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lm90.c
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lm90.c
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/*
* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* Copyright (C) 2003-2010 Jean Delvare <[email protected]>
*
* 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.
*
* 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.
* Note that there is no way to differentiate between both chips.
* When device is auto-detected, the driver will assume an LM99.
*
* 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.
*
* 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. 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.
* Note that there is no easy way to differentiate between the three
* variants. We use the device address to detect MAX6659, which will result
* in a detection as max6657 if it is on address 0x4c. The extra address
* and features of the MAX6659 are only supported if the chip is configured
* explicitly as max6659, or if its address is not 0x4c.
* These chips lack the remote temperature offset feature.
*
* This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and
* MAX6692 chips made by Maxim. These are again similar to the LM86,
* but they use unsigned temperature values and can report temperatures
* from 0 to 145 degrees.
*
* This driver also supports the MAX6680 and MAX6681, two other sensor
* chips made by Maxim. These are quite similar to the other Maxim
* chips. The MAX6680 and MAX6681 only differ in the pinout so they can
* be treated identically.
*
* This driver also supports the MAX6695 and MAX6696, two other sensor
* chips made by Maxim. These are also quite similar to other Maxim
* chips, but support three temperature sensors instead of two. MAX6695
* and MAX6696 only differ in the pinout so they can be treated identically.
*
* This driver also supports ADT7461 and ADT7461A from Analog Devices as well as
* NCT1008 from ON Semiconductor. The chips are supported in both compatibility
* and extended mode. They are mostly compatible with LM90 except for a data
* format difference for the temperature value registers.
*
* This driver also supports the SA56004 from Philips. This device is
* pin-compatible with the LM86, the ED/EDP parts are also address-compatible.
*
* This driver also supports the G781 from GMT. This device is compatible
* with the ADM1032.
*
* This driver also supports TMP451 from Texas Instruments. This device is
* supported in both compatibility and extended mode. It's mostly compatible
* with ADT7461 except for local temperature low byte register and max
* conversion rate.
*
* 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>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.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, ADT7461A, MAX6649,
* MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c.
* ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D
* have address 0x4d.
* MAX6647 has address 0x4e.
* MAX6659 can have address 0x4c, 0x4d or 0x4e.
* MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
* 0x4c, 0x4d or 0x4e.
* SA56004 can have address 0x48 through 0x4F.
*/
static const unsigned short normal_i2c[] = {
0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
max6646, w83l771, max6696, sa56004, g781, tmp451 };
/*
* 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
/* MAX6646/6647/6649/6657/6658/6659/6695/6696 registers */
#define MAX6657_REG_R_LOCAL_TEMPL 0x11
#define MAX6696_REG_R_STATUS2 0x12
#define MAX6659_REG_R_REMOTE_EMERG 0x16
#define MAX6659_REG_W_REMOTE_EMERG 0x16
#define MAX6659_REG_R_LOCAL_EMERG 0x17
#define MAX6659_REG_W_LOCAL_EMERG 0x17
/* SA56004 registers */
#define SA56004_REG_R_LOCAL_TEMPL 0x22
#define LM90_DEF_CONVRATE_RVAL 6 /* Def conversion rate register value */
#define LM90_MAX_CONVRATE_MS 16000 /* Maximum conversion rate in ms */
/* TMP451 registers */
#define TMP451_REG_R_LOCAL_TEMPL 0x15
/*
* Device flags
*/
#define LM90_FLAG_ADT7461_EXT (1 << 0) /* ADT7461 extended mode */
/* Device features */
#define LM90_HAVE_OFFSET (1 << 1) /* temperature offset register */
#define LM90_HAVE_REM_LIMIT_EXT (1 << 3) /* extended remote limit */
#define LM90_HAVE_EMERGENCY (1 << 4) /* 3rd upper (emergency) limit */
#define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */
#define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
#define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */
/* LM90 status */
#define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */
#define LM90_STATUS_RTHRM (1 << 1) /* remote THERM limit tripped */
#define LM90_STATUS_ROPEN (1 << 2) /* remote is an open circuit */
#define LM90_STATUS_RLOW (1 << 3) /* remote low temp limit tripped */
#define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */
#define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */
#define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */
#define MAX6696_STATUS2_R2THRM (1 << 1) /* remote2 THERM limit tripped */
#define MAX6696_STATUS2_R2OPEN (1 << 2) /* remote2 is an open circuit */
#define MAX6696_STATUS2_R2LOW (1 << 3) /* remote2 low temp limit tripped */
#define MAX6696_STATUS2_R2HIGH (1 << 4) /* remote2 high temp limit tripped */
#define MAX6696_STATUS2_ROT2 (1 << 5) /* remote emergency limit tripped */
#define MAX6696_STATUS2_R2OT2 (1 << 6) /* remote2 emergency limit tripped */
#define MAX6696_STATUS2_LOT2 (1 << 7) /* local emergency limit tripped */
/*
* Driver data (common to all clients)
*/
static const struct i2c_device_id lm90_id[] = {
{ "adm1032", adm1032 },
{ "adt7461", adt7461 },
{ "adt7461a", adt7461 },
{ "g781", g781 },
{ "lm90", lm90 },
{ "lm86", lm86 },
{ "lm89", lm86 },
{ "lm99", lm99 },
{ "max6646", max6646 },
{ "max6647", max6646 },
{ "max6649", max6646 },
{ "max6657", max6657 },
{ "max6658", max6657 },
{ "max6659", max6659 },
{ "max6680", max6680 },
{ "max6681", max6680 },
{ "max6695", max6696 },
{ "max6696", max6696 },
{ "nct1008", adt7461 },
{ "w83l771", w83l771 },
{ "sa56004", sa56004 },
{ "tmp451", tmp451 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm90_id);
/*
* chip type specific parameters
*/
struct lm90_params {
u32 flags; /* Capabilities */
u16 alert_alarms; /* Which alarm bits trigger ALERT# */
/* Upper 8 bits for max6695/96 */
u8 max_convrate; /* Maximum conversion rate register value */
u8 reg_local_ext; /* Extended local temp register (optional) */
};
static const struct lm90_params lm90_params[] = {
[adm1032] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
| LM90_HAVE_BROKEN_ALERT,
.alert_alarms = 0x7c,
.max_convrate = 10,
},
[adt7461] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
| LM90_HAVE_BROKEN_ALERT,
.alert_alarms = 0x7c,
.max_convrate = 10,
},
[g781] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
| LM90_HAVE_BROKEN_ALERT,
.alert_alarms = 0x7c,
.max_convrate = 8,
},
[lm86] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
.alert_alarms = 0x7b,
.max_convrate = 9,
},
[lm90] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
.alert_alarms = 0x7b,
.max_convrate = 9,
},
[lm99] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
.alert_alarms = 0x7b,
.max_convrate = 9,
},
[max6646] = {
.alert_alarms = 0x7c,
.max_convrate = 6,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6657] = {
.alert_alarms = 0x7c,
.max_convrate = 8,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6659] = {
.flags = LM90_HAVE_EMERGENCY,
.alert_alarms = 0x7c,
.max_convrate = 8,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6680] = {
.flags = LM90_HAVE_OFFSET,
.alert_alarms = 0x7c,
.max_convrate = 7,
},
[max6696] = {
.flags = LM90_HAVE_EMERGENCY
| LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3,
.alert_alarms = 0x1c7c,
.max_convrate = 6,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[w83l771] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
.alert_alarms = 0x7c,
.max_convrate = 8,
},
[sa56004] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
.alert_alarms = 0x7b,
.max_convrate = 9,
.reg_local_ext = SA56004_REG_R_LOCAL_TEMPL,
},
[tmp451] = {
.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
| LM90_HAVE_BROKEN_ALERT,
.alert_alarms = 0x7c,
.max_convrate = 9,
.reg_local_ext = TMP451_REG_R_LOCAL_TEMPL,
}
};
/*
* TEMP8 register index
*/
enum lm90_temp8_reg_index {
LOCAL_LOW = 0,
LOCAL_HIGH,
LOCAL_CRIT,
REMOTE_CRIT,
LOCAL_EMERG, /* max6659 and max6695/96 */
REMOTE_EMERG, /* max6659 and max6695/96 */
REMOTE2_CRIT, /* max6695/96 only */
REMOTE2_EMERG, /* max6695/96 only */
TEMP8_REG_NUM
};
/*
* TEMP11 register index
*/
enum lm90_temp11_reg_index {
REMOTE_TEMP = 0,
REMOTE_LOW,
REMOTE_HIGH,
REMOTE_OFFSET, /* except max6646, max6657/58/59, and max6695/96 */
LOCAL_TEMP,
REMOTE2_TEMP, /* max6695/96 only */
REMOTE2_LOW, /* max6695/96 only */
REMOTE2_HIGH, /* max6695/96 only */
TEMP11_REG_NUM
};
/*
* Client data (each client gets its own)
*/
struct lm90_data {
struct i2c_client *client;
struct device *hwmon_dev;
const struct attribute_group *groups[6];
struct mutex update_lock;
struct regulator *regulator;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
int kind;
u32 flags;
int update_interval; /* in milliseconds */
u8 config_orig; /* Original configuration register value */
u8 convrate_orig; /* Original conversion rate register value */
u16 alert_alarms; /* Which alarm bits trigger ALERT# */
/* Upper 8 bits for max6695/96 */
u8 max_convrate; /* Maximum conversion rate */
u8 reg_local_ext; /* local extension register offset */
/* registers values */
s8 temp8[TEMP8_REG_NUM];
s16 temp11[TEMP11_REG_NUM];
u8 temp_hyst;
u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
};
/*
* Support functions
*/
/*
* The ADM1032 supports PEC but not on write byte transactions, so we need
* to explicitly ask for a transaction without PEC.
