// SPDX-License-Identifier: GPL-2.0-or-later
/*
* amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si>
*
* Based on max6650.c:
* Copyright (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
*
* Conversion to regmap and with_info API:
* Copyright (C) 2024 Guenter Roeck <linux@roeck-us.net>
*/
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/bits.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/minmax.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_platform.h>
#include <linux/pwm.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/thermal.h>
#include <dt-bindings/pwm/pwm.h>
/*
* Addresses to scan.
*/
static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
/*
* Insmod parameters
*/
static int pwminv = -1; /*Inverted PWM output. */
module_param(pwminv, int, 0444);
static int init = 1; /*Power-on initialization.*/
module_param(init, int, 0444);
#define AMC6821_REG_DEV_ID 0x3D
#define AMC6821_REG_COMP_ID 0x3E
#define AMC6821_REG_CONF1 0x00
#define AMC6821_REG_CONF2 0x01
#define AMC6821_REG_CONF3 0x3F
#define AMC6821_REG_CONF4 0x04
#define AMC6821_REG_STAT1 0x02
#define AMC6821_REG_STAT2 0x03
#define AMC6821_REG_TEMP_LO 0x06
#define AMC6821_REG_TDATA_LOW 0x08
#define AMC6821_REG_TDATA_HI 0x09
#define AMC6821_REG_LTEMP_HI 0x0A
#define AMC6821_REG_RTEMP_HI 0x0B
#define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
#define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
#define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
#define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
#define AMC6821_REG_LTEMP_CRIT 0x1B
#define AMC6821_REG_RTEMP_CRIT 0x1D
#define AMC6821_REG_PSV_TEMP 0x1C
#define AMC6821_REG_DCY 0x22
#define AMC6821_REG_LTEMP_FAN_CTRL 0x24
#define AMC6821_REG_RTEMP_FAN_CTRL 0x25
#define AMC6821_REG_DCY_LOW_TEMP 0x21
#define AMC6821_REG_TACH_LLIMITL 0x10
#define AMC6821_REG_TACH_HLIMITL 0x12
#define AMC6821_REG_TACH_SETTINGL 0x1e
#define AMC6821_CONF1_START BIT(0)
#define AMC6821_CONF1_FAN_INT_EN BIT(1)
#define AMC6821_CONF1_FANIE BIT(2)
#define AMC6821_CONF1_PWMINV BIT(3)
#define AMC6821_CONF1_FAN_FAULT_EN BIT(4)
#define AMC6821_CONF1_FDRC0 BIT(5)
#define AMC6821_CONF1_FDRC1 BIT(6)
#define AMC6821_CONF1_THERMOVIE BIT(7)
#define AMC6821_CONF2_PWM_EN BIT(0)
#define AMC6821_CONF2_TACH_MODE BIT(1)
#define AMC6821_CONF2_TACH_EN BIT(2)
#define AMC6821_CONF2_RTFIE BIT(3)
#define AMC6821_CONF2_LTOIE BIT(4)
#define AMC6821_CONF2_RTOIE BIT(5)
#define AMC6821_CONF2_PSVIE BIT(6)
#define AMC6821_CONF2_RST BIT(7)
#define AMC6821_CONF3_THERM_FAN_EN BIT(7)
#define AMC6821_CONF3_REV_MASK GENMASK(3, 0)
#define AMC6821_CONF4_OVREN BIT(4)
#define AMC6821_CONF4_TACH_FAST BIT(5)
#define AMC6821_CONF4_PSPR BIT(6)
#define AMC6821_CONF4_MODE BIT(7)
#define AMC6821_STAT1_RPM_ALARM BIT(0)
#define AMC6821_STAT1_FANS BIT(1)
#define AMC6821_STAT1_RTH BIT(2)
#define AMC6821_STAT1_RTL BIT(3)
#define AMC6821_STAT1_R_THERM BIT(4)
#define AMC6821_STAT1_RTF BIT(5)
#define AMC6821_STAT1_LTH BIT(6)
#define AMC6821_STAT1_LTL BIT(7)
#define AMC6821_STAT2_RTC BIT(3)
#define AMC6821_STAT2_LTC BIT(4)
#define AMC6821_STAT2_LPSV BIT(5)
#define AMC6821_STAT2_L_THERM BIT(6)
#define AMC6821_STAT2_THERM_IN BIT(7)
#define AMC6821_TEMP_SLOPE_MASK GENMASK(2, 0)
#define AMC6821_TEMP_LIMIT_MASK GENMASK(7, 3)
/*
* Client data (each client gets its own)
*/
struct amc6821_data {
struct regmap *regmap;
struct mutex update_lock;
unsigned long fan_state;
unsigned long fan_max_state;
unsigned int *fan_cooling_levels;
enum pwm_polarity pwm_polarity;
};
/*
* Return 0 on success or negative error code.
