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b50aa49638
linux/drivers/hwmon/lm90.c
Dmitry Osipenko b50aa49638 hwmon: (lm90) Prevent integer underflows of temperature calculations 
The min/max/crit and all other temperature values that are passed to
the driver are unlimited and value that is close to INT_MIN results in
integer underflow of the temperature calculations made by the driver
for LM99 sensor. Temperature hysteresis is among those values that need
to be limited, but limiting of hysteresis is independent from the sensor
version. Add the missing limits.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20210623042231.16008-2-digetx@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2021-06-24 07:14:27 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* Copyright (C) 2003-2010 Jean Delvare <jdelvare@suse.de>
*
* 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 MAX6654 chip made by Maxim. This chip can
* be at 9 different addresses, similar to MAX6680/MAX6681. The MAX6654 is
* otherwise similar to MAX6657/MAX6658/MAX6659. Extended range is available
* by setting the configuration register accordingly, and is done during
* initialization. Extended precision is only available at conversion rates
* of 1 Hz and slower. Note that extended precision is not enabled by
* default, as this driver initializes all chips to 2 Hz by design.
*
* 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.
*/
#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/err.h>
#include <linux/mutex.h>
#include <linux/of_device.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.
* MAX6654, 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, max6654 };
/*
* 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
/* MAX6646/6647/6649/6654/6657/6658/6659/6695/6696 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_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 */
#define LM90_PAUSE_FOR_CONFIG (1 << 8) /* Pause conversion for config */
/* 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 },
{ "max6654", max6654 },
{ "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);
static const struct of_device_id __maybe_unused lm90_of_match[] = {
{
.compatible = "adi,adm1032",
.data = (void *)adm1032
},
{
.compatible = "adi,adt7461",
.data = (void *)adt7461
},
{
.compatible = "adi,adt7461a",
.data = (void *)adt7461
},
{
.compatible = "gmt,g781",
.data = (void *)g781
},
{
.compatible = "national,lm90",
.data = (void *)lm90
},
{
.compatible = "national,lm86",
.data = (void *)lm86
},
{
.compatible = "national,lm89",
.data = (void *)lm86
},
{
.compatible = "national,lm99",
.data = (void *)lm99
},
{
.compatible = "dallas,max6646",
.data = (void *)max6646
},
{
.compatible = "dallas,max6647",
.data = (void *)max6646
},
{
.compatible = "dallas,max6649",
.data = (void *)max6646
},
{
.compatible = "dallas,max6654",
.data = (void *)max6654
},
{
.compatible = "dallas,max6657",
.data = (void *)max6657
},
{
.compatible = "dallas,max6658",
.data = (void *)max6657
},
{
.compatible = "dallas,max6659",
.data = (void *)max6659
},
{
.compatible = "dallas,max6680",
.data = (void *)max6680
},
{
.compatible = "dallas,max6681",
.data = (void *)max6680
},
{
.compatible = "dallas,max6695",
.data = (void *)max6696
},
{
.compatible = "dallas,max6696",
.data = (void *)max6696
},
{
.compatible = "onnn,nct1008",
.data = (void *)adt7461
},
{
.compatible = "winbond,w83l771",
.data = (void *)w83l771
},
{
.compatible = "nxp,sa56004",
.data = (void *)sa56004
},
{
.compatible = "ti,tmp451",
.data = (void *)tmp451
},
{ },
};
MODULE_DEVICE_TABLE(of, lm90_of_match);
/*
* 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,
},
[max6654] = {
.alert_alarms = 0x7c,
.max_convrate = 7,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6657] = {
.flags = LM90_PAUSE_FOR_CONFIG,
.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;
u32 channel_config[4];
struct hwmon_channel_info temp_info;
const struct hwmon_channel_info *info[3];
struct hwmon_chip_info chip;
struct mutex update_lock;
bool valid; /* true if register values are valid */
unsigned long last_updated; /* in jiffies */
int kind;
u32 flags;
unsigned int update_interval; /* in milliseconds */
u8 config; /* Current configuration register value */
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)
{
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);
return err;
}
static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl)
{
int 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.
