238 lines
6.7 KiB
C
238 lines
6.7 KiB
C
/*
|
|
* Hardware monitoring driver for PMBus devices
|
|
*
|
|
* Copyright (c) 2010, 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/mutex.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/pmbus.h>
|
|
#include "pmbus.h"
|
|
|
|
/*
|
|
* Find sensor groups and status registers on each page.
|
|
*/
|
|
static void pmbus_find_sensor_groups(struct i2c_client *client,
|
|
struct pmbus_driver_info *info)
|
|
{
|
|
int page;
|
|
|
|
/* Sensors detected on page 0 only */
|
|
if (pmbus_check_word_register(client, 0, PMBUS_READ_VIN))
|
|
info->func[0] |= PMBUS_HAVE_VIN;
|
|
if (pmbus_check_word_register(client, 0, PMBUS_READ_VCAP))
|
|
info->func[0] |= PMBUS_HAVE_VCAP;
|
|
if (pmbus_check_word_register(client, 0, PMBUS_READ_IIN))
|
|
info->func[0] |= PMBUS_HAVE_IIN;
|
|
if (pmbus_check_word_register(client, 0, PMBUS_READ_PIN))
|
|
info->func[0] |= PMBUS_HAVE_PIN;
|
|
if (info->func[0]
|
|
&& pmbus_check_byte_register(client, 0, PMBUS_STATUS_INPUT))
|
|
info->func[0] |= PMBUS_HAVE_STATUS_INPUT;
|
|
if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_12) &&
|
|
pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_1)) {
|
|
info->func[0] |= PMBUS_HAVE_FAN12;
|
|
if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_12))
|
|
info->func[0] |= PMBUS_HAVE_STATUS_FAN12;
|
|
}
|
|
if (pmbus_check_byte_register(client, 0, PMBUS_FAN_CONFIG_34) &&
|
|
pmbus_check_word_register(client, 0, PMBUS_READ_FAN_SPEED_3)) {
|
|
info->func[0] |= PMBUS_HAVE_FAN34;
|
|
if (pmbus_check_byte_register(client, 0, PMBUS_STATUS_FAN_34))
|
|
info->func[0] |= PMBUS_HAVE_STATUS_FAN34;
|
|
}
|
|
if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_1))
|
|
info->func[0] |= PMBUS_HAVE_TEMP;
|
|
if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_2))
|
|
info->func[0] |= PMBUS_HAVE_TEMP2;
|
|
if (pmbus_check_word_register(client, 0, PMBUS_READ_TEMPERATURE_3))
|
|
info->func[0] |= PMBUS_HAVE_TEMP3;
|
|
if (info->func[0] & (PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2
|
|
| PMBUS_HAVE_TEMP3)
|
|
&& pmbus_check_byte_register(client, 0,
|
|
PMBUS_STATUS_TEMPERATURE))
|
|
info->func[0] |= PMBUS_HAVE_STATUS_TEMP;
|
|
|
|
/* Sensors detected on all pages */
|
|
for (page = 0; page < info->pages; page++) {
|
|
if (pmbus_check_word_register(client, page, PMBUS_READ_VOUT)) {
|
|
info->func[page] |= PMBUS_HAVE_VOUT;
|
|
if (pmbus_check_byte_register(client, page,
|
|
PMBUS_STATUS_VOUT))
|
|
info->func[page] |= PMBUS_HAVE_STATUS_VOUT;
|
|
}
|
|
if (pmbus_check_word_register(client, page, PMBUS_READ_IOUT)) {
|
|
info->func[page] |= PMBUS_HAVE_IOUT;
|
|
if (pmbus_check_byte_register(client, 0,
|
|
PMBUS_STATUS_IOUT))
|
|
info->func[page] |= PMBUS_HAVE_STATUS_IOUT;
|
|
}
|
|
if (pmbus_check_word_register(client, page, PMBUS_READ_POUT))
|
|
info->func[page] |= PMBUS_HAVE_POUT;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Identify chip parameters.
|
|
*/
|
|
static int pmbus_identify(struct i2c_client *client,
|
|
struct pmbus_driver_info *info)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!info->pages) {
|
|
/*
|
|
* Check if the PAGE command is supported. If it is,
|
|
* keep setting the page number until it fails or until the
|
|
* maximum number of pages has been reached. Assume that
|
|
* this is the number of pages supported by the chip.
|
|
*/
|
|
if (pmbus_check_byte_register(client, 0, PMBUS_PAGE)) {
|
|
int page;
|
|
|
|
for (page = 1; page < PMBUS_PAGES; page++) {
|
|
if (pmbus_set_page(client, page) < 0)
|
|
break;
|
|
}
|
|
pmbus_set_page(client, 0);
|
|
info->pages = page;
|
|
} else {
|
|
info->pages = 1;
|
|
}
|
|
}
|
|
|
|
if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) {
|
|
int vout_mode;
|
|
|
|
vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
|
|
if (vout_mode >= 0 && vout_mode != 0xff) {
|
|
switch (vout_mode >> 5) {
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
info->format[PSC_VOLTAGE_OUT] = vid;
|
|
info->vrm_version = vr11;
|
|
break;
|
|
case 2:
|
|
info->format[PSC_VOLTAGE_OUT] = direct;
|
|
break;
|
|
default:
|
|
ret = -ENODEV;
|
|
goto abort;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We should check if the COEFFICIENTS register is supported.
|
|
* If it is, and the chip is configured for direct mode, we can read
|
|
* the coefficients from the chip, one set per group of sensor
|
|
* registers.
|
|
*
|
|
* To do this, we will need access to a chip which actually supports the
|
|
* COEFFICIENTS command, since the command is too complex to implement
|
|
* without testing it. Until then, abort if a chip configured for direct
|
|
* mode was detected.
|
|
*/
|
|
if (info->format[PSC_VOLTAGE_OUT] == direct) {
|
|
ret = -ENODEV;
|
|
goto abort;
|
|
}
|
|
|
|
/* Try to find sensor groups */
|
|
pmbus_find_sensor_groups(client, info);
|
|
abort:
|
|
return ret;
|
|
}
|
|
|
|
static int pmbus_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct pmbus_driver_info *info;
|
|
struct pmbus_platform_data *pdata = NULL;
|
|
struct device *dev = &client->dev;
|
|
|
|
info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
if (!strcmp(id->name, "dps460") || !strcmp(id->name, "dps800") ||
|
|
!strcmp(id->name, "sgd009")) {
|
|
pdata = devm_kzalloc(dev, sizeof(struct pmbus_platform_data),
|
|
GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
|
|
pdata->flags = PMBUS_SKIP_STATUS_CHECK;
|
|
}
|
|
|
|
info->pages = id->driver_data;
|
|
info->identify = pmbus_identify;
|
|
dev->platform_data = pdata;
|
|
|
|
return pmbus_do_probe(client, id, info);
|
|