*
* temps returns set of three temperatures, in °C:
* temps[0]: Passive cooling temperature, applies to both channels
* temps[1]: Low temperature, start slope calculations
* temps[2]: High temperature
*
* Channel 0: local, channel 1: remote.
*/
static int amc6821_get_auto_point_temps(struct regmap *regmap, int channel, u8 *temps)
{
u32 regs[] = {
AMC6821_REG_DCY_LOW_TEMP,
AMC6821_REG_PSV_TEMP,
channel ? AMC6821_REG_RTEMP_FAN_CTRL : AMC6821_REG_LTEMP_FAN_CTRL
};
u8 regvals[3];
int slope;
int err;
err = regmap_multi_reg_read(regmap, regs, regvals, 3);
if (err)
return err;
temps[0] = regvals[1];
temps[1] = FIELD_GET(AMC6821_TEMP_LIMIT_MASK, regvals[2]) * 4;
/* slope is 32 >> <slope bits> in °C */
slope = 32 >> FIELD_GET(AMC6821_TEMP_SLOPE_MASK, regvals[2]);
if (slope)
temps[2] = temps[1] + DIV_ROUND_CLOSEST(255 - regvals[0], slope);
else
temps[2] = 255;
return 0;
}
static int amc6821_temp_read_values(struct regmap *regmap, u32 attr, int channel, long *val)
{
int reg, err;
u32 regval;
switch (attr) {
case hwmon_temp_input:
reg = channel ? AMC6821_REG_RTEMP_HI : AMC6821_REG_LTEMP_HI;
break;
case hwmon_temp_min:
reg = channel ? AMC6821_REG_RTEMP_LIMIT_MIN : AMC6821_REG_LTEMP_LIMIT_MIN;
break;
case hwmon_temp_max:
reg = channel ? AMC6821_REG_RTEMP_LIMIT_MAX : AMC6821_REG_LTEMP_LIMIT_MAX;
break;
case hwmon_temp_crit:
reg = channel ? AMC6821_REG_RTEMP_CRIT : AMC6821_REG_LTEMP_CRIT;
break;
default:
return -EOPNOTSUPP;
}
err = regmap_read(regmap, reg, ®val);
if (err)
return err;
*val = sign_extend32(regval, 7) * 1000;
return 0;
}
static int amc6821_read_alarms(struct regmap *regmap, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
int reg, mask, err;
u32 regval;
switch (type) {
case hwmon_temp:
switch (attr) {
case hwmon_temp_min_alarm:
reg = AMC6821_REG_STAT1;
mask = channel ? AMC6821_STAT1_RTL : AMC6821_STAT1_LTL;
break;
case hwmon_temp_max_alarm:
reg = AMC6821_REG_STAT1;
mask = channel ? AMC6821_STAT1_RTH : AMC6821_STAT1_LTH;
break;
case hwmon_temp_crit_alarm:
reg = AMC6821_REG_STAT2;
mask = channel ? AMC6821_STAT2_RTC : AMC6821_STAT2_LTC;
break;
case hwmon_temp_fault:
reg = AMC6821_REG_STAT1;
mask = AMC6821_STAT1_RTF;
break;
default:
return -EOPNOTSUPP;
}
break;
case hwmon_fan:
switch (attr) {
case hwmon_fan_fault:
reg = AMC6821_REG_STAT1;
mask = AMC6821_STAT1_FANS;
break;
default:
return -EOPNOTSUPP;
}
break;
default:
return -EOPNOTSUPP;
}
err = regmap_read(regmap, reg, ®val);
if (err)
return err;
*val = !!(regval & mask);
return 0;
}
static int amc6821_temp_read(struct device *dev, u32 attr, int channel, long *val)
{
struct amc6821_data *data = dev_get_drvdata(dev);
switch (attr) {
case hwmon_temp_input:
case hwmon_temp_min:
case hwmon_temp_max:
case hwmon_temp_crit:
return amc6821_temp_read_values(data->regmap, attr, channel, val);
case hwmon_temp_min_alarm:
case hwmon_temp_max_alarm:
case hwmon_temp_crit_alarm:
case hwmon_temp_fault:
return amc6821_read_alarms(data->regmap, hwmon_temp, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static int amc6821_temp_write(struct device *dev, u32 attr, int channel, long val)
{
struct amc6821_data *data = dev_get_drvdata(dev);
int reg;
val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
switch (attr) {
case hwmon_temp_min:
reg = channel ? AMC6821_REG_RTEMP_LIMIT_MIN : AMC6821_REG_LTEMP_LIMIT_MIN;
break;
case hwmon_temp_max:
