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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lm83.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de>
*
* Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
* a sensor chip made by National Semiconductor. It reports up to four
* temperatures (its own plus up to three external ones) with a 1 deg
* resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
* from National's website at:
* http://www.national.com/pf/LM/LM83.html
* Since the datasheet omits to give the chip stepping code, I give it
* here: 0x03 (at register 0xff).
*
* Also supports the LM82 temp sensor, which is basically a stripped down
* model of the LM83. Datasheet is here:
* http://www.national.com/pf/LM/LM82.html
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
/*
* Addresses to scan
* Address is selected using 2 three-level pins, resulting in 9 possible
* addresses.
*/
static const unsigned short normal_i2c[] = {
0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
enum chips { lm83, lm82 };
/*
* The LM83 registers
* Manufacturer ID is 0x01 for National Semiconductor.
*/
#define LM83_REG_R_MAN_ID 0xFE
#define LM83_REG_R_CHIP_ID 0xFF
#define LM83_REG_R_CONFIG 0x03
#define LM83_REG_W_CONFIG 0x09
#define LM83_REG_R_STATUS1 0x02
#define LM83_REG_R_STATUS2 0x35
#define LM83_REG_R_LOCAL_TEMP 0x00
#define LM83_REG_R_LOCAL_HIGH 0x05
#define LM83_REG_W_LOCAL_HIGH 0x0B
#define LM83_REG_R_REMOTE1_TEMP 0x30
#define LM83_REG_R_REMOTE1_HIGH 0x38
#define LM83_REG_W_REMOTE1_HIGH 0x50
#define LM83_REG_R_REMOTE2_TEMP 0x01
#define LM83_REG_R_REMOTE2_HIGH 0x07
#define LM83_REG_W_REMOTE2_HIGH 0x0D
#define LM83_REG_R_REMOTE3_TEMP 0x31
#define LM83_REG_R_REMOTE3_HIGH 0x3A
#define LM83_REG_W_REMOTE3_HIGH 0x52
#define LM83_REG_R_TCRIT 0x42
#define LM83_REG_W_TCRIT 0x5A
static const u8 LM83_REG_TEMP[] = {
LM83_REG_R_LOCAL_TEMP,
LM83_REG_R_REMOTE1_TEMP,
LM83_REG_R_REMOTE2_TEMP,
LM83_REG_R_REMOTE3_TEMP,
LM83_REG_R_LOCAL_HIGH,
LM83_REG_R_REMOTE1_HIGH,
LM83_REG_R_REMOTE2_HIGH,
LM83_REG_R_REMOTE3_HIGH,
LM83_REG_R_TCRIT,
};
/*
* Client data (each client gets its own)
*/
struct lm83_data {
struct regmap *regmap;
const struct attribute_group *groups[3];
};
/* regmap code */
static int lm83_regmap_reg_read(void *context, unsigned int reg, unsigned int *val)
{
struct i2c_client *client = context;
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
return ret;
*val = ret;
return 0;
}
/*
* The regmap write function maps read register addresses to write register
* addresses. This is necessary for regmap register caching to work.
* An alternative would be to clear the regmap cache whenever a register is
* written, but that would be much more expensive.
*/
static int lm83_regmap_reg_write(void *context, unsigned int reg, unsigned int val)
{
struct i2c_client *client = context;
switch (reg) {
case LM83_REG_R_CONFIG:
case LM83_REG_R_LOCAL_HIGH:
case LM83_REG_R_REMOTE2_HIGH:
reg += 0x06;
break;
case LM83_REG_R_REMOTE1_HIGH:
case LM83_REG_R_REMOTE3_HIGH:
case LM83_REG_R_TCRIT:
reg += 0x18;
break;
default:
break;
}
return i2c_smbus_write_byte_data(client, reg, val);
}
static bool lm83_regmap_is_volatile(struct device *dev, unsigned int reg)
{
switch (reg) {
case LM83_REG_R_LOCAL_TEMP:
case LM83_REG_R_REMOTE1_TEMP:
case LM83_REG_R_REMOTE2_TEMP:
case LM83_REG_R_REMOTE3_TEMP:
case LM83_REG_R_STATUS1:
case LM83_REG_R_STATUS2:
return true;
default:
return false;
}
}
static const struct regmap_config lm83_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_RBTREE,
.volatile_reg = lm83_regmap_is_volatile,
.reg_read = lm83_regmap_reg_read,
.reg_write = lm83_regmap_reg_write,
};
/*
* Sysfs stuff
*/
static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm83_data *data = dev_get_drvdata(dev);
unsigned int regval;
int ret;
ret = regmap_read(data->regmap, LM83_REG_TEMP[attr->index], ®val);
if (ret)
return ret;
return sprintf(buf, "%d\n", (s8)regval * 1000);
}
static ssize_t temp_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 lm83_data *data = dev_get_drvdata(dev);
unsigned int regval;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err < 0)
return err;
regval = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
err = regmap_write(data->regmap, LM83_REG_TEMP[attr->index], regval);
return err ? : count;
}
static ssize_t alarms_show(struct device *dev, struct device_attribute *dummy,
char *buf)
{
struct lm83_data *data = dev_get_drvdata(dev);
unsigned int alarms, regval;
int err;
err = regmap_read(data->regmap, LM83_REG_R_STATUS1, ®val);
if (err < 0)
return err;
alarms = regval;
err = regmap_read(data->regmap, LM83_REG_R_STATUS2, ®val);