*/
oldh = lm90_read_reg(client, regh);
if (oldh < 0)
return oldh;
l = lm90_read_reg(client, regl);
if (l < 0)
return l;
newh = lm90_read_reg(client, regh);
if (newh < 0)
return newh;
if (oldh != newh) {
l = lm90_read_reg(client, regl);
if (l < 0)
return l;
}
return (newh << 8) | l;
}
static int lm90_update_confreg(struct lm90_data *data, u8 config)
{
if (data->config != config) {
int err;
err = i2c_smbus_write_byte_data(data->client,
LM90_REG_W_CONFIG1,
config);
if (err)
return err;
data->config = config;
}
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 int lm90_select_remote_channel(struct lm90_data *data, int channel)
{
int err = 0;
if (data->kind == max6696) {
u8 config = data->config & ~0x08;
if (channel)
config |= 0x08;
err = lm90_update_confreg(data, config);
}
return err;
}
static int lm90_write_convrate(struct lm90_data *data, int val)
{
u8 config = data->config;
int err;
/* Save config and pause conversion */
if (data->flags & LM90_PAUSE_FOR_CONFIG) {
err = lm90_update_confreg(data, config | 0x40);
if (err < 0)
return err;
}
/* Set conv rate */
err = i2c_smbus_write_byte_data(data->client, LM90_REG_W_CONVRATE, val);
/* Revert change to config */
lm90_update_confreg(data, config);
return err;
}
/*
* Set conversion rate.
* client->update_lock must be held when calling this function (unless we are
* in detection or initialization steps).
*/
static int lm90_set_convrate(struct i2c_client *client, struct lm90_data *data,
unsigned int interval)
{
unsigned int update_interval;
int i, err;
/* 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;
err = lm90_write_convrate(data, i);
data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
return err;
}
static int lm90_update_limits(struct device *dev)
{
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int val;
val = lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT);
if (val < 0)
return val;
data->temp8[LOCAL_CRIT] = val;
val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT);
if (val < 0)
return val;
data->temp8[REMOTE_CRIT] = val;
val = lm90_read_reg(client, LM90_REG_R_TCRIT_HYST);
if (val < 0)
return val;
data->temp_hyst = val;
val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH);
if (val < 0)
return val;
data->temp11[REMOTE_LOW] = val << 8;
if (data->flags & LM90_HAVE_REM_LIMIT_EXT) {
val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL);
if (val < 0)
return val;
data->temp11[REMOTE_LOW] |= val;
}
val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH);
if (val < 0)
return val;
data->temp11[REMOTE_HIGH] = val << 8;
if (data->flags & LM90_HAVE_REM_LIMIT_EXT) {
val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL);
if (val < 0)
return val;
data->temp11[REMOTE_HIGH] |= val;
}
if (data->flags & LM90_HAVE_OFFSET) {
val = lm90_read16(client, LM90_REG_R_REMOTE_OFFSH,
LM90_REG_R_REMOTE_OFFSL);
if (val < 0)
return val;
data->temp11[REMOTE_OFFSET] = val;
}
if (data->flags & LM90_HAVE_EMERGENCY) {
val = lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG);
if (val < 0)
return val;
data->temp8[LOCAL_EMERG] = val;
val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG);
if (val < 0)
return val;
data->temp8[REMOTE_EMERG] = val;
}
if (data->kind == max6696) {
val = lm90_select_remote_channel(data, 1);
if (val < 0)
return val;
val = lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT);
if (val < 0)
return val;
data->temp8[REMOTE2_CRIT] = val;
val = lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG);
if (val < 0)
return val;
data->temp8[REMOTE2_EMERG] = val;
val = lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH);
if (val < 0)
return val;
data->temp11[REMOTE2_LOW] = val << 8;
val = lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH);
if (val < 0)
return val;
data->temp11[REMOTE2_HIGH] = val << 8;
lm90_select_remote_channel(data, 0);
}
return 0;
}
static int lm90_update_device(struct device *dev)
{
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
unsigned long next_update;
int val;
if (!data->valid) {
val = lm90_update_limits(dev);
if (val < 0)
return val;
}
next_update = data->last_updated +
msecs_to_jiffies(data->update_interval);
if (time_after(jiffies, next_update) || !data->valid) {
dev_dbg(&client->dev, "Updating lm90 data.\n");
data->valid = false;
val = lm90_read_reg(client, LM90_REG_R_LOCAL_LOW);
if (val < 0)
return val;
data->temp8[LOCAL_LOW] = val;
val = lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH);
if (val < 0)
return val;
data->temp8[LOCAL_HIGH] = val;
if (data->reg_local_ext) {
val = lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
data->reg_local_ext);
if (val < 0)
return val;
data->temp11[LOCAL_TEMP] = val;
} else {
val = lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP);
if (val < 0)
return val;
data->temp11[LOCAL_TEMP] = val << 8;
}
val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL);
if (val < 0)
return val;
data->temp11[REMOTE_TEMP] = val;
val = lm90_read_reg(client, LM90_REG_R_STATUS);
if (val < 0)
return val;
data->alarms = val; /* lower 8 bit of alarms */
if (data->kind == max6696) {
val = lm90_select_remote_channel(data, 1);
if (val < 0)
return val;
val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL);
if (val < 0) {
lm90_select_remote_channel(data, 0);
return val;
}
data->temp11[REMOTE2_TEMP] = val;
lm90_select_remote_channel(data, 0);
val = lm90_read_reg(client, MAX6696_REG_R_STATUS2);
if (val < 0)
return val;
data->alarms |= val << 8;
}
/*
* Re-enable ALERT# output if it was originally enabled and
* relevant alarms are all clear
*/
if (!(data->config_orig & 0x80) &&
!(data->alarms & data->alert_alarms)) {
if (data->config & 0x80) {
dev_dbg(&client->dev, "Re-enabling ALERT#\n");
lm90_update_confreg(data, data->config & ~0x80);
}
}
data->last_updated = jiffies;
data->valid = true;
}
return 0;
}
/*
* 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;
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;
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;
}
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;
}
if (val <= 0)
return 0;
if (val >= 127750)
return 0x7FC0;
return (val + 125) / 250 * 64;
}
/* pec used for ADM1032 only */
static ssize_t pec_show(struct device *dev, struct device_attribute *dummy,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
}
static ssize_t pec_store(struct device *dev, struct device_attribute *dummy,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err < 0)
return err;
switch (val) {
case 0:
client->flags &= ~I2C_CLIENT_PEC;
break;
case 1:
client->flags |= I2C_CLIENT_PEC;
break;
default:
return -EINVAL;
}
return count;
}
static DEVICE_ATTR_RW(pec);
static int lm90_get_temp11(struct lm90_data *data, int index)
{
s16 temp11 = data->temp11[index];
int temp;
if (data->kind == adt7461 || data->kind == tmp451)
temp = temp_from_u16_adt7461(data, temp11);
else if (data->kind == max6646)
temp = temp_from_u16(temp11);
else
temp = temp_from_s16(temp11);
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && index <= 2)
temp += 16000;
return temp;
}
static int lm90_set_temp11(struct lm90_data *data, int index, long val)
{
static struct reg {
u8 high;
u8 low;
} reg[] = {
[REMOTE_LOW] = { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL },
[REMOTE_HIGH] = { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL },
[REMOTE_OFFSET] = { LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL },
[REMOTE2_LOW] = { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL },
[REMOTE2_HIGH] = { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL }
};
struct i2c_client *client = data->client;
struct reg *regp = &reg[index];
int err;
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && index <= 2) {
/* prevent integer underflow */
val = max(val, -128000l);
val -= 16000;
}
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(data, index >= 3);
err = i2c_smbus_write_byte_data(client, regp->high,
data->temp11[index] >> 8);
if (err < 0)
return err;
if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
err = i2c_smbus_write_byte_data(client, regp->low,
data->temp11[index] & 0xff);
lm90_select_remote_channel(data, 0);
return err;
}
static int lm90_get_temp8(struct lm90_data *data, int index)
{
s8 temp8 = data->temp8[index];
int temp;
if (data->kind == adt7461 || data->kind == tmp451)
temp = temp_from_u8_adt7461(data, temp8);
else if (data->kind == max6646)
temp = temp_from_u8(temp8);
else
temp = temp_from_s8(temp8);
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && index == 3)
temp += 16000;
return temp;
}
static int lm90_set_temp8(struct lm90_data *data, int index, long val)
{
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 i2c_client *client = data->client;
int err;
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && index == 3) {
/* prevent integer underflow */
val = max(val, -128000l);
val -= 16000;
}
if (data->kind == adt7461 || data->kind == tmp451)
data->temp8[index] = temp_to_u8_adt7461(data, val);
else if (data->kind == max6646)
data->temp8[index] = temp_to_u8(val);
else
data->temp8[index] = temp_to_s8(val);
lm90_select_remote_channel(data, index >= 6);
