Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 146 insertions, 0 deletions

diff --git a/drivers/platform/chrome/cros_ec_vbc.c b/drivers/platform/chrome/cros_ec_vbc.c
new file mode 100644
index 000000000..c859c862d
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_vbc.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Expose the vboot context nvram to userspace
+//
+// Copyright (C) 2012 Google, Inc.
+// Copyright (C) 2015 Collabora Ltd.
+
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_data/cros_ec_proto.h>
+#include <linux/slab.h>
+
+#define DRV_NAME "cros-ec-vbc"
+
+static ssize_t vboot_context_read(struct file *filp, struct kobject *kobj,
+				  struct bin_attribute *att, char *buf,
+				  loff_t pos, size_t count)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
+	struct cros_ec_device *ecdev = ec->ec_dev;
+	struct ec_params_vbnvcontext *params;
+	struct cros_ec_command *msg;
+	int err;
+	const size_t para_sz = sizeof(params->op);
+	const size_t resp_sz = sizeof(struct ec_response_vbnvcontext);
+	const size_t payload = max(para_sz, resp_sz);
+
+	msg = kmalloc(sizeof(*msg) + payload, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	/* NB: we only kmalloc()ated enough space for the op field */
+	params = (struct ec_params_vbnvcontext *)msg->data;
+	params->op = EC_VBNV_CONTEXT_OP_READ;
+
+	msg->version = EC_VER_VBNV_CONTEXT;
+	msg->command = EC_CMD_VBNV_CONTEXT;
+	msg->outsize = para_sz;
+	msg->insize = resp_sz;
+
+	err = cros_ec_cmd_xfer_status(ecdev, msg);
+	if (err < 0) {
+		dev_err(dev, "Error sending read request: %d\n", err);
+		kfree(msg);
+		return err;
+	}
+
+	memcpy(buf, msg->data, resp_sz);
+
+	kfree(msg);
+	return resp_sz;
+}
+
+static ssize_t vboot_context_write(struct file *filp, struct kobject *kobj,
+				   struct bin_attribute *attr, char *buf,
+				   loff_t pos, size_t count)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
+	struct cros_ec_device *ecdev = ec->ec_dev;
+	struct ec_params_vbnvcontext *params;
+	struct cros_ec_command *msg;
+	int err;
+	const size_t para_sz = sizeof(*params);
+	const size_t data_sz = sizeof(params->block);
+
+	/* Only write full values */
+	if (count != data_sz)
+		return -EINVAL;
+
+	msg = kmalloc(sizeof(*msg) + para_sz, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	params = (struct ec_params_vbnvcontext *)msg->data;
+	params->op = EC_VBNV_CONTEXT_OP_WRITE;
+	memcpy(params->block, buf, data_sz);
+
+	msg->version = EC_VER_VBNV_CONTEXT;
+	msg->command = EC_CMD_VBNV_CONTEXT;
+	msg->outsize = para_sz;
+	msg->insize = 0;
+
+	err = cros_ec_cmd_xfer_status(ecdev, msg);
+	if (err < 0) {
+		dev_err(dev, "Error sending write request: %d\n", err);
+		kfree(msg);
+		return err;
+	}
+
+	kfree(msg);
+	return data_sz;
+}
+
+static BIN_ATTR_RW(vboot_context, 16);
+
+static struct bin_attribute *cros_ec_vbc_bin_attrs[] = {
+	&bin_attr_vboot_context,
+	NULL
+};
+
+static const struct attribute_group cros_ec_vbc_attr_group = {
+	.name = "vbc",
+	.bin_attrs = cros_ec_vbc_bin_attrs,
+};
+
+static int cros_ec_vbc_probe(struct platform_device *pd)
+{
+	struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
+	struct device *dev = &pd->dev;
+	int ret;
+
+	ret = sysfs_create_group(&ec_dev->class_dev.kobj,
+				 &cros_ec_vbc_attr_group);
+	if (ret < 0)
+		dev_err(dev, "failed to create %s attributes. err=%d\n",
+			cros_ec_vbc_attr_group.name, ret);
+
+	return ret;
+}
+
+static int cros_ec_vbc_remove(struct platform_device *pd)
+{
+	struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
+
+	sysfs_remove_group(&ec_dev->class_dev.kobj,
+			   &cros_ec_vbc_attr_group);
+
+	return 0;
+}
+
+static struct platform_driver cros_ec_vbc_driver = {
+	.driver = {
+		.name = DRV_NAME,
+	},
+	.probe = cros_ec_vbc_probe,
+	.remove = cros_ec_vbc_remove,
+};
+
+module_platform_driver(cros_ec_vbc_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Expose the vboot context nvram to userspace");
+MODULE_ALIAS("platform:" DRV_NAME);