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adt7470.c
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adt7470.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* A hwmon driver for the Analog Devices ADT7470
* Copyright (C) 2007 IBM
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.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/delay.h>
#include <linux/log2.h>
#include <linux/kthread.h>
#include <linux/regmap.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/util_macros.h>
/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2C, 0x2E, 0x2F, I2C_CLIENT_END };
/* ADT7470 registers */
#define ADT7470_REG_BASE_ADDR 0x20
#define ADT7470_REG_TEMP_BASE_ADDR 0x20
#define ADT7470_REG_TEMP_MAX_ADDR 0x29
#define ADT7470_REG_FAN_BASE_ADDR 0x2A
#define ADT7470_REG_FAN_MAX_ADDR 0x31
#define ADT7470_REG_PWM_BASE_ADDR 0x32
#define ADT7470_REG_PWM_MAX_ADDR 0x35
#define ADT7470_REG_PWM_MAX_BASE_ADDR 0x38
#define ADT7470_REG_PWM_MAX_MAX_ADDR 0x3B
#define ADT7470_REG_CFG 0x40
#define ADT7470_STRT_MASK 0x01
#define ADT7470_TEST_MASK 0x02
#define ADT7470_FSPD_MASK 0x04
#define ADT7470_T05_STB_MASK 0x80
#define ADT7470_REG_ALARM1 0x41
#define ADT7470_R1T_ALARM 0x01
#define ADT7470_R2T_ALARM 0x02
#define ADT7470_R3T_ALARM 0x04
#define ADT7470_R4T_ALARM 0x08
#define ADT7470_R5T_ALARM 0x10
#define ADT7470_R6T_ALARM 0x20
#define ADT7470_R7T_ALARM 0x40
#define ADT7470_OOL_ALARM 0x80
#define ADT7470_REG_ALARM2 0x42
#define ADT7470_R8T_ALARM 0x01
#define ADT7470_R9T_ALARM 0x02
#define ADT7470_R10T_ALARM 0x04
#define ADT7470_FAN1_ALARM 0x10
#define ADT7470_FAN2_ALARM 0x20
#define ADT7470_FAN3_ALARM 0x40
#define ADT7470_FAN4_ALARM 0x80
#define ADT7470_REG_TEMP_LIMITS_BASE_ADDR 0x44
#define ADT7470_REG_TEMP_LIMITS_MAX_ADDR 0x57
#define ADT7470_REG_FAN_MIN_BASE_ADDR 0x58
#define ADT7470_REG_FAN_MIN_MAX_ADDR 0x5F
#define ADT7470_REG_FAN_MAX_BASE_ADDR 0x60
#define ADT7470_REG_FAN_MAX_MAX_ADDR 0x67
#define ADT7470_REG_PWM_CFG_BASE_ADDR 0x68
#define ADT7470_REG_PWM12_CFG 0x68
#define ADT7470_PWM2_AUTO_MASK 0x40
#define ADT7470_PWM1_AUTO_MASK 0x80
#define ADT7470_PWM_AUTO_MASK 0xC0
#define ADT7470_REG_PWM34_CFG 0x69
#define ADT7470_PWM3_AUTO_MASK 0x40
#define ADT7470_PWM4_AUTO_MASK 0x80
#define ADT7470_REG_PWM_MIN_BASE_ADDR 0x6A
#define ADT7470_REG_PWM_MIN_MAX_ADDR 0x6D
#define ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR 0x6E
#define ADT7470_REG_PWM_TEMP_MIN_MAX_ADDR 0x71
#define ADT7470_REG_CFG_2 0x74
#define ADT7470_REG_ACOUSTICS12 0x75
#define ADT7470_REG_ACOUSTICS34 0x76
#define ADT7470_REG_DEVICE 0x3D
#define ADT7470_REG_VENDOR 0x3E
#define ADT7470_REG_REVISION 0x3F
#define ADT7470_REG_ALARM1_MASK 0x72
#define ADT7470_REG_ALARM2_MASK 0x73
#define ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR 0x7C
#define ADT7470_REG_PWM_AUTO_TEMP_MAX_ADDR 0x7D
#define ADT7470_REG_MAX_ADDR 0x81
#define ADT7470_TEMP_COUNT 10
#define ADT7470_TEMP_REG(x) (ADT7470_REG_TEMP_BASE_ADDR + (x))
