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LingmoOS-kernel/drivers/hwmon/max6639.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* max6639.c - Support for Maxim MAX6639
*
* 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
*
* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
*
* based on the initial MAX6639 support from semptian.net
* by He Changqing <hechangqing@semptian.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/platform_data/max6639.h>
#include <linux/regmap.h>
/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
/* The MAX6639 registers, valid channel numbers: 0, 1 */
#define MAX6639_REG_TEMP(ch) (0x00 + (ch))
#define MAX6639_REG_STATUS 0x02
#define MAX6639_REG_OUTPUT_MASK 0x03
#define MAX6639_REG_GCONFIG 0x04
#define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch))
#define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch))
#define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch))
#define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch))
#define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4)
#define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4)
#define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4)
#define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4)
#define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch))
#define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch))
#define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch))
#define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch))
#define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch))
#define MAX6639_REG_DEVID 0x3D
#define MAX6639_REG_MANUID 0x3E
#define MAX6639_REG_DEVREV 0x3F
/* Register bits */
#define MAX6639_GCONFIG_STANDBY 0x80
#define MAX6639_GCONFIG_POR 0x40
#define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20
#define MAX6639_GCONFIG_CH2_LOCAL 0x10
#define MAX6639_GCONFIG_PWM_FREQ_HI 0x08
#define MAX6639_FAN_CONFIG1_PWM 0x80
#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40
#define MAX6639_NUM_CHANNELS 2
static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
#define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \
0 : (rpm_ranges[rpm_range] * 30) / (val))
#define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255)
/*
* Client data (each client gets its own)
*/
struct max6639_data {
struct regmap *regmap;
/* Register values initialized only once */
u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */
u8 rpm_range; /* Index in above rpm_ranges table */
/* Optional regulator for FAN supply */
struct regulator *reg;
};
static ssize_t temp_input_show(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
long temp;
struct max6639_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
unsigned int val;
int res;
/*
* Lock isn't needed as MAX6639_REG_TEMP wpnt change for at least 250ms after reading
* MAX6639_REG_TEMP_EXT
*/
res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(attr->index), &val);
if (res < 0)
return res;
temp = val >> 5;
res = regmap_read(data->regmap, MAX6639_REG_TEMP(attr->index), &val);
if (res < 0)
return res;
temp |= val << 3;
temp *= 125;
return sprintf(buf, "%ld\n", temp);
}
static ssize_t temp_fault_show(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
struct max6639_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
unsigned int val;
int res;
res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(attr->index), &val);
if (res < 0)
return res;
return sprintf(buf, "%d\n", val & 1);
}
static ssize_t temp_max_show(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned int val;
int res;
res = regmap_read(data->regmap, MAX6639_REG_THERM_LIMIT(attr->index), &val);
if (res < 0)
return res;
return sprintf(buf, "%d\n", (val * 1000));
}
static ssize_t temp_max_store(struct device *dev,
struct device_attribute *dev_attr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned long val;
int res;
res = kstrtoul(buf, 10, &val);
if (res)
return res;
regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(attr->index),
TEMP_LIMIT_TO_REG(val));
return count;
}
static ssize_t temp_crit_show(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned int val;
int res;
res = regmap_read(data->regmap, MAX6639_REG_ALERT_LIMIT(attr->index), &val);
if (res < 0)
return res;
return sprintf(buf, "%d\n", (val * 1000));
}
static ssize_t temp_crit_store(struct device *dev,
struct device_attribute *dev_attr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned long val;
int res;
res = kstrtoul(buf, 10, &val);
if (res)
return res;
regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(attr->index),
TEMP_LIMIT_TO_REG(val));
return count;
}
static ssize_t temp_emergency_show(struct device *dev,
struct device_attribute *dev_attr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned int val;
int res;
res = regmap_read(data->regmap, MAX6639_REG_OT_LIMIT(attr->index), &val);
if (res < 0)
return res;
return sprintf(buf, "%d\n", (val * 1000));
}
static ssize_t temp_emergency_store(struct device *dev,
struct device_attribute *dev_attr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned long val;
int res;
res = kstrtoul(buf, 10, &val);
if (res)
return res;
regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(attr->index), TEMP_LIMIT_TO_REG(val));
return count;
}
static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned int val;
int res;
res = regmap_read(data->regmap, MAX6639_REG_TARGTDUTY(attr->index), &val);
if (res < 0)
return res;
return sprintf(buf, "%d\n", val * 255 / 120);
}
static ssize_t pwm_store(struct device *dev,
struct device_attribute *dev_attr, const char *buf,
size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
unsigned long val;
int res;
res = kstrtoul(buf, 10, &val);
if (res)
return res;
val = clamp_val(val, 0, 255);
regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(attr->index), val * 120 / 255);
return count;
}
static ssize_t fan_input_show(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
struct max6639_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
unsigned int val;
int res;
res = regmap_read(data->regmap, MAX6639_REG_FAN_CNT(attr->index), &val);
if (res < 0)
return res;
return sprintf(buf, "%d\n", FAN_FROM_REG(val, data->rpm_range));
}
static ssize_t alarm_show(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
struct max6639_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
unsigned int val;
int res;
res = regmap_read(data->regmap, MAX6639_REG_STATUS, &val);
if (res < 0)
return res;
return sprintf(buf, "%d\n", !!(val & (1 << attr->index)));
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0);
static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1);
static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0);
static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1);
static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1);
static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3);
static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7);
static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6);
static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5);
static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4);
static struct attribute *max6639_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp1_fault.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
&sensor_dev_attr_temp1_emergency.dev_attr.attr,
&sensor_dev_attr_temp2_emergency.dev_attr.attr,
&sensor_dev_attr_pwm1.dev_attr.attr,
&sensor_dev_attr_pwm2.dev_attr.attr,
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan2_input.dev_attr.attr,
&sensor_dev_attr_fan1_fault.dev_attr.attr,
&sensor_dev_attr_fan2_fault.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(max6639);
/*
* returns respective index in rpm_ranges table
* 1 by default on invalid range
*/
static int rpm_range_to_reg(int range)
{
int i;
for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
if (rpm_ranges[i] == range)
return i;
}
return 1; /* default: 4000 RPM */
}
static int max6639_set_ppr(struct max6639_data *data, u8 channel, u8 ppr)
{
return regmap_write(data->regmap, MAX6639_REG_FAN_PPR(channel), ppr << 6);
}
static int max6639_init_client(struct i2c_client *client,
struct max6639_data *data)
{
struct max6639_platform_data *max6639_info =
dev_get_platdata(&client->dev);
int i;
int rpm_range = 1; /* default: 4000 RPM */
int err, ppr;
/* Reset chip to default values, see below for GCONFIG setup */
err = regmap_write(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_POR);
if (err)
return err;
/* Fans pulse per revolution is 2 by default */
if (max6639_info && max6639_info->ppr > 0 &&
max6639_info->ppr < 5)
ppr = max6639_info->ppr;
else
ppr = 2;
ppr -= 1;
if (max6639_info)
rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
data->rpm_range = rpm_range;
for (i = 0; i < MAX6639_NUM_CHANNELS; i++) {
/* Set Fan pulse per revolution */
err = max6639_set_ppr(data, i, ppr);
if (err)
return err;
/* Fans config PWM, RPM */
err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG1(i),
MAX6639_FAN_CONFIG1_PWM | rpm_range);
if (err)
return err;
/* Fans PWM polarity high by default */