err = i2c_smbus_write_byte_data(client, reg[index], data->temp8[index]);
lm90_select_remote_channel(data, 0);
return err;
}
static int lm90_get_temphyst(struct lm90_data *data, int index)
{
int temp;
if (data->kind == adt7461 || data->kind == tmp451)
temp = temp_from_u8_adt7461(data, data->temp8[index]);
else if (data->kind == max6646)
temp = temp_from_u8(data->temp8[index]);
else
temp = temp_from_s8(data->temp8[index]);
/* +16 degrees offset for temp2 for the LM99 */
if (data->kind == lm99 && index == 3)
temp += 16000;
return temp - temp_from_s8(data->temp_hyst);
}
static int lm90_set_temphyst(struct lm90_data *data, long val)
{
struct i2c_client *client = data->client;
int temp;
int err;
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]);
/* prevent integer underflow */
val = max(val, -128000l);
data->temp_hyst = hyst_to_reg(temp - val);
err = i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
data->temp_hyst);
return err;
}
static const u8 lm90_temp_index[3] = {
LOCAL_TEMP, REMOTE_TEMP, REMOTE2_TEMP
};
static const u8 lm90_temp_min_index[3] = {
LOCAL_LOW, REMOTE_LOW, REMOTE2_LOW
};
static const u8 lm90_temp_max_index[3] = {
LOCAL_HIGH, REMOTE_HIGH, REMOTE2_HIGH
};
static const u8 lm90_temp_crit_index[3] = {
LOCAL_CRIT, REMOTE_CRIT, REMOTE2_CRIT
};
static const u8 lm90_temp_emerg_index[3] = {
LOCAL_EMERG, REMOTE_EMERG, REMOTE2_EMERG
};
static const u8 lm90_min_alarm_bits[3] = { 5, 3, 11 };
static const u8 lm90_max_alarm_bits[3] = { 6, 4, 12 };
static const u8 lm90_crit_alarm_bits[3] = { 0, 1, 9 };
static const u8 lm90_emergency_alarm_bits[3] = { 15, 13, 14 };
static const u8 lm90_fault_bits[3] = { 0, 2, 10 };
static int lm90_temp_read(struct device *dev, u32 attr, int channel, long *val)
{
struct lm90_data *data = dev_get_drvdata(dev);
int err;
mutex_lock(&data->update_lock);
err = lm90_update_device(dev);
mutex_unlock(&data->update_lock);
if (err)
return err;
switch (attr) {
case hwmon_temp_input:
*val = lm90_get_temp11(data, lm90_temp_index[channel]);
break;
case hwmon_temp_min_alarm:
*val = (data->alarms >> lm90_min_alarm_bits[channel]) & 1;
break;
case hwmon_temp_max_alarm:
*val = (data->alarms >> lm90_max_alarm_bits[channel]) & 1;
break;
case hwmon_temp_crit_alarm:
*val = (data->alarms >> lm90_crit_alarm_bits[channel]) & 1;
break;
case hwmon_temp_emergency_alarm:
*val = (data->alarms >> lm90_emergency_alarm_bits[channel]) & 1;
break;
case hwmon_temp_fault:
*val = (data->alarms >> lm90_fault_bits[channel]) & 1;
break;
case hwmon_temp_min:
if (channel == 0)
*val = lm90_get_temp8(data,
lm90_temp_min_index[channel]);
else
*val = lm90_get_temp11(data,
lm90_temp_min_index[channel]);
break;
case hwmon_temp_max:
if (channel == 0)
*val = lm90_get_temp8(data,
lm90_temp_max_index[channel]);
else
*val = lm90_get_temp11(data,
lm90_temp_max_index[channel]);
break;
case hwmon_temp_crit:
*val = lm90_get_temp8(data, lm90_temp_crit_index[channel]);
break;
case hwmon_temp_crit_hyst:
*val = lm90_get_temphyst(data, lm90_temp_crit_index[channel]);
break;
case hwmon_temp_emergency:
*val = lm90_get_temp8(data, lm90_temp_emerg_index[channel]);
break;
case hwmon_temp_emergency_hyst:
*val = lm90_get_temphyst(data, lm90_temp_emerg_index[channel]);
break;
case hwmon_temp_offset:
*val = lm90_get_temp11(data, REMOTE_OFFSET);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int lm90_temp_write(struct device *dev, u32 attr, int channel, long val)
{
struct lm90_data *data = dev_get_drvdata(dev);
int err;
mutex_lock(&data->update_lock);
err = lm90_update_device(dev);
if (err)
goto error;
switch (attr) {
case hwmon_temp_min:
if (channel == 0)
err = lm90_set_temp8(data,
lm90_temp_min_index[channel],
val);
else
err = lm90_set_temp11(data,
lm90_temp_min_index[channel],
val);
break;
case hwmon_temp_max:
if (channel == 0)
err = lm90_set_temp8(data,
lm90_temp_max_index[channel],
val);
else
err = lm90_set_temp11(data,
lm90_temp_max_index[channel],
val);
break;
case hwmon_temp_crit:
err = lm90_set_temp8(data, lm90_temp_crit_index[channel], val);
break;
case hwmon_temp_crit_hyst:
err = lm90_set_temphyst(data, val);
break;
case hwmon_temp_emergency:
err = lm90_set_temp8(data, lm90_temp_emerg_index[channel], val);
break;
case hwmon_temp_offset:
err = lm90_set_temp11(data, REMOTE_OFFSET, val);
break;
default:
err = -EOPNOTSUPP;
break;
}
error:
mutex_unlock(&data->update_lock);
return err;
}
static umode_t lm90_temp_is_visible(const void *data, u32 attr, int channel)
{
switch (attr) {
case hwmon_temp_input:
case hwmon_temp_min_alarm:
case hwmon_temp_max_alarm:
case hwmon_temp_crit_alarm:
case hwmon_temp_emergency_alarm:
case hwmon_temp_emergency_hyst:
case hwmon_temp_fault:
return 0444;
case hwmon_temp_min:
case hwmon_temp_max:
case hwmon_temp_crit:
case hwmon_temp_emergency:
case hwmon_temp_offset:
return 0644;
case hwmon_temp_crit_hyst:
if (channel == 0)
return 0644;
return 0444;
default:
return 0;
}
}
static int lm90_chip_read(struct device *dev, u32 attr, int channel, long *val)
{
struct lm90_data *data = dev_get_drvdata(dev);
int err;
mutex_lock(&data->update_lock);
err = lm90_update_device(dev);
mutex_unlock(&data->update_lock);
if (err)
return err;
switch (attr) {
case hwmon_chip_update_interval:
*val = data->update_interval;
break;
case hwmon_chip_alarms:
*val = data->alarms;
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int lm90_chip_write(struct device *dev, u32 attr, int channel, long val)
{
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int err;
mutex_lock(&data->update_lock);
err = lm90_update_device(dev);
if (err)
goto error;
switch (attr) {
case hwmon_chip_update_interval:
err = lm90_set_convrate(client, data,
clamp_val(val, 0, 100000));
break;
default:
err = -EOPNOTSUPP;
break;
}
error:
mutex_unlock(&data->update_lock);
return err;
}
static umode_t lm90_chip_is_visible(const void *data, u32 attr, int channel)
{
switch (attr) {
case hwmon_chip_update_interval:
return 0644;
case hwmon_chip_alarms:
return 0444;
default:
return 0;
}
}
static int lm90_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
switch (type) {
case hwmon_chip:
return lm90_chip_read(dev, attr, channel, val);
case hwmon_temp:
return lm90_temp_read(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static int lm90_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
switch (type) {
case hwmon_chip:
return lm90_chip_write(dev, attr, channel, val);
case hwmon_temp:
return lm90_temp_write(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static umode_t lm90_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (type) {
case hwmon_chip:
return lm90_chip_is_visible(data, attr, channel);
case hwmon_temp:
return lm90_temp_is_visible(data, attr, channel);
default:
return 0;
}
}
/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm90_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
int address = client->addr;
const char *name = NULL;
int man_id, chip_id, config1, config2, convrate;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/* detection and identification */
man_id = i2c_smbus_read_byte_data(client, LM90_REG_R_MAN_ID);
chip_id = i2c_smbus_read_byte_data(client, LM90_REG_R_CHIP_ID);
config1 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1);
convrate = i2c_smbus_read_byte_data(client, LM90_REG_R_CONVRATE);
if (man_id < 0 || chip_id < 0 || config1 < 0 || convrate < 0)
return -ENODEV;
if (man_id == 0x01 || man_id == 0x5C || man_id == 0x41) {
config2 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG2);
if (config2 < 0)
return -ENODEV;
} else
config2 = 0; /* Make compiler happy */
if ((address == 0x4C || address == 0x4D)
&& man_id == 0x01) { /* National Semiconductor */
if ((config1 & 0x2A) == 0x00
&& (config2 & 0xF8) == 0x00
&& convrate <= 0x09) {
if (address == 0x4C
&& (chip_id & 0xF0) == 0x20) { /* LM90 */
name = "lm90";
} else
if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
name = "lm99";
dev_info(&adapter->dev,
"Assuming LM99 chip at 0x%02x\n",
address);
dev_info(&adapter->dev,
"If it is an LM89, instantiate it "
"with the new_device sysfs "
"interface\n");
} else
if (address == 0x4C
&& (chip_id & 0xF0) == 0x10) { /* LM86 */
name = "lm86";
}
}
} else
if ((address == 0x4C || address == 0x4D)
&& man_id == 0x41) { /* Analog Devices */
if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
&& (config1 & 0x3F) == 0x00
&& convrate <= 0x0A) {
name = "adm1032";
/*
* The ADM1032 supports PEC, but only if combined
* transactions are not used.
*/
if (i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_BYTE))
info->flags |= I2C_CLIENT_PEC;
} else
if (chip_id == 0x51 /* ADT7461 */
&& (config1 & 0x1B) == 0x00
&& convrate <= 0x0A) {
name = "adt7461";
} else
if (chip_id == 0x57 /* ADT7461A, NCT1008 */
&& (config1 & 0x1B) == 0x00
&& convrate <= 0x0A) {
name = "adt7461a";
}
} else
if (man_id == 0x4D) { /* Maxim */
int emerg, emerg2, status2;
/*
* We read MAX6659_REG_R_REMOTE_EMERG twice, and re-read
* LM90_REG_R_MAN_ID in between. If MAX6659_REG_R_REMOTE_EMERG
* exists, both readings will reflect the same value. Otherwise,
* the readings will be different.
