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9431063a VF |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * dpll_core.c - DPLL subsystem kernel-space interface implementation. | |
4 | * | |
5 | * Copyright (c) 2023 Meta Platforms, Inc. and affiliates | |
6 | * Copyright (c) 2023 Intel Corporation. | |
7 | */ | |
8 | ||
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
10 | ||
11 | #include <linux/device.h> | |
12 | #include <linux/err.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/string.h> | |
15 | ||
16 | #include "dpll_core.h" | |
9d71b54b | 17 | #include "dpll_netlink.h" |
9431063a VF |
18 | |
19 | /* Mutex lock to protect DPLL subsystem devices and pins */ | |
20 | DEFINE_MUTEX(dpll_lock); | |
21 | ||
22 | DEFINE_XARRAY_FLAGS(dpll_device_xa, XA_FLAGS_ALLOC); | |
23 | DEFINE_XARRAY_FLAGS(dpll_pin_xa, XA_FLAGS_ALLOC); | |
24 | ||
97f265ef JP |
25 | static u32 dpll_device_xa_id; |
26 | static u32 dpll_pin_xa_id; | |
9431063a VF |
27 | |
28 | #define ASSERT_DPLL_REGISTERED(d) \ | |
29 | WARN_ON_ONCE(!xa_get_mark(&dpll_device_xa, (d)->id, DPLL_REGISTERED)) | |
30 | #define ASSERT_DPLL_NOT_REGISTERED(d) \ | |
31 | WARN_ON_ONCE(xa_get_mark(&dpll_device_xa, (d)->id, DPLL_REGISTERED)) | |
9431063a VF |
32 | |
33 | struct dpll_device_registration { | |
34 | struct list_head list; | |
35 | const struct dpll_device_ops *ops; | |
36 | void *priv; | |
37 | }; | |
38 | ||
39 | struct dpll_pin_registration { | |
40 | struct list_head list; | |
41 | const struct dpll_pin_ops *ops; | |
42 | void *priv; | |
43 | }; | |
44 | ||
640f41ed ED |
45 | struct dpll_pin *netdev_dpll_pin(const struct net_device *dev) |
46 | { | |
47 | return rcu_dereference_rtnl(dev->dpll_pin); | |
48 | } | |
49 | ||
9431063a VF |
50 | struct dpll_device *dpll_device_get_by_id(int id) |
51 | { | |
52 | if (xa_get_mark(&dpll_device_xa, id, DPLL_REGISTERED)) | |
53 | return xa_load(&dpll_device_xa, id); | |
54 | ||
55 | return NULL; | |
56 | } | |
57 | ||
58 | static struct dpll_pin_registration * | |
59 | dpll_pin_registration_find(struct dpll_pin_ref *ref, | |
60 | const struct dpll_pin_ops *ops, void *priv) | |
61 | { | |
62 | struct dpll_pin_registration *reg; | |
63 | ||
64 | list_for_each_entry(reg, &ref->registration_list, list) { | |
65 | if (reg->ops == ops && reg->priv == priv) | |
66 | return reg; | |
67 | } | |
68 | return NULL; | |
69 | } | |
70 | ||
71 | static int | |
72 | dpll_xa_ref_pin_add(struct xarray *xa_pins, struct dpll_pin *pin, | |
73 | const struct dpll_pin_ops *ops, void *priv) | |
74 | { | |
75 | struct dpll_pin_registration *reg; | |
76 | struct dpll_pin_ref *ref; | |
77 | bool ref_exists = false; | |
78 | unsigned long i; | |
79 | int ret; | |
80 | ||
81 | xa_for_each(xa_pins, i, ref) { | |
82 | if (ref->pin != pin) | |
83 | continue; | |
84 | reg = dpll_pin_registration_find(ref, ops, priv); | |
85 | if (reg) { | |
86 | refcount_inc(&ref->refcount); | |
87 | return 0; | |
88 | } | |
89 | ref_exists = true; | |
90 | break; | |
91 | } | |
92 | ||
93 | if (!ref_exists) { | |
94 | ref = kzalloc(sizeof(*ref), GFP_KERNEL); | |
95 | if (!ref) | |
96 | return -ENOMEM; | |
97 | ref->pin = pin; | |
98 | INIT_LIST_HEAD(&ref->registration_list); | |
99 | ret = xa_insert(xa_pins, pin->pin_idx, ref, GFP_KERNEL); | |
100 | if (ret) { | |
101 | kfree(ref); | |
102 | return ret; | |
103 | } | |
104 | refcount_set(&ref->refcount, 1); | |
105 | } | |
106 | ||
107 | reg = kzalloc(sizeof(*reg), GFP_KERNEL); | |
108 | if (!reg) { | |
109 | if (!ref_exists) { | |
110 | xa_erase(xa_pins, pin->pin_idx); | |
