platform/chrome: wilco_ec: Add Boot on AC support (4c1ca625) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-platform-wilco-ec

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		What: /sys/bus/platform/devices/GOOG000C\:00/boot_on_ac
		Date: April 2019
		KernelVersion: 5.3
		Description:
		Boot on AC is a policy which makes the device boot from S5
		when AC power is connected. This is useful for users who
		want to run their device headless or with a dock.

		Input should be parseable by kstrtou8() to 0 or 1.

drivers/platform/chrome/wilco_ec/Makefile

+1 −1

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		# SPDX-License-Identifier: GPL-2.0

		wilco_ec-objs := core.o mailbox.o properties.o
		wilco_ec-objs := core.o mailbox.o properties.o sysfs.o
		obj-$(CONFIG_WILCO_EC) += wilco_ec.o
		wilco_ec_debugfs-objs := debugfs.o
		obj-$(CONFIG_WILCO_EC_DEBUGFS) += wilco_ec_debugfs.o

drivers/platform/chrome/wilco_ec/core.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -89,8 +89,16 @@ static int wilco_ec_probe(struct platform_device *pdev)
		goto unregister_debugfs;
		}

		ret = wilco_ec_add_sysfs(ec);
		if (ret < 0) {
		dev_err(dev, "Failed to create sysfs entries: %d", ret);
		goto unregister_rtc;
		}

		return 0;

		unregister_rtc:
		platform_device_unregister(ec->rtc_pdev);
		unregister_debugfs:
		if (ec->debugfs_pdev)
		platform_device_unregister(ec->debugfs_pdev);
		@@ -102,6 +110,7 @@ static int wilco_ec_remove(struct platform_device *pdev)
		{
		struct wilco_ec_device *ec = platform_get_drvdata(pdev);

		wilco_ec_remove_sysfs(ec);
		platform_device_unregister(ec->rtc_pdev);
		if (ec->debugfs_pdev)
		platform_device_unregister(ec->debugfs_pdev);

drivers/platform/chrome/wilco_ec/sysfs.c

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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);
		}

include/linux/platform_data/wilco-ec.h

+12 −0

Original line number	Diff line number	Diff line
		@@ -194,4 +194,16 @@ int wilco_ec_get_byte_property(struct wilco_ec_device *ec, u32 property_id,
		int wilco_ec_set_byte_property(struct wilco_ec_device *ec, u32 property_id,
		u8 val);

		/**
		* wilco_ec_add_sysfs() - Create sysfs entries
		* @ec: Wilco EC device
		*
		* wilco_ec_remove_sysfs() needs to be called afterwards
		* to perform the necessary cleanup.
		*
		* Return: 0 on success or negative error code on failure.
		*/
		int wilco_ec_add_sysfs(struct wilco_ec_device *ec);
		void wilco_ec_remove_sysfs(struct wilco_ec_device *ec);

		#endif /* WILCO_EC_H */

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