Linux-2.6.33.2/drivers/hwmon/tmp401.c
/* tmp401.c
*
* Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
* Preliminary tmp411 support by:
* Gabriel Konat, Sander Leget, Wouter Willems
* Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
*
* Note this IC is in some aspect similar to the LM90, but it has quite a
* few differences too, for example the local temp has a higher resolution
* and thus has 16 bits registers for its value and limit instead of 8 bits.
*/
#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>
#include <linux/sysfs.h>
/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END };
enum chips { tmp401, tmp411 };
/*
* The TMP401 registers, note some registers have different addresses for
* reading and writing
*/
#define TMP401_STATUS 0x02
#define TMP401_CONFIG_READ 0x03
#define TMP401_CONFIG_WRITE 0x09
#define TMP401_CONVERSION_RATE_READ 0x04
#define TMP401_CONVERSION_RATE_WRITE 0x0A
#define TMP401_TEMP_CRIT_HYST 0x21
#define TMP401_CONSECUTIVE_ALERT 0x22
#define TMP401_MANUFACTURER_ID_REG 0xFE
#define TMP401_DEVICE_ID_REG 0xFF
#define TMP411_N_FACTOR_REG 0x18
static const u8 TMP401_TEMP_MSB[2] = { 0x00, 0x01 };
static const u8 TMP401_TEMP_LSB[2] = { 0x15, 0x10 };
static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2] = { 0x06, 0x08 };
static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2] = { 0x0C, 0x0E };
static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2] = { 0x17, 0x14 };
static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2] = { 0x05, 0x07 };
static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2] = { 0x0B, 0x0D };
static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2] = { 0x16, 0x13 };
/* These are called the THERM limit / hysteresis / mask in the datasheet */
static const u8 TMP401_TEMP_CRIT_LIMIT[2] = { 0x20, 0x19 };
static const u8 TMP411_TEMP_LOWEST_MSB[2] = { 0x30, 0x34 };
static const u8 TMP411_TEMP_LOWEST_LSB[2] = { 0x31, 0x35 };
static const u8 TMP411_TEMP_HIGHEST_MSB[2] = { 0x32, 0x36 };
static const u8 TMP411_TEMP_HIGHEST_LSB[2] = { 0x33, 0x37 };
/* Flags */
#define TMP401_CONFIG_RANGE 0x04
#define TMP401_CONFIG_SHUTDOWN 0x40
#define TMP401_STATUS_LOCAL_CRIT 0x01
#define TMP401_STATUS_REMOTE_CRIT 0x02
#define TMP401_STATUS_REMOTE_OPEN 0x04
#define TMP401_STATUS_REMOTE_LOW 0x08
#define TMP401_STATUS_REMOTE_HIGH 0x10
#define TMP401_STATUS_LOCAL_LOW 0x20
#define TMP401_STATUS_LOCAL_HIGH 0x40
/* Manufacturer / Device ID's */
#define TMP401_MANUFACTURER_ID 0x55
#define TMP401_DEVICE_ID 0x11
#define TMP411_DEVICE_ID 0x12
/*
* Functions declarations
*/
static int tmp401_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int tmp401_detect(struct i2c_client *client,
struct i2c_board_info *info);
static int tmp401_remove(struct i2c_client *client);
static struct tmp401_data *tmp401_update_device(struct device *dev);
/*
* Driver data (common to all clients)
*/
static const struct i2c_device_id tmp401_id[] = {
{ "tmp401", tmp401 },
{ "tmp411", tmp411 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tmp401_id);
static struct i2c_driver tmp401_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "tmp401",
},
.probe = tmp401_probe,
.remove = tmp401_remove,
.id_table = tmp401_id,
.detect = tmp401_detect,
.address_list = normal_i2c,
};
/*
* Client data (each client gets its own)
*/
struct tmp401_data {
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
enum chips kind;
/* register values */
u8 status;
u8 config;
u16 temp[2];
u16 temp_low[2];
u16 temp_high[2];
u8 temp_crit[2];
u8 temp_crit_hyst;
u16 temp_lowest[2];
u16 temp_highest[2];
};
/*
* Sysfs attr show / store functions
*/
static int tmp401_register_to_temp(u16 reg, u8 config)
{
int temp = reg;
if (config & TMP401_CONFIG_RANGE)
temp -= 64 * 256;
return (temp * 625 + 80) / 160;
}
static u16 tmp401_temp_to_register(long temp, u8 config)
{
if (config & TMP401_CONFIG_RANGE) {
temp = SENSORS_LIMIT(temp, -64000, 191000);