reg = channel ? AMC6821_REG_RTEMP_LIMIT_MAX : AMC6821_REG_LTEMP_LIMIT_MAX;
break;
case hwmon_temp_crit:
reg = channel ? AMC6821_REG_RTEMP_CRIT : AMC6821_REG_LTEMP_CRIT;
break;
default:
return -EOPNOTSUPP;
}
return regmap_write(data->regmap, reg, val);
}
static int amc6821_pwm_read(struct device *dev, u32 attr, long *val)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct regmap *regmap = data->regmap;
u32 regval;
int err;
switch (attr) {
case hwmon_pwm_enable:
err = regmap_read(regmap, AMC6821_REG_CONF1, ®val);
if (err)
return err;
switch (regval & (AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1)) {
case 0:
*val = 1; /* manual */
break;
case AMC6821_CONF1_FDRC0:
*val = 4; /* target rpm (fan1_target) controlled */
break;
case AMC6821_CONF1_FDRC1:
*val = 2; /* remote temp controlled */
break;
default:
*val = 3; /* max(local, remote) temp controlled */
break;
}
return 0;
case hwmon_pwm_mode:
err = regmap_read(regmap, AMC6821_REG_CONF2, ®val);
if (err)
return err;
*val = !!(regval & AMC6821_CONF2_TACH_MODE);
return 0;
case hwmon_pwm_auto_channels_temp:
err = regmap_read(regmap, AMC6821_REG_CONF1, ®val);
if (err)
return err;
switch (regval & (AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1)) {
case 0:
case AMC6821_CONF1_FDRC0:
*val = 0; /* manual or target rpm controlled */
break;
case AMC6821_CONF1_FDRC1:
*val = 2; /* remote temp controlled */
break;
default:
*val = 3; /* max(local, remote) temp controlled */
break;
}
return 0;
case hwmon_pwm_input:
err = regmap_read(regmap, AMC6821_REG_DCY, ®val);
if (err)
return err;
*val = regval;
return 0;
default:
return -EOPNOTSUPP;
}
}
static int amc6821_pwm_write(struct device *dev, u32 attr, long val)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct regmap *regmap = data->regmap;
u32 mode;
switch (attr) {
case hwmon_pwm_enable:
switch (val) {
case 1:
mode = 0;
break;
case 2:
mode = AMC6821_CONF1_FDRC1;
break;
case 3:
mode = AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1;
break;
case 4:
mode = AMC6821_CONF1_FDRC0;
break;
default:
return -EINVAL;
}
return regmap_update_bits(regmap, AMC6821_REG_CONF1,
AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1,
mode);
case hwmon_pwm_mode:
if (val < 0 || val > 1)
return -EINVAL;
return regmap_update_bits(regmap, AMC6821_REG_CONF2,
AMC6821_CONF2_TACH_MODE,
val ? AMC6821_CONF2_TACH_MODE : 0);
break;
case hwmon_pwm_input:
if (val < 0 || val > 255)
return -EINVAL;
return regmap_write(regmap, AMC6821_REG_DCY, val);
default:
return -EOPNOTSUPP;
}
}
static int amc6821_fan_read_rpm(struct regmap *regmap, u32 attr, long *val)
{
int reg, err;
u8 regs[2];
u32 regval;
switch (attr) {
case hwmon_fan_input:
reg = AMC6821_REG_TDATA_LOW;
break;
case hwmon_fan_min:
reg = AMC6821_REG_TACH_LLIMITL;
break;
case hwmon_fan_max:
reg = AMC6821_REG_TACH_HLIMITL;
break;
case hwmon_fan_target:
reg = AMC6821_REG_TACH_SETTINGL;
break;
default:
return -EOPNOTSUPP;
}
err = regmap_bulk_read(regmap, reg, regs, 2);
if (err)
return err;
regval = (regs[1] << 8) | regs[0];
*val = regval ? 6000000 / regval : 0;
return 0;
}
static int amc6821_fan_read(struct device *dev, u32 attr, long *val)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct regmap *regmap = data->regmap;
u32 regval;
int err;
switch (attr) {
case hwmon_fan_input:
case hwmon_fan_min:
case hwmon_fan_max:
case hwmon_fan_target:
return amc6821_fan_read_rpm(regmap, attr, val);