*/
static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
{
return i2c_smbus_xfer(client->adapter, client->addr,
client->flags & ~I2C_CLIENT_PEC,
I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
}
/*
* It is assumed that client->update_lock is held (unless we are in
* detection or initialization steps). This matters when PEC is enabled,
* because we don't want the address pointer to change between the write
* byte and the read byte transactions.
*/
static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value)
{
int err;
if (client->flags & I2C_CLIENT_PEC) {
err = adm1032_write_byte(client, reg);
if (err >= 0)
err = i2c_smbus_read_byte(client);
} else
err = i2c_smbus_read_byte_data(client, reg);
if (err < 0) {
dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
reg, err);
return err;
}
*value = err;
return 0;
}
static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
{
int err;
u8 oldh, newh, l;
/*
* There is a trick here. We have to read two registers to have the
* sensor temperature, but we have to beware a conversion could occur
* between the readings. The datasheet says we should either use
* the one-shot conversion register, which we don't want to do
* (disables hardware monitoring) or monitor the busy bit, which is
* impossible (we can't read the values and monitor that bit at the
* exact same time). So the solution used here is to read the high
* byte once, then the low byte, then the high byte again. If the new
* high byte matches the old one, then we have a valid reading. Else
* we have to read the low byte again, and now we believe we have a
* correct reading.
*/
if ((err = lm90_read_reg(client, regh, &oldh))
|| (err = lm90_read_reg(client, regl, &l))
|| (err = lm90_read_reg(client, regh, &newh)))
return err;
if (oldh != newh) {
err = lm90_read_reg(client, regl, &l);
if (err)
return err;
}
*value = (newh << 8) | l;
return 0;
}
/*
* client->update_lock must be held when calling this function (unless we are
* in detection or initialization steps), and while a remote channel other
* than channel 0 is selected. Also, calling code must make sure to re-select
* external channel 0 before releasing the lock. This is necessary because
* various registers have different meanings as a result of selecting a
* non-default remote channel.
*/
static inline void lm90_select_remote_channel(struct i2c_client *client,
struct lm90_data *data,
int channel)
{
u8 config;
if (data->kind == max6696) {
lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
config &= ~0x08;
if (channel)
config |= 0x08;
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
config);
}
}
/*
* Set conversion rate.
* client->update_lock must be held when calling this function (unless we are
* in detection or initialization steps).
