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linux-next/drivers/hwmon/lm90.c
Jean Delvare 78c2c2fe59 hwmon: (lm90) Drop redundant safety on cache lifetime 
time_after (as opposed to time_after_equal) already ensures that the
cache lifetime is at least as much as requested. There is no point in
manually adding another jiffy to that value, and this can confuse the
reader into wrong interpretation.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Imre Deak <imre.deak@intel.com>
2013-07-08 14:18:24 +02:00

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/*
* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* Copyright (C) 2003-2010 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.
*
* 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.
*
* 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, 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 };
/*
* 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 */
/*
* 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 */
/*
* 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 },
{ }
};
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 = 0x187c,
.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,
},
};
/*
* Client data (each client gets its own)
*/
struct lm90_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;
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[8]; /* 0: local low limit
* 1: local high limit
* 2: local critical limit
* 3: remote critical limit
* 4: local emergency limit (max6659 and max6695/96)
* 5: remote emergency limit (max6659 and max6695/96)
* 6: remote 2 critical limit (max6695/96 only)
* 7: remote 2 emergency limit (max6695/96 only)
*/
s16 temp11[8]; /* 0: remote input
* 1: remote low limit
* 2: remote high limit
* 3: remote offset (except max6646, max6657/58/59,
* and max6695/96)
* 4: local input
* 5: remote 2 input (max6695/96 only)
* 6: remote 2 low limit (max6695/96 only)
* 7: remote 2 high limit (max6695/96 only)
*/
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 i2c_client *client = to_i2c_client(dev);
struct lm90_data *data = i2c_get_clientdata(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[0]);
lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]);
lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]);
lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]);
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[4]);
} else {
if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
&h) == 0)
data->temp11[4] = h << 8;
}
lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]);
if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
data->temp11[1] = h << 8;
if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
&& lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
&l) == 0)
data->temp11[1] |= l;
}
if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
data->temp11[2] = h << 8;
if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
&& lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
&l) == 0)
data->temp11[2] |= 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[3] = (h << 8) | l;
}
if (data->flags & LM90_HAVE_EMERGENCY) {
lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG,
&data->temp8[4]);
lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
&data->temp8[5]);
}
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[6]);
lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
&data->temp8[7]);
lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL, &data->temp11[5]);
if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h))
data->temp11[6] = h << 8;
if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
data->temp11[7] = 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)
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[8] = {
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 i2c_client *client = to_i2c_client(dev);
struct lm90_data *data = i2c_get_clientdata(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->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)
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 i2c_client *client = to_i2c_client(dev);
struct lm90_data *data = i2c_get_clientdata(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->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)
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 i2c_client *client = to_i2c_client(dev);
struct lm90_data *data = i2c_get_clientdata(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)
temp = temp_from_u8_adt7461(data, data->temp8[2]);
else if (data->kind == max6646)
temp = temp_from_u8(data->temp8[2]);
else
temp = temp_from_s8(data->temp8[2]);
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 i2c_client *client = to_i2c_client(dev);
struct lm90_data *data = i2c_get_clientdata(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, 4);
static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp11, NULL, 0, 0);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 0);
static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 0, 1);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 1);
static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 1, 2);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 2);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 3);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
set_temphyst, 2);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 3);
static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 2, 3);
/* Individual alarm files */
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
/* Raw alarm file for compatibility */
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
set_update_interval);
static struct attribute *lm90_attributes[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp1_min.dev_attr.attr,
&sensor_dev_attr_temp2_min.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&dev_attr_alarms.attr,
&dev_attr_update_interval.attr,
NULL
};
static const struct attribute_group lm90_group = {
.attrs = lm90_attributes,
};
/*
* Additional attributes for devices with emergency sensors
*/
static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 4);
static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 5);
static SENSOR_DEVICE_ATTR(temp1_emergency_hyst, S_IRUGO, show_temphyst,
NULL, 4);
static SENSOR_DEVICE_ATTR(temp2_emergency_hyst, S_IRUGO, show_temphyst,
NULL, 5);
static struct attribute *lm90_emergency_attributes[] = {
&sensor_dev_attr_temp1_emergency.dev_attr.attr,
&sensor_dev_attr_temp2_emergency.dev_attr.attr,
&sensor_dev_attr_temp1_emergency_hyst.dev_attr.attr,
&sensor_dev_attr_temp2_emergency_hyst.dev_attr.attr,
NULL
};
static const struct attribute_group lm90_emergency_group = {
.attrs = lm90_emergency_attributes,
};
static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 15);
static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 13);
static struct attribute *lm90_emergency_alarm_attributes[] = {
