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argonone-fan.c
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argonone-fan.c
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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/thermal.h>
#include <linux/hwmon.h>
#include <linux/pm.h>
#define ARGONONE_FAN_DEVICE_NAME "argonone-fan"
static struct i2c_device_id const argonone_fan_id_table[] = {
{ ARGONONE_FAN_DEVICE_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, argonone_fan_id_table);
static unsigned short const argonone_fan_address = 0x1a;
static unsigned short const argonone_fan_address_list[] = {
argonone_fan_address, I2C_CLIENT_END
};
static int argonone_fan_probe(struct i2c_client *client);
static int argonone_fan_remove(struct i2c_client *client);
static void argonone_fan_shutdown(struct i2c_client *client);
static int argonone_fan_suspend(struct device *device);
static int argonone_fan_resume(struct device *device);
static ssize_t argonone_fan_attr_min_show(struct device *device, struct device_attribute *attribute, char *buffer);
static struct device_attribute argonone_fan_attr_min = {
.attr = { .name = "fan1_min", .mode = 0444, },
.show = argonone_fan_attr_min_show,
};
static ssize_t argonone_fan_attr_max_show(struct device *device, struct device_attribute *attribute, char *buffer);
static struct device_attribute argonone_fan_attr_max = {
.attr = { .name = "fan1_max", .mode = 0444, },
.show = argonone_fan_attr_max_show,
};
static ssize_t argonone_fan_attr_input_show(struct device *device, struct device_attribute *attribute, char *buffer);
static struct device_attribute argonone_fan_attr_input = {
.attr = { .name = "fan1_input", .mode = 0444, },
.show = argonone_fan_attr_input_show,
};
static ssize_t argonone_fan_attr_target_store(struct device *device, struct device_attribute *attribute, const char *buffer, size_t count);
static struct device_attribute argonone_fan_attr_target = {
.attr = { .name = "fan1_target", .mode = 0644, },
.show = argonone_fan_attr_input_show,
.store = argonone_fan_attr_target_store,
};
static struct attribute *argonone_fan_hwmon_attr[] = {
&argonone_fan_attr_input.attr,
&argonone_fan_attr_target.attr,
&argonone_fan_attr_min.attr,
&argonone_fan_attr_max.attr,
NULL,
};
static const struct attribute_group argonone_fan_hwmon_group = {
.attrs = argonone_fan_hwmon_attr,
};
static const struct attribute_group *argonone_fan_hwmon_groups[] = {
&argonone_fan_hwmon_group,
NULL
};
static int argonone_fan_get_max_state(struct thermal_cooling_device *device, unsigned long *target);
static int argonone_fan_get_cur_state(struct thermal_cooling_device *device, unsigned long *target);
static int argonone_fan_set_cur_state(struct thermal_cooling_device *device, unsigned long target);
static struct thermal_cooling_device_ops const argonone_fan_cl_dev_ops = {
.get_max_state = argonone_fan_get_max_state,
.get_cur_state = argonone_fan_get_cur_state,
.set_cur_state = argonone_fan_set_cur_state,
};
static struct dev_pm_ops argonone_fan_pm_ops = {
.suspend = argonone_fan_suspend,
.resume = argonone_fan_resume,
};
static struct i2c_driver argonone_fan_driver = {
.driver = {
.name = ARGONONE_FAN_DEVICE_NAME,
.pm = &argonone_fan_pm_ops,
},
.id_table = argonone_fan_id_table,
.probe_new = argonone_fan_probe,
.remove = argonone_fan_remove,
.class = I2C_CLASS_HWMON,
.address_list = argonone_fan_address_list,
.shutdown = argonone_fan_shutdown,
};
module_i2c_driver(argonone_fan_driver);
struct argonone_fan_data {
struct thermal_cooling_device *cl_dev;
struct device *hwmon_dev;
unsigned short throttle;
};
static int argonone_fan_probe(struct i2c_client *client)
{
int err;
struct argonone_fan_data *data;
struct device *dev;
struct device_node *np;
dev = &client->dev;
np = dev->of_node;
data = devm_kmalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
