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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Componentized device handling.
4 */
5#include <linux/component.h>
6#include <linux/device.h>
7#include <linux/list.h>
8#include <linux/mutex.h>
9#include <linux/of.h>
10#include <linux/slab.h>
11#include <linux/debugfs.h>
12
13/**
14 * DOC: overview
15 *
16 * The component helper allows drivers to collect a pile of sub-devices,
17 * including their bound drivers, into an aggregate driver. Various subsystems
18 * already provide functions to get hold of such components, e.g.
19 * of_clk_get_by_name(). The component helper can be used when such a
20 * subsystem-specific way to find a device is not available: The component
21 * helper fills the niche of aggregate drivers for specific hardware, where
22 * further standardization into a subsystem would not be practical. The common
23 * example is when a logical device (e.g. a DRM display driver) is spread around
24 * the SoC on various components (scanout engines, blending blocks, transcoders
25 * for various outputs and so on).
26 *
27 * The component helper also doesn't solve runtime dependencies, e.g. for system
28 * suspend and resume operations. See also :ref:`device links<device_link>`.
29 *
30 * Components are registered using component_add() and unregistered with
31 * component_del(), usually from the driver's probe and disconnect functions.
32 *
33 * Aggregate drivers first assemble a component match list of what they need
34 * using component_match_add(). This is then registered as an aggregate driver
35 * using component_master_add_with_match(), and unregistered using
36 * component_master_del().
37 */
38
39struct component;
40
41struct component_match_array {
42 void *data;
43 int (*compare)(struct device *, void *);
44 int (*compare_typed)(struct device *, int, void *);
45 void (*release)(struct device *, void *);
46 struct component *component;
47 bool duplicate;
48};
49
50struct component_match {
51 size_t alloc;
52 size_t num;
53 struct component_match_array *compare;
54};
55
56struct aggregate_device {
57 struct list_head node;
58 bool bound;
59
60 const struct component_master_ops *ops;
61 struct device *parent;
62 struct component_match *match;
63};
64
65struct component {
66 struct list_head node;
67 struct aggregate_device *adev;
68 bool bound;
69
70 const struct component_ops *ops;
71 int subcomponent;
72 struct device *dev;
73};
74
75static DEFINE_MUTEX(component_mutex);
76static LIST_HEAD(component_list);
77static LIST_HEAD(aggregate_devices);
78
79#ifdef CONFIG_DEBUG_FS
80
81static struct dentry *component_debugfs_dir;
82
83static int component_devices_show(struct seq_file *s, void *data)
84{
85 struct aggregate_device *m = s->private;
86 struct component_match *match = m->match;
87 size_t i;
88
89 mutex_lock(&component_mutex);
90 seq_printf(s, "%-40s %20s\n", "aggregate_device name", "status");
91 seq_puts(s, "-------------------------------------------------------------\n");
92 seq_printf(s, "%-40s %20s\n\n",
93 dev_name(m->parent), m->bound ? "bound" : "not bound");
94
95 seq_printf(s, "%-40s %20s\n", "device name", "status");
96 seq_puts(s, "-------------------------------------------------------------\n");
97 for (i = 0; i < match->num; i++) {
98 struct component *component = match->compare[i].component;
99
100 seq_printf(s, "%-40s %20s\n",
101 component ? dev_name(component->dev) : "(unknown)",
102 component ? (component->bound ? "bound" : "not bound") : "not registered");
103 }
104 mutex_unlock(&component_mutex);
105
106 return 0;
107}
108
109DEFINE_SHOW_ATTRIBUTE(component_devices);
110
111static int __init component_debug_init(void)
112{
113 component_debugfs_dir = debugfs_create_dir("device_component", NULL);
114
115 return 0;
116}
117
118core_initcall(component_debug_init);
119
120static void component_debugfs_add(struct aggregate_device *m)
121{
122 debugfs_create_file(dev_name(m->parent), 0444, component_debugfs_dir, m,
123 &component_devices_fops);
124}
125
126static void component_debugfs_del(struct aggregate_device *m)
127{
128 debugfs_lookup_and_remove(dev_name(m->parent), component_debugfs_dir);
129}
130
131#else
132
133static void component_debugfs_add(struct aggregate_device *m)
134{ }
135
136static void component_debugfs_del(struct aggregate_device *m)
137{ }
138
139#endif
140
141static struct aggregate_device *__aggregate_find(struct device *parent,
142 const struct component_master_ops *ops)
143{
144 struct aggregate_device *m;
145
146 list_for_each_entry(m, &aggregate_devices, node)
147 if (m->parent == parent && (!ops || m->ops == ops))
148 return m;
149
150 return NULL;
151}
152
153static struct component *find_component(struct aggregate_device *adev,
154 struct component_match_array *mc)
155{
156 struct component *c;
157
158 list_for_each_entry(c, &component_list, node) {
159 if (c->adev && c->adev != adev)
160 continue;
161
162 if (mc->compare && mc->compare(c->dev, mc->data))
163 return c;
164
165 if (mc->compare_typed &&
166 mc->compare_typed(c->dev, c->subcomponent, mc->data))
167 return c;
168 }
169
170 return NULL;
171}
172
173static int find_components(struct aggregate_device *adev)
174{
175 struct component_match *match = adev->match;
176 size_t i;
177 int ret = 0;
178
179 /*
180 * Scan the array of match functions and attach
181 * any components which are found to this adev.
