![YueHaibing](/assets/img/avatar_default.png)
Fix sparse warning: drivers/platform/chrome/cros_ec_debugfs.c:256:30: warning: symbol 'cros_ec_console_log_fops' was not declared. Should it be static? drivers/platform/chrome/cros_ec_debugfs.c:265:30: warning: symbol 'cros_ec_pdinfo_fops' was not declared. Should it be static? drivers/platform/chrome/cros_ec_lightbar.c:550:24: warning: symbol 'cros_ec_lightbar_attr_group' was not declared. Should it be static? drivers/platform/chrome/cros_ec_sysfs.c:338:24: warning: symbol 'cros_ec_attr_group' was not declared. Should it be static? drivers/platform/chrome/cros_ec_vbc.c:104:24: warning: symbol 'cros_ec_vbc_attr_group' was not declared. Should it be static? drivers/platform/chrome/cros_ec_lpc.c:408:25: warning: symbol 'cros_ec_lpc_pm_ops' was not declared. Should it be static? Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: Benson Leung <bleung@chromium.org> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
147 lines
3.6 KiB
C
147 lines
3.6 KiB
C
// 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/mfd/cros_ec.h>
|
|
#include <linux/mfd/cros_ec_commands.h>
|
|
#include <linux/module.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 = container_of(kobj, struct device, 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(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 = container_of(kobj, struct device, 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(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 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);
|