596 lines
13 KiB
C
596 lines
13 KiB
C
// 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_MAPLE,
|
|
.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, ®val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*val = FIELD_GET(STATUS_RDFA, regval);
|
|
|
|
return 0;
|
|
case hwmon_temp_max_alarm:
|
|
ret = regmap_read(state->regmap, REG_STATUS, ®val);
|
|
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, ®val);
|
|
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, ®val);
|
|
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, ®val);
|
|
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, ®val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*val = regval;
|
|
|
|
return 0;
|
|
case hwmon_pwm_freq:
|
|
ret = regmap_read(state->regmap, REG_CR1, ®val);
|
|
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, ®val);
|
|
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, ®val);
|
|
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 * const 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), ®val);
|
|
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, ®val);
|
|
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, ®map_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 = {
|
|
.driver = {
|
|
.name = "max31760",
|
|
.of_match_table = max31760_of_match,
|
|
.pm = pm_ptr(&max31760_pm_ops)
|
|
},
|
|
.probe = 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");
|