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linux/drivers/hwmon/max31760.c
Ibrahim Tilki 38b04ad02d drivers: hwmon: Add max31760 fan speed controller driver 
MAX31760 is a precision fan speed controller with nonvolatile lookup table.
Device has one internal and one external temperature sensor support.
Controls two fans and measures their speeds. Generates hardware alerts when
programmable max and critical temperatures are exceeded.

Signed-off-by: Ibrahim Tilki <Ibrahim.Tilki@analog.com>
Reviewed-by: Nurettin Bolucu <Nurettin.Bolucu@analog.com>
Link: https://lore.kernel.org/r/20220910171945.48088-2-Ibrahim.Tilki@analog.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2022-09-20 07:10:58 -07:00

597 lines
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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/util_macros.h>
#define REG_CR1 0x00
#define CR1_HYST BIT(5)
#define CR1_DRV GENMASK(4, 3)
#define CR1_TEMP_SRC GENMASK(1, 0)
#define REG_CR2 0x01
#define CR2_STBY BIT(7)
#define CR2_ALERTS BIT(6)
#define CR2_DFC BIT(0)
#define REG_CR3 0x02
#define REG_PWMR 0x50
#define REG_PWMV 0x51
#define REG_STATUS 0x5A
#define STATUS_ALARM_CRIT(ch) BIT(2 + 2 * (ch))
#define STATUS_ALARM_MAX(ch) BIT(3 + 2 * (ch))
#define STATUS_RDFA BIT(6)
#define REG_TACH(ch) (0x52 + (ch) * 2)
#define REG_TEMP_INPUT(ch) (0x56 + (ch) * 2)
#define REG_TEMP_MAX(ch) (0x06 + (ch) * 2)
#define REG_TEMP_CRIT(ch) (0x0A + (ch) * 2)
#define TEMP11_FROM_REG(reg) ((reg) / 32 * 125)
#define TEMP11_TO_REG(val) (DIV_ROUND_CLOSEST(clamp_val((val), -128000, \
127875), 125) * 32)
#define LUT_SIZE 48
#define REG_LUT(index) (0x20 + (index))
struct max31760_state {
struct regmap *regmap;
struct lut_attribute {
char name[24];
struct sensor_device_attribute sda;
} lut[LUT_SIZE];
struct attribute *attrs[LUT_SIZE + 2];
struct attribute_group group;
const struct attribute_group *groups[2];
};
static bool max31760_volatile_reg(struct device *dev, unsigned int reg)
{
return reg > 0x50;
}
static const struct regmap_config regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x5B,
.cache_type = REGCACHE_RBTREE,
.volatile_reg = max31760_volatile_reg,
};
static const int max31760_pwm_freq[] = {33, 150, 1500, 25000};
static int tach_to_rpm(u16 tach)
{
if (tach == 0)
tach = 1;
return 60 * 100000 / tach / 2;
}
static int max31760_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
struct max31760_state *state = dev_get_drvdata(dev);
unsigned int regval;
unsigned int reg_temp;
s16 temp;
u8 reg[2];
int ret;
switch (type) {
case hwmon_temp:
switch (attr) {
case hwmon_temp_fault:
ret = regmap_read(state->regmap, REG_STATUS, &regval);
if (ret)
return ret;
*val = FIELD_GET(STATUS_RDFA, regval);
return 0;
case hwmon_temp_max_alarm:
ret = regmap_read(state->regmap, REG_STATUS, &regval);
if (ret)
return ret;
if (channel)
*val = FIELD_GET(STATUS_ALARM_MAX(1), regval);
else
*val = FIELD_GET(STATUS_ALARM_MAX(0), regval);
return 0;
case hwmon_temp_crit_alarm:
ret = regmap_read(state->regmap, REG_STATUS, &regval);
if (ret)
return ret;
if (channel)
*val = FIELD_GET(STATUS_ALARM_CRIT(1), regval);
else
*val = FIELD_GET(STATUS_ALARM_CRIT(0), regval);
return 0;
case hwmon_temp_input:
reg_temp = REG_TEMP_INPUT(channel);
break;
case hwmon_temp_max:
reg_temp = REG_TEMP_MAX(channel);
break;
case hwmon_temp_crit:
reg_temp = REG_TEMP_CRIT(channel);
break;
default:
return -EOPNOTSUPP;
}
ret = regmap_bulk_read(state->regmap, reg_temp, reg, 2);
if (ret)
return ret;
temp = (reg[0] << 8) | reg[1];
*val = TEMP11_FROM_REG(temp);
return 0;
case hwmon_fan:
switch (attr) {
case hwmon_fan_input:
ret = regmap_bulk_read(state->regmap, REG_TACH(channel), reg, 2);
if (ret)
return ret;
*val = tach_to_rpm(reg[0] * 256 + reg[1]);
return 0;
case hwmon_fan_fault:
ret = regmap_read(state->regmap, REG_STATUS, &regval);
if (ret)
return ret;
if (channel)
*val = FIELD_GET(BIT(1), regval);
else
*val = FIELD_GET(BIT(0), regval);
return 0;
case hwmon_fan_enable:
ret = regmap_read(state->regmap, REG_CR3, &regval);
if (ret)
return ret;
if (channel)
*val = FIELD_GET(BIT(1), regval);
else
*val = FIELD_GET(BIT(0), regval);
return 0;
default:
return -EOPNOTSUPP;
