mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
5772717e59
The new Khadas VIM2 and VIM3 boards controls the cooling fan via the on-board microcontroller. This implements the FAN control as thermal devices and as cell of the Khadas MCU MFD driver. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
162 lines
3.6 KiB
C
162 lines
3.6 KiB
C
// 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>
|
|
|
|
#define MAX_LEVEL 3
|
|
|
|
struct khadas_mcu_fan_ctx {
|
|
struct khadas_mcu *mcu;
|
|
unsigned int level;
|
|
struct thermal_cooling_device *cdev;
|
|
};
|
|
|
|
static int khadas_mcu_fan_set_level(struct khadas_mcu_fan_ctx *ctx,
|
|
unsigned int level)
|
|
{
|
|
int ret;
|
|
|
|
ret = regmap_write(ctx->mcu->regmap, KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG,
|
|
level);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ctx->level = level;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int khadas_mcu_fan_get_max_state(struct thermal_cooling_device *cdev,
|
|
unsigned long *state)
|
|
{
|
|
*state = MAX_LEVEL;
|
|
|
|
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;
|
|
|
|
if (state > MAX_LEVEL)
|
|
return -EINVAL;
|
|
|
|
if (state == ctx->level)
|
|
return 0;
|
|
|
|
return khadas_mcu_fan_set_level(ctx, state);
|
|
}
|
|
|
|
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 int khadas_mcu_fan_probe(struct platform_device *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;
|
|
|
|
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
ctx->mcu = mcu;
|
|
platform_set_drvdata(pdev, ctx);
|
|
|
|
cdev = devm_thermal_of_cooling_device_register(dev->parent,
|
|
dev->parent->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;
|
|
thermal_cdev_update(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, 0);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int khadas_mcu_fan_suspend(struct device *dev)
|
|
{
|
|
struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
|
|
unsigned int level_save = ctx->level;
|
|
int ret;
|
|
|
|
ret = khadas_mcu_fan_set_level(ctx, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ctx->level = level_save;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int khadas_mcu_fan_resume(struct device *dev)
|
|
{
|
|
struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
|
|
|
|
return khadas_mcu_fan_set_level(ctx, 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", },
|
|
{},
|
|
};
|
|
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");
|