Lines Matching full:rng
34 /* the current rng has been explicitly chosen by user via sysfs */
41 /* Protects rng read functions, data_avail, rng_buffer and rng_fillbuf */
56 static int hwrng_init(struct hwrng *rng);
59 static inline int rng_get_data(struct hwrng *rng, u8 *buffer, size_t size,
69 struct hwrng *rng = container_of(kref, struct hwrng, ref); in cleanup_rng() local
71 if (rng->cleanup) in cleanup_rng()
72 rng->cleanup(rng); in cleanup_rng()
74 complete(&rng->cleanup_done); in cleanup_rng()
77 static int set_current_rng(struct hwrng *rng) in set_current_rng() argument
83 err = hwrng_init(rng); in set_current_rng()
88 current_rng = rng; in set_current_rng()
124 struct hwrng *rng; in get_current_rng() local
129 rng = get_current_rng_nolock(); in get_current_rng()
132 return rng; in get_current_rng()
135 static void put_rng(struct hwrng *rng) in put_rng() argument
139 * on rng again immediately. in put_rng()
142 if (rng) in put_rng()
143 kref_put(&rng->ref, cleanup_rng); in put_rng()
147 static int hwrng_init(struct hwrng *rng) in hwrng_init() argument
149 if (kref_get_unless_zero(&rng->ref)) in hwrng_init()
152 if (rng->init) { in hwrng_init()
155 ret = rng->init(rng); in hwrng_init()
160 kref_init(&rng->ref); in hwrng_init()
161 reinit_completion(&rng->cleanup_done); in hwrng_init()
164 current_quality = rng->quality; /* obsolete */ in hwrng_init()
179 static inline int rng_get_data(struct hwrng *rng, u8 *buffer, size_t size, in rng_get_data() argument
184 if (rng->read) { in rng_get_data()
187 err = rng->read(rng, buffer, size, wait); in rng_get_data()
194 if (rng->data_present) in rng_get_data()
195 present = rng->data_present(rng, wait); in rng_get_data()
200 return rng->data_read(rng, (u32 *)buffer); in rng_get_data()
212 struct hwrng *rng; in rng_dev_read() local
215 rng = get_current_rng(); in rng_dev_read()
216 if (IS_ERR(rng)) { in rng_dev_read()
217 err = PTR_ERR(rng); in rng_dev_read()
220 if (!rng) { in rng_dev_read()
230 bytes_read = rng_get_data(rng, rng_buffer, in rng_dev_read()
255 put_rng(rng); in rng_dev_read()
283 put_rng(rng); in rng_dev_read()
306 struct hwrng *rng, *new_rng = NULL; in enable_best_rng() local
311 /* no rng to use? */ in enable_best_rng()
318 /* use the rng which offers the best quality */ in enable_best_rng()
319 list_for_each_entry(rng, &rng_list, list) { in enable_best_rng()
320 if (!new_rng || rng->quality > new_rng->quality) in enable_best_rng()
321 new_rng = rng; in enable_best_rng()
336 struct hwrng *rng, *new_rng; in rng_current_store() local
345 list_for_each_entry(rng, &rng_list, list) { in rng_current_store()
346 if (sysfs_streq(rng->name, buf)) { in rng_current_store()
347 err = set_current_rng(rng); in rng_current_store()
368 struct hwrng *rng; in rng_current_show() local
370 rng = get_current_rng(); in rng_current_show()
371 if (IS_ERR(rng)) in rng_current_show()
372 return PTR_ERR(rng); in rng_current_show()
374 ret = sysfs_emit(buf, "%s\n", rng ? rng->name : "none"); in rng_current_show()
375 put_rng(rng); in rng_current_show()
385 struct hwrng *rng; in rng_available_show() local
391 list_for_each_entry(rng, &rng_list, list) { in rng_available_show()
392 strlcat(buf, rng->name, PAGE_SIZE); in rng_available_show()
413 struct hwrng *rng; in rng_quality_show() local
415 rng = get_current_rng(); in rng_quality_show()
416 if (IS_ERR(rng)) in rng_quality_show()
417 return PTR_ERR(rng); in rng_quality_show()
419 if (!rng) /* no need to put_rng */ in rng_quality_show()
422 ret = sysfs_emit(buf, "%hu\n", rng->quality); in rng_quality_show()
423 put_rng(rng); in rng_quality_show()
456 /* the best available RNG may have changed */ in rng_quality_store()
486 struct hwrng *rng; in hwrng_fillfn() local
488 rng = get_current_rng(); in hwrng_fillfn()
489 if (IS_ERR(rng) || !rng) in hwrng_fillfn()
492 rc = rng_get_data(rng, rng_fillbuf, in hwrng_fillfn()
494 if (current_quality != rng->quality) in hwrng_fillfn()
495 rng->quality = current_quality; /* obsolete */ in hwrng_fillfn()
496 quality = rng->quality; in hwrng_fillfn()
500 hwrng_msleep(rng, 10000); in hwrng_fillfn()
502 put_rng(rng); in hwrng_fillfn()
522 int hwrng_register(struct hwrng *rng) in hwrng_register() argument
527 if (!rng->name || (!rng->data_read && !rng->read)) in hwrng_register()
535 if (strcmp(tmp->name, rng->name) == 0) in hwrng_register()
538 list_add_tail(&rng->list, &rng_list); in hwrng_register()
540 init_completion(&rng->cleanup_done); in hwrng_register()
541 complete(&rng->cleanup_done); in hwrng_register()
542 init_completion(&rng->dying); in hwrng_register()
545 rng->quality = min_t(u16, min_t(u16, default_quality, 1024), rng->quality ?: 1024); in hwrng_register()
548 (!cur_rng_set_by_user && rng->quality > current_rng->quality)) { in hwrng_register()
550 * Set new rng as current as the new rng source in hwrng_register()
554 err = set_current_rng(rng); in hwrng_register()
567 void hwrng_unregister(struct hwrng *rng) in hwrng_unregister() argument
574 list_del(&rng->list); in hwrng_unregister()
575 complete_all(&rng->dying); in hwrng_unregister()
576 if (current_rng == rng) { in hwrng_unregister()
595 wait_for_completion(&rng->cleanup_done); in hwrng_unregister()
614 int devm_hwrng_register(struct device *dev, struct hwrng *rng) in devm_hwrng_register() argument
623 error = hwrng_register(rng); in devm_hwrng_register()
629 *ptr = rng; in devm_hwrng_register()
635 void devm_hwrng_unregister(struct device *dev, struct hwrng *rng) in devm_hwrng_unregister() argument
637 devres_release(dev, devm_hwrng_release, devm_hwrng_match, rng); in devm_hwrng_unregister()
641 long hwrng_msleep(struct hwrng *rng, unsigned int msecs) in hwrng_msleep() argument
645 return wait_for_completion_interruptible_timeout(&rng->dying, timeout); in hwrng_msleep()
649 long hwrng_yield(struct hwrng *rng) in hwrng_yield() argument
651 return wait_for_completion_interruptible_timeout(&rng->dying, 1); in hwrng_yield()
693 MODULE_DESCRIPTION("H/W Random Number Generator (RNG) driver");