983b97bed2
This patch brings basic support for the Analog Devices ADT7410 temperature sensor. The following functionality has been implemented: * get current temperature * get/set minimum, maximum and critical temperature * get/set hysteresis * get alarm events for minimum, maximum and critical temperature All implemented sysfs attributes have been sucessfully tested at temperatures of 15°C to 40°C. Signed-off-by: Hartmut Knaack <knaack.h@gmx.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
460 lines
12 KiB
C
460 lines
12 KiB
C
/*
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* adt7410.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* This driver handles the ADT7410 and compatible digital temperature sensors.
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* Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
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* based on lm75.c by Frodo Looijaard <frodol@dds.nl>
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* and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
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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/delay.h>
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/*
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* ADT7410 registers definition
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*/
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#define ADT7410_TEMPERATURE 0
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#define ADT7410_STATUS 2
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#define ADT7410_CONFIG 3
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#define ADT7410_T_ALARM_HIGH 4
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#define ADT7410_T_ALARM_LOW 6
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#define ADT7410_T_CRIT 8
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#define ADT7410_T_HYST 0xA
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/*
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* ADT7410 status
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*/
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#define ADT7410_STAT_T_LOW (1 << 4)
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#define ADT7410_STAT_T_HIGH (1 << 5)
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#define ADT7410_STAT_T_CRIT (1 << 6)
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#define ADT7410_STAT_NOT_RDY (1 << 7)
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/*
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* ADT7410 config
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*/
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#define ADT7410_FAULT_QUEUE_MASK (1 << 0 | 1 << 1)
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#define ADT7410_CT_POLARITY (1 << 2)
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#define ADT7410_INT_POLARITY (1 << 3)
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#define ADT7410_EVENT_MODE (1 << 4)
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#define ADT7410_MODE_MASK (1 << 5 | 1 << 6)
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#define ADT7410_FULL (0 << 5 | 0 << 6)
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#define ADT7410_PD (1 << 5 | 1 << 6)
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#define ADT7410_RESOLUTION (1 << 7)
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/*
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* ADT7410 masks
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*/
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#define ADT7410_T13_VALUE_MASK 0xFFF8
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#define ADT7410_T_HYST_MASK 0xF
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/* straight from the datasheet */
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#define ADT7410_TEMP_MIN (-55000)
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#define ADT7410_TEMP_MAX 150000
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enum adt7410_type { /* keep sorted in alphabetical order */
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adt7410,
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};
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/* Addresses scanned */
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static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
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I2C_CLIENT_END };
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static const u8 ADT7410_REG_TEMP[4] = {
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ADT7410_TEMPERATURE, /* input */
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ADT7410_T_ALARM_HIGH, /* high */
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ADT7410_T_ALARM_LOW, /* low */
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ADT7410_T_CRIT, /* critical */
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};
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/* Each client has this additional data */
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struct adt7410_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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u8 config;
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u8 oldconfig;
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bool valid; /* true if registers valid */
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unsigned long last_updated; /* In jiffies */
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s16 temp[4]; /* Register values,
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0 = input
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1 = high
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2 = low
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3 = critical */
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u8 hyst; /* hysteresis offset */
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};
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/*
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* adt7410 register access by I2C
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*/
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static int adt7410_temp_ready(struct i2c_client *client)
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{
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int i, status;
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for (i = 0; i < 6; i++) {
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status = i2c_smbus_read_byte_data(client, ADT7410_STATUS);
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if (status < 0)
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return status;
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if (!(status & ADT7410_STAT_NOT_RDY))
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return 0;
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msleep(60);
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}
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return -ETIMEDOUT;
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}
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static struct adt7410_data *adt7410_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 adt7410_data *data = i2c_get_clientdata(client);
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struct adt7410_data *ret = data;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
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|| !data->valid) {
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int i, status;
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dev_dbg(&client->dev, "Starting update\n");
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status = adt7410_temp_ready(client); /* check for new value */
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if (unlikely(status)) {
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ret = ERR_PTR(status);
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goto abort;
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}
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for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
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status = i2c_smbus_read_word_swapped(client,
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ADT7410_REG_TEMP[i]);
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if (unlikely(status < 0)) {
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dev_dbg(dev,
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"Failed to read value: reg %d, error %d\n",
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ADT7410_REG_TEMP[i], status);
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ret = ERR_PTR(status);
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goto abort;
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}