*/
static void lm90_set_convrate(struct i2c_client *client, struct lm90_data *data,
unsigned int interval)
{
int i;
unsigned int update_interval;
/* Shift calculations to avoid rounding errors */
interval <<= 6;
/* find the nearest update rate */
for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6;
i < data->max_convrate; i++, update_interval >>= 1)
if (interval >= update_interval * 3 / 4)
break;
i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, i);
data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
}
static struct lm90_data *lm90_update_device(struct device *dev)
{
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
unsigned long next_update;
mutex_lock(&data->update_lock);
next_update = data->last_updated +
msecs_to_jiffies(data->update_interval);
if (time_after(jiffies, next_update) || !data->valid) {
u8 h, l;
u8 alarms;
dev_dbg(&client->dev, "Updating lm90 data.\n");
lm90_read_reg(client, LM90_REG_R_LOCAL_LOW,
&data->temp8[LOCAL_LOW]);
lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH,
&data->temp8[LOCAL_HIGH]);
lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT,
&data->temp8[LOCAL_CRIT]);
lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
&data->temp8[REMOTE_CRIT]);
lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
if (data->reg_local_ext) {
lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
data->reg_local_ext,
&data->temp11[LOCAL_TEMP]);
} else {
if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
&h) == 0)
data->temp11[LOCAL_TEMP] = h << 8;
}
lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL,
&data->temp11[REMOTE_TEMP]);
if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
data->temp11[REMOTE_LOW] = h << 8;
if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
&& lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
&l) == 0)
data->temp11[REMOTE_LOW] |= l;
}
if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
data->temp11[REMOTE_HIGH] = h << 8;
if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
&& lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
&l) == 0)
data->temp11[REMOTE_HIGH] |= l;
}
if (data->flags & LM90_HAVE_OFFSET) {
if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
&h) == 0
&& lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
&l) == 0)
data->temp11[REMOTE_OFFSET] = (h << 8) | l;
}
if (data->flags & LM90_HAVE_EMERGENCY) {
lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG,
&data->temp8[LOCAL_EMERG]);
lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
&data->temp8[REMOTE_EMERG]);
}
lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
data->alarms = alarms; /* save as 16 bit value */
if (data->kind == max6696) {
lm90_select_remote_channel(client, data, 1);
lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
&data->temp8[REMOTE2_CRIT]);
lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
&data->temp8[REMOTE2_EMERG]);
lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL,
&data->temp11[REMOTE2_TEMP]);
if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h))
data->temp11[REMOTE2_LOW] = h << 8;
if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
data->temp11[REMOTE2_HIGH] = h << 8;
lm90_select_remote_channel(client, data, 0);
if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2,
&alarms))
data->alarms |= alarms << 8;
}
/*
* Re-enable ALERT# output if it was originally enabled and
* relevant alarms are all clear
*/
if ((data->config_orig & 0x80) == 0
&& (data->alarms & data->alert_alarms) == 0) {
u8 config;
lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
if (config & 0x80) {
dev_dbg(&client->dev, "Re-enabling ALERT#\n");
i2c_smbus_write_byte_data(client,
LM90_REG_W_CONFIG1,
config & ~0x80);
}
}
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
/*
* Conversions
* 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. Some
* Maxim chips use unsigned values.
*/
static inline int temp_from_s8(s8 val)
{
return val * 1000;
}
static inline int temp_from_u8(u8 val)
{
return val * 1000;
}
static inline int temp_from_s16(s16 val)
{
return val / 32 * 125;
}
static inline int temp_from_u16(u16 val)
{
return val / 32 * 125;
}
static s8 temp_to_s8(long val)
{
if (val <= -128000)
return -128;
if (val >= 127000)
return 127;
if (val < 0)
return (val - 500) / 1000;
return (val + 500) / 1000;
}
static u8 temp_to_u8(long val)
{
if (val <= 0)
return 0;
if (val >= 255000)
return 255;
return (val + 500) / 1000;
}
static s16 temp_to_s16(long val)
{
if (val <= -128000)
return 0x8000;
if (val >= 127875)
return 0x7FE0;
if (val < 0)
return (val - 62) / 125 * 32;
return (val + 62) / 125 * 32;
}
static u8 hyst_to_reg(long val)
{
if (val <= 0)
return 0;
if (val >= 30500)
return 31;
return (val + 500) / 1000;
}
/*
* ADT7461 in compatibility mode 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.
*
* ADT7461 in "extended mode" operation uses unsigned integers offset by
* 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC.
