mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 01:59:42 +07:00
fd53f62160
Add new device tree binding for max1619. Signed-off-by: Alan Tull <atull@kernel.org> Cc: Jean Delvare <jdelvare@suse.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Rob Herring <robh+dt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
332 lines
9.4 KiB
C
332 lines
9.4 KiB
C
/*
|
|
* max1619.c - Part of lm_sensors, Linux kernel modules for hardware
|
|
* monitoring
|
|
* Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
|
|
* Jean Delvare <jdelvare@suse.de>
|
|
*
|
|
* Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.
|
|
* It reports up to two temperatures (its own plus up to
|
|
* one external one). Complete datasheet can be
|
|
* obtained from Maxim's website at:
|
|
* http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/sysfs.h>
|
|
|
|
static const unsigned short normal_i2c[] = {
|
|
0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
|
|
|
|
/*
|
|
* The MAX1619 registers
|
|
*/
|
|
|
|
#define MAX1619_REG_R_MAN_ID 0xFE
|
|
#define MAX1619_REG_R_CHIP_ID 0xFF
|
|
#define MAX1619_REG_R_CONFIG 0x03
|
|
#define MAX1619_REG_W_CONFIG 0x09
|
|
#define MAX1619_REG_R_CONVRATE 0x04
|
|
#define MAX1619_REG_W_CONVRATE 0x0A
|
|
#define MAX1619_REG_R_STATUS 0x02
|
|
#define MAX1619_REG_R_LOCAL_TEMP 0x00
|
|
#define MAX1619_REG_R_REMOTE_TEMP 0x01
|
|
#define MAX1619_REG_R_REMOTE_HIGH 0x07
|
|
#define MAX1619_REG_W_REMOTE_HIGH 0x0D
|
|
#define MAX1619_REG_R_REMOTE_LOW 0x08
|
|
#define MAX1619_REG_W_REMOTE_LOW 0x0E
|
|
#define MAX1619_REG_R_REMOTE_CRIT 0x10
|
|
#define MAX1619_REG_W_REMOTE_CRIT 0x12
|
|
#define MAX1619_REG_R_TCRIT_HYST 0x11
|
|
#define MAX1619_REG_W_TCRIT_HYST 0x13
|
|
|
|
/*
|
|
* Conversions
|
|
*/
|
|
|
|
static int temp_from_reg(int val)
|
|
{
|
|
return (val & 0x80 ? val-0x100 : val) * 1000;
|
|
}
|
|
|
|
static int temp_to_reg(int val)
|
|
{
|
|
return (val < 0 ? val+0x100*1000 : val) / 1000;
|
|
}
|
|
|
|
enum temp_index {
|
|
t_input1 = 0,
|
|
t_input2,
|
|
t_low2,
|
|
t_high2,
|
|
t_crit2,
|
|
t_hyst2,
|
|
t_num_regs
|
|
};
|
|
|
|
/*
|
|
* Client data (each client gets its own)
|
|
*/
|
|
|
|
struct max1619_data {
|
|
struct i2c_client *client;
|
|
struct mutex update_lock;
|
|
char valid; /* zero until following fields are valid */
|
|
unsigned long last_updated; /* in jiffies */
|
|
|
|
/* registers values */
|
|
u8 temp[t_num_regs]; /* index with enum temp_index */
|
|
u8 alarms;
|
|
};
|
|
|
|
static const u8 regs_read[t_num_regs] = {
|
|
[t_input1] = MAX1619_REG_R_LOCAL_TEMP,
|
|
[t_input2] = MAX1619_REG_R_REMOTE_TEMP,
|
|
[t_low2] = MAX1619_REG_R_REMOTE_LOW,
|
|
[t_high2] = MAX1619_REG_R_REMOTE_HIGH,
|
|
[t_crit2] = MAX1619_REG_R_REMOTE_CRIT,
|
|
[t_hyst2] = MAX1619_REG_R_TCRIT_HYST,
|
|
};
|
|
|
|
static const u8 regs_write[t_num_regs] = {
|
|
[t_low2] = MAX1619_REG_W_REMOTE_LOW,
|
|
[t_high2] = MAX1619_REG_W_REMOTE_HIGH,
|
|
[t_crit2] = MAX1619_REG_W_REMOTE_CRIT,
|
|
[t_hyst2] = MAX1619_REG_W_TCRIT_HYST,
|
|
};
|
|
|
|
static struct max1619_data *max1619_update_device(struct device *dev)
|
|
{
|
|
struct max1619_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
int config, i;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
|
|
dev_dbg(&client->dev, "Updating max1619 data.\n");
|
|
for (i = 0; i < t_num_regs; i++)
|
|
data->temp[i] = i2c_smbus_read_byte_data(client,
|
|
regs_read[i]);
|
|
data->alarms = i2c_smbus_read_byte_data(client,
|
|
MAX1619_REG_R_STATUS);
|
|
/* If OVERT polarity is low, reverse alarm bit */
|
|
config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
|
|
if (!(config & 0x20))
|
|
data->alarms ^= 0x02;
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
/*
|
|
* Sysfs stuff
|
|
*/
|
|
|
|
static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
struct max1619_data *data = max1619_update_device(dev);
|
|
|
|
return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
|
|
}
|
|
|
|
static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
struct max1619_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
long val;
|
|
int err = kstrtol(buf, 10, &val);
|
|
if (err)
|
|
return err;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
data->temp[attr->index] = temp_to_reg(val);
|
|
i2c_smbus_write_byte_data(client, regs_write[attr->index],
|
|
data->temp[attr->index]);
|
|
mutex_unlock(&data->update_lock);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct max1619_data *data = max1619_update_device(dev);