182 */
183 for (i = 0; i < match->num; i++) {
184 struct component_match_array *mc = &match->compare[i];
185 struct component *c;
186
187 dev_dbg(adev->parent, "Looking for component %zu\n", i);
188
189 if (match->compare[i].component)
190 continue;
191
192 c = find_component(adev, mc);
193 if (!c) {
194 ret = -ENXIO;
195 break;
196 }
197
198 dev_dbg(adev->parent, "found component %s, duplicate %u\n",
199 dev_name(c->dev), !!c->adev);
200
201 /* Attach this component to the adev */
202 match->compare[i].duplicate = !!c->adev;
203 match->compare[i].component = c;
204 c->adev = adev;
205 }
206 return ret;
207}
208
209/* Detach component from associated aggregate_device */
210static void remove_component(struct aggregate_device *adev, struct component *c)
211{
212 size_t i;
213
214 /* Detach the component from this adev. */
215 for (i = 0; i < adev->match->num; i++)
216 if (adev->match->compare[i].component == c)
217 adev->match->compare[i].component = NULL;
218}
219
220/*
221 * Try to bring up an aggregate device. If component is NULL, we're interested
222 * in this aggregate device, otherwise it's a component which must be present
223 * to try and bring up the aggregate device.
224 *
225 * Returns 1 for successful bringup, 0 if not ready, or -ve errno.
226 */
227static int try_to_bring_up_aggregate_device(struct aggregate_device *adev,
228 struct component *component)
229{
230 int ret;
231
232 dev_dbg(adev->parent, "trying to bring up adev\n");
233
234 if (find_components(adev)) {
235 dev_dbg(adev->parent, "master has incomplete components\n");
236 return 0;
237 }
238
239 if (component && component->adev != adev) {
240 dev_dbg(adev->parent, "master is not for this component (%s)\n",
241 dev_name(component->dev));
242 return 0;
243 }
244
245 if (!devres_open_group(adev->parent, adev, GFP_KERNEL))
246 return -ENOMEM;
247
248 /* Found all components */
249 ret = adev->ops->bind(adev->parent);
250 if (ret < 0) {
251 devres_release_group(adev->parent, NULL);
252 if (ret != -EPROBE_DEFER)
253 dev_info(adev->parent, "adev bind failed: %d\n", ret);
254 return ret;
255 }
256
257 devres_close_group(adev->parent, NULL);
258 adev->bound = true;
259 return 1;
260}
261
262static int try_to_bring_up_masters(struct component *component)
263{
264 struct aggregate_device *adev;
265 int ret = 0;
266
267 list_for_each_entry(adev, &aggregate_devices, node) {
268 if (!adev->bound) {
269 ret = try_to_bring_up_aggregate_device(adev, component);
270 if (ret != 0)
271 break;
272 }
273 }
274
275 return ret;
276}
277
278static void take_down_aggregate_device(struct aggregate_device *adev)
279{
280 if (adev->bound) {
281 adev->ops->unbind(adev->parent);
282 devres_release_group(adev->parent, adev);
283 adev->bound = false;
284 }
285}
286
287/**
288 * component_compare_of - A common component compare function for of_node
289 * @dev: component device
290 * @data: @compare_data from component_match_add_release()
291 *
292 * A common compare function when compare_data is device of_node. e.g.
293 * component_match_add_release(masterdev, &match, component_release_of,
294 * component_compare_of, component_dev_of_node)
295 */
296int component_compare_of(struct device *dev, void *data)
297{
298 return device_match_of_node(dev, data);
299}
300EXPORT_SYMBOL_GPL(component_compare_of);
301
302/**
303 * component_release_of - A common component release function for of_node
304 * @dev: component device
305 * @data: @compare_data from component_match_add_release()
306 *
307 * About the example, Please see component_compare_of().
308 */
309void component_release_of(struct device *dev, void *data)
310{
311 of_node_put(data);
312}
313EXPORT_SYMBOL_GPL(component_release_of);
314
315/**
316 * component_compare_dev - A common component compare function for dev
317 * @dev: component device
318 * @data: @compare_data from component_match_add_release()
319 *
320 * A common compare function when compare_data is struce device. e.g.
321 * component_match_add(masterdev, &match, component_compare_dev, component_dev)
322 */
323int component_compare_dev(struct device *dev, void *data)
324{
325 return dev == data;
326}
327EXPORT_SYMBOL_GPL(component_compare_dev);
328
329/**
330 * component_compare_dev_name - A common component compare function for device name
331 * @dev: component device
332 * @data: @compare_data from component_match_add_release()
333 *
334 * A common compare function when compare_data is device name string. e.g.
