forked from Minki/linux
75a6faf617
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 101 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190113.822954939@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
169 lines
4.6 KiB
C
169 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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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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/*
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* The reference taken to the parent's node which will be balanced on
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* reprobe or on platform-device release.
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*/
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device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
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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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MODULE_DEVICE_TABLE(platform, max77620_thermal_devtype);
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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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