507 lines
15 KiB
C
507 lines
15 KiB
C
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/*
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* adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
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* Philip Edelbrock <phil@netroedge.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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/* Addresses to scan */
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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 {
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adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066 };
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/* adm1021 constants specified below */
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/* The adm1021 registers */
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/* Read-only */
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/* For nr in 0-1 */
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#define ADM1021_REG_TEMP(nr) (nr)
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#define ADM1021_REG_STATUS 0x02
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/* 0x41 = AD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi */
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#define ADM1021_REG_MAN_ID 0xFE
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/* ADM1021 = 0x0X, ADM1023 = 0x3X */
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#define ADM1021_REG_DEV_ID 0xFF
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/* These use different addresses for reading/writing */
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#define ADM1021_REG_CONFIG_R 0x03
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#define ADM1021_REG_CONFIG_W 0x09
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#define ADM1021_REG_CONV_RATE_R 0x04
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#define ADM1021_REG_CONV_RATE_W 0x0A
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/* These are for the ADM1023's additional precision on the remote temp sensor */
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#define ADM1023_REG_REM_TEMP_PREC 0x10
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#define ADM1023_REG_REM_OFFSET 0x11
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#define ADM1023_REG_REM_OFFSET_PREC 0x12
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#define ADM1023_REG_REM_TOS_PREC 0x13
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#define ADM1023_REG_REM_THYST_PREC 0x14
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/* limits */
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/* For nr in 0-1 */
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#define ADM1021_REG_TOS_R(nr) (0x05 + 2 * (nr))
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#define ADM1021_REG_TOS_W(nr) (0x0B + 2 * (nr))
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#define ADM1021_REG_THYST_R(nr) (0x06 + 2 * (nr))
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#define ADM1021_REG_THYST_W(nr) (0x0C + 2 * (nr))
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/* write-only */
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#define ADM1021_REG_ONESHOT 0x0F
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/* Initial values */
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/*
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* Note: Even though I left the low and high limits named os and hyst,
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* they don't quite work like a thermostat the way the LM75 does. I.e.,
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* a lower temp than THYST actually triggers an alarm instead of
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* clearing it. Weird, ey? --Phil
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*/
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/* Each client has this additional data */
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struct adm1021_data {
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struct i2c_client *client;
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enum chips type;
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const struct attribute_group *groups[3];
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struct mutex update_lock;
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char valid; /* !=0 if following fields are valid */
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char low_power; /* !=0 if device in low power mode */
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unsigned long last_updated; /* In jiffies */
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int temp_max[2]; /* Register values */
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int temp_min[2];
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int temp[2];
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u8 alarms;
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/* Special values for ADM1023 only */
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u8 remote_temp_offset;
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u8 remote_temp_offset_prec;
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};
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/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
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static bool read_only;
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static struct adm1021_data *adm1021_update_device(struct device *dev)
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{
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struct adm1021_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 + HZ / 2)
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|| !data->valid) {
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int i;
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dev_dbg(dev, "Starting adm1021 update\n");
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for (i = 0; i < 2; i++) {
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data->temp[i] = 1000 *
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(s8) i2c_smbus_read_byte_data(
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client, ADM1021_REG_TEMP(i));
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data->temp_max[i] = 1000 *
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(s8) i2c_smbus_read_byte_data(
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client, ADM1021_REG_TOS_R(i));
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if (data->type != lm84) {
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data->temp_min[i] = 1000 *
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(s8) i2c_smbus_read_byte_data(client,
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ADM1021_REG_THYST_R(i));
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}
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}
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data->alarms = i2c_smbus_read_byte_data(client,
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ADM1021_REG_STATUS) & 0x7c;
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if (data->type == adm1023) {
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/*
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* The ADM1023 provides 3 extra bits of precision for
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* the remote sensor in extra registers.