*/
emerg = i2c_smbus_read_byte_data(client,
MAX6659_REG_R_REMOTE_EMERG);
man_id = i2c_smbus_read_byte_data(client,
LM90_REG_R_MAN_ID);
emerg2 = i2c_smbus_read_byte_data(client,
MAX6659_REG_R_REMOTE_EMERG);
status2 = i2c_smbus_read_byte_data(client,
MAX6696_REG_R_STATUS2);
if (emerg < 0 || man_id < 0 || emerg2 < 0 || status2 < 0)
return -ENODEV;
/*
* The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id
* register. Reading from that address will return the last
* read value, which in our case is those of the man_id
* register. Likewise, the config1 register seems to lack a
* low nibble, so the value will be those of the previous
* read, so in our case those of the man_id register.
* MAX6659 has a third set of upper temperature limit registers.
* Those registers also return values on MAX6657 and MAX6658,
* thus the only way to detect MAX6659 is by its address.
* For this reason it will be mis-detected as MAX6657 if its
* address is 0x4C.
*/
if (chip_id == man_id
&& (address == 0x4C || address == 0x4D || address == 0x4E)
&& (config1 & 0x1F) == (man_id & 0x0F)
&& convrate <= 0x09) {
if (address == 0x4C)
name = "max6657";
else
name = "max6659";
} else
/*
* Even though MAX6695 and MAX6696 do not have a chip ID
* register, reading it returns 0x01. Bit 4 of the config1
* register is unused and should return zero when read. Bit 0 of
* the status2 register is unused and should return zero when
* read.
*
* MAX6695 and MAX6696 have an additional set of temperature
* limit registers. We can detect those chips by checking if
* one of those registers exists.
*/
if (chip_id == 0x01
&& (config1 & 0x10) == 0x00
&& (status2 & 0x01) == 0x00
&& emerg == emerg2
&& convrate <= 0x07) {
name = "max6696";
} else
/*
* The chip_id register of the MAX6680 and MAX6681 holds the
* revision of the chip. The lowest bit of the config1 register
* is unused and should return zero when read, so should the
* second to last bit of config1 (software reset).
*/
if (chip_id == 0x01
&& (config1 & 0x03) == 0x00
&& convrate <= 0x07) {
name = "max6680";
} else
/*
* The chip_id register of the MAX6646/6647/6649 holds the
* revision of the chip. The lowest 6 bits of the config1
* register are unused and should return zero when read.
*/
if (chip_id == 0x59
&& (config1 & 0x3f) == 0x00
&& convrate <= 0x07) {
name = "max6646";
} else
/*
* The chip_id of the MAX6654 holds the revision of the chip.
* The lowest 3 bits of the config1 register are unused and
* should return zero when read.
*/
if (chip_id == 0x08
&& (config1 & 0x07) == 0x00
&& convrate <= 0x07) {
name = "max6654";
}
} else
if (address == 0x4C
&& man_id == 0x5C) { /* Winbond/Nuvoton */
if ((config1 & 0x2A) == 0x00
&& (config2 & 0xF8) == 0x00) {
if (chip_id == 0x01 /* W83L771W/G */
&& convrate <= 0x09) {
name = "w83l771";
} else
if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */
&& convrate <= 0x08) {
name = "w83l771";
}
}
} else
if (address >= 0x48 && address <= 0x4F
&& man_id == 0xA1) { /* NXP Semiconductor/Philips */
if (chip_id == 0x00
&& (config1 & 0x2A) == 0x00
&& (config2 & 0xFE) == 0x00
&& convrate <= 0x09) {
name = "sa56004";
}
} else
if ((address == 0x4C || address == 0x4D)
&& man_id == 0x47) { /* GMT */
if (chip_id == 0x01 /* G781 */
&& (config1 & 0x3F) == 0x00
&& convrate <= 0x08)
name = "g781";
} else
if (address == 0x4C
&& man_id == 0x55) { /* Texas Instruments */
int local_ext;
local_ext = i2c_smbus_read_byte_data(client,
TMP451_REG_R_LOCAL_TEMPL);
if (chip_id == 0x00 /* TMP451 */
&& (config1 & 0x1B) == 0x00
&& convrate <= 0x09
&& (local_ext & 0x0F) == 0x00)
name = "tmp451";
}
if (!name) { /* identification failed */
dev_dbg(&adapter->dev,
"Unsupported chip at 0x%02x (man_id=0x%02X, "
"chip_id=0x%02X)\n", address, man_id, chip_id);
return -ENODEV;
}
strlcpy(info->type, name, I2C_NAME_SIZE);
return 0;
}
static void lm90_restore_conf(void *_data)
{
struct lm90_data *data = _data;
struct i2c_client *client = data->client;
/* Restore initial configuration */
lm90_write_convrate(data, data->convrate_orig);
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
data->config_orig);
}
static int lm90_init_client(struct i2c_client *client, struct lm90_data *data)
{
int config, convrate;
convrate = lm90_read_reg(client, LM90_REG_R_CONVRATE);
if (convrate < 0)
return convrate;
data->convrate_orig = convrate;
/*
* Start the conversions.