335 * component_match_add(masterdev, &match, component_compare_dev_name,
336 * "component_dev_name")
337 */
338int component_compare_dev_name(struct device *dev, void *data)
339{
340 return device_match_name(dev, data);
341}
342EXPORT_SYMBOL_GPL(component_compare_dev_name);
343
344static void devm_component_match_release(struct device *parent, void *res)
345{
346 struct component_match *match = res;
347 unsigned int i;
348
349 for (i = 0; i < match->num; i++) {
350 struct component_match_array *mc = &match->compare[i];
351
352 if (mc->release)
353 mc->release(parent, mc->data);
354 }
355
356 kfree(match->compare);
357}
358
359static int component_match_realloc(struct component_match *match, size_t num)
360{
361 struct component_match_array *new;
362
363 if (match->alloc == num)
364 return 0;
365
366 new = kmalloc_array(num, sizeof(*new), GFP_KERNEL);
367 if (!new)
368 return -ENOMEM;
369
370 if (match->compare) {
371 memcpy(new, match->compare, sizeof(*new) *
372 min(match->num, num));
373 kfree(match->compare);
374 }
375 match->compare = new;
376 match->alloc = num;
377
378 return 0;
379}
380
381static void __component_match_add(struct device *parent,
382 struct component_match **matchptr,
383 void (*release)(struct device *, void *),
384 int (*compare)(struct device *, void *),
385 int (*compare_typed)(struct device *, int, void *),
386 void *compare_data)
387{
388 struct component_match *match = *matchptr;
389
390 if (IS_ERR(match))
391 return;
392
393 if (!match) {
394 match = devres_alloc(devm_component_match_release,
395 sizeof(*match), GFP_KERNEL);
396 if (!match) {
397 *matchptr = ERR_PTR(-ENOMEM);
398 return;
399 }
400
401 devres_add(parent, match);
402
403 *matchptr = match;
404 }
405
406 if (match->num == match->alloc) {
407 size_t new_size = match->alloc + 16;
408 int ret;
409
410 ret = component_match_realloc(match, new_size);
411 if (ret) {
412 *matchptr = ERR_PTR(ret);
413 return;
414 }
415 }
416
417 match->compare[match->num].compare = compare;
418 match->compare[match->num].compare_typed = compare_typed;
419 match->compare[match->num].release = release;
420 match->compare[match->num].data = compare_data;
421 match->compare[match->num].component = NULL;
422 match->num++;
423}
424
425/**
426 * component_match_add_release - add a component match entry with release callback
427 * @parent: parent device of the aggregate driver
428 * @matchptr: pointer to the list of component matches
429 * @release: release function for @compare_data
430 * @compare: compare function to match against all components
431 * @compare_data: opaque pointer passed to the @compare function
432 *
433 * Adds a new component match to the list stored in @matchptr, which the
434 * aggregate driver needs to function. The list of component matches pointed to
435 * by @matchptr must be initialized to NULL before adding the first match. This
436 * only matches against components added with component_add().
437 *
438 * The allocated match list in @matchptr is automatically released using devm
439 * actions, where upon @release will be called to free any references held by
440 * @compare_data, e.g. when @compare_data is a &device_node that must be
441 * released with of_node_put().
442 *
443 * See also component_match_add() and component_match_add_typed().
444 */
445void component_match_add_release(struct device *parent,
446 struct component_match **matchptr,
447 void (*release)(struct device *, void *),
448 int (*compare)(struct device *, void *), void *compare_data)
449{
450 __component_match_add(parent, matchptr, release, compare, NULL,
451 compare_data);
452}
453EXPORT_SYMBOL(component_match_add_release);
454
455/**
456 * component_match_add_typed - add a component match entry for a typed component
457 * @parent: parent device of the aggregate driver
458 * @matchptr: pointer to the list of component matches
459 * @compare_typed: compare function to match against all typed components
460 * @compare_data: opaque pointer passed to the @compare function
461 *
462 * Adds a new component match to the list stored in @matchptr, which the
463 * aggregate driver needs to function. The list of component matches pointed to
464 * by @matchptr must be initialized to NULL before adding the first match. This
465 * only matches against components added with component_add_typed().
466 *
467 * The allocated match list in @matchptr is automatically released using devm
468 * actions.
469 *
470 * See also component_match_add_release() and component_match_add_typed().
471 */
472void component_match_add_typed(struct device *parent,
473 struct component_match **matchptr,
474 int (*compare_typed)(struct device *, int, void *), void *compare_data)
475{
476 __component_match_add(parent, matchptr, NULL, NULL, compare_typed,
477 compare_data);
478}
479EXPORT_SYMBOL(component_match_add_typed);
480
481static void free_aggregate_device(struct aggregate_device *adev)
482{
483 struct component_match *match = adev->match;
484 int i;
485
486 component_debugfs_del(adev);
487 list_del(&adev->node);
488
489 if (match) {
490 for (i = 0; i < match->num; i++) {
491 struct component *c = match->compare[i].component;
492 if (c)
493 c->adev = NULL;
494 }
495 }
496
497 kfree(adev);
498}
499
500/**
501 * component_master_add_with_match - register an aggregate driver
502 * @parent: parent device of the aggregate driver
503 * @ops: callbacks for the aggregate driver
504 * @match: component match list for the aggregate driver
505 *
506 * Registers a new aggregate driver consisting of the components added to @match
507 * by calling one of the component_match_add() functions. Once all components in
508 * @match are available, it will be assembled by calling
509 * &component_master_ops.bind from @ops. Must be unregistered by calling
510 * component_master_del().
