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linux/drivers/hwmon/pmbus/lm25066.c
Guenter Roeck 3a2805e845 hwmon: (pmbus/lm25066) Ignore byte writes to non-zero pages 
pmbus_clear_faults() attempts to clear faults on non-existing real pages.
As a result, the command error bit in the status register is set, and faults
are not really cleared.

All byte writes to non-zero pages are requests to clear the status register
on that page. Since non-zero pages are virtual and do not exist on the chip,
there is nothing to do, and such requests have to be ignored. This fixes
above problem.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
2011-08-11 10:14:12 -07:00

353 lines
8.6 KiB
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/*
* Hardware monitoring driver for LM25066 / LM5064 / LM5066
*
* 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.
*
* 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 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;
if (page > 1)
return -EINVAL;
/* Map READ_VAUX into READ_VOUT register on page 1 */
if (page == 1) {
switch (reg) {
case PMBUS_READ_VOUT:
ret = pmbus_read_word_data(client, 0,
LM25066_READ_VAUX);
if (ret < 0)
break;
/* Adjust returned value to match VOUT coefficients */
switch (data->id) {
case lm25066:
/* VOUT: 4.54 mV VAUX: 283.2 uV LSB */
ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
break;
case lm5064:
/* VOUT: 4.53 mV VAUX: 700 uV LSB */
ret = DIV_ROUND_CLOSEST(ret * 70, 453);
break;
case lm5066:
/* VOUT: 2.18 mV VAUX: 725 uV LSB */
ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
break;
}
break;
default:
/* No other valid registers on page 1 */
ret = -EINVAL;
break;
}
goto done;
}
switch (reg) {
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;
}
done:
return ret;
}
static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
int ret;
if (page > 1)
return -EINVAL;
switch (reg) {
case PMBUS_IIN_OC_WARN_LIMIT:
ret = pmbus_write_word_data(client, 0,
LM25066_MFR_IIN_OC_WARN_LIMIT,
word);
break;
case PMBUS_PIN_OP_WARN_LIMIT:
ret = pmbus_write_word_data(client, 0,
LM25066_MFR_PIN_OP_WARN_LIMIT,
word);
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_write_byte(struct i2c_client *client, int page, u8 value)
{
if (page > 1)
return -EINVAL;
if (page == 0)
return pmbus_write_byte(client, 0, value);
return 0;
}
static int lm25066_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int config;
int ret;
struct lm25066_data *data;
struct pmbus_driver_info *info;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA))
return -ENODEV;
data = kzalloc(sizeof(struct lm25066_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
if (config < 0) {
ret = config;
goto err_mem;
}
data->id = id->driver_data;
info = &data->info;
info->pages = 2;
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->m[PSC_TEMPERATURE] = 16;
info->b[PSC_TEMPERATURE] = 0;
info->R[PSC_TEMPERATURE] = 0;
info->func[0] = PMBUS_HAVE_VIN | 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->func[1] = PMBUS_HAVE_VOUT;
info->read_word_data = lm25066_read_word_data;
info->write_word_data = lm25066_write_word_data;
info->write_byte = lm25066_write_byte;
switch (id->driver_data) {
case lm25066:
info->m[PSC_VOLTAGE_IN] = 22070;
info->b[PSC_VOLTAGE_IN] = 0;
info->R[PSC_VOLTAGE_IN] = -2;
info->m[PSC_VOLTAGE_OUT] = 22070;
info->b[PSC_VOLTAGE_OUT] = 0;
info->R[PSC_VOLTAGE_OUT] = -2;
if (config & LM25066_DEV_SETUP_CL) {
info->m[PSC_CURRENT_IN] = 6852;
info->b[PSC_CURRENT_IN] = 0;
info->R[PSC_CURRENT_IN] = -2;
info->m[PSC_POWER] = 369;
info->b[PSC_POWER] = 0;
info->R[PSC_POWER] = -2;
} else {
info->m[PSC_CURRENT_IN] = 13661;
info->b[PSC_CURRENT_IN] = 0;
info->R[PSC_CURRENT_IN] = -2;
info->m[PSC_POWER] = 736;
info->b[PSC_POWER] = 0;
info->R[PSC_POWER] = -2;
}
break;
case lm5064:
info->m[PSC_VOLTAGE_IN] = 22075;
info->b[PSC_VOLTAGE_IN] = 0;
info->R[PSC_VOLTAGE_IN] = -2;
info->m[PSC_VOLTAGE_OUT] = 22075;
info->b[PSC_VOLTAGE_OUT] = 0;
info->R[PSC_VOLTAGE_OUT] = -2;
if (config & LM25066_DEV_SETUP_CL) {
info->m[PSC_CURRENT_IN] = 6713;
info->b[PSC_CURRENT_IN] = 0;
info->R[PSC_CURRENT_IN] = -2;
info->m[PSC_POWER] = 3619;
info->b[PSC_POWER] = 0;
info->R[PSC_POWER] = -3;
} else {
info->m[PSC_CURRENT_IN] = 13426;
info->b[PSC_CURRENT_IN] = 0;
info->R[PSC_CURRENT_IN] = -2;
info->m[PSC_POWER] = 7238;
info->b[PSC_POWER] = 0;
info->R[PSC_POWER] = -3;
}
break;
case lm5066:
info->m[PSC_VOLTAGE_IN] = 4587;
info->b[PSC_VOLTAGE_IN] = 0;
info->R[PSC_VOLTAGE_IN] = -2;
info->m[PSC_VOLTAGE_OUT] = 4587;
info->b[PSC_VOLTAGE_OUT] = 0;
info->R[PSC_VOLTAGE_OUT] = -2;
if (config & LM25066_DEV_SETUP_CL) {
info->m[PSC_CURRENT_IN] = 10753;
info->b[PSC_CURRENT_IN] = 0;
info->R[PSC_CURRENT_IN] = -2;
info->m[PSC_POWER] = 1204;
info->b[PSC_POWER] = 0;
info->R[PSC_POWER] = -3;
} else {
info->m[PSC_CURRENT_IN] = 5405;
info->b[PSC_CURRENT_IN] = 0;
info->R[PSC_CURRENT_IN] = -2;
info->m[PSC_POWER] = 605;
info->b[PSC_POWER] = 0;
info->R[PSC_POWER] = -3;
}
break;
default:
ret = -ENODEV;
goto err_mem;
}
ret = pmbus_do_probe(client, id, info);
if (ret)
goto err_mem;
return 0;
err_mem:
kfree(data);
return ret;
}
static int lm25066_remove(struct i2c_client *client)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
const struct lm25066_data *data = to_lm25066_data(info);
int ret;
ret = pmbus_do_remove(client);
kfree(data);
return ret;
}
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 = lm25066_remove,
.id_table = lm25066_id,
};
static int __init lm25066_init(void)
{
return i2c_add_driver(&lm25066_driver);
}
static void __exit lm25066_exit(void)
{
i2c_del_driver(&lm25066_driver);
}
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for LM25066/LM5064/LM5066");
MODULE_LICENSE("GPL");
module_init(lm25066_init);
module_exit(lm25066_exit);
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