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linux-stable/drivers/hwmon/amc6821.c
Stephen Kitt 6748703856 hwmon: use simple i2c probe function 
Many hwmon drivers don't use the id information provided by the old
i2c probe function, and the remainder can easily be adapted to the new
form ("probe_new") by calling i2c_match_id explicitly.

This avoids scanning the identifier tables during probes.

Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:

* if the information in i2c_client is sufficient, that's used instead
  (client->name);
* anything else is handled by calling i2c_match_id() with the same
  level of error-handling (if any) as before.

A few drivers aren't included in this patch because they have a
different set of maintainers. They will be covered by other patches.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-09-23 09:42:39 -07:00

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// 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>
*/
#include <linux/kernel.h> /* Needed for KERN_INFO */
#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>
/*
* 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; /*Inverted PWM output. */
module_param(pwminv, int, 0444);
static int init = 1; /*Power-on initialization.*/
module_param(init, int, 0444);
enum chips { amc6821 };
#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_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_LLIMITH 0x11
#define AMC6821_REG_TACH_HLIMITL 0x12
#define AMC6821_REG_TACH_HLIMITH 0x13
#define AMC6821_CONF1_START 0x01
#define AMC6821_CONF1_FAN_INT_EN 0x02
#define AMC6821_CONF1_FANIE 0x04
#define AMC6821_CONF1_PWMINV 0x08
#define AMC6821_CONF1_FAN_FAULT_EN 0x10
#define AMC6821_CONF1_FDRC0 0x20
#define AMC6821_CONF1_FDRC1 0x40
#define AMC6821_CONF1_THERMOVIE 0x80
#define AMC6821_CONF2_PWM_EN 0x01
#define AMC6821_CONF2_TACH_MODE 0x02
#define AMC6821_CONF2_TACH_EN 0x04
#define AMC6821_CONF2_RTFIE 0x08
#define AMC6821_CONF2_LTOIE 0x10
#define AMC6821_CONF2_RTOIE 0x20
#define AMC6821_CONF2_PSVIE 0x40
#define AMC6821_CONF2_RST 0x80
#define AMC6821_CONF3_THERM_FAN_EN 0x80
#define AMC6821_CONF3_REV_MASK 0x0F
#define AMC6821_CONF4_OVREN 0x10
#define AMC6821_CONF4_TACH_FAST 0x20
#define AMC6821_CONF4_PSPR 0x40
#define AMC6821_CONF4_MODE 0x80
#define AMC6821_STAT1_RPM_ALARM 0x01
#define AMC6821_STAT1_FANS 0x02
#define AMC6821_STAT1_RTH 0x04
#define AMC6821_STAT1_RTL 0x08
#define AMC6821_STAT1_R_THERM 0x10
#define AMC6821_STAT1_RTF 0x20
#define AMC6821_STAT1_LTH 0x40
#define AMC6821_STAT1_LTL 0x80
#define AMC6821_STAT2_RTC 0x08
#define AMC6821_STAT2_LTC 0x10
#define AMC6821_STAT2_LPSV 0x20
#define AMC6821_STAT2_L_THERM 0x40
#define AMC6821_STAT2_THERM_IN 0x80
enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX,
IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN,
IDX_TEMP2_MAX, IDX_TEMP2_CRIT,
TEMP_IDX_LEN, };
static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI,
AMC6821_REG_LTEMP_LIMIT_MIN,
AMC6821_REG_LTEMP_LIMIT_MAX,
AMC6821_REG_LTEMP_CRIT,
AMC6821_REG_RTEMP_HI,
AMC6821_REG_RTEMP_LIMIT_MIN,
AMC6821_REG_RTEMP_LIMIT_MAX,
AMC6821_REG_RTEMP_CRIT, };
enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
FAN1_IDX_LEN, };
static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
AMC6821_REG_TACH_LLIMITL,
AMC6821_REG_TACH_HLIMITL, };
static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
AMC6821_REG_TACH_LLIMITH,
AMC6821_REG_TACH_HLIMITH, };
/*
* Client data (each client gets its own)
*/
struct amc6821_data {
struct i2c_client *client;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* register values */
int temp[TEMP_IDX_LEN];
u16 fan[FAN1_IDX_LEN];
u8 fan1_div;
u8 pwm1;
u8 temp1_auto_point_temp[3];
u8 temp2_auto_point_temp[3];
u8 pwm1_auto_point_pwm[3];
u8 pwm1_enable;
u8 pwm1_auto_channels_temp;
u8 stat1;
u8 stat2;
};
static struct amc6821_data *amc6821_update_device(struct device *dev)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int timeout = HZ;
u8 reg;
int i;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + timeout) ||
!data->valid) {
for (i = 0; i < TEMP_IDX_LEN; i++)