111 | kfree(ref); | |
112 | } | |
113 | return -ENOMEM; | |
114 | } | |
115 | reg->ops = ops; | |
116 | reg->priv = priv; | |
117 | if (ref_exists) | |
118 | refcount_inc(&ref->refcount); | |
119 | list_add_tail(®->list, &ref->registration_list); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | static int dpll_xa_ref_pin_del(struct xarray *xa_pins, struct dpll_pin *pin, | |
125 | const struct dpll_pin_ops *ops, void *priv) | |
126 | { | |
127 | struct dpll_pin_registration *reg; | |
128 | struct dpll_pin_ref *ref; | |
129 | unsigned long i; | |
130 | ||
131 | xa_for_each(xa_pins, i, ref) { | |
132 | if (ref->pin != pin) | |
133 | continue; | |
134 | reg = dpll_pin_registration_find(ref, ops, priv); | |
135 | if (WARN_ON(!reg)) | |
136 | return -EINVAL; | |
137 | if (refcount_dec_and_test(&ref->refcount)) { | |
138 | list_del(®->list); | |
139 | kfree(reg); | |
140 | xa_erase(xa_pins, i); | |
141 | WARN_ON(!list_empty(&ref->registration_list)); | |
142 | kfree(ref); | |
143 | } | |
144 | return 0; | |
145 | } | |
146 | ||
147 | return -EINVAL; | |
148 | } | |
149 | ||
150 | static int | |
151 | dpll_xa_ref_dpll_add(struct xarray *xa_dplls, struct dpll_device *dpll, | |
152 | const struct dpll_pin_ops *ops, void *priv) | |
153 | { | |
154 | struct dpll_pin_registration *reg; | |
155 | struct dpll_pin_ref *ref; | |
156 | bool ref_exists = false; | |
157 | unsigned long i; | |
158 | int ret; | |
159 | ||
160 | xa_for_each(xa_dplls, i, ref) { | |
161 | if (ref->dpll != dpll) | |
162 | continue; | |
163 | reg = dpll_pin_registration_find(ref, ops, priv); | |
164 | if (reg) { | |
165 | refcount_inc(&ref->refcount); | |
166 | return 0; | |
167 | } | |
168 | ref_exists = true; | |
169 | break; | |
170 | } | |
171 | ||
172 | if (!ref_exists) { | |
173 | ref = kzalloc(sizeof(*ref), GFP_KERNEL); | |
174 | if (!ref) | |
175 | return -ENOMEM; | |
176 | ref->dpll = dpll; | |
177 | INIT_LIST_HEAD(&ref->registration_list); | |
178 | ret = xa_insert(xa_dplls, dpll->id, ref, GFP_KERNEL); | |
179 | if (ret) { | |
180 | kfree(ref); | |
181 | return ret; | |
182 | } | |
183 | refcount_set(&ref->refcount, 1); | |
184 | } | |
185 | ||
186 | reg = kzalloc(sizeof(*reg), GFP_KERNEL); | |
187 | if (!reg) { | |
188 | if (!ref_exists) { | |
189 | xa_erase(xa_dplls, dpll->id); | |
190 | kfree(ref); | |
191 | } | |
192 | return -ENOMEM; | |
193 | } | |
194 | reg->ops = ops; | |
195 | reg->priv = priv; | |
196 | if (ref_exists) | |
197 | refcount_inc(&ref->refcount); | |
198 | list_add_tail(®->list, &ref->registration_list); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static void | |
204 | dpll_xa_ref_dpll_del(struct xarray *xa_dplls, struct dpll_device *dpll, | |
205 | const struct dpll_pin_ops *ops, void *priv) | |
206 | { | |
207 | struct dpll_pin_registration *reg; | |
208 | struct dpll_pin_ref *ref; | |
209 | unsigned long i; | |
210 | ||
211 | xa_for_each(xa_dplls, i, ref) { | |
212 | if (ref->dpll != dpll) | |
213 | continue; | |
214 | reg = dpll_pin_registration_find(ref, ops, priv); | |
215 | if (WARN_ON(!reg)) | |
216 | return; | |
217 | if (refcount_dec_and_test(&ref->refcount)) { | |
218 | list_del(®->list); | |
219 | kfree(reg); | |
220 | xa_erase(xa_dplls, i); | |
221 | WARN_ON(!list_empty(&ref->registration_list)); | |
222 | kfree(ref); | |
223 | } | |
224 | return; | |
225 | } | |
226 | } | |
227 | ||
228 | struct dpll_pin_ref *dpll_xa_ref_dpll_first(struct xarray *xa_refs) | |
229 | { | |
230 | struct dpll_pin_ref *ref; | |
231 | unsigned long i = 0; | |
232 | ||
