324 * wrapper handles the case where the caller does not provide the called
325 * subdev's state. This should be removed when all the callers are fixed.
326 */
327 #define DEFINE_STATE_WRAPPER(f, arg_type) \
328 static int call_##f##_state(struct v4l2_subdev *sd, \
329 struct v4l2_subdev_state *_state, \
330 arg_type *arg) \
331 { \
332 struct v4l2_subdev_state *state = _state; \
333 int ret; \
334 if (!_state) \
335 state = v4l2_subdev_lock_and_get_active_state(sd); \
336 ret = call_##f(sd, state, arg); \
337 if (!_state && state) \
338 v4l2_subdev_unlock_state(state); \
339 return ret; \
340 }
341
342 #else /* CONFIG_MEDIA_CONTROLLER */
343
344 #define DEFINE_STATE_WRAPPER(f, arg_type) \
345 static int call_##f##_state(struct v4l2_subdev *sd, \
346 struct v4l2_subdev_state *state, \
347 arg_type *arg) \
348 { \
349 return call_##f(sd, state, arg); \
350 }
351
352 #endif /* CONFIG_MEDIA_CONTROLLER */
353
354 DEFINE_STATE_WRAPPER(get_fmt, struct v4l2_subdev_format);
355 DEFINE_STATE_WRAPPER(set_fmt, struct v4l2_subdev_format);
356 DEFINE_STATE_WRAPPER(enum_mbus_code, struct v4l2_subdev_mbus_code_enum);
357 DEFINE_STATE_WRAPPER(enum_frame_size, struct v4l2_subdev_frame_size_enum);
358 DEFINE_STATE_WRAPPER(enum_frame_interval, struct v4l2_subdev_frame_interval_enum);
359 DEFINE_STATE_WRAPPER(get_selection, struct v4l2_subdev_selection);
360 DEFINE_STATE_WRAPPER(set_selection, struct v4l2_subdev_selection);
361
362 static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
363 .get_fmt = call_get_fmt_state,
364 .set_fmt = call_set_fmt_state,
365 .enum_mbus_code = call_enum_mbus_code_state,
366 .enum_frame_size = call_enum_frame_size_state,
367 .enum_frame_interval = call_enum_frame_interval_state,
368 .get_selection = call_get_selection_state,
369 .set_selection = call_set_selection_state,
370 .get_edid = call_get_edid,
371 .set_edid = call_set_edid,
372 .dv_timings_cap = call_dv_timings_cap,
373 .enum_dv_timings = call_enum_dv_timings,
374 .get_mbus_config = call_get_mbus_config,
375 };
376
377 static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
378 .g_frame_interval = call_g_frame_interval,
379 .s_frame_interval = call_s_frame_interval,
380 };
381
382 const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
383 .pad = &v4l2_subdev_call_pad_wrappers,
384 .video = &v4l2_subdev_call_video_wrappers,
385 };
386 EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
387
388 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
389
390 static struct v4l2_subdev_state *
subdev_ioctl_get_state(struct v4l2_subdev * sd,struct v4l2_subdev_fh * subdev_fh,unsigned int cmd,void * arg)391 subdev_ioctl_get_state(struct v4l2_subdev *sd, struct v4l2_subdev_fh *subdev_fh,
392 unsigned int cmd, void *arg)
393 {
394 u32 which;
395
396 switch (cmd) {
397 default:
398 return NULL;
399 case VIDIOC_SUBDEV_G_FMT:
400 case VIDIOC_SUBDEV_S_FMT:
401 which = ((struct v4l2_subdev_format *)arg)->which;
402 break;
403 case VIDIOC_SUBDEV_G_CROP:
404 case VIDIOC_SUBDEV_S_CROP:
405 which = ((struct v4l2_subdev_crop *)arg)->which;
406 break;
407 case VIDIOC_SUBDEV_ENUM_MBUS_CODE:
408 which = ((struct v4l2_subdev_mbus_code_enum *)arg)->which;
409 break;
410 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE:
411 which = ((struct v4l2_subdev_frame_size_enum *)arg)->which;
412 break;
413 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL:
414 which = ((struct v4l2_subdev_frame_interval_enum *)arg)->which;
415 break;
416 case VIDIOC_SUBDEV_G_SELECTION:
417 case VIDIOC_SUBDEV_S_SELECTION:
418 which = ((struct v4l2_subdev_selection *)arg)->which;
419 break;
420 }
421
422 return which == V4L2_SUBDEV_FORMAT_TRY ?