if (err < 0)
return err;
alarms |= regval << 8;
return sprintf(buf, "%u\n", alarms);
}
static ssize_t alarm_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm83_data *data = dev_get_drvdata(dev);
int bitnr = attr->index;
unsigned int alarm;
int reg, err;
if (bitnr < 8) {
reg = LM83_REG_R_STATUS1;
} else {
reg = LM83_REG_R_STATUS2;
bitnr -= 8;
}
err = regmap_read(data->regmap, reg, &alarm);
if (err < 0)
return err;
return sprintf(buf, "%d\n", (alarm >> bitnr) & 1);
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 4);
static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 5);
static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 6);
static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 7);
static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp, 8);
static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp, 8);
static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 8);
static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp, 8);
/* Individual alarm files */
static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 0);
static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 4);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 9);
static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 10);
static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 12);
static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 13);
static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 15);
/* Raw alarm file for compatibility */
static DEVICE_ATTR_RO(alarms);
static struct attribute *lm83_attributes[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
&sensor_dev_attr_temp3_crit.dev_attr.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&dev_attr_alarms.attr,
NULL
};
static const struct attribute_group lm83_group = {
.attrs = lm83_attributes,
};
static struct attribute *lm83_attributes_opt[] = {
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp4_input.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp4_max.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
&sensor_dev_attr_temp4_crit.dev_attr.attr,
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp4_fault.dev_attr.attr,
&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group lm83_group_opt = {
.attrs = lm83_attributes_opt,
};
/*
* Real code
*/
/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm83_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
const char *name;
u8 man_id, chip_id;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/* Detection */
if ((i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1) & 0xA8) ||
(i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2) & 0x48) ||
(i2c_smbus_read_byte_data(client, LM83_REG_R_CONFIG) & 0x41)) {
dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",
client->addr);
return -ENODEV;
}
/* Identification */
man_id = i2c_smbus_read_byte_data(client, LM83_REG_R_MAN_ID);
if (man_id != 0x01) /* National Semiconductor */
return -ENODEV;
chip_id = i2c_smbus_read_byte_data(client, LM83_REG_R_CHIP_ID);
switch (chip_id) {
case 0x03:
name = "lm83";
break;
case 0x01:
name = "lm82";
break;
default:
/* identification failed */
dev_info(&adapter->dev,
"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
man_id, chip_id);
return -ENODEV;
}
strlcpy(info->type, name, I2C_NAME_SIZE);
return 0;
}
static const struct i2c_device_id lm83_id[] = {
{ "lm83", lm83 },
{ "lm82", lm82 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm83_id);
static int lm83_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct lm83_data *data;
data = devm_kzalloc(dev, sizeof(struct lm83_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->regmap = devm_regmap_init(dev, NULL, client, &lm83_regmap_config);
if (IS_ERR(data->regmap))
return PTR_ERR(data->regmap);
/*
* Register sysfs hooks
* The LM82 can only monitor one external diode which is
* at the same register as the LM83 temp3 entry - so we
* declare 1 and 3 common, and then 2 and 4 only for the LM83.
*/
data->groups[0] = &lm83_group;
if (i2c_match_id(lm83_id, client)->driver_data == lm83)
data->groups[1] = &lm83_group_opt;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, data->groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
/*
* Driver data (common to all clients)
*/
static struct i2c_driver lm83_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm83",
},
.probe_new = lm83_probe,
.id_table = lm83_id,
.detect = lm83_detect,
.address_list = normal_i2c,
};
module_i2c_driver(lm83_driver);
MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("LM83 driver");
MODULE_LICENSE("GPL");
|