#define ADT7470_TEMP_MIN_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + ((x) * 2))
#define ADT7470_TEMP_MAX_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + \
((x) * 2) + 1)
#define ADT7470_FAN_COUNT 4
#define ADT7470_REG_FAN(x) (ADT7470_REG_FAN_BASE_ADDR + ((x) * 2))
#define ADT7470_REG_FAN_MIN(x) (ADT7470_REG_FAN_MIN_BASE_ADDR + ((x) * 2))
#define ADT7470_REG_FAN_MAX(x) (ADT7470_REG_FAN_MAX_BASE_ADDR + ((x) * 2))
#define ADT7470_PWM_COUNT 4
#define ADT7470_REG_PWM(x) (ADT7470_REG_PWM_BASE_ADDR + (x))
#define ADT7470_REG_PWM_MAX(x) (ADT7470_REG_PWM_MAX_BASE_ADDR + (x))
#define ADT7470_REG_PWM_MIN(x) (ADT7470_REG_PWM_MIN_BASE_ADDR + (x))
#define ADT7470_REG_PWM_TMIN(x) (ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR + (x))
#define ADT7470_REG_PWM_CFG(x) (ADT7470_REG_PWM_CFG_BASE_ADDR + ((x) / 2))
#define ADT7470_REG_PWM_AUTO_TEMP(x) (ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR + \
((x) / 2))
#define ALARM2(x) ((x) << 8)
#define ADT7470_VENDOR 0x41
#define ADT7470_DEVICE 0x70
/* datasheet only mentions a revision 2 */
#define ADT7470_REVISION 0x02
/* "all temps" according to hwmon sysfs interface spec */
#define ADT7470_PWM_ALL_TEMPS 0x3FF
/* How often do we reread sensors values? (In jiffies) */
#define SENSOR_REFRESH_INTERVAL (5 * HZ)
/* How often do we reread sensor limit values? (In jiffies) */
#define LIMIT_REFRESH_INTERVAL (60 * HZ)
/* Wait at least 200ms per sensor for 10 sensors */
#define TEMP_COLLECTION_TIME 2000
/* auto update thing won't fire more than every 2s */
#define AUTO_UPDATE_INTERVAL 2000
/* datasheet says to divide this number by the fan reading to get fan rpm */
#define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x))
#define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM
#define FAN_PERIOD_INVALID 65535
#define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID)
/* Config registers 1 and 2 include fields for selecting the PWM frequency */
#define ADT7470_CFG_LF 0x40
#define ADT7470_FREQ_MASK 0x70
#define ADT7470_FREQ_SHIFT 4
struct adt7470_data {
struct regmap *regmap;
struct mutex lock;
char sensors_valid;
char limits_valid;
unsigned long sensors_last_updated; /* In jiffies */
unsigned long limits_last_updated; /* In jiffies */
int num_temp_sensors; /* -1 = probe */
int temperatures_probed;
s8 temp[ADT7470_TEMP_COUNT];
s8 temp_min[ADT7470_TEMP_COUNT];
s8 temp_max[ADT7470_TEMP_COUNT];
u16 fan[ADT7470_FAN_COUNT];
u16 fan_min[ADT7470_FAN_COUNT];
u16 fan_max[ADT7470_FAN_COUNT];
u16 alarm;
u16 alarms_mask;
u8 force_pwm_max;
u8 pwm[ADT7470_PWM_COUNT];
u8 pwm_max[ADT7470_PWM_COUNT];
u8 pwm_automatic[ADT7470_PWM_COUNT];
u8 pwm_min[ADT7470_PWM_COUNT];
s8 pwm_tmin[ADT7470_PWM_COUNT];
u8 pwm_auto_temp[ADT7470_PWM_COUNT];
struct task_struct *auto_update;
unsigned int auto_update_interval;
};
/*
* 16-bit registers on the ADT7470 are low-byte first. The data sheet says
* that the low byte must be read before the high byte.