423 subdev_fh->state :
424 v4l2_subdev_get_unlocked_active_state(sd);
425 }
426
subdev_do_ioctl(struct file * file,unsigned int cmd,void * arg,struct v4l2_subdev_state * state)427 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
428 struct v4l2_subdev_state *state)
429 {
430 struct video_device *vdev = video_devdata(file);
431 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
432 struct v4l2_fh *vfh = file->private_data;
433 bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
434 int rval;
435
436 switch (cmd) {
437 case VIDIOC_SUBDEV_QUERYCAP: {
438 struct v4l2_subdev_capability *cap = arg;
439
440 memset(cap->reserved, 0, sizeof(cap->reserved));
441 cap->version = LINUX_VERSION_CODE;
442 cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
443
444 return 0;
445 }
446
447 case VIDIOC_QUERYCTRL:
448 /*
449 * TODO: this really should be folded into v4l2_queryctrl (this
450 * currently returns -EINVAL for NULL control handlers).
451 * However, v4l2_queryctrl() is still called directly by
452 * drivers as well and until that has been addressed I believe
453 * it is safer to do the check here. The same is true for the
454 * other control ioctls below.
455 */
456 if (!vfh->ctrl_handler)
457 return -ENOTTY;
458 return v4l2_queryctrl(vfh->ctrl_handler, arg);
459
460 case VIDIOC_QUERY_EXT_CTRL:
461 if (!vfh->ctrl_handler)
462 return -ENOTTY;
463 return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
464
465 case VIDIOC_QUERYMENU:
466 if (!vfh->ctrl_handler)
467 return -ENOTTY;
468 return v4l2_querymenu(vfh->ctrl_handler, arg);
469
470 case VIDIOC_G_CTRL:
471 if (!vfh->ctrl_handler)
472 return -ENOTTY;
473 return v4l2_g_ctrl(vfh->ctrl_handler, arg);
474
475 case VIDIOC_S_CTRL:
476 if (!vfh->ctrl_handler)
477 return -ENOTTY;
478 return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
479
480 case VIDIOC_G_EXT_CTRLS:
481 if (!vfh->ctrl_handler)
482 return -ENOTTY;
483 return v4l2_g_ext_ctrls(vfh->ctrl_handler,
484 vdev, sd->v4l2_dev->mdev, arg);
485
486 case VIDIOC_S_EXT_CTRLS:
487 if (!vfh->ctrl_handler)
488 return -ENOTTY;
489 return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
490 vdev, sd->v4l2_dev->mdev, arg);
491
492 case VIDIOC_TRY_EXT_CTRLS:
493 if (!vfh->ctrl_handler)
494 return -ENOTTY;
495 return v4l2_try_ext_ctrls(vfh->ctrl_handler,
496 vdev, sd->v4l2_dev->mdev, arg);
497
498 case VIDIOC_DQEVENT:
499 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
500 return -ENOIOCTLCMD;
501
502 return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
503
504 case VIDIOC_SUBSCRIBE_EVENT:
505 return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
506
507 case VIDIOC_UNSUBSCRIBE_EVENT:
508 return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
509
510 #ifdef CONFIG_VIDEO_ADV_DEBUG
511 case VIDIOC_DBG_G_REGISTER:
512 {
513 struct v4l2_dbg_register *p = arg;
514
515 if (!capable(CAP_SYS_ADMIN))
516 return -EPERM;
517 return v4l2_subdev_call(sd, core, g_register, p);
518 }
519 case VIDIOC_DBG_S_REGISTER:
520 {
521 struct v4l2_dbg_register *p = arg;
522
523 if (!capable(CAP_SYS_ADMIN))
524 return -EPERM;
525 return v4l2_subdev_call(sd, core, s_register, p);
526 }
527 case VIDIOC_DBG_G_CHIP_INFO:
528 {
529 struct v4l2_dbg_chip_info *p = arg;
530
531 if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
532 return -EINVAL;
533 if (sd->ops->core && sd->ops->core->s_register)
534 p->flags |= V4L2_CHIP_FL_WRITABLE;
535 if (sd->ops->core && sd->ops->core->g_register)