233 | ref = xa_find(xa_refs, &i, ULONG_MAX, XA_PRESENT); | |
234 | WARN_ON(!ref); | |
235 | return ref; | |
236 | } | |
237 | ||
238 | static struct dpll_device * | |
239 | dpll_device_alloc(const u64 clock_id, u32 device_idx, struct module *module) | |
240 | { | |
241 | struct dpll_device *dpll; | |
242 | int ret; | |
243 | ||
244 | dpll = kzalloc(sizeof(*dpll), GFP_KERNEL); | |
245 | if (!dpll) | |
246 | return ERR_PTR(-ENOMEM); | |
247 | refcount_set(&dpll->refcount, 1); | |
248 | INIT_LIST_HEAD(&dpll->registration_list); | |
249 | dpll->device_idx = device_idx; | |
250 | dpll->clock_id = clock_id; | |
251 | dpll->module = module; | |
252 | ret = xa_alloc_cyclic(&dpll_device_xa, &dpll->id, dpll, xa_limit_32b, | |
97f265ef | 253 | &dpll_device_xa_id, GFP_KERNEL); |
9431063a VF |
254 | if (ret < 0) { |
255 | kfree(dpll); | |
256 | return ERR_PTR(ret); | |
257 | } | |
258 | xa_init_flags(&dpll->pin_refs, XA_FLAGS_ALLOC); | |
259 | ||
260 | return dpll; | |
261 | } | |
262 | ||
263 | /** | |
264 | * dpll_device_get - find existing or create new dpll device | |
265 | * @clock_id: clock_id of creator | |
266 | * @device_idx: idx given by device driver | |
267 | * @module: reference to registering module | |
268 | * | |
269 | * Get existing object of a dpll device, unique for given arguments. | |
270 | * Create new if doesn't exist yet. | |
271 | * | |
272 | * Context: Acquires a lock (dpll_lock) | |
273 | * Return: | |
274 | * * valid dpll_device struct pointer if succeeded | |
275 | * * ERR_PTR(X) - error | |
276 | */ | |
277 | struct dpll_device * | |
278 | dpll_device_get(u64 clock_id, u32 device_idx, struct module *module) | |
279 | { | |
280 | struct dpll_device *dpll, *ret = NULL; | |
281 | unsigned long index; | |
282 | ||
283 | mutex_lock(&dpll_lock); | |
284 | xa_for_each(&dpll_device_xa, index, dpll) { | |
285 | if (dpll->clock_id == clock_id && | |
286 | dpll->device_idx == device_idx && | |
287 | dpll->module == module) { | |
288 | ret = dpll; | |
289 | refcount_inc(&ret->refcount); | |
290 | break; | |
291 | } | |
292 | } | |
293 | if (!ret) | |
294 | ret = dpll_device_alloc(clock_id, device_idx, module); | |
295 | mutex_unlock(&dpll_lock); | |
296 | ||
297 | return ret; | |
298 | } | |
299 | EXPORT_SYMBOL_GPL(dpll_device_get); | |
300 | ||
301 | /** | |
302 | * dpll_device_put - decrease the refcount and free memory if possible | |
303 | * @dpll: dpll_device struct pointer | |
304 | * | |
305 | * Context: Acquires a lock (dpll_lock) | |
306 | * Drop reference for a dpll device, if all references are gone, delete | |
307 | * dpll device object. | |
308 | */ | |
309 | void dpll_device_put(struct dpll_device *dpll) | |
310 | { | |
311 | mutex_lock(&dpll_lock); | |
312 | if (refcount_dec_and_test(&dpll->refcount)) { | |
313 | ASSERT_DPLL_NOT_REGISTERED(dpll); | |
314 | WARN_ON_ONCE(!xa_empty(&dpll->pin_refs)); | |
315 | xa_destroy(&dpll->pin_refs); | |
316 | xa_erase(&dpll_device_xa, dpll->id); | |
317 | WARN_ON(!list_empty(&dpll->registration_list)); | |
318 | kfree(dpll); | |
319 | } | |
320 | mutex_unlock(&dpll_lock); | |
321 | } | |
322 | EXPORT_SYMBOL_GPL(dpll_device_put); | |
323 | ||
324 | static struct dpll_device_registration * | |
325 | dpll_device_registration_find(struct dpll_device *dpll, | |
326 | const struct dpll_device_ops *ops, void *priv) | |
327 | { | |
328 | struct dpll_device_registration *reg; | |
329 | ||
330 | list_for_each_entry(reg, &dpll->registration_list, list) { | |
331 | if (reg->ops == ops && reg->priv == priv) | |
332 | return reg; | |
