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/*
* palmas_thermal.c -- TI PALMAS THERMAL.
*
* Copyright (c) 2013-2014, NVIDIA Corporation. All rights reserved.
*
* Author: Pradeep Goudagunta <pgoudagunta@nvidia.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 version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
* whether express or implied; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307, USA
*/
#include <linux/module.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/thermal.h>
#include <linux/platform_data/thermal_sensors.h>
#include <linux/of.h>
#include <linux/mfd/palmas.h>
#define PALMAS_NORMAL_OPERATING_TEMP 100000
#define PALMAS_CRITICAL_DEFUALT_TEMP 108000
struct palmas_therm_zone {
struct device *dev;
struct palmas *palmas;
struct thermal_zone_device *tz_device;
int irq;
long hd_threshold_temp;
const char *tz_name;
};
static struct thermal_trip_info palmas_tpoint = {
.cdev_type = "emergency-balanced",
.trip_temp = PALMAS_CRITICAL_DEFUALT_TEMP,
.trip_type = THERMAL_TRIP_ACTIVE,
.upper = THERMAL_NO_LIMIT,
.lower = THERMAL_NO_LIMIT,
};
static int palmas_thermal_get_temp(struct thermal_zone_device *tz_device,
long *temp)
{
int ret;
unsigned int val;
struct palmas_therm_zone *ptherm_zone = tz_device->devdata;
ret = palmas_read(ptherm_zone->palmas, PALMAS_INTERRUPT_BASE,
PALMAS_INT1_LINE_STATE, &val);
if (ret < 0) {
dev_err(ptherm_zone->dev,
"%s: Failed to read INT1_LINE_STATE, %d\n",
__func__, ret);
return -EINVAL;
}
if (val & PALMAS_INT1_STATUS_HOTDIE)
*temp = palmas_tpoint.trip_temp + 1; /* + 1 to trigger cdev */
else
*temp = PALMAS_NORMAL_OPERATING_TEMP;
return 0;
}
static int palmas_thermal_get_trip_type(struct thermal_zone_device *tz_device,
int trip, enum thermal_trip_type *type)
{
if (trip >= 1)
return -EINVAL;
*type = palmas_tpoint.trip_type;
return 0;
}
static int palmas_thermal_get_trip_temp(struct thermal_zone_device *tz_device,
int trip, long *temp)
{
if (trip >= 1)
return -EINVAL;
*temp = palmas_tpoint.trip_temp;
return 0;
}
static int palmas_thermal_bind(struct thermal_zone_device *thz,
struct thermal_cooling_device *cdev)
{
if (!strncmp(palmas_tpoint.cdev_type, cdev->type, THERMAL_NAME_LENGTH))
thermal_zone_bind_cooling_device(
thz, 0, cdev, palmas_tpoint.upper, palmas_tpoint.lower);
return 0;
}
static int palmas_thermal_unbind(struct thermal_zone_device *thz,
struct thermal_cooling_device *cdev)
{
if (!strncmp(palmas_tpoint.cdev_type, cdev->type, THERMAL_NAME_LENGTH))
thermal_zone_unbind_cooling_device(thz, 0, cdev);
return 0;
}
static struct thermal_zone_device_ops palmas_tz_ops = {
.get_temp = palmas_thermal_get_temp,
.get_trip_type = palmas_thermal_get_trip_type,
.get_trip_temp = palmas_thermal_get_trip_temp,
.bind = palmas_thermal_bind,
.unbind = palmas_thermal_unbind,
};
static irqreturn_t palmas_thermal_irq(int irq, void *data)
{
struct palmas_therm_zone *ptherm_zone = data;
thermal_zone_device_update(ptherm_zone->tz_device);
return IRQ_HANDLED;
}
static int palmas_thermal_probe(struct platform_device *pdev)
{
struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
struct palmas_platform_data *pdata;