if (max6639_info && max6639_info->pwm_polarity == 0)
err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x00);
else
err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x02);
if (err)
return err;
/*
* /THERM full speed enable,
* PWM frequency 25kHz, see also GCONFIG below
*/
err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG3(i),
MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03);
if (err)
return err;
/* Max. temp. 80C/90C/100C */
err = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(i), 80);
if (err)
return err;
err = regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(i), 90);
if (err)
return err;
err = regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(i), 100);
if (err)
return err;
/* PWM 120/120 (i.e. 100%) */
err = regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(i), 120);
if (err)
return err;
}
/* Start monitoring */
return regmap_write(data->regmap, MAX6639_REG_GCONFIG,
MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL |
MAX6639_GCONFIG_PWM_FREQ_HI);
}
/* Return 0 if detection is successful, -ENODEV otherwise */
static int max6639_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
int dev_id, manu_id;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/* Actual detection via device and manufacturer ID */
dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
if (dev_id != 0x58 || manu_id != 0x4D)
return -ENODEV;
strscpy(info->type, "max6639", I2C_NAME_SIZE);
return 0;
}
static void max6639_regulator_disable(void *data)
{
regulator_disable(data);
}
static bool max6639_regmap_is_volatile(struct device *dev, unsigned int reg)
{
switch (reg) {
case MAX6639_REG_TEMP(0):
case MAX6639_REG_TEMP_EXT(0):
case MAX6639_REG_TEMP(1):
case MAX6639_REG_TEMP_EXT(1):
case MAX6639_REG_STATUS:
case MAX6639_REG_FAN_CNT(0):
case MAX6639_REG_FAN_CNT(1):
case MAX6639_REG_TARGTDUTY(0):
case MAX6639_REG_TARGTDUTY(1):
return true;
default:
return false;
}
}
static const struct regmap_config max6639_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX6639_REG_DEVREV,
.cache_type = REGCACHE_MAPLE,
.volatile_reg = max6639_regmap_is_volatile,
};
static int max6639_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct max6639_data *data;
struct device *hwmon_dev;
int err;
data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->regmap = devm_regmap_init_i2c(client, &max6639_regmap_config);
if (IS_ERR(data->regmap))
return dev_err_probe(dev,
PTR_ERR(data->regmap),
"regmap initialization failed\n");
data->reg = devm_regulator_get_optional(dev, "fan");
if (IS_ERR(data->reg)) {
if (PTR_ERR(data->reg) != -ENODEV)
return PTR_ERR(data->reg);
data->reg = NULL;
} else {
/* Spin up fans */
err = regulator_enable(data->reg);
if (err) {
dev_err(dev, "Failed to enable fan supply: %d\n", err);
return err;
}
err = devm_add_action_or_reset(dev, max6639_regulator_disable,
data->reg);
if (err) {
dev_err(dev, "Failed to register action: %d\n", err);
return err;
}
}
/* Initialize the max6639 chip */
err = max6639_init_client(client, data);
if (err < 0)
return err;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data,
max6639_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static int max6639_suspend(struct device *dev)
{
struct max6639_data *data = dev_get_drvdata(dev);
if (data->reg)
regulator_disable(data->reg);
return regmap_write_bits(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_STANDBY,
MAX6639_GCONFIG_STANDBY);
}
static int max6639_resume(struct device *dev)
{
struct max6639_data *data = dev_get_drvdata(dev);
int ret;
if (data->reg) {
ret = regulator_enable(data->reg);
if (ret) {
dev_err(dev, "Failed to enable fan supply: %d\n", ret);
return ret;
}
}
return regmap_write_bits(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_STANDBY,
~MAX6639_GCONFIG_STANDBY);
}
static const struct i2c_device_id max6639_id[] = {
{"max6639"},
{ }
};
MODULE_DEVICE_TABLE(i2c, max6639_id);
static DEFINE_SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume);
static const struct of_device_id max6639_of_match[] = {
{ .compatible = "maxim,max6639", },
{ },
};
static struct i2c_driver max6639_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "max6639",
.pm = pm_sleep_ptr(&max6639_pm_ops),
.of_match_table = max6639_of_match,
},
.probe = max6639_probe,
.id_table = max6639_id,
.detect = max6639_detect,
.address_list = normal_i2c,
};
module_i2c_driver(max6639_driver);
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
MODULE_DESCRIPTION("max6639 driver");
MODULE_LICENSE("GPL");
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