333 | } | |
334 | return NULL; | |
335 | } | |
336 | ||
337 | /** | |
338 | * dpll_device_register - register the dpll device in the subsystem | |
339 | * @dpll: pointer to a dpll | |
340 | * @type: type of a dpll | |
341 | * @ops: ops for a dpll device | |
342 | * @priv: pointer to private information of owner | |
343 | * | |
344 | * Make dpll device available for user space. | |
345 | * | |
346 | * Context: Acquires a lock (dpll_lock) | |
347 | * Return: | |
348 | * * 0 on success | |
349 | * * negative - error value | |
350 | */ | |
351 | int dpll_device_register(struct dpll_device *dpll, enum dpll_type type, | |
352 | const struct dpll_device_ops *ops, void *priv) | |
353 | { | |
354 | struct dpll_device_registration *reg; | |
355 | bool first_registration = false; | |
356 | ||
357 | if (WARN_ON(!ops)) | |
358 | return -EINVAL; | |
359 | if (WARN_ON(!ops->mode_get)) | |
360 | return -EINVAL; | |
361 | if (WARN_ON(!ops->lock_status_get)) | |
362 | return -EINVAL; | |
363 | if (WARN_ON(type < DPLL_TYPE_PPS || type > DPLL_TYPE_MAX)) | |
364 | return -EINVAL; | |
365 | ||
366 | mutex_lock(&dpll_lock); | |
367 | reg = dpll_device_registration_find(dpll, ops, priv); | |
368 | if (reg) { | |
369 | mutex_unlock(&dpll_lock); | |
370 | return -EEXIST; | |
371 | } | |
372 | ||
373 | reg = kzalloc(sizeof(*reg), GFP_KERNEL); | |
374 | if (!reg) { | |
375 | mutex_unlock(&dpll_lock); | |
376 | return -ENOMEM; | |
377 | } | |
378 | reg->ops = ops; | |
379 | reg->priv = priv; | |
380 | dpll->type = type; | |
381 | first_registration = list_empty(&dpll->registration_list); | |
382 | list_add_tail(®->list, &dpll->registration_list); | |
383 | if (!first_registration) { | |
384 | mutex_unlock(&dpll_lock); | |
385 | return 0; | |
386 | } | |
387 | ||
388 | xa_set_mark(&dpll_device_xa, dpll->id, DPLL_REGISTERED); | |
9d71b54b | 389 | dpll_device_create_ntf(dpll); |
9431063a VF |
390 | mutex_unlock(&dpll_lock); |
391 | ||
392 | return 0; | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(dpll_device_register); | |
395 | ||
396 | /** | |
397 | * dpll_device_unregister - unregister dpll device | |
398 | * @dpll: registered dpll pointer | |
399 | * @ops: ops for a dpll device | |
400 | * @priv: pointer to private information of owner | |
401 | * | |
402 | * Unregister device, make it unavailable for userspace. | |
403 | * Note: It does not free the memory | |
404 | * Context: Acquires a lock (dpll_lock) | |
405 | */ | |
406 | void dpll_device_unregister(struct dpll_device *dpll, | |
407 | const struct dpll_device_ops *ops, void *priv) | |
408 | { | |
409 | struct dpll_device_registration *reg; | |
410 | ||
411 | mutex_lock(&dpll_lock); | |
412 | ASSERT_DPLL_REGISTERED(dpll); | |
9d71b54b | 413 | dpll_device_delete_ntf(dpll); |
9431063a VF |
414 | reg = dpll_device_registration_find(dpll, ops, priv); |
415 | if (WARN_ON(!reg)) { | |
416 | mutex_unlock(&dpll_lock); | |
417 | return; | |
418 | } | |
419 | list_del(®->list); | |
420 | kfree(reg); | |
421 | ||
422 | if (!list_empty(&dpll->registration_list)) { | |
423 | mutex_unlock(&dpll_lock); | |
424 | return; | |
425 | } | |
426 | xa_clear_mark(&dpll_device_xa, dpll->id, DPLL_REGISTERED); | |
427 | mutex_unlock(&dpll_lock); | |
428 | } | |
429 | EXPORT_SYMBOL_GPL(dpll_device_unregister); | |
430 | ||
830ead5f AK |
431 | static void dpll_pin_prop_free(struct dpll_pin_properties *prop) |
432 | { | |
433 | kfree(prop->package_label); | |
434 | kfree(prop->panel_label); | |
435 | kfree(prop->board_label); | |
436 | kfree(prop->freq_supported); | |
