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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Khadas MCU Controlled FAN driver
*
* Copyright (C) 2020 BayLibre SAS
* Author(s): Neil Armstrong <narmstrong@baylibre.com>
*/
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/mfd/khadas-mcu.h>
#include <linux/regmap.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>
#include <linux/regulator/consumer.h>
#include <linux/minmax.h>
#define MAX_LEVEL 5
struct khadas_mcu_fan_ctx {
struct khadas_mcu *mcu;
unsigned int fan_reg;
unsigned int level;
const unsigned int *levels;
unsigned int nlevels;
struct thermal_cooling_device *cdev;
struct regulator *power;
};
static int khadas_mcu_fan_set_level(struct khadas_mcu_fan_ctx *ctx,
unsigned int level)
{
return regmap_write(ctx->mcu->regmap, ctx->fan_reg, level);
}
static int khadas_mcu_fan_get_max_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
struct khadas_mcu_fan_ctx *ctx = cdev->devdata;
*state = min_t(unsigned int, MAX_LEVEL, ctx->nlevels - 1);
return 0;
}
static int khadas_mcu_fan_get_cur_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
struct khadas_mcu_fan_ctx *ctx = cdev->devdata;
*state = ctx->level;
return 0;
}
static int
khadas_mcu_fan_set_cur_state(struct thermal_cooling_device *cdev,
unsigned long state)
{
struct khadas_mcu_fan_ctx *ctx = cdev->devdata;
int ret;
if (state > MAX_LEVEL || state >= ctx->nlevels)
return -EINVAL;
if (state == ctx->level)
return 0;
ret = khadas_mcu_fan_set_level(ctx, ctx->levels[state]);
if (ret)
return ret;
ctx->level = state;
return 0;
}
static const struct thermal_cooling_device_ops khadas_mcu_fan_cooling_ops = {
.get_max_state = khadas_mcu_fan_get_max_state,
.get_cur_state = khadas_mcu_fan_get_cur_state,
.set_cur_state = khadas_mcu_fan_set_cur_state,
};
static void khadas_mcu_fan_regulator_disable(void *data)
{
struct regulator *power = data;
regulator_disable(power);
}
static const unsigned int khadas_mcu_fan_levels[] = { 0, 1, 2, 3 };
static const unsigned int khadas_mcu_vim4_fan_levels[] = { 0, 30, 40, 55, 75, 100 };
static int khadas_mcu_fan_probe(struct platform_device *pdev)
{
const struct platform_device_id *id = platform_get_device_id(pdev);
struct khadas_mcu *mcu = dev_get_drvdata(pdev->dev.parent);
struct thermal_cooling_device *cdev;
struct device *dev = &pdev->dev;
struct khadas_mcu_fan_ctx *ctx;
int ret;
if (!dev->of_node)
dev->of_node = of_node_get(dev->parent->of_node);
if (!id)
return -EINVAL;
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->mcu = mcu;
switch (id->driver_data) {
case KHADAS_MCU_GENERIC:
ctx->fan_reg = KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG;
ctx->levels = khadas_mcu_fan_levels;
ctx->nlevels = ARRAY_SIZE(khadas_mcu_fan_levels);
break;
case KHADAS_MCU_VIM4:
ctx->fan_reg = KHADAS_MCU_VIM4_FAN_CTRL_REG;
ctx->levels = khadas_mcu_vim4_fan_levels;
ctx->nlevels = ARRAY_SIZE(khadas_mcu_vim4_fan_levels);
break;
default:
return -ENODEV;
}
ctx->power = devm_regulator_get(dev, "fan");
if (IS_ERR(ctx->power))
return PTR_ERR(ctx->power);
ret = regulator_enable(ctx->power);
if (ret) {
dev_err(dev, "Failed to enable fan power supply: %d\n", ret);
return ret;
}
ret = devm_add_action_or_reset(dev, khadas_mcu_fan_regulator_disable, ctx->power);
if (ret)
return ret;
platform_set_drvdata(pdev, ctx);
cdev = devm_thermal_of_child_cooling_device_register(dev,
dev->of_node,
"khadas-mcu-fan", ctx,
&khadas_mcu_fan_cooling_ops);
if (IS_ERR(cdev)) {
ret = PTR_ERR(cdev);
dev_err(dev, "Failed to register khadas-mcu-fan as cooling device: %d\n",
ret);
return ret;
}
ctx->cdev = cdev;
return 0;
}
static void khadas_mcu_fan_shutdown(struct platform_device *pdev)
{
struct khadas_mcu_fan_ctx *ctx = platform_get_drvdata(pdev);
khadas_mcu_fan_set_level(ctx, ctx->levels[0]);
}
#ifdef CONFIG_PM_SLEEP
static int khadas_mcu_fan_suspend(struct device *dev)
{
struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
int ret;
ret = khadas_mcu_fan_set_level(ctx, ctx->levels[0]);
if (ret)
return ret;
ret = regulator_disable(ctx->power);
if (ret) {
khadas_mcu_fan_set_level(ctx, ctx->levels[ctx->level]);
return ret;
}
return 0;
}
static int khadas_mcu_fan_resume(struct device *dev)
{
struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
int ret;
ret = regulator_enable(ctx->power);
if (ret)
return ret;
return khadas_mcu_fan_set_level(ctx, ctx->levels[ctx->level]);
}
#endif
static SIMPLE_DEV_PM_OPS(khadas_mcu_fan_pm, khadas_mcu_fan_suspend,
khadas_mcu_fan_resume);
static const struct platform_device_id khadas_mcu_fan_id_table[] = {
{ .name = "khadas-mcu-fan-ctrl", .driver_data = KHADAS_MCU_GENERIC },
{ .name = "khadas-mcu-vim4-fan", .driver_data = KHADAS_MCU_VIM4 },
{},
};
MODULE_DEVICE_TABLE(platform, khadas_mcu_fan_id_table);
static struct platform_driver khadas_mcu_fan_driver = {
.probe = khadas_mcu_fan_probe,
.shutdown = khadas_mcu_fan_shutdown,
.driver = {
.name = "khadas-mcu-fan-ctrl",
.pm = &khadas_mcu_fan_pm,
},
.id_table = khadas_mcu_fan_id_table,
};
module_platform_driver(khadas_mcu_fan_driver);
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
MODULE_DESCRIPTION("Khadas MCU FAN driver");
MODULE_LICENSE("GPL");
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