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448 lines
13 KiB
448 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 2011 David George <[email protected]> |
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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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char valid; /* !=0 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 = 1; |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver"); |
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MODULE_LICENSE("GPL");
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