data->temp[i] = (int8_t)i2c_smbus_read_byte_data(
client, temp_reg[i]);
data->stat1 = i2c_smbus_read_byte_data(client,
AMC6821_REG_STAT1);
data->stat2 = i2c_smbus_read_byte_data(client,
AMC6821_REG_STAT2);
data->pwm1 = i2c_smbus_read_byte_data(client,
AMC6821_REG_DCY);
for (i = 0; i < FAN1_IDX_LEN; i++) {
data->fan[i] = i2c_smbus_read_byte_data(
client,
fan_reg_low[i]);
data->fan[i] += i2c_smbus_read_byte_data(
client,
fan_reg_hi[i]) << 8;
}
data->fan1_div = i2c_smbus_read_byte_data(client,
AMC6821_REG_CONF4);
data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
data->pwm1_auto_point_pwm[0] = 0;
data->pwm1_auto_point_pwm[2] = 255;
data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
AMC6821_REG_DCY_LOW_TEMP);
data->temp1_auto_point_temp[0] =
i2c_smbus_read_byte_data(client,
AMC6821_REG_PSV_TEMP);
data->temp2_auto_point_temp[0] =
data->temp1_auto_point_temp[0];
reg = i2c_smbus_read_byte_data(client,
AMC6821_REG_LTEMP_FAN_CTRL);
data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
reg &= 0x07;
reg = 0x20 >> reg;
if (reg > 0)
data->temp1_auto_point_temp[2] =
data->temp1_auto_point_temp[1] +
(data->pwm1_auto_point_pwm[2] -
data->pwm1_auto_point_pwm[1]) / reg;
else
data->temp1_auto_point_temp[2] = 255;
reg = i2c_smbus_read_byte_data(client,
AMC6821_REG_RTEMP_FAN_CTRL);
data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
reg &= 0x07;
reg = 0x20 >> reg;
if (reg > 0)
data->temp2_auto_point_temp[2] =
data->temp2_auto_point_temp[1] +
(data->pwm1_auto_point_pwm[2] -
data->pwm1_auto_point_pwm[1]) / reg;
else
data->temp2_auto_point_temp[2] = 255;
reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
reg = (reg >> 5) & 0x3;
switch (reg) {
case 0: /*open loop: software sets pwm1*/
data->pwm1_auto_channels_temp = 0;
data->pwm1_enable = 1;
break;
case 2: /*closed loop: remote T (temp2)*/
data->pwm1_auto_channels_temp = 2;
data->pwm1_enable = 2;
break;
case 3: /*closed loop: local and remote T (temp2)*/
data->pwm1_auto_channels_temp = 3;
data->pwm1_enable = 3;
break;
case 1: /*
* semi-open loop: software sets rpm, chip controls
* pwm1, currently not implemented
*/
data->pwm1_auto_channels_temp = 0;
data->pwm1_enable = 0;
break;
}
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct amc6821_data *data = amc6821_update_device(dev);
int ix = to_sensor_dev_attr(devattr)->index;
return sprintf(buf, "%d\n", data->temp[ix] * 1000);
}
static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int ix = to_sensor_dev_attr(attr)->index;
long val;
int ret = kstrtol(buf, 10, &val);
if (ret)
return ret;
val = clamp_val(val / 1000, -128, 127);
mutex_lock(&data->update_lock);
data->temp[ix] = val;
if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
dev_err(&client->dev, "Register write error, aborting.\n");
count = -EIO;
}
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t temp_alarm_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct amc6821_data *data = amc6821_update_device(dev);
int ix = to_sensor_dev_attr(devattr)->index;
u8 flag;
switch (ix) {
case IDX_TEMP1_MIN:
flag = data->stat1 & AMC6821_STAT1_LTL;
break;
case IDX_TEMP1_MAX:
flag = data->stat1 & AMC6821_STAT1_LTH;
break;
case IDX_TEMP1_CRIT:
flag = data->stat2 & AMC6821_STAT2_LTC;
break;
case IDX_TEMP2_MIN:
flag = data->stat1 & AMC6821_STAT1_RTL;
break;
case IDX_TEMP2_MAX:
flag = data->stat1 & AMC6821_STAT1_RTH;
break;
case IDX_TEMP2_CRIT:
flag = data->stat2 & AMC6821_STAT2_RTC;
break;
default:
dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
return -EINVAL;
}
if (flag)
return sprintf(buf, "1");
else
return sprintf(buf, "0");
}
static ssize_t temp2_fault_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct amc6821_data *data = amc6821_update_device(dev);
if (data->stat1 & AMC6821_STAT1_RTF)
return sprintf(buf, "1");
else
return sprintf(buf, "0");
}
static ssize_t pwm1_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct amc6821_data *data = amc6821_update_device(dev);
return sprintf(buf, "%d\n", data->pwm1);
}
static ssize_t pwm1_store(struct device *dev,
struct device_attribute *devattr, const char *buf,