&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group lm90_emergency_alarm_group = {
.attrs = lm90_emergency_alarm_attributes,
};
/*
* Additional attributes for devices with 3 temperature sensors
*/
static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp11, NULL, 0, 5);
static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 3, 6);
static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 4, 7);
static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 6);
static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temphyst, NULL, 6);
static SENSOR_DEVICE_ATTR(temp3_emergency, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 7);
static SENSOR_DEVICE_ATTR(temp3_emergency_hyst, S_IRUGO, show_temphyst,
NULL, 7);
static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 10);
static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 11);
static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 12);
static SENSOR_DEVICE_ATTR(temp3_emergency_alarm, S_IRUGO, show_alarm, NULL, 14);
static struct attribute *lm90_temp3_attributes[] = {
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_min.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp3_crit.dev_attr.attr,
&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp3_emergency.dev_attr.attr,
&sensor_dev_attr_temp3_emergency_hyst.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_emergency_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group lm90_temp3_group = {
.attrs = lm90_temp3_attributes,
};
/* pec used for ADM1032 only */
static ssize_t show_pec(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 set_pec(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(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
/*
* Real code
*/
/* 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
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";
}
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_remove_files(struct i2c_client *client, struct lm90_data *data)
{
struct device *dev = &client->dev;
if (data->flags & LM90_HAVE_TEMP3)
sysfs_remove_group(&dev->kobj, &lm90_temp3_group);
if (data->flags & LM90_HAVE_EMERGENCY_ALARM)
sysfs_remove_group(&dev->kobj, &lm90_emergency_alarm_group);
if (data->flags & LM90_HAVE_EMERGENCY)
sysfs_remove_group(&dev->kobj, &lm90_emergency_group);
if (data->flags & LM90_HAVE_OFFSET)
device_remove_file(dev, &sensor_dev_attr_temp2_offset.dev_attr);
device_remove_file(dev, &dev_attr_pec);
sysfs_remove_group(&dev->kobj, &lm90_group);
}
static void lm90_restore_conf(struct i2c_client *client, struct lm90_data *data)
{
/* Restore initial configuration */
i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
data->convrate_orig);
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
data->config_orig);
}
static void lm90_init_client(struct i2c_client *client)
{
u8 config, convrate;
struct lm90_data *data = i2c_get_clientdata(client);
if (lm90_read_reg(client, LM90_REG_R_CONVRATE, &convrate) < 0) {
dev_warn(&client->dev, "Failed to read convrate register!\n");
convrate = LM90_DEF_CONVRATE_RVAL;
}
data->convrate_orig = convrate;
/*
* Start the conversions.
*/
lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */
if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
dev_warn(&client->dev, "Initialization failed!\n");
return;
}
data->config_orig = config;
/* Check Temperature Range Select */
if (data->kind == adt7461) {
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;
/*
* Select external channel 0 for max6695/96
*/
if (data->kind == max6696)
config &= ~0x08;
config &= 0xBF; /* run */
if (config != data->config_orig) /* Only write if changed */
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
}
static int lm90_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct i2c_adapter *adapter = to_i2c_adapter(dev->parent);
struct lm90_data *data;
int err;
data = devm_kzalloc(&client->dev, sizeof(struct lm90_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/* Set the device type */
data->kind = id->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->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 */
lm90_init_client(client);
/* Register sysfs hooks */
err = sysfs_create_group(&dev->kobj, &lm90_group);
if (err)
goto exit_restore;
if (client->flags & I2C_CLIENT_PEC) {
err = device_create_file(dev, &dev_attr_pec);
if (err)
goto exit_remove_files;
}
if (data->flags & LM90_HAVE_OFFSET) {
err = device_create_file(dev,
&sensor_dev_attr_temp2_offset.dev_attr);
if (err)
goto exit_remove_files;
}
if (data->flags & LM90_HAVE_EMERGENCY) {
err = sysfs_create_group(&dev->kobj, &lm90_emergency_group);
if (err)
goto exit_remove_files;
}
if (data->flags & LM90_HAVE_EMERGENCY_ALARM) {
err = sysfs_create_group(&dev->kobj,
&lm90_emergency_alarm_group);
if (err)
goto exit_remove_files;
}
if (data->flags & LM90_HAVE_TEMP3) {
err = sysfs_create_group(&dev->kobj, &lm90_temp3_group);
if (err)
goto exit_remove_files;
}
data->hwmon_dev = hwmon_device_register(dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
goto exit_remove_files;
}
return 0;
exit_remove_files:
lm90_remove_files(client, data);
exit_restore:
lm90_restore_conf(client, data);
return err;
}
static int lm90_remove(struct i2c_client *client)
{
struct lm90_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
lm90_remove_files(client, data);
lm90_restore_conf(client, data);
return 0;
}
static void lm90_alert(struct i2c_client *client, unsigned int flag)
{
struct lm90_data *data = i2c_get_clientdata(client);
u8 config, alarms, alarms2 = 0;
lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
if (data->kind == max6696)
lm90_read_reg(client, MAX6696_REG_R_STATUS2, &alarms2);
if ((alarms & 0x7f) == 0 && (alarms2 & 0xfe) == 0) {
dev_info(&client->dev, "Everything OK\n");
} else {
if (alarms & 0x61)
dev_warn(&client->dev,
"temp%d out of range, please check!\n", 1);
if (alarms & 0x1a)
dev_warn(&client->dev,
"temp%d out of range, please check!\n", 2);
if (alarms & 0x04)
dev_warn(&client->dev,
"temp%d diode open, please check!\n", 2);
if (alarms2 & 0x18)
dev_warn(&client->dev,
"temp%d out of range, please check!\n", 3);
/*
* Disable ALERT# output, because these chips don't implement
* SMBus alert correctly; they should only hold the alert line
* low briefly.
*/
if ((data->flags & LM90_HAVE_BROKEN_ALERT)
&& (alarms & data->alert_alarms)) {
dev_dbg(&client->dev, "Disabling ALERT#\n");
lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
config | 0x80);
}
}
}
static struct i2c_driver lm90_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm90",
},
.probe = lm90_probe,
.remove = lm90_remove,
.alert = lm90_alert,
.id_table = lm90_id,
.detect = lm90_detect,
.address_list = normal_i2c,
};
module_i2c_driver(lm90_driver);
MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("LM90/ADM1032 driver");
MODULE_LICENSE("GPL");
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