511 */
512int component_master_add_with_match(struct device *parent,
513 const struct component_master_ops *ops,
514 struct component_match *match)
515{
516 struct aggregate_device *adev;
517 int ret;
518
519 /* Reallocate the match array for its true size */
520 ret = component_match_realloc(match, match->num);
521 if (ret)
522 return ret;
523
524 adev = kzalloc(sizeof(*adev), GFP_KERNEL);
525 if (!adev)
526 return -ENOMEM;
527
528 adev->parent = parent;
529 adev->ops = ops;
530 adev->match = match;
531
532 component_debugfs_add(adev);
533 /* Add to the list of available aggregate devices. */
534 mutex_lock(&component_mutex);
535 list_add(&adev->node, &aggregate_devices);
536
537 ret = try_to_bring_up_aggregate_device(adev, NULL);
538
539 if (ret < 0)
540 free_aggregate_device(adev);
541
542 mutex_unlock(&component_mutex);
543
544 return ret < 0 ? ret : 0;
545}
546EXPORT_SYMBOL_GPL(component_master_add_with_match);
547
548/**
549 * component_master_del - unregister an aggregate driver
550 * @parent: parent device of the aggregate driver
551 * @ops: callbacks for the aggregate driver
552 *
553 * Unregisters an aggregate driver registered with
554 * component_master_add_with_match(). If necessary the aggregate driver is first
555 * disassembled by calling &component_master_ops.unbind from @ops.
556 */
557void component_master_del(struct device *parent,
558 const struct component_master_ops *ops)
559{
560 struct aggregate_device *adev;
561
562 mutex_lock(&component_mutex);
563 adev = __aggregate_find(parent, ops);
564 if (adev) {
565 take_down_aggregate_device(adev);
566 free_aggregate_device(adev);
567 }
568 mutex_unlock(&component_mutex);
569}
570EXPORT_SYMBOL_GPL(component_master_del);
571
572static void component_unbind(struct component *component,
573 struct aggregate_device *adev, void *data)
574{
575 WARN_ON(!component->bound);
576
577 if (component->ops && component->ops->unbind)
578 component->ops->unbind(component->dev, adev->parent, data);
579 component->bound = false;
580
581 /* Release all resources claimed in the binding of this component */
582 devres_release_group(component->dev, component);
583}
584
585/**
586 * component_unbind_all - unbind all components of an aggregate driver
587 * @parent: parent device of the aggregate driver
588 * @data: opaque pointer, passed to all components
589 *
590 * Unbinds all components of the aggregate device by passing @data to their
591 * &component_ops.unbind functions. Should be called from
592 * &component_master_ops.unbind.
593 */
594void component_unbind_all(struct device *parent, void *data)
595{
596 struct aggregate_device *adev;
597 struct component *c;
598 size_t i;
599
600 WARN_ON(!mutex_is_locked(&component_mutex));
601
602 adev = __aggregate_find(parent, NULL);
603 if (!adev)
604 return;
605
606 /* Unbind components in reverse order */
607 for (i = adev->match->num; i--; )
608 if (!adev->match->compare[i].duplicate) {
609 c = adev->match->compare[i].component;
610 component_unbind(c, adev, data);
611 }
612}
613EXPORT_SYMBOL_GPL(component_unbind_all);
614
615static int component_bind(struct component *component, struct aggregate_device *adev,
616 void *data)
617{
618 int ret;
619
620 /*
621 * Each component initialises inside its own devres group.
622 * This allows us to roll-back a failed component without
623 * affecting anything else.
624 */
625 if (!devres_open_group(adev->parent, NULL, GFP_KERNEL))
626 return -ENOMEM;
627
628 /*
629 * Also open a group for the device itself: this allows us
630 * to release the resources claimed against the sub-device
631 * at the appropriate moment.
632 */
633 if (!devres_open_group(component->dev, component, GFP_KERNEL)) {
634 devres_release_group(adev->parent, NULL);
635 return -ENOMEM;
636 }
637
638 dev_dbg(adev->parent, "binding %s (ops %ps)\n",
639 dev_name(component->dev), component->ops);
640
641 ret = component->ops->bind(component->dev, adev->parent, data);
642 if (!ret) {
643 component->bound = true;
644
645 /*
646 * Close the component device's group so that resources
647 * allocated in the binding are encapsulated for removal
648 * at unbind. Remove the group on the DRM device as we
649 * can clean those resources up independently.
650 */
651 devres_close_group(component->dev, NULL);
652 devres_remove_group(adev->parent, NULL);
653
654 dev_info(adev->parent, "bound %s (ops %ps)\n",
655 dev_name(component->dev), component->ops);
656 } else {
657 devres_release_group(component->dev, NULL);
658 devres_release_group(adev->parent, NULL);
659
660 if (ret != -EPROBE_DEFER)
661 dev_err(adev->parent, "failed to bind %s (ops %ps): %d\n",
662 dev_name(component->dev), component->ops, ret);
663 }
664
665 return ret;
666}
667
668/**
669 * component_bind_all - bind all components of an aggregate driver
670 * @parent: parent device of the aggregate driver
671 * @data: opaque pointer, passed to all components
672 *
673 * Binds all components of the aggregate @dev by passing @data to their
674 * &component_ops.bind functions. Should be called from
675 * &component_master_ops.bind.
