regulator: generate status events for all regulators

Change-Id: I6aba475047e0f1e1186bff88dfe9aedaf6a8b415
Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Reviewed-on: http://git-master/r/31532
Reviewed-by: Niket Sirsi <nsirsi@nvidia.com>
Tested-by: Niket Sirsi <nsirsi@nvidia.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 1a6582f22186..d3aec469434a 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -28,6 +28,9 @@
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/regulator.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
 
 #include "dummy.h"
 
@@ -2734,4 +2737,59 @@ unlock:
 
 	return 0;
 }
+
+#ifdef CONFIG_DEBUG_FS
+static int regulator_syncevent(struct file *file, const char __user *user_buf,
+				size_t count, loff_t *ppos)
+{
+	struct regulator_dev *rdev;
+	char buffer[40];
+	int buf_size;
+
+	memset(buffer, 0, sizeof(buffer));
+	buf_size = min(count, (sizeof(buffer)-1));
+
+	if (copy_from_user(buffer, user_buf, buf_size))
+		return -EFAULT;
+
+	if (!strnicmp("all", buffer, 3)) {
+
+		mutex_lock(&regulator_list_mutex);
+
+		list_for_each_entry(rdev, &regulator_list, list) {
+			mutex_lock(&rdev->mutex);
+
+			if (_regulator_is_enabled(rdev))
+				trace_regulator_enable(rdev_get_name(rdev));
+			else
+				trace_regulator_disable(rdev_get_name(rdev));
+
+			trace_regulator_set_voltage(rdev_get_name(rdev),
+				_regulator_get_voltage(rdev),
+				_regulator_get_voltage(rdev));
+
+			mutex_unlock(&rdev->mutex);
+		}
+	}
+
+	mutex_unlock(&regulator_list_mutex);
+
+	return count;
+}
+
+static const struct file_operations regulator_syncevent_fops = {
+	.write		= regulator_syncevent,
+};
+
+static int __init regulator_init_debugfs(void)
+{
+	debugfs_create_file("syncevent_regulators", S_IWUGO, NULL, NULL,
+			&regulator_syncevent_fops);
+
+	return 0;
+}
+
+late_initcall(regulator_init_debugfs);
+#endif
+
 late_initcall(regulator_init_complete);