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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Junction temperature thermal driver for Maxim Max77620.4 *5 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.6 *7 * Author: Laxman Dewangan <ldewangan@nvidia.com>8 * Mallikarjun Kasoju <mkasoju@nvidia.com>9 */10 11#include <linux/irq.h>12#include <linux/interrupt.h>13#include <linux/mfd/max77620.h>14#include <linux/module.h>15#include <linux/of.h>16#include <linux/platform_device.h>17#include <linux/regmap.h>18#include <linux/slab.h>19#include <linux/thermal.h>20 21#define MAX77620_NORMAL_OPERATING_TEMP 10000022#define MAX77620_TJALARM1_TEMP 12000023#define MAX77620_TJALARM2_TEMP 14000024 25struct max77620_therm_info {26 struct device *dev;27 struct regmap *rmap;28 struct thermal_zone_device *tz_device;29 int irq_tjalarm1;30 int irq_tjalarm2;31};32 33/**34 * max77620_thermal_read_temp: Read PMIC die temperatue.35 * @data: Device specific data.36 * @temp: Temperature in millidegrees Celsius37 *38 * The actual temperature of PMIC die is not available from PMIC.39 * PMIC only tells the status if it has crossed or not the threshold level40 * of 120degC or 140degC.41 * If threshold has not been crossed then assume die temperature as 100degC42 * else 120degC or 140deG based on the PMIC die temp threshold status.43 *44 * Return 0 on success otherwise error number to show reason of failure.45 */46 47static int max77620_thermal_read_temp(struct thermal_zone_device *tz, int *temp)48{49 struct max77620_therm_info *mtherm = thermal_zone_device_priv(tz);50 unsigned int val;51 int ret;52 53 ret = regmap_read(mtherm->rmap, MAX77620_REG_STATLBT, &val);54 if (ret < 0)55 return ret;56 57 if (val & MAX77620_IRQ_TJALRM2_MASK)58 *temp = MAX77620_TJALARM2_TEMP;59 else if (val & MAX77620_IRQ_TJALRM1_MASK)60 *temp = MAX77620_TJALARM1_TEMP;61 else62 *temp = MAX77620_NORMAL_OPERATING_TEMP;63 64 return 0;65}66 67static const struct thermal_zone_device_ops max77620_thermal_ops = {68 .get_temp = max77620_thermal_read_temp,69};70 71static irqreturn_t max77620_thermal_irq(int irq, void *data)72{73 struct max77620_therm_info *mtherm = data;74 75 if (irq == mtherm->irq_tjalarm1)76 dev_warn(mtherm->dev, "Junction Temp Alarm1(120C) occurred\n");77 else if (irq == mtherm->irq_tjalarm2)78 dev_crit(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n");79 80 thermal_zone_device_update(mtherm->tz_device,81 THERMAL_EVENT_UNSPECIFIED);82 83 return IRQ_HANDLED;84}85 86static int max77620_thermal_probe(struct platform_device *pdev)87{88 struct max77620_therm_info *mtherm;89 int ret;90 91 mtherm = devm_kzalloc(&pdev->dev, sizeof(*mtherm), GFP_KERNEL);92 if (!mtherm)93 return -ENOMEM;94 95 mtherm->irq_tjalarm1 = platform_get_irq(pdev, 0);96 mtherm->irq_tjalarm2 = platform_get_irq(pdev, 1);97 if ((mtherm->irq_tjalarm1 < 0) || (mtherm->irq_tjalarm2 < 0)) {98 dev_err(&pdev->dev, "Alarm irq number not available\n");99 return -EINVAL;100 }101 102 mtherm->dev = &pdev->dev;103 mtherm->rmap = dev_get_regmap(pdev->dev.parent, NULL);104 if (!mtherm->rmap) {105 dev_err(&pdev->dev, "Failed to get parent regmap\n");106 return -ENODEV;107 }108 109 /*110 * The reference taken to the parent's node which will be balanced on111 * reprobe or on platform-device release.112 */113 device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);114 115 mtherm->tz_device = devm_thermal_of_zone_register(&pdev->dev, 0,116 mtherm, &max77620_thermal_ops);117 if (IS_ERR(mtherm->tz_device))118 return PTR_ERR(mtherm->tz_device);119 120 ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm1, NULL,121 max77620_thermal_irq,122 IRQF_ONESHOT | IRQF_SHARED,123 dev_name(&pdev->dev), mtherm);124 if (ret < 0) {125 dev_err(&pdev->dev, "Failed to request irq1: %d\n", ret);126 return ret;127 }128 129 ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm2, NULL,130 max77620_thermal_irq,131 IRQF_ONESHOT | IRQF_SHARED,132 dev_name(&pdev->dev), mtherm);133 if (ret < 0) {134 dev_err(&pdev->dev, "Failed to request irq2: %d\n", ret);135 return ret;136 }137 138 return 0;139}140 141static struct platform_device_id max77620_thermal_devtype[] = {142 { .name = "max77620-thermal", },143 {},144};145MODULE_DEVICE_TABLE(platform, max77620_thermal_devtype);146 147static struct platform_driver max77620_thermal_driver = {148 .driver = {149 .name = "max77620-thermal",150 },151 .probe = max77620_thermal_probe,152 .id_table = max77620_thermal_devtype,153};154 155module_platform_driver(max77620_thermal_driver);156 157MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver");158MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");159MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>");160MODULE_LICENSE("GPL v2");161