536 p->flags |= V4L2_CHIP_FL_READABLE;
537 strscpy(p->name, sd->name, sizeof(p->name));
538 return 0;
539 }
540 #endif
541
542 case VIDIOC_LOG_STATUS: {
543 int ret;
544
545 pr_info("%s: ================= START STATUS =================\n",
546 sd->name);
547 ret = v4l2_subdev_call(sd, core, log_status);
548 pr_info("%s: ================== END STATUS ==================\n",
549 sd->name);
550 return ret;
551 }
552
553 case VIDIOC_SUBDEV_G_FMT: {
554 struct v4l2_subdev_format *format = arg;
555
556 memset(format->reserved, 0, sizeof(format->reserved));
557 memset(format->format.reserved, 0, sizeof(format->format.reserved));
558 return v4l2_subdev_call(sd, pad, get_fmt, state, format);
559 }
560
561 case VIDIOC_SUBDEV_S_FMT: {
562 struct v4l2_subdev_format *format = arg;
563
564 if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
565 return -EPERM;
566
567 memset(format->reserved, 0, sizeof(format->reserved));
568 memset(format->format.reserved, 0, sizeof(format->format.reserved));
569 return v4l2_subdev_call(sd, pad, set_fmt, state, format);
570 }
571
572 case VIDIOC_SUBDEV_G_CROP: {
573 struct v4l2_subdev_crop *crop = arg;
574 struct v4l2_subdev_selection sel;
575
576 memset(crop->reserved, 0, sizeof(crop->reserved));
577 memset(&sel, 0, sizeof(sel));
578 sel.which = crop->which;
579 sel.pad = crop->pad;
580 sel.target = V4L2_SEL_TGT_CROP;
581
582 rval = v4l2_subdev_call(
583 sd, pad, get_selection, state, &sel);
584
585 crop->rect = sel.r;
586
587 return rval;
588 }
589
590 case VIDIOC_SUBDEV_S_CROP: {
591 struct v4l2_subdev_crop *crop = arg;
592 struct v4l2_subdev_selection sel;
593
594 if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
595 return -EPERM;
596
597 memset(crop->reserved, 0, sizeof(crop->reserved));
598 memset(&sel, 0, sizeof(sel));
599 sel.which = crop->which;
600 sel.pad = crop->pad;
601 sel.target = V4L2_SEL_TGT_CROP;
602 sel.r = crop->rect;
603
604 rval = v4l2_subdev_call(
605 sd, pad, set_selection, state, &sel);
606
607 crop->rect = sel.r;
608
609 return rval;
610 }
611
612 case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
613 struct v4l2_subdev_mbus_code_enum *code = arg;
614
615 memset(code->reserved, 0, sizeof(code->reserved));
616 return v4l2_subdev_call(sd, pad, enum_mbus_code, state,
617 code);
618 }
619
620 case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
621 struct v4l2_subdev_frame_size_enum *fse = arg;
622
623 memset(fse->reserved, 0, sizeof(fse->reserved));
624 return v4l2_subdev_call(sd, pad, enum_frame_size, state,
625 fse);
626 }
627
628 case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
629 struct v4l2_subdev_frame_interval *fi = arg;
630
631 memset(fi->reserved, 0, sizeof(fi->reserved));
632 return v4l2_subdev_call(sd, video, g_frame_interval, arg);
633 }
634
635 case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
636 struct v4l2_subdev_frame_interval *fi = arg;
637
638 if (ro_subdev)
639 return -EPERM;
640
641 memset(fi->reserved, 0, sizeof(fi->reserved));
642 return v4l2_subdev_call(sd, video, s_frame_interval, arg);
643 }
644
645 case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
646 struct v4l2_subdev_frame_interval_enum *fie = arg;
647
648 memset(fie->reserved, 0, sizeof(fie->reserved));
649 return v4l2_subdev_call(sd, pad, enum_frame_interval, state,
650 fie);
651 }
652
653 case VIDIOC_SUBDEV_G_SELECTION: {
654 struct v4l2_subdev_selection *sel = arg;
655
656 memset(sel->reserved, 0, sizeof(sel->reserved));
657 return v4l2_subdev_call(