size_t count)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
long val;
int ret = kstrtol(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&data->update_lock);
data->pwm1 = clamp_val(val , 0, 255);
i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t pwm1_enable_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct amc6821_data *data = amc6821_update_device(dev);
return sprintf(buf, "%d\n", data->pwm1_enable);
}
static ssize_t pwm1_enable_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
long val;
int config = kstrtol(buf, 10, &val);
if (config)
return config;
mutex_lock(&data->update_lock);
config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
if (config < 0) {
dev_err(&client->dev,
"Error reading configuration register, aborting.\n");
count = config;
goto unlock;
}
switch (val) {
case 1:
config &= ~AMC6821_CONF1_FDRC0;
config &= ~AMC6821_CONF1_FDRC1;
break;
case 2:
config &= ~AMC6821_CONF1_FDRC0;
config |= AMC6821_CONF1_FDRC1;
break;
case 3:
config |= AMC6821_CONF1_FDRC0;
config |= AMC6821_CONF1_FDRC1;
break;
default:
count = -EINVAL;
goto unlock;
}
if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
dev_err(&client->dev,
"Configuration register write error, aborting.\n");
count = -EIO;
}
unlock:
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t pwm1_auto_channels_temp_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct amc6821_data *data = amc6821_update_device(dev);
return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
}
static ssize_t temp_auto_point_temp_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
int ix = to_sensor_dev_attr_2(devattr)->index;
int nr = to_sensor_dev_attr_2(devattr)->nr;
struct amc6821_data *data = amc6821_update_device(dev);
switch (nr) {
case 1:
return sprintf(buf, "%d\n",
data->temp1_auto_point_temp[ix] * 1000);
case 2:
return sprintf(buf, "%d\n",
data->temp2_auto_point_temp[ix] * 1000);
default:
dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
return -EINVAL;
}
}
static ssize_t pwm1_auto_point_pwm_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
int ix = to_sensor_dev_attr(devattr)->index;
struct amc6821_data *data = amc6821_update_device(dev);
return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
}
static inline ssize_t set_slope_register(struct i2c_client *client,
u8 reg,
u8 dpwm,
u8 *ptemp)
{
int dt;
u8 tmp;
dt = ptemp[2]-ptemp[1];
for (tmp = 4; tmp > 0; tmp--) {
if (dt * (0x20 >> tmp) >= dpwm)
break;
}
tmp |= (ptemp[1] & 0x7C) << 1;
if (i2c_smbus_write_byte_data(client,
reg, tmp)) {
dev_err(&client->dev, "Register write error, aborting.\n");
return -EIO;
}
return 0;
}
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 = amc6821_update_device(dev);
struct i2c_client *client = data->client;
int ix = to_sensor_dev_attr_2(attr)->index;
int nr = to_sensor_dev_attr_2(attr)->nr;
u8 *ptemp;
u8 reg;
int dpwm;
long val;
int ret = kstrtol(buf, 10, &val);
if (ret)
return ret;
switch (nr) {
case 1:
ptemp = data->temp1_auto_point_temp;
reg = AMC6821_REG_LTEMP_FAN_CTRL;
break;
case 2:
ptemp = data->temp2_auto_point_temp;
reg = AMC6821_REG_RTEMP_FAN_CTRL;
break;
default:
dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
return -EINVAL;
}
mutex_lock(&data->update_lock);
data->valid = 0;
switch (ix) {
case 0:
ptemp[0] = clamp_val(val / 1000, 0,
data->temp1_auto_point_temp[1]);
ptemp[0] = clamp_val(ptemp[0], 0,
data->temp2_auto_point_temp[1]);
ptemp[0] = clamp_val(ptemp[0], 0, 63);
if (i2c_smbus_write_byte_data(
client,
AMC6821_REG_PSV_TEMP,
ptemp[0])) {
dev_err(&client->dev,
"Register write error, aborting.\n");
count = -EIO;
}
goto EXIT;
case 1:
ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
ptemp[1] &= 0x7C;
ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
break;
case 2:
ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
break;
default:
dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
count = -EINVAL;
goto EXIT;
}
dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
if (set_slope_register(client, reg, dpwm, ptemp))
count = -EIO;
EXIT:
mutex_unlock(&data->update_lock);
return 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 i2c_client *client = data->client;
