From 072de836f53be56a70cecf70b43ae43b7ce17376 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 10:08:36 +0000
Subject: [PATCH] mk-rootfs.sh
---
kernel/drivers/platform/chrome/cros_ec_lightbar.c | 210 +++++++++++++++++++++++++---------------------------
1 files changed, 102 insertions(+), 108 deletions(-)
diff --git a/kernel/drivers/platform/chrome/cros_ec_lightbar.c b/kernel/drivers/platform/chrome/cros_ec_lightbar.c
index 68193bb..de8dfb1 100644
--- a/kernel/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/kernel/drivers/platform/chrome/cros_ec_lightbar.c
@@ -1,37 +1,23 @@
-/*
- * cros_ec_lightbar - expose the Chromebook Pixel lightbar to userspace
- *
- * Copyright (C) 2014 Google, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#define pr_fmt(fmt) "cros_ec_lightbar: " fmt
+// SPDX-License-Identifier: GPL-2.0+
+// Expose the Chromebook Pixel lightbar to userspace
+//
+// Copyright (C) 2014 Google, Inc.
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/kobject.h>
-#include <linux/mfd/cros_ec.h>
-#include <linux/mfd/cros_ec_commands.h>
#include <linux/module.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_data/cros_ec_proto.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
+
+#define DRV_NAME "cros-ec-lightbar"
/* Rate-limit the lightbar interface to prevent DoS. */
static unsigned long lb_interval_jiffies = 50 * HZ / 1000;
@@ -41,7 +27,6 @@
* If this is true, we won't do anything during suspend/resume.
*/
static bool userspace_control;
-static struct cros_ec_dev *ec_with_lightbar;
static ssize_t interval_msec_show(struct device *dev,
struct device_attribute *attr, char *buf)
@@ -131,8 +116,10 @@
param = (struct ec_params_lightbar *)msg->data;
param->cmd = LIGHTBAR_CMD_VERSION;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
- if (ret < 0) {
+ msg->outsize = sizeof(param->cmd);
+ msg->result = sizeof(resp->version);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+ if (ret < 0 && ret != -EINVAL) {
ret = 0;
goto exit;
}
@@ -208,14 +195,9 @@
if (ret)
goto exit;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto exit;
-
- if (msg->result != EC_RES_SUCCESS) {
- ret = -EINVAL;
- goto exit;
- }
ret = count;
exit:
@@ -273,11 +255,8 @@
goto exit;
}
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
- goto exit;
-
- if (msg->result != EC_RES_SUCCESS)
goto exit;
i = 0;
@@ -320,13 +299,10 @@
if (ret)
goto exit;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
- if (ret < 0)
- goto exit;
-
- if (msg->result != EC_RES_SUCCESS) {
- ret = scnprintf(buf, PAGE_SIZE,
- "ERROR: EC returned %d\n", msg->result);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+ if (ret < 0) {
+ ret = scnprintf(buf, PAGE_SIZE, "XFER / EC ERROR %d / %d\n",
+ ret, msg->result);
goto exit;
}
@@ -359,13 +335,10 @@
if (ret)
goto error;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto error;
- if (msg->result != EC_RES_SUCCESS) {
- ret = -EINVAL;
- goto error;
- }
+
ret = 0;
error:
kfree(msg);
@@ -373,14 +346,11 @@
return ret;
}
-int lb_manual_suspend_ctrl(struct cros_ec_dev *ec, uint8_t enable)
+static int lb_manual_suspend_ctrl(struct cros_ec_dev *ec, uint8_t enable)
{
struct ec_params_lightbar *param;
struct cros_ec_command *msg;
int ret;
-
- if (ec != ec_with_lightbar)
- return 0;
msg = alloc_lightbar_cmd_msg(ec);
if (!msg)
@@ -395,38 +365,16 @@
if (ret)
goto error;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto error;
- if (msg->result != EC_RES_SUCCESS) {
- ret = -EINVAL;
- goto error;
- }
+
ret = 0;
error:
kfree(msg);
return ret;
}
-EXPORT_SYMBOL(lb_manual_suspend_ctrl);
-
-int lb_suspend(struct cros_ec_dev *ec)
-{
- if (userspace_control || ec != ec_with_lightbar)
- return 0;
-
- return lb_send_empty_cmd(ec, LIGHTBAR_CMD_SUSPEND);
-}
-EXPORT_SYMBOL(lb_suspend);
-
-int lb_resume(struct cros_ec_dev *ec)
-{
- if (userspace_control || ec != ec_with_lightbar)
- return 0;
-
- return lb_send_empty_cmd(ec, LIGHTBAR_CMD_RESUME);
-}
-EXPORT_SYMBOL(lb_resume);
static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
@@ -462,14 +410,9 @@
if (ret)
goto exit;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto exit;
-
- if (msg->result != EC_RES_SUCCESS) {
- ret = -EINVAL;
- goto exit;
- }
ret = count;
exit:
@@ -524,13 +467,9 @@
*/
msg->outsize = count + extra_bytes;
- ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0)
goto exit;
- if (msg->result != EC_RES_SUCCESS) {
- ret = -EINVAL;
- goto exit;
- }
ret = count;
exit:
@@ -584,36 +523,91 @@
NULL,
};
-bool ec_has_lightbar(struct cros_ec_dev *ec)
+static struct attribute_group cros_ec_lightbar_attr_group = {
+ .name = "lightbar",
+ .attrs = __lb_cmds_attrs,
+};
+
+static int cros_ec_lightbar_probe(struct platform_device *pd)
{
- return !!get_lightbar_version(ec, NULL, NULL);
+ struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
+ struct cros_ec_platform *pdata = dev_get_platdata(ec_dev->dev);
+ struct device *dev = &pd->dev;
+ int ret;
+
+ /*
+ * Only instantiate the lightbar if the EC name is 'cros_ec'. Other EC
+ * devices like 'cros_pd' doesn't have a lightbar.
