- 根目录:
- drivers
- thermal
- db8500_thermal.c
/*
* db8500_thermal.c - DB8500 Thermal Management Implementation
*
* Copyright (C) 2012 ST-Ericsson
* Copyright (C) 2012 Linaro Ltd.
*
* Author: Hongbo Zhang <hongbo.zhang@linaro.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#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_data/db8500_thermal.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
struct db8500_thermal_zone {
struct thermal_zone_device *therm_dev;
struct mutex th_lock;
struct work_struct therm_work;
struct db8500_thsens_platform_data *trip_tab;
enum thermal_device_mode mode;
enum thermal_trend trend;
unsigned long cur_temp_pseudo;
unsigned int cur_index;
};
/* Local function to check if thermal zone matches cooling devices */
static int db8500_thermal_match_cdev(struct thermal_cooling_device *cdev,
struct db8500_trip_point *trip_point)
{
int i;
if (!strlen(cdev->type))
return -EINVAL;
for (i = 0; i < COOLING_DEV_MAX; i++) {
if (!strcmp(trip_point->cdev_name[i], cdev->type))
return 0;
}
return -ENODEV;
}
/* Callback to bind cooling device to thermal zone */
static int db8500_cdev_bind(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev)
{
struct db8500_thermal_zone *pzone = thermal->devdata;
struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
unsigned long max_state, upper, lower;
int i, ret = -EINVAL;
cdev->ops->get_max_state(cdev, &max_state);
for (i = 0; i < ptrips->num_trips; i++) {
if (db8500_thermal_match_cdev(cdev, &ptrips->trip_points[i]))
continue;
upper = lower = i > max_state ? max_state : i;
ret = thermal_zone_bind_cooling_device(thermal, i, cdev,
upper, lower, THERMAL_WEIGHT_DEFAULT);
dev_info(&cdev->device, "%s bind to %d: %d-%s\n", cdev->type,
i, ret, ret ? "fail" : "succeed");
}
return ret;
}
/* Callback to unbind cooling device from thermal zone */
static int db8500_cdev_unbind(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev)
{
struct db8500_thermal_zone *pzone = thermal->devdata;
struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
int i, ret = -EINVAL;
for (i = 0; i < ptrips->num_trips; i++) {
if (db8500_thermal_match_cdev(cdev, &ptrips->trip_points[i]))
continue;
ret = thermal_zone_unbind_cooling_device(thermal, i, cdev);
dev_info(&cdev->device, "%s unbind from %d: %s\n", cdev->type,
i, ret ? "fail" : "succeed");
}
return ret;
}
/* Callback to get current temperature */
static int db8500_sys_get_temp(struct thermal_zone_device *thermal, int *temp)
{
struct db8500_thermal_zone *pzone = thermal->devdata;
/*
* 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 = pzone->cur_temp_pseudo;
return 0;
}
/* Callback to get temperature changing trend */
static int db8500_sys_get_trend(struct thermal_zone_device *thermal,
int trip, enum thermal_trend *trend)
{
struct db8500_thermal_zone *pzone = thermal->devdata;
*trend = pzone->trend;
return 0;
}
/* Callback to get thermal zone mode */
static int db8500_sys_get_mode(struct thermal_zone_device *thermal,
enum thermal_device_mode *mode)
{
struct db8500_thermal_zone *pzone = thermal->devdata;
mutex_lock(&pzone->th_lock);
*mode = pzone->mode;
mutex_unlock(&pzone->th_lock);
return 0;
}
/* Callback to set thermal zone mode */
static int db8500_sys_set_mode(struct thermal_zone_device *thermal,
enum thermal_device_mode mode)
{
struct db8500_thermal_zone *pzone = thermal->devdata;
mutex_lock(&pzone->th_lock);
pzone->mode = mode;
if (mode == THERMAL_DEVICE_ENABLED)
schedule_work(&pzone->therm_work);
mutex_unlock(&pzone->th_lock);
return 0;
}
/* Callback to get trip point type */
static int db8500_sys_get_trip_type(struct thermal_zone_device *thermal,
int trip, enum thermal_trip_type *type)
{
struct db8500_thermal_zone *pzone = thermal->devdata;
struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
if (trip >= ptrips->num_trips)
return -EINVAL;
*type = ptrips->trip_points[trip].type;
return 0;
}
/* Callback to get trip point temperature */
static int db8500_sys_get_trip_temp(struct thermal_zone_device *thermal,
int trip, int *temp)
{
struct db8500_thermal_zone *pzone = thermal->devdata;
struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