*/
config = lm90_read_reg(client, LM90_REG_R_CONFIG1);
if (config < 0)
return config;
data->config_orig = config;
data->config = config;
lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */
/* Check Temperature Range Select */
if (data->kind == adt7461 || data->kind == tmp451) {
if (config & 0x04)
data->flags |= LM90_FLAG_ADT7461_EXT;
}
/*
* Put MAX6680/MAX8881 into extended resolution (bit 0x10,
* 0.125 degree resolution) and range (0x08, extend range
* to -64 degree) mode for the remote temperature sensor.
*/
if (data->kind == max6680)
config |= 0x18;
/*
* Put MAX6654 into extended range (0x20, extend minimum range from
* 0 degrees to -64 degrees). Note that extended resolution is not
* possible on the MAX6654 unless conversion rate is set to 1 Hz or
* slower, which is intentionally not done by default.
*/
if (data->kind == max6654)
config |= 0x20;
/*
* Select external channel 0 for max6695/96
*/
if (data->kind == max6696)
config &= ~0x08;
/*
* Interrupt is enabled by default on reset, but it may be disabled
* by bootloader, unmask it.
*/
if (client->irq)
config &= ~0x80;
config &= 0xBF; /* run */
lm90_update_confreg(data, config);
return devm_add_action_or_reset(&client->dev, lm90_restore_conf, data);
}
static bool lm90_is_tripped(struct i2c_client *client, u16 *status)
{
struct lm90_data *data = i2c_get_clientdata(client);
int st, st2 = 0;
st = lm90_read_reg(client, LM90_REG_R_STATUS);
if (st < 0)
return false;
if (data->kind == max6696) {
st2 = lm90_read_reg(client, MAX6696_REG_R_STATUS2);
if (st2 < 0)
return false;
}
*status = st | (st2 << 8);
if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0)
return false;
if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) ||
(st2 & MAX6696_STATUS2_LOT2))
dev_dbg(&client->dev,
"temp%d out of range, please check!\n", 1);
if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) ||
(st2 & MAX6696_STATUS2_ROT2))
dev_dbg(&client->dev,
"temp%d out of range, please check!\n", 2);
if (st & LM90_STATUS_ROPEN)
dev_dbg(&client->dev,
"temp%d diode open, please check!\n", 2);
if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH |
MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2))
dev_dbg(&client->dev,
"temp%d out of range, please check!\n", 3);
if (st2 & MAX6696_STATUS2_R2OPEN)
dev_dbg(&client->dev,
"temp%d diode open, please check!\n", 3);
if (st & LM90_STATUS_LLOW)
hwmon_notify_event(data->hwmon_dev, hwmon_temp,
hwmon_temp_min, 0);
if (st & LM90_STATUS_RLOW)
hwmon_notify_event(data->hwmon_dev, hwmon_temp,
hwmon_temp_min, 1);
if (st2 & MAX6696_STATUS2_R2LOW)
hwmon_notify_event(data->hwmon_dev, hwmon_temp,
hwmon_temp_min, 2);
if (st & LM90_STATUS_LHIGH)
hwmon_notify_event(data->hwmon_dev, hwmon_temp,
hwmon_temp_max, 0);
if (st & LM90_STATUS_RHIGH)
hwmon_notify_event(data->hwmon_dev, hwmon_temp,
hwmon_temp_max, 1);
if (st2 & MAX6696_STATUS2_R2HIGH)
hwmon_notify_event(data->hwmon_dev, hwmon_temp,
hwmon_temp_max, 2);
return true;
}
static irqreturn_t lm90_irq_thread(int irq, void *dev_id)
{
struct i2c_client *client = dev_id;
u16 status;
if (lm90_is_tripped(client, &status))
return IRQ_HANDLED;
else
return IRQ_NONE;
}
static void lm90_remove_pec(void *dev)
{
device_remove_file(dev, &dev_attr_pec);
}
static void lm90_regulator_disable(void *regulator)
{
regulator_disable(regulator);
}
static const struct hwmon_ops lm90_ops = {
.is_visible = lm90_is_visible,
.read = lm90_read,
.write = lm90_write,
};
static int lm90_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct i2c_adapter *adapter = client->adapter;
struct hwmon_channel_info *info;
struct regulator *regulator;
struct device *hwmon_dev;
struct lm90_data *data;
int err;
regulator = devm_regulator_get(dev, "vcc");
if (IS_ERR(regulator))
return PTR_ERR(regulator);
err = regulator_enable(regulator);
if (err < 0) {
dev_err(dev, "Failed to enable regulator: %d\n", err);
return err;
}
err = devm_add_action_or_reset(dev, lm90_regulator_disable, regulator);
if (err)
return err;
data = devm_kzalloc(dev, sizeof(struct lm90_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/* Set the device type */
if (client->dev.of_node)