case hwmon_fan_fault:
return amc6821_read_alarms(regmap, hwmon_fan, attr, 0, val);
case hwmon_fan_pulses:
err = regmap_read(regmap, AMC6821_REG_CONF4, ®val);
if (err)
return err;
*val = (regval & AMC6821_CONF4_PSPR) ? 4 : 2;
return 0;
default:
return -EOPNOTSUPP;
}
}
static int amc6821_fan_write(struct device *dev, u32 attr, long val)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct regmap *regmap = data->regmap;
u8 regs[2];
int reg;
if (attr == hwmon_fan_pulses) {
if (val != 2 && val != 4)
return -EINVAL;
return regmap_update_bits(regmap, AMC6821_REG_CONF4,
AMC6821_CONF4_PSPR,
val == 4 ? AMC6821_CONF4_PSPR : 0);
}
if (val < 0)
return -EINVAL;
switch (attr) {
case hwmon_fan_min:
if (!val) /* no unlimited minimum speed */
return -EINVAL;
reg = AMC6821_REG_TACH_LLIMITL;
break;
case hwmon_fan_max:
reg = AMC6821_REG_TACH_HLIMITL;
break;
case hwmon_fan_target:
if (!val) /* no unlimited target speed */
return -EINVAL;
reg = AMC6821_REG_TACH_SETTINGL;
break;
default:
return -EOPNOTSUPP;
}
val = val ? 6000000 / clamp_val(val, 1, 6000000) : 0;
val = clamp_val(val, 0, 0xffff);
regs[0] = val & 0xff;
regs[1] = val >> 8;
return regmap_bulk_write(data->regmap, reg, regs, 2);
}
static ssize_t temp_auto_point_temp_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct amc6821_data *data = dev_get_drvdata(dev);
int ix = to_sensor_dev_attr_2(devattr)->index;
int nr = to_sensor_dev_attr_2(devattr)->nr;
u8 temps[3];
int err;
mutex_lock(&data->update_lock);
err = amc6821_get_auto_point_temps(data->regmap, nr, temps);
mutex_unlock(&data->update_lock);
if (err)
return err;
return sysfs_emit(buf, "%d\n", temps[ix] * 1000);
}
static ssize_t pwm1_auto_point_pwm_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct amc6821_data *data = dev_get_drvdata(dev);
int ix = to_sensor_dev_attr(devattr)->index;
u32 val;
int err;
switch (ix) {
case 0:
val = 0;
break;
case 1:
err = regmap_read(data->regmap, AMC6821_REG_DCY_LOW_TEMP, &val);
if (err)
return err;
break;
default:
val = 255;
break;
}
return sysfs_emit(buf, "%d\n", val);
}
/*
* Set TEMP[0-4] (low temperature) and SLP[0-2] (slope) of local or remote
* TEMP-FAN control register.
*
* Return 0 on success or negative error code.
*
* Channel 0: local, channel 1: remote
*/
static inline int set_slope_register(struct regmap *regmap, int channel, u8 *temps)
{
u8 regval = FIELD_PREP(AMC6821_TEMP_LIMIT_MASK, temps[1] / 4);
u8 tmp, dpwm;
int err, dt;
u32 pwm;
err = regmap_read(regmap, AMC6821_REG_DCY_LOW_TEMP, &pwm);
if (err)
return err;
dpwm = 255 - pwm;
dt = temps[2] - temps[1];
for (tmp = 4; tmp > 0; tmp--) {
if (dt * (32 >> tmp) >= dpwm)
break;
}
regval |= FIELD_PREP(AMC6821_TEMP_SLOPE_MASK, tmp);
return regmap_write(regmap,
channel ? AMC6821_REG_RTEMP_FAN_CTRL : AMC6821_REG_LTEMP_FAN_CTRL,
regval);
}
static ssize_t temp_auto_point_temp_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct amc6821_data *data = dev_get_drvdata(dev);
int ix = to_sensor_dev_attr_2(attr)->index;
int nr = to_sensor_dev_attr_2(attr)->nr;
struct regmap *regmap = data->regmap;
u8 temps[3], otemps[3];
long val;
int ret;
ret = kstrtol(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&data->update_lock);
ret = amc6821_get_auto_point_temps(data->regmap, nr, temps);
if (ret)
goto unlock;
switch (ix) {
case 0:
/*
* Passive cooling temperature. Range limit against low limit
* of both channels.