int dpwm;
long val;
int ret = kstrtol(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&data->update_lock);
data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
data->pwm1_auto_point_pwm[1])) {
dev_err(&client->dev, "Register write error, aborting.\n");
count = -EIO;
goto EXIT;
}
dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
data->temp1_auto_point_temp)) {
count = -EIO;
goto EXIT;
}
if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
data->temp2_auto_point_temp)) {
count = -EIO;
goto EXIT;
}
EXIT:
data->valid = 0;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct amc6821_data *data = amc6821_update_device(dev);
int ix = to_sensor_dev_attr(devattr)->index;
if (0 == data->fan[ix])
return sprintf(buf, "0");
return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
}
static ssize_t fan1_fault_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct amc6821_data *data = amc6821_update_device(dev);
if (data->stat1 & AMC6821_STAT1_FANS)
return sprintf(buf, "1");
else
return sprintf(buf, "0");
}
static ssize_t fan_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
long val;
int ix = to_sensor_dev_attr(attr)->index;
int ret = kstrtol(buf, 10, &val);
if (ret)
return ret;
val = 1 > val ? 0xFFFF : 6000000/val;
mutex_lock(&data->update_lock);
data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
data->fan[ix] & 0xFF)) {
dev_err(&client->dev, "Register write error, aborting.\n");
count = -EIO;
goto EXIT;
}
if (i2c_smbus_write_byte_data(client,
fan_reg_hi[ix], data->fan[ix] >> 8)) {
dev_err(&client->dev, "Register write error, aborting.\n");
count = -EIO;
}
EXIT:
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t fan1_div_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct amc6821_data *data = amc6821_update_device(dev);
return sprintf(buf, "%d\n", data->fan1_div);
}
static ssize_t fan1_div_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct amc6821_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
long val;
int config = kstrtol(buf, 10, &val);
if (config)
return config;
mutex_lock(&data->update_lock);
config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
if (config < 0) {
dev_err(&client->dev,
"Error reading configuration register, aborting.\n");
count = config;
goto EXIT;
}
switch (val) {
case 2:
config &= ~AMC6821_CONF4_PSPR;
data->fan1_div = 2;
break;
case 4:
config |= AMC6821_CONF4_PSPR;
data->fan1_div = 4;
break;
default:
count = -EINVAL;
goto EXIT;
}
if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
dev_err(&client->dev,
"Configuration register write error, aborting.\n");
count = -EIO;
}
EXIT:
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, IDX_TEMP1_INPUT);
static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, IDX_TEMP1_MIN);
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, IDX_TEMP1_MAX);
static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, IDX_TEMP1_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, temp_alarm, IDX_TEMP1_MIN);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, temp_alarm, IDX_TEMP1_MAX);
static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, temp_alarm, IDX_TEMP1_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, IDX_TEMP2_INPUT);
static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, IDX_TEMP2_MIN);
static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, IDX_TEMP2_MAX);
static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, IDX_TEMP2_CRIT);
static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp2_fault, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, temp_alarm, IDX_TEMP2_MIN);
static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, temp_alarm, IDX_TEMP2_MAX);
static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, temp_alarm, IDX_TEMP2_CRIT);
static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, IDX_FAN1_INPUT);
static SENSOR_DEVICE_ATTR_RW(fan1_min, fan, IDX_FAN1_MIN);
static SENSOR_DEVICE_ATTR_RW(fan1_max, fan, IDX_FAN1_MAX);
static SENSOR_DEVICE_ATTR_RO(fan1_fault, fan1_fault, 0);