676 */
677int component_bind_all(struct device *parent, void *data)
678{
679 struct aggregate_device *adev;
680 struct component *c;
681 size_t i;
682 int ret = 0;
683
684 WARN_ON(!mutex_is_locked(&component_mutex));
685
686 adev = __aggregate_find(parent, NULL);
687 if (!adev)
688 return -EINVAL;
689
690 /* Bind components in match order */
691 for (i = 0; i < adev->match->num; i++)
692 if (!adev->match->compare[i].duplicate) {
693 c = adev->match->compare[i].component;
694 ret = component_bind(c, adev, data);
695 if (ret)
696 break;
697 }
698
699 if (ret != 0) {
700 for (; i > 0; i--)
701 if (!adev->match->compare[i - 1].duplicate) {
702 c = adev->match->compare[i - 1].component;
703 component_unbind(c, adev, data);
704 }
705 }
706
707 return ret;
708}
709EXPORT_SYMBOL_GPL(component_bind_all);
710
711static int __component_add(struct device *dev, const struct component_ops *ops,
712 int subcomponent)
713{
714 struct component *component;
715 int ret;
716
717 component = kzalloc(sizeof(*component), GFP_KERNEL);
718 if (!component)
719 return -ENOMEM;
720
721 component->ops = ops;
722 component->dev = dev;
723 component->subcomponent = subcomponent;
724
725 dev_dbg(dev, "adding component (ops %ps)\n", ops);
726
727 mutex_lock(&component_mutex);
728 list_add_tail(&component->node, &component_list);
729
730 ret = try_to_bring_up_masters(component);
731 if (ret < 0) {
732 if (component->adev)
733 remove_component(component->adev, component);
734 list_del(&component->node);
735
736 kfree(component);
737 }
738 mutex_unlock(&component_mutex);
739
740 return ret < 0 ? ret : 0;
741}
742
743/**
744 * component_add_typed - register a component
745 * @dev: component device
746 * @ops: component callbacks
747 * @subcomponent: nonzero identifier for subcomponents
748 *
749 * Register a new component for @dev. Functions in @ops will be call when the
750 * aggregate driver is ready to bind the overall driver by calling
751 * component_bind_all(). See also &struct component_ops.
752 *
753 * @subcomponent must be nonzero and is used to differentiate between multiple
754 * components registerd on the same device @dev. These components are match
755 * using component_match_add_typed().
756 *
757 * The component needs to be unregistered at driver unload/disconnect by
758 * calling component_del().
759 *
760 * See also component_add().
761 */
762int component_add_typed(struct device *dev, const struct component_ops *ops,
763 int subcomponent)
764{
765 if (WARN_ON(subcomponent == 0))
766 return -EINVAL;
767
768 return __component_add(dev, ops, subcomponent);
769}
770EXPORT_SYMBOL_GPL(component_add_typed);
771
772/**
773 * component_add - register a component
774 * @dev: component device
775 * @ops: component callbacks
776 *
777 * Register a new component for @dev. Functions in @ops will be called when the
778 * aggregate driver is ready to bind the overall driver by calling
779 * component_bind_all(). See also &struct component_ops.
780 *
781 * The component needs to be unregistered at driver unload/disconnect by
782 * calling component_del().
783 *
784 * See also component_add_typed() for a variant that allows multipled different
785 * components on the same device.
786 */
787int component_add(struct device *dev, const struct component_ops *ops)
788{
789 return __component_add(dev, ops, 0);
790}
791EXPORT_SYMBOL_GPL(component_add);
792
793/**
794 * component_del - unregister a component
795 * @dev: component device
796 * @ops: component callbacks
797 *
798 * Unregister a component added with component_add(). If the component is bound
799 * into an aggregate driver, this will force the entire aggregate driver, including
800 * all its components, to be unbound.
801 */
802void component_del(struct device *dev, const struct component_ops *ops)
803{
804 struct component *c, *component = NULL;
805
806 mutex_lock(&component_mutex);
807 list_for_each_entry(c, &component_list, node)
808 if (c->dev == dev && c->ops == ops) {
809 list_del(&c->node);
810 component = c;
811 break;
812 }
813
814 if (component && component->adev) {
815 take_down_aggregate_device(component->adev);
816 remove_component(component->adev, component);
817 }
818
819 mutex_unlock(&component_mutex);
820
821 WARN_ON(!component);
822 kfree(component);
823}
824EXPORT_SYMBOL_GPL(component_del);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Componentized device handling.
4 *
5 * This is work in progress. We gather up the component devices into a list,
6 * and bind them when instructed. At the moment, we're specific to the DRM
7 * subsystem, and only handles one master device, but this doesn't have to be
8 * the case.
