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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/drivers/platform/chrome/cros_ec_vbc.c
..
..
@@ -1,34 +1,23 @@
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-/*
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- * cros_ec_vbc - Expose the vboot context nvram to userspace
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- *
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- * Copyright (C) 2015 Collabora Ltd.
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- *
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- * based on vendor driver,
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- *
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- * Copyright (C) 2012 The Chromium OS Authors
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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 as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- */
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+// SPDX-License-Identifier: GPL-2.0+
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+// Expose the vboot context nvram to userspace
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+//
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+// Copyright (C) 2012 Google, Inc.
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+// Copyright (C) 2015 Collabora Ltd.
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6
 
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 #include <linux/of.h>
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 #include <linux/platform_device.h>
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-#include <linux/mfd/cros_ec.h>
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-#include <linux/mfd/cros_ec_commands.h>
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+#include <linux/module.h>
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+#include <linux/platform_data/cros_ec_commands.h>
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+#include <linux/platform_data/cros_ec_proto.h>
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 #include <linux/slab.h>
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+
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+#define DRV_NAME "cros-ec-vbc"
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15
 
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 static ssize_t vboot_context_read(struct file *filp, struct kobject *kobj,
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 				  struct bin_attribute *att, char *buf,
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 				  loff_t pos, size_t count)
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 {
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-	struct device *dev = container_of(kobj, struct device, kobj);
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+	struct device *dev = kobj_to_dev(kobj);
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 	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
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 	struct cros_ec_device *ecdev = ec->ec_dev;
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 	struct ec_params_vbnvcontext *params;
..
..
@@ -51,7 +40,7 @@
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 	msg->outsize = para_sz;
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 	msg->insize = resp_sz;
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42
 
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-	err = cros_ec_cmd_xfer(ecdev, msg);
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+	err = cros_ec_cmd_xfer_status(ecdev, msg);
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 	if (err < 0) {
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 		dev_err(dev, "Error sending read request: %d\n", err);
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 		kfree(msg);
..
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@@ -68,7 +57,7 @@
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 				   struct bin_attribute *attr, char *buf,
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 				   loff_t pos, size_t count)
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 {
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-	struct device *dev = container_of(kobj, struct device, kobj);
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+	struct device *dev = kobj_to_dev(kobj);
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 	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
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 	struct cros_ec_device *ecdev = ec->ec_dev;
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 	struct ec_params_vbnvcontext *params;
..
..
@@ -94,7 +83,7 @@
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 	msg->outsize = para_sz;
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 	msg->insize = 0;
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85
 
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-	err = cros_ec_cmd_xfer(ecdev, msg);
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+	err = cros_ec_cmd_xfer_status(ecdev, msg);
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 	if (err < 0) {
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 		dev_err(dev, "Error sending write request: %d\n", err);
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 		kfree(msg);
..
..
@@ -105,21 +94,6 @@
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 	return data_sz;
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 }
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-static umode_t cros_ec_vbc_is_visible(struct kobject *kobj,
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-				      struct bin_attribute *a, int n)
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-{
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-	struct device *dev = container_of(kobj, struct device, kobj);
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-	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
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-	struct device_node *np = ec->ec_dev->dev->of_node;
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-
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-	if (IS_ENABLED(CONFIG_OF) && np) {
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-		if (of_property_read_bool(np, "google,has-vbc-nvram"))
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-			return a->attr.mode;
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-	}
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-
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-	return 0;
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-}
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-
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 static BIN_ATTR_RW(vboot_context, 16);
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 static struct bin_attribute *cros_ec_vbc_bin_attrs[] = {
..
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@@ -127,9 +101,46 @@
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 	NULL
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 };
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-struct attribute_group cros_ec_vbc_attr_group = {
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+static struct attribute_group cros_ec_vbc_attr_group = {
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 	.name = "vbc",
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 	.bin_attrs = cros_ec_vbc_bin_attrs,
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-	.is_bin_visible = cros_ec_vbc_is_visible,
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 };
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-EXPORT_SYMBOL(cros_ec_vbc_attr_group);
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+
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+static int cros_ec_vbc_probe(struct platform_device *pd)
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+{
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+	struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
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+	struct device *dev = &pd->dev;
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+	int ret;
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+
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+	ret = sysfs_create_group(&ec_dev->class_dev.kobj,
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+				 &cros_ec_vbc_attr_group);
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+	if (ret < 0)
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+		dev_err(dev, "failed to create %s attributes. err=%d\n",
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+			cros_ec_vbc_attr_group.name, ret);
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+
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+	return ret;
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+}
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+
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+static int cros_ec_vbc_remove(struct platform_device *pd)
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+{
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+	struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
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+
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+	sysfs_remove_group(&ec_dev->class_dev.kobj,
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+			   &cros_ec_vbc_attr_group);
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+
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+	return 0;
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+}
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+
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+static struct platform_driver cros_ec_vbc_driver = {
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+	.driver = {
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+		.name = DRV_NAME,
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+	},
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+	.probe = cros_ec_vbc_probe,
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+	.remove = cros_ec_vbc_remove,
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+};
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+
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+module_platform_driver(cros_ec_vbc_driver);
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+
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+MODULE_LICENSE("GPL");
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+MODULE_DESCRIPTION("Expose the vboot context nvram to userspace");
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+MODULE_ALIAS("platform:" DRV_NAME);