658 sd, pad, get_selection, state, sel);
659 }
660
661 case VIDIOC_SUBDEV_S_SELECTION: {
662 struct v4l2_subdev_selection *sel = arg;
663
664 if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
665 return -EPERM;
666
667 memset(sel->reserved, 0, sizeof(sel->reserved));
668 return v4l2_subdev_call(
669 sd, pad, set_selection, state, sel);
670 }
671
672 case VIDIOC_G_EDID: {
673 struct v4l2_subdev_edid *edid = arg;
674
675 return v4l2_subdev_call(sd, pad, get_edid, edid);
676 }
677
678 case VIDIOC_S_EDID: {
679 struct v4l2_subdev_edid *edid = arg;
680
681 return v4l2_subdev_call(sd, pad, set_edid, edid);
682 }
683
684 case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
685 struct v4l2_dv_timings_cap *cap = arg;
686
687 return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
688 }
689
690 case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
691 struct v4l2_enum_dv_timings *dvt = arg;
692
693 return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
694 }
695
696 case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
697 return v4l2_subdev_call(sd, video, query_dv_timings, arg);
698
699 case VIDIOC_SUBDEV_G_DV_TIMINGS:
700 return v4l2_subdev_call(sd, video, g_dv_timings, arg);
701
702 case VIDIOC_SUBDEV_S_DV_TIMINGS:
703 if (ro_subdev)
704 return -EPERM;
705
706 return v4l2_subdev_call(sd, video, s_dv_timings, arg);
707
708 case VIDIOC_SUBDEV_G_STD:
709 return v4l2_subdev_call(sd, video, g_std, arg);
710
711 case VIDIOC_SUBDEV_S_STD: {
712 v4l2_std_id *std = arg;
713
714 if (ro_subdev)
715 return -EPERM;
716
717 return v4l2_subdev_call(sd, video, s_std, *std);
718 }
719
720 case VIDIOC_SUBDEV_ENUMSTD: {
721 struct v4l2_standard *p = arg;
722 v4l2_std_id id;
723
724 if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
725 return -EINVAL;
726
727 return v4l_video_std_enumstd(p, id);
728 }
729
730 case VIDIOC_SUBDEV_QUERYSTD:
731 return v4l2_subdev_call(sd, video, querystd, arg);
732
733 default:
734 return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
735 }
736
737 return 0;
738 }
739
subdev_do_ioctl_lock(struct file * file,unsigned int cmd,void * arg)740 static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
741 {
742 struct video_device *vdev = video_devdata(file);
743 struct mutex *lock = vdev->lock;
744 long ret = -ENODEV;
745
746 if (lock && mutex_lock_interruptible(lock))
747 return -ERESTARTSYS;
748
749 if (video_is_registered(vdev)) {
750 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
751 struct v4l2_fh *vfh = file->private_data;
752 struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
753 struct v4l2_subdev_state *state;
754
755 state = subdev_ioctl_get_state(sd, subdev_fh, cmd, arg);
756
757 if (state)
758 v4l2_subdev_lock_state(state);
759
760 ret = subdev_do_ioctl(file, cmd, arg, state);
761
762 if (state)
763 v4l2_subdev_unlock_state(state);
764 }
765
766 if (lock)
767 mutex_unlock(lock);
768 return ret;
769 }
770
subdev_ioctl(struct file * file,unsigned int cmd,unsigned long arg)771 static long subdev_ioctl(struct file *file, unsigned int cmd,
772 unsigned long arg)
773 {
774 return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
775 }
776
777 #ifdef CONFIG_COMPAT
subdev_compat_ioctl32(struct file * file,unsigned int cmd,unsigned long arg)778 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
779 unsigned long arg)
780 {
781 struct video_device *vdev = video_devdata(file);
782 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
783
