257 lines
6.5 KiB
C
257 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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 and INT3532.
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* They are:
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* PMAX : Maximum platform power
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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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* PROP : Rest of worst case platform Power
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* PBSS : Power Battery Steady State
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* RBHF : High Frequency Impedance
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* VBNL : Instantaneous No-Load Voltage
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* CMPP : Current Discharge Capability
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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 acpi_device *acpi_dev = dev_get_drvdata(dev);\
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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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DPTF_POWER_SHOW(rest_of_platform_power_mw, PROP)
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DPTF_POWER_SHOW(max_steady_state_power_mw, PBSS)
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DPTF_POWER_SHOW(high_freq_impedance_mohm, RBHF)
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DPTF_POWER_SHOW(no_load_voltage_mv, VBNL)
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DPTF_POWER_SHOW(current_discharge_capbility_ma, CMPP);
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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 DEVICE_ATTR_RO(rest_of_platform_power_mw);
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static DEVICE_ATTR_RO(max_steady_state_power_mw);
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static DEVICE_ATTR_RO(high_freq_impedance_mohm);
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static DEVICE_ATTR_RO(no_load_voltage_mv);
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static DEVICE_ATTR_RO(current_discharge_capbility_ma);
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static ssize_t prochot_confirm_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct acpi_device *acpi_dev = dev_get_drvdata(dev);
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acpi_status status;
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int seq_no;
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if (kstrtouint(buf, 0, &seq_no) < 0)
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return -EINVAL;
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status = acpi_execute_simple_method(acpi_dev->handle, "PBOK", seq_no);
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if (ACPI_SUCCESS(status))
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return count;
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return -EINVAL;
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}
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static DEVICE_ATTR_WO(prochot_confirm);
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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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&dev_attr_rest_of_platform_power_mw.attr,
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&dev_attr_prochot_confirm.attr,
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NULL
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};
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static const 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 struct attribute *dptf_battery_attrs[] = {
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&dev_attr_max_platform_power_mw.attr,
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&dev_attr_max_steady_state_power_mw.attr,
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&dev_attr_high_freq_impedance_mohm.attr,
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&dev_attr_no_load_voltage_mv.attr,
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&dev_attr_current_discharge_capbility_ma.attr,
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NULL
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};
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static const struct attribute_group dptf_battery_attribute_group = {
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.attrs = dptf_battery_attrs,
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.name = "dptf_battery"
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};
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#define MAX_POWER_CHANGED 0x80
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#define POWER_STATE_CHANGED 0x81
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#define STEADY_STATE_POWER_CHANGED 0x83
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#define POWER_PROP_CHANGE_EVENT 0x84
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#define IMPEDANCE_CHANGED 0x85
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#define VOLTAGE_CURRENT_CHANGED 0x86
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static long long dptf_participant_type(acpi_handle handle)
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{
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unsigned long long ptype;
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acpi_status status;
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status = acpi_evaluate_integer(handle, "PTYP", NULL, &ptype);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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return ptype;
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}
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static void dptf_power_notify(acpi_handle handle, u32 event, void *data)
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{
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struct platform_device *pdev = data;
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char *attr;
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switch (event) {
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case POWER_STATE_CHANGED:
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attr = "platform_power_source";
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break;
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case POWER_PROP_CHANGE_EVENT:
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attr = "rest_of_platform_power_mw";
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break;
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case MAX_POWER_CHANGED:
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attr = "max_platform_power_mw";
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break;
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case STEADY_STATE_POWER_CHANGED:
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attr = "max_steady_state_power_mw";
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break;
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case IMPEDANCE_CHANGED:
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attr = "high_freq_impedance_mohm";
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break;
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case VOLTAGE_CURRENT_CHANGED:
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attr = "no_load_voltage_mv";
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break;
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default:
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dev_err(&pdev->dev, "Unsupported event [0x%x]\n", event);
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return;
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}
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/*
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* Notify that an attribute is changed, so that user space can read
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* again.
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*/
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if (dptf_participant_type(handle) == 0x0CULL)
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sysfs_notify(&pdev->dev.kobj, "dptf_battery", attr);
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else
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sysfs_notify(&pdev->dev.kobj, "dptf_power", attr);
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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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const struct attribute_group *attr_group;
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struct acpi_device *acpi_dev;
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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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ptype = dptf_participant_type(acpi_dev->handle);
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if (ptype == 0x11)
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attr_group = &dptf_power_attribute_group;
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else if (ptype == 0x0C)
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attr_group = &dptf_battery_attribute_group;
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else
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return -ENODEV;
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result = acpi_install_notify_handler(acpi_dev->handle,
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ACPI_DEVICE_NOTIFY,
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dptf_power_notify,
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(void *)pdev);
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if (result)
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return result;
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result = sysfs_create_group(&pdev->dev.kobj,
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attr_group);
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if (result) {
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acpi_remove_notify_handler(acpi_dev->handle,
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ACPI_DEVICE_NOTIFY,
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dptf_power_notify);
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return result;
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}
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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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struct acpi_device *acpi_dev = platform_get_drvdata(pdev);
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acpi_remove_notify_handler(acpi_dev->handle,
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ACPI_DEVICE_NOTIFY,
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dptf_power_notify);
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if (dptf_participant_type(acpi_dev->handle) == 0x0CULL)
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sysfs_remove_group(&pdev->dev.kobj, &dptf_battery_attribute_group);
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else
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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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{"INT3532", 0},
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{"INTC1047", 0},
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{"INTC1050", 0},
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{"INTC1060", 0},
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{"INTC1061", 0},
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{"INTC1065", 0},
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{"INTC1066", 0},
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{"INTC10A4", 0},
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{"INTC10A5", 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_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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