1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/platform/chrome/wilco_ec/sysfs.c b/drivers/platform/chrome/wilco_ec/sysfs.c
new file mode 100644
index 000000000000..3b86a21005d3
--- /dev/null
+++ b/drivers/platform/chrome/wilco_ec/sysfs.c
@@ -0,0 +1,156 @@
+// 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;
+
+#define CMD_EC_INFO			0x38
+enum get_ec_info_op {
+	CMD_GET_EC_LABEL	= 0,
+	CMD_GET_EC_REV		= 1,
+	CMD_GET_EC_MODEL	= 2,
+	CMD_GET_EC_BUILD_DATE	= 3,
+};
+
+struct get_ec_info_req {
+	u8 cmd;			/* Always CMD_EC_INFO */
+	u8 reserved;
+	u8 op;			/* One of enum get_ec_info_op */
+} __packed;
+
+struct get_ec_info_resp {
+	u8 reserved[2];
+	char value[9]; /* __nonstring: might not be null terminated */
+} __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 ssize_t get_info(struct device *dev, char *buf, enum get_ec_info_op op)
+{
+	struct wilco_ec_device *ec = dev_get_drvdata(dev);
+	struct get_ec_info_req req = { .cmd = CMD_EC_INFO, .op = op };
+	struct get_ec_info_resp resp;
+	int ret;
+
+	struct wilco_ec_message msg = {
+		.type = WILCO_EC_MSG_LEGACY,
+		.request_data = &req,
+		.request_size = sizeof(req),
+		.response_data = &resp,
+		.response_size = sizeof(resp),
+	};
+
+	ret = wilco_ec_mailbox(ec, &msg);
+	if (ret < 0)
+		return ret;
+
+	return scnprintf(buf, PAGE_SIZE, "%.*s\n", (int)sizeof(resp.value),
+			 (char *)&resp.value);
+}
+
+static ssize_t version_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	return get_info(dev, buf, CMD_GET_EC_LABEL);
+}
+
+static DEVICE_ATTR_RO(version);
+
+static ssize_t build_revision_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	return get_info(dev, buf, CMD_GET_EC_REV);
+}
+
+static DEVICE_ATTR_RO(build_revision);
+
+static ssize_t build_date_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	return get_info(dev, buf, CMD_GET_EC_BUILD_DATE);
+}
+
+static DEVICE_ATTR_RO(build_date);
+
+static ssize_t model_number_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	return get_info(dev, buf, CMD_GET_EC_MODEL);
+}
+
+static DEVICE_ATTR_RO(model_number);
+
+
+static struct attribute *wilco_dev_attrs[] = {
+	&dev_attr_boot_on_ac.attr,
+	&dev_attr_build_date.attr,
+	&dev_attr_build_revision.attr,
+	&dev_attr_model_number.attr,
+	&dev_attr_version.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);
+}