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/*
* Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
* and Digital Power Monitor
*
* Copyright (c) 2011 Ericsson AB.
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include "pmbus.h"
#define ADM1275_PEAK_IOUT 0xd0
#define ADM1275_PEAK_VIN 0xd1
#define ADM1275_PEAK_VOUT 0xd2
#define ADM1275_PMON_CONFIG 0xd4
#define ADM1275_VIN_VOUT_SELECT (1 << 6)
#define ADM1275_VRANGE (1 << 5)
static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
{
int ret;
if (page)
return -EINVAL;
switch (reg) {
case PMBUS_VIRT_READ_IOUT_MAX:
ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
break;
case PMBUS_VIRT_READ_VOUT_MAX:
ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
break;
case PMBUS_VIRT_READ_VIN_MAX:
ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
case PMBUS_VIRT_RESET_VOUT_HISTORY:
case PMBUS_VIRT_RESET_VIN_HISTORY:
ret = 0;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
int ret;
if (page)
return -EINVAL;
switch (reg) {
case PMBUS_VIRT_RESET_IOUT_HISTORY:
ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
break;
case PMBUS_VIRT_RESET_VOUT_HISTORY:
ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
break;
case PMBUS_VIRT_RESET_VIN_HISTORY:
ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int adm1275_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int config;
int ret;
struct pmbus_driver_info *info;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA))
return -ENODEV;
info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
if (config < 0) {
ret = config;
goto err_mem;
}
info->pages = 1;
info->format[PSC_VOLTAGE_IN] = direct;
info->format[PSC_VOLTAGE_OUT] = direct;
info->format[PSC_CURRENT_OUT] = direct;
info->m[PSC_CURRENT_OUT] = 807;
info->b[PSC_CURRENT_OUT] = 20475;
info->R[PSC_CURRENT_OUT] = -1;
info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
info->read_word_data = adm1275_read_word_data;
info->write_word_data = adm1275_write_word_data;
if (config & ADM1275_VRANGE) {
info->m[PSC_VOLTAGE_IN] = 19199;
info->b[PSC_VOLTAGE_IN] = 0;
info->R[PSC_VOLTAGE_IN] = -2;
info->m[PSC_VOLTAGE_OUT] = 19199;
info->b[PSC_VOLTAGE_OUT] = 0;
info->R[PSC_VOLTAGE_OUT] = -2;
} else {
info->m[PSC_VOLTAGE_IN] = 6720;
info->b[PSC_VOLTAGE_IN] = 0;
info->R[PSC_VOLTAGE_IN] = -1;
info->m[PSC_VOLTAGE_OUT] = 6720;
info->b[PSC_VOLTAGE_OUT] = 0;
info->R[PSC_VOLTAGE_OUT] = -1;
}
if (config & ADM1275_VIN_VOUT_SELECT)
info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
else
info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
ret = pmbus_do_probe(client, id, info);
if (ret)
goto err_mem;
return 0;
err_mem:
kfree(info);
return ret;
}
static int adm1275_remove(struct i2c_client *client)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
int ret;
ret = pmbus_do_remove(client);
kfree(info);
return ret;
}
static const struct i2c_device_id adm1275_id[] = {
{"adm1275", 0},
{ }
};
MODULE_DEVICE_TABLE(i2c, adm1275_id);
static struct i2c_driver adm1275_driver = {
.driver = {
.name = "adm1275",
},
.probe = adm1275_probe,
.remove = adm1275_remove,
.id_table = adm1275_id,
};
static int __init adm1275_init(void)
{
return i2c_add_driver(&adm1275_driver);
}
static void __exit adm1275_exit(void)
{
i2c_del_driver(&adm1275_driver);
}
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275");
MODULE_LICENSE("GPL");
module_init(adm1275_init);
module_exit(adm1275_exit);
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