129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/*
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* dptf_power: DPTF platform power driver
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* Copyright (c) 2016, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/acpi.h>
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#include <linux/platform_device.h>
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/*
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* Presentation of attributes which are defined for INT3407. They are:
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* PMAX : Maximum platform powe
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* PSRC : Platform power source
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* ARTG : Adapter rating
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* CTYP : Charger type
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* PBSS : Battery steady power
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*/
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#define DPTF_POWER_SHOW(name, object) \
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static ssize_t name##_show(struct device *dev,\
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struct device_attribute *attr,\
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char *buf)\
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{\
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struct platform_device *pdev = to_platform_device(dev);\
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struct acpi_device *acpi_dev = platform_get_drvdata(pdev);\
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unsigned long long val;\
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acpi_status status;\
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\
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status = acpi_evaluate_integer(acpi_dev->handle, #object,\
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NULL, &val);\
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if (ACPI_SUCCESS(status))\
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return sprintf(buf, "%d\n", (int)val);\
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else \
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return -EINVAL;\
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}
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DPTF_POWER_SHOW(max_platform_power_mw, PMAX)
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DPTF_POWER_SHOW(platform_power_source, PSRC)
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DPTF_POWER_SHOW(adapter_rating_mw, ARTG)
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DPTF_POWER_SHOW(battery_steady_power_mw, PBSS)
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DPTF_POWER_SHOW(charger_type, CTYP)
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static DEVICE_ATTR_RO(max_platform_power_mw);
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static DEVICE_ATTR_RO(platform_power_source);
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static DEVICE_ATTR_RO(adapter_rating_mw);
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static DEVICE_ATTR_RO(battery_steady_power_mw);
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static DEVICE_ATTR_RO(charger_type);
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static struct attribute *dptf_power_attrs[] = {
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&dev_attr_max_platform_power_mw.attr,
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&dev_attr_platform_power_source.attr,
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&dev_attr_adapter_rating_mw.attr,
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&dev_attr_battery_steady_power_mw.attr,
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&dev_attr_charger_type.attr,
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NULL
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};
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static struct attribute_group dptf_power_attribute_group = {
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.attrs = dptf_power_attrs,
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.name = "dptf_power"
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};
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static int dptf_power_add(struct platform_device *pdev)
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{
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struct acpi_device *acpi_dev;
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acpi_status status;
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unsigned long long ptype;
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int result;
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acpi_dev = ACPI_COMPANION(&(pdev->dev));
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if (!acpi_dev)
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return -ENODEV;
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status = acpi_evaluate_integer(acpi_dev->handle, "PTYP", NULL, &ptype);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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if (ptype != 0x11)
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return -ENODEV;
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result = sysfs_create_group(&pdev->dev.kobj,
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&dptf_power_attribute_group);
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if (result)
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return result;
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platform_set_drvdata(pdev, acpi_dev);
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return 0;
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}
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static int dptf_power_remove(struct platform_device *pdev)
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{
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sysfs_remove_group(&pdev->dev.kobj, &dptf_power_attribute_group);
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return 0;
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}
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static const struct acpi_device_id int3407_device_ids[] = {
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{"INT3407", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, int3407_device_ids);
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static struct platform_driver dptf_power_driver = {
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.probe = dptf_power_add,
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.remove = dptf_power_remove,
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.driver = {
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.name = "DPTF Platform Power",
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.acpi_match_table = int3407_device_ids,
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},
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};
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module_platform_driver(dptf_power_driver);
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MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("ACPI DPTF platform power driver");
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