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authorAlexander Shiyan <shc_work@mail.ru>2012-06-09 11:34:25 +0400
committerSascha Hauer <s.hauer@pengutronix.de>2012-06-30 12:46:01 +0200
commit0e4fdcc81b8f47b613b8d3d61005bc920a2ebcad (patch)
tree49626c7bd3704bdc16d7ed942bb5c4c322f1a80d /commands/stddev.c
parenta6e358b2f5b219fda18a7bc9348cb969043c19d5 (diff)
downloadbarebox-0e4fdcc81b8f47b613b8d3d61005bc920a2ebcad.tar.gz
Move /dev/zero to separate unit
This patch allows to present "/dev/zero" always in system and not depending of mem-command. Standard files allow to test other memory devices, not only "mem", such as NOR, NAND, MCI-devices e.t.c. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/stddev.c')
-rw-r--r--commands/stddev.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/commands/stddev.c b/commands/stddev.c
new file mode 100644
index 0000000..18fea94
--- /dev/null
+++ b/commands/stddev.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <init.h>
+
+static ssize_t zero_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
+{
+ memset(buf, 0, count);
+ return count;
+}
+
+static struct file_operations zeroops = {
+ .read = zero_read,
+ .lseek = dev_lseek_default,
+};
+
+static int zero_init(void)
+{
+ struct cdev *cdev;
+
+ cdev = xzalloc(sizeof (*cdev));
+
+ cdev->name = "zero";
+ cdev->size = ~0;
+ cdev->ops = &zeroops;
+
+ devfs_create(cdev);
+
+ return 0;
+}
+
+device_initcall(zero_init);