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@@ -0,0 +1,219 @@
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+/*
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+ * Generic OPP debugfs interface
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+ *
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+ * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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+
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+#include <linux/debugfs.h>
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+#include <linux/device.h>
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+#include <linux/err.h>
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+#include <linux/init.h>
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+#include <linux/limits.h>
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+
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+#include "opp.h"
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+
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+static struct dentry *rootdir;
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+
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+static void opp_set_dev_name(const struct device *dev, char *name)
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+{
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+ if (dev->parent)
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+ snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent),
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+ dev_name(dev));
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+ else
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+ snprintf(name, NAME_MAX, "%s", dev_name(dev));
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+}
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+
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+void opp_debug_remove_one(struct dev_pm_opp *opp)
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+{
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+ debugfs_remove_recursive(opp->dentry);
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+}
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+
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+int opp_debug_create_one(struct dev_pm_opp *opp, struct device_opp *dev_opp)
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+{
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+ struct dentry *pdentry = dev_opp->dentry;
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+ struct dentry *d;
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+ char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */
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+
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+ /* Rate is unique to each OPP, use it to give opp-name */
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+ snprintf(name, sizeof(name), "opp:%lu", opp->rate);
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+
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+ /* Create per-opp directory */
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+ d = debugfs_create_dir(name, pdentry);
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+ if (!d)
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+ return -ENOMEM;
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+
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+ if (!debugfs_create_bool("available", S_IRUGO, d, &opp->available))
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+ return -ENOMEM;
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+
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+ if (!debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic))
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+ return -ENOMEM;
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+
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+ if (!debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo))
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+ return -ENOMEM;
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+
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+ if (!debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend))
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+ return -ENOMEM;
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+
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+ if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate))
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+ return -ENOMEM;
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+
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+ if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d, &opp->u_volt))
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+ return -ENOMEM;
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+
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+ if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d, &opp->u_volt_min))
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+ return -ENOMEM;
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+
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+ if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d, &opp->u_volt_max))
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+ return -ENOMEM;
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+
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+ if (!debugfs_create_ulong("u_amp", S_IRUGO, d, &opp->u_amp))
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+ return -ENOMEM;
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+
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+ if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
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+ &opp->clock_latency_ns))
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+ return -ENOMEM;
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+
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+ opp->dentry = d;
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+ return 0;
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+}
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+
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+static int device_opp_debug_create_dir(struct device_list_opp *list_dev,
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+ struct device_opp *dev_opp)
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+{
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+ const struct device *dev = list_dev->dev;
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+ struct dentry *d;
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+
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+ opp_set_dev_name(dev, dev_opp->dentry_name);
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+
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+ /* Create device specific directory */
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+ d = debugfs_create_dir(dev_opp->dentry_name, rootdir);
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+ if (!d) {
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+ dev_err(dev, "%s: Failed to create debugfs dir\n", __func__);
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+ return -ENOMEM;
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+ }
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+
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+ list_dev->dentry = d;
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+ dev_opp->dentry = d;
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+
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+ return 0;
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+}
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+
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+static int device_opp_debug_create_link(struct device_list_opp *list_dev,
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+ struct device_opp *dev_opp)
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+{
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+ const struct device *dev = list_dev->dev;
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+ char name[NAME_MAX];
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+ struct dentry *d;
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+
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+ opp_set_dev_name(list_dev->dev, name);
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+
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+ /* Create device specific directory link */
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+ d = debugfs_create_symlink(name, rootdir, dev_opp->dentry_name);
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+ if (!d) {
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+ dev_err(dev, "%s: Failed to create link\n", __func__);
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+ return -ENOMEM;
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+ }
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+
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+ list_dev->dentry = d;
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+
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+ return 0;
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+}
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+
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+/**
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+ * opp_debug_register - add a device opp node to the debugfs 'opp' directory
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+ * @list_dev: list-dev pointer for device
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+ * @dev_opp: the device-opp being added
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+ *
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+ * Dynamically adds device specific directory in debugfs 'opp' directory. If the
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+ * device-opp is shared with other devices, then links will be created for all
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+ * devices except the first.
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+ *
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+ * Return: 0 on success, otherwise negative error.
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+ */
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+int opp_debug_register(struct device_list_opp *list_dev,
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+ struct device_opp *dev_opp)
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+{
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+ if (!rootdir) {
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+ pr_debug("%s: Uninitialized rootdir\n", __func__);
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+ return -EINVAL;
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+ }
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+
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+ if (dev_opp->dentry)
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+ return device_opp_debug_create_link(list_dev, dev_opp);
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+
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+ return device_opp_debug_create_dir(list_dev, dev_opp);
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+}
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+
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+static void opp_migrate_dentry(struct device_list_opp *list_dev,
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+ struct device_opp *dev_opp)
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+{
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+ struct device_list_opp *new_dev;
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+ const struct device *dev;
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+ struct dentry *dentry;
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+
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+ /* Look for next list-dev */
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+ list_for_each_entry(new_dev, &dev_opp->dev_list, node)
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+ if (new_dev != list_dev)
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+ break;
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+
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+ /* new_dev is guaranteed to be valid here */
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+ dev = new_dev->dev;
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+ debugfs_remove_recursive(new_dev->dentry);
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+
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+ opp_set_dev_name(dev, dev_opp->dentry_name);
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+
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+ dentry = debugfs_rename(rootdir, list_dev->dentry, rootdir,
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+ dev_opp->dentry_name);
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+ if (!dentry) {
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+ dev_err(dev, "%s: Failed to rename link from: %s to %s\n",
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+ __func__, dev_name(list_dev->dev), dev_name(dev));
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+ return;
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+ }
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+
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+ new_dev->dentry = dentry;
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+ dev_opp->dentry = dentry;
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+}
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+
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+/**
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+ * opp_debug_unregister - remove a device opp node from debugfs opp directory
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+ * @list_dev: list-dev pointer for device
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+ * @dev_opp: the device-opp being removed
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+ *
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+ * Dynamically removes device specific directory from debugfs 'opp' directory.
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+ */
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+void opp_debug_unregister(struct device_list_opp *list_dev,
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+ struct device_opp *dev_opp)
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+{
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+ if (list_dev->dentry == dev_opp->dentry) {
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+ /* Move the real dentry object under another device */
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+ if (!list_is_singular(&dev_opp->dev_list)) {
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+ opp_migrate_dentry(list_dev, dev_opp);
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+ goto out;
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+ }
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+ dev_opp->dentry = NULL;
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+ }
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+
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+ debugfs_remove_recursive(list_dev->dentry);
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+
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+out:
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+ list_dev->dentry = NULL;
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+}
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+
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+static int __init opp_debug_init(void)
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+{
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+ /* Create /sys/kernel/debug/opp directory */
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+ rootdir = debugfs_create_dir("opp", NULL);
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+ if (!rootdir) {
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+ pr_err("%s: Failed to create root directory\n", __func__);
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+ return -ENOMEM;
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+ }
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+
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+ return 0;
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+}
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+core_initcall(opp_debug_init);
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Viresh Kumar