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/*
* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* Copyright (C) 2003-2006 Jean Delvare <khali@linux-fr.org>
*
* Based on the lm83 driver. The LM90 is a sensor chip made by National
* Semiconductor. It reports up to two temperatures (its own plus up to
* one external one) with a 0.125 deg resolution (1 deg for local
* temperature) and a 3-4 deg accuracy. Complete datasheet can be
* obtained from National's website at:
* http://www.national.com/pf/LM/LM90.html
*
* This driver also supports the LM89 and LM99, two other sensor chips
* made by National Semiconductor. Both have an increased remote
* temperature measurement accuracy (1 degree), and the LM99
* additionally shifts remote temperatures (measured and limits) by 16
* degrees, which allows for higher temperatures measurement. The
* driver doesn't handle it since it can be done easily in user-space.
* Complete datasheets can be obtained from National's website at:
* http://www.national.com/pf/LM/LM89.html
* http://www.national.com/pf/LM/LM99.html
* Note that there is no way to differentiate between both chips.
*
* This driver also supports the LM86, another sensor chip made by
* National Semiconductor. It is exactly similar to the LM90 except it
* has a higher accuracy.
* Complete datasheet can be obtained from National's website at:
* http://www.national.com/pf/LM/LM86.html
*
* This driver also supports the ADM1032, a sensor chip made by Analog
* Devices. That chip is similar to the LM90, with a few differences
* that are not handled by this driver. Complete datasheet can be
* obtained from Analog's website at:
* http://www.analog.com/en/prod/0,2877,ADM1032,00.html
* Among others, it has a higher accuracy than the LM90, much like the
* LM86 does.
*
* This driver also supports the MAX6657, MAX6658 and MAX6659 sensor
* chips made by Maxim. These chips are similar to the LM86. Complete
* datasheet can be obtained at Maxim's website at:
* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
* Note that there is no easy way to differentiate between the three
* variants. The extra address and features of the MAX6659 are not
* supported by this driver. These chips lack the remote temperature
* offset feature.
*
* This driver also supports the MAX6680 and MAX6681, two other sensor
* chips made by Maxim. These are quite similar to the other Maxim
* chips. Complete datasheet can be obtained at:
* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3370
* The MAX6680 and MAX6681 only differ in the pinout so they can be
* treated identically.
*
* This driver also supports the ADT7461 chip from Analog Devices but
* only in its "compatability mode". If an ADT7461 chip is found but
* is configured in non-compatible mode (where its temperature
* register values are decoded differently) it is ignored by this
* driver. Complete datasheet can be obtained from Analog's website
* at:
* http://www.analog.com/en/prod/0,2877,ADT7461,00.html
*
* Since the LM90 was the first chipset supported by this driver, most
* comments will refer to this chipset, but are actually general and
* concern all supported chipsets, unless mentioned otherwise.
*
* 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.
*/
#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>
#include <linux/sysfs.h>
/*
* Addresses to scan
* Address is fully defined internally and cannot be changed except for
* MAX6659, MAX6680 and MAX6681.
* LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6657 and MAX6658
* have address 0x4c.
* ADM1032-2, ADT7461-2, LM89-1, and LM99-1 have address 0x4d.
* MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported).
* MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
* 0x4c, 0x4d or 0x4e.
