ARM: tegra: add sysfs support for tegra cpuquiet driver

Change-Id: I215c5de8e98d139a93113978e1e27adb5a6b252c
Signed-off-by: Sai Charan Gurrappadi <sgurrappadi@nvidia.com>
Reviewed-on: http://git-master/r/111283
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>

1 files changed, 133 insertions, 0 deletions

diff --git a/drivers/cpuquiet/cpuquiet_attribute.c b/drivers/cpuquiet/cpuquiet_attribute.c
new file mode 100644
index 000000000000..9f1aa430149d
--- /dev/null
+++ b/drivers/cpuquiet/cpuquiet_attribute.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2012 NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/cpuquiet.h>
+
+ssize_t show_int_attribute(struct cpuquiet_attribute *cattr, char *buf)
+{
+	return sprintf(buf, "%d\n", *((int *)cattr->param));
+}
+
+ssize_t store_int_attribute(struct cpuquiet_attribute *cattr,
+					const char *buf, size_t count)
+{
+	int err, val;
+
+	err = kstrtoint(buf, 0, &val);
+	if (err < 0)
+		return err;
+
+	*((int *)(cattr->param)) = val;
+
+	if (cattr->store_callback)
+		cattr->store_callback(cattr);
+
+	return count;
+}
+
+ssize_t show_bool_attribute(struct cpuquiet_attribute *cattr, char *buf)
+{
+	return sprintf(buf, "%d\n", *((bool *)cattr->param));
+}
+
+ssize_t store_bool_attribute(struct cpuquiet_attribute *cattr,
+					const char *buf, size_t count)
+{
+	int err, val;
+
+	err = kstrtoint(buf, 0, &val);
+	if (err < 0)
+		return err;
+
+	if (val < 0 || val > 1)
+		return -EINVAL;
+
+	*((bool *)(cattr->param)) = val;
+
+	if (cattr->store_callback)
+		cattr->store_callback(cattr);
+
+	return count;
+}
+
+ssize_t show_uint_attribute(struct cpuquiet_attribute *cattr, char *buf)
+{
+	return sprintf(buf, "%u\n", *((unsigned int *)cattr->param));
+}
+
+ssize_t store_uint_attribute(struct cpuquiet_attribute *cattr,
+					const char *buf, size_t count)
+{
+	int err;
+	unsigned int val;
+
+	err = kstrtouint(buf, 0, &val);
+	if (err < 0)
+		return err;
+
+	*((unsigned int *)(cattr->param)) = val;
+
+	if (cattr->store_callback)
+		cattr->store_callback(cattr);
+
+	return count;
+}
+
+ssize_t store_ulong_attribute(struct cpuquiet_attribute *cattr,
+					const char *buf, size_t count)
+{
+	int err;
+	unsigned long val;
+
+	err = kstrtoul(buf, 0, &val);
+	if (err < 0)
+		return err;
+
+	*((unsigned long *)(cattr->param)) = val;
+
+	if (cattr->store_callback)
+		cattr->store_callback(cattr);
+
+	return count;
+}
+
+ssize_t show_ulong_attribute(struct cpuquiet_attribute *cattr,
+					char *buf)
+{
+	return sprintf(buf, "%lu\n", *((unsigned long *)cattr->param));
+}
+
+ssize_t cpuquiet_auto_sysfs_store(struct kobject *kobj,
+	struct attribute *attr, const char *buf, size_t count)
+{
+	struct cpuquiet_attribute *cattr =
+		container_of(attr, struct cpuquiet_attribute, attr);
+
+	if (cattr->store)
+		return cattr->store(cattr, buf, count);
+
+	return -EINVAL;
+}
+
+ssize_t cpuquiet_auto_sysfs_show(struct kobject *kobj,
+		struct attribute *attr, char *buf)
+{
+	struct cpuquiet_attribute *cattr =
+		container_of(attr, struct cpuquiet_attribute, attr);
+
+	return cattr->show(cattr, buf);
+}