386 lines
11 KiB
C
386 lines
11 KiB
C
/*
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* lm83.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de>
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*
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* Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
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* a sensor chip made by National Semiconductor. It reports up to four
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* temperatures (its own plus up to three external ones) with a 1 deg
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* resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
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* from National's website at:
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* http://www.national.com/pf/LM/LM83.html
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* Since the datasheet omits to give the chip stepping code, I give it
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* here: 0x03 (at register 0xff).
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*
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* Also supports the LM82 temp sensor, which is basically a stripped down
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* model of the LM83. Datasheet is here:
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* http://www.national.com/pf/LM/LM82.html
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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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#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-sysfs.h>
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#include <linux/hwmon.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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/*
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* Addresses to scan
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* Address is selected using 2 three-level pins, resulting in 9 possible
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* addresses.
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*/
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static const unsigned short normal_i2c[] = {
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0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
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enum chips { lm83, lm82 };
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/*
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* The LM83 registers
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* Manufacturer ID is 0x01 for National Semiconductor.
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*/
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#define LM83_REG_R_MAN_ID 0xFE
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#define LM83_REG_R_CHIP_ID 0xFF
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#define LM83_REG_R_CONFIG 0x03
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#define LM83_REG_W_CONFIG 0x09
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#define LM83_REG_R_STATUS1 0x02
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#define LM83_REG_R_STATUS2 0x35
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#define LM83_REG_R_LOCAL_TEMP 0x00
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#define LM83_REG_R_LOCAL_HIGH 0x05
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#define LM83_REG_W_LOCAL_HIGH 0x0B
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#define LM83_REG_R_REMOTE1_TEMP 0x30
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#define LM83_REG_R_REMOTE1_HIGH 0x38
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#define LM83_REG_W_REMOTE1_HIGH 0x50
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#define LM83_REG_R_REMOTE2_TEMP 0x01
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#define LM83_REG_R_REMOTE2_HIGH 0x07
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#define LM83_REG_W_REMOTE2_HIGH 0x0D
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#define LM83_REG_R_REMOTE3_TEMP 0x31
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#define LM83_REG_R_REMOTE3_HIGH 0x3A
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#define LM83_REG_W_REMOTE3_HIGH 0x52
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#define LM83_REG_R_TCRIT 0x42
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#define LM83_REG_W_TCRIT 0x5A
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/*
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* Conversions and various macros
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* The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
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*/
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#define TEMP_FROM_REG(val) ((val) * 1000)
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#define TEMP_TO_REG(val) ((val) <= -128000 ? -128 : \
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(val) >= 127000 ? 127 : \
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(val) < 0 ? ((val) - 500) / 1000 : \
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((val) + 500) / 1000)
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static const u8 LM83_REG_R_TEMP[] = {
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LM83_REG_R_LOCAL_TEMP,
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LM83_REG_R_REMOTE1_TEMP,
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LM83_REG_R_REMOTE2_TEMP,
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LM83_REG_R_REMOTE3_TEMP,
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LM83_REG_R_LOCAL_HIGH,
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LM83_REG_R_REMOTE1_HIGH,
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LM83_REG_R_REMOTE2_HIGH,
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LM83_REG_R_REMOTE3_HIGH,
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LM83_REG_R_TCRIT,
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};
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static const u8 LM83_REG_W_HIGH[] = {
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LM83_REG_W_LOCAL_HIGH,
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LM83_REG_W_REMOTE1_HIGH,
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LM83_REG_W_REMOTE2_HIGH,
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LM83_REG_W_REMOTE3_HIGH,
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LM83_REG_W_TCRIT,
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};
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/*
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* Client data (each client gets its own)
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*/
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struct lm83_data {
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struct i2c_client *client;
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const struct attribute_group *groups[3];
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struct mutex update_lock;
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char valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* registers values */
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s8 temp[9]; /* 0..3: input 1-4,
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4..7: high limit 1-4,
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8 : critical limit */
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u16 alarms; /* bitvector, combined */
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};
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static struct lm83_data *lm83_update_device(struct device *dev)
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{
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struct lm83_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
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int nr;
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dev_dbg(&client->dev, "Updating lm83 data.\n");
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for (nr = 0; nr < 9; nr++) {
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data->temp[nr] =
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i2c_smbus_read_byte_data(client,
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LM83_REG_R_TEMP[nr]);
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}
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data->alarms =
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i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
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+ (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
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<< 8);
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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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/*
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* Sysfs stuff
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*/
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static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct lm83_data *data = lm83_update_device(dev);
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
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}
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static ssize_t temp_store(struct device *dev,
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struct device_attribute *devattr, const char *buf,
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size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct lm83_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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long val;
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int nr = attr->index;
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int err;
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err = kstrtol(buf, 10, &val);
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if (err < 0)
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return err;
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mutex_lock(&data->update_lock);
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data->temp[nr] = TEMP_TO_REG(val);
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i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
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data->temp[nr]);
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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 alarms_show(struct device *dev, struct device_attribute *dummy,
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char *buf)
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{
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struct lm83_data *data = lm83_update_device(dev);
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return sprintf(buf, "%d\n", data->alarms);
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}
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static ssize_t alarm_show(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct lm83_data *data = lm83_update_device(dev);