9 */
10#include <linux/component.h>
11#include <linux/device.h>
12#include <linux/kref.h>
13#include <linux/list.h>
14#include <linux/module.h>
15#include <linux/mutex.h>
16#include <linux/slab.h>
17#include <linux/debugfs.h>
18
19struct component;
20
21struct component_match_array {
22 void *data;
23 int (*compare)(struct device *, void *);
24 void (*release)(struct device *, void *);
25 struct component *component;
26 bool duplicate;
27};
28
29struct component_match {
30 size_t alloc;
31 size_t num;
32 struct component_match_array *compare;
33};
34
35struct master {
36 struct list_head node;
37 bool bound;
38
39 const struct component_master_ops *ops;
40 struct device *dev;
41 struct component_match *match;
42 struct dentry *dentry;
43};
44
45struct component {
46 struct list_head node;
47 struct master *master;
48 bool bound;
49
50 const struct component_ops *ops;
51 struct device *dev;
52};
53
54static DEFINE_MUTEX(component_mutex);
55static LIST_HEAD(component_list);
56static LIST_HEAD(masters);
57
58#ifdef CONFIG_DEBUG_FS
59
60static struct dentry *component_debugfs_dir;
61
62static int component_devices_show(struct seq_file *s, void *data)
63{
64 struct master *m = s->private;
65 struct component_match *match = m->match;
66 size_t i;
67
68 mutex_lock(&component_mutex);
69 seq_printf(s, "%-40s %20s\n", "master name", "status");
70 seq_puts(s, "-------------------------------------------------------------\n");
71 seq_printf(s, "%-40s %20s\n\n",
72 dev_name(m->dev), m->bound ? "bound" : "not bound");
73
74 seq_printf(s, "%-40s %20s\n", "device name", "status");
75 seq_puts(s, "-------------------------------------------------------------\n");
76 for (i = 0; i < match->num; i++) {
77 struct device *d = (struct device *)match->compare[i].data;
78
79 seq_printf(s, "%-40s %20s\n", dev_name(d),
80 match->compare[i].component ?
81 "registered" : "not registered");
82 }
83 mutex_unlock(&component_mutex);
84
85 return 0;
86}
87
88static int component_devices_open(struct inode *inode, struct file *file)
89{
90 return single_open(file, component_devices_show, inode->i_private);
91}
92
93static const struct file_operations component_devices_fops = {
94 .open = component_devices_open,
95 .read = seq_read,
96 .llseek = seq_lseek,
97 .release = single_release,
98};
99
100static int __init component_debug_init(void)
101{
102 component_debugfs_dir = debugfs_create_dir("device_component", NULL);
103
104 return 0;
105}
106
107core_initcall(component_debug_init);
108
109static void component_master_debugfs_add(struct master *m)
110{
111 m->dentry = debugfs_create_file(dev_name(m->dev), 0444,
112 component_debugfs_dir,
113 m, &component_devices_fops);
114}
115
116static void component_master_debugfs_del(struct master *m)
117{
118 debugfs_remove(m->dentry);
119 m->dentry = NULL;
120}
121
122#else
123
124static void component_master_debugfs_add(struct master *m)
125{ }
126
127static void component_master_debugfs_del(struct master *m)
128{ }
129
130#endif
131
132static struct master *__master_find(struct device *dev,
133 const struct component_master_ops *ops)
134{
135 struct master *m;
136
137 list_for_each_entry(m, &masters, node)
138 if (m->dev == dev && (!ops || m->ops == ops))
139 return m;
140
141 return NULL;
142}
143
144static struct component *find_component(struct master *master,
145 int (*compare)(struct device *, void *), void *compare_data)
146{
147 struct component *c;
148
149 list_for_each_entry(c, &component_list, node) {
150 if (c->master && c->master != master)
151 continue;
152
153 if (compare(c->dev, compare_data))
154 return c;
155 }
156
157 return NULL;
158}
159
160static int find_components(struct master *master)
161{
162 struct component_match *match = master->match;
163 size_t i;
164 int ret = 0;
165
166 /*
167 * Scan the array of match functions and attach
168 * any components which are found to this master.
169 */
170 for (i = 0; i < match->num; i++) {
171 struct component_match_array *mc = &match->compare[i];
172 struct component *c;
173
174 dev_dbg(master->dev, "Looking for component %zu\n", i);
175
176 if (match->compare[i].component)
177 continue;
178
179 c = find_component(master, mc->compare, mc->data);
180 if (!c) {
181 ret = -ENXIO;
182 break;
183 }
184
185 dev_dbg(master->dev, "found component %s, duplicate %u\n", dev_name(c->dev), !!c->master);
186
187 /* Attach this component to the master */
188 match->compare[i].duplicate = !!c->master;
189 match->compare[i].component = c;
190 c->master = master;
191 }
192 return ret;
193}
194
195/* Detach component from associated master */
196static void remove_component(struct master *master, struct component *c)
197{
198 size_t i;
199
200 /* Detach the component from this master. */
201 for (i = 0; i < master->match->num; i++)
202 if (master->match->compare[i].component == c)
203 master->match->compare[i].component = NULL;
204}
205
206/*
207 * Try to bring up a master. If component is NULL, we're interested in
208 * this master, otherwise it's a component which must be present to try
209 * and bring up the master.
210 *
211 * Returns 1 for successful bringup, 0 if not ready, or -ve errno.
