mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
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>
168 lines
4.6 KiB
C
168 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Junction temperature thermal driver for Maxim Max77620.
|
|
*
|
|
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* Author: Laxman Dewangan <ldewangan@nvidia.com>
|
|
* Mallikarjun Kasoju <mkasoju@nvidia.com>
|
|
*/
|
|
|
|
#include <linux/irq.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/mfd/max77620.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/thermal.h>
|
|
|
|
#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,
|
|
THERMAL_EVENT_UNSPECIFIED);
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* The reference taken to the parent's node which will be balanced on
|
|
* reprobe or on platform-device release.
|
|
*/
|
|
device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
|
|
|
|
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", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, max77620_thermal_devtype);
|
|
|
|
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 <ldewangan@nvidia.com>");
|
|
MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>");
|
|
MODULE_LICENSE("GPL v2");
|