/* * Junction temperature thermal driver for Maxim Max77620. * * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. * * Author: Laxman Dewangan * Mallikarjun Kasoju * * 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. */ #include #include #include #include #include #include #include #include #include #define MAX77620_NORMAL_OPERATING_TEMP 100000 #define MAX77620_TJALARM1_TEMP 120000 #define MAX77620_TJALARM2_TEMP 140000 struct max77620_therm_info { struct device *dev; struct regmap *rmap; struct thermal_zone_device *tz_device; int irq_tjalarm1; int irq_tjalarm2; }; /** * max77620_thermal_read_temp: Read PMIC die temperatue. * @data: Device specific data. * temp: Temperature in millidegrees Celsius * * The actual temperature of PMIC die is not available from PMIC. * PMIC only tells the status if it has crossed or not the threshold level * of 120degC or 140degC. * If threshold has not been crossed then assume die temperature as 100degC * else 120degC or 140deG based on the PMIC die temp threshold status. * * Return 0 on success otherwise error number to show reason of failure. */ static int max77620_thermal_read_temp(void *data, int *temp) { struct max77620_therm_info *mtherm = data; unsigned int val; int ret; ret = regmap_read(mtherm->rmap, MAX77620_REG_STATLBT, &val); if (ret < 0) { dev_err(mtherm->dev, "Failed to read STATLBT: %d\n", ret); return ret; } if (val & MAX77620_IRQ_TJALRM2_MASK) *temp = MAX77620_TJALARM2_TEMP; else if (val & MAX77620_IRQ_TJALRM1_MASK) *temp = MAX77620_TJALARM1_TEMP; else *temp = MAX77620_NORMAL_OPERATING_TEMP; return 0; } static const struct thermal_zone_of_device_ops max77620_thermal_ops = { .get_temp = max77620_thermal_read_temp, }; static irqreturn_t max77620_thermal_irq(int irq, void *data) { struct max77620_therm_info *mtherm = data; if (irq == mtherm->irq_tjalarm1) dev_warn(mtherm->dev, "Junction Temp Alarm1(120C) occurred\n"); else if (irq == mtherm->irq_tjalarm2) dev_crit(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n"); thermal_zone_device_update(mtherm->tz_device); return IRQ_HANDLED; } static int max77620_thermal_probe(struct platform_device *pdev) { struct max77620_therm_info *mtherm; int ret; mtherm = devm_kzalloc(&pdev->dev, sizeof(*mtherm), GFP_KERNEL); if (!mtherm) return -ENOMEM; mtherm->irq_tjalarm1 = platform_get_irq(pdev, 0); mtherm->irq_tjalarm2 = platform_get_irq(pdev, 1); if ((mtherm->irq_tjalarm1 < 0) || (mtherm->irq_tjalarm2 < 0)) { dev_err(&pdev->dev, "Alarm irq number not available\n"); return -EINVAL; } pdev->dev.of_node = pdev->dev.parent->of_node; mtherm->dev = &pdev->dev; mtherm->rmap = dev_get_regmap(pdev->dev.parent, NULL); if (!mtherm->rmap) { dev_err(&pdev->dev, "Failed to get parent regmap\n"); return -ENODEV; } mtherm->tz_device = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, mtherm, &max77620_thermal_ops); if (IS_ERR(mtherm->tz_device)) { ret = PTR_ERR(mtherm->tz_device); dev_err(&pdev->dev, "Failed to register thermal zone: %d\n", ret); return ret; } ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm1, NULL, max77620_thermal_irq, IRQF_ONESHOT | IRQF_SHARED, dev_name(&pdev->dev), mtherm); if (ret < 0) { dev_err(&pdev->dev, "Failed to request irq1: %d\n", ret); return ret; } ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm2, NULL, max77620_thermal_irq, IRQF_ONESHOT | IRQF_SHARED, dev_name(&pdev->dev), mtherm); if (ret < 0) { dev_err(&pdev->dev, "Failed to request irq2: %d\n", ret); return ret; } platform_set_drvdata(pdev, mtherm); return 0; } static struct platform_device_id max77620_thermal_devtype[] = { { .name = "max77620-thermal", }, {}, }; static struct platform_driver max77620_thermal_driver = { .driver = { .name = "max77620-thermal", }, .probe = max77620_thermal_probe, .id_table = max77620_thermal_devtype, }; module_platform_driver(max77620_thermal_driver); MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver"); MODULE_AUTHOR("Laxman Dewangan "); MODULE_AUTHOR("Mallikarjun Kasoju "); MODULE_LICENSE("GPL v2");