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From: Oleksij Rempel <o.rempel@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Oleksij Rempel <o.rempel@pengutronix.de>
Subject: [PATCH v4 4/7] fs: add prng device
Date: Tue, 21 Mar 2017 10:24:08 +0100	[thread overview]
Message-ID: <20170321092411.8844-5-o.rempel@pengutronix.de> (raw)
In-Reply-To: <20170321092411.8844-1-o.rempel@pengutronix.de>

this should provide easy access to get_random_bytes() interfaces.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 commands/stddev.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/commands/stddev.c b/commands/stddev.c
index 318d05741..93da2c739 100644
--- a/commands/stddev.c
+++ b/commands/stddev.c
@@ -17,6 +17,7 @@
 
 #include <common.h>
 #include <init.h>
+#include <stdlib.h>
 
 static ssize_t zero_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags)
 {
@@ -100,3 +101,31 @@ static int null_init(void)
 }
 
 device_initcall(null_init);
+
+static ssize_t prng_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags)
+{
+	get_random_bytes(buf, count);
+	return count;
+}
+
+static struct file_operations prngops = {
+	.read  = prng_read,
+	.lseek = dev_lseek_default,
+};
+
+static int prng_init(void)
+{
+	struct cdev *cdev;
+
+	cdev = xzalloc(sizeof (*cdev));
+
+	cdev->name = "prng";
+	cdev->flags = DEVFS_IS_CHARACTER_DEV;
+	cdev->ops = &prngops;
+
+	devfs_create(cdev);
+
+	return 0;
+}
+
+device_initcall(prng_init);
-- 
2.11.0


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  parent reply	other threads:[~2017-03-21  9:24 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-21  9:24 [PATCH v4 0/7] upstream hwrng framework Oleksij Rempel
2017-03-21  9:24 ` [PATCH v4 1/7] drivers: add simple hw_random implementation Oleksij Rempel
2017-03-21  9:24 ` [PATCH v4 2/7] lib: random: get_random_bytes from HWRNG if present Oleksij Rempel
2017-03-21  9:24 ` [PATCH v4 3/7] caamrng: port to hwrng framework Oleksij Rempel
2017-03-21  9:24 ` Oleksij Rempel [this message]
2017-03-21  9:24 ` [PATCH v4 5/7] crypto: caam - fix RNG buffer cache alignment Oleksij Rempel
2017-03-21  9:24 ` [PATCH v4 6/7] common: password: make use of get_crypto_bytes Oleksij Rempel
2017-03-21  9:24 ` [PATCH v4 7/7] add seed command Oleksij Rempel

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