2005-04-17 00:20:36 +02:00
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/*
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2012-01-14 22:26:08 +01:00
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* ds1621.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Christian W. Zuckschwerdt <zany@triq.net> 2000-11-23
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* based on lm75.c by Frodo Looijaard <frodol@dds.nl>
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* Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
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* the help of Jean Delvare <khali@linux-fr.org>
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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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2005-04-17 00:20:36 +02:00
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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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2005-07-16 03:39:18 +02:00
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#include <linux/hwmon.h>
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2007-06-09 16:11:15 +02:00
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#include <linux/hwmon-sysfs.h>
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2005-07-16 03:39:18 +02:00
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#include <linux/err.h>
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2006-01-18 23:19:26 +01:00
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#include <linux/mutex.h>
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2006-09-24 21:24:46 +02:00
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#include <linux/sysfs.h>
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2005-04-17 00:20:36 +02:00
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#include "lm75.h"
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/* Addresses to scan */
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2008-02-18 04:28:03 +01:00
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static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
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2005-04-17 00:20:36 +02:00
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0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
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/* Insmod parameters */
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static int polarity = -1;
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module_param(polarity, int, 0);
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MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low");
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/* Many DS1621 constants specified below */
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/* Config register used for detection */
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/* 7 6 5 4 3 2 1 0 */
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/* |Done|THF |TLF |NVB | X | X |POL |1SHOT| */
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#define DS1621_REG_CONFIG_NVB 0x10
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#define DS1621_REG_CONFIG_POLARITY 0x02
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#define DS1621_REG_CONFIG_1SHOT 0x01
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#define DS1621_REG_CONFIG_DONE 0x80
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/* The DS1621 registers */
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2007-06-09 16:11:15 +02:00
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static const u8 DS1621_REG_TEMP[3] = {
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0xAA, /* input, word, RO */
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0xA2, /* min, word, RW */
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0xA1, /* max, word, RW */
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};
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2005-04-17 00:20:36 +02:00
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#define DS1621_REG_CONF 0xAC /* byte, RW */
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#define DS1621_COM_START 0xEE /* no data */
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#define DS1621_COM_STOP 0x22 /* no data */
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/* The DS1621 configuration register */
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#define DS1621_ALARM_TEMP_HIGH 0x40
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#define DS1621_ALARM_TEMP_LOW 0x20
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2007-06-09 16:11:15 +02:00
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/* Conversions */
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2005-04-17 00:20:36 +02:00
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#define ALARMS_FROM_REG(val) ((val) & \
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2012-01-14 22:26:08 +01:00
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(DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW))
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2005-04-17 00:20:36 +02:00
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/* Each client has this additional data */
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struct ds1621_data {
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2007-08-20 22:46:20 +02:00
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struct device *hwmon_dev;
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2006-01-18 23:19:26 +01:00
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struct mutex update_lock;
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2005-04-17 00:20:36 +02:00
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char valid; /* !=0 if following fields are valid */
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unsigned long last_updated; /* In jiffies */
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2007-06-09 16:11:15 +02:00
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u16 temp[3]; /* Register values, word */
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2005-04-17 00:20:36 +02:00
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u8 conf; /* Register encoding, combined */
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};
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static void ds1621_init_client(struct i2c_client *client)
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{
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2009-03-30 21:46:40 +02:00
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u8 conf, new_conf;
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new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
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2005-05-04 02:21:25 +02:00
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/* switch to continuous conversion mode */
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2009-03-30 21:46:40 +02:00
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new_conf &= ~DS1621_REG_CONFIG_1SHOT;
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2005-04-17 00:20:36 +02:00
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/* setup output polarity */
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if (polarity == 0)
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2009-03-30 21:46:40 +02:00
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new_conf &= ~DS1621_REG_CONFIG_POLARITY;
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2005-04-17 00:20:36 +02:00
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else if (polarity == 1)
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2009-03-30 21:46:40 +02:00
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new_conf |= DS1621_REG_CONFIG_POLARITY;
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2012-01-14 22:26:08 +01:00
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2009-03-30 21:46:40 +02:00
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if (conf != new_conf)
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i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf);
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2012-01-14 22:26:08 +01:00
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2005-04-17 00:20:36 +02:00
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/* start conversion */
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i2c_smbus_write_byte(client, DS1621_COM_START);
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}
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2009-03-30 21:46:40 +02:00
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static struct ds1621_data *ds1621_update_client(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ds1621_data *data = i2c_get_clientdata(client);
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u8 new_conf;
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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;
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dev_dbg(&client->dev, "Starting ds1621 update\n");
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2009-03-30 21:46:40 +02:00