*/
static inline int adt7470_read_word_data(struct adt7470_data *data, unsigned int reg,
unsigned int *val)
{
u8 regval[2];
int err;
err = regmap_bulk_read(data->regmap, reg, ®val, 2);
if (err < 0)
return err;
*val = regval[0] | (regval[1] << 8);
return 0;
}
static inline int adt7470_write_word_data(struct adt7470_data *data, unsigned int reg,
unsigned int val)
{
u8 regval[2];
regval[0] = val & 0xFF;
regval[1] = val >> 8;
return regmap_bulk_write(data->regmap, reg, ®val, 2);
}
/* Probe for temperature sensors. Assumes lock is held */
static int adt7470_read_temperatures(struct adt7470_data *data)
{
unsigned long res;
unsigned int pwm_cfg[2];
int err;
int i;
u8 pwm[ADT7470_FAN_COUNT];
/* save pwm[1-4] config register */
err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(0), &pwm_cfg[0]);
if (err < 0)
return err;
err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(2), &pwm_cfg[1]);
if (err < 0)
return err;
/* set manual pwm to whatever it is set to now */
err = regmap_bulk_read(data->regmap, ADT7470_REG_PWM(0), &pwm[0],
ADT7470_PWM_COUNT);
if (err < 0)
return err;
/* put pwm in manual mode */
err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(0),
ADT7470_PWM_AUTO_MASK, 0);
if (err < 0)
return err;
err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(2),
ADT7470_PWM_AUTO_MASK, 0);
if (err < 0)
return err;
/* write pwm control to whatever it was */
err = regmap_bulk_write(data->regmap, ADT7470_REG_PWM(0), &pwm[0],
ADT7470_PWM_COUNT);
if (err < 0)
return err;
/* start reading temperature sensors */
err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
ADT7470_T05_STB_MASK, ADT7470_T05_STB_MASK);
if (err < 0)
return err;
/* Delay is 200ms * number of temp sensors. */
res = msleep_interruptible((data->num_temp_sensors >= 0 ?
data->num_temp_sensors * 200 :
TEMP_COLLECTION_TIME));
/* done reading temperature sensors */
err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
ADT7470_T05_STB_MASK, 0);
if (err < 0)
return err;
/* restore pwm[1-4] config registers */
err = regmap_write(data->regmap, ADT7470_REG_PWM_CFG(0), pwm_cfg[0]);
if (err < 0)
return err;
err = regmap_write(data->regmap, ADT7470_REG_PWM_CFG(2), pwm_cfg[1]);
if (err < 0)
return err;
if (res)
return -EAGAIN;
/* Only count fans if we have to */
if (data->num_temp_sensors >= 0)
return 0;
err = regmap_bulk_read(data->regmap, ADT7470_TEMP_REG(0), &data->temp[0],
ADT7470_TEMP_COUNT);
if (err < 0)
return err;
for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
if (data->temp[i])
data->num_temp_sensors = i + 1;
}
data->temperatures_probed = 1;
return 0;
}
static int adt7470_update_thread(void *p)
{
struct i2c_client *client = p;
struct adt7470_data *data = i2c_get_clientdata(client);
while (!kthread_should_stop()) {
mutex_lock(&data->lock);
adt7470_read_temperatures(data);
mutex_unlock(&data->lock);
if (kthread_should_stop())
break;
schedule_timeout_interruptible(msecs_to_jiffies(data->auto_update_interval));
}
