Commit 4c1ca625 authored by Nick Crews's avatar Nick Crews Committed by Enric Balletbo i Serra
Browse files

platform/chrome: wilco_ec: Add Boot on AC support 



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.

Signed-off-by: default avatarNick Crews <ncrews@chromium.org>
Signed-off-by: default avatarEnric Balletbo i Serra <enric.balletbo@collabora.com>
parent 0c0b7ea2

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

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+9 −0
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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

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@@ -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

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@@ -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 */