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![Srinivas Pandruvada](/assets/img/avatar_default.png)
Added one additional parameter to thermal_zone_device_update() to provide caller with an optional capability to specify reason. Currently this event is used by user space governor to trigger different processing based on event code. Also it saves an additional call to read temperature when the event is received. The following events are cuurently defined: - Unspecified event - New temperature sample - Trip point violated - Trip point changed - thermal device up and down - thermal device power capability changed Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
/*
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* Junction temperature thermal driver for Maxim Max77620.
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*
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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*
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* Author: Laxman Dewangan <ldewangan@nvidia.com>
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* Mallikarjun Kasoju <mkasoju@nvidia.com>
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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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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/max77620.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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#define MAX77620_NORMAL_OPERATING_TEMP 100000
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#define MAX77620_TJALARM1_TEMP 120000
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#define MAX77620_TJALARM2_TEMP 140000
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struct max77620_therm_info {
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struct device *dev;
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struct regmap *rmap;
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struct thermal_zone_device *tz_device;
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int irq_tjalarm1;
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int irq_tjalarm2;
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};
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/**
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* max77620_thermal_read_temp: Read PMIC die temperatue.
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* @data: Device specific data.
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* temp: Temperature in millidegrees Celsius
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*
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* The actual temperature of PMIC die is not available from PMIC.
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* PMIC only tells the status if it has crossed or not the threshold level
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* of 120degC or 140degC.
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* If threshold has not been crossed then assume die temperature as 100degC
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* else 120degC or 140deG based on the PMIC die temp threshold status.
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*
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* Return 0 on success otherwise error number to show reason of failure.
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*/
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static int max77620_thermal_read_temp(void *data, int *temp)
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{
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struct max77620_therm_info *mtherm = data;
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unsigned int val;
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int ret;
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ret = regmap_read(mtherm->rmap, MAX77620_REG_STATLBT, &val);
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if (ret < 0) {
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dev_err(mtherm->dev, "Failed to read STATLBT: %d\n", ret);
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return ret;
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}
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if (val & MAX77620_IRQ_TJALRM2_MASK)
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*temp = MAX77620_TJALARM2_TEMP;
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else if (val & MAX77620_IRQ_TJALRM1_MASK)
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*temp = MAX77620_TJALARM1_TEMP;
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else
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*temp = MAX77620_NORMAL_OPERATING_TEMP;
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return 0;
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}
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static const struct thermal_zone_of_device_ops max77620_thermal_ops = {
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.get_temp = max77620_thermal_read_temp,
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};
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static irqreturn_t max77620_thermal_irq(int irq, void *data)
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{
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struct max77620_therm_info *mtherm = data;
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if (irq == mtherm->irq_tjalarm1)
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dev_warn(mtherm->dev, "Junction Temp Alarm1(120C) occurred\n");
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else if (irq == mtherm->irq_tjalarm2)
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dev_crit(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n");
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thermal_zone_device_update(mtherm->tz_device,
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THERMAL_EVENT_UNSPECIFIED);
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return IRQ_HANDLED;
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}
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static int max77620_thermal_probe(struct platform_device *pdev)
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{
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struct max77620_therm_info *mtherm;
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int ret;
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mtherm = devm_kzalloc(&pdev->dev, sizeof(*mtherm), GFP_KERNEL);
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if (!mtherm)
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return -ENOMEM;
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mtherm->irq_tjalarm1 = platform_get_irq(pdev, 0);
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mtherm->irq_tjalarm2 = platform_get_irq(pdev, 1);
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if ((mtherm->irq_tjalarm1 < 0) || (mtherm->irq_tjalarm2 < 0)) {
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dev_err(&pdev->dev, "Alarm irq number not available\n");
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return -EINVAL;
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}
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pdev->dev.of_node = pdev->dev.parent->of_node;
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mtherm->dev = &pdev->dev;
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mtherm->rmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!mtherm->rmap) {
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dev_err(&pdev->dev, "Failed to get parent regmap\n");
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return -ENODEV;
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}
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mtherm->tz_device = devm_thermal_zone_of_sensor_register(&pdev->dev, 0,
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mtherm, &max77620_thermal_ops);
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if (IS_ERR(mtherm->tz_device)) {
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ret = PTR_ERR(mtherm->tz_device);
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dev_err(&pdev->dev, "Failed to register thermal zone: %d\n",
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ret);
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return ret;
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}
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ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm1, NULL,
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max77620_thermal_irq,
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IRQF_ONESHOT | IRQF_SHARED,
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dev_name(&pdev->dev), mtherm);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to request irq1: %d\n", ret);
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return ret;
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}
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ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm2, NULL,
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max77620_thermal_irq,
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IRQF_ONESHOT | IRQF_SHARED,
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dev_name(&pdev->dev), mtherm);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to request irq2: %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, mtherm);
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return 0;
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}
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static struct platform_device_id max77620_thermal_devtype[] = {
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{ .name = "max77620-thermal", },
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{},
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};
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static struct platform_driver max77620_thermal_driver = {
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.driver = {
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.name = "max77620-thermal",
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},
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.probe = max77620_thermal_probe,
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.id_table = max77620_thermal_devtype,
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};
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module_platform_driver(max77620_thermal_driver);
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MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver");
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MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
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MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>");
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MODULE_LICENSE("GPL v2");
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