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|
/* 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 */
int 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,
|