mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
168 lines
4.6 KiB
168 lines
4.6 KiB
// 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 <[email protected]> |
|
* Mallikarjun Kasoju <[email protected]> |
|
*/ |
|
|
|
#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 <[email protected]>"); |
|
MODULE_AUTHOR("Mallikarjun Kasoju <[email protected]>"); |
|
MODULE_LICENSE("GPL v2");
|
|
|