Add dm_rng_read_default() function, which obtain a series of random bytes. In some cases, such function would be useful because it allows the caller to abstract away from RNG device.
Signed-off-by: Alexey Romanov avromanov@salutedevices.com --- drivers/rng/rng-uclass.c | 20 ++++++++++++++++++++ include/rng.h | 10 ++++++++++ 2 files changed, 30 insertions(+)
diff --git a/drivers/rng/rng-uclass.c b/drivers/rng/rng-uclass.c index 53108e1b31..3a8fb7d276 100644 --- a/drivers/rng/rng-uclass.c +++ b/drivers/rng/rng-uclass.c @@ -19,6 +19,26 @@ int dm_rng_read(struct udevice *dev, void *buffer, size_t size) return ops->read(dev, buffer, size); }
+int dm_rng_read_default(void *buffer, size_t size) +{ + struct udevice *rng; + int ret; + + ret = uclass_get_device(UCLASS_RNG, 0, &rng); + if (ret) { + pr_err("Can't get RNG device (%d)\n", ret); + return ret; + } + + ret = dm_rng_read(rng, buffer, size); + if (ret) { + pr_err("Can't read from RNG device (%d)\n", ret); + return ret; + } + + return 0; +} + UCLASS_DRIVER(rng) = { .name = "rng", .id = UCLASS_RNG, diff --git a/include/rng.h b/include/rng.h index 37af554363..5537daae88 100644 --- a/include/rng.h +++ b/include/rng.h @@ -20,6 +20,16 @@ struct udevice; */ int dm_rng_read(struct udevice *dev, void *buffer, size_t size);
+/** + * dm_rng_read_default() - same as dm_rng_read(), except that caller + * don't need to pass an argument with RNG udevice. + * @buffer: input buffer to put the read random seed into + * @size: number of bytes of random seed read + * + * Return: 0 if OK, -ve on error + */ +int dm_rng_read_default(void *buffer, size_t size); + /** * struct dm_rng_ops - operations for the hwrng uclass *