810 lines
26 KiB
C
810 lines
26 KiB
C
/*
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* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (C) 2003-2006 Jean Delvare <khali@linux-fr.org>
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*
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* Based on the lm83 driver. The LM90 is a sensor chip made by National
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* Semiconductor. It reports up to two temperatures (its own plus up to
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* one external one) with a 0.125 deg resolution (1 deg for local
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* temperature) and a 3-4 deg accuracy. Complete datasheet can be
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* obtained from National's website at:
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* http://www.national.com/pf/LM/LM90.html
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*
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* This driver also supports the LM89 and LM99, two other sensor chips
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* made by National Semiconductor. Both have an increased remote
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* temperature measurement accuracy (1 degree), and the LM99
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* additionally shifts remote temperatures (measured and limits) by 16
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* degrees, which allows for higher temperatures measurement. The
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* driver doesn't handle it since it can be done easily in user-space.
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* Complete datasheets can be obtained from National's website at:
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* http://www.national.com/pf/LM/LM89.html
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* http://www.national.com/pf/LM/LM99.html
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* Note that there is no way to differentiate between both chips.
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*
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* This driver also supports the LM86, another sensor chip made by
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* National Semiconductor. It is exactly similar to the LM90 except it
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* has a higher accuracy.
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* Complete datasheet can be obtained from National's website at:
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* http://www.national.com/pf/LM/LM86.html
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*
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* This driver also supports the ADM1032, a sensor chip made by Analog
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* Devices. That chip is similar to the LM90, with a few differences
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* that are not handled by this driver. Complete datasheet can be
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* obtained from Analog's website at:
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* http://www.analog.com/en/prod/0,2877,ADM1032,00.html
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* Among others, it has a higher accuracy than the LM90, much like the
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* LM86 does.
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*
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* This driver also supports the MAX6657, MAX6658 and MAX6659 sensor
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* chips made by Maxim. These chips are similar to the LM86. Complete
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* datasheet can be obtained at Maxim's website at:
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* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
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* Note that there is no easy way to differentiate between the three
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* variants. The extra address and features of the MAX6659 are not
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* supported by this driver. These chips lack the remote temperature
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* offset feature.
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*
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* This driver also supports the MAX6680 and MAX6681, two other sensor
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* chips made by Maxim. These are quite similar to the other Maxim
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* chips. Complete datasheet can be obtained at:
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* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3370
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* The MAX6680 and MAX6681 only differ in the pinout so they can be
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* treated identically.
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*
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* This driver also supports the ADT7461 chip from Analog Devices but
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* only in its "compatability mode". If an ADT7461 chip is found but
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* is configured in non-compatible mode (where its temperature
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* register values are decoded differently) it is ignored by this
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* driver. Complete datasheet can be obtained from Analog's website
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* at:
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* http://www.analog.com/en/prod/0,2877,ADT7461,00.html
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*
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* Since the LM90 was the first chipset supported by this driver, most
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* comments will refer to this chipset, but are actually general and
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* concern all supported chipsets, unless mentioned otherwise.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/hwmon.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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/*
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* Addresses to scan
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* Address is fully defined internally and cannot be changed except for
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* MAX6659, MAX6680 and MAX6681.
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* LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6657 and MAX6658
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* have address 0x4c.
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* ADM1032-2, ADT7461-2, LM89-1, and LM99-1 have address 0x4d.
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* MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported).
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* MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
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* 0x4c, 0x4d or 0x4e.
