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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 Google LLC
*
* Sysfs properties to view and modify EC-controlled features on Wilco devices.
* The entries will appear under /sys/bus/platform/devices/GOOG000C:00/
*
* See Documentation/ABI/testing/sysfs-platform-wilco-ec for more information.
*/
#include <linux/platform_data/wilco-ec.h>
#include <linux/sysfs.h>
#define CMD_KB_CMOS 0x7C
#define SUB_CMD_KB_CMOS_AUTO_ON 0x03
struct boot_on_ac_request {
u8 cmd; /* Always CMD_KB_CMOS */
u8 reserved1;
u8 sub_cmd; /* Always SUB_CMD_KB_CMOS_AUTO_ON */
u8 reserved3to5[3];
u8 val; /* Either 0 or 1 */
u8 reserved7;
} __packed;
static ssize_t boot_on_ac_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct wilco_ec_device *ec = dev_get_drvdata(dev);
struct boot_on_ac_request rq;
struct wilco_ec_message msg;
int ret;
u8 val;
ret = kstrtou8(buf, 10, &val);
if (ret < 0)
return ret;
if (val > 1)
return -EINVAL;
memset(&rq, 0, sizeof(rq));
rq.cmd = CMD_KB_CMOS;
rq.sub_cmd = SUB_CMD_KB_CMOS_AUTO_ON;
rq.val = val;
memset(&msg, 0, sizeof(msg));
msg.type = WILCO_EC_MSG_LEGACY;
msg.request_data = &rq;
msg.request_size = sizeof(rq);
ret = wilco_ec_mailbox(ec, &msg);
if (ret < 0)
return ret;
return count;
}
static DEVICE_ATTR_WO(boot_on_ac);
static struct attribute *wilco_dev_attrs[] = {
&dev_attr_boot_on_ac.attr,
NULL,
};
static struct attribute_group wilco_dev_attr_group = {
.attrs = wilco_dev_attrs,
};
int wilco_ec_add_sysfs(struct wilco_ec_device *ec)
{
return sysfs_create_group(&ec->dev->kobj, &wilco_dev_attr_group);
}
void wilco_ec_remove_sysfs(struct wilco_ec_device *ec)
{
sysfs_remove_group(&ec->dev->kobj, &wilco_dev_attr_group);
}
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