157 lines
3.5 KiB
C
157 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2019 Google LLC
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*
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* Sysfs properties to view and modify EC-controlled features on Wilco devices.
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* The entries will appear under /sys/bus/platform/devices/GOOG000C:00/
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*
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* See Documentation/ABI/testing/sysfs-platform-wilco-ec for more information.
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*/
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#include <linux/platform_data/wilco-ec.h>
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#include <linux/sysfs.h>
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#define CMD_KB_CMOS 0x7C
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#define SUB_CMD_KB_CMOS_AUTO_ON 0x03
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struct boot_on_ac_request {
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u8 cmd; /* Always CMD_KB_CMOS */
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u8 reserved1;
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u8 sub_cmd; /* Always SUB_CMD_KB_CMOS_AUTO_ON */
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u8 reserved3to5[3];
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u8 val; /* Either 0 or 1 */
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u8 reserved7;
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} __packed;
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#define CMD_EC_INFO 0x38
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enum get_ec_info_op {
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CMD_GET_EC_LABEL = 0,
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CMD_GET_EC_REV = 1,
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CMD_GET_EC_MODEL = 2,
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CMD_GET_EC_BUILD_DATE = 3,
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};
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struct get_ec_info_req {
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u8 cmd; /* Always CMD_EC_INFO */
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u8 reserved;
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u8 op; /* One of enum get_ec_info_op */
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} __packed;
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struct get_ec_info_resp {
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u8 reserved[2];
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char value[9]; /* __nonstring: might not be null terminated */
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} __packed;
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static ssize_t boot_on_ac_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct wilco_ec_device *ec = dev_get_drvdata(dev);
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struct boot_on_ac_request rq;
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struct wilco_ec_message msg;
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int ret;
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u8 val;
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ret = kstrtou8(buf, 10, &val);
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if (ret < 0)
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return ret;
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if (val > 1)
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return -EINVAL;
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memset(&rq, 0, sizeof(rq));
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rq.cmd = CMD_KB_CMOS;
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rq.sub_cmd = SUB_CMD_KB_CMOS_AUTO_ON;
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rq.val = val;
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memset(&msg, 0, sizeof(msg));
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msg.type = WILCO_EC_MSG_LEGACY;
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msg.request_data = &rq;
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msg.request_size = sizeof(rq);
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ret = wilco_ec_mailbox(ec, &msg);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR_WO(boot_on_ac);
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static ssize_t get_info(struct device *dev, char *buf, enum get_ec_info_op op)
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{
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struct wilco_ec_device *ec = dev_get_drvdata(dev);
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struct get_ec_info_req req = { .cmd = CMD_EC_INFO, .op = op };
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struct get_ec_info_resp resp;
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int ret;
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struct wilco_ec_message msg = {
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.type = WILCO_EC_MSG_LEGACY,
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.request_data = &req,
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.request_size = sizeof(req),
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.response_data = &resp,
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.response_size = sizeof(resp),
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};
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ret = wilco_ec_mailbox(ec, &msg);
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if (ret < 0)
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return ret;
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return scnprintf(buf, PAGE_SIZE, "%.*s\n", (int)sizeof(resp.value),
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(char *)&resp.value);
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}
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static ssize_t version_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return get_info(dev, buf, CMD_GET_EC_LABEL);
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}
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static DEVICE_ATTR_RO(version);
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static ssize_t build_revision_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return get_info(dev, buf, CMD_GET_EC_REV);
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}
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static DEVICE_ATTR_RO(build_revision);
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static ssize_t build_date_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return get_info(dev, buf, CMD_GET_EC_BUILD_DATE);
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}
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static DEVICE_ATTR_RO(build_date);
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static ssize_t model_number_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return get_info(dev, buf, CMD_GET_EC_MODEL);
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}
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static DEVICE_ATTR_RO(model_number);
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static struct attribute *wilco_dev_attrs[] = {
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&dev_attr_boot_on_ac.attr,
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&dev_attr_build_date.attr,
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&dev_attr_build_revision.attr,
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&dev_attr_model_number.attr,
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&dev_attr_version.attr,
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NULL,
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};
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static struct attribute_group wilco_dev_attr_group = {
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.attrs = wilco_dev_attrs,
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};
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int wilco_ec_add_sysfs(struct wilco_ec_device *ec)
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{
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return sysfs_create_group(&ec->dev->kobj, &wilco_dev_attr_group);
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}
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void wilco_ec_remove_sysfs(struct wilco_ec_device *ec)
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{
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sysfs_remove_group(&ec->dev->kobj, &wilco_dev_attr_group);
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}
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