struct palmas_therm_zone *ptherm_zone;
struct device_node *np = pdev->dev.of_node;
const char *tz_name = NULL;
u32 hd_threshold_temp = 0;
u32 pval;
int ret;
u8 val;
pdata = dev_get_platdata(pdev->dev.parent);
if (pdata) {
tz_name = pdata->tz_name;
hd_threshold_temp = pdata->hd_threshold_temp;
} else {
if (np) {
tz_name = of_get_property(np, "ti,tz-name", NULL);
ret = of_property_read_u32(np,
"ti,hot-die-threshold-temp", &pval);
if (!ret)
hd_threshold_temp = pval;
}
}
if (!hd_threshold_temp) {
dev_err(&pdev->dev, "Hot die temp is not provided\n");
return -EINVAL;
}
if (!tz_name)
tz_name = "palmas-die-thermal";
ptherm_zone = devm_kzalloc(&pdev->dev, sizeof(*ptherm_zone),
GFP_KERNEL);
if (!ptherm_zone) {
dev_err(&pdev->dev, "No available free memory\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, ptherm_zone);
ptherm_zone->dev = &pdev->dev;
ptherm_zone->palmas = palmas;
ptherm_zone->hd_threshold_temp = (long)hd_threshold_temp;
ptherm_zone->tz_name = tz_name;
ptherm_zone->tz_device = thermal_zone_device_register(tz_name,
1, 0, ptherm_zone, &palmas_tz_ops,
NULL, 0, 0);
if (IS_ERR_OR_NULL(ptherm_zone->tz_device)) {
dev_err(ptherm_zone->dev,
"Register thermal zone device failed.\n");
return PTR_ERR(ptherm_zone->tz_device);
}
palmas_tpoint.trip_temp = ptherm_zone->hd_threshold_temp;
ptherm_zone->irq = platform_get_irq(pdev, 0);
ret = request_threaded_irq(ptherm_zone->irq, NULL,
palmas_thermal_irq,
IRQF_ONESHOT, dev_name(&pdev->dev),
ptherm_zone);
if (ret < 0) {
dev_err(&pdev->dev,
"request irq %d failed: %dn", ptherm_zone->irq, ret);
goto int_req_failed;
}
if (palmas_tpoint.trip_temp <= 108000UL)
val = 0;
else if (palmas_tpoint.trip_temp <= 112000UL)
val = 1;
else if (palmas_tpoint.trip_temp <= 116000UL)
val = 2;
else if (palmas_tpoint.trip_temp <= 120000UL)
val = 3;
else
val = 3;
val <<= PALMAS_OSC_THERM_CTRL_THERM_HD_SEL_SHIFT;
ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE,
PALMAS_OSC_THERM_CTRL,
PALMAS_OSC_THERM_CTRL_THERM_HD_SEL_MASK, val);
if (ret < 0) {
dev_err(&pdev->dev, "osc_therm_ctrl reg update failed.\n");
goto error;
}
return 0;
error:
free_irq(ptherm_zone->irq, ptherm_zone);
int_req_failed:
thermal_zone_device_unregister(ptherm_zone->tz_device);
return ret;
}
static int palmas_thermal_remove(struct platform_device *pdev)
{
struct palmas_therm_zone *ptherm_zone = platform_get_drvdata(pdev);
free_irq(ptherm_zone->irq, ptherm_zone);
thermal_zone_device_unregister(ptherm_zone->tz_device);
return 0;
}
static const struct of_device_id palmas_thermal_match[] = {
{ .compatible = "ti,palmas-thermal", },
{ },
};
MODULE_DEVICE_TABLE(of, palmas_thermal_match);
static struct platform_driver palmas_thermal_driver = {
.probe = palmas_thermal_probe,
.remove = palmas_thermal_remove,
.driver = {
.name = "palmas-thermal",
.owner = THIS_MODULE,
.of_match_table = palmas_thermal_match,
},
};
module_platform_driver(palmas_thermal_driver);
MODULE_DESCRIPTION("Palmas Thermal driver");
MODULE_AUTHOR("Pradeep Goudagunta<pgoudagunta@nvidia.com>");
MODULE_ALIAS("platform:palmas-thermal");
MODULE_LICENSE("GPL v2");
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