449 lines
13 KiB
C
449 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2011 David George <david.george@ska.ac.za>
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*
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* based on adm1021.c
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* some credit to Christoph Scheurer, but largely a rewrite
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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 max1668_addr_list[] = {
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0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
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/* max1668 registers */
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#define MAX1668_REG_TEMP(nr) (nr)
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#define MAX1668_REG_STAT1 0x05
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#define MAX1668_REG_STAT2 0x06
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#define MAX1668_REG_MAN_ID 0xfe
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#define MAX1668_REG_DEV_ID 0xff
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/* limits */
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/* write high limits */
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#define MAX1668_REG_LIMH_WR(nr) (0x13 + 2 * (nr))
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/* write low limits */
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#define MAX1668_REG_LIML_WR(nr) (0x14 + 2 * (nr))
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/* read high limits */
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#define MAX1668_REG_LIMH_RD(nr) (0x08 + 2 * (nr))
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/* read low limits */
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#define MAX1668_REG_LIML_RD(nr) (0x09 + 2 * (nr))
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/* manufacturer and device ID Constants */
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#define MAN_ID_MAXIM 0x4d
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#define DEV_ID_MAX1668 0x3
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#define DEV_ID_MAX1805 0x5
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#define DEV_ID_MAX1989 0xb
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/* read only mode module parameter */
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static bool read_only;
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module_param(read_only, bool, 0);
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MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
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enum chips { max1668, max1805, max1989 };
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struct max1668_data {
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struct i2c_client *client;
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const struct attribute_group *groups[3];
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enum chips type;
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struct mutex update_lock;
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bool valid; /* true if following fields are valid */
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unsigned long last_updated; /* In jiffies */
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/* 1x local and 4x remote */
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s8 temp_max[5];
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s8 temp_min[5];
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s8 temp[5];
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u16 alarms;
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};
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static struct max1668_data *max1668_update_device(struct device *dev)
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{
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struct max1668_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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struct max1668_data *ret = data;
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s32 val;
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int i;
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mutex_lock(&data->update_lock);
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if (data->valid && !time_after(jiffies,
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data->last_updated + HZ + HZ / 2))
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goto abort;
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for (i = 0; i < 5; i++) {
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val = i2c_smbus_read_byte_data(client, MAX1668_REG_TEMP(i));
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if (unlikely(val < 0)) {
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ret = ERR_PTR(val);
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goto abort;
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}
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data->temp[i] = (s8) val;
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val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIMH_RD(i));
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if (unlikely(val < 0)) {
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ret = ERR_PTR(val);
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goto abort;
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}
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data->temp_max[i] = (s8) val;
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val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIML_RD(i));
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if (unlikely(val < 0)) {
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ret = ERR_PTR(val);
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goto abort;
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}
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data->temp_min[i] = (s8) val;
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}
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val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT1);
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if (unlikely(val < 0)) {
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ret = ERR_PTR(val);
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goto abort;
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}
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data->alarms = val << 8;
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val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT2);
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if (unlikely(val < 0)) {
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ret = ERR_PTR(val);
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goto abort;
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}
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data->alarms |= val;
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data->last_updated = jiffies;
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data->valid = true;
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abort:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static 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 max1668_data *data = max1668_update_device(dev);
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%d\n", data->temp[index] * 1000);
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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 max1668_data *data = max1668_update_device(dev);
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%d\n", data->temp_max[index] * 1000);
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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 max1668_data *data = max1668_update_device(dev);
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%d\n", data->temp_min[index] * 1000);
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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 max1668_data *data = max1668_update_device(dev);
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
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}
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static ssize_t show_fault(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 max1668_data *data = max1668_update_device(dev);
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%u\n",
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(data->alarms & (1 << 12)) && data->temp[index] == 127);
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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 max1668_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 ret;
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ret = kstrtol(buf, 10, &temp);
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if (ret < 0)
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return ret;
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mutex_lock(&data->update_lock);
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data->temp_max[index] = clamp_val(temp/1000, -128, 127);
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ret = i2c_smbus_write_byte_data(client,
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MAX1668_REG_LIMH_WR(index),
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data->temp_max[index]);
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if (ret < 0)
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count = ret;
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t 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 max1668_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 ret;
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ret = kstrtol(buf, 10, &temp);
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if (ret < 0)
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return ret;
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mutex_lock(&data->update_lock);
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data->temp_min[index] = clamp_val(temp/1000, -128, 127);
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ret = i2c_smbus_write_byte_data(client,
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MAX1668_REG_LIML_WR(index),
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data->temp_min[index]);
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if (ret < 0)
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count = ret;
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mutex_unlock(&data->update_lock);
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return count;
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max,
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set_temp_max, 0);
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static SENSOR_DEVICE_ATTR(temp1_min, 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_IRUGO, show_temp_max,
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set_temp_max, 1);
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static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp_min,
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set_temp_min, 1);
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static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max,