if (trip >= ptrips->num_trips)
return -EINVAL;
*temp = ptrips->trip_points[trip].temp;
return 0;
}
/* Callback to get critical trip point temperature */
static int db8500_sys_get_crit_temp(struct thermal_zone_device *thermal,
int *temp)
{
struct db8500_thermal_zone *pzone = thermal->devdata;
struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
int i;
for (i = ptrips->num_trips - 1; i > 0; i--) {
if (ptrips->trip_points[i].type == THERMAL_TRIP_CRITICAL) {
*temp = ptrips->trip_points[i].temp;
return 0;
}
}
return -EINVAL;
}
static struct thermal_zone_device_ops thdev_ops = {
.bind = db8500_cdev_bind,
.unbind = db8500_cdev_unbind,
.get_temp = db8500_sys_get_temp,
.get_trend = db8500_sys_get_trend,
.get_mode = db8500_sys_get_mode,
.set_mode = db8500_sys_set_mode,
.get_trip_type = db8500_sys_get_trip_type,
.get_trip_temp = db8500_sys_get_trip_temp,
.get_crit_temp = db8500_sys_get_crit_temp,
};
static void db8500_thermal_update_config(struct db8500_thermal_zone *pzone,
unsigned int idx, enum thermal_trend trend,
unsigned long next_low, unsigned long next_high)
{
prcmu_stop_temp_sense();
pzone->cur_index = idx;
pzone->cur_temp_pseudo = (next_low + next_high)/2;
pzone->trend = trend;
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 *pzone = irq_data;
struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
unsigned int idx = pzone->cur_index;
unsigned long next_low, next_high;
if (unlikely(idx == 0))
/* Meaningless for thermal management, ignoring it */
return IRQ_HANDLED;
if (idx == 1) {
next_high = ptrips->trip_points[0].temp;
next_low = PRCMU_DEFAULT_LOW_TEMP;
} else {
next_high = ptrips->trip_points[idx-1].temp;
next_low = ptrips->trip_points[idx-2].temp;
}
idx -= 1;
db8500_thermal_update_config(pzone, idx, THERMAL_TREND_DROPPING,
next_low, next_high);
dev_dbg(&pzone->therm_dev->device,
"PRCMU set max %ld, min %ld\n", next_high, next_low);
schedule_work(&pzone->therm_work);
return IRQ_HANDLED;
}
static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data)
{
struct db8500_thermal_zone *pzone = irq_data;
struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
unsigned int idx = pzone->cur_index;
unsigned long next_low, next_high;
if (idx < ptrips->num_trips - 1) {
next_high = ptrips->trip_points[idx+1].temp;
next_low = ptrips->trip_points[idx].temp;
idx += 1;
db8500_thermal_update_config(pzone, idx, THERMAL_TREND_RAISING,
next_low, next_high);
dev_dbg(&pzone->therm_dev->device,
"PRCMU set max %ld, min %ld\n", next_high, next_low);
} else if (idx == ptrips->num_trips - 1)
pzone->cur_temp_pseudo = ptrips->trip_points[idx].temp + 1;
schedule_work(&pzone->therm_work);
return IRQ_HANDLED;
}
static void db8500_thermal_work(struct work_struct *work)
{
enum thermal_device_mode cur_mode;
struct db8500_thermal_zone *pzone;
pzone = container_of(work, struct db8500_thermal_zone, therm_work);
mutex_lock(&pzone->th_lock);
cur_mode = pzone->mode;
mutex_unlock(&pzone->th_lock);
if (cur_mode == THERMAL_DEVICE_DISABLED)
return;
thermal_zone_device_update(pzone->therm_dev);
dev_dbg(&pzone->therm_dev->device, "thermal work finished.\n");
}
#ifdef CONFIG_OF
static struct db8500_thsens_platform_data*
db8500_thermal_parse_dt(struct platform_device *pdev)
{
struct db8500_thsens_platform_data *ptrips;
struct device_node *np = pdev->dev.of_node;
char prop_name[32];
const char *tmp_str;
u32 tmp_data;
int i, j;
ptrips = devm_kzalloc(&pdev->dev, sizeof(*ptrips), GFP_KERNEL);
if (!ptrips)
return NULL;
if (of_property_read_u32(np, "num-trips", &tmp_data))
goto err_parse_dt;
if (tmp_data > THERMAL_MAX_TRIPS)
goto err_parse_dt;
ptrips->num_trips = tmp_data;
for (i = 0; i < ptrips->num_trips; i++) {
sprintf(prop_name, "trip%d-temp", i);
if (of_property_read_u32(np, prop_name, &tmp_data))
goto err_parse_dt;
ptrips->trip_points[i].temp = tmp_data;
sprintf(prop_name, "trip%d-type", i);
if (of_property_read_string(np, prop_name, &tmp_str))
goto err_parse_dt;
if (!strcmp(tmp_str, "active"))
ptrips->trip_points[i].type = THERMAL_TRIP_ACTIVE;
else if (!strcmp(tmp_str, "passive"))
ptrips->trip_points[i].type = THERMAL_TRIP_PASSIVE;
else if (!strcmp(tmp_str, "hot"))