437 | } | |
438 | ||
439 | static int dpll_pin_prop_dup(const struct dpll_pin_properties *src, | |
440 | struct dpll_pin_properties *dst) | |
441 | { | |
442 | memcpy(dst, src, sizeof(*dst)); | |
443 | if (src->freq_supported && src->freq_supported_num) { | |
444 | size_t freq_size = src->freq_supported_num * | |
445 | sizeof(*src->freq_supported); | |
446 | dst->freq_supported = kmemdup(src->freq_supported, | |
447 | freq_size, GFP_KERNEL); | |
448 | if (!src->freq_supported) | |
449 | return -ENOMEM; | |
450 | } | |
451 | if (src->board_label) { | |
452 | dst->board_label = kstrdup(src->board_label, GFP_KERNEL); | |
453 | if (!dst->board_label) | |
454 | goto err_board_label; | |
455 | } | |
456 | if (src->panel_label) { | |
457 | dst->panel_label = kstrdup(src->panel_label, GFP_KERNEL); | |
458 | if (!dst->panel_label) | |
459 | goto err_panel_label; | |
460 | } | |
461 | if (src->package_label) { | |
462 | dst->package_label = kstrdup(src->package_label, GFP_KERNEL); | |
463 | if (!dst->package_label) | |
464 | goto err_package_label; | |
465 | } | |
466 | ||
467 | return 0; | |
468 | ||
469 | err_package_label: | |
470 | kfree(dst->panel_label); | |
471 | err_panel_label: | |
472 | kfree(dst->board_label); | |
473 | err_board_label: | |
474 | kfree(dst->freq_supported); | |
475 | return -ENOMEM; | |
476 | } | |
477 | ||
9431063a VF |
478 | static struct dpll_pin * |
479 | dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module, | |
480 | const struct dpll_pin_properties *prop) | |
481 | { | |
482 | struct dpll_pin *pin; | |
483 | int ret; | |
484 | ||
485 | pin = kzalloc(sizeof(*pin), GFP_KERNEL); | |
486 | if (!pin) | |
487 | return ERR_PTR(-ENOMEM); | |
488 | pin->pin_idx = pin_idx; | |
489 | pin->clock_id = clock_id; | |
490 | pin->module = module; | |
491 | if (WARN_ON(prop->type < DPLL_PIN_TYPE_MUX || | |
492 | prop->type > DPLL_PIN_TYPE_MAX)) { | |
493 | ret = -EINVAL; | |
b6a11a7f | 494 | goto err_pin_prop; |
9431063a | 495 | } |
830ead5f AK |
496 | ret = dpll_pin_prop_dup(prop, &pin->prop); |
497 | if (ret) | |
498 | goto err_pin_prop; | |
9431063a VF |
499 | refcount_set(&pin->refcount, 1); |
500 | xa_init_flags(&pin->dpll_refs, XA_FLAGS_ALLOC); | |
501 | xa_init_flags(&pin->parent_refs, XA_FLAGS_ALLOC); | |
97f265ef JP |
502 | ret = xa_alloc_cyclic(&dpll_pin_xa, &pin->id, pin, xa_limit_32b, |
503 | &dpll_pin_xa_id, GFP_KERNEL); | |
9431063a | 504 | if (ret) |
b6a11a7f | 505 | goto err_xa_alloc; |
9431063a | 506 | return pin; |
b6a11a7f | 507 | err_xa_alloc: |
9431063a VF |
508 | xa_destroy(&pin->dpll_refs); |
509 | xa_destroy(&pin->parent_refs); | |
830ead5f | 510 | dpll_pin_prop_free(&pin->prop); |
b6a11a7f | 511 | err_pin_prop: |
9431063a VF |
512 | kfree(pin); |
513 | return ERR_PTR(ret); | |
514 | } | |
515 | ||
516 | /** | |
517 | * dpll_pin_get - find existing or create new dpll pin | |
518 | * @clock_id: clock_id of creator | |
519 | * @pin_idx: idx given by dev driver | |
520 | * @module: reference to registering module | |
521 | * @prop: dpll pin properties | |
522 | * | |
523 | * Get existing object of a pin (unique for given arguments) or create new | |
524 | * if doesn't exist yet. | |
525 | * | |
526 | * Context: Acquires a lock (dpll_lock) | |
527 | * Return: | |
528 | * * valid allocated dpll_pin struct pointer if succeeded | |
529 | * * ERR_PTR(X) - error | |
530 | */ | |
531 | struct dpll_pin * | |
532 | dpll_pin_get(u64 clock_id, u32 pin_idx, struct module *module, | |
533 | const struct dpll_pin_properties *prop) | |
534 | { | |