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data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
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2009-03-30 21:46:40 +02:00
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for (i = 0; i < ARRAY_SIZE(data->temp); i++)
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2011-11-04 12:00:47 +01:00
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data->temp[i] = i2c_smbus_read_word_swapped(client,
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2009-03-30 21:46:40 +02:00
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DS1621_REG_TEMP[i]);
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2009-03-30 21:46:40 +02:00
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/* reset alarms if necessary */
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new_conf = data->conf;
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if (data->temp[0] > data->temp[1]) /* input > min */
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new_conf &= ~DS1621_ALARM_TEMP_LOW;
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if (data->temp[0] < data->temp[2]) /* input < max */
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new_conf &= ~DS1621_ALARM_TEMP_HIGH;
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if (data->conf != new_conf)
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2009-03-30 21:46:40 +02:00
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i2c_smbus_write_byte_data(client, DS1621_REG_CONF,
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new_conf);
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2009-03-30 21:46:40 +02:00
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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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2007-06-09 16:11:15 +02:00
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static ssize_t show_temp(struct device *dev, 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 ds1621_data *data = ds1621_update_client(dev);
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return sprintf(buf, "%d\n",
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LM75_TEMP_FROM_REG(data->temp[attr->index]));
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2005-04-17 00:20:36 +02:00
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}
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2007-06-09 16:11:15 +02:00
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static ssize_t set_temp(struct device *dev, 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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2009-03-30 21:46:40 +02:00
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struct ds1621_data *data = i2c_get_clientdata(client);
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2012-01-14 22:26:08 +01:00
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long val;
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int err;
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err = kstrtol(buf, 10, &val);
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if (err)
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return err;
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2005-04-17 00:20:36 +02:00
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2007-06-09 16:11:15 +02:00
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mutex_lock(&data->update_lock);
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2012-01-14 22:26:08 +01:00
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data->temp[attr->index] = LM75_TEMP_TO_REG(val);
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2011-11-04 12:00:47 +01:00
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i2c_smbus_write_word_swapped(client, DS1621_REG_TEMP[attr->index],
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data->temp[attr->index]);
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2007-06-09 16:11:15 +02:00
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mutex_unlock(&data->update_lock);
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return count;
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}
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2005-04-17 00:20:36 +02:00
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2007-06-09 16:11:15 +02:00
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static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
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char *buf)
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2005-04-17 00:20:36 +02:00
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{
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struct ds1621_data *data = ds1621_update_client(dev);
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return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
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}
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2007-06-09 16:11:15 +02:00
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static ssize_t show_alarm(struct device *dev, 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 ds1621_data *data = ds1621_update_client(dev);
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return sprintf(buf, "%d\n", !!(data->conf & attr->index));
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}
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2005-04-17 00:20:36 +02:00
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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2007-06-09 16:11:15 +02:00
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2);
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2007-06-09 16:11:15 +02:00
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
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DS1621_ALARM_TEMP_LOW);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
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DS1621_ALARM_TEMP_HIGH);
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2005-04-17 00:20:36 +02:00
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2006-09-24 21:24:46 +02:00
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static struct attribute *ds1621_attributes[] = {
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2007-06-09 16:11:15 +02:00
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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2007-06-09 16:11:15 +02:00
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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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2006-09-24 21:24:46 +02:00
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&dev_attr_alarms.attr,
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NULL
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};
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static const struct attribute_group ds1621_group = {
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.attrs = ds1621_attributes,
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};
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2005-04-17 00:20:36 +02:00
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2008-07-16 19:30:11 +02:00
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/* Return 0 if detection is successful, -ENODEV otherwise */
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2009-12-14 21:17:23 +01:00
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static int ds1621_detect(struct i2c_client *client,
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2008-07-16 19:30:11 +02:00
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struct i2c_board_info *info)
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2005-04-17 00:20:36 +02:00
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{
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2008-07-16 19:30:11 +02:00
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struct i2c_adapter *adapter = client->adapter;
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2005-04-17 00:20:36 +02:00
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int conf, temp;
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2008-07-16 19:30:11 +02:00
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int i;
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2005-04-17 00:20:36 +02:00
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2012-01-14 22:26:08 +01:00
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
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| I2C_FUNC_SMBUS_WORD_DATA
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2005-04-17 00:20:36 +02:00
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| I2C_FUNC_SMBUS_WRITE_BYTE))
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2008-07-16 19:30:11 +02:00
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return -ENODEV;
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2005-04-17 00:20:36 +02:00
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2012-01-14 22:26:08 +01:00
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/*
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* Now, we do the remaining detection. It is lousy.