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set_temp_max, 2);
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static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp_min,
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set_temp_min, 2);
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static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max,
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set_temp_max, 3);
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static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO, show_temp_min,
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set_temp_min, 3);
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static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
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static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max,
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set_temp_max, 4);
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static SENSOR_DEVICE_ATTR(temp5_min, S_IRUGO, show_temp_min,
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set_temp_min, 4);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 14);
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 13);
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static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 7);
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static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 6);
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static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 5);
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static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
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static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_alarm, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO, show_alarm, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_fault, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_fault, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_fault, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_fault, NULL, 4);
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/* Attributes common to MAX1668, MAX1989 and MAX1805 */
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static struct attribute *max1668_attribute_common[] = {
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp2_min.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp3_max.dev_attr.attr,
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&sensor_dev_attr_temp3_min.dev_attr.attr,
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&sensor_dev_attr_temp3_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_min_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_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_fault.dev_attr.attr,
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&sensor_dev_attr_temp3_fault.dev_attr.attr,
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NULL
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};
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/* Attributes not present on MAX1805 */
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static struct attribute *max1668_attribute_unique[] = {
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&sensor_dev_attr_temp4_max.dev_attr.attr,
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&sensor_dev_attr_temp4_min.dev_attr.attr,
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&sensor_dev_attr_temp4_input.dev_attr.attr,
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&sensor_dev_attr_temp5_max.dev_attr.attr,
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&sensor_dev_attr_temp5_min.dev_attr.attr,
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&sensor_dev_attr_temp5_input.dev_attr.attr,
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&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_fault.dev_attr.attr,
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&sensor_dev_attr_temp5_fault.dev_attr.attr,
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NULL
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};
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static umode_t max1668_attribute_mode(struct kobject *kobj,
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struct attribute *attr, int index)
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{
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umode_t ret = S_IRUGO;
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if (read_only)
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return ret;
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if (attr == &sensor_dev_attr_temp1_max.dev_attr.attr ||
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attr == &sensor_dev_attr_temp2_max.dev_attr.attr ||
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attr == &sensor_dev_attr_temp3_max.dev_attr.attr ||
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attr == &sensor_dev_attr_temp4_max.dev_attr.attr ||
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attr == &sensor_dev_attr_temp5_max.dev_attr.attr ||
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attr == &sensor_dev_attr_temp1_min.dev_attr.attr ||
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attr == &sensor_dev_attr_temp2_min.dev_attr.attr ||
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attr == &sensor_dev_attr_temp3_min.dev_attr.attr ||
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attr == &sensor_dev_attr_temp4_min.dev_attr.attr ||
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attr == &sensor_dev_attr_temp5_min.dev_attr.attr)
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ret |= S_IWUSR;
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return ret;
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}
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static const struct attribute_group max1668_group_common = {
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.attrs = max1668_attribute_common,
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.is_visible = max1668_attribute_mode
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};
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static const struct attribute_group max1668_group_unique = {
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.attrs = max1668_attribute_unique,
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.is_visible = max1668_attribute_mode
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};
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int max1668_detect(struct i2c_client *client,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = client->adapter;
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const char *type_name;
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int man_id, dev_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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/* Check for unsupported part */
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man_id = i2c_smbus_read_byte_data(client, MAX1668_REG_MAN_ID);
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if (man_id != MAN_ID_MAXIM)
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return -ENODEV;
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dev_id = i2c_smbus_read_byte_data(client, MAX1668_REG_DEV_ID);
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if (dev_id < 0)
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return -ENODEV;
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type_name = NULL;
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if (dev_id == DEV_ID_MAX1668)
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type_name = "max1668";
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else if (dev_id == DEV_ID_MAX1805)
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type_name = "max1805";
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else if (dev_id == DEV_ID_MAX1989)
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type_name = "max1989";
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if (!type_name)
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return -ENODEV;
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strlcpy(info->type, type_name, I2C_NAME_SIZE);
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return 0;
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}
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static const struct i2c_device_id max1668_id[];
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static int max1668_probe(struct i2c_client *client)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct device *dev = &client->dev;
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struct device *hwmon_dev;
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struct max1668_data *data;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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data = devm_kzalloc(dev, sizeof(struct max1668_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->client = client;
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data->type = i2c_match_id(max1668_id, client)->driver_data;
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mutex_init(&data->update_lock);
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/* sysfs hooks */
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data->groups[0] = &max1668_group_common;
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if (data->type == max1668 || data->type == max1989)
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data->groups[1] = &max1668_group_unique;
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, 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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static const struct i2c_device_id max1668_id[] = {
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{ "max1668", max1668 },
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{ "max1805", max1805 },
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{ "max1989", max1989 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max1668_id);
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/* This is the driver that will be inserted */
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static struct i2c_driver max1668_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "max1668",
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},
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.probe_new = max1668_probe,
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.id_table = max1668_id,
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.detect = max1668_detect,
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.address_list = max1668_addr_list,
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};
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module_i2c_driver(max1668_driver);
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MODULE_AUTHOR("David George <david.george@ska.ac.za>");
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MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver");
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MODULE_LICENSE("GPL");
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