535 | struct dpll_pin *pos, *ret = NULL; | |
536 | unsigned long i; | |
537 | ||
538 | mutex_lock(&dpll_lock); | |
539 | xa_for_each(&dpll_pin_xa, i, pos) { | |
540 | if (pos->clock_id == clock_id && | |
541 | pos->pin_idx == pin_idx && | |
542 | pos->module == module) { | |
543 | ret = pos; | |
544 | refcount_inc(&ret->refcount); | |
545 | break; | |
546 | } | |
547 | } | |
548 | if (!ret) | |
549 | ret = dpll_pin_alloc(clock_id, pin_idx, module, prop); | |
550 | mutex_unlock(&dpll_lock); | |
551 | ||
552 | return ret; | |
553 | } | |
554 | EXPORT_SYMBOL_GPL(dpll_pin_get); | |
555 | ||
556 | /** | |
557 | * dpll_pin_put - decrease the refcount and free memory if possible | |
558 | * @pin: pointer to a pin to be put | |
559 | * | |
560 | * Drop reference for a pin, if all references are gone, delete pin object. | |
561 | * | |
562 | * Context: Acquires a lock (dpll_lock) | |
563 | */ | |
564 | void dpll_pin_put(struct dpll_pin *pin) | |
565 | { | |
566 | mutex_lock(&dpll_lock); | |
567 | if (refcount_dec_and_test(&pin->refcount)) { | |
568 | xa_destroy(&pin->dpll_refs); | |
569 | xa_destroy(&pin->parent_refs); | |
570 | xa_erase(&dpll_pin_xa, pin->id); | |
830ead5f | 571 | dpll_pin_prop_free(&pin->prop); |
0d60d8df | 572 | kfree_rcu(pin, rcu); |
9431063a VF |
573 | } |
574 | mutex_unlock(&dpll_lock); | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(dpll_pin_put); | |
577 | ||
578 | static int | |
579 | __dpll_pin_register(struct dpll_device *dpll, struct dpll_pin *pin, | |
580 | const struct dpll_pin_ops *ops, void *priv) | |
581 | { | |
582 | int ret; | |
583 | ||
584 | ret = dpll_xa_ref_pin_add(&dpll->pin_refs, pin, ops, priv); | |
585 | if (ret) | |
586 | return ret; | |
587 | ret = dpll_xa_ref_dpll_add(&pin->dpll_refs, dpll, ops, priv); | |
588 | if (ret) | |
589 | goto ref_pin_del; | |
590 | xa_set_mark(&dpll_pin_xa, pin->id, DPLL_REGISTERED); | |
9d71b54b | 591 | dpll_pin_create_ntf(pin); |
9431063a VF |
592 | |
593 | return ret; | |
594 | ||
595 | ref_pin_del: | |
596 | dpll_xa_ref_pin_del(&dpll->pin_refs, pin, ops, priv); | |
597 | return ret; | |
598 | } | |
599 | ||
600 | /** | |
601 | * dpll_pin_register - register the dpll pin in the subsystem | |
602 | * @dpll: pointer to a dpll | |
603 | * @pin: pointer to a dpll pin | |
604 | * @ops: ops for a dpll pin ops | |
605 | * @priv: pointer to private information of owner | |
606 | * | |
607 | * Context: Acquires a lock (dpll_lock) | |
608 | * Return: | |
609 | * * 0 on success | |
610 | * * negative - error value | |
611 | */ | |
612 | int | |
613 | dpll_pin_register(struct dpll_device *dpll, struct dpll_pin *pin, | |
614 | const struct dpll_pin_ops *ops, void *priv) | |
615 | { | |
616 | int ret; | |
617 | ||
618 | if (WARN_ON(!ops) || | |
619 | WARN_ON(!ops->state_on_dpll_get) || | |
620 | WARN_ON(!ops->direction_get)) | |
621 | return -EINVAL; | |
9431063a VF |
622 | |
623 | mutex_lock(&dpll_lock); | |
624 | if (WARN_ON(!(dpll->module == pin->module && | |
625 | dpll->clock_id == pin->clock_id))) | |
626 | ret = -EINVAL; | |
627 | else | |
628 | ret = __dpll_pin_register(dpll, pin, ops, priv); | |
629 | mutex_unlock(&dpll_lock); | |
630 | ||
631 | return ret; | |
632 | } | |
633 | EXPORT_SYMBOL_GPL(dpll_pin_register); | |
634 | ||
635 | static void | |
636 | __dpll_pin_unregister(struct dpll_device *dpll, struct dpll_pin *pin, | |
637 | const struct dpll_pin_ops *ops, void *priv) | |
638 | { | |
639 | dpll_xa_ref_pin_del(&dpll->pin_refs, pin, ops, priv); | |
640 | dpll_xa_ref_dpll_del(&pin->dpll_refs, dpll, ops, priv); | |
