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/*
* Hardware monitoring driver for LM25066 / LM5064 / LM5066
*
* Copyright (c) 2011 Ericsson AB.
* Copyright (c) 2013 Guenter Roeck
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#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"
enum chips { lm25066, lm5064, lm5066 };
#define LM25066_READ_VAUX 0xd0
#define LM25066_MFR_READ_IIN 0xd1
#define LM25066_MFR_READ_PIN 0xd2
#define LM25066_MFR_IIN_OC_WARN_LIMIT 0xd3
#define LM25066_MFR_PIN_OP_WARN_LIMIT 0xd4
#define LM25066_READ_PIN_PEAK 0xd5
#define LM25066_CLEAR_PIN_PEAK 0xd6
#define LM25066_DEVICE_SETUP 0xd9
#define LM25066_READ_AVG_VIN 0xdc
#define LM25066_READ_AVG_VOUT 0xdd
#define LM25066_READ_AVG_IIN 0xde
#define LM25066_READ_AVG_PIN 0xdf
#define LM25066_DEV_SETUP_CL (1 << 4) /* Current limit */
struct __coeff {
short m, b, R;
};
#define PSC_CURRENT_IN_L (PSC_NUM_CLASSES)
#define PSC_POWER_L (PSC_NUM_CLASSES + 1)
static struct __coeff lm25066_coeff[3][PSC_NUM_CLASSES + 2] = {
[lm25066] = {
[PSC_VOLTAGE_IN] = {
.m = 22070,
.R = -2,
},
[PSC_VOLTAGE_OUT] = {
.m = 22070,
.R = -2,
},
[PSC_CURRENT_IN] = {
.m = 13661,
.R = -2,
},
[PSC_CURRENT_IN_L] = {
.m = 6852,
.R = -2,
},
[PSC_POWER] = {
.m = 736,
.R = -2,
},
[PSC_POWER_L] = {
.m = 369,
.R = -2,
},
[PSC_TEMPERATURE] = {
.m = 16,
},
},
[lm5064] = {
[PSC_VOLTAGE_IN] = {
.m = 4611,
.R = -2,
},
[PSC_VOLTAGE_OUT] = {
.m = 4621,
.R = -2,
},
[PSC_CURRENT_IN] = {
.m = 10742,
.R = -2,
},
[PSC_CURRENT_IN_L] = {
.m = 5456,
.R = -2,
},
[PSC_POWER] = {
.m = 1204,
.R = -3,
},
[PSC_POWER_L] = {
.m = 612,
.R = -3,
},
[PSC_TEMPERATURE] = {
.m = 16,
},
},
[lm5066] = {
[PSC_VOLTAGE_IN] = {
.m = 4587,
.R = -2,
},
[PSC_VOLTAGE_OUT] = {
.m = 4587,
.R = -2,
},
[PSC_CURRENT_IN] = {
.m = 10753,
.R = -2,
},
[PSC_CURRENT_IN_L] = {
.m = 5405,
.R = -2,
},
[PSC_POWER] = {
.m = 1204,
.R = -3,
},
[PSC_POWER_L] = {
.m = 605,
.R = -3,
},
[PSC_TEMPERATURE] = {
.m = 16,
},
},
};
struct lm25066_data {
int id;
struct pmbus_driver_info info;
};
#define to_lm25066_data(x) container_of(x, struct lm25066_data, info)
static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
const struct lm25066_data *data = to_lm25066_data(info);
int ret;
switch (reg) {
case PMBUS_VIRT_READ_VMON:
ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX);
if (ret < 0)
break;
/* Adjust returned value to match VIN coefficients */
switch (data->id) {
case lm25066:
/* VIN: 4.54 mV VAUX: 283.2 uV LSB */
ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
break;
case lm5064:
/* VIN: 4.53 mV VAUX: 700 uV LSB */
ret = DIV_ROUND_CLOSEST(ret * 70, 453);
break;
case lm5066:
/* VIN: 2.18 mV VAUX: 725 uV LSB */
ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
break;
}
break;
case PMBUS_READ_IIN:
ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
break;
case PMBUS_READ_PIN:
ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
break;
case PMBUS_IIN_OC_WARN_LIMIT:
ret = pmbus_read_word_data(client, 0,
LM25066_MFR_IIN_OC_WARN_LIMIT);
break;
case PMBUS_PIN_OP_WARN_LIMIT:
ret = pmbus_read_word_data(client, 0,
LM25066_MFR_PIN_OP_WARN_LIMIT);