*/
ret = amc6821_get_auto_point_temps(data->regmap, 1 - nr, otemps);
if (ret)
goto unlock;
val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 63000), 1000);
val = clamp_val(val, 0, min(temps[1], otemps[1]));
ret = regmap_write(regmap, AMC6821_REG_PSV_TEMP, val);
break;
case 1:
/*
* Low limit; must be between passive and high limit,
* and not exceed 124. Step size is 4 degrees C.
*/
val = clamp_val(val, DIV_ROUND_UP(temps[0], 4) * 4000, 124000);
temps[1] = DIV_ROUND_CLOSEST(val, 4000) * 4;
val = temps[1] / 4;
/* Auto-adjust high limit if necessary */
temps[2] = clamp_val(temps[2], temps[1] + 1, 255);
ret = set_slope_register(regmap, nr, temps);
break;
case 2:
/* high limit, must be higher than low limit */
val = clamp_val(val, (temps[1] + 1) * 1000, 255000);
temps[2] = DIV_ROUND_CLOSEST(val, 1000);
ret = set_slope_register(regmap, nr, temps);
break;
default:
ret = -EINVAL;
break;
}
unlock:
mutex_unlock(&data->update_lock);
return ret ? : count;
}
static ssize_t pwm1_auto_point_pwm_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct regmap *regmap = data->regmap;
int i, ret;
u8 val;
ret = kstrtou8(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&data->update_lock);
ret = regmap_write(regmap, AMC6821_REG_DCY_LOW_TEMP, val);
if (ret)
goto unlock;
for (i = 0; i < 2; i++) {
u8 temps[3];
ret = amc6821_get_auto_point_temps(regmap, i, temps);
if (ret)
break;
ret = set_slope_register(regmap, i, temps);
if (ret)
break;
}
unlock:
mutex_unlock(&data->update_lock);
return ret ? : count;
}
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm1_auto_point_pwm, 0);
static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm1_auto_point_pwm, 1);
static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm1_auto_point_pwm, 2);
static SENSOR_DEVICE_ATTR_2_RO(temp1_auto_point1_temp, temp_auto_point_temp,
0, 0);
static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point2_temp, temp_auto_point_temp,
0, 1);
static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point3_temp, temp_auto_point_temp,
0, 2);
static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point1_temp, temp_auto_point_temp,
1, 0);
static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point2_temp, temp_auto_point_temp,
1, 1);
static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point3_temp, temp_auto_point_temp,
1, 2);
static struct attribute *amc6821_attrs[] = {
&sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
&sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
&sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
&sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
&sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
&sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
&sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(amc6821);
static int amc6821_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
switch (type) {
case hwmon_temp:
return amc6821_temp_read(dev, attr, channel, val);
case hwmon_fan:
return amc6821_fan_read(dev, attr, val);
case hwmon_pwm:
return amc6821_pwm_read(dev, attr, val);
default:
return -EOPNOTSUPP;
}
}
static int amc6821_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
switch (type) {
case hwmon_temp:
return amc6821_temp_write(dev, attr, channel, val);
case hwmon_fan:
return amc6821_fan_write(dev, attr, val);
case hwmon_pwm:
return amc6821_pwm_write(dev, attr, val);
default:
return -EOPNOTSUPP;
}
}
static umode_t amc6821_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_min_alarm:
case hwmon_temp_max_alarm:
case hwmon_temp_crit_alarm:
case hwmon_temp_fault:
return 0444;
case hwmon_temp_min:
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_pulses:
case hwmon_fan_min:
case hwmon_fan_max:
case hwmon_fan_target:
return 0644;
default:
return 0;
}
