hwmon: LM95245 driver
A hwmon driver for the National Semiconductor LM95245 dual temperature sensors chip. Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Alexander Stein
Guenter Roeck
parent
2ef017935d
commit
fffd80ccc1
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@ -0,0 +1,33 @@
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Kernel driver lm95245
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==================
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Supported chips:
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* National Semiconductor LM95245
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Addresses scanned: I2C 0x18, 0x19, 0x29, 0x4c, 0x4d
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Datasheet: Publicly available at the National Semiconductor website
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http://www.national.com/mpf/LM/LM95245.html
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Author: Alexander Stein <alexander.stein@systec-electronic.com>
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Description
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-----------
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The LM95245 is an 11-bit digital temperature sensor with a 2-wire System
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Management Bus (SMBus) interface and TruTherm technology that can monitor
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the temperature of a remote diode as well as its own temperature.
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The LM95245 can be used to very accurately monitor the temperature of
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external devices such as microprocessors.
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All temperature values are given in millidegrees Celsius. Local temperature
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is given within a range of -127 to +127.875 degrees. Remote temperatures are
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given within a range of -127 to +255 degrees. Resolution depends on
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temperature input and range.
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Each sensor has its own critical limit, but the hysteresis is common to all
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two channels.
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The lm95245 driver can change its update interval to a fixed set of values.
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It will round up to the next selectable interval. See the datasheet for exact
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values. Reading sensor values more often will do no harm, but will return
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'old' values.
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@ -702,6 +702,15 @@ config SENSORS_LM95241
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This driver can also be built as a module. If so, the module
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will be called lm95241.
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config SENSORS_LM95245
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tristate "National Semiconductor LM95245 sensor chip"
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depends on I2C && EXPERIMENTAL
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help
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If you say yes here you get support for LM95245 sensor chip.
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This driver can also be built as a module. If so, the module
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will be called lm95245.
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config SENSORS_MAX1111
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tristate "Maxim MAX1111 Multichannel, Serial 8-bit ADC chip"
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depends on SPI_MASTER
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@ -80,6 +80,7 @@ obj-$(CONFIG_SENSORS_LM90) += lm90.o
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obj-$(CONFIG_SENSORS_LM92) += lm92.o
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obj-$(CONFIG_SENSORS_LM93) += lm93.o
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obj-$(CONFIG_SENSORS_LM95241) += lm95241.o
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obj-$(CONFIG_SENSORS_LM95245) += lm95245.o
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obj-$(CONFIG_SENSORS_LTC4151) += ltc4151.o
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obj-$(CONFIG_SENSORS_LTC4215) += ltc4215.o
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obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o
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@ -0,0 +1,543 @@
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/*
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* Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
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*
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* The LM95245 is a sensor chip made by National Semiconductors.
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* It reports up to two temperatures (its own plus an external one).
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* Complete datasheet can be obtained from National's website at:
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* http://www.national.com/ds.cgi/LM/LM95245.pdf
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*
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* This driver is based on lm95241.c
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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.h>
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#include <linux/hwmon-sysfs.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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#define DEVNAME "lm95245"
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static const unsigned short normal_i2c[] = {
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0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
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/* LM95245 registers */
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/* general registers */
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#define LM95245_REG_RW_CONFIG1 0x03
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#define LM95245_REG_RW_CONVERS_RATE 0x04
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#define LM95245_REG_W_ONE_SHOT 0x0F
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/* diode configuration */
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#define LM95245_REG_RW_CONFIG2 0xBF
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#define LM95245_REG_RW_REMOTE_OFFH 0x11
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#define LM95245_REG_RW_REMOTE_OFFL 0x12
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/* status registers */
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#define LM95245_REG_R_STATUS1 0x02
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#define LM95245_REG_R_STATUS2 0x33
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/* limit registers */
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#define LM95245_REG_RW_REMOTE_OS_LIMIT 0x07
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#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT 0x20
