linux/drivers/thermal/db8500_thermal.c
Daniel Lezcano 311526b7e3 thermal/drivers/db8500: Use driver dev instead of tz->device
The db8500 driver uses the thermal zone device instead of the device
attached to it. In order to prevent the drivers to access the thermal
zone device structure, replace the thermal zone device by the driver
to show the debug message.

Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230307133735.90772-5-daniel.lezcano@linaro.org
2023-04-01 20:51:45 +02:00

244 lines
5.9 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* db8500_thermal.c - DB8500 Thermal Management Implementation
*
* Copyright (C) 2012 ST-Ericsson
* Copyright (C) 2012-2019 Linaro Ltd.
*
* Authors: Hongbo Zhang, Linus Walleij
*/
#include <linux/cpu_cooling.h>
#include <linux/interrupt.h>
#include <linux/mfd/dbx500-prcmu.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/thermal.h>
#define PRCMU_DEFAULT_MEASURE_TIME 0xFFF
#define PRCMU_DEFAULT_LOW_TEMP 0
/**
* db8500_thermal_points - the interpolation points that trigger
* interrupts
*/
static const unsigned long db8500_thermal_points[] = {
15000,
20000,
25000,
30000,
35000,
40000,
45000,
50000,
55000,
60000,
65000,
70000,
75000,
80000,
/*
* This is where things start to get really bad for the
* SoC and the thermal zones should be set up to trigger
* critical temperature at 85000 mC so we don't get above
* this point.
*/
85000,
90000,
95000,
100000,
};
struct db8500_thermal_zone {
struct thermal_zone_device *tz;
struct device *dev;
unsigned long interpolated_temp;
unsigned int cur_index;
};
/* Callback to get current temperature */
static int db8500_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
{
struct db8500_thermal_zone *th = thermal_zone_device_priv(tz);
/*
* TODO: There is no PRCMU interface to get temperature data currently,
* so a pseudo temperature is returned , it works for thermal framework
* and this will be fixed when the PRCMU interface is available.
*/
*temp = th->interpolated_temp;
return 0;
}
static const struct thermal_zone_device_ops thdev_ops = {
.get_temp = db8500_thermal_get_temp,
};
static void db8500_thermal_update_config(struct db8500_thermal_zone *th,
unsigned int idx,
unsigned long next_low,
unsigned long next_high)
{
prcmu_stop_temp_sense();
th->cur_index = idx;
th->interpolated_temp = (next_low + next_high)/2;
/*
* The PRCMU accept absolute temperatures in celsius so divide
* down the millicelsius with 1000
*/
prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
}
static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data)
{
struct db8500_thermal_zone *th = irq_data;
unsigned int idx = th->cur_index;
unsigned long next_low, next_high;
if (idx == 0)
/* Meaningless for thermal management, ignoring it */
return IRQ_HANDLED;
if (idx == 1) {
next_high = db8500_thermal_points[0];
next_low = PRCMU_DEFAULT_LOW_TEMP;
} else {
next_high = db8500_thermal_points[idx - 1];
next_low = db8500_thermal_points[idx - 2];
}
idx -= 1;
db8500_thermal_update_config(th, idx, next_low, next_high);
dev_dbg(th->dev,
"PRCMU set max %ld, min %ld\n", next_high, next_low);
thermal_zone_device_update(th->tz, THERMAL_EVENT_UNSPECIFIED);
return IRQ_HANDLED;
}
static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data)
{
struct db8500_thermal_zone *th = irq_data;
unsigned int idx = th->cur_index;
unsigned long next_low, next_high;
int num_points = ARRAY_SIZE(db8500_thermal_points);
if (idx < num_points - 1) {
next_high = db8500_thermal_points[idx+1];
next_low = db8500_thermal_points[idx];
idx += 1;
db8500_thermal_update_config(th, idx, next_low, next_high);
dev_dbg(th->dev,
"PRCMU set max %ld, min %ld\n", next_high, next_low);
} else if (idx == num_points - 1)
/* So we roof out 1 degree over the max point */
th->interpolated_temp = db8500_thermal_points[idx] + 1;
thermal_zone_device_update(th->tz, THERMAL_EVENT_UNSPECIFIED);
return IRQ_HANDLED;
}
static int db8500_thermal_probe(struct platform_device *pdev)
{
struct db8500_thermal_zone *th = NULL;
struct device *dev = &pdev->dev;
int low_irq, high_irq, ret = 0;
th = devm_kzalloc(dev, sizeof(*th), GFP_KERNEL);
if (!th)
return -ENOMEM;
th->dev = dev;
low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");
if (low_irq < 0)
return low_irq;
ret = devm_request_threaded_irq(dev, low_irq, NULL,
prcmu_low_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
"dbx500_temp_low", th);
if (ret < 0) {
dev_err(dev, "failed to allocate temp low irq\n");
return ret;
}
high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
if (high_irq < 0)
return high_irq;
ret = devm_request_threaded_irq(dev, high_irq, NULL,
prcmu_high_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
"dbx500_temp_high", th);
if (ret < 0) {
dev_err(dev, "failed to allocate temp high irq\n");
return ret;
}
/* register of thermal sensor and get info from DT */
th->tz = devm_thermal_of_zone_register(dev, 0, th, &thdev_ops);
if (IS_ERR(th->tz)) {
dev_err(dev, "register thermal zone sensor failed\n");
return PTR_ERR(th->tz);
}
dev_info(dev, "thermal zone sensor registered\n");
/* Start measuring at the lowest point */
db8500_thermal_update_config(th, 0, PRCMU_DEFAULT_LOW_TEMP,
db8500_thermal_points[0]);
platform_set_drvdata(pdev, th);
return 0;
}
static int db8500_thermal_suspend(struct platform_device *pdev,
pm_message_t state)
{
prcmu_stop_temp_sense();
return 0;
}
static int db8500_thermal_resume(struct platform_device *pdev)
{
struct db8500_thermal_zone *th = platform_get_drvdata(pdev);
/* Resume and start measuring at the lowest point */
db8500_thermal_update_config(th, 0, PRCMU_DEFAULT_LOW_TEMP,
db8500_thermal_points[0]);
return 0;
}
static const struct of_device_id db8500_thermal_match[] = {
{ .compatible = "stericsson,db8500-thermal" },
{},
};
MODULE_DEVICE_TABLE(of, db8500_thermal_match);
static struct platform_driver db8500_thermal_driver = {
.driver = {
.name = "db8500-thermal",
.of_match_table = of_match_ptr(db8500_thermal_match),
},
.probe = db8500_thermal_probe,
.suspend = db8500_thermal_suspend,
.resume = db8500_thermal_resume,
};
module_platform_driver(db8500_thermal_driver);
MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
MODULE_DESCRIPTION("DB8500 thermal driver");
MODULE_LICENSE("GPL");