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*/
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static const unsigned short normal_i2c[] = {
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0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
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/*
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* Insmod parameters
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*/
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I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680);
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/*
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* The LM90 registers
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*/
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#define LM90_REG_R_MAN_ID 0xFE
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#define LM90_REG_R_CHIP_ID 0xFF
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#define LM90_REG_R_CONFIG1 0x03
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#define LM90_REG_W_CONFIG1 0x09
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#define LM90_REG_R_CONFIG2 0xBF
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#define LM90_REG_W_CONFIG2 0xBF
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#define LM90_REG_R_CONVRATE 0x04
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#define LM90_REG_W_CONVRATE 0x0A
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#define LM90_REG_R_STATUS 0x02
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#define LM90_REG_R_LOCAL_TEMP 0x00
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#define LM90_REG_R_LOCAL_HIGH 0x05
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#define LM90_REG_W_LOCAL_HIGH 0x0B
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#define LM90_REG_R_LOCAL_LOW 0x06
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#define LM90_REG_W_LOCAL_LOW 0x0C
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#define LM90_REG_R_LOCAL_CRIT 0x20
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#define LM90_REG_W_LOCAL_CRIT 0x20
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#define LM90_REG_R_REMOTE_TEMPH 0x01
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#define LM90_REG_R_REMOTE_TEMPL 0x10
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#define LM90_REG_R_REMOTE_OFFSH 0x11
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#define LM90_REG_W_REMOTE_OFFSH 0x11
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#define LM90_REG_R_REMOTE_OFFSL 0x12
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#define LM90_REG_W_REMOTE_OFFSL 0x12
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#define LM90_REG_R_REMOTE_HIGHH 0x07
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#define LM90_REG_W_REMOTE_HIGHH 0x0D
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#define LM90_REG_R_REMOTE_HIGHL 0x13
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#define LM90_REG_W_REMOTE_HIGHL 0x13
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#define LM90_REG_R_REMOTE_LOWH 0x08
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#define LM90_REG_W_REMOTE_LOWH 0x0E
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#define LM90_REG_R_REMOTE_LOWL 0x14
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#define LM90_REG_W_REMOTE_LOWL 0x14
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#define LM90_REG_R_REMOTE_CRIT 0x19
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#define LM90_REG_W_REMOTE_CRIT 0x19
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#define LM90_REG_R_TCRIT_HYST 0x21
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#define LM90_REG_W_TCRIT_HYST 0x21
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/*
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* Conversions and various macros
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* For local temperatures and limits, critical limits and the hysteresis
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* value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
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* For remote temperatures and limits, it uses signed 11-bit values with
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* LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
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*/
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#define TEMP1_FROM_REG(val) ((val) * 1000)
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#define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \
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(val) >= 127000 ? 127 : \
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(val) < 0 ? ((val) - 500) / 1000 : \
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((val) + 500) / 1000)
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#define TEMP2_FROM_REG(val) ((val) / 32 * 125)
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#define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \
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(val) >= 127875 ? 0x7FE0 : \
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(val) < 0 ? ((val) - 62) / 125 * 32 : \
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((val) + 62) / 125 * 32)
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#define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \
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((val) + 500) / 1000)
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/*
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* ADT7461 is almost identical to LM90 except that attempts to write
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* values that are outside the range 0 < temp < 127 are treated as
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* the boundary value.
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*/
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#define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
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(val) >= 127000 ? 127 : \
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((val) + 500) / 1000)
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#define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
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(val) >= 127750 ? 0x7FC0 : \
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((val) + 125) / 250 * 64)
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/*
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* Functions declaration
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*/
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static int lm90_attach_adapter(struct i2c_adapter *adapter);
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static int lm90_detect(struct i2c_adapter *adapter, int address,
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int kind);
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static void lm90_init_client(struct i2c_client *client);
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static int lm90_detach_client(struct i2c_client *client);
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static struct lm90_data *lm90_update_device(struct device *dev);
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/*
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* Driver data (common to all clients)
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*/
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static struct i2c_driver lm90_driver = {
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.driver = {
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.name = "lm90",
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},
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.attach_adapter = lm90_attach_adapter,
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.detach_client = lm90_detach_client,
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};
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/*
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* Client data (each client gets its own)
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*/
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struct lm90_data {
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struct i2c_client client;
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struct device *hwmon_dev;
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struct mutex update_lock;
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char valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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int kind;
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/* registers values */
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s8 temp8[5]; /* 0: local input
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1: local low limit
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2: local high limit
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3: local critical limit
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4: remote critical limit */
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s16 temp11[4]; /* 0: remote input
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1: remote low limit
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2: remote high limit
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3: remote offset (except max6657) */
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u8 temp_hyst;
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u8 alarms; /* bitvector */
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};
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/*
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* Sysfs stuff
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*/
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static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct lm90_data *data = lm90_update_device(dev);