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#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT 0x19
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#define LM95245_REG_RW_COMMON_HYSTERESIS 0x21
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/* temperature signed */
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#define LM95245_REG_R_LOCAL_TEMPH_S 0x00
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#define LM95245_REG_R_LOCAL_TEMPL_S 0x30
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#define LM95245_REG_R_REMOTE_TEMPH_S 0x01
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#define LM95245_REG_R_REMOTE_TEMPL_S 0x10
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/* temperature unsigned */
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#define LM95245_REG_R_REMOTE_TEMPH_U 0x31
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#define LM95245_REG_R_REMOTE_TEMPL_U 0x32
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/* id registers */
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#define LM95245_REG_R_MAN_ID 0xFE
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#define LM95245_REG_R_CHIP_ID 0xFF
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/* LM95245 specific bitfields */
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#define CFG_STOP 0x40
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#define CFG_REMOTE_TCRIT_MASK 0x10
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#define CFG_REMOTE_OS_MASK 0x08
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#define CFG_LOCAL_TCRIT_MASK 0x04
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#define CFG_LOCAL_OS_MASK 0x02
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#define CFG2_OS_A0 0x40
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#define CFG2_DIODE_FAULT_OS 0x20
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#define CFG2_DIODE_FAULT_TCRIT 0x10
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#define CFG2_REMOTE_TT 0x08
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#define CFG2_REMOTE_FILTER_DIS 0x00
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#define CFG2_REMOTE_FILTER_EN 0x06
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/* conversation rate in ms */
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#define RATE_CR0063 0x00
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#define RATE_CR0364 0x01
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#define RATE_CR1000 0x02
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#define RATE_CR2500 0x03
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#define STATUS1_DIODE_FAULT 0x04
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#define STATUS1_RTCRIT 0x02
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#define STATUS1_LOC 0x01
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#define MANUFACTURER_ID 0x01
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#define DEFAULT_REVISION 0xB3
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static const u8 lm95245_reg_address[] = {
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LM95245_REG_R_LOCAL_TEMPH_S,
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LM95245_REG_R_LOCAL_TEMPL_S,
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LM95245_REG_R_REMOTE_TEMPH_S,
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LM95245_REG_R_REMOTE_TEMPL_S,
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LM95245_REG_R_REMOTE_TEMPH_U,
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LM95245_REG_R_REMOTE_TEMPL_U,
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LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
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LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
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LM95245_REG_RW_COMMON_HYSTERESIS,
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LM95245_REG_R_STATUS1,
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};
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/* Client data (each client gets its own) */
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struct lm95245_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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unsigned long last_updated; /* in jiffies */
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unsigned long interval; /* in msecs */
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bool valid; /* zero until following fields are valid */
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/* registers values */
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u8 regs[ARRAY_SIZE(lm95245_reg_address)];
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u8 config1, config2;
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};
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/* Conversions */
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static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
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{
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return val_h * 1000 + val_l * 1000 / 256;
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}
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static int temp_from_reg_signed(u8 val_h, u8 val_l)
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{
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if (val_h & 0x80)
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return (val_h - 0x100) * 1000;
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return temp_from_reg_unsigned(val_h, val_l);
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}
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static struct lm95245_data *lm95245_update_device(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95245_data *data = i2c_get_clientdata(client);
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated
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+ msecs_to_jiffies(data->interval)) || !data->valid) {
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int i;
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dev_dbg(&client->dev, "Updating lm95245 data.\n");
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for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++)
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data->regs[i]
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= i2c_smbus_read_byte_data(client,
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lm95245_reg_address[i]);
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data->last_updated = jiffies;
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data->valid = 1;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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static unsigned long lm95245_read_conversion_rate(struct i2c_client *client)
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{
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int rate;
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unsigned long interval;
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rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE);
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switch (rate) {
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case RATE_CR0063:
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interval = 63;
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break;
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case RATE_CR0364:
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interval = 364;
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break;