static SENSOR_DEVICE_ATTR_RW(fan1_div, fan1_div, 0);
static SENSOR_DEVICE_ATTR_RW(pwm1, pwm1, 0);
static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm1_enable, 0);
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_RO(pwm1_auto_channels_temp, pwm1_auto_channels_temp,
0);
static SENSOR_DEVICE_ATTR_2_RO(temp1_auto_point1_temp, temp_auto_point_temp,
1, 0);
static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point2_temp, temp_auto_point_temp,
1, 1);
static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point3_temp, temp_auto_point_temp,
1, 2);
static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point1_temp, temp_auto_point_temp,
2, 0);
static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point2_temp, temp_auto_point_temp,
2, 1);
static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point3_temp, temp_auto_point_temp,
2, 2);
static struct attribute *amc6821_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_min.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_min.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan1_min.dev_attr.attr,
&sensor_dev_attr_fan1_max.dev_attr.attr,
&sensor_dev_attr_fan1_fault.dev_attr.attr,
&sensor_dev_attr_fan1_div.dev_attr.attr,
&sensor_dev_attr_pwm1.dev_attr.attr,
&sensor_dev_attr_pwm1_enable.dev_attr.attr,
&sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
&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);
/* 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);
strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
return 0;
}
static int amc6821_init_client(struct i2c_client *client)
{
int config;
int err = -EIO;
if (init) {
config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
if (config < 0) {
dev_err(&client->dev,
"Error reading configuration register, aborting.\n");
return err;
}
config |= AMC6821_CONF4_MODE;
if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
config)) {
dev_err(&client->dev,
"Configuration register write error, aborting.\n");
return err;
}
config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
if (config < 0) {
dev_err(&client->dev,
"Error reading configuration register, aborting.\n");
return err;
}
dev_info(&client->dev, "Revision %d\n", config & 0x0f);
config &= ~AMC6821_CONF3_THERM_FAN_EN;
if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
config)) {
dev_err(&client->dev,
"Configuration register write error, aborting.\n");
return err;
}
config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
if (config < 0) {
dev_err(&client->dev,
"Error reading configuration register, aborting.\n");
return err;
}
config &= ~AMC6821_CONF2_RTFIE;
config &= ~AMC6821_CONF2_LTOIE;
config &= ~AMC6821_CONF2_RTOIE;
if (i2c_smbus_write_byte_data(client,
AMC6821_REG_CONF2, config)) {
dev_err(&client->dev,
"Configuration register write error, aborting.\n");
return err;
}
config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
if (config < 0) {
dev_err(&client->dev,
"Error reading configuration register, aborting.\n");
return err;
}
config &= ~AMC6821_CONF1_THERMOVIE;
config &= ~AMC6821_CONF1_FANIE;
config |= AMC6821_CONF1_START;
if (pwminv)
config |= AMC6821_CONF1_PWMINV;
else
config &= ~AMC6821_CONF1_PWMINV;
if (i2c_smbus_write_byte_data(
client, AMC6821_REG_CONF1, config)) {
dev_err(&client->dev,
"Configuration register write error, aborting.\n");
return err;
}
}
return 0;
}
static int amc6821_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct amc6821_data *data;
struct device *hwmon_dev;
int err;
data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
mutex_init(&data->update_lock);
/*
* Initialize the amc6821 chip
*/
err = amc6821_init_client(client);
if (err)
return err;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data,
amc6821_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id amc6821_id[] = {
{ "amc6821", amc6821 },
{ }
};
MODULE_DEVICE_TABLE(i2c, amc6821_id);
static struct i2c_driver amc6821_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "amc6821",
},
.probe_new = 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");
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