}
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_input:
ret = regmap_read(state->regmap, REG_PWMV, &regval);
if (ret)
return ret;
*val = regval;
return 0;
case hwmon_pwm_freq:
ret = regmap_read(state->regmap, REG_CR1, &regval);
if (ret)
return ret;
regval = FIELD_GET(CR1_DRV, regval);
if (regval >= ARRAY_SIZE(max31760_pwm_freq))
return -EINVAL;
*val = max31760_pwm_freq[regval];
return 0;
case hwmon_pwm_enable:
ret = regmap_read(state->regmap, REG_CR2, &regval);
if (ret)
return ret;
*val = 2 - FIELD_GET(CR2_DFC, regval);
return 0;
case hwmon_pwm_auto_channels_temp:
ret = regmap_read(state->regmap, REG_CR1, &regval);
if (ret)
return ret;
switch (FIELD_GET(CR1_TEMP_SRC, regval)) {
case 0:
*val = 2;
break;
case 1:
*val = 1;
break;
case 2:
case 3:
*val = 3;
break;
default:
return -EINVAL;
}
return 0;
default:
return -EOPNOTSUPP;
}
default:
return -EOPNOTSUPP;
}
}
static int max31760_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
struct max31760_state *state = dev_get_drvdata(dev);
unsigned int pwm_index;
unsigned int reg_temp;
int temp;
u8 reg_val[2];
switch (type) {
case hwmon_temp:
switch (attr) {
case hwmon_temp_max:
reg_temp = REG_TEMP_MAX(channel);
break;
case hwmon_temp_crit:
reg_temp = REG_TEMP_CRIT(channel);
break;
default:
return -EOPNOTSUPP;
}
temp = TEMP11_TO_REG(val);
reg_val[0] = temp >> 8;
reg_val[1] = temp & 0xFF;
return regmap_bulk_write(state->regmap, reg_temp, reg_val, 2);
case hwmon_fan:
switch (attr) {
case hwmon_fan_enable:
if (val == 0)
return regmap_clear_bits(state->regmap, REG_CR3, BIT(channel));
if (val == 1)
return regmap_set_bits(state->regmap, REG_CR3, BIT(channel));
return -EINVAL;
default:
return -EOPNOTSUPP;
}
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_input:
if (val < 0 || val > 255)
return -EINVAL;
return regmap_write(state->regmap, REG_PWMR, val);
case hwmon_pwm_enable:
if (val == 1)
return regmap_set_bits(state->regmap, REG_CR2, CR2_DFC);
if (val == 2)
return regmap_clear_bits(state->regmap, REG_CR2, CR2_DFC);
return -EINVAL;
case hwmon_pwm_freq:
pwm_index = find_closest(val, max31760_pwm_freq,
ARRAY_SIZE(max31760_pwm_freq));
return regmap_update_bits(state->regmap,
REG_CR1, CR1_DRV,
FIELD_PREP(CR1_DRV, pwm_index));
case hwmon_pwm_auto_channels_temp:
switch (val) {
case 1:
break;
case 2:
val = 0;
break;
case 3:
val = 2;
break;
default:
return -EINVAL;
}
return regmap_update_bits(state->regmap, REG_CR1, CR1_TEMP_SRC, val);
default:
return -EOPNOTSUPP;
}
default:
return -EOPNOTSUPP;
}
}
static const struct hwmon_channel_info *max31760_info[] = {
HWMON_CHANNEL_INFO(chip,
HWMON_C_REGISTER_TZ),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_FAULT | HWMON_F_ENABLE,
HWMON_F_INPUT | HWMON_F_FAULT | HWMON_F_ENABLE),
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_FAULT |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_LABEL),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_ENABLE | HWMON_PWM_FREQ | HWMON_PWM_INPUT |
HWMON_PWM_AUTO_CHANNELS_TEMP),
NULL
};
static umode_t max31760_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (type) {
case hwmon_temp:
switch (attr) {
case hwmon_temp_input:
case hwmon_temp_max_alarm:
case hwmon_temp_crit_alarm:
case hwmon_temp_fault:
case hwmon_temp_label:
return 0444;
case hwmon_temp_max:
case hwmon_temp_crit:
return 0644;
default:
return 0;
}
case hwmon_fan:
switch (attr) {
case hwmon_fan_input:
case hwmon_fan_fault:
return 0444;
case hwmon_fan_enable:
return 0644;
default:
return 0;
}
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_enable:
case hwmon_pwm_input:
case hwmon_pwm_freq:
case hwmon_pwm_auto_channels_temp:
return 0644;
default:
return 0;
}
default:
return 0;
}
}
static int max31760_read_string(struct device *dev,
enum hwmon_sensor_types type,
u32 attr, int channel, const char **str)
{
switch (type) {
case hwmon_temp:
if (attr != hwmon_temp_label)
return -EOPNOTSUPP;
*str = channel ? "local" : "remote";
return 0;
default:
return -EOPNOTSUPP;
}
}
static const struct hwmon_ops max31760_hwmon_ops = {
.is_visible = max31760_is_visible,
.read = max31760_read,
.write = max31760_write,
.read_string = max31760_read_string
};