ptrips->trip_points[i].type = THERMAL_TRIP_HOT;
else if (!strcmp(tmp_str, "critical"))
ptrips->trip_points[i].type = THERMAL_TRIP_CRITICAL;
else
goto err_parse_dt;
sprintf(prop_name, "trip%d-cdev-num", i);
if (of_property_read_u32(np, prop_name, &tmp_data))
goto err_parse_dt;
if (tmp_data > COOLING_DEV_MAX)
goto err_parse_dt;
for (j = 0; j < tmp_data; j++) {
sprintf(prop_name, "trip%d-cdev-name%d", i, j);
if (of_property_read_string(np, prop_name, &tmp_str))
goto err_parse_dt;
if (strlen(tmp_str) >= THERMAL_NAME_LENGTH)
goto err_parse_dt;
strcpy(ptrips->trip_points[i].cdev_name[j], tmp_str);
}
}
return ptrips;
err_parse_dt:
dev_err(&pdev->dev, "Parsing device tree data error.\n");
return NULL;
}
#else
static inline struct db8500_thsens_platform_data*
db8500_thermal_parse_dt(struct platform_device *pdev)
{
return NULL;
}
#endif
static int db8500_thermal_probe(struct platform_device *pdev)
{
struct db8500_thermal_zone *pzone = NULL;
struct db8500_thsens_platform_data *ptrips = NULL;
struct device_node *np = pdev->dev.of_node;
int low_irq, high_irq, ret = 0;
unsigned long dft_low, dft_high;
if (np)
ptrips = db8500_thermal_parse_dt(pdev);
else
ptrips = dev_get_platdata(&pdev->dev);
if (!ptrips)
return -EINVAL;
pzone = devm_kzalloc(&pdev->dev, sizeof(*pzone), GFP_KERNEL);
if (!pzone)
return -ENOMEM;
mutex_init(&pzone->th_lock);
mutex_lock(&pzone->th_lock);
pzone->mode = THERMAL_DEVICE_DISABLED;
pzone->trip_tab = ptrips;
INIT_WORK(&pzone->therm_work, db8500_thermal_work);
low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");
if (low_irq < 0) {
dev_err(&pdev->dev, "Get IRQ_HOTMON_LOW failed.\n");
ret = low_irq;
goto out_unlock;
}
ret = devm_request_threaded_irq(&pdev->dev, low_irq, NULL,
prcmu_low_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
"dbx500_temp_low", pzone);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to allocate temp low irq.\n");
goto out_unlock;
}
high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
if (high_irq < 0) {
dev_err(&pdev->dev, "Get IRQ_HOTMON_HIGH failed.\n");
ret = high_irq;
goto out_unlock;
}
ret = devm_request_threaded_irq(&pdev->dev, high_irq, NULL,
prcmu_high_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
"dbx500_temp_high", pzone);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to allocate temp high irq.\n");
goto out_unlock;
}
pzone->therm_dev = thermal_zone_device_register("db8500_thermal_zone",
ptrips->num_trips, 0, pzone, &thdev_ops, NULL, 0, 0);
if (IS_ERR(pzone->therm_dev)) {
dev_err(&pdev->dev, "Register thermal zone device failed.\n");
ret = PTR_ERR(pzone->therm_dev);
goto out_unlock;
}
dev_info(&pdev->dev, "Thermal zone device registered.\n");
dft_low = PRCMU_DEFAULT_LOW_TEMP;
dft_high = ptrips->trip_points[0].temp;
db8500_thermal_update_config(pzone, 0, THERMAL_TREND_STABLE,
dft_low, dft_high);
platform_set_drvdata(pdev, pzone);
pzone->mode = THERMAL_DEVICE_ENABLED;
out_unlock:
mutex_unlock(&pzone->th_lock);
return ret;
}
static int db8500_thermal_remove(struct platform_device *pdev)
{
struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev);
thermal_zone_device_unregister(pzone->therm_dev);
cancel_work_sync(&pzone->therm_work);
mutex_destroy(&pzone->th_lock);
return 0;
}
static int db8500_thermal_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev);
flush_work(&pzone->therm_work);
prcmu_stop_temp_sense();
return 0;
}
static int db8500_thermal_resume(struct platform_device *pdev)
{
struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev);
struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
unsigned long dft_low, dft_high;
dft_low = PRCMU_DEFAULT_LOW_TEMP;
dft_high = ptrips->trip_points[0].temp;
db8500_thermal_update_config(pzone, 0, THERMAL_TREND_STABLE,
dft_low, dft_high);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id db8500_thermal_match[] = {
{ .compatible = "stericsson,db8500-thermal" },
{},
};
#endif
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,
.remove = db8500_thermal_remove,
};
module_platform_driver(db8500_thermal_driver);
MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
MODULE_DESCRIPTION("DB8500 thermal driver");
MODULE_LICENSE("GPL");