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authorSascha Hauer <s.hauer@pengutronix.de>2012-07-02 11:03:24 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2012-07-02 11:04:25 +0200
commit62fe47768b26b7dceda983a16b042ddc4b59d246 (patch)
tree63930861f406521a41066cc5408044b52c5cb1d8 /commands/stddev.c
parentc77dd2a81b178e4530aaad6413697d9cb5ea870e (diff)
parent488dc91f93bc143c7fa7d435fba0a5f0a70fd137 (diff)
downloadbarebox-62fe47768b26b7dceda983a16b042ddc4b59d246.tar.gz
Merge branch 'for-next/devnull'
Conflicts: commands/mem.c
Diffstat (limited to 'commands/stddev.c')
-rw-r--r--commands/stddev.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/commands/stddev.c b/commands/stddev.c
new file mode 100644
index 0000000..97080eb
--- /dev/null
+++ b/commands/stddev.c
@@ -0,0 +1,106 @@
+/*
+ * 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, loff_t 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);
+
+static ssize_t full_read(struct cdev *cdev, void *buf, size_t count, loff_t offset, ulong flags)
+{
+ memset(buf, 0xff, count);
+ return count;
+}
+
+static struct file_operations fullops = {
+ .read = full_read,
+ .lseek = dev_lseek_default,
+};
+
+static int full_init(void)
+{
+ struct cdev *cdev;
+
+ cdev = xzalloc(sizeof (*cdev));
+
+ cdev->name = "full";
+ cdev->size = ~0;
+ cdev->ops = &fullops;
+
+ devfs_create(cdev);
+
+ return 0;
+}
+
+device_initcall(full_init);
+
+static ssize_t null_write(struct cdev *cdev, const void *buf, size_t count, loff_t offset, ulong flags)
+{
+ return count;
+}
+
+static struct file_operations nullops = {
+ .write = null_write,
+ .lseek = dev_lseek_default,
+};
+
+static int null_init(void)
+{
+ struct cdev *cdev;
+
+ cdev = xzalloc(sizeof (*cdev));
+
+ cdev->name = "null";
+ cdev->size = 0;
+ cdev->ops = &nullops;
+
+ devfs_create(cdev);
+
+ return 0;
+}
+
+device_initcall(null_init);