*/
static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
0x29, 0x2a, 0x2b,
0x4c, 0x4d, 0x4e,
I2C_CLIENT_END };
/*
* Insmod parameters
*/
I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680);
/*
* The LM90 registers
*/
#define LM90_REG_R_MAN_ID 0xFE
#define LM90_REG_R_CHIP_ID 0xFF
#define LM90_REG_R_CONFIG1 0x03
#define LM90_REG_W_CONFIG1 0x09
#define LM90_REG_R_CONFIG2 0xBF
#define LM90_REG_W_CONFIG2 0xBF
#define LM90_REG_R_CONVRATE 0x04
#define LM90_REG_W_CONVRATE 0x0A
#define LM90_REG_R_STATUS 0x02
#define LM90_REG_R_LOCAL_TEMP 0x00
#define LM90_REG_R_LOCAL_HIGH 0x05
#define LM90_REG_W_LOCAL_HIGH 0x0B
#define LM90_REG_R_LOCAL_LOW 0x06
#define LM90_REG_W_LOCAL_LOW 0x0C
#define LM90_REG_R_LOCAL_CRIT 0x20
#define LM90_REG_W_LOCAL_CRIT 0x20
#define LM90_REG_R_REMOTE_TEMPH 0x01
#define LM90_REG_R_REMOTE_TEMPL 0x10
#define LM90_REG_R_REMOTE_OFFSH 0x11
#define LM90_REG_W_REMOTE_OFFSH 0x11
#define LM90_REG_R_REMOTE_OFFSL 0x12
#define LM90_REG_W_REMOTE_OFFSL 0x12
#define LM90_REG_R_REMOTE_HIGHH 0x07
#define LM90_REG_W_REMOTE_HIGHH 0x0D
#define LM90_REG_R_REMOTE_HIGHL 0x13
#define LM90_REG_W_REMOTE_HIGHL 0x13
#define LM90_REG_R_REMOTE_LOWH 0x08
#define LM90_REG_W_REMOTE_LOWH 0x0E
#define LM90_REG_R_REMOTE_LOWL 0x14
#define LM90_REG_W_REMOTE_LOWL 0x14
#define LM90_REG_R_REMOTE_CRIT 0x19
#define LM90_REG_W_REMOTE_CRIT 0x19
#define LM90_REG_R_TCRIT_HYST 0x21
#define LM90_REG_W_TCRIT_HYST 0x21
/*
* Conversions and various macros
* For local temperatures and limits, critical limits and the hysteresis
* value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
* For remote temperatures and limits, it uses signed 11-bit values with
* LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
*/
#define TEMP1_FROM_REG(val) ((val) * 1000)
#define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \
(val) >= 127000 ? 127 : \
(val) < 0 ? ((val) - 500) / 1000 : \
((val) + 500) / 1000)
#define TEMP2_FROM_REG(val) ((val) / 32 * 125)
#define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \
(val) >= 127875 ? 0x7FE0 : \
(val) < 0 ? ((val) - 62) / 125 * 32 : \
((val) + 62) / 125 * 32)
#define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \
((val) + 500) / 1000)
/*
* ADT7461 is almost identical to LM90 except that attempts to write
* values that are outside the range 0 < temp < 127 are treated as
* the boundary value.
*/
#define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
(val) >= 127000 ? 127 : \
((val) + 500) / 1000)
#define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
(val) >= 127750 ? 0x7FC0 : \
((val) + 125) / 250 * 64)
/*
* Functions declaration
*/
static int lm90_attach_adapter(struct i2c_adapter *adapter);
static int lm90_detect(struct i2c_adapter *adapter, int address,
int kind);
static void lm90_init_client(struct i2c_client *client);
static int lm90_detach_client(struct i2c_client *client);
static struct lm90_data *lm90_update_device(struct device *dev);
/*
* Driver data (common to all clients)
*/
static struct i2c_driver lm90_driver = {
.driver = {
.name = "lm90",
},
.id = I2C_DRIVERID_LM90,
.attach_adapter = lm90_attach_adapter,
.detach_client = lm90_detach_client,
};
/*
* Client data (each client gets its own)
*/
struct lm90_data {
struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
int kind;
/* registers values */
s8 temp8[5]; /* 0: local input
1: local low limit
2: local high limit
3: local critical limit
4: remote critical limit */
s16 temp11[4]; /* 0: remote input
1: remote low limit
2: remote high limit
3: remote offset (except max6657) */
u8 temp_hyst;
u8 alarms; /* bitvector */
};
/*
* Sysfs stuff
*/
static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm90_data *data = lm90_update_device(dev);
return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]));
}
static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
static const u8 reg[4] = {
LM90_REG_W_LOCAL_LOW,
LM90_REG_W_LOCAL_HIGH,
LM90_REG_W_LOCAL_CRIT,
LM90_REG_W_REMOTE_CRIT,
};
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct lm90_data *data = i2c_get_clientdata(client);
long val = simple_strtol(buf, NULL, 10);
int nr = attr->index;
mutex_lock(&data->update_lock);
if (data->kind == adt7461)
data->temp8[nr] = TEMP1_TO_REG_ADT7461(val);
else
data->temp8[nr] = TEMP1_TO_REG(val);
i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm90_data
|