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// SPDX-License-Identifier: GPL-2.0-only
/*
* dptf_power: DPTF platform power driver
* Copyright (c) 2016, Intel Corporation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
/*
* Presentation of attributes which are defined for INT3407. They are:
* PMAX : Maximum platform powe
* PSRC : Platform power source
* ARTG : Adapter rating
* CTYP : Charger type
* PBSS : Battery steady power
* PROP : Rest of worst case platform Power
*/
#define DPTF_POWER_SHOW(name, object) \
static ssize_t name##_show(struct device *dev,\
struct device_attribute *attr,\
char *buf)\
{\
struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
unsigned long long val;\
acpi_status status;\
\
status = acpi_evaluate_integer(acpi_dev->handle, #object,\
NULL, &val);\
if (ACPI_SUCCESS(status))\
return sprintf(buf, "%d\n", (int)val);\
else \
return -EINVAL;\
}
DPTF_POWER_SHOW(max_platform_power_mw, PMAX)
DPTF_POWER_SHOW(platform_power_source, PSRC)
DPTF_POWER_SHOW(adapter_rating_mw, ARTG)
DPTF_POWER_SHOW(battery_steady_power_mw, PBSS)
DPTF_POWER_SHOW(charger_type, CTYP)
DPTF_POWER_SHOW(rest_of_platform_power_mw, PROP)
static DEVICE_ATTR_RO(max_platform_power_mw);
static DEVICE_ATTR_RO(platform_power_source);
static DEVICE_ATTR_RO(adapter_rating_mw);
static DEVICE_ATTR_RO(battery_steady_power_mw);
static DEVICE_ATTR_RO(charger_type);
static DEVICE_ATTR_RO(rest_of_platform_power_mw);
static ssize_t prochot_confirm_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_device *acpi_dev = dev_get_drvdata(dev);
acpi_status status;
int seq_no;
if (kstrtouint(buf, 0, &seq_no) < 0)
return -EINVAL;
status = acpi_execute_simple_method(acpi_dev->handle, "PBOK", seq_no);
if (ACPI_SUCCESS(status))
return count;
return -EINVAL;
}
static DEVICE_ATTR_WO(prochot_confirm);
static struct attribute *dptf_power_attrs[] = {
&dev_attr_max_platform_power_mw.attr,
&dev_attr_platform_power_source.attr,
&dev_attr_adapter_rating_mw.attr,
&dev_attr_battery_steady_power_mw.attr,
&dev_attr_charger_type.attr,
&dev_attr_rest_of_platform_power_mw.attr,
&dev_attr_prochot_confirm.attr,
NULL
};
static const struct attribute_group dptf_power_attribute_group = {
.attrs = dptf_power_attrs,
.name = "dptf_power"
};
#define POWER_STATE_CHANGED 0x81
#define POWER_PROP_CHANGE_EVENT 0x84
static void dptf_power_notify(acpi_handle handle, u32 event, void *data)
{
struct platform_device *pdev = data;
char *attr;
switch (event) {
case POWER_STATE_CHANGED:
attr = "platform_power_source";
break;
case POWER_PROP_CHANGE_EVENT:
attr = "rest_of_platform_power_mw";
break;
default:
dev_err(&pdev->dev, "Unsupported event [0x%x]\n", event);
return;
}
/*
* Notify that an attribute is changed, so that user space can read
* again.
*/
sysfs_notify(&pdev->dev.kobj, "dptf_power", attr);
}
static int dptf_power_add(struct platform_device *pdev)
{
struct acpi_device *acpi_dev;
acpi_status status;
unsigned long long ptype;
int result;
acpi_dev = ACPI_COMPANION(&(pdev->dev));
if (!acpi_dev)
return -ENODEV;
status = acpi_evaluate_integer(acpi_dev->handle, "PTYP", NULL, &ptype);
if (ACPI_FAILURE(status))
return -ENODEV;
if (ptype != 0x11)
return -ENODEV;
result = acpi_install_notify_handler(acpi_dev->handle,
ACPI_DEVICE_NOTIFY,
dptf_power_notify,
(void *)pdev);
if (result)
return result;
result = sysfs_create_group(&pdev->dev.kobj,
&dptf_power_attribute_group);
if (result) {
acpi_remove_notify_handler(acpi_dev->handle,
ACPI_DEVICE_NOTIFY,
dptf_power_notify);
return result;
}
platform_set_drvdata(pdev, acpi_dev);
return 0;
}
static int dptf_power_remove(struct platform_device *pdev)
{
struct acpi_device *acpi_dev = platform_get_drvdata(pdev);
acpi_remove_notify_handler(acpi_dev->handle,
ACPI_DEVICE_NOTIFY,
dptf_power_notify);
sysfs_remove_group(&pdev->dev.kobj, &dptf_power_attribute_group);
return 0;
}
static const struct acpi_device_id int3407_device_ids[] = {
{"INT3407", 0},
{"INTC1047", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, int3407_device_ids);
static struct platform_driver dptf_power_driver = {
.probe = dptf_power_add,
.remove = dptf_power_remove,
.driver = {
.name = "DPTF Platform Power",
.acpi_match_table = int3407_device_ids,
},
};
module_platform_driver(dptf_power_driver);
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ACPI DPTF platform power driver");
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