mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
08f411bcb5
The ir35221 datasheet describes specific scaling factors for a number of commands which the current driver applies when reading. However now that the ir35221 has been tested on machines with more easily verifiable readings these descriptions have turned out to be superfluous and reading each command according to the linear format is sufficient. Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
/*
|
|
* Hardware monitoring driver for IR35221
|
|
*
|
|
* Copyright (C) IBM Corporation 2017.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include "pmbus.h"
|
|
|
|
#define IR35221_MFR_VIN_PEAK 0xc5
|
|
#define IR35221_MFR_VOUT_PEAK 0xc6
|
|
#define IR35221_MFR_IOUT_PEAK 0xc7
|
|
#define IR35221_MFR_TEMP_PEAK 0xc8
|
|
#define IR35221_MFR_VIN_VALLEY 0xc9
|
|
#define IR35221_MFR_VOUT_VALLEY 0xca
|
|
#define IR35221_MFR_IOUT_VALLEY 0xcb
|
|
#define IR35221_MFR_TEMP_VALLEY 0xcc
|
|
|
|
static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
int ret;
|
|
|
|
switch (reg) {
|
|
case PMBUS_VIRT_READ_VIN_MAX:
|
|
ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK);
|
|
break;
|
|
case PMBUS_VIRT_READ_VOUT_MAX:
|
|
ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK);
|
|
break;
|
|
case PMBUS_VIRT_READ_IOUT_MAX:
|
|
ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK);
|
|
break;
|
|
case PMBUS_VIRT_READ_TEMP_MAX:
|
|
ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK);
|
|
break;
|
|
case PMBUS_VIRT_READ_VIN_MIN:
|
|
ret = pmbus_read_word_data(client, page,
|
|
IR35221_MFR_VIN_VALLEY);
|
|
break;
|
|
case PMBUS_VIRT_READ_VOUT_MIN:
|
|
ret = pmbus_read_word_data(client, page,
|
|
IR35221_MFR_VOUT_VALLEY);
|
|
break;
|
|
case PMBUS_VIRT_READ_IOUT_MIN:
|
|
ret = pmbus_read_word_data(client, page,
|
|
IR35221_MFR_IOUT_VALLEY);
|
|
break;
|
|
case PMBUS_VIRT_READ_TEMP_MIN:
|
|
ret = pmbus_read_word_data(client, page,
|
|
IR35221_MFR_TEMP_VALLEY);
|
|
break;
|
|
default:
|
|
ret = -ENODATA;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ir35221_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct pmbus_driver_info *info;
|
|
u8 buf[I2C_SMBUS_BLOCK_MAX];
|
|
int ret;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_READ_BYTE_DATA
|
|
| I2C_FUNC_SMBUS_READ_WORD_DATA
|
|
| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
|
|
return -ENODEV;
|
|
|
|
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
|
|
return ret;
|
|
}
|
|
if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
|
|
dev_err(&client->dev, "MFR_ID unrecognised\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
|
|
return ret;
|
|
}
|
|
if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
|
|
dev_err(&client->dev, "MFR_MODEL unrecognised\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
|
|
GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
info->read_word_data = ir35221_read_word_data;
|
|
|
|
info->pages = 2;
|
|
info->format[PSC_VOLTAGE_IN] = linear;
|
|
info->format[PSC_VOLTAGE_OUT] = linear;
|
|
info->format[PSC_CURRENT_IN] = linear;
|
|
info->format[PSC_CURRENT_OUT] = linear;
|
|
info->format[PSC_POWER] = linear;
|
|
info->format[PSC_TEMPERATURE] = linear;
|
|
|
|
info->func[0] = PMBUS_HAVE_VIN
|
|
| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
|
|
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
|
|
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
|
|
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
|
|
info->func[1] = info->func[0];
|
|
|
|
return pmbus_do_probe(client, id, info);
|
|
}
|
|
|
|
static const struct i2c_device_id ir35221_id[] = {
|
|
{"ir35221", 0},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, ir35221_id);
|
|
|
|
static struct i2c_driver ir35221_driver = {
|
|
.driver = {
|
|
.name = "ir35221",
|
|
},
|
|
.probe = ir35221_probe,
|
|
.remove = pmbus_do_remove,
|
|
.id_table = ir35221_id,
|
|
};
|
|
|
|
module_i2c_driver(ir35221_driver);
|
|
|
|
MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
|
|
MODULE_DESCRIPTION("PMBus driver for IR35221");
|
|
MODULE_LICENSE("GPL");
|