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_mode:
case hwmon_pwm_enable:
case hwmon_pwm_input:
return 0644;
case hwmon_pwm_auto_channels_temp:
return 0444;
default:
return 0;
}
default:
return 0;
}
}
static const struct hwmon_channel_info * const amc6821_info[] = {
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM,
HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
HWMON_T_FAULT),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX |
HWMON_F_TARGET | HWMON_F_PULSES | HWMON_F_FAULT),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE | HWMON_PWM_MODE |
HWMON_PWM_AUTO_CHANNELS_TEMP),
NULL
};
static const struct hwmon_ops amc6821_hwmon_ops = {
.is_visible = amc6821_is_visible,
.read = amc6821_read,
.write = amc6821_write,
};
static const struct hwmon_chip_info amc6821_chip_info = {
.ops = &amc6821_hwmon_ops,
.info = amc6821_info,
};
static int amc6821_set_sw_dcy(struct amc6821_data *data, u8 duty_cycle)
{
int ret;
ret = regmap_write(data->regmap, AMC6821_REG_DCY, duty_cycle);
if (ret)
return ret;
return regmap_update_bits(data->regmap, AMC6821_REG_CONF1,
AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1, 0);
}
static int amc6821_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state)
{
struct amc6821_data *data = cdev->devdata;
if (!data)
return -EINVAL;
*state = data->fan_max_state;
return 0;
}
static int amc6821_get_cur_state(struct thermal_cooling_device *cdev, unsigned long *state)
{
struct amc6821_data *data = cdev->devdata;
if (!data)
return -EINVAL;
*state = data->fan_state;
return 0;
}
static int amc6821_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
{
struct amc6821_data *data = cdev->devdata;
int ret;
if (!data || state > data->fan_max_state)
return -EINVAL;
ret = amc6821_set_sw_dcy(data, data->fan_cooling_levels[state]);
if (ret)
return ret;
data->fan_state = state;
return 0;
}
static const struct thermal_cooling_device_ops amc6821_cooling_ops = {
.get_max_state = amc6821_get_max_state,
.get_cur_state = amc6821_get_cur_state,
.set_cur_state = amc6821_set_cur_state,
};
/* Return 0 if detection is successful, -ENODEV otherwise */
static int amc6821_detect(struct i2c_client *client, struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
int address = client->addr;
int dev_id, comp_id;
dev_dbg(&adapter->dev, "amc6821_detect called.\n");
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_dbg(&adapter->dev,
"amc6821: I2C bus doesn't support byte mode, "
"skipping.\n");
return -ENODEV;
}
dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
if (dev_id != 0x21 || comp_id != 0x49) {
dev_dbg(&adapter->dev,
"amc6821: detection failed at 0x%02x.\n",
address);
return -ENODEV;
}
/*
* Bit 7 of the address register is ignored, so we can check the
* ID registers again
*/
dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
if (dev_id != 0x21 || comp_id != 0x49) {
dev_dbg(&adapter->dev,
"amc6821: detection failed at 0x%02x.\n",
address);
return -ENODEV;
}
dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
strscpy(info->type, "amc6821", I2C_NAME_SIZE);
return 0;
}
static enum pwm_polarity amc6821_pwm_polarity(struct i2c_client *client,
struct device_node *fan_np)
{
enum pwm_polarity polarity = PWM_POLARITY_NORMAL;
struct of_phandle_args args;
/*
* For backward compatibility, the pwminv module parameter takes
* always the precedence over any other device description
*/
if (pwminv == 0)
return PWM_POLARITY_NORMAL;
if (pwminv > 0)
return PWM_POLARITY_INVERSED;
if (of_parse_phandle_with_args(fan_np, "pwms", "#pwm-cells", 0, &args))
goto out;
of_node_put(args.np);
if (args.args_count != 2)
goto out;
if (args.args[1] & PWM_POLARITY_INVERTED)
polarity = PWM_POLARITY_INVERSED;
out:
return polarity;
}
static int amc6821_of_fan_read_data(struct i2c_client *client,
struct amc6821_data *data,