data->kind = (enum chips)of_device_get_match_data(&client->dev);
else
data->kind = i2c_match_id(lm90_id, client)->driver_data;
if (data->kind == adm1032) {
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
client->flags &= ~I2C_CLIENT_PEC;
}
/*
* Different devices have different alarm bits triggering the
* ALERT# output
*/
data->alert_alarms = lm90_params[data->kind].alert_alarms;
/* Set chip capabilities */
data->flags = lm90_params[data->kind].flags;
data->chip.ops = &lm90_ops;
data->chip.info = data->info;
data->info[0] = HWMON_CHANNEL_INFO(chip,
HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL | HWMON_C_ALARMS);
data->info[1] = &data->temp_info;
info = &data->temp_info;
info->type = hwmon_temp;
info->config = data->channel_config;
data->channel_config[0] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM;
data->channel_config[1] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT;
if (data->flags & LM90_HAVE_OFFSET)
data->channel_config[1] |= HWMON_T_OFFSET;
if (data->flags & LM90_HAVE_EMERGENCY) {
data->channel_config[0] |= HWMON_T_EMERGENCY |
HWMON_T_EMERGENCY_HYST;
data->channel_config[1] |= HWMON_T_EMERGENCY |
HWMON_T_EMERGENCY_HYST;
}
if (data->flags & LM90_HAVE_EMERGENCY_ALARM) {
data->channel_config[0] |= HWMON_T_EMERGENCY_ALARM;
data->channel_config[1] |= HWMON_T_EMERGENCY_ALARM;
}
if (data->flags & LM90_HAVE_TEMP3) {
data->channel_config[2] = HWMON_T_INPUT |
HWMON_T_MIN | HWMON_T_MAX |
HWMON_T_CRIT | HWMON_T_CRIT_HYST |
HWMON_T_EMERGENCY | HWMON_T_EMERGENCY_HYST |
HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY_ALARM |
HWMON_T_FAULT;
}
data->reg_local_ext = lm90_params[data->kind].reg_local_ext;
/* Set maximum conversion rate */
data->max_convrate = lm90_params[data->kind].max_convrate;
/* Initialize the LM90 chip */
err = lm90_init_client(client, data);
if (err < 0) {
dev_err(dev, "Failed to initialize device\n");
return err;
}
/*
* The 'pec' attribute is attached to the i2c device and thus created
* separately.
*/
if (client->flags & I2C_CLIENT_PEC) {
err = device_create_file(dev, &dev_attr_pec);
if (err)
return err;
err = devm_add_action_or_reset(dev, lm90_remove_pec, dev);
if (err)
return err;
}
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
data, &data->chip,
NULL);
if (IS_ERR(hwmon_dev))
return PTR_ERR(hwmon_dev);
data->hwmon_dev = hwmon_dev;
if (client->irq) {
dev_dbg(dev, "IRQ: %d\n", client->irq);
err = devm_request_threaded_irq(dev, client->irq,
NULL, lm90_irq_thread,
IRQF_ONESHOT, "lm90", client);
if (err < 0) {
dev_err(dev, "cannot request IRQ %d\n", client->irq);
return err;
}
}
return 0;
}
static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type,
unsigned int flag)
{
u16 alarms;
if (type != I2C_PROTOCOL_SMBUS_ALERT)
return;
if (lm90_is_tripped(client, &alarms)) {
/*
* Disable ALERT# output, because these chips don't implement
* SMBus alert correctly; they should only hold the alert line
* low briefly.
*/
struct lm90_data *data = i2c_get_clientdata(client);
if ((data->flags & LM90_HAVE_BROKEN_ALERT) &&
(alarms & data->alert_alarms)) {
dev_dbg(&client->dev, "Disabling ALERT#\n");
lm90_update_confreg(data, data->config | 0x80);
}
} else {
dev_dbg(&client->dev, "Everything OK\n");
}
}
static int __maybe_unused lm90_suspend(struct device *dev)
{
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
if (client->irq)
disable_irq(client->irq);
return 0;
}
static int __maybe_unused lm90_resume(struct device *dev)
{
struct lm90_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
if (client->irq)
enable_irq(client->irq);
return 0;
}
static SIMPLE_DEV_PM_OPS(lm90_pm_ops, lm90_suspend, lm90_resume);
static struct i2c_driver lm90_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm90",
.of_match_table = of_match_ptr(lm90_of_match),
.pm = &lm90_pm_ops,
},
.probe_new = lm90_probe,
.alert = lm90_alert,
.id_table = lm90_id,
.detect = lm90_detect,
.address_list = normal_i2c,
};
module_i2c_driver(lm90_driver);
MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("LM90/ADM1032 driver");
MODULE_LICENSE("GPL");
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