temp += 64000;
} else
temp = SENSORS_LIMIT(temp, 0, 127000);
return (temp * 160 + 312) / 625;
}
static int tmp401_crit_register_to_temp(u8 reg, u8 config)
{
int temp = reg;
if (config & TMP401_CONFIG_RANGE)
temp -= 64;
return temp * 1000;
}
static u8 tmp401_crit_temp_to_register(long temp, u8 config)
{
if (config & TMP401_CONFIG_RANGE) {
temp = SENSORS_LIMIT(temp, -64000, 191000);
temp += 64000;
} else
temp = SENSORS_LIMIT(temp, 0, 127000);
return (temp + 500) / 1000;
}
static ssize_t show_temp_value(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp[index], data->config));
}
static ssize_t show_temp_min(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp_low[index], data->config));
}
static ssize_t show_temp_max(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp_high[index], data->config));
}
static ssize_t show_temp_crit(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_crit_register_to_temp(data->temp_crit[index],
data->config));
}
static ssize_t show_temp_crit_hyst(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int temp, index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
mutex_lock(&data->update_lock);
temp = tmp401_crit_register_to_temp(data->temp_crit[index],
data->config);
temp -= data->temp_crit_hyst * 1000;
mutex_unlock(&data->update_lock);
return sprintf(buf, "%d\n", temp);
}
static ssize_t show_temp_lowest(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp_lowest[index],
data->config));
}
static ssize_t show_temp_highest(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
return sprintf(buf, "%d\n",
tmp401_register_to_temp(data->temp_highest[index],
data->config));
}
static ssize_t show_status(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int mask = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
if (data->status & mask)
return sprintf(buf, "1\n");
else
return sprintf(buf, "0\n");
}
static ssize_t store_temp_min(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
long val;
u16 reg;
if (strict_strtol(buf, 10, &val))
return -EINVAL;
reg = tmp401_temp_to_register(val, data->config);
mutex_lock(&data->update_lock);
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8);
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF);
data->temp_low[index] = reg;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t store_temp_max(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
long val;
u16 reg;
if (strict_strtol(buf, 10, &val))
return -EINVAL;
reg = tmp401_temp_to_register(val, data->config);
mutex_lock(&data->update_lock);
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8);
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF);
data->temp_high[index] = reg;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t store_temp_crit(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
{
int index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
long val;
u8 reg;
if (strict_strtol(buf, 10, &val))
return -EINVAL;
reg = tmp401_crit_temp_to_register(val, data->config);
mutex_lock(&data->update_lock);
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_CRIT_LIMIT[index], reg);
data->temp_crit[index] = reg;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
{
int temp, index = to_sensor_dev_attr(devattr)->index;
struct tmp401_data *data = tmp401_update_device(dev);
long val;
u8 reg;
if (strict_strtol(buf, 10, &val))
return -EINVAL;
if (data->config & TMP401_CONFIG_RANGE)
val = SENSORS_LIMIT(val, -64000, 191000);
else
val = SENSORS_LIMIT(val, 0, 127000);
mutex_lock(&data->update_lock);
temp = tmp401_crit_register_to_temp(data->temp_crit[index],
data->config);
val = SENSORS_LIMIT(val, temp - 255000, temp);
reg = ((temp - val) + 500) / 1000;
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP401_TEMP_CRIT_HYST, reg);
data->temp_crit_hyst = reg;
mutex_unlock(&data->update_lock);
return count;
}
/*
* Resets the historical measurements of minimum and maximum temperatures.
