319 lines
8.7 KiB
C
319 lines
8.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* max1619.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
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* Jean Delvare <jdelvare@suse.de>
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*
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* Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
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* It reports up to two temperatures (its own plus up to
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* one external one). Complete datasheet can be
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* obtained from Maxim's website at:
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* http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/sysfs.h>
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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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/*
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* The MAX1619 registers
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*/
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#define MAX1619_REG_R_MAN_ID 0xFE
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#define MAX1619_REG_R_CHIP_ID 0xFF
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#define MAX1619_REG_R_CONFIG 0x03
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#define MAX1619_REG_W_CONFIG 0x09
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#define MAX1619_REG_R_CONVRATE 0x04
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#define MAX1619_REG_W_CONVRATE 0x0A
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#define MAX1619_REG_R_STATUS 0x02
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#define MAX1619_REG_R_LOCAL_TEMP 0x00
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#define MAX1619_REG_R_REMOTE_TEMP 0x01
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#define MAX1619_REG_R_REMOTE_HIGH 0x07
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#define MAX1619_REG_W_REMOTE_HIGH 0x0D
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#define MAX1619_REG_R_REMOTE_LOW 0x08
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#define MAX1619_REG_W_REMOTE_LOW 0x0E
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#define MAX1619_REG_R_REMOTE_CRIT 0x10
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#define MAX1619_REG_W_REMOTE_CRIT 0x12
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#define MAX1619_REG_R_TCRIT_HYST 0x11
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#define MAX1619_REG_W_TCRIT_HYST 0x13
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/*
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* Conversions
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*/
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static int temp_from_reg(int val)
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{
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return (val & 0x80 ? val-0x100 : val) * 1000;
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}
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static int temp_to_reg(int val)
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{
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return (val < 0 ? val+0x100*1000 : val) / 1000;
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}
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enum temp_index {
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t_input1 = 0,
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t_input2,
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t_low2,
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t_high2,
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t_crit2,
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t_hyst2,
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t_num_regs
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};
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/*
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* Client data (each client gets its own)
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*/
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struct max1619_data {
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struct i2c_client *client;
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struct mutex update_lock;
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bool valid; /* false until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* registers values */
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u8 temp[t_num_regs]; /* index with enum temp_index */
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u8 alarms;
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};
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static const u8 regs_read[t_num_regs] = {
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[t_input1] = MAX1619_REG_R_LOCAL_TEMP,
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[t_input2] = MAX1619_REG_R_REMOTE_TEMP,
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[t_low2] = MAX1619_REG_R_REMOTE_LOW,
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[t_high2] = MAX1619_REG_R_REMOTE_HIGH,
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[t_crit2] = MAX1619_REG_R_REMOTE_CRIT,
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[t_hyst2] = MAX1619_REG_R_TCRIT_HYST,
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};
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static const u8 regs_write[t_num_regs] = {
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[t_low2] = MAX1619_REG_W_REMOTE_LOW,
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[t_high2] = MAX1619_REG_W_REMOTE_HIGH,
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[t_crit2] = MAX1619_REG_W_REMOTE_CRIT,
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[t_hyst2] = MAX1619_REG_W_TCRIT_HYST,
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};
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static struct max1619_data *max1619_update_device(struct device *dev)
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{
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struct max1619_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int config, i;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
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dev_dbg(&client->dev, "Updating max1619 data.\n");
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for (i = 0; i < t_num_regs; i++)
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data->temp[i] = i2c_smbus_read_byte_data(client,
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regs_read[i]);
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data->alarms = i2c_smbus_read_byte_data(client,
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MAX1619_REG_R_STATUS);
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/* If OVERT polarity is low, reverse alarm bit */
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config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
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if (!(config & 0x20))
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data->alarms ^= 0x02;
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data->last_updated = jiffies;
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data->valid = true;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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/*
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* Sysfs stuff
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*/
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static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct max1619_data *data = max1619_update_device(dev);
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return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
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}
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static ssize_t temp_store(struct device *dev,
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struct device_attribute *devattr, const char *buf,
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size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct max1619_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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long val;
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int err = kstrtol(buf, 10, &val);
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if (err)
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return err;
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mutex_lock(&data->update_lock);
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data->temp[attr->index] = temp_to_reg(val);
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i2c_smbus_write_byte_data(client, regs_write[attr->index],
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data->temp[attr->index]);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct max1619_data *data = max1619_update_device(dev);
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return sprintf(buf, "%d\n", data->alarms);
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}
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static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int bitnr = to_sensor_dev_attr(attr)->index;
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struct max1619_data *data = max1619_update_device(dev);
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return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
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}
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, t_input1);
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static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, t_input2);
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static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, t_low2);
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static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, t_high2);
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static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, t_crit2);
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static SENSOR_DEVICE_ATTR_RW(temp2_crit_hyst, temp, t_hyst2);
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static DEVICE_ATTR_RO(alarms);
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static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 1);
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static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2);
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static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, alarm, 3);
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static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4);
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static struct attribute *max1619_attrs[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp2_min.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp2_crit.dev_attr.attr,
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&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
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&dev_attr_alarms.attr,
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&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_fault.dev_attr.attr,
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&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(max1619);
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int max1619_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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u8 reg_config, reg_convrate, reg_status, man_id, chip_id;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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/* detection */
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reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
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reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
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reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
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if ((reg_config & 0x03) != 0x00
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|| reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) {
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dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
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client->addr);
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return -ENODEV;
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}
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/* identification */
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man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
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chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
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if (man_id != 0x4D || chip_id != 0x04) {
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dev_info(&adapter->dev,
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"Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
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man_id, chip_id);
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return -ENODEV;
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}
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strscpy(info->type, "max1619", I2C_NAME_SIZE);
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return 0;
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}
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static void max1619_init_client(struct i2c_client *client)
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{
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u8 config;
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/*
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* Start the conversions.
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*/
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i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
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5); /* 2 Hz */
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config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
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if (config & 0x40)
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i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
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config & 0xBF); /* run */
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}
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static int max1619_probe(struct i2c_client *new_client)
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{
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struct max1619_data *data;
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struct device *hwmon_dev;
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data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->client = new_client;
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mutex_init(&data->update_lock);
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/* Initialize the MAX1619 chip */
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max1619_init_client(new_client);
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hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
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new_client->name,
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data,
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max1619_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 max1619_id[] = {
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{ "max1619", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max1619_id);
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#ifdef CONFIG_OF
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static const struct of_device_id max1619_of_match[] = {
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{ .compatible = "maxim,max1619", },
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{},
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};
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MODULE_DEVICE_TABLE(of, max1619_of_match);
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#endif
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static struct i2c_driver max1619_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "max1619",
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.of_match_table = of_match_ptr(max1619_of_match),
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},
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.probe = max1619_probe,
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.id_table = max1619_id,
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.detect = max1619_detect,
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.address_list = normal_i2c,
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};
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module_i2c_driver(max1619_driver);
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MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
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MODULE_DESCRIPTION("MAX1619 sensor driver");
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MODULE_LICENSE("GPL");
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