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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2023 Hewlett-Packard Enterprise Development Company, L.P. */
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
struct gxp_fan_ctrl_drvdata {
void __iomem *base;
};
static int gxp_pwm_write(struct device *dev, u32 attr, int channel, long val)
{
struct gxp_fan_ctrl_drvdata *drvdata = dev_get_drvdata(dev);
switch (attr) {
case hwmon_pwm_input:
if (val > 255 || val < 0)
return -EINVAL;
writeb(val, drvdata->base + channel);
return 0;
default:
return -EOPNOTSUPP;
}
}
static int gxp_fan_ctrl_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
switch (type) {
case hwmon_pwm:
return gxp_pwm_write(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static int gxp_pwm_read(struct device *dev, u32 attr, int channel, long *val)
{
struct gxp_fan_ctrl_drvdata *drvdata = dev_get_drvdata(dev);
*val = readb(drvdata->base + channel);
return 0;
}
static int gxp_fan_ctrl_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
switch (type) {
case hwmon_pwm:
return gxp_pwm_read(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static umode_t gxp_fan_ctrl_is_visible(const void *_data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
umode_t mode = 0;
switch (type) {
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_input:
mode = 0644;
break;
default:
break;
}
break;
default:
break;
}
return mode;
}
static const struct hwmon_ops gxp_fan_ctrl_ops = {
.is_visible = gxp_fan_ctrl_is_visible,
.read = gxp_fan_ctrl_read,
.write = gxp_fan_ctrl_write,
};
static const struct hwmon_channel_info * const gxp_fan_ctrl_info[] = {
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT),
NULL
};
static const struct hwmon_chip_info gxp_fan_ctrl_chip_info = {
.ops = &gxp_fan_ctrl_ops,
.info = gxp_fan_ctrl_info,
};
static int gxp_fan_ctrl_probe(struct platform_device *pdev)
{
struct gxp_fan_ctrl_drvdata *drvdata;
struct device *dev = &pdev->dev;
struct device *hwmon_dev;
drvdata = devm_kzalloc(dev, sizeof(struct gxp_fan_ctrl_drvdata),
GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
if (IS_ERR(drvdata->base))
return dev_err_probe(dev, PTR_ERR(drvdata->base),
"failed to map base\n");
hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
"hpe_gxp_fan_ctrl",
drvdata,
&gxp_fan_ctrl_chip_info,
NULL);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct of_device_id gxp_fan_ctrl_of_match[] = {
{ .compatible = "hpe,gxp-fan-ctrl", },
{},
};
MODULE_DEVICE_TABLE(of, gxp_fan_ctrl_of_match);
static struct platform_driver gxp_fan_ctrl_driver = {
.probe = gxp_fan_ctrl_probe,
.driver = {
.name = "gxp-fan-ctrl",
.of_match_table = gxp_fan_ctrl_of_match,
},
};
module_platform_driver(gxp_fan_ctrl_driver);
MODULE_AUTHOR("Nick Hawkins <nick.hawkins@hpe.com>");
MODULE_DESCRIPTION("HPE GXP fan controller");
MODULE_LICENSE("GPL");
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