forked from Minki/linux
359 lines
10 KiB
C
359 lines
10 KiB
C
/*
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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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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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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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#include "lm75.h"
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/* Addresses to scan */
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static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
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0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
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/* Insmod parameters */
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I2C_CLIENT_INSMOD_1(ds1621);
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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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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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#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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/* Conversions */
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#define ALARMS_FROM_REG(val) ((val) & \
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(DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW))
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/* Each client has this additional data */
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struct ds1621_data {
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struct i2c_client client;
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struct device *hwmon_dev;
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struct mutex update_lock;
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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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u16 temp[3]; /* Register values, word */
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u8 conf; /* Register encoding, combined */
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};
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static int ds1621_attach_adapter(struct i2c_adapter *adapter);
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static int ds1621_detect(struct i2c_adapter *adapter, int address,
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int kind);
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static void ds1621_init_client(struct i2c_client *client);
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static int ds1621_detach_client(struct i2c_client *client);
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static struct ds1621_data *ds1621_update_client(struct device *dev);
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/* This is the driver that will be inserted */
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static struct i2c_driver ds1621_driver = {
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.driver = {
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.name = "ds1621",
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},
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.attach_adapter = ds1621_attach_adapter,
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.detach_client = ds1621_detach_client,
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};
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/* All registers are word-sized, except for the configuration register.
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DS1621 uses a high-byte first convention, which is exactly opposite to
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the SMBus standard. */
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static int ds1621_read_value(struct i2c_client *client, u8 reg)
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{
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if (reg == DS1621_REG_CONF)
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return i2c_smbus_read_byte_data(client, reg);
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else
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return swab16(i2c_smbus_read_word_data(client, reg));
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}
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static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value)
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{
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if (reg == DS1621_REG_CONF)
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return i2c_smbus_write_byte_data(client, reg, value);
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else
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return i2c_smbus_write_word_data(client, reg, swab16(value));
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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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int reg = ds1621_read_value(client, DS1621_REG_CONF);
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/* switch to continuous conversion mode */
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reg &= ~ DS1621_REG_CONFIG_1SHOT;
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/* setup output polarity */
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if (polarity == 0)
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reg &= ~DS1621_REG_CONFIG_POLARITY;
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else if (polarity == 1)
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reg |= DS1621_REG_CONFIG_POLARITY;
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ds1621_write_value(client, DS1621_REG_CONF, reg);
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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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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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}
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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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struct ds1621_data *data = ds1621_update_client(dev);
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u16 val = LM75_TEMP_TO_REG(simple_strtol(buf, NULL, 10));
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mutex_lock(&data->update_lock);
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data->temp[attr->index] = val;
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ds1621_write_value(client, DS1621_REG_TEMP[attr->index],
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data->temp[attr->index]);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
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char *buf)
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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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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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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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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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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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static struct attribute *ds1621_attributes[] = {
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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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&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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&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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static int ds1621_attach_adapter(struct i2c_adapter *adapter)
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{
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if (!(adapter->class & I2C_CLASS_HWMON))
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return 0;
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return i2c_probe(adapter, &addr_data, ds1621_detect);
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}
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/* This function is called by i2c_probe */
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static int ds1621_detect(struct i2c_adapter *adapter, int address,
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int kind)
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{
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int conf, temp;
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struct i2c_client *client;
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struct ds1621_data *data;
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int i, err = 0;
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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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| I2C_FUNC_SMBUS_WRITE_BYTE))
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goto exit;
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/* OK. For now, we presume we have a valid client. We now create the
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client structure, even though we cannot fill it completely yet.
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But it allows us to access ds1621_{read,write}_value. */
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if (!(data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit;
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}
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client = &data->client;
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i2c_set_clientdata(client, data);
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client->addr = address;
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client->adapter = adapter;
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client->driver = &ds1621_driver;
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/* Now, we do the remaining detection. It is lousy. */
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if (kind < 0) {
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/* The NVB bit should be low if no EEPROM write has been
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requested during the latest 10ms, which is highly
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improbable in our case. */
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conf = ds1621_read_value(client, DS1621_REG_CONF);
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if (conf & DS1621_REG_CONFIG_NVB)
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goto exit_free;
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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(data->temp); i++) {
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temp = ds1621_read_value(client, DS1621_REG_TEMP[i]);
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if (temp & 0x007f)
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goto exit_free;
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}
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}
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/* Fill in remaining client fields and put it into the global list */
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strlcpy(client->name, "ds1621", I2C_NAME_SIZE);
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mutex_init(&data->update_lock);
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/* Tell the I2C layer a new client has arrived */
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if ((err = i2c_attach_client(client)))
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goto exit_free;
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/* Initialize the DS1621 chip */
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ds1621_init_client(client);
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/* Register sysfs hooks */
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if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group)))
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goto exit_detach;
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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);
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goto exit_remove_files;
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}
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return 0;
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exit_remove_files:
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sysfs_remove_group(&client->dev.kobj, &ds1621_group);
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exit_detach:
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i2c_detach_client(client);
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exit_free:
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kfree(data);
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exit:
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return err;
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}
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static int ds1621_detach_client(struct i2c_client *client)
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{
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struct ds1621_data *data = i2c_get_clientdata(client);
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int err;
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &ds1621_group);
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if ((err = i2c_detach_client(client)))
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return err;
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kfree(data);
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return 0;
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}
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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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data->conf = ds1621_read_value(client, DS1621_REG_CONF);
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for (i = 0; i < ARRAY_SIZE(data->temp); i++)
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data->temp[i] = ds1621_read_value(client,
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DS1621_REG_TEMP[i]);
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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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ds1621_write_value(client, DS1621_REG_CONF,
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new_conf);
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data->last_updated = jiffies;
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data->valid = 1;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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static int __init ds1621_init(void)
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{
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return i2c_add_driver(&ds1621_driver);
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}
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static void __exit ds1621_exit(void)
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{
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i2c_del_driver(&ds1621_driver);
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}
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MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
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MODULE_DESCRIPTION("DS1621 driver");
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MODULE_LICENSE("GPL");
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module_init(ds1621_init);
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module_exit(ds1621_exit);
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