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case RATE_CR1000:
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interval = 1000;
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break;
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case RATE_CR2500:
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default:
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interval = 2500;
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break;
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}
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return interval;
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}
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static unsigned long lm95245_set_conversion_rate(struct i2c_client *client,
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unsigned long interval)
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{
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int rate;
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if (interval <= 63) {
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interval = 63;
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rate = RATE_CR0063;
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} else if (interval <= 364) {
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interval = 364;
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rate = RATE_CR0364;
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} else if (interval <= 1000) {
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interval = 1000;
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rate = RATE_CR1000;
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} else {
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interval = 2500;
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rate = RATE_CR2500;
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}
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i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate);
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return interval;
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}
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/* Sysfs stuff */
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static ssize_t show_input(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct lm95245_data *data = lm95245_update_device(dev);
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int temp;
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int index = to_sensor_dev_attr(attr)->index;
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/*
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* Index 0 (Local temp) is always signed
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* Index 2 (Remote temp) has both signed and unsigned data
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* use signed calculation for remote if signed bit is set
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*/
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if (index == 0 || data->regs[index] & 0x80)
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temp = temp_from_reg_signed(data->regs[index],
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data->regs[index + 1]);
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else
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temp = temp_from_reg_unsigned(data->regs[index + 2],
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data->regs[index + 3]);
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return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp);
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}
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static ssize_t show_limit(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct lm95245_data *data = lm95245_update_device(dev);
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int index = to_sensor_dev_attr(attr)->index;
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return snprintf(buf, PAGE_SIZE - 1, "%d\n",
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data->regs[index] * 1000);
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}
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static ssize_t set_limit(struct device *dev, struct device_attribute *attr,
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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 lm95245_data *data = i2c_get_clientdata(client);
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int index = to_sensor_dev_attr(attr)->index;
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unsigned long val;
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if (strict_strtoul(buf, 10, &val) < 0)
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return -EINVAL;
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val /= 1000;
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val = SENSORS_LIMIT(val, 0, (index == 6 ? 127 : 255));
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mutex_lock(&data->update_lock);
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data->valid = 0;
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i2c_smbus_write_byte_data(client, lm95245_reg_address[index], val);
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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 set_crit_hyst(struct device *dev, struct device_attribute *attr,
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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 lm95245_data *data = i2c_get_clientdata(client);
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unsigned long val;
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if (strict_strtoul(buf, 10, &val) < 0)
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return -EINVAL;
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val /= 1000;
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val = SENSORS_LIMIT(val, 0, 31);
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mutex_lock(&data->update_lock);
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data->valid = 0;
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/* shared crit hysteresis */
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i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS,
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val);
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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_type(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm95245_data *data = i2c_get_clientdata(client);
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return snprintf(buf, PAGE_SIZE - 1,
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data->config2 & CFG2_REMOTE_TT ? "1\n" : "2\n");
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}
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static ssize_t set_type(struct device *dev, struct device_attribute *attr,
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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 lm95245_data *data = i2c_get_clientdata(client);
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unsigned long val;
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if (strict_strtoul(buf, 10, &val) < 0)
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return -EINVAL;
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if (val != 1 && val != 2)
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return -EINVAL;
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mutex_lock(&data->update_lock);