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return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]));
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}
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static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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static const u8 reg[4] = {
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LM90_REG_W_LOCAL_LOW,
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LM90_REG_W_LOCAL_HIGH,
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LM90_REG_W_LOCAL_CRIT,
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LM90_REG_W_REMOTE_CRIT,
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};
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i2c_client *client = to_i2c_client(dev);
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struct lm90_data *data = i2c_get_clientdata(client);
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long val = simple_strtol(buf, NULL, 10);
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int nr = attr->index;
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mutex_lock(&data->update_lock);
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if (data->kind == adt7461)
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data->temp8[nr] = TEMP1_TO_REG_ADT7461(val);
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else
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data->temp8[nr] = TEMP1_TO_REG(val);
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i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct lm90_data *data = lm90_update_device(dev);
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return sprintf(buf, "%d\n", TEMP2_FROM_REG(data->temp11[attr->index]));
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}
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static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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static const u8 reg[6] = {
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LM90_REG_W_REMOTE_LOWH,
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LM90_REG_W_REMOTE_LOWL,
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LM90_REG_W_REMOTE_HIGHH,
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LM90_REG_W_REMOTE_HIGHL,
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LM90_REG_W_REMOTE_OFFSH,
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LM90_REG_W_REMOTE_OFFSL,
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};
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct i2c_client *client = to_i2c_client(dev);
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struct lm90_data *data = i2c_get_clientdata(client);
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long val = simple_strtol(buf, NULL, 10);
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int nr = attr->index;
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mutex_lock(&data->update_lock);
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if (data->kind == adt7461)
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data->temp11[nr] = TEMP2_TO_REG_ADT7461(val);
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else
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data->temp11[nr] = TEMP2_TO_REG(val);
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i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
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data->temp11[nr] >> 8);
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i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
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data->temp11[nr] & 0xff);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct lm90_data *data = lm90_update_device(dev);
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return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index])
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- TEMP1_FROM_REG(data->temp_hyst));
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}
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static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm90_data *data = i2c_get_clientdata(client);
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long val = simple_strtol(buf, NULL, 10);
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long hyst;
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mutex_lock(&data->update_lock);
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hyst = TEMP1_FROM_REG(data->temp8[3]) - val;
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i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
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HYST_TO_REG(hyst));
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
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char *buf)
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{
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struct lm90_data *data = lm90_update_device(dev);
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return sprintf(buf, "%d\n", data->alarms);
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}
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static ssize_t show_alarm(struct device *dev, struct device_attribute
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*devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct lm90_data *data = lm90_update_device(dev);
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int bitnr = attr->index;
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return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
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set_temp8, 1);
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static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
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set_temp11, 1);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
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set_temp8, 2);
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static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
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set_temp11, 2);
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static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
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set_temp8, 3);
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static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
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set_temp8, 4);
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static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
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set_temphyst, 3);
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static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4);
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static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
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set_temp11, 3);
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/* Individual alarm files */
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static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
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/* Raw alarm file for compatibility */
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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static struct attribute *lm90_attributes[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp2_min.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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&sensor_dev_attr_temp2_crit.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
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&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_fault.dev_attr.attr,
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&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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&dev_attr_alarms.attr,
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NULL
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};
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static const struct attribute_group lm90_group = {
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.attrs = lm90_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 = simple_strtol(buf, NULL, 10);
|
|
|
|
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
|
|
*/
|
|
|
|
/* 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_attach_adapter(struct i2c_adapter *adapter)
|
|
{
|
|
if (!(adapter->class & I2C_CLASS_HWMON))
|
|
return 0;
|
|
return i2c_probe(adapter, &addr_data, lm90_detect);
|
|
}
|
|
|
|
/*
|
|
* The following function does more than just detection. If detection
|
|
* succeeds, it also registers the new chip.
|
|
*/
|
|
static int lm90_detect(struct i2c_adapter *adapter, int address, int kind)
|
|
{
|
|
struct i2c_client *new_client;
|
|
struct lm90_data *data;
|
|
int err = 0;
|
|
const char *name = "";
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
goto exit;
|
|
|
|
if (!(data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL))) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
/* The common I2C client data is placed right before the
|
|
LM90-specific data. */
|
|
new_client = &data->client;
|
|
i2c_set_clientdata(new_client, data);
|
|
new_client->addr = address;
|
|
new_client->adapter = adapter;
|
|
new_client->driver = &lm90_driver;
|
|
new_client->flags = 0;
|
|
|
|
/*
|
|
* Now we do the remaining detection. A negative kind means that
|
|
* the driver was loaded with no force parameter (default), so we
|
|
* must both detect and identify the chip. A zero kind means that
|
|
* the driver was loaded with the force parameter, the detection
|
|
* step shall be skipped. A positive kind means that the driver
|
|
* was loaded with the force parameter and a given kind of chip is
|
|
* requested, so both the detection and the identification steps
|
|
* are skipped.
