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alistair23-linux/drivers/hwmon/adm1029.c
Guenter Roeck 23297edbc1 hwmon: Convert remaining drivers to use SPDX identifier 
This gets rid of the unnecessary license boilerplate, and avoids
having to deal with individual patches one by one.

No functional changes intended.

Reviewed-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2019-06-23 18:34:11 -07:00

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// SPDX-License-Identifier: GPL-2.0
/*
* adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
*
* Copyright (C) 2006 Corentin LABBE <clabbe.montjoie@gmail.com>
*
* Based on LM83 Driver by Jean Delvare <jdelvare@suse.de>
*
* Give only processor, motherboard temperatures and fan tachs
* Very rare chip please let me know if you use it
*
* http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.pdf
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/mutex.h>
/*
* Addresses to scan
*/
static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
0x2e, 0x2f, I2C_CLIENT_END
};
/*
* The ADM1029 registers
* Manufacturer ID is 0x41 for Analog Devices
*/
#define ADM1029_REG_MAN_ID 0x0D
#define ADM1029_REG_CHIP_ID 0x0E
#define ADM1029_REG_CONFIG 0x01
#define ADM1029_REG_NB_FAN_SUPPORT 0x02
#define ADM1029_REG_TEMP_DEVICES_INSTALLED 0x06
#define ADM1029_REG_LOCAL_TEMP 0xA0
#define ADM1029_REG_REMOTE1_TEMP 0xA1
#define ADM1029_REG_REMOTE2_TEMP 0xA2
#define ADM1029_REG_LOCAL_TEMP_HIGH 0x90
#define ADM1029_REG_REMOTE1_TEMP_HIGH 0x91
#define ADM1029_REG_REMOTE2_TEMP_HIGH 0x92
#define ADM1029_REG_LOCAL_TEMP_LOW 0x98
#define ADM1029_REG_REMOTE1_TEMP_LOW 0x99
#define ADM1029_REG_REMOTE2_TEMP_LOW 0x9A
#define ADM1029_REG_FAN1 0x70
#define ADM1029_REG_FAN2 0x71
#define ADM1029_REG_FAN1_MIN 0x78
#define ADM1029_REG_FAN2_MIN 0x79
#define ADM1029_REG_FAN1_CONFIG 0x68
#define ADM1029_REG_FAN2_CONFIG 0x69
#define TEMP_FROM_REG(val) ((val) * 1000)
#define DIV_FROM_REG(val) (1 << (((val) >> 6) - 1))
/* Registers to be checked by adm1029_update_device() */
static const u8 ADM1029_REG_TEMP[] = {
ADM1029_REG_LOCAL_TEMP,
ADM1029_REG_REMOTE1_TEMP,
ADM1029_REG_REMOTE2_TEMP,
ADM1029_REG_LOCAL_TEMP_HIGH,
ADM1029_REG_REMOTE1_TEMP_HIGH,
ADM1029_REG_REMOTE2_TEMP_HIGH,
ADM1029_REG_LOCAL_TEMP_LOW,
ADM1029_REG_REMOTE1_TEMP_LOW,
ADM1029_REG_REMOTE2_TEMP_LOW,
};
static const u8 ADM1029_REG_FAN[] = {
ADM1029_REG_FAN1,
ADM1029_REG_FAN2,
ADM1029_REG_FAN1_MIN,
ADM1029_REG_FAN2_MIN,
};
static const u8 ADM1029_REG_FAN_DIV[] = {
ADM1029_REG_FAN1_CONFIG,
ADM1029_REG_FAN2_CONFIG,
};
/*
* Client data (each client gets its own)
*/
struct adm1029_data {
struct i2c_client *client;
struct mutex update_lock; /* protect register access */
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* registers values, signed for temperature, unsigned for other stuff */
s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
};
/*
* function that update the status of the chips (temperature for example)
*/
static struct adm1029_data *adm1029_update_device(struct device *dev)
{
struct adm1029_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
mutex_lock(&data->update_lock);
/*
* Use the "cache" Luke, don't recheck values
* if there are already checked not a long time later
*/
if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
int nr;
dev_dbg(&client->dev, "Updating adm1029 data\n");
for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
data->temp[nr] =
i2c_smbus_read_byte_data(client,
ADM1029_REG_TEMP[nr]);
}
for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
data->fan[nr] =
i2c_smbus_read_byte_data(client,
ADM1029_REG_FAN[nr]);
}
for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
data->fan_div[nr] =
i2c_smbus_read_byte_data(client,
ADM1029_REG_FAN_DIV[nr]);
}
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
/*
* 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 adm1029_data *data = adm1029_update_device(dev);
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
}
static ssize_t
fan_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adm1029_data *data = adm1029_update_device(dev);
u16 val;
if (data->fan[attr->index] == 0 ||
(data->fan_div[attr->index] & 0xC0) == 0 ||
data->fan[attr->index] == 255) {
return sprintf(buf, "0\n");
}
val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
/ data->fan[attr->index];
return sprintf(buf, "%d\n", val);
}
static ssize_t
fan_div_show(struct device *dev, struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct adm1029_data *data = adm1029_update_device(dev);
