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.
185 lines
4.7 KiB
185 lines
4.7 KiB
7 years ago
|
/* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
|
||
|
*
|
||
|
* This program is free software; you can redistribute it and/or modify
|
||
|
* it under the terms of the GNU General Public License version 2 and
|
||
|
* only version 2 as published by the Free Software Foundation.
|
||
|
*
|
||
|
* 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/module.h>
|
||
|
#include <linux/platform_device.h>
|
||
|
#include <linux/thermal.h>
|
||
|
#include <linux/err.h>
|
||
|
#include <linux/slab.h>
|
||
|
#include <linux/regulator/consumer.h>
|
||
|
|
||
|
#define REG_CDEV_DRIVER "reg-cooling-device"
|
||
|
|
||
|
struct reg_cooling_device {
|
||
|
struct regulator *reg;
|
||
|
struct thermal_cooling_device *cool_dev;
|
||
|
unsigned int min_reg_state;
|
||
|
unsigned int *lvl;
|
||
|
unsigned int lvl_ct;
|
||
|
char reg_name[THERMAL_NAME_LENGTH];
|
||
|
bool reg_enable;
|
||
|
};
|
||
|
|
||
|
static int reg_get_max_state(struct thermal_cooling_device *cdev,
|
||
|
unsigned long *state)
|
||
|
{
|
||
|
struct reg_cooling_device *reg_dev = cdev->devdata;
|
||
|
|
||
|
*state = reg_dev->lvl_ct;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int reg_get_min_state(struct thermal_cooling_device *cdev,
|
||
|
unsigned long *state)
|
||
|
{
|
||
|
struct reg_cooling_device *reg_dev = cdev->devdata;
|
||
|
|
||
|
*state = reg_dev->min_reg_state;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int reg_set_min_state(struct thermal_cooling_device *cdev,
|
||
|
unsigned long state)
|
||
|
{
|
||
|
struct reg_cooling_device *reg_dev = cdev->devdata;
|
||
|
int ret = 0;
|
||
|
|
||
|
if (state > reg_dev->lvl_ct)
|
||
|
state = reg_dev->lvl_ct;
|
||
|
|
||
|
if (reg_dev->min_reg_state == state)
|
||
|
return ret;
|
||
|
|
||
|
ret = regulator_set_voltage(reg_dev->reg,
|
||
|
reg_dev->lvl[state], INT_MAX);
|
||
|
if (ret) {
|
||
|
dev_err(&cdev->device,
|
||
|
"switching to floor %lu err:%d\n",
|
||
|
state, ret);
|
||
|
return ret;
|
||
|
}
|
||
|
if (reg_dev->reg_enable && state == reg_dev->lvl_ct) {
|
||
|
ret = regulator_disable(reg_dev->reg);
|
||
|
if (ret) {
|
||
|
dev_err(&cdev->device,
|
||
|
"regulator disable err:%d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
reg_dev->reg_enable = false;
|
||
|
} else if (!reg_dev->reg_enable && state != reg_dev->lvl_ct) {
|
||
|
ret = regulator_enable(reg_dev->reg);
|
||
|
if (ret) {
|
||
|
dev_err(&cdev->device,
|
||
|
"regulator enable err:%d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
reg_dev->reg_enable = true;
|
||
|
}
|
||
|
reg_dev->min_reg_state = state;
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int reg_get_cur_state(struct thermal_cooling_device *cdev,
|
||
|
unsigned long *state)
|
||
|
{
|
||
|
*state = 0;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int reg_set_cur_state(struct thermal_cooling_device *cdev,
|
||
|
unsigned long state)
|
||
|
{
|
||
|
/* regulator cooling device doesn't support voltage ceil */
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct thermal_cooling_device_ops reg_device_ops = {
|
||
|
.get_max_state = reg_get_max_state,
|
||
|
.get_cur_state = reg_get_cur_state,
|
||
|
.set_cur_state = reg_set_cur_state,
|
||
|
.set_min_state = reg_set_min_state,
|
||
|
.get_min_state = reg_get_min_state,
|
||
|
};
|
||
|
|
||
|
static int reg_cdev_probe(struct platform_device *pdev)
|
||
|
{
|
||
|
struct reg_cooling_device *reg_dev;
|
||
|
int ret = 0;
|
||
|
struct device_node *np;
|
||
|
|
||
|
np = dev_of_node(&pdev->dev);
|
||
|
if (!np) {
|
||
|
dev_err(&pdev->dev,
|
||
|
"of node not available for cooling device\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
reg_dev = devm_kzalloc(&pdev->dev, sizeof(*reg_dev), GFP_KERNEL);
|
||
|
if (!reg_dev)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
reg_dev->reg = devm_regulator_get(&pdev->dev, "regulator-cdev");
|
||
|
if (IS_ERR_OR_NULL(reg_dev->reg)) {
|
||
|
ret = PTR_ERR(reg_dev->reg);
|
||
|
dev_err(&pdev->dev, "regulator register err:%d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
ret = of_property_count_u32_elems(np, "regulator-levels");
|
||
|
if (ret <= 0) {
|
||
|
dev_err(&pdev->dev, "Invalid levels err:%d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
reg_dev->lvl_ct = ret;
|
||
|
reg_dev->lvl = devm_kcalloc(&pdev->dev, reg_dev->lvl_ct,
|
||
|
sizeof(*reg_dev->lvl), GFP_KERNEL);
|
||
|
if (!reg_dev->lvl)
|
||
|
return -ENOMEM;
|
||
|
ret = of_property_read_u32_array(np, "regulator-levels",
|
||
|
reg_dev->lvl, reg_dev->lvl_ct);
|
||
|
if (ret) {
|
||
|
dev_err(&pdev->dev, "cdev level fetch err:%d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
/* level count is an index and it depicts the max possible index */
|
||
|
reg_dev->lvl_ct--;
|
||
|
reg_dev->min_reg_state = reg_dev->lvl_ct;
|
||
|
reg_dev->reg_enable = false;
|
||
|
strlcpy(reg_dev->reg_name, np->name, THERMAL_NAME_LENGTH);
|
||
|
|
||
|
reg_dev->cool_dev = thermal_of_cooling_device_register(
|
||
|
np, reg_dev->reg_name, reg_dev,
|
||
|
®_device_ops);
|
||
|
if (IS_ERR(reg_dev->cool_dev)) {
|
||
|
ret = PTR_ERR(reg_dev->cool_dev);
|
||
|
dev_err(&pdev->dev, "regulator cdev register err:%d\n",
|
||
|
ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static const struct of_device_id reg_cdev_of_match[] = {
|
||
|
{.compatible = "qcom,regulator-cooling-device", },
|
||
|
{}
|
||
|
};
|
||
|
|
||
|
static struct platform_driver reg_cdev_driver = {
|
||
|
.driver = {
|
||
|
.name = REG_CDEV_DRIVER,
|
||
|
.of_match_table = reg_cdev_of_match,
|
||
|
},
|
||
|
.probe = reg_cdev_probe,
|
||
|
};
|
||
|
builtin_platform_driver(reg_cdev_driver);
|