*/
static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val)
{
if (data->flags & LM90_FLAG_ADT7461_EXT)
return (val - 64) * 1000;
else
return temp_from_s8(val);
}
static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val)
{
if (data->flags & LM90_FLAG_ADT7461_EXT)
return (val - 0x4000) / 64 * 250;
else
return temp_from_s16(val);
}
static u8 temp_to_u8_adt7461(struct lm90_data *data, long val)
{
if (data->flags & LM90_FLAG_ADT7461_EXT) {
if (val <= -64000)
return 0;
if (val >= 191000)
return 0xFF;
return (val + 500 + 64000) / 1000;
} else {
if (val <= 0)
return 0;
if (val >= 127000)
return 127;
return (val + 500) / 1000;
}
}
static u16 temp_to_u16_adt7461(struct lm90_data *data, long val)
{
if (data->flags & LM90_FLAG_ADT7461_EXT) {
if (val <= -64000)
return 0;
if (val >= 191750)
return 0xFFC0;
return (val + 64000 + 125) / 250 * 64;
} else {
if (val <= 0)
return 0;
if (val >= 127750)
return 0x7FC0;
return (val + 125) / 250 * 64;
}
}
/*
* 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);
int temp;
if (data->kind == adt7461 || data->kind == tmp451)
temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
else if (data->kind == max6646)
temp = temp_from_u8(data->temp8[attr->index]);
else
temp = temp_from_s8(data->temp8[attr->index]);
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && attr->index == 3)
temp += 16000;
return sprintf(buf, "%d\n", temp);
}
static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
static const u8 reg[TEMP8_REG_NUM] = {
LM90_REG_W_LOCAL_LOW,
LM90_REG_W_LOCAL_HIGH,
LM90_REG_W_LOCAL_CRIT,
LM90_REG_W_REMOTE_CRIT,
MAX6659_REG_W_LOCAL_EMERG,
MAX6659_REG_W_REMOTE_EMERG,
LM90_REG_W_REMOTE_CRIT,
MAX6659_REG_W_REMOTE_EMERG,
};
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int nr = attr->index;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err < 0)
return err;
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && attr->index == 3)
val -= 16000;
mutex_lock(&data->update_lock);
if (data->kind == adt7461 || data->kind == tmp451)
data->temp8[nr] = temp_to_u8_adt7461(data, val);
else if (data->kind == max6646)
data->temp8[nr] = temp_to_u8(val);
else
data->temp8[nr] = temp_to_s8(val);
lm90_select_remote_channel(client, data, nr >= 6);
i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]);
lm90_select_remote_channel(client, data, 0);
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_2 *attr = to_sensor_dev_attr_2(devattr);
struct lm90_data *data = lm90_update_device(dev);
int temp;
if (data->kind == adt7461 || data->kind == tmp451)
temp = temp_from_u16_adt7461(data, data->temp11[attr->index]);
else if (data->kind == max6646)
temp = temp_from_u16(data->temp11[attr->index]);
else
temp = temp_from_s16(data->temp11[attr->index]);
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && attr->index <= 2)
temp += 16000;
return sprintf(buf, "%d\n", temp);
}
static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct {
u8 high;
u8 low;
int channel;
} reg[5] = {
{ LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 0 },
{ LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 0 },
{ LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL, 0 },
{ LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 1 },
{ LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 1 }
};
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int nr = attr->nr;
int index = attr->index;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err < 0)
return err;
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && index <= 2)
val -= 16000;
mutex_lock(&data->update_lock);
if (data->kind == adt7461 || data->kind == tmp451)
data->temp11[index] = temp_to_u16_adt7461(data, val);
else if (data->kind == max6646)
data->temp11[index] = temp_to_u8(val) << 8;
else if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
data->temp11[index] = temp_to_s16(val);
else
data->temp11[index] = temp_to_s8(val) << 8;
lm90_select_remote_channel(client, data, reg[nr].channel);
i2c_smbus_write_byte_data(client, reg[nr].high,
data->temp11[index] >> 8);
if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
i2c_smbus_write_byte_data(client, reg[nr].low,
data->temp11[index] & 0xff);
lm90_select_remote_channel(client, data, 0);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_temphyst(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);
int temp;
if (data->kind == adt7461 || data->kind == tmp451)
temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
else if (data->kind == max6646)
temp = temp_from_u8(data->temp8[attr->index]);
else
temp = temp_from_s8(data->temp8[attr->index]);
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && attr->index == 3)
temp += 16000;
return sprintf(buf, "%d\n", temp - temp_from_s8(data->temp_hyst));
}
static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
const char *buf, size_t count)
{
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
long val;
int err;
int temp;
err = kstrtol(buf, 10, &val);
if (err < 0)
return err;
mutex_lock(&data->update_lock);
if (data->kind == adt7461 || data->kind == tmp451)
temp = temp_from_u8_adt7461(data, data->temp8[LOCAL_CRIT]);
else if (data->kind == max6646)
temp = temp_from_u8(data->temp8[LOCAL_CRIT]);
else
temp = temp_from_s8(data->temp8[LOCAL_CRIT]);
data->temp_hyst = hyst_to_reg(temp - val);
i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
data->temp_hyst);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
char *buf)
{
struct lm90_data *data = lm90_update_device(dev);
return sprintf(buf, "%d\n", data->alarms);
}
static ssize_t show_alarm(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);
int bitnr = attr->index;
return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
}
static ssize_t show_update_interval(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm90_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", data->update_interval);
}
static ssize_t set_update_interval(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
lm90_set_convrate(client, data, clamp_val(val, 0, 100000));
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp11, NULL,
0, LOCAL_TEMP);
static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp11, NULL,
0, REMOTE_TEMP);