212 */
213static int try_to_bring_up_master(struct master *master,
214 struct component *component)
215{
216 int ret;
217
218 dev_dbg(master->dev, "trying to bring up master\n");
219
220 if (find_components(master)) {
221 dev_dbg(master->dev, "master has incomplete components\n");
222 return 0;
223 }
224
225 if (component && component->master != master) {
226 dev_dbg(master->dev, "master is not for this component (%s)\n",
227 dev_name(component->dev));
228 return 0;
229 }
230
231 if (!devres_open_group(master->dev, NULL, GFP_KERNEL))
232 return -ENOMEM;
233
234 /* Found all components */
235 ret = master->ops->bind(master->dev);
236 if (ret < 0) {
237 devres_release_group(master->dev, NULL);
238 dev_info(master->dev, "master bind failed: %d\n", ret);
239 return ret;
240 }
241
242 master->bound = true;
243 return 1;
244}
245
246static int try_to_bring_up_masters(struct component *component)
247{
248 struct master *m;
249 int ret = 0;
250
251 list_for_each_entry(m, &masters, node) {
252 if (!m->bound) {
253 ret = try_to_bring_up_master(m, component);
254 if (ret != 0)
255 break;
256 }
257 }
258
259 return ret;
260}
261
262static void take_down_master(struct master *master)
263{
264 if (master->bound) {
265 master->ops->unbind(master->dev);
266 devres_release_group(master->dev, NULL);
267 master->bound = false;
268 }
269}
270
271static void component_match_release(struct device *master,
272 struct component_match *match)
273{
274 unsigned int i;
275
276 for (i = 0; i < match->num; i++) {
277 struct component_match_array *mc = &match->compare[i];
278
279 if (mc->release)
280 mc->release(master, mc->data);
281 }
282
283 kfree(match->compare);
284}
285
286static void devm_component_match_release(struct device *dev, void *res)
287{
288 component_match_release(dev, res);
289}
290
291static int component_match_realloc(struct device *dev,
292 struct component_match *match, size_t num)
293{
294 struct component_match_array *new;
295
296 if (match->alloc == num)
297 return 0;
298
299 new = kmalloc_array(num, sizeof(*new), GFP_KERNEL);
300 if (!new)
301 return -ENOMEM;
302
303 if (match->compare) {
304 memcpy(new, match->compare, sizeof(*new) *
305 min(match->num, num));
306 kfree(match->compare);
307 }
308 match->compare = new;
309 match->alloc = num;
310
311 return 0;
312}
313
314/*
315 * Add a component to be matched, with a release function.
316 *
317 * The match array is first created or extended if necessary.
318 */
319void component_match_add_release(struct device *master,
320 struct component_match **matchptr,
321 void (*release)(struct device *, void *),
322 int (*compare)(struct device *, void *), void *compare_data)
323{
324 struct component_match *match = *matchptr;
325
326 if (IS_ERR(match))
327 return;
328
329 if (!match) {
330 match = devres_alloc(devm_component_match_release,
331 sizeof(*match), GFP_KERNEL);
332 if (!match) {
333 *matchptr = ERR_PTR(-ENOMEM);
334 return;
335 }
336
337 devres_add(master, match);
338
339 *matchptr = match;
340 }
341
342 if (match->num == match->alloc) {
343 size_t new_size = match->alloc + 16;
344 int ret;
345
346 ret = component_match_realloc(master, match, new_size);
347 if (ret) {
348 *matchptr = ERR_PTR(ret);
349 return;
350 }
351 }
352
353 match->compare[match->num].compare = compare;
354 match->compare[match->num].release = release;
355 match->compare[match->num].data = compare_data;
356 match->compare[match->num].component = NULL;
357 match->num++;
358}
359EXPORT_SYMBOL(component_match_add_release);
360
361static void free_master(struct master *master)
362{
363 struct component_match *match = master->match;
364 int i;
365
366 component_master_debugfs_del(master);
367 list_del(&master->node);
368
369 if (match) {
370 for (i = 0; i < match->num; i++) {
371 struct component *c = match->compare[i].component;
372 if (c)
373 c->master = NULL;
374 }
375 }
376
377 kfree(master);
378}
379
380int component_master_add_with_match(struct device *dev,
381 const struct component_master_ops *ops,
382 struct component_match *match)
383{
384 struct master *master;
385 int ret;
386
387 /* Reallocate the match array for its true size */
388 ret = component_match_realloc(dev, match, match->num);
389 if (ret)
390 return ret;
391
392 master = kzalloc(sizeof(*master), GFP_KERNEL);
393 if (!master)
394 return -ENOMEM;
395
396 master->dev = dev;
397 master->ops = ops;
398 master->match = match;
399
400 component_master_debugfs_add(master);
401 /* Add to the list of available masters. */
402 mutex_lock(&component_mutex);
403 list_add(&master->node, &masters);
404
405 ret = try_to_bring_up_master(master, NULL);
406
407 if (ret < 0)
408 free_master(master);
409
410 mutex_unlock(&component_mutex);
411
412 return ret < 0 ? ret : 0;
413}
414EXPORT_SYMBOL_GPL(component_master_add_with_match);
415
416void component_master_del(struct device *dev,
417 const struct component_master_ops *ops)
418{
419 struct master *master;
420
421 mutex_lock(&component_mutex);
422 master = __master_find(dev, ops);
423 if (master) {
424 take_down_master(master);
425 free_master(master);
426 }
427 mutex_unlock(&component_mutex);
428}
429EXPORT_SYMBOL_GPL(component_master_del);
430
431static void component_unbind(struct component *component,
432 struct master *master, void *data)
433{
434 WARN_ON(!component->bound);
435
436 component->ops->unbind(component->dev, master->dev, data);
437 component->bound = false;
438
439 /* Release all resources claimed in the binding of this component */
440 devres_release_group(component->dev, component);
441}
442
443void component_unbind_all(struct device *master_dev, void *data)
444{
445 struct master *master;
446 struct component *c;
447 size_t i;
448
449 WARN_ON(!mutex_is_locked(&component_mutex));
450
451 master = __master_find(master_dev, NULL);
452 if (!master)
453 return;
454
455 /* Unbind components in reverse order */
456 for (i = master->match->num; i--; )
457 if (!master->match->compare[i].duplicate) {
458 c = master->match->compare[i].component;
459 component_unbind(c, master, data);
460 }
461}
462EXPORT_SYMBOL_GPL(component_unbind_all);
463
464static int component_bind(struct component *component, struct master *master,
465 void *data)
466{
467 int ret;
468
469 /*
470 * Each component initialises inside its own devres group.