* This is done by writing any value to any of the minimum/maximum registers
* (0x30-0x37).
*/
static ssize_t reset_temp_history(struct device *dev,
struct device_attribute *devattr, const char *buf, size_t count)
{
long val;
if (strict_strtol(buf, 10, &val))
return -EINVAL;
if (val != 1) {
dev_err(dev, "temp_reset_history value %ld not"
" supported. Use 1 to reset the history!\n", val);
return -EINVAL;
}
i2c_smbus_write_byte_data(to_i2c_client(dev),
TMP411_TEMP_LOWEST_MSB[0], val);
return count;
}
static struct sensor_device_attribute tmp401_attr[] = {
SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0),
SENSOR_ATTR(temp1_min, 0644, show_temp_min, store_temp_min, 0),
SENSOR_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 0),
SENSOR_ATTR(temp1_crit, 0644, show_temp_crit, store_temp_crit, 0),
SENSOR_ATTR(temp1_crit_hyst, 0644, show_temp_crit_hyst,
store_temp_crit_hyst, 0),
SENSOR_ATTR(temp1_min_alarm, 0444, show_status, NULL,
TMP401_STATUS_LOCAL_LOW),
SENSOR_ATTR(temp1_max_alarm, 0444, show_status, NULL,
TMP401_STATUS_LOCAL_HIGH),
SENSOR_ATTR(temp1_crit_alarm, 0444, show_status, NULL,
TMP401_STATUS_LOCAL_CRIT),
SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1),
SENSOR_ATTR(temp2_min, 0644, show_temp_min, store_temp_min, 1),
SENSOR_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 1),
SENSOR_ATTR(temp2_crit, 0644, show_temp_crit, store_temp_crit, 1),
SENSOR_ATTR(temp2_crit_hyst, 0444, show_temp_crit_hyst, NULL, 1),
SENSOR_ATTR(temp2_fault, 0444, show_status, NULL,
TMP401_STATUS_REMOTE_OPEN),
SENSOR_ATTR(temp2_min_alarm, 0444, show_status, NULL,
TMP401_STATUS_REMOTE_LOW),
SENSOR_ATTR(temp2_max_alarm, 0444, show_status, NULL,
TMP401_STATUS_REMOTE_HIGH),
SENSOR_ATTR(temp2_crit_alarm, 0444, show_status, NULL,
TMP401_STATUS_REMOTE_CRIT),
};
/*
* Additional features of the TMP411 chip.
* The TMP411 stores the minimum and maximum
* temperature measured since power-on, chip-reset, or
* minimum and maximum register reset for both the local
* and remote channels.
*/
static struct sensor_device_attribute tmp411_attr[] = {
SENSOR_ATTR(temp1_highest, 0444, show_temp_highest, NULL, 0),
SENSOR_ATTR(temp1_lowest, 0444, show_temp_lowest, NULL, 0),
SENSOR_ATTR(temp2_highest, 0444, show_temp_highest, NULL, 1),
SENSOR_ATTR(temp2_lowest, 0444, show_temp_lowest, NULL, 1),
SENSOR_ATTR(temp_reset_history, 0200, NULL, reset_temp_history, 0),
};
/*
* Begin non sysfs callback code (aka Real code)
*/
static void tmp401_init_client(struct i2c_client *client)
{
int config, config_orig;
/* Set the conversion rate to 2 Hz */
i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
/* Start conversions (disable shutdown if necessary) */
config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
if (config < 0) {
dev_warn(&client->dev, "Initialization failed!\n");
return;
}
config_orig = config;
config &= ~TMP401_CONFIG_SHUTDOWN;
if (config != config_orig)
i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
}
static int tmp401_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
enum chips kind;
struct i2c_adapter *adapter = client->adapter;
u8 reg;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/* Detect and identify the chip */
reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
if (reg != TMP401_MANUFACTURER_ID)
return -ENODEV;
reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
switch (reg) {
case TMP401_DEVICE_ID:
kind = tmp401;
break;
case TMP411_DEVICE_ID:
kind = tmp411;
break;
default:
return -ENODEV;
}
reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
if (reg & 0x1b)
return -ENODEV;
reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