return 0;
}
static int adt7470_update_sensors(struct adt7470_data *data)
{
unsigned int val;
int err;
int i;
if (!data->temperatures_probed)
err = adt7470_read_temperatures(data);
else
err = regmap_bulk_read(data->regmap, ADT7470_TEMP_REG(0), &data->temp[0],
ADT7470_TEMP_COUNT);
if (err < 0)
return err;
for (i = 0; i < ADT7470_FAN_COUNT; i++) {
err = adt7470_read_word_data(data, ADT7470_REG_FAN(i), &val);
if (err < 0)
return err;
data->fan[i] = val;
}
err = regmap_bulk_read(data->regmap, ADT7470_REG_PWM(0), &data->pwm[0], ADT7470_PWM_COUNT);
if (err < 0)
return err;
for (i = 0; i < ADT7470_PWM_COUNT; i++) {
unsigned int mask;
if (i % 2)
mask = ADT7470_PWM2_AUTO_MASK;
else
mask = ADT7470_PWM1_AUTO_MASK;
err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(i), &val);
if (err < 0)
return err;
data->pwm_automatic[i] = !!(val & mask);
err = regmap_read(data->regmap, ADT7470_REG_PWM_AUTO_TEMP(i), &val);
if (err < 0)
return err;
if (!(i % 2))
data->pwm_auto_temp[i] = val >> 4;
else
data->pwm_auto_temp[i] = val & 0xF;
}
err = regmap_read(data->regmap, ADT7470_REG_CFG, &val);
if (err < 0)
return err;
data->force_pwm_max = !!(val & ADT7470_FSPD_MASK);
err = regmap_read(data->regmap, ADT7470_REG_ALARM1, &val);
if (err < 0)
return err;
data->alarm = val;
if (data->alarm & ADT7470_OOL_ALARM) {
err = regmap_read(data->regmap, ADT7470_REG_ALARM2, &val);
if (err < 0)
return err;
data->alarm |= ALARM2(val);
}
err = adt7470_read_word_data(data, ADT7470_REG_ALARM1_MASK, &val);
if (err < 0)
return err;
data->alarms_mask = val;
return 0;
}
static int adt7470_update_limits(struct adt7470_data *data)
{
unsigned int val;
int err;
int i;
for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
err = regmap_read(data->regmap, ADT7470_TEMP_MIN_REG(i), &val);
if (err < 0)
return err;
data->temp_min[i] = (s8)val;
err = regmap_read(data->regmap, ADT7470_TEMP_MAX_REG(i), &val);
if (err < 0)
return err;
data->temp_max[i] = (s8)val;
}
for (i = 0; i < ADT7470_FAN_COUNT; i++) {
err = adt7470_read_word_data(data, ADT7470_REG_FAN_MIN(i), &val);
if (err < 0)
return err;
data->fan_min[i] = val;
err = adt7470_read_word_data(data, ADT7470_REG_FAN_MAX(i), &val);
if (err < 0)
return err;
data->fan_max[i] = val;
}
for (i = 0; i < ADT7470_PWM_COUNT; i++) {
err = regmap_read(data->regmap, ADT7470_REG_PWM_MAX(i), &val);
if (err < 0)
return err;
data->pwm_max[i] = val;
err = regmap_read(data->regmap, ADT7470_REG_PWM_MIN(i), &val);
if (err < 0)
return err;
data->pwm_min[i] = val;
err = regmap_read(data->regmap, ADT7470_REG_PWM_TMIN(i), &val);
if (err < 0)
return err;
data->pwm_tmin[i] = (s8)val;
}
return 0;
}
static struct adt7470_data *adt7470_update_device(struct device *dev)
{
struct adt7470_data *data = dev_get_drvdata(dev);
unsigned long local_jiffies = jiffies;
int need_sensors = 1;
int need_limits = 1;
int err;
/*
* Figure out if we need to update the shadow registers.
* Lockless means that we may occasionally report out of
* date data.