break;
case PMBUS_VIRT_READ_VIN_AVG:
ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
break;
case PMBUS_VIRT_READ_VOUT_AVG:
ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
break;
case PMBUS_VIRT_READ_IIN_AVG:
ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
break;
case PMBUS_VIRT_READ_PIN_AVG:
ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
break;
case PMBUS_VIRT_READ_PIN_MAX:
ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
break;
case PMBUS_VIRT_RESET_PIN_HISTORY:
ret = 0;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
int ret;
switch (reg) {
case PMBUS_VOUT_UV_WARN_LIMIT:
case PMBUS_OT_FAULT_LIMIT:
case PMBUS_OT_WARN_LIMIT:
case PMBUS_VIN_UV_WARN_LIMIT:
case PMBUS_VIN_OV_WARN_LIMIT:
word = ((s16)word < 0) ? 0 : clamp_val(word, 0, 0x0fff);
ret = pmbus_write_word_data(client, 0, reg, word);
pmbus_clear_cache(client);
break;
case PMBUS_IIN_OC_WARN_LIMIT:
word = ((s16)word < 0) ? 0 : clamp_val(word, 0, 0x0fff);
ret = pmbus_write_word_data(client, 0,
LM25066_MFR_IIN_OC_WARN_LIMIT,
word);
pmbus_clear_cache(client);
break;
case PMBUS_PIN_OP_WARN_LIMIT:
word = ((s16)word < 0) ? 0 : clamp_val(word, 0, 0x0fff);
ret = pmbus_write_word_data(client, 0,
LM25066_MFR_PIN_OP_WARN_LIMIT,
word);
pmbus_clear_cache(client);
break;
case PMBUS_VIRT_RESET_PIN_HISTORY:
ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int lm25066_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int config;
struct lm25066_data *data;
struct pmbus_driver_info *info;
struct __coeff *coeff;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA))
return -ENODEV;
data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
if (config < 0)
return config;
data->id = id->driver_data;
info = &data->info;
info->pages = 1;
info->format[PSC_VOLTAGE_IN] = direct;
info->format[PSC_VOLTAGE_OUT] = direct;
info->format[PSC_CURRENT_IN] = direct;
info->format[PSC_TEMPERATURE] = direct;
info->format[PSC_POWER] = direct;
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON | PMBUS_HAVE_VOUT
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
info->read_word_data = lm25066_read_word_data;
info->write_word_data = lm25066_write_word_data;
coeff = &lm25066_coeff[data->id][0];
info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
info->b[PSC_POWER] = coeff[PSC_POWER].b;
info->R[PSC_POWER] = coeff[PSC_POWER].R;
if (config & LM25066_DEV_SETUP_CL) {
info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
} else {
info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
info->m[PSC_POWER] = coeff[PSC_POWER].m;
}
return pmbus_do_probe(client, id, info);
}
static const struct i2c_device_id lm25066_id[] = {
{"lm25066", lm25066},
{"lm5064", lm5064},
{"lm5066", lm5066},
{ }
};
MODULE_DEVICE_TABLE(i2c, lm25066_id);
/* This is the driver that will be inserted */
static struct i2c_driver lm25066_driver = {
.driver = {
.name = "lm25066",
},
.probe = lm25066_probe,
.remove = pmbus_do_remove,
.id_table = lm25066_id,
};
module_i2c_driver(lm25066_driver);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for LM25066/LM5064/LM5066");
MODULE_LICENSE("GPL");
|