if ((data->fan_div[attr->index] & 0xC0) == 0)
return sprintf(buf, "0\n");
return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
}
static ssize_t fan_div_store(struct device *dev,
struct device_attribute *devattr,
const char *buf, size_t count)
{
struct adm1029_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
u8 reg;
long val;
int ret = kstrtol(buf, 10, &val);
if (ret < 0)
return ret;
mutex_lock(&data->update_lock);
/*Read actual config */
reg = i2c_smbus_read_byte_data(client,
ADM1029_REG_FAN_DIV[attr->index]);
switch (val) {
case 1:
val = 1;
break;
case 2:
val = 2;
break;
case 4:
val = 3;
break;
default:
mutex_unlock(&data->update_lock);
dev_err(&client->dev,
"fan_div value %ld not supported. Choose one of 1, 2 or 4!\n",
val);
return -EINVAL;
}
/* Update the value */
reg = (reg & 0x3F) | (val << 6);
/* Update the cache */
data->fan_div[attr->index] = reg;
/* Write value */
i2c_smbus_write_byte_data(client,
ADM1029_REG_FAN_DIV[attr->index], reg);
mutex_unlock(&data->update_lock);
return count;
}
/* Access rights on sysfs. */
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(temp1_max, temp, 3);
static SENSOR_DEVICE_ATTR_RO(temp2_max, temp, 4);
static SENSOR_DEVICE_ATTR_RO(temp3_max, temp, 5);
static SENSOR_DEVICE_ATTR_RO(temp1_min, temp, 6);
static SENSOR_DEVICE_ATTR_RO(temp2_min, temp, 7);
static SENSOR_DEVICE_ATTR_RO(temp3_min, temp, 8);
static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
static SENSOR_DEVICE_ATTR_RO(fan1_min, fan, 2);
static SENSOR_DEVICE_ATTR_RO(fan2_min, fan, 3);
static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
static struct attribute *adm1029_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_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_min.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_min.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan2_input.dev_attr.attr,
&sensor_dev_attr_fan1_min.dev_attr.attr,
&sensor_dev_attr_fan2_min.dev_attr.attr,
&sensor_dev_attr_fan1_div.dev_attr.attr,
&sensor_dev_attr_fan2_div.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(adm1029);
/*
* Real code
*/
/* Return 0 if detection is successful, -ENODEV otherwise */
static int adm1029_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/*
* ADM1029 doesn't have CHIP ID, check just MAN ID
* For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
* ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
* documented
*/
man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
temp_devices_installed = i2c_smbus_read_byte_data(client,
ADM1029_REG_TEMP_DEVICES_INSTALLED);
nb_fan_support = i2c_smbus_read_byte_data(client,
ADM1029_REG_NB_FAN_SUPPORT);
/* 0x41 is Analog Devices */
if (man_id != 0x41 || (temp_devices_installed & 0xf9) != 0x01 ||
nb_fan_support != 0x03)
return -ENODEV;
if ((chip_id & 0xF0) != 0x00) {
/*
* There are no "official" CHIP ID, so actually
* we use Major/Minor revision for that
*/
pr_info("Unknown major revision %x, please let us know\n",
chip_id);
return -ENODEV;
}
strlcpy(info->type, "adm1029", I2C_NAME_SIZE);
return 0;
}
static int adm1029_init_client(struct i2c_client *client)
{
u8 config;
config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
if ((config & 0x10) == 0) {
i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
config | 0x10);
}
/* recheck config */
config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
if ((config & 0x10) == 0) {
dev_err(&client->dev, "Initialization failed!\n");
return 0;
}
return 1;
}
static int adm1029_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct adm1029_data *data;
struct device *hwmon_dev;
data = devm_kzalloc(dev, sizeof(struct adm1029_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
mutex_init(&data->update_lock);
/*
* Initialize the ADM1029 chip
* Check config register
*/
if (adm1029_init_client(client) == 0)
return -ENODEV;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data,
adm1029_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id adm1029_id[] = {
{ "adm1029", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adm1029_id);
static struct i2c_driver adm1029_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "adm1029",
},
.probe = adm1029_probe,
.id_table = adm1029_id,
.detect = adm1029_detect,
.address_list = normal_i2c,
};
module_i2c_driver(adm1029_driver);
MODULE_AUTHOR("Corentin LABBE <clabbe.montjoie@gmail.com>");
MODULE_DESCRIPTION("adm1029 driver");
MODULE_LICENSE("GPL v2");
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