641 | if (xa_empty(&pin->dpll_refs)) | |
642 | xa_clear_mark(&dpll_pin_xa, pin->id, DPLL_REGISTERED); | |
643 | } | |
644 | ||
645 | /** | |
646 | * dpll_pin_unregister - unregister dpll pin from dpll device | |
647 | * @dpll: registered dpll pointer | |
648 | * @pin: pointer to a pin | |
649 | * @ops: ops for a dpll pin | |
650 | * @priv: pointer to private information of owner | |
651 | * | |
652 | * Note: It does not free the memory | |
653 | * Context: Acquires a lock (dpll_lock) | |
654 | */ | |
655 | void dpll_pin_unregister(struct dpll_device *dpll, struct dpll_pin *pin, | |
656 | const struct dpll_pin_ops *ops, void *priv) | |
657 | { | |
658 | if (WARN_ON(xa_empty(&dpll->pin_refs))) | |
659 | return; | |
660 | if (WARN_ON(!xa_empty(&pin->parent_refs))) | |
661 | return; | |
662 | ||
663 | mutex_lock(&dpll_lock); | |
9d71b54b | 664 | dpll_pin_delete_ntf(pin); |
9431063a VF |
665 | __dpll_pin_unregister(dpll, pin, ops, priv); |
666 | mutex_unlock(&dpll_lock); | |
667 | } | |
668 | EXPORT_SYMBOL_GPL(dpll_pin_unregister); | |
669 | ||
670 | /** | |
671 | * dpll_pin_on_pin_register - register a pin with a parent pin | |
672 | * @parent: pointer to a parent pin | |
673 | * @pin: pointer to a pin | |
674 | * @ops: ops for a dpll pin | |
675 | * @priv: pointer to private information of owner | |
676 | * | |
677 | * Register a pin with a parent pin, create references between them and | |
678 | * between newly registered pin and dplls connected with a parent pin. | |
679 | * | |
680 | * Context: Acquires a lock (dpll_lock) | |
681 | * Return: | |
682 | * * 0 on success | |
683 | * * negative - error value | |
684 | */ | |
685 | int dpll_pin_on_pin_register(struct dpll_pin *parent, struct dpll_pin *pin, | |
686 | const struct dpll_pin_ops *ops, void *priv) | |
687 | { | |
688 | struct dpll_pin_ref *ref; | |
689 | unsigned long i, stop; | |
690 | int ret; | |
691 | ||
830ead5f | 692 | if (WARN_ON(parent->prop.type != DPLL_PIN_TYPE_MUX)) |
9431063a VF |
693 | return -EINVAL; |
694 | ||
695 | if (WARN_ON(!ops) || | |
696 | WARN_ON(!ops->state_on_pin_get) || | |
697 | WARN_ON(!ops->direction_get)) | |
698 | return -EINVAL; | |
9431063a VF |
699 | |
700 | mutex_lock(&dpll_lock); | |
701 | ret = dpll_xa_ref_pin_add(&pin->parent_refs, parent, ops, priv); | |
702 | if (ret) | |
703 | goto unlock; | |
704 | refcount_inc(&pin->refcount); | |
705 | xa_for_each(&parent->dpll_refs, i, ref) { | |
706 | ret = __dpll_pin_register(ref->dpll, pin, ops, priv); | |
707 | if (ret) { | |
708 | stop = i; | |
709 | goto dpll_unregister; | |
710 | } | |
9d71b54b | 711 | dpll_pin_create_ntf(pin); |
9431063a VF |
712 | } |
713 | mutex_unlock(&dpll_lock); | |
714 | ||
715 | return ret; | |
716 | ||
717 | dpll_unregister: | |
718 | xa_for_each(&parent->dpll_refs, i, ref) | |
9d71b54b | 719 | if (i < stop) { |
9431063a | 720 | __dpll_pin_unregister(ref->dpll, pin, ops, priv); |
9d71b54b VF |
721 | dpll_pin_delete_ntf(pin); |
722 | } | |
9431063a VF |
723 | refcount_dec(&pin->refcount); |
724 | dpll_xa_ref_pin_del(&pin->parent_refs, parent, ops, priv); | |
725 | unlock: | |
726 | mutex_unlock(&dpll_lock); | |
727 | return ret; | |
728 | } | |
729 | EXPORT_SYMBOL_GPL(dpll_pin_on_pin_register); | |
730 | ||
731 | /** | |
732 | * dpll_pin_on_pin_unregister - unregister dpll pin from a parent pin | |
733 | * @parent: pointer to a parent pin | |
734 | * @pin: pointer to a pin | |
735 | * @ops: ops for a dpll pin | |
736 | * @priv: pointer to private information of owner | |
737 | * | |
738 | * Context: Acquires a lock (dpll_lock) | |