784 return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
785 }
786 #endif
787
788 #else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
subdev_ioctl(struct file * file,unsigned int cmd,unsigned long arg)789 static long subdev_ioctl(struct file *file, unsigned int cmd,
790 unsigned long arg)
791 {
792 return -ENODEV;
793 }
794
795 #ifdef CONFIG_COMPAT
subdev_compat_ioctl32(struct file * file,unsigned int cmd,unsigned long arg)796 static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
797 unsigned long arg)
798 {
799 return -ENODEV;
800 }
801 #endif
802 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
803
subdev_poll(struct file * file,poll_table * wait)804 static __poll_t subdev_poll(struct file *file, poll_table *wait)
805 {
806 struct video_device *vdev = video_devdata(file);
807 struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
808 struct v4l2_fh *fh = file->private_data;
809
810 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
811 return EPOLLERR;
812
813 poll_wait(file, &fh->wait, wait);
814
815 if (v4l2_event_pending(fh))
816 return EPOLLPRI;
817
818 return 0;
819 }
820
821 const struct v4l2_file_operations v4l2_subdev_fops = {
822 .owner = THIS_MODULE,
823 .open = subdev_open,
824 .unlocked_ioctl = subdev_ioctl,
825 #ifdef CONFIG_COMPAT
826 .compat_ioctl32 = subdev_compat_ioctl32,
827 #endif
828 .release = subdev_close,
829 .poll = subdev_poll,
830 };
831
832 #ifdef CONFIG_MEDIA_CONTROLLER
833
v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity * entity,struct fwnode_endpoint * endpoint)834 int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
835 struct fwnode_endpoint *endpoint)
836 {
837 struct fwnode_handle *fwnode;
838 struct v4l2_subdev *sd;
839
840 if (!is_media_entity_v4l2_subdev(entity))
841 return -EINVAL;
842
843 sd = media_entity_to_v4l2_subdev(entity);
844
845 fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode);
846 fwnode_handle_put(fwnode);
847
848 if (dev_fwnode(sd->dev) == fwnode)
849 return endpoint->port;
850
851 return -ENXIO;
852 }
853 EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1);
854
v4l2_subdev_link_validate_default(struct v4l2_subdev * sd,struct media_link * link,struct v4l2_subdev_format * source_fmt,struct v4l2_subdev_format * sink_fmt)855 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
856 struct media_link *link,
857 struct v4l2_subdev_format *source_fmt,
858 struct v4l2_subdev_format *sink_fmt)
859 {
860 bool pass = true;
861
862 /* The width, height and code must match. */
863 if (source_fmt->format.width != sink_fmt->format.width) {
864 dev_dbg(sd->entity.graph_obj.mdev->dev,
865 "%s: width does not match (source %u, sink %u)\n",
866 __func__,
867 source_fmt->format.width, sink_fmt->format.width);
868 pass = false;
869 }
870
871 if (source_fmt->format.height != sink_fmt->format.height) {
872 dev_dbg(sd->entity.graph_obj.mdev->dev,
873 "%s: height does not match (source %u, sink %u)\n",
874 __func__,
875 source_fmt->format.height, sink_fmt->format.height);
876 pass = false;
877 }
878
879 if (source_fmt->format.code != sink_fmt->format.code) {
880 dev_dbg(sd->entity.graph_obj.mdev->dev,
881 "%s: media bus code does not match (source 0x%8.8x, sink 0x%8.8x)\n",
882 __func__,
883 source_fmt->format.code, sink_fmt->format.code);
884 pass = false;
885 }
886
887 /* The field order must match, or the sink field order must be NONE
888 * to support interlaced hardware connected to bridges that support
889 * progressive formats only.