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*/
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data->temp[1] += 125 * (i2c_smbus_read_byte_data(
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client, ADM1023_REG_REM_TEMP_PREC) >> 5);
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data->temp_max[1] += 125 * (i2c_smbus_read_byte_data(
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client, ADM1023_REG_REM_TOS_PREC) >> 5);
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data->temp_min[1] += 125 * (i2c_smbus_read_byte_data(
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client, ADM1023_REG_REM_THYST_PREC) >> 5);
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data->remote_temp_offset =
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i2c_smbus_read_byte_data(client,
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ADM1023_REG_REM_OFFSET);
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data->remote_temp_offset_prec =
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i2c_smbus_read_byte_data(client,
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ADM1023_REG_REM_OFFSET_PREC);
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}
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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 ssize_t show_temp(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%d\n", data->temp[index]);
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}
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static ssize_t show_temp_max(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%d\n", data->temp_max[index]);
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}
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static ssize_t show_temp_min(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%d\n", data->temp_min[index]);
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}
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static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int index = to_sensor_dev_attr(attr)->index;
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%u\n", (data->alarms >> index) & 1);
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}
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static ssize_t show_alarms(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%u\n", data->alarms);
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}
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static ssize_t set_temp_max(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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struct adm1021_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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long temp;
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int reg_val, err;
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err = kstrtol(buf, 10, &temp);
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if (err)
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return err;
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temp /= 1000;
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mutex_lock(&data->update_lock);
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reg_val = clamp_val(temp, -128, 127);
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data->temp_max[index] = reg_val * 1000;
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if (!read_only)
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i2c_smbus_write_byte_data(client, ADM1021_REG_TOS_W(index),
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reg_val);
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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 set_temp_min(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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struct adm1021_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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long temp;
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int reg_val, err;
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err = kstrtol(buf, 10, &temp);
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if (err)
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return err;
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temp /= 1000;
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mutex_lock(&data->update_lock);
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reg_val = clamp_val(temp, -128, 127);
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data->temp_min[index] = reg_val * 1000;
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if (!read_only)
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i2c_smbus_write_byte_data(client, ADM1021_REG_THYST_W(index),
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reg_val);
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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_low_power(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct adm1021_data *data = adm1021_update_device(dev);
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return sprintf(buf, "%d\n", data->low_power);
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}
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static ssize_t set_low_power(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct adm1021_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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char low_power;
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unsigned long val;
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int err;
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err = kstrtoul(buf, 10, &val);
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if (err)
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return err;
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low_power = val != 0;
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mutex_lock(&data->update_lock);
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if (low_power != data->low_power) {
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int config = i2c_smbus_read_byte_data(
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client, ADM1021_REG_CONFIG_R);
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data->low_power = low_power;
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i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
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(config & 0xBF) | (low_power << 6));
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}
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mutex_unlock(&data->update_lock);
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return count;
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}
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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_max, S_IWUSR | S_IRUGO, show_temp_max,
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set_temp_max, 0);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
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set_temp_min, 0);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
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set_temp_max, 1);
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static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
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set_temp_min, 1);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
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static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
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static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
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static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
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static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power);
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static struct attribute *adm1021_attributes[] = {
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_fault.dev_attr.attr,
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&dev_attr_alarms.attr,
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&dev_attr_low_power.attr,
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NULL
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};
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static const struct attribute_group adm1021_group = {
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.attrs = adm1021_attributes,
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};
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static struct attribute *adm1021_min_attributes[] = {
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp2_min.dev_attr.attr,
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
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NULL
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};
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static const struct attribute_group adm1021_min_group = {
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.attrs = adm1021_min_attributes,
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};
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int adm1021_detect(struct i2c_client *client,
|
||
|
|
struct i2c_board_info *info)
|
||
|
|
{
|
||
|
|
struct i2c_adapter *adapter = client->adapter;
|
||
|
|
const char *type_name;
|
||
|
|
int conv_rate, status, config, man_id, dev_id;
|
||
|
|
|
||
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
|
||
|
|
pr_debug("detect failed, smbus byte data not supported!\n");
|
||
|
|
return -ENODEV;
|
||
|
|
}
|
||
|
|
|
||
|
|
status = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS);
|
||
|
|
conv_rate = i2c_smbus_read_byte_data(client,
|
||
|
|
ADM1021_REG_CONV_RATE_R);
|
||
|
|
config = i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R);
|
||
|
|
|
||
|
|
/* Check unused bits */
|
||
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|
if ((status & 0x03) || (config & 0x3F) || (conv_rate & 0xF8)) {
|
||
|
|
pr_debug("detect failed, chip not detected!\n");
|
||
|
|
return -ENODEV;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Determine the chip type. */
|
||
|
|
man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
|
||
|
|
dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
|
||
|
|
|
||
|
|
if (man_id < 0 || dev_id < 0)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
if (man_id == 0x4d && dev_id == 0x01)
|
||
|
|
type_name = "max1617a";
|
||
|
|
else if (man_id == 0x41) {
|
||
|
|
if ((dev_id & 0xF0) == 0x30)
|
||
|
|
type_name = "adm1023";
|
||
|
|
else if ((dev_id & 0xF0) == 0x00)
|
||
|
|
type_name = "adm1021";
|
||
|
|
else
|
||
|
|
return -ENODEV;
|
||
|
|
} else if (man_id == 0x49)
|
||
|
|
type_name = "thmc10";
|
||
|
|
else if (man_id == 0x23)
|
||
|
|
type_name = "gl523sm";
|
||
|
|
else if (man_id == 0x54)
|
||
|
|
type_name = "mc1066";
|
||
|
|
else {
|
||
|
|
int lte, rte, lhi, rhi, llo, rlo;
|
||
|
|
|
||
|
|
/* extra checks for LM84 and MAX1617 to avoid misdetections */
|
||
|
|
|
||
|
|
llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
|
||
|
|
rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
|
||
|
|
|
||
|
|
/* fail if any of the additional register reads failed */
|
||
|
|
if (llo < 0 || rlo < 0)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
|
||
|
|
rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
|
||
|
|
lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
|
||
|
|
rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Fail for negative temperatures and negative high limits.
