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1035 lines
30 KiB
1035 lines
30 KiB
/*
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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) 2003-2008 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.
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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.
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* Note that there is no way to differentiate between both chips.
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* When device is auto-detected, the driver will assume an LM99.
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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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*
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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. Among others, it has a higher
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* accuracy than the LM90, much like the 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.
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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 MAX6646, MAX6647, MAX6648, MAX6649 and
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* MAX6692 chips made by Maxim. These are again similar to the LM86,
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* but they use unsigned temperature values and can report temperatures
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* from 0 to 145 degrees.
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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. The MAX6680 and MAX6681 only differ in the pinout so they can
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* be treated identically.
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*
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* This driver also supports the ADT7461 chip from Analog Devices.
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* It's supported in both compatibility and extended mode. It is mostly
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* compatible with LM90 except for a data format difference for the
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* temperature value registers.
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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, MAX6649, MAX6657
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* and MAX6658 have address 0x4c.
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* ADM1032-2, ADT7461-2, LM89-1, LM99-1 and MAX6646 have address 0x4d.
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* MAX6647 has address 0x4e.
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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_8(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680,
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max6646);
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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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/* MAX6646/6647/6649/6657/6658/6659 registers */
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#define MAX6657_REG_R_LOCAL_TEMPL 0x11
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/*
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* Device flags
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*/
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#define LM90_FLAG_ADT7461_EXT 0x01 /* ADT7461 extended mode */
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/*
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* Functions declaration
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*/
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static int lm90_detect(struct i2c_client *client, int kind,
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struct i2c_board_info *info);
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static int lm90_probe(struct i2c_client *client,
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const struct i2c_device_id *id);
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static void lm90_init_client(struct i2c_client *client);
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static int lm90_remove(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 const struct i2c_device_id lm90_id[] = {
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{ "adm1032", adm1032 },
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{ "adt7461", adt7461 },
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{ "lm90", lm90 },
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{ "lm86", lm86 },
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{ "lm89", lm86 },
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{ "lm99", lm99 },
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{ "max6646", max6646 },
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{ "max6647", max6646 },
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{ "max6649", max6646 },
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{ "max6657", max6657 },
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{ "max6658", max6657 },
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{ "max6659", max6657 },
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{ "max6680", max6680 },
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{ "max6681", max6680 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lm90_id);
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static struct i2c_driver lm90_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "lm90",
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},
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.probe = lm90_probe,
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.remove = lm90_remove,
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.id_table = lm90_id,
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.detect = lm90_detect,
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.address_data = &addr_data,
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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 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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int flags;
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/* registers values */
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s8 temp8[4]; /* 0: local low limit
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1: local high limit
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2: local critical limit
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3: remote critical limit */
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s16 temp11[5]; /* 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 max6646 and max6657)
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4: local input */
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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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* Conversions
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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. Some
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* Maxim chips use unsigned values.
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*/
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static inline int temp_from_s8(s8 val)
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{
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return val * 1000;
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}
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static inline int temp_from_u8(u8 val)
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{
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return val * 1000;
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}
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static inline int temp_from_s16(s16 val)
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{
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return val / 32 * 125;
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}
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static inline int temp_from_u16(u16 val)
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{
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return val / 32 * 125;
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}
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static s8 temp_to_s8(long val)
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{
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if (val <= -128000)
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return -128;
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if (val >= 127000)
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return 127;
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if (val < 0)
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return (val - 500) / 1000;
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return (val + 500) / 1000;
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}
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static u8 temp_to_u8(long val)
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{
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if (val <= 0)
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return 0;
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if (val >= 255000)
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return 255;
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return (val + 500) / 1000;
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}
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static s16 temp_to_s16(long val)
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{
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if (val <= -128000)
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return 0x8000;
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if (val >= 127875)
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return 0x7FE0;
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if (val < 0)
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return (val - 62) / 125 * 32;
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return (val + 62) / 125 * 32;
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}
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static u8 hyst_to_reg(long val)
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{
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if (val <= 0)
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return 0;
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if (val >= 30500)
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return 31;
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return (val + 500) / 1000;
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}
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/*
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* ADT7461 in compatibility mode is almost identical to LM90 except that
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* attempts to write values that are outside the range 0 < temp < 127 are
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* treated as the boundary value.
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*
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* ADT7461 in "extended mode" operation uses unsigned integers offset by
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* 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC.