890 */
891 if (source_fmt->format.field != sink_fmt->format.field &&
892 sink_fmt->format.field != V4L2_FIELD_NONE) {
893 dev_dbg(sd->entity.graph_obj.mdev->dev,
894 "%s: field does not match (source %u, sink %u)\n",
895 __func__,
896 source_fmt->format.field, sink_fmt->format.field);
897 pass = false;
898 }
899
900 if (pass)
901 return 0;
902
903 dev_dbg(sd->entity.graph_obj.mdev->dev,
904 "%s: link was \"%s\":%u -> \"%s\":%u\n", __func__,
905 link->source->entity->name, link->source->index,
906 link->sink->entity->name, link->sink->index);
907
908 return -EPIPE;
909 }
910 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
911
912 static int
v4l2_subdev_link_validate_get_format(struct media_pad * pad,struct v4l2_subdev_format * fmt)913 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
914 struct v4l2_subdev_format *fmt)
915 {
916 if (is_media_entity_v4l2_subdev(pad->entity)) {
917 struct v4l2_subdev *sd =
918 media_entity_to_v4l2_subdev(pad->entity);
919
920 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
921 fmt->pad = pad->index;
922 return v4l2_subdev_call_state_active(sd, pad, get_fmt, fmt);
923 }
924
925 WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
926 "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
927 pad->entity->function, pad->entity->name);
928
929 return -EINVAL;
930 }
931
v4l2_subdev_link_validate(struct media_link * link)932 int v4l2_subdev_link_validate(struct media_link *link)
933 {
934 struct v4l2_subdev *sink;
935 struct v4l2_subdev_format sink_fmt, source_fmt;
936 int rval;
937
938 rval = v4l2_subdev_link_validate_get_format(
939 link->source, &source_fmt);
940 if (rval < 0)
941 return 0;
942
943 rval = v4l2_subdev_link_validate_get_format(
944 link->sink, &sink_fmt);
945 if (rval < 0)
946 return 0;
947
948 sink = media_entity_to_v4l2_subdev(link->sink->entity);
949
950 rval = v4l2_subdev_call(sink, pad, link_validate, link,
951 &source_fmt, &sink_fmt);
952 if (rval != -ENOIOCTLCMD)
953 return rval;
954
955 return v4l2_subdev_link_validate_default(
956 sink, link, &source_fmt, &sink_fmt);
957 }
958 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
959
960 struct v4l2_subdev_state *
__v4l2_subdev_state_alloc(struct v4l2_subdev * sd,const char * lock_name,struct lock_class_key * lock_key)961 __v4l2_subdev_state_alloc(struct v4l2_subdev *sd, const char *lock_name,
962 struct lock_class_key *lock_key)
963 {
964 struct v4l2_subdev_state *state;
965 int ret;
966
967 state = kzalloc(sizeof(*state), GFP_KERNEL);
968 if (!state)
969 return ERR_PTR(-ENOMEM);
970
971 __mutex_init(&state->_lock, lock_name, lock_key);
972 if (sd->state_lock)
973 state->lock = sd->state_lock;
974 else
975 state->lock = &state->_lock;
976
977 if (sd->entity.num_pads) {
978 state->pads = kvcalloc(sd->entity.num_pads,
979 sizeof(*state->pads), GFP_KERNEL);
980 if (!state->pads) {
981 ret = -ENOMEM;
982 goto err;
983 }
984 }
985
986 /*
987 * There can be no race at this point, but we lock the state anyway to
988 * satisfy lockdep checks.