/* Datasheet says: 0x1-0x6 */
if (reg > 15)
return -ENODEV;
strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
return 0;
}
static int tmp401_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int i, err = 0;
struct tmp401_data *data;
const char *names[] = { "TMP401", "TMP411" };
data = kzalloc(sizeof(struct tmp401_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
data->kind = id->driver_data;
/* Initialize the TMP401 chip */
tmp401_init_client(client);
/* Register sysfs hooks */
for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) {
err = device_create_file(&client->dev,
&tmp401_attr[i].dev_attr);
if (err)
goto exit_remove;
}
/* Register aditional tmp411 sysfs hooks */
if (data->kind == tmp411) {
for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++) {
err = device_create_file(&client->dev,
&tmp411_attr[i].dev_attr);
if (err)
goto exit_remove;
}
}
data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
data->hwmon_dev = NULL;
goto exit_remove;
}
dev_info(&client->dev, "Detected TI %s chip\n", names[data->kind]);
return 0;
exit_remove:
tmp401_remove(client); /* will also free data for us */
return err;
}
static int tmp401_remove(struct i2c_client *client)
{
struct tmp401_data *data = i2c_get_clientdata(client);
int i;
if (data->hwmon_dev)
hwmon_device_unregister(data->hwmon_dev);
for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++)
device_remove_file(&client->dev, &tmp401_attr[i].dev_attr);
if (data->kind == tmp411) {
for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++)
device_remove_file(&client->dev,
&tmp411_attr[i].dev_attr);
}
kfree(data);
return 0;
}
static struct tmp401_data *tmp401_update_device_reg16(
struct i2c_client *client, struct tmp401_data *data)
{
int i;
for (i = 0; i < 2; i++) {
/*
* High byte must be read first immediately followed
* by the low byte
*/
data->temp[i] = i2c_smbus_read_byte_data(client,
TMP401_TEMP_MSB[i]) << 8;
data->temp[i] |= i2c_smbus_read_byte_data(client,
TMP401_TEMP_LSB[i]);
data->temp_low[i] = i2c_smbus_read_byte_data(client,
TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8;
data->temp_low[i] |= i2c_smbus_read_byte_data(client,
TMP401_TEMP_LOW_LIMIT_LSB[i]);
data->temp_high[i] = i2c_smbus_read_byte_data(client,
TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8;
data->temp_high[i] |= i2c_smbus_read_byte_data(client,
TMP401_TEMP_HIGH_LIMIT_LSB[i]);
data->temp_crit[i] = i2c_smbus_read_byte_data(client,
TMP401_TEMP_CRIT_LIMIT[i]);
if (data->kind == tmp411) {
data->temp_lowest[i] = i2c_smbus_read_byte_data(client,
TMP411_TEMP_LOWEST_MSB[i]) << 8;
data->temp_lowest[i] |= i2c_smbus_read_byte_data(
client, TMP411_TEMP_LOWEST_LSB[i]);
data->temp_highest[i] = i2c_smbus_read_byte_data(
client, TMP411_TEMP_HIGHEST_MSB[i]) << 8;
data->temp_highest[i] |= i2c_smbus_read_byte_data(
client, TMP411_TEMP_HIGHEST_LSB[i]);
}
}
return data;
}
static struct tmp401_data *tmp401_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct tmp401_data *data = i2c_get_clientdata(client);
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS);
data->config = i2c_smbus_read_byte_data(client,
TMP401_CONFIG_READ);
tmp401_update_device_reg16(client, data);
data->temp_crit_hyst = i2c_smbus_read_byte_data(client,
TMP401_TEMP_CRIT_HYST);
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
static int __init tmp401_init(void)
{
return i2c_add_driver(&tmp401_driver);
}
static void __exit tmp401_exit(void)
{
i2c_del_driver(&tmp401_driver);
}
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
MODULE_LICENSE("GPL");
module_init(tmp401_init);
module_exit(tmp401_exit);