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int bitnr = attr->index;
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return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
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}
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
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static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
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static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
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static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
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static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 4);
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static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 5);
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static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 6);
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static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 7);
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static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp, 8);
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static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp, 8);
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static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 8);
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static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp, 8);
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/* Individual alarm files */
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static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 0);
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static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 1);
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static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
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static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 4);
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static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
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static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
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static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 9);
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static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 10);
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static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 12);
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static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 13);
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static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 15);
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/* Raw alarm file for compatibility */
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static DEVICE_ATTR_RO(alarms);
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static struct attribute *lm83_attributes[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp3_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp3_max.dev_attr.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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&sensor_dev_attr_temp3_crit.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_fault.dev_attr.attr,
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&sensor_dev_attr_temp3_max_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 lm83_group = {
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.attrs = lm83_attributes,
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};
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static struct attribute *lm83_attributes_opt[] = {
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp4_input.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp4_max.dev_attr.attr,
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&sensor_dev_attr_temp2_crit.dev_attr.attr,
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&sensor_dev_attr_temp4_crit.dev_attr.attr,
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&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_fault.dev_attr.attr,
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&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_fault.dev_attr.attr,
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
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NULL
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};
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static const struct attribute_group lm83_group_opt = {
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.attrs = lm83_attributes_opt,
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};
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/*
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* Real code
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*/
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int lm83_detect(struct i2c_client *new_client,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = new_client->adapter;
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const char *name;
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u8 man_id, chip_id;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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/* Detection */
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if ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1) & 0xA8) ||
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(i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2) & 0x48) ||
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(i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG) & 0x41)) {
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dev_dbg(&adapter->dev, "LM83 detection failed at 0x%02x\n",
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new_client->addr);
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return -ENODEV;
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}
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/* Identification */
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man_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_MAN_ID);
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if (man_id != 0x01) /* National Semiconductor */
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return -ENODEV;
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chip_id = i2c_smbus_read_byte_data(new_client, LM83_REG_R_CHIP_ID);
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switch (chip_id) {
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case 0x03:
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name = "lm83";
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break;
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case 0x01:
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name = "lm82";
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break;
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default:
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/* identification failed */
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dev_info(&adapter->dev,
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"Unsupported chip (man_id=0x%02X, chip_id=0x%02X)\n",
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man_id, chip_id);
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return -ENODEV;
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}
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strlcpy(info->type, name, I2C_NAME_SIZE);
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return 0;
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}
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static int lm83_probe(struct i2c_client *new_client,
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const struct i2c_device_id *id)
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{
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struct device *hwmon_dev;
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struct lm83_data *data;
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data = devm_kzalloc(&new_client->dev, sizeof(struct lm83_data),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->client = new_client;
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mutex_init(&data->update_lock);
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/*
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* Register sysfs hooks
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* The LM82 can only monitor one external diode which is
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* at the same register as the LM83 temp3 entry - so we
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* declare 1 and 3 common, and then 2 and 4 only for the LM83.
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*/
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data->groups[0] = &lm83_group;
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if (id->driver_data == lm83)
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data->groups[1] = &lm83_group_opt;
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hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
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new_client->name,
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data, data->groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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/*
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* Driver data (common to all clients)
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*/
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static const struct i2c_device_id lm83_id[] = {
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{ "lm83", lm83 },
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{ "lm82", lm82 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lm83_id);
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static struct i2c_driver lm83_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "lm83",
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},
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.probe = lm83_probe,
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.id_table = lm83_id,
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.detect = lm83_detect,
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.address_list = normal_i2c,
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};
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module_i2c_driver(lm83_driver);
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MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
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MODULE_DESCRIPTION("LM83 driver");
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MODULE_LICENSE("GPL");
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