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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/platform/chrome/cros_ec_sysfs.c
....@@ -1,38 +1,24 @@
1
-/*
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- * cros_ec_sysfs - expose the Chrome OS EC through sysfs
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- *
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- * Copyright (C) 2014 Google, Inc.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program. If not, see <http://www.gnu.org/licenses/>.
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- */
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-
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-#define pr_fmt(fmt) "cros_ec_sysfs: " fmt
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+// SPDX-License-Identifier: GPL-2.0+
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+// Expose the ChromeOS EC through sysfs
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+//
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+// Copyright (C) 2014 Google, Inc.
215 
226 #include <linux/ctype.h>
237 #include <linux/delay.h>
248 #include <linux/device.h>
259 #include <linux/fs.h>
2610 #include <linux/kobject.h>
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-#include <linux/mfd/cros_ec.h>
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-#include <linux/mfd/cros_ec_commands.h>
2911 #include <linux/module.h>
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+#include <linux/platform_data/cros_ec_commands.h>
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+#include <linux/platform_data/cros_ec_proto.h>
3014 #include <linux/platform_device.h>
3115 #include <linux/printk.h>
3216 #include <linux/slab.h>
3317 #include <linux/stat.h>
3418 #include <linux/types.h>
3519 #include <linux/uaccess.h>
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+
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+#define DRV_NAME "cros-ec-sysfs"
3622 
3723 /* Accessor functions */
3824 
....@@ -163,14 +149,12 @@
163149 	/* Get build info. */
164150 	msg->command = EC_CMD_GET_BUILD_INFO + ec->cmd_offset;
165151 	msg->insize = EC_HOST_PARAM_SIZE;
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-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
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-	if (ret < 0)
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+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
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+	if (ret < 0) {
168154 		count += scnprintf(buf + count, PAGE_SIZE - count,
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-				   "Build info:    XFER ERROR %d\n", ret);
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-	else if (msg->result != EC_RES_SUCCESS)
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-		count += scnprintf(buf + count, PAGE_SIZE - count,
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-				   "Build info:    EC error %d\n", msg->result);
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-	else {
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+				   "Build info:    XFER / EC ERROR %d / %d\n",
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+				   ret, msg->result);
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+	} else {
174158 		msg->data[EC_HOST_PARAM_SIZE - 1] = '\0';
175159 		count += scnprintf(buf + count, PAGE_SIZE - count,
176160 				   "Build info:    %s\n", msg->data);
....@@ -179,14 +163,12 @@
179163 	/* Get chip info. */
180164 	msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset;
181165 	msg->insize = sizeof(*r_chip);
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-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
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-	if (ret < 0)
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+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
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+	if (ret < 0) {
184168 		count += scnprintf(buf + count, PAGE_SIZE - count,
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-				   "Chip info:     XFER ERROR %d\n", ret);
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-	else if (msg->result != EC_RES_SUCCESS)
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-		count += scnprintf(buf + count, PAGE_SIZE - count,
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-				   "Chip info:     EC error %d\n", msg->result);
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-	else {
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+				   "Chip info:     XFER / EC ERROR %d / %d\n",
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+				   ret, msg->result);
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+	} else {
190172 		r_chip = (struct ec_response_get_chip_info *)msg->data;
191173 
192174 		r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0';
....@@ -203,14 +185,12 @@
203185 	/* Get board version */
204186 	msg->command = EC_CMD_GET_BOARD_VERSION + ec->cmd_offset;
205187 	msg->insize = sizeof(*r_board);
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-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
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-	if (ret < 0)
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+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
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+	if (ret < 0) {
208190 		count += scnprintf(buf + count, PAGE_SIZE - count,
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-				   "Board version: XFER ERROR %d\n", ret);
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-	else if (msg->result != EC_RES_SUCCESS)
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-		count += scnprintf(buf + count, PAGE_SIZE - count,
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-				   "Board version: EC error %d\n", msg->result);
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-	else {
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+				   "Board version: XFER / EC ERROR %d / %d\n",
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+				   ret, msg->result);
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+	} else {
214194 		r_board = (struct ec_response_board_version *)msg->data;
215195 
216196 		count += scnprintf(buf + count, PAGE_SIZE - count,
....@@ -340,7 +320,7 @@
340320 static umode_t cros_ec_ctrl_visible(struct kobject *kobj,
341321 				    struct attribute *a, int n)
342322 {
343
-	struct device *dev = container_of(kobj, struct device, kobj);
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+	struct device *dev = kobj_to_dev(kobj);
344324 	struct cros_ec_dev *ec = to_cros_ec_dev(dev);
345325 
346326 	if (a == &dev_attr_kb_wake_angle.attr && !ec->has_kb_wake_angle)
....@@ -349,11 +329,43 @@
349329 	return a->mode;
350330 }
351331 
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-struct attribute_group cros_ec_attr_group = {
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+static struct attribute_group cros_ec_attr_group = {
353333 	.attrs = __ec_attrs,
354334 	.is_visible = cros_ec_ctrl_visible,
355335 };
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-EXPORT_SYMBOL(cros_ec_attr_group);
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+
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+static int cros_ec_sysfs_probe(struct platform_device *pd)
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+{
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+	struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
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+	struct device *dev = &pd->dev;
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+	int ret;
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+
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+	ret = sysfs_create_group(&ec_dev->class_dev.kobj, &cros_ec_attr_group);
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+	if (ret < 0)
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+		dev_err(dev, "failed to create attributes. err=%d\n", ret);
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+
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+	return ret;
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+}
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+
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+static int cros_ec_sysfs_remove(struct platform_device *pd)
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+{
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+	struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
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+
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+	sysfs_remove_group(&ec_dev->class_dev.kobj, &cros_ec_attr_group);
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+
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+	return 0;
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+}
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+
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+static struct platform_driver cros_ec_sysfs_driver = {
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+	.driver = {
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+		.name = DRV_NAME,
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+	},
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+	.probe = cros_ec_sysfs_probe,
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+	.remove = cros_ec_sysfs_remove,
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+};
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+
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+module_platform_driver(cros_ec_sysfs_driver);
357368 
358369 MODULE_LICENSE("GPL");
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-MODULE_DESCRIPTION("ChromeOS EC control driver");
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+MODULE_DESCRIPTION("Expose the ChromeOS EC through sysfs");
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+MODULE_ALIAS("platform:" DRV_NAME);