|
|
*/
|
|
|
|
/* Default to an LM90 if forced */
|
|
if (kind == 0)
|
|
kind = lm90;
|
|
|
|
if (kind < 0) { /* detection and identification */
|
|
int man_id, chip_id, reg_config1, reg_convrate;
|
|
|
|
if ((man_id = i2c_smbus_read_byte_data(new_client,
|
|
LM90_REG_R_MAN_ID)) < 0
|
|
|| (chip_id = i2c_smbus_read_byte_data(new_client,
|
|
LM90_REG_R_CHIP_ID)) < 0
|
|
|| (reg_config1 = i2c_smbus_read_byte_data(new_client,
|
|
LM90_REG_R_CONFIG1)) < 0
|
|
|| (reg_convrate = i2c_smbus_read_byte_data(new_client,
|
|
LM90_REG_R_CONVRATE)) < 0)
|
|
goto exit_free;
|
|
|
|
if ((address == 0x4C || address == 0x4D)
|
|
&& man_id == 0x01) { /* National Semiconductor */
|
|
int reg_config2;
|
|
|
|
if ((reg_config2 = i2c_smbus_read_byte_data(new_client,
|
|
LM90_REG_R_CONFIG2)) < 0)
|
|
goto exit_free;
|
|
|
|
if ((reg_config1 & 0x2A) == 0x00
|
|
&& (reg_config2 & 0xF8) == 0x00
|
|
&& reg_convrate <= 0x09) {
|
|
if (address == 0x4C
|
|
&& (chip_id & 0xF0) == 0x20) { /* LM90 */
|
|
kind = lm90;
|
|
} else
|
|
if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
|
|
kind = lm99;
|
|
} else
|
|
if (address == 0x4C
|
|
&& (chip_id & 0xF0) == 0x10) { /* LM86 */
|
|
kind = lm86;
|
|
}
|
|
}
|
|
} else
|
|
if ((address == 0x4C || address == 0x4D)
|
|
&& man_id == 0x41) { /* Analog Devices */
|
|
if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
|
|
&& (reg_config1 & 0x3F) == 0x00
|
|
&& reg_convrate <= 0x0A) {
|
|
kind = adm1032;
|
|
} else
|
|
if (chip_id == 0x51 /* ADT7461 */
|
|
&& (reg_config1 & 0x1F) == 0x00 /* check compat mode */
|
|
&& reg_convrate <= 0x0A) {
|
|
kind = adt7461;
|
|
}
|
|
} else
|
|
if (man_id == 0x4D) { /* Maxim */
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (chip_id == man_id
|
|
&& (address == 0x4C || address == 0x4D)
|
|
&& (reg_config1 & 0x1F) == (man_id & 0x0F)
|
|
&& reg_convrate <= 0x09) {
|
|
kind = max6657;
|
|
} 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
|
|
&& (reg_config1 & 0x03) == 0x00
|
|
&& reg_convrate <= 0x07) {
|
|
kind = max6680;
|
|
}
|
|
}
|
|
|
|
if (kind <= 0) { /* identification failed */
|
|
dev_info(&adapter->dev,
|
|
"Unsupported chip (man_id=0x%02X, "
|
|
"chip_id=0x%02X).\n", man_id, chip_id);
|
|
goto exit_free;
|
|
}
|
|
}
|
|
|
|
if (kind == lm90) {
|
|
name = "lm90";
|
|
} else if (kind == adm1032) {
|
|
name = "adm1032";
|
|
/* The ADM1032 supports PEC, but only if combined
|
|
transactions are not used. */
|
|
if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
|
|
new_client->flags |= I2C_CLIENT_PEC;
|
|
} else if (kind == lm99) {
|
|
name = "lm99";
|
|
} else if (kind == lm86) {
|
|
name = "lm86";
|
|
} else if (kind == max6657) {
|
|
name = "max6657";
|
|
} else if (kind == max6680) {
|
|
name = "max6680";
|
|
} else if (kind == adt7461) {
|
|
name = "adt7461";
|
|
}
|
|
|
|
/* We can fill in the remaining client fields */
|
|
strlcpy(new_client->name, name, I2C_NAME_SIZE);
|
|
data->valid = 0;
|
|
data->kind = kind;
|
|
mutex_init(&data->update_lock);
|
|
|
|
/* Tell the I2C layer a new client has arrived */
|
|
if ((err = i2c_attach_client(new_client)))
|
|
goto exit_free;
|
|
|
|
/* Initialize the LM90 chip */
|
|
lm90_init_client(new_client);
|
|
|
|
/* Register sysfs hooks */
|
|
if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group)))
|
|
goto exit_detach;
|
|
if (new_client->flags & I2C_CLIENT_PEC) {
|
|
if ((err = device_create_file(&new_client->dev,
|
|
&dev_attr_pec)))
|
|
goto exit_remove_files;
|
|
}
|
|
if (data->kind != max6657) {
|
|
if ((err = device_create_file(&new_client->dev,
|
|
&sensor_dev_attr_temp2_offset.dev_attr)))
|
|
goto exit_remove_files;
|
|
}
|
|
|
|