*/
if (time_before(local_jiffies, data->sensors_last_updated +
SENSOR_REFRESH_INTERVAL) &&
data->sensors_valid)
need_sensors = 0;
if (time_before(local_jiffies, data->limits_last_updated +
LIMIT_REFRESH_INTERVAL) &&
data->limits_valid)
need_limits = 0;
if (!need_sensors && !need_limits)
return data;
mutex_lock(&data->lock);
if (need_sensors) {
err = adt7470_update_sensors(data);
if (err < 0)
goto out;
data->sensors_last_updated = local_jiffies;
data->sensors_valid = 1;
}
if (need_limits) {
err = adt7470_update_limits(data);
if (err < 0)
goto out;
data->limits_last_updated = local_jiffies;
data->limits_valid = 1;
}
out:
mutex_unlock(&data->lock);
return err < 0 ? ERR_PTR(err) : data;
}
static ssize_t auto_update_interval_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", data->auto_update_interval);
}
static ssize_t auto_update_interval_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct adt7470_data *data = dev_get_drvdata(dev);
long temp;
if (kstrtol(buf, 10, &temp))
return -EINVAL;
temp = clamp_val(temp, 0, 60000);
mutex_lock(&data->lock);
data->auto_update_interval = temp;
mutex_unlock(&data->lock);
return count;
}
static ssize_t num_temp_sensors_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", data->num_temp_sensors);
}
static ssize_t num_temp_sensors_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct adt7470_data *data = dev_get_drvdata(dev);
long temp;
if (kstrtol(buf, 10, &temp))
return -EINVAL;
temp = clamp_val(temp, -1, 10);
mutex_lock(&data->lock);
data->num_temp_sensors = temp;
if (temp < 0)
data->temperatures_probed = 0;
mutex_unlock(&data->lock);
return count;
}
static int adt7470_temp_read(struct device *dev, u32 attr, int channel, long *val)
{
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
switch (attr) {
case hwmon_temp_input:
*val = 1000 * data->temp[channel];
break;
case hwmon_temp_min:
*val = 1000 * data->temp_min[channel];
break;
case hwmon_temp_max:
*val = 1000 * data->temp_max[channel];
break;
case hwmon_temp_alarm:
*val = !!(data->alarm & channel);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int adt7470_temp_write(struct device *dev, u32 attr, int channel, long val)
{
struct adt7470_data *data = dev_get_drvdata(dev);
int err;
val = clamp_val(val, -128000, 127000);
val = DIV_ROUND_CLOSEST(val, 1000);
switch (attr) {
case hwmon_temp_min:
mutex_lock(&data->lock);
data->temp_min[channel] = val;
err = regmap_write(data->regmap, ADT7470_TEMP_MIN_REG(channel), val);
mutex_unlock(&data->lock);
break;
case hwmon_temp_max:
mutex_lock(&data->lock);
data->temp_max[channel] = val;
err = regmap_write(data->regmap, ADT7470_TEMP_MAX_REG(channel), val);
mutex_unlock(&data->lock);
break;
default:
return -EOPNOTSUPP;
}
return err;
}
static ssize_t alarm_mask_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%x\n", data->alarms_mask);
}
static ssize_t alarm_mask_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct adt7470_data *data = dev_get_drvdata(dev);
long mask;
int err;
if (kstrtoul(buf, 0, &mask))
return -EINVAL;
if (mask & ~0xffff)
return -EINVAL;
mutex_lock(&data->lock);
data->alarms_mask = mask;
err = adt7470_write_word_data(data, ADT7470_REG_ALARM1_MASK, mask);
mutex_unlock(&data->lock);
return err < 0 ? err : count;
}
static int adt7470_fan_read(struct device *dev, u32 attr, int channel, long *val)
{
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
switch (attr) {
case hwmon_fan_input:
if (FAN_DATA_VALID(data->fan[channel]))
*val = FAN_PERIOD_TO_RPM(data->fan[channel]);
else
*val = 0;
break;
case hwmon_fan_min:
if (FAN_DATA_VALID(data->fan_min[channel]))
*val = FAN_PERIOD_TO_RPM(data->fan_min[channel]);
else
*val = 0;
break;
case hwmon_fan_max:
if (FAN_DATA_VALID(data->fan_max[channel]))
*val = FAN_PERIOD_TO_RPM(data->fan_max[channel]);
else
*val = 0;
break;
case hwmon_fan_alarm:
*val = !!(data->alarm & (1 << (12 + channel)));
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int adt7470_fan_write(struct device *dev, u32 attr, int channel, long val)
{
struct adt7470_data *data = dev_get_drvdata(dev);
int err;
if (val <= 0)
return -EINVAL;
val = FAN_RPM_TO_PERIOD(val);
val = clamp_val(val, 1, 65534);
switch (attr) {
case hwmon_fan_min:
mutex_lock(&data->lock);
data->fan_min[channel] = val;
err = adt7470_write_word_data(data, ADT7470_REG_FAN_MIN(channel), val);
mutex_unlock(&data->lock);
break;
case hwmon_fan_max:
mutex_lock(&data->lock);
data->fan_max[channel] = val;
err = adt7470_write_word_data(data, ADT7470_REG_FAN_MAX(channel), val);
mutex_unlock(&data->lock);
break;
default:
return -EOPNOTSUPP;
}
return err;
}
static ssize_t force_pwm_max_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", data->force_pwm_max);
}
static ssize_t force_pwm_max_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct adt7470_data *data = dev_get_drvdata(dev);
long temp;
int err;
if (kstrtol(buf, 10, &temp))
return -EINVAL;
mutex_lock(&data->lock);
data->force_pwm_max = temp;
err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
ADT7470_FSPD_MASK,
temp ? ADT7470_FSPD_MASK : 0);
mutex_unlock(&data->lock);
return err < 0 ? err : count;
}
/* These are the valid PWM frequencies to the nearest Hz */
static const int adt7470_freq_map[] = {
11, 15, 22, 29, 35, 44, 59, 88, 1400, 22500
};
static int pwm1_freq_get(struct device *dev)
{
struct adt7470_data *data = dev_get_drvdata(dev);
unsigned int cfg_reg_1, cfg_reg_2;
int index;
int err;
mutex_lock(&data->lock);
err = regmap_read(data->regmap, ADT7470_REG_CFG, &cfg_reg_1);
if (err < 0)
goto out;
err = regmap_read(data->regmap, ADT7470_REG_CFG_2, &cfg_reg_2);
if (err < 0)
goto out;
mutex_unlock(&data->lock);
index = (cfg_reg_2 & ADT7470_FREQ_MASK) >> ADT7470_FREQ_SHIFT;
if (!(cfg_reg_1 & ADT7470_CFG_LF))
index += 8;
if (index >= ARRAY_SIZE(adt7470_freq_map))
index = ARRAY_SIZE(adt7470_freq_map) - 1;
return adt7470_freq_map[index];
out:
mutex_unlock(&data->lock);
return err;
}
static int adt7470_pwm_read(struct device *dev, u32 attr, int channel, long *val)
{
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
switch (attr) {
case hwmon_pwm_input:
*val = data->pwm[channel];
break;
case hwmon_pwm_enable:
*val = 1 + data->pwm_automatic[channel];
break;
case hwmon_pwm_freq:
*val = pwm1_freq_get(dev);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int pwm1_freq_set(struct device *dev, long freq)
{
struct adt7470_data *data = dev_get_drvdata(dev);
unsigned int low_freq = ADT7470_CFG_LF;
int index;
int err;
/* Round the user value given to the closest available frequency */
index = find_closest(freq, adt7470_freq_map,
ARRAY_SIZE(adt7470_freq_map));
if (index >= 8) {
index -= 8;
low_freq = 0;
}
mutex_lock(&data->lock);
/* Configuration Register 1 */
err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
ADT7470_CFG_LF, low_freq);
if (err < 0)
goto out;
/* Configuration Register 2 */
err = regmap_update_bits(data->regmap, ADT7470_REG_CFG_2,
