512 lines
13 KiB
C
512 lines
13 KiB
C
/*
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* adt7x10.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/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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#include <linux/interrupt.h>
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#include "adt7x10.h"
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/*
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* ADT7X10 status
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*/
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#define ADT7X10_STAT_T_LOW (1 << 4)
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#define ADT7X10_STAT_T_HIGH (1 << 5)
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#define ADT7X10_STAT_T_CRIT (1 << 6)
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#define ADT7X10_STAT_NOT_RDY (1 << 7)
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/*
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* ADT7X10 config
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*/
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#define ADT7X10_FAULT_QUEUE_MASK (1 << 0 | 1 << 1)
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#define ADT7X10_CT_POLARITY (1 << 2)
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#define ADT7X10_INT_POLARITY (1 << 3)
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#define ADT7X10_EVENT_MODE (1 << 4)
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#define ADT7X10_MODE_MASK (1 << 5 | 1 << 6)
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#define ADT7X10_FULL (0 << 5 | 0 << 6)
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#define ADT7X10_PD (1 << 5 | 1 << 6)
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#define ADT7X10_RESOLUTION (1 << 7)
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/*
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* ADT7X10 masks
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*/
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#define ADT7X10_T13_VALUE_MASK 0xFFF8
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#define ADT7X10_T_HYST_MASK 0xF
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/* straight from the datasheet */
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#define ADT7X10_TEMP_MIN (-55000)
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#define ADT7X10_TEMP_MAX 150000
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/* Each client has this additional data */
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struct adt7x10_data {
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const struct adt7x10_ops *ops;
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const char *name;
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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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static int adt7x10_read_byte(struct device *dev, u8 reg)
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{
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struct adt7x10_data *d = dev_get_drvdata(dev);
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return d->ops->read_byte(dev, reg);
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}
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static int adt7x10_write_byte(struct device *dev, u8 reg, u8 data)
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{
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struct adt7x10_data *d = dev_get_drvdata(dev);
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return d->ops->write_byte(dev, reg, data);
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}
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static int adt7x10_read_word(struct device *dev, u8 reg)
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{
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struct adt7x10_data *d = dev_get_drvdata(dev);
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return d->ops->read_word(dev, reg);
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}
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static int adt7x10_write_word(struct device *dev, u8 reg, u16 data)
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{
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struct adt7x10_data *d = dev_get_drvdata(dev);
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return d->ops->write_word(dev, reg, data);
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}
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static const u8 ADT7X10_REG_TEMP[4] = {
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ADT7X10_TEMPERATURE, /* input */
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ADT7X10_T_ALARM_HIGH, /* high */
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ADT7X10_T_ALARM_LOW, /* low */
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ADT7X10_T_CRIT, /* critical */
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};
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static irqreturn_t adt7x10_irq_handler(int irq, void *private)
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{
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struct device *dev = private;
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int status;
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status = adt7x10_read_byte(dev, ADT7X10_STATUS);
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if (status < 0)
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return IRQ_HANDLED;
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if (status & ADT7X10_STAT_T_HIGH)
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sysfs_notify(&dev->kobj, NULL, "temp1_max_alarm");
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if (status & ADT7X10_STAT_T_LOW)
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sysfs_notify(&dev->kobj, NULL, "temp1_min_alarm");
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if (status & ADT7X10_STAT_T_CRIT)
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sysfs_notify(&dev->kobj, NULL, "temp1_crit_alarm");
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return IRQ_HANDLED;
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}
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static int adt7x10_temp_ready(struct device *dev)
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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 = adt7x10_read_byte(dev, ADT7X10_STATUS);
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if (status < 0)
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return status;
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if (!(status & ADT7X10_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 int adt7x10_update_temp(struct device *dev)
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{
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struct adt7x10_data *data = dev_get_drvdata(dev);
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int ret = 0;
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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 temp;
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dev_dbg(dev, "Starting update\n");
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ret = adt7x10_temp_ready(dev); /* check for new value */
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if (ret)
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goto abort;
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temp = adt7x10_read_word(dev, ADT7X10_REG_TEMP[0]);
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if (temp < 0) {
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ret = temp;
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dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
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ADT7X10_REG_TEMP[0], ret);
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goto abort;
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}
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data->temp[0] = temp;
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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 int adt7x10_fill_cache(struct device *dev)
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{
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struct adt7x10_data *data = dev_get_drvdata(dev);
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int ret;
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int i;
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for (i = 1; i < ARRAY_SIZE(data->temp); i++) {
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ret = adt7x10_read_word(dev, ADT7X10_REG_TEMP[i]);
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if (ret < 0) {
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dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
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ADT7X10_REG_TEMP[i], ret);
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return ret;
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}
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data->temp[i] = ret;
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}
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ret = adt7x10_read_byte(dev, ADT7X10_T_HYST);
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if (ret < 0) {
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dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
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ADT7X10_T_HYST, ret);
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return ret;
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}
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data->hyst = ret;
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return 0;
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}
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static s16 ADT7X10_TEMP_TO_REG(long temp)
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{
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return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
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ADT7X10_TEMP_MAX) * 128, 1000);
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}
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static int ADT7X10_REG_TO_TEMP(struct adt7x10_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 & ADT7X10_RESOLUTION))
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reg &= ADT7X10_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 adt7x10_show_temp(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 adt7x10_data *data = dev_get_drvdata(dev);
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if (attr->index == 0) {
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int ret;
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ret = adt7x10_update_temp(dev);