739 | * Note: It does not free the memory | |
740 | */ | |
741 | void dpll_pin_on_pin_unregister(struct dpll_pin *parent, struct dpll_pin *pin, | |
742 | const struct dpll_pin_ops *ops, void *priv) | |
743 | { | |
744 | struct dpll_pin_ref *ref; | |
745 | unsigned long i; | |
746 | ||
747 | mutex_lock(&dpll_lock); | |
9d71b54b | 748 | dpll_pin_delete_ntf(pin); |
9431063a VF |
749 | dpll_xa_ref_pin_del(&pin->parent_refs, parent, ops, priv); |
750 | refcount_dec(&pin->refcount); | |
751 | xa_for_each(&pin->dpll_refs, i, ref) | |
752 | __dpll_pin_unregister(ref->dpll, pin, ops, priv); | |
753 | mutex_unlock(&dpll_lock); | |
754 | } | |
755 | EXPORT_SYMBOL_GPL(dpll_pin_on_pin_unregister); | |
756 | ||
757 | static struct dpll_device_registration * | |
758 | dpll_device_registration_first(struct dpll_device *dpll) | |
759 | { | |
760 | struct dpll_device_registration *reg; | |
761 | ||
762 | reg = list_first_entry_or_null((struct list_head *)&dpll->registration_list, | |
763 | struct dpll_device_registration, list); | |
764 | WARN_ON(!reg); | |
765 | return reg; | |
766 | } | |
767 | ||
768 | void *dpll_priv(struct dpll_device *dpll) | |
769 | { | |
770 | struct dpll_device_registration *reg; | |
771 | ||
772 | reg = dpll_device_registration_first(dpll); | |
773 | return reg->priv; | |
774 | } | |
775 | ||
776 | const struct dpll_device_ops *dpll_device_ops(struct dpll_device *dpll) | |
777 | { | |
778 | struct dpll_device_registration *reg; | |
779 | ||
780 | reg = dpll_device_registration_first(dpll); | |
781 | return reg->ops; | |
782 | } | |
783 | ||
784 | static struct dpll_pin_registration * | |
785 | dpll_pin_registration_first(struct dpll_pin_ref *ref) | |
786 | { | |
787 | struct dpll_pin_registration *reg; | |
788 | ||
789 | reg = list_first_entry_or_null(&ref->registration_list, | |
790 | struct dpll_pin_registration, list); | |
791 | WARN_ON(!reg); | |
792 | return reg; | |
793 | } | |
794 | ||
795 | void *dpll_pin_on_dpll_priv(struct dpll_device *dpll, | |
796 | struct dpll_pin *pin) | |
797 | { | |
798 | struct dpll_pin_registration *reg; | |
799 | struct dpll_pin_ref *ref; | |
800 | ||
801 | ref = xa_load(&dpll->pin_refs, pin->pin_idx); | |
802 | if (!ref) | |
803 | return NULL; | |
804 | reg = dpll_pin_registration_first(ref); | |
805 | return reg->priv; | |
806 | } | |
807 | ||
808 | void *dpll_pin_on_pin_priv(struct dpll_pin *parent, | |
809 | struct dpll_pin *pin) | |
810 | { | |
811 | struct dpll_pin_registration *reg; | |
812 | struct dpll_pin_ref *ref; | |
813 | ||
814 | ref = xa_load(&pin->parent_refs, parent->pin_idx); | |
815 | if (!ref) | |
816 | return NULL; | |
817 | reg = dpll_pin_registration_first(ref); | |
818 | return reg->priv; | |
819 | } | |
820 | ||
821 | const struct dpll_pin_ops *dpll_pin_ops(struct dpll_pin_ref *ref) | |
822 | { | |
823 | struct dpll_pin_registration *reg; | |
824 | ||
825 | reg = dpll_pin_registration_first(ref); | |
826 | return reg->ops; | |
827 | } | |
828 | ||
829 | static int __init dpll_init(void) | |
830 | { | |
831 | int ret; | |
832 | ||
833 | ret = genl_register_family(&dpll_nl_family); | |
834 | if (ret) | |
835 | goto error; | |
836 | ||
837 | return 0; | |
838 | ||
839 | error: | |
840 | mutex_destroy(&dpll_lock); | |
841 | return ret; | |
842 | } | |
843 | ||
844 | static void __exit dpll_exit(void) | |
845 | { | |
846 | genl_unregister_family(&dpll_nl_family); | |
847 | mutex_destroy(&dpll_lock); | |
848 | } | |
849 | ||
850 | subsys_initcall(dpll_init); | |
851 | module_exit(dpll_exit); |