471 * This allows us to roll-back a failed component without
472 * affecting anything else.
473 */
474 if (!devres_open_group(master->dev, NULL, GFP_KERNEL))
475 return -ENOMEM;
476
477 /*
478 * Also open a group for the device itself: this allows us
479 * to release the resources claimed against the sub-device
480 * at the appropriate moment.
481 */
482 if (!devres_open_group(component->dev, component, GFP_KERNEL)) {
483 devres_release_group(master->dev, NULL);
484 return -ENOMEM;
485 }
486
487 dev_dbg(master->dev, "binding %s (ops %ps)\n",
488 dev_name(component->dev), component->ops);
489
490 ret = component->ops->bind(component->dev, master->dev, data);
491 if (!ret) {
492 component->bound = true;
493
494 /*
495 * Close the component device's group so that resources
496 * allocated in the binding are encapsulated for removal
497 * at unbind. Remove the group on the DRM device as we
498 * can clean those resources up independently.
499 */
500 devres_close_group(component->dev, NULL);
501 devres_remove_group(master->dev, NULL);
502
503 dev_info(master->dev, "bound %s (ops %ps)\n",
504 dev_name(component->dev), component->ops);
505 } else {
506 devres_release_group(component->dev, NULL);
507 devres_release_group(master->dev, NULL);
508
509 dev_err(master->dev, "failed to bind %s (ops %ps): %d\n",
510 dev_name(component->dev), component->ops, ret);
511 }
512
513 return ret;
514}
515
516int component_bind_all(struct device *master_dev, void *data)
517{
518 struct master *master;
519 struct component *c;
520 size_t i;
521 int ret = 0;
522
523 WARN_ON(!mutex_is_locked(&component_mutex));
524
525 master = __master_find(master_dev, NULL);
526 if (!master)
527 return -EINVAL;
528
529 /* Bind components in match order */
530 for (i = 0; i < master->match->num; i++)
531 if (!master->match->compare[i].duplicate) {
532 c = master->match->compare[i].component;
533 ret = component_bind(c, master, data);
534 if (ret)
535 break;
536 }
537
538 if (ret != 0) {
539 for (; i--; )
540 if (!master->match->compare[i].duplicate) {
541 c = master->match->compare[i].component;
542 component_unbind(c, master, data);
543 }
544 }
545
546 return ret;
547}
548EXPORT_SYMBOL_GPL(component_bind_all);
549
550int component_add(struct device *dev, const struct component_ops *ops)
551{
552 struct component *component;
553 int ret;
554
555 component = kzalloc(sizeof(*component), GFP_KERNEL);
556 if (!component)
557 return -ENOMEM;
558
559 component->ops = ops;
560 component->dev = dev;
561
562 dev_dbg(dev, "adding component (ops %ps)\n", ops);
563
564 mutex_lock(&component_mutex);
565 list_add_tail(&component->node, &component_list);
566
567 ret = try_to_bring_up_masters(component);
568 if (ret < 0) {
569 if (component->master)
570 remove_component(component->master, component);
571 list_del(&component->node);
572
573 kfree(component);
574 }
575 mutex_unlock(&component_mutex);
576
577 return ret < 0 ? ret : 0;
578}
579EXPORT_SYMBOL_GPL(component_add);
580
581void component_del(struct device *dev, const struct component_ops *ops)
582{
583 struct component *c, *component = NULL;
584
585 mutex_lock(&component_mutex);
586 list_for_each_entry(c, &component_list, node)
587 if (c->dev == dev && c->ops == ops) {
588 list_del(&c->node);
589 component = c;
590 break;
591 }
592
593 if (component && component->master) {
594 take_down_master(component->master);
595 remove_component(component->master, component);
596 }
597
598 mutex_unlock(&component_mutex);
599
600 WARN_ON(!component);
601 kfree(component);
602}
603EXPORT_SYMBOL_GPL(component_del);
604
605MODULE_LICENSE("GPL v2");