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if (ret)
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return ret;
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}
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return sprintf(buf, "%d\n", ADT7X10_REG_TO_TEMP(data,
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data->temp[attr->index]));
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}
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static ssize_t adt7x10_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 adt7x10_data *data = dev_get_drvdata(dev);
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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] = ADT7X10_TEMP_TO_REG(temp);
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ret = adt7x10_write_word(dev, ADT7X10_REG_TEMP[nr], 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 adt7x10_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 adt7x10_data *data = dev_get_drvdata(dev);
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int nr = attr->index;
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int hyst;
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hyst = (data->hyst & ADT7X10_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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ADT7X10_REG_TO_TEMP(data, data->temp[nr]) - hyst);
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}
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static ssize_t adt7x10_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 adt7x10_data *data = dev_get_drvdata(dev);
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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 = ADT7X10_REG_TO_TEMP(data, data->temp[1]);
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hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
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data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000),
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0, ADT7X10_T_HYST_MASK);
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ret = adt7x10_write_byte(dev, ADT7X10_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 adt7x10_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 sensor_device_attribute *attr = to_sensor_dev_attr(da);
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int ret;
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ret = adt7x10_read_byte(dev, ADT7X10_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 ssize_t adt7x10_show_name(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 adt7x10_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%s\n", data->name);
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7x10_show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
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adt7x10_show_temp, adt7x10_set_temp, 1);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
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adt7x10_show_temp, adt7x10_set_temp, 2);
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static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO,
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adt7x10_show_temp, adt7x10_set_temp, 3);
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static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
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adt7x10_show_t_hyst, adt7x10_set_t_hyst, 1);
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static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO,
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adt7x10_show_t_hyst, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
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adt7x10_show_t_hyst, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7x10_show_alarm,
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NULL, ADT7X10_STAT_T_LOW);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7x10_show_alarm,
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NULL, ADT7X10_STAT_T_HIGH);
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static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7x10_show_alarm,
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NULL, ADT7X10_STAT_T_CRIT);
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static DEVICE_ATTR(name, S_IRUGO, adt7x10_show_name, NULL);
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static struct attribute *adt7x10_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 adt7x10_group = {
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.attrs = adt7x10_attributes,
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};
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int adt7x10_probe(struct device *dev, const char *name, int irq,
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const struct adt7x10_ops *ops)
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{
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struct adt7x10_data *data;
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int ret;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->ops = ops;
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data->name = name;
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dev_set_drvdata(dev, data);
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mutex_init(&data->update_lock);
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/* configure as specified */
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ret = adt7x10_read_byte(dev, ADT7X10_CONFIG);
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if (ret < 0) {
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dev_dbg(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 = data->oldconfig;
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data->config &= ~(ADT7X10_MODE_MASK | ADT7X10_CT_POLARITY |
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ADT7X10_INT_POLARITY);
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data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE;
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if (data->config != data->oldconfig) {
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ret = adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
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if (ret)
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return ret;
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}
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dev_dbg(dev, "Config %02x\n", data->config);
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ret = adt7x10_fill_cache(dev);
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if (ret)
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goto exit_restore;
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/* Register sysfs hooks */
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ret = sysfs_create_group(&dev->kobj, &adt7x10_group);
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if (ret)
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goto exit_restore;
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/*
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* The I2C device will already have it's own 'name' attribute, but for
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* the SPI device we need to register it. name will only be non NULL if
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* the device doesn't register the 'name' attribute on its own.
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*/
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if (name) {
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ret = device_create_file(dev, &dev_attr_name);
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if (ret)
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goto exit_remove;
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}
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data->hwmon_dev = hwmon_device_register(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_name;
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}
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if (irq > 0) {
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ret = request_threaded_irq(irq, NULL, adt7x10_irq_handler,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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dev_name(dev), dev);
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if (ret)
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goto exit_hwmon_device_unregister;
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}
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return 0;
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exit_hwmon_device_unregister:
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hwmon_device_unregister(data->hwmon_dev);
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exit_remove_name:
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if (name)
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device_remove_file(dev, &dev_attr_name);
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exit_remove:
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sysfs_remove_group(&dev->kobj, &adt7x10_group);
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exit_restore:
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adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
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return ret;
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}
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EXPORT_SYMBOL_GPL(adt7x10_probe);
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int adt7x10_remove(struct device *dev, int irq)
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{
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struct adt7x10_data *data = dev_get_drvdata(dev);
|
|
|
|
if (irq > 0)
|
|
free_irq(irq, dev);
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
if (data->name)
|
|
device_remove_file(dev, &dev_attr_name);
|
|
sysfs_remove_group(&dev->kobj, &adt7x10_group);
|
|
if (data->oldconfig != data->config)
|
|
adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(adt7x10_remove);
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
static int adt7x10_suspend(struct device *dev)
|
|
{
|
|
struct adt7x10_data *data = dev_get_drvdata(dev);
|
|
|
|
return adt7x10_write_byte(dev, ADT7X10_CONFIG,
|
|
data->config | ADT7X10_PD);
|
|
}
|
|
|
|
static int adt7x10_resume(struct device *dev)
|
|
{
|
|
struct adt7x10_data *data = dev_get_drvdata(dev);
|
|
|
|
return adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
|
|
}
|
|
|
|
SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
|
|
EXPORT_SYMBOL_GPL(adt7x10_dev_pm_ops);
|
|
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
MODULE_AUTHOR("Hartmut Knaack");
|
|
MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
|
|
MODULE_LICENSE("GPL");
|