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if (val == 1)
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data->config2 |= CFG2_REMOTE_TT;
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else
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data->config2 &= ~CFG2_REMOTE_TT;
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data->valid = 0;
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i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2,
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data->config2);
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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_alarm(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct lm95245_data *data = lm95245_update_device(dev);
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int index = to_sensor_dev_attr(attr)->index;
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return snprintf(buf, PAGE_SIZE - 1, "%d\n",
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!!(data->regs[9] & index));
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}
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static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct lm95245_data *data = lm95245_update_device(dev);
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return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
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}
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static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
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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 lm95245_data *data = i2c_get_clientdata(client);
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unsigned long val;
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if (strict_strtoul(buf, 10, &val) < 0)
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return -EINVAL;
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mutex_lock(&data->update_lock);
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data->interval = lm95245_set_conversion_rate(client, val);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_limit,
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set_limit, 6);
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static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_limit,
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set_crit_hyst, 8);
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static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
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STATUS1_LOC);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_limit,
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set_limit, 7);
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static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_limit,
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set_crit_hyst, 8);
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static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
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||||
STATUS1_RTCRIT);
|
||||
static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type,
|
||||
set_type, 0);
|
||||
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
|
||||
STATUS1_DIODE_FAULT);
|
||||
|
||||
static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
|
||||
set_interval);
|
||||
|
||||
static struct attribute *lm95245_attributes[] = {
|
||||
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
||||
&sensor_dev_attr_temp1_crit.dev_attr.attr,
|
||||
&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
|
||||
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
|
||||
&sensor_dev_attr_temp2_input.dev_attr.attr,
|
||||
&sensor_dev_attr_temp2_crit.dev_attr.attr,
|
||||
&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
|
||||
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
|
||||
&sensor_dev_attr_temp2_type.dev_attr.attr,
|
||||
&sensor_dev_attr_temp2_fault.dev_attr.attr,
|
||||
&dev_attr_update_interval.attr,
|
||||
NULL
|
||||
};
|
||||
|
||||
static const struct attribute_group lm95245_group = {
|
||||
.attrs = lm95245_attributes,
|
||||
};
|
||||
|
||||
/* Return 0 if detection is successful, -ENODEV otherwise */
|
||||
static int lm95245_detect(struct i2c_client *new_client,
|
||||
struct i2c_board_info *info)
|
||||
{
|
||||
struct i2c_adapter *adapter = new_client->adapter;
|
||||
|
||||
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
||||
return -ENODEV;
|
||||
|
||||
if (i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID)
|
||||
!= MANUFACTURER_ID
|
||||
|| i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID)
|
||||
!= DEFAULT_REVISION)
|
||||
return -ENODEV;
|
||||
|
||||
strlcpy(info->type, DEVNAME, I2C_NAME_SIZE);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void lm95245_init_client(struct i2c_client *client)
|
||||
{
|
||||
struct lm95245_data *data = i2c_get_clientdata(client);
|
||||
|
||||
data->valid = 0;
|
||||
data->interval = lm95245_read_conversion_rate(client);
|
||||
|
||||
data->config1 = i2c_smbus_read_byte_data(client,
|
||||
LM95245_REG_RW_CONFIG1);
|
||||
data->config2 = i2c_smbus_read_byte_data(client,
|
||||
LM95245_REG_RW_CONFIG2);
|
||||
|
||||
if (data->config1 & CFG_STOP) {
|
||||
/* Clear the standby bit */
|
||||
data->config1 &= ~CFG_STOP;
|
||||
i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1,
|
||||
data->config1);
|
||||
}
|
||||
}
|
||||
|
||||
static int lm95245_probe(struct i2c_client *new_client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct lm95245_data *data;
|
||||
int err;
|
||||
|
||||
data = kzalloc(sizeof(struct lm95245_data), GFP_KERNEL);
|
||||
if (!data) {
|
||||
err = -ENOMEM;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
i2c_set_clientdata(new_client, data);
|
||||
mutex_init(&data->update_lock);
|
||||
|
||||
/* Initialize the LM95245 chip */
|
||||
lm95245_init_client(new_client);
|
||||
|
||||
/* Register sysfs hooks */
|
||||
err = sysfs_create_group(&new_client->dev.kobj, &lm95245_group);
|
||||
if (err)
|
||||
goto exit_free;
|
||||
|
||||
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, &lm95245_group);
|
||||
exit_free:
|
||||
kfree(data);
|
||||
exit:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int lm95245_remove(struct i2c_client *client)
|
||||
{
|
||||
struct lm95245_data *data = i2c_get_clientdata(client);
|
||||
|
||||
hwmon_device_unregister(data->hwmon_dev);
|
||||
sysfs_remove_group(&client->dev.kobj, &lm95245_group);
|
||||
|
||||
kfree(data);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Driver data (common to all clients) */
|
||||
static const struct i2c_device_id lm95245_id[] = {
|
||||
{ DEVNAME, 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, lm95245_id);
|
||||
|
||||
static struct i2c_driver lm95245_driver = {
|
||||
.class = I2C_CLASS_HWMON,
|
||||
.driver = {
|
||||
.name = DEVNAME,
|
||||
},
|
||||
.probe = lm95245_probe,
|
||||
.remove = lm95245_remove,
|
||||
.id_table = lm95245_id,
|
||||
.detect = lm95245_detect,
|
||||
.address_list = normal_i2c,
|
||||
};
|
||||
|
||||
static int __init sensors_lm95245_init(void)
|
||||
{
|
||||
return i2c_add_driver(&lm95245_driver);
|
||||
}
|
||||
|
||||
static void __exit sensors_lm95245_exit(void)
|
||||
{
|
||||
i2c_del_driver(&lm95245_driver);
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
|
||||
MODULE_DESCRIPTION("LM95245 sensor driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
module_init(sensors_lm95245_init);
|
||||
module_exit(sensors_lm95245_exit);
|
||||
Loading…
Reference in New Issue