ADT7470_FREQ_MASK,
index << ADT7470_FREQ_SHIFT);
out:
mutex_unlock(&data->lock);
return err;
}
static int adt7470_pwm_write(struct device *dev, u32 attr, int channel, long val)
{
struct adt7470_data *data = dev_get_drvdata(dev);
unsigned int pwm_auto_reg_mask;
int err;
switch (attr) {
case hwmon_pwm_input:
val = clamp_val(val, 0, 255);
mutex_lock(&data->lock);
data->pwm[channel] = val;
err = regmap_write(data->regmap, ADT7470_REG_PWM(channel),
data->pwm[channel]);
mutex_unlock(&data->lock);
break;
case hwmon_pwm_enable:
if (channel % 2)
pwm_auto_reg_mask = ADT7470_PWM2_AUTO_MASK;
else
pwm_auto_reg_mask = ADT7470_PWM1_AUTO_MASK;
if (val != 2 && val != 1)
return -EINVAL;
val--;
mutex_lock(&data->lock);
data->pwm_automatic[channel] = val;
err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(channel),
pwm_auto_reg_mask,
val ? pwm_auto_reg_mask : 0);
mutex_unlock(&data->lock);
break;
case hwmon_pwm_freq:
err = pwm1_freq_set(dev, val);
break;
default:
return -EOPNOTSUPP;
}
return err;
}
static ssize_t pwm_max_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", data->pwm_max[attr->index]);
}
static ssize_t pwm_max_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adt7470_data *data = dev_get_drvdata(dev);
long temp;
int err;
if (kstrtol(buf, 10, &temp))
return -EINVAL;
temp = clamp_val(temp, 0, 255);
mutex_lock(&data->lock);
data->pwm_max[attr->index] = temp;
err = regmap_write(data->regmap, ADT7470_REG_PWM_MAX(attr->index),
temp);
mutex_unlock(&data->lock);
return err < 0 ? err : count;
}
static ssize_t pwm_min_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", data->pwm_min[attr->index]);
}
static ssize_t pwm_min_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adt7470_data *data = dev_get_drvdata(dev);
long temp;
int err;
if (kstrtol(buf, 10, &temp))
return -EINVAL;
temp = clamp_val(temp, 0, 255);
mutex_lock(&data->lock);
data->pwm_min[attr->index] = temp;
err = regmap_write(data->regmap, ADT7470_REG_PWM_MIN(attr->index),
temp);
mutex_unlock(&data->lock);
return err < 0 ? err : count;
}
static ssize_t pwm_tmax_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
/* the datasheet says that tmax = tmin + 20C */
return sprintf(buf, "%d\n", 1000 * (20 + data->pwm_tmin[attr->index]));
}
static ssize_t pwm_tmin_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adt7470_data *data = adt7470_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", 1000 * data->pwm_tmin[attr->index]);
}
static ssize_t pwm_tmin_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adt7470_data *data = dev_get_drvdata(dev);
long temp;
int err;
if (kstrtol(buf, 10, &temp))
return -EINVAL;
temp = clamp_val(temp, -128000, 127000);
temp = DIV_ROUND_CLOSEST(temp, 1000);
mutex_lock(&data->lock);
data->pwm_tmin[attr->index] = temp;
err = regmap_write(data->regmap, ADT7470_REG_PWM_TMIN(attr->index),
temp);
mutex_unlock(&data->lock);
return err < 0 ? err : count;
}
static ssize_t pwm_auto_temp_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adt7470_data *data = adt7470_update_device(dev);
u8 ctrl;
if (IS_ERR(data))
return PTR_ERR(data);
ctrl = data->pwm_auto_temp[attr->index];
if (ctrl)
return sprintf(buf, "%d\n", 1 << (ctrl - 1));
else
return sprintf(buf, "%d\n", ADT7470_PWM_ALL_TEMPS);
}
static int cvt_auto_temp(int input)
{
if (input == ADT7470_PWM_ALL_TEMPS)
return 0;
if (input < 1 || !is_power_of_2(input))
return -EINVAL;
return ilog2(input) + 1;
}