static const struct hwmon_chip_info max31760_chip_info = {
.ops = &max31760_hwmon_ops,
.info = max31760_info,
};
static ssize_t lut_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *sda = to_sensor_dev_attr(devattr);
struct max31760_state *state = dev_get_drvdata(dev);
int ret;
unsigned int regval;
ret = regmap_read(state->regmap, REG_LUT(sda->index), &regval);
if (ret)
return ret;
return sysfs_emit(buf, "%d\n", regval);
}
static ssize_t lut_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *sda = to_sensor_dev_attr(devattr);
struct max31760_state *state = dev_get_drvdata(dev);
int ret;
u8 pwm;
ret = kstrtou8(buf, 10, &pwm);
if (ret)
return ret;
ret = regmap_write(state->regmap, REG_LUT(sda->index), pwm);
if (ret)
return ret;
return count;
}
static ssize_t pwm1_auto_point_temp_hyst_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct max31760_state *state = dev_get_drvdata(dev);
unsigned int regval;
int ret;
ret = regmap_read(state->regmap, REG_CR1, &regval);
if (ret)
return ret;
return sysfs_emit(buf, "%d\n", (1 + (int)FIELD_GET(CR1_HYST, regval)) * 2000);
}
static ssize_t pwm1_auto_point_temp_hyst_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
struct max31760_state *state = dev_get_drvdata(dev);
unsigned int hyst;
int ret;
ret = kstrtou32(buf, 10, &hyst);
if (ret)
return ret;
if (hyst < 3000)
ret = regmap_clear_bits(state->regmap, REG_CR1, CR1_HYST);
else
ret = regmap_set_bits(state->regmap, REG_CR1, CR1_HYST);
if (ret)
return ret;
return count;
}
static DEVICE_ATTR_RW(pwm1_auto_point_temp_hyst);
static void max31760_create_lut_nodes(struct max31760_state *state)
{
int i;
struct sensor_device_attribute *sda;
struct lut_attribute *lut;
for (i = 0; i < LUT_SIZE; ++i) {
lut = &state->lut[i];
sda = &lut->sda;
snprintf(lut->name, sizeof(lut->name),
"pwm1_auto_point%d_pwm", i + 1);
sda->dev_attr.attr.mode = 0644;
sda->index = i;
sda->dev_attr.show = lut_show;
sda->dev_attr.store = lut_store;
sda->dev_attr.attr.name = lut->name;
sysfs_attr_init(&sda->dev_attr.attr);
state->attrs[i] = &sda->dev_attr.attr;
}
state->attrs[i] = &dev_attr_pwm1_auto_point_temp_hyst.attr;
state->group.attrs = state->attrs;
state->groups[0] = &state->group;
}
static int max31760_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct max31760_state *state;
struct device *hwmon_dev;
int ret;
state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
if (!state)
return -ENOMEM;
state->regmap = devm_regmap_init_i2c(client, &regmap_config);
if (IS_ERR(state->regmap))
return dev_err_probe(dev,
PTR_ERR(state->regmap),
"regmap initialization failed\n");
dev_set_drvdata(dev, state);
/* Set alert output to comparator mode */
ret = regmap_set_bits(state->regmap, REG_CR2, CR2_ALERTS);
if (ret)
return dev_err_probe(dev, ret, "cannot write register\n");
max31760_create_lut_nodes(state);
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
state,
&max31760_chip_info,
state->groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct of_device_id max31760_of_match[] = {
{.compatible = "adi,max31760"},
{ }
};
MODULE_DEVICE_TABLE(of, max31760_of_match);
static const struct i2c_device_id max31760_id[] = {
{"max31760"},
{ }
};
MODULE_DEVICE_TABLE(i2c, max31760_id);
static int max31760_suspend(struct device *dev)
{
struct max31760_state *state = dev_get_drvdata(dev);
return regmap_set_bits(state->regmap, REG_CR2, CR2_STBY);
}
static int max31760_resume(struct device *dev)
{
struct max31760_state *state = dev_get_drvdata(dev);
return regmap_clear_bits(state->regmap, REG_CR2, CR2_STBY);
}
static DEFINE_SIMPLE_DEV_PM_OPS(max31760_pm_ops, max31760_suspend,
max31760_resume);
static struct i2c_driver max31760_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "max31760",
.of_match_table = max31760_of_match,
.pm = pm_ptr(&max31760_pm_ops)
},
.probe_new = max31760_probe,
.id_table = max31760_id
};
module_i2c_driver(max31760_driver);
MODULE_AUTHOR("Ibrahim Tilki <Ibrahim.Tilki@analog.com>");
MODULE_DESCRIPTION("Analog Devices MAX31760 Fan Speed Controller");
MODULE_SOFTDEP("pre: regmap_i2c");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL");
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