|
|
return sprintf(buf, "%d\n", data->alarms);
|
|
}
|
|
|
|
static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
int bitnr = to_sensor_dev_attr(attr)->index;
|
|
struct max1619_data *data = max1619_update_device(dev);
|
|
return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, t_input1);
|
|
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, t_input2);
|
|
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp, set_temp,
|
|
t_low2);
|
|
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp, set_temp,
|
|
t_high2);
|
|
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp, set_temp,
|
|
t_crit2);
|
|
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp,
|
|
set_temp, t_hyst2);
|
|
|
|
static DEVICE_ATTR_RO(alarms);
|
|
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
|
|
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
|
|
static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
|
|
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
|
|
|
|
static struct attribute *max1619_attrs[] = {
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_min.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
|
|
|
|
&dev_attr_alarms.attr,
|
|
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_fault.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(max1619);
|
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */
|
|
static int max1619_detect(struct i2c_client *client,
|
|
struct i2c_board_info *info)
|
|
{
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
u8 reg_config, reg_convrate, reg_status, man_id, chip_id;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -ENODEV;
|
|
|
|
/* detection */
|
|
reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
|
|
reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE);
|
|
reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS);
|
|
if ((reg_config & 0x03) != 0x00
|
|
|| reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) {
|
|
dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n",
|
|
client->addr);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* identification */
|
|
man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID);
|
|
chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID);
|
|
if (man_id != 0x4D || chip_id != 0x04) {
|
|
dev_info(&adapter->dev,
|
|
"Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n",
|
|
man_id, chip_id);
|
|
return -ENODEV;
|
|
}
|
|
|
|
strlcpy(info->type, "max1619", I2C_NAME_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void max1619_init_client(struct i2c_client *client)
|
|
{
|
|
u8 config;
|
|
|
|
/*
|
|
* Start the conversions.
|
|
*/
|
|
i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,
|
|
5); /* 2 Hz */
|
|
config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);
|
|
if (config & 0x40)
|
|
i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,
|
|
config & 0xBF); /* run */
|
|
}
|
|
|
|
static int max1619_probe(struct i2c_client *new_client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct max1619_data *data;
|
|
struct device *hwmon_dev;
|
|
|
|
data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data),
|
|
GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->client = new_client;
|
|
mutex_init(&data->update_lock);
|
|
|
|
/* Initialize the MAX1619 chip */
|
|
max1619_init_client(new_client);
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(&new_client->dev,
|
|
new_client->name,
|
|
data,
|
|
max1619_groups);
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
}
|
|
|
|
static const struct i2c_device_id max1619_id[] = {
|
|
{ "max1619", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max1619_id);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id max1619_of_match[] = {
|
|
{ .compatible = "maxim,max1619", },
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, max1619_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver max1619_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "max1619",
|
|
.of_match_table = of_match_ptr(max1619_of_match),
|
|
},
|
|
.probe = max1619_probe,
|
|
.id_table = max1619_id,
|
|
.detect = max1619_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
module_i2c_driver(max1619_driver);
|
|
|
|
MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>");
|
|
MODULE_DESCRIPTION("MAX1619 sensor driver");
|
|
MODULE_LICENSE("GPL");
|