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*
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* The NVB bit should be low if no EEPROM write has been requested
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* during the latest 10ms, which is highly improbable in our case.
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*/
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2009-12-09 20:35:57 +01:00
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conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
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if (conf < 0 || conf & DS1621_REG_CONFIG_NVB)
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return -ENODEV;
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/* The 7 lowest bits of a temperature should always be 0. */
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for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) {
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temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]);
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if (temp < 0 || (temp & 0x7f00))
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2008-07-16 19:30:11 +02:00
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return -ENODEV;
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2005-04-17 00:20:36 +02:00
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}
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2008-07-16 19:30:11 +02:00
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strlcpy(info->type, "ds1621", I2C_NAME_SIZE);
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2005-04-17 00:20:36 +02:00
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2008-07-16 19:30:11 +02:00
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return 0;
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}
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static int ds1621_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct ds1621_data *data;
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int err;
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data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL);
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if (!data) {
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err = -ENOMEM;
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goto exit;
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}
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i2c_set_clientdata(client, data);
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mutex_init(&data->update_lock);
|
2005-04-17 00:20:36 +02:00
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/* Initialize the DS1621 chip */
|
2007-06-09 16:11:15 +02:00
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ds1621_init_client(client);
|
2005-04-17 00:20:36 +02:00
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/* Register sysfs hooks */
|
2012-01-14 22:26:08 +01:00
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err = sysfs_create_group(&client->dev.kobj, &ds1621_group);
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if (err)
|
2008-07-16 19:30:11 +02:00
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goto exit_free;
|
2006-09-24 21:24:46 +02:00
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|
2007-08-20 22:46:20 +02:00
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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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err = PTR_ERR(data->hwmon_dev);
|
2006-09-24 21:24:46 +02:00
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goto exit_remove_files;
|
2005-07-16 03:39:18 +02:00
|
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|
}
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|
2005-04-17 00:20:36 +02:00
|
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return 0;
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|
2012-01-14 22:26:08 +01:00
|
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|
exit_remove_files:
|
2007-06-09 16:11:15 +02:00
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sysfs_remove_group(&client->dev.kobj, &ds1621_group);
|
2012-01-14 22:26:08 +01:00
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exit_free:
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2005-04-17 00:20:36 +02:00
|
|
|
kfree(data);
|
2012-01-14 22:26:08 +01:00
|
|
|
exit:
|
2005-04-17 00:20:36 +02:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2008-07-16 19:30:11 +02:00
|
|
|
static int ds1621_remove(struct i2c_client *client)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2005-07-16 03:39:18 +02:00
|
|
|
struct ds1621_data *data = i2c_get_clientdata(client);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-08-20 22:46:20 +02:00
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
2006-09-24 21:24:46 +02:00
|
|
|
sysfs_remove_group(&client->dev.kobj, &ds1621_group);
|
2005-07-16 03:39:18 +02:00
|
|
|
|
|
|
|
kfree(data);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-03-30 21:46:40 +02:00
|
|
|
static const struct i2c_device_id ds1621_id[] = {
|
2009-12-14 21:17:26 +01:00
|
|
|
{ "ds1621", 0 },
|
|
|
|
{ "ds1625", 0 },
|
2009-03-30 21:46:40 +02:00
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, ds1621_id);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-03-30 21:46:40 +02:00
|
|
|
/* This is the driver that will be inserted */
|
|
|
|
static struct i2c_driver ds1621_driver = {
|
|
|
|
.class = I2C_CLASS_HWMON,
|
|
|
|
.driver = {
|
|
|
|
.name = "ds1621",
|
|
|
|
},
|
|
|
|
.probe = ds1621_probe,
|
|
|
|
.remove = ds1621_remove,
|
|
|
|
.id_table = ds1621_id,
|
|
|
|
.detect = ds1621_detect,
|
2009-12-14 21:17:25 +01:00
|
|
|
.address_list = normal_i2c,
|
2009-03-30 21:46:40 +02:00
|
|
|
};
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2012-01-20 08:38:18 +01:00
|
|
|
module_i2c_driver(ds1621_driver);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
|
|
|
|
MODULE_DESCRIPTION("DS1621 driver");
|
|
|
|
MODULE_LICENSE("GPL");
|