data->hwmon_dev = hwmon_device_register(&new_client->dev);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
err = PTR_ERR(data->hwmon_dev);
|
|
goto exit_remove_files;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_remove_files:
|
|
sysfs_remove_group(&new_client->dev.kobj, &lm90_group);
|
|
device_remove_file(&new_client->dev, &dev_attr_pec);
|
|
exit_detach:
|
|
i2c_detach_client(new_client);
|
|
exit_free:
|
|
kfree(data);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static void lm90_init_client(struct i2c_client *client)
|
|
{
|
|
u8 config, config_orig;
|
|
struct lm90_data *data = i2c_get_clientdata(client);
|
|
|
|
/*
|
|
* Start the conversions.
|
|
*/
|
|
i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
|
|
5); /* 2 Hz */
|
|
if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
|
|
dev_warn(&client->dev, "Initialization failed!\n");
|
|
return;
|
|
}
|
|
config_orig = config;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
config &= 0xBF; /* run */
|
|
if (config != config_orig) /* Only write if changed */
|
|
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
|
|
}
|
|
|
|
static int lm90_detach_client(struct i2c_client *client)
|
|
{
|
|
struct lm90_data *data = i2c_get_clientdata(client);
|
|
int err;
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
sysfs_remove_group(&client->dev.kobj, &lm90_group);
|
|
device_remove_file(&client->dev, &dev_attr_pec);
|
|
if (data->kind != max6657)
|
|
device_remove_file(&client->dev,
|
|
&sensor_dev_attr_temp2_offset.dev_attr);
|
|
|
|
if ((err = i2c_detach_client(client)))
|
|
return err;
|
|
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
|
|
u8 oldh, newh, l;
|
|
|
|
dev_dbg(&client->dev, "Updating lm90 data.\n");
|
|
lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, &data->temp8[0]);
|
|
lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[1]);
|
|
lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[2]);
|
|
lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[3]);
|
|
lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[4]);
|
|
lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
|
|
|
|
/*
|
|
* There is a trick here. We have to read two registers to
|
|
* have the remote sensor temperature, but we have to beware
|
|
* a conversion could occur inbetween 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 (lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &oldh) == 0
|
|
&& lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0
|
|
&& lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &newh) == 0
|
|
&& (newh == oldh
|
|
|| lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0))
|
|
data->temp11[0] = (newh << 8) | l;
|
|
|
|
if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &newh) == 0
|
|
&& lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, &l) == 0)
|
|
data->temp11[1] = (newh << 8) | l;
|
|
if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &newh) == 0
|
|
&& lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0)
|
|
data->temp11[2] = (newh << 8) | l;
|
|
if (data->kind != max6657) {
|
|
if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
|
|
&newh) == 0
|
|
&& lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
|
|
&l) == 0)
|
|
data->temp11[3] = (newh << 8) | l;
|
|
}
|
|
lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
static int __init sensors_lm90_init(void)
|
|
{
|
|
return i2c_add_driver(&lm90_driver);
|
|
}
|
|
|
|
static void __exit sensors_lm90_exit(void)
|
|
{
|
|
i2c_del_driver(&lm90_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
|
|
MODULE_DESCRIPTION("LM90/ADM1032 driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(sensors_lm90_init);
|
|
module_exit(sensors_lm90_exit);
|