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data->temp[i] = status;
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}
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status = i2c_smbus_read_byte_data(client, ADT7410_T_HYST);
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if (unlikely(status < 0)) {
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dev_dbg(dev,
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"Failed to read value: reg %d, error %d\n",
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ADT7410_T_HYST, status);
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ret = ERR_PTR(status);
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goto abort;
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}
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data->hyst = status;
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data->last_updated = jiffies;
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data->valid = true;
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}
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abort:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static s16 ADT7410_TEMP_TO_REG(long temp)
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{
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return DIV_ROUND_CLOSEST(SENSORS_LIMIT(temp, ADT7410_TEMP_MIN,
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ADT7410_TEMP_MAX) * 128, 1000);
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}
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static int ADT7410_REG_TO_TEMP(struct adt7410_data *data, s16 reg)
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{
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/* in 13 bit mode, bits 0-2 are status flags - mask them out */
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if (!(data->config & ADT7410_RESOLUTION))
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reg &= ADT7410_T13_VALUE_MASK;
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/*
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* temperature is stored in twos complement format, in steps of
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* 1/128°C
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*/
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return DIV_ROUND_CLOSEST(reg * 1000, 128);
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}
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/*-----------------------------------------------------------------------*/
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/* sysfs attributes for hwmon */
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static ssize_t adt7410_show_temp(struct device *dev,
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struct device_attribute *da, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct adt7410_data *data = adt7410_update_device(dev);
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%d\n", ADT7410_REG_TO_TEMP(data,
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data->temp[attr->index]));
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}
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static ssize_t adt7410_set_temp(struct device *dev,
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struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct i2c_client *client = to_i2c_client(dev);
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struct adt7410_data *data = i2c_get_clientdata(client);
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int nr = attr->index;
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long temp;
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int ret;
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ret = kstrtol(buf, 10, &temp);
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if (ret)
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return ret;
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mutex_lock(&data->update_lock);
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data->temp[nr] = ADT7410_TEMP_TO_REG(temp);
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ret = i2c_smbus_write_word_swapped(client, ADT7410_REG_TEMP[nr],
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data->temp[nr]);
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if (ret)
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count = ret;
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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 adt7410_show_t_hyst(struct device *dev,
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struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct adt7410_data *data = adt7410_update_device(dev);
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int nr = attr->index;
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int hyst = (data->hyst & ADT7410_T_HYST_MASK) * 1000;
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/*
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* hysteresis is stored as a 4 bit offset in the device, convert it
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* to an absolute value
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*/
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if (nr == 2) /* min has positive offset, others have negative */
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hyst = -hyst;
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return sprintf(buf, "%d\n",
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ADT7410_REG_TO_TEMP(data, data->temp[nr]) - hyst);
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}
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static ssize_t adt7410_set_t_hyst(struct device *dev,
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struct device_attribute *da,
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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 adt7410_data *data = i2c_get_clientdata(client);
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int limit, ret;
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long hyst;
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ret = kstrtol(buf, 10, &hyst);
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if (ret)
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return ret;
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/* convert absolute hysteresis value to a 4 bit delta value */
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limit = ADT7410_REG_TO_TEMP(data, data->temp[1]);
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hyst = SENSORS_LIMIT(hyst, ADT7410_TEMP_MIN, ADT7410_TEMP_MAX);
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data->hyst = SENSORS_LIMIT(DIV_ROUND_CLOSEST(limit - hyst, 1000),
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0, ADT7410_T_HYST_MASK);
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ret = i2c_smbus_write_byte_data(client, ADT7410_T_HYST, data->hyst);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t adt7410_show_alarm(struct device *dev,
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struct device_attribute *da,
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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 sensor_device_attribute *attr = to_sensor_dev_attr(da);
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int ret;
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ret = i2c_smbus_read_byte_data(client, ADT7410_STATUS);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", !!(ret & attr->index));
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7410_show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
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adt7410_show_temp, adt7410_set_temp, 1);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
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adt7410_show_temp, adt7410_set_temp, 2);
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static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO,
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adt7410_show_temp, adt7410_set_temp, 3);
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static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
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adt7410_show_t_hyst, adt7410_set_t_hyst, 1);
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static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO,
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adt7410_show_t_hyst, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
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adt7410_show_t_hyst, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7410_show_alarm,
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NULL, ADT7410_STAT_T_LOW);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7410_show_alarm,
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NULL, ADT7410_STAT_T_HIGH);