|
||
|
|
* This check also catches read errors on the tested registers.
|
||
|
|
*/
|
||
|
|
if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
/* fail if all registers hold the same value */
|
||
|
|
if (lte == rte && lte == lhi && lte == rhi && lte == llo
|
||
|
|
&& lte == rlo)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* LM84 Mfr ID is in a different place,
|
||
|
|
* and it has more unused bits.
|
||
|
|
*/
|
||
|
|
if (conv_rate == 0x00
|
||
|
|
&& (config & 0x7F) == 0x00
|
||
|
|
&& (status & 0xAB) == 0x00) {
|
||
|
|
type_name = "lm84";
|
||
|
|
} else {
|
||
|
|
/* fail if low limits are larger than high limits */
|
||
|
|
if ((s8)llo > lhi || (s8)rlo > rhi)
|
||
|
|
return -ENODEV;
|
||
|
|
type_name = "max1617";
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",
|
||
|
|
type_name, i2c_adapter_id(adapter), client->addr);
|
||
|
|
strlcpy(info->type, type_name, I2C_NAME_SIZE);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void adm1021_init_client(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
/* Enable ADC and disable suspend mode */
|
||
|
|
i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W,
|
||
|
|
i2c_smbus_read_byte_data(client, ADM1021_REG_CONFIG_R) & 0xBF);
|
||
|
|
/* Set Conversion rate to 1/sec (this can be tinkered with) */
|
||
|
|
i2c_smbus_write_byte_data(client, ADM1021_REG_CONV_RATE_W, 0x04);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adm1021_probe(struct i2c_client *client,
|
||
|
|
const struct i2c_device_id *id)
|
||
|
|
{
|
||
|
|
struct device *dev = &client->dev;
|
||
|
|
struct adm1021_data *data;
|
||
|
|
struct device *hwmon_dev;
|
||
|
|
|
||
|
|
data = devm_kzalloc(dev, sizeof(struct adm1021_data), GFP_KERNEL);
|
||
|
|
if (!data)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
data->client = client;
|
||
|
|
data->type = id->driver_data;
|
||
|
|
mutex_init(&data->update_lock);
|
||
|
|
|
||
|
|
/* Initialize the ADM1021 chip */
|
||
|
|
if (data->type != lm84 && !read_only)
|
||
|
|
adm1021_init_client(client);
|
||
|
|
|
||
|
|
data->groups[0] = &adm1021_group;
|
||
|
|
if (data->type != lm84)
|
||
|
|
data->groups[1] = &adm1021_min_group;
|
||
|
|
|
||
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
|
||
|
|
data, data->groups);
|
||
|
|
|
||
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct i2c_device_id adm1021_id[] = {
|
||
|
|
{ "adm1021", adm1021 },
|
||
|
|
{ "adm1023", adm1023 },
|
||
|
|
{ "max1617", max1617 },
|
||
|
|
{ "max1617a", max1617a },
|
||
|
|
{ "thmc10", thmc10 },
|
||
|
|
{ "lm84", lm84 },
|
||
|
|
{ "gl523sm", gl523sm },
|
||
|
|
{ "mc1066", mc1066 },
|
||
|
|
{ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(i2c, adm1021_id);
|
||
|
|
|
||
|
|
static struct i2c_driver adm1021_driver = {
|
||
|
|
.class = I2C_CLASS_HWMON,
|
||
|
|
.driver = {
|
||
|
|
.name = "adm1021",
|
||
|
|
},
|
||
|
|
.probe = adm1021_probe,
|
||
|
|
.id_table = adm1021_id,
|
||
|
|
.detect = adm1021_detect,
|
||
|
|
.address_list = normal_i2c,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_i2c_driver(adm1021_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
|
||
|
|
"Philip Edelbrock <phil@netroedge.com>");
|
||
|
|
MODULE_DESCRIPTION("adm1021 driver");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
|
||
|
|
module_param(read_only, bool, 0);
|
||
|
|
MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
|