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*/
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static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val)
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{
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if (data->flags & LM90_FLAG_ADT7461_EXT)
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return (val - 64) * 1000;
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else
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return temp_from_s8(val);
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}
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static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val)
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{
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if (data->flags & LM90_FLAG_ADT7461_EXT)
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return (val - 0x4000) / 64 * 250;
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else
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return temp_from_s16(val);
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}
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static u8 temp_to_u8_adt7461(struct lm90_data *data, long val)
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{
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if (data->flags & LM90_FLAG_ADT7461_EXT) {
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if (val <= -64000)
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return 0;
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if (val >= 191000)
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return 0xFF;
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return (val + 500 + 64000) / 1000;
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} else {
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if (val <= 0)
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return 0;
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if (val >= 127000)
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return 127;
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return (val + 500) / 1000;
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}
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}
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static u16 temp_to_u16_adt7461(struct lm90_data *data, long val)
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{
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if (data->flags & LM90_FLAG_ADT7461_EXT) {
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if (val <= -64000)
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return 0;
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if (val >= 191750)
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return 0xFFC0;
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return (val + 64000 + 125) / 250 * 64;
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} else {
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if (val <= 0)
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return 0;
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if (val >= 127750)
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return 0x7FC0;
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return (val + 125) / 250 * 64;
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}
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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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int temp;
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if (data->kind == adt7461)
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temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
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else if (data->kind == max6646)
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temp = temp_from_u8(data->temp8[attr->index]);
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else
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temp = temp_from_s8(data->temp8[attr->index]);
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/* +16 degrees offset for temp2 for the LM99 */
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if (data->kind == lm99 && attr->index == 3)
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temp += 16000;
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return sprintf(buf, "%d\n", temp);
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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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|
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/* +16 degrees offset for temp2 for the LM99 */
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if (data->kind == lm99 && attr->index == 3)
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val -= 16000;
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|
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mutex_lock(&data->update_lock);
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if (data->kind == adt7461)
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data->temp8[nr] = temp_to_u8_adt7461(data, val);
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else if (data->kind == max6646)
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data->temp8[nr] = temp_to_u8(val);
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else
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data->temp8[nr] = temp_to_s8(val);
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i2c_smbus_write_byte_data(client, reg[nr], 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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|
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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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int temp;
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|
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if (data->kind == adt7461)
|
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temp = temp_from_u16_adt7461(data, data->temp11[attr->index]);
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else if (data->kind == max6646)
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temp = temp_from_u16(data->temp11[attr->index]);
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else
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temp = temp_from_s16(data->temp11[attr->index]);
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|
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/* +16 degrees offset for temp2 for the LM99 */
|
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if (data->kind == lm99 && attr->index <= 2)
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temp += 16000;
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|
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return sprintf(buf, "%d\n", temp);
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}
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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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|
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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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|
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/* +16 degrees offset for temp2 for the LM99 */
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if (data->kind == lm99 && attr->index <= 2)
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val -= 16000;
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|
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mutex_lock(&data->update_lock);
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if (data->kind == adt7461)
|
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data->temp11[nr] = temp_to_u16_adt7461(data, val);
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else if (data->kind == max6657 || data->kind == max6680)
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data->temp11[nr] = temp_to_s8(val) << 8;
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else if (data->kind == max6646)
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data->temp11[nr] = temp_to_u8(val) << 8;
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else
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data->temp11[nr] = temp_to_s16(val);
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|
|
i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
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data->temp11[nr] >> 8);
|
|
if (data->kind != max6657 && data->kind != max6680
|
|
&& data->kind != max6646)
|
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i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
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data->temp11[nr] & 0xff);
|
|
mutex_unlock(&data->update_lock);
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|
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 = simple_strtol(buf, NULL, 10);
|
|
int temp;
|
|
|
|
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 SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp11, NULL, 4);
|
|
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
|
|
set_temp8, 0);
|
|
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
|
|
set_temp11, 1);
|
|
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
|
|
set_temp8, 1);
|
|
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
|
|
set_temp11, 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(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
|
|
set_temp11, 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 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,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group lm90_group = {
|
|
.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;
|
|
}
|
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */
|
|
static int lm90_detect(struct i2c_client *new_client, int kind,
|
|
struct i2c_board_info *info)
|
|
{
|
|
struct i2c_adapter *adapter = new_client->adapter;
|
|
int address = new_client->addr;
|
|
const char *name = "";
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* 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)
|
|
return -ENODEV;
|
|
|
|
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)
|
|
return -ENODEV;
|
|
|
|
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;
|
|
dev_info(&adapter->dev,
|
|
"Assuming LM99 chip at "
|
|
"0x%02x\n", address);
|
|
dev_info(&adapter->dev,
|
|
"If it is an LM89, pass "
|
|
"force_lm86=%d,0x%02x when "
|
|
"loading the lm90 driver\n",
|
|
i2c_adapter_id(adapter),
|
|
address);
|
|
} 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 & 0x1B) == 0x00
|
|
&& 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;
|
|
} 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
|
|
&& (reg_config1 & 0x3f) == 0x00
|
|
&& reg_convrate <= 0x07) {
|
|
kind = max6646;
|
|
}
|
|
}
|
|
|
|
if (kind <= 0) { /* 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;
|
|
}
|
|
}
|
|
|
|
/* Fill the i2c board info */
|
|
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))
|
|
info->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";
|
|
} else if (kind == max6646) {
|
|
name = "max6646";
|
|
}
|
|
strlcpy(info->type, name, I2C_NAME_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lm90_probe(struct i2c_client *new_client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct i2c_adapter *adapter = to_i2c_adapter(new_client->dev.parent);
|
|
struct lm90_data *data;
|
|
int err;
|
|
|
|
data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL);
|
|
if (!data) {
|
|
err = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
i2c_set_clientdata(new_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))
|
|
new_client->flags &= ~I2C_CLIENT_PEC;
|
|
}
|
|
|
|
/* 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_free;
|
|
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 && data->kind != max6646) {
|
|
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_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;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
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_remove(struct i2c_client *client)
|
|
{
|
|
struct lm90_data *data = i2c_get_clientdata(client);
|
|
|
|
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 && data->kind != max6646)
|
|
device_remove_file(&client->dev,
|
|
&sensor_dev_attr_temp2_offset.dev_attr);
|
|
|
|
kfree(data);
|
|
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
|
|
* 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 ((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;
|
|
}
|
|
|
|
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 h, l;
|
|
|
|
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->kind == max6657 || data->kind == max6646) {
|
|
lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
|
|
MAX6657_REG_R_LOCAL_TEMPL,
|
|
&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->kind != max6657 && data->kind != max6680
|
|
&& data->kind != max6646
|
|
&& 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->kind != max6657 && data->kind != max6680
|
|
&& data->kind != max6646
|
|
&& lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
|
|
&l) == 0)
|
|
data->temp11[2] |= l;
|
|
}
|
|
|
|
if (data->kind != max6657 && data->kind != max6646) {
|
|
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;
|
|
}
|
|
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);
|
|
|