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static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7410_show_alarm,
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NULL, ADT7410_STAT_T_CRIT);
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static struct attribute *adt7410_attributes[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_hyst.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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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
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NULL
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};
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static const struct attribute_group adt7410_group = {
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.attrs = adt7410_attributes,
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};
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/*-----------------------------------------------------------------------*/
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/* device probe and removal */
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static int adt7410_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct adt7410_data *data;
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int ret;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
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return -ENODEV;
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data = devm_kzalloc(&client->dev, sizeof(struct adt7410_data),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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i2c_set_clientdata(client, data);
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mutex_init(&data->update_lock);
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/* configure as specified */
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ret = i2c_smbus_read_byte_data(client, ADT7410_CONFIG);
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if (ret < 0) {
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dev_dbg(&client->dev, "Can't read config? %d\n", ret);
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return ret;
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}
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data->oldconfig = ret;
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/*
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* Set to 16 bit resolution, continous conversion and comparator mode.
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*/
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data->config = ret | ADT7410_FULL | ADT7410_RESOLUTION |
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ADT7410_EVENT_MODE;
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if (data->config != data->oldconfig) {
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ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
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data->config);
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if (ret)
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return ret;
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}
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dev_dbg(&client->dev, "Config %02x\n", data->config);
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/* Register sysfs hooks */
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ret = sysfs_create_group(&client->dev.kobj, &adt7410_group);
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if (ret)
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goto exit_restore;
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data->hwmon_dev = hwmon_device_register(&client->dev);
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if (IS_ERR(data->hwmon_dev)) {
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ret = PTR_ERR(data->hwmon_dev);
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goto exit_remove;
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}
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dev_info(&client->dev, "sensor '%s'\n", client->name);
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return 0;
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exit_remove:
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sysfs_remove_group(&client->dev.kobj, &adt7410_group);
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exit_restore:
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i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->oldconfig);
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return ret;
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}
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static int adt7410_remove(struct i2c_client *client)
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{
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struct adt7410_data *data = i2c_get_clientdata(client);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &adt7410_group);
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if (data->oldconfig != data->config)
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i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
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data->oldconfig);
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return 0;
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}
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static const struct i2c_device_id adt7410_ids[] = {
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{ "adt7410", adt7410, },
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{ /* LIST END */ }
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};
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MODULE_DEVICE_TABLE(i2c, adt7410_ids);
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#ifdef CONFIG_PM
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static int adt7410_suspend(struct device *dev)
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{
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int ret;
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struct i2c_client *client = to_i2c_client(dev);
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struct adt7410_data *data = i2c_get_clientdata(client);
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ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG,
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data->config | ADT7410_PD);
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return ret;
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}
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static int adt7410_resume(struct device *dev)
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{
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int ret;
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struct i2c_client *client = to_i2c_client(dev);
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struct adt7410_data *data = i2c_get_clientdata(client);
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ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->config);
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return ret;
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}
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static const struct dev_pm_ops adt7410_dev_pm_ops = {
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.suspend = adt7410_suspend,
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.resume = adt7410_resume,
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};
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#define ADT7410_DEV_PM_OPS (&adt7410_dev_pm_ops)
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#else
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#define ADT7410_DEV_PM_OPS NULL
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#endif /* CONFIG_PM */
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static struct i2c_driver adt7410_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "adt7410",
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.pm = ADT7410_DEV_PM_OPS,
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},
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.probe = adt7410_probe,
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.remove = adt7410_remove,
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.id_table = adt7410_ids,
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.address_list = normal_i2c,
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};
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module_i2c_driver(adt7410_driver);
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MODULE_AUTHOR("Hartmut Knaack");
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MODULE_DESCRIPTION("ADT7410 driver");
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MODULE_LICENSE("GPL");
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