989 */
990 v4l2_subdev_lock_state(state);
991 ret = v4l2_subdev_call(sd, pad, init_cfg, state);
992 v4l2_subdev_unlock_state(state);
993
994 if (ret < 0 && ret != -ENOIOCTLCMD)
995 goto err;
996
997 return state;
998
999 err:
1000 if (state && state->pads)
1001 kvfree(state->pads);
1002
1003 kfree(state);
1004
1005 return ERR_PTR(ret);
1006 }
1007 EXPORT_SYMBOL_GPL(__v4l2_subdev_state_alloc);
1008
__v4l2_subdev_state_free(struct v4l2_subdev_state * state)1009 void __v4l2_subdev_state_free(struct v4l2_subdev_state *state)
1010 {
1011 if (!state)
1012 return;
1013
1014 mutex_destroy(&state->_lock);
1015
1016 kvfree(state->pads);
1017 kfree(state);
1018 }
1019 EXPORT_SYMBOL_GPL(__v4l2_subdev_state_free);
1020
__v4l2_subdev_init_finalize(struct v4l2_subdev * sd,const char * name,struct lock_class_key * key)1021 int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name,
1022 struct lock_class_key *key)
1023 {
1024 struct v4l2_subdev_state *state;
1025
1026 state = __v4l2_subdev_state_alloc(sd, name, key);
1027 if (IS_ERR(state))
1028 return PTR_ERR(state);
1029
1030 sd->active_state = state;
1031
1032 return 0;
1033 }
1034 EXPORT_SYMBOL_GPL(__v4l2_subdev_init_finalize);
1035
v4l2_subdev_cleanup(struct v4l2_subdev * sd)1036 void v4l2_subdev_cleanup(struct v4l2_subdev *sd)
1037 {
1038 __v4l2_subdev_state_free(sd->active_state);
1039 sd->active_state = NULL;
1040 }
1041 EXPORT_SYMBOL_GPL(v4l2_subdev_cleanup);
1042
1043 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
1044
v4l2_subdev_get_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_format * format)1045 int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
1046 struct v4l2_subdev_format *format)
1047 {
1048 struct v4l2_mbus_framefmt *fmt;
1049
1050 if (format->pad >= sd->entity.num_pads)
1051 return -EINVAL;
1052
1053 fmt = v4l2_subdev_get_pad_format(sd, state, format->pad);
1054 if (!fmt)
1055 return -EINVAL;
1056
1057 format->format = *fmt;
1058
1059 return 0;
1060 }
1061 EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt);
1062
1063 #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
1064
1065 #endif /* CONFIG_MEDIA_CONTROLLER */
1066
v4l2_subdev_init(struct v4l2_subdev * sd,const struct v4l2_subdev_ops * ops)1067 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
1068 {
1069 INIT_LIST_HEAD(&sd->list);
1070 BUG_ON(!ops);
1071 sd->ops = ops;
1072 sd->v4l2_dev = NULL;
1073 sd->flags = 0;
1074 sd->name[0] = '\0';
1075 sd->grp_id = 0;
1076 sd->dev_priv = NULL;
1077 sd->host_priv = NULL;
1078 #if defined(CONFIG_MEDIA_CONTROLLER)
1079 sd->entity.name = sd->name;
1080 sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
1081 sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
1082 #endif
1083 }
1084 EXPORT_SYMBOL(v4l2_subdev_init);
1085
v4l2_subdev_notify_event(struct v4l2_subdev * sd,const struct v4l2_event * ev)1086 void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
1087 const struct v4l2_event *ev)
1088 {
1089 v4l2_event_queue(sd->devnode, ev);
1090 v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
1091 }
1092 EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);
1093