err = i2c_smbus_write_byte(client, 0);
if (err)
return err;
data->throttle = 0;
/* The data is set before registering any of these device since once a device is registered, then coresponding callbacks will be called and they would find out data is NULL. */
i2c_set_clientdata(client, data);
data->hwmon_dev = devm_hwmon_device_register_with_groups(dev, ARGONONE_FAN_DEVICE_NAME, client, argonone_fan_hwmon_groups);
if (IS_ERR(data->hwmon_dev))
return PTR_ERR(data->hwmon_dev);
data->cl_dev = devm_thermal_of_cooling_device_register(dev, np, "argonone-fan", client, &argonone_fan_cl_dev_ops);
if (IS_ERR(data->cl_dev))
return PTR_ERR(data->cl_dev);
return 0;
}
static int argonone_fan_remove(struct i2c_client *client)
{
return i2c_smbus_write_byte(client, 0);
}
static void argonone_fan_shutdown(struct i2c_client *client)
{
i2c_smbus_write_byte(client, 0);
}
static int argonone_fan_suspend(struct device *device)
{
int err;
struct i2c_client *client;
client = to_i2c_client(device);
err = i2c_smbus_write_byte(client, 0);
if (err)
return err;
return 0;
}
static int argonone_fan_resume(struct device *device)
{
int err;
struct i2c_client *client;
struct argonone_fan_data *data;
client = to_i2c_client(device);
data = dev_get_drvdata(device);
err = i2c_smbus_write_byte(client, data->throttle);
if (err)
return err;
return 0;
}
#if 0
static int argonone_fan_detect(struct i2c_client *client, struct i2c_board_info *info)
{
int ret;
int address = info->addr;
struct i2c_adapter *adapter = client->adapter;
printk(KERN_INFO "Detecting Argon ONE fan...\n");
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA | I2C_FUNC_SMBUS_QUICK))
return -ENODEV;
if (address != 0x1a)
return -ENODEV;
ret = i2c_smbus_xfer(client->adapter, client->addr, 0, I2C_SMBUS_WRITE, 0, I2C_SMBUS_QUICK, NULL);
if (ret < 0)
return -ENODEV;
printk(KERN_INFO "Detected Argon ONE fan.\n");
return 0;
}
#endif
static ssize_t argonone_fan_attr_min_show(struct device *device, struct device_attribute *attribute, char *buffer)
{
return sprintf(buffer, "0\n");
}
static ssize_t argonone_fan_attr_max_show(struct device *device, struct device_attribute *attribute, char *buffer)
{
return sprintf(buffer, "100\n");
}
static ssize_t argonone_fan_attr_input_show(struct device *device, struct device_attribute *attribute, char *buffer)
{
struct i2c_client *client;
struct argonone_fan_data *data;
client = dev_get_drvdata(device);
data = i2c_get_clientdata(client);
return sprintf(buffer, "%u\n", data->throttle);
}
static ssize_t argonone_fan_attr_target_store(struct device *device, struct device_attribute *attribute, const char *buffer, size_t count)
{
struct i2c_client *client;
struct argonone_fan_data *data;
u8 target;
int err;
if (kstrtou8(buffer, 10, &target) || target > 100)
return -EINVAL;
client = dev_get_drvdata(device);
err = i2c_smbus_write_byte(client, target);
if (err)
return err;
data = i2c_get_clientdata(client);
data->throttle = target;
return 0;
}
static int argonone_fan_get_max_state(struct thermal_cooling_device *device, unsigned long *target)
{
*target = 100;
return 0;
}
static int argonone_fan_get_cur_state(struct thermal_cooling_device *device, unsigned long *target) {
struct i2c_client *client;
struct argonone_fan_data *data;
client = device->devdata;
data = i2c_get_clientdata(client);
*target = data->throttle;
return 0;
}
static int argonone_fan_set_cur_state(struct thermal_cooling_device *device, unsigned long target)
{
int err;
struct i2c_client *client;
struct argonone_fan_data *data;
if (target > 100)
return -EINVAL;
client = device->devdata;
err = i2c_smbus_write_byte(client, target);
if (err)
return err;
data = i2c_get_clientdata(client);
data->throttle = target;
return 0;
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Tony Fettes <tonyfettes@tonyfettes.com>");
MODULE_DESCRIPTION("Driver for fan on Argon ONE case for Raspberry Pi");