struct device_node *fan_np)
{
int num;
data->pwm_polarity = amc6821_pwm_polarity(client, fan_np);
num = of_property_count_u32_elems(fan_np, "cooling-levels");
if (num <= 0)
return 0;
data->fan_max_state = num - 1;
data->fan_cooling_levels = devm_kcalloc(&client->dev, num,
sizeof(u32),
GFP_KERNEL);
if (!data->fan_cooling_levels)
return -ENOMEM;
return of_property_read_u32_array(fan_np, "cooling-levels",
data->fan_cooling_levels, num);
}
static int amc6821_init_client(struct i2c_client *client, struct amc6821_data *data)
{
struct regmap *regmap = data->regmap;
u32 regval;
int err;
if (init) {
err = regmap_set_bits(regmap, AMC6821_REG_CONF4, AMC6821_CONF4_MODE);
if (err)
return err;
err = regmap_clear_bits(regmap, AMC6821_REG_CONF3, AMC6821_CONF3_THERM_FAN_EN);
if (err)
return err;
err = regmap_clear_bits(regmap, AMC6821_REG_CONF2,
AMC6821_CONF2_RTFIE |
AMC6821_CONF2_LTOIE |
AMC6821_CONF2_RTOIE);
if (err)
return err;
regval = AMC6821_CONF1_START;
if (data->pwm_polarity == PWM_POLARITY_INVERSED)
regval |= AMC6821_CONF1_PWMINV;
err = regmap_update_bits(regmap, AMC6821_REG_CONF1,
AMC6821_CONF1_THERMOVIE | AMC6821_CONF1_FANIE |
AMC6821_CONF1_START | AMC6821_CONF1_PWMINV,
regval);
if (err)
return err;
/* Software DCY-control mode with fan enabled when cooling-levels present */
if (data->fan_cooling_levels) {
err = amc6821_set_sw_dcy(data,
data->fan_cooling_levels[data->fan_max_state]);
if (err)
return err;
}
}
return 0;
}
static bool amc6821_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case AMC6821_REG_STAT1:
case AMC6821_REG_STAT2:
case AMC6821_REG_TEMP_LO:
case AMC6821_REG_TDATA_LOW:
case AMC6821_REG_LTEMP_HI:
case AMC6821_REG_RTEMP_HI:
case AMC6821_REG_TDATA_HI:
return true;
default:
return false;
}
}
static const struct regmap_config amc6821_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = amc6821_volatile_reg,
.cache_type = REGCACHE_MAPLE,
};
static int amc6821_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct amc6821_data *data;
struct device *hwmon_dev;
struct regmap *regmap;
struct device_node *fan_np __free(device_node) = NULL;
int err;
data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
regmap = devm_regmap_init_i2c(client, &amc6821_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"Failed to initialize regmap\n");
data->regmap = regmap;
fan_np = of_get_child_by_name(dev->of_node, "fan");
if (fan_np) {
err = amc6821_of_fan_read_data(client, data, fan_np);
if (err)
return dev_err_probe(dev, err,
"Failed to read fan device tree data\n");
}
err = amc6821_init_client(client, data);
if (err)
return err;
if (of_device_is_compatible(dev->of_node, "tsd,mule")) {
err = devm_of_platform_populate(dev);
if (err)
return dev_err_probe(dev, err,
"Failed to create sub-devices\n");
}
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
data, &amc6821_chip_info,
amc6821_groups);
if (IS_ERR(hwmon_dev))
return dev_err_probe(dev, PTR_ERR(hwmon_dev),
"Failed to initialize hwmon\n");
if (IS_ENABLED(CONFIG_THERMAL) && fan_np && data->fan_cooling_levels)
return PTR_ERR_OR_ZERO(devm_thermal_of_child_cooling_device_register(dev,
fan_np, client->name, data, &amc6821_cooling_ops));
return 0;
}
static const struct i2c_device_id amc6821_id[] = {
{ .name = "amc6821" },
{ }
};
MODULE_DEVICE_TABLE(i2c, amc6821_id);
static const struct of_device_id __maybe_unused amc6821_of_match[] = {
{
.compatible = "ti,amc6821",
},
{
.compatible = "tsd,mule",
},
{ }
};
MODULE_DEVICE_TABLE(of, amc6821_of_match);
static struct i2c_driver amc6821_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "amc6821",
.of_match_table = of_match_ptr(amc6821_of_match),
},
.probe = amc6821_probe,
.id_table = amc6821_id,
.detect = amc6821_detect,
.address_list = normal_i2c,
};
module_i2c_driver(amc6821_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