+ */
+ if (strcmp(pdata->ec_name, CROS_EC_DEV_NAME) != 0)
+ return -ENODEV;
+
+ /*
+ * Ask then for the lightbar version, if it's 0 then the 'cros_ec'
+ * doesn't have a lightbar.
+ */
+ if (!get_lightbar_version(ec_dev, NULL, NULL))
+ return -ENODEV;
+
+ /* Take control of the lightbar from the EC. */
+ lb_manual_suspend_ctrl(ec_dev, 1);
+
+ ret = sysfs_create_group(&ec_dev->class_dev.kobj,
+ &cros_ec_lightbar_attr_group);
+ if (ret < 0)
+ dev_err(dev, "failed to create %s attributes. err=%d\n",
+ cros_ec_lightbar_attr_group.name, ret);
+
+ return ret;
}
-static umode_t cros_ec_lightbar_attrs_are_visible(struct kobject *kobj,
- struct attribute *a, int n)
+static int cros_ec_lightbar_remove(struct platform_device *pd)
{
- struct device *dev = container_of(kobj, struct device, kobj);
- struct cros_ec_dev *ec = to_cros_ec_dev(dev);
- struct platform_device *pdev = to_platform_device(ec->dev);
- struct cros_ec_platform *pdata = pdev->dev.platform_data;
- int is_cros_ec;
+ struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
- is_cros_ec = strcmp(pdata->ec_name, CROS_EC_DEV_NAME);
+ sysfs_remove_group(&ec_dev->class_dev.kobj,
+ &cros_ec_lightbar_attr_group);
- if (is_cros_ec != 0)
- return 0;
+ /* Let the EC take over the lightbar again. */
+ lb_manual_suspend_ctrl(ec_dev, 0);
- /* Only instantiate this stuff if the EC has a lightbar */
- if (ec_has_lightbar(ec)) {
- ec_with_lightbar = ec;
- return a->mode;
- }
return 0;
}
-struct attribute_group cros_ec_lightbar_attr_group = {
- .name = "lightbar",
- .attrs = __lb_cmds_attrs,
- .is_visible = cros_ec_lightbar_attrs_are_visible,
+static int __maybe_unused cros_ec_lightbar_resume(struct device *dev)
+{
+ struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
+
+ if (userspace_control)
+ return 0;
+
+ return lb_send_empty_cmd(ec_dev, LIGHTBAR_CMD_RESUME);
+}
+
+static int __maybe_unused cros_ec_lightbar_suspend(struct device *dev)
+{
+ struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
+
+ if (userspace_control)
+ return 0;
+
+ return lb_send_empty_cmd(ec_dev, LIGHTBAR_CMD_SUSPEND);
+}
+
+static SIMPLE_DEV_PM_OPS(cros_ec_lightbar_pm_ops,
+ cros_ec_lightbar_suspend, cros_ec_lightbar_resume);
+
+static struct platform_driver cros_ec_lightbar_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .pm = &cros_ec_lightbar_pm_ops,
+ },
+ .probe = cros_ec_lightbar_probe,
+ .remove = cros_ec_lightbar_remove,
};
-EXPORT_SYMBOL(cros_ec_lightbar_attr_group);
+
+module_platform_driver(cros_ec_lightbar_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Expose the Chromebook Pixel's lightbar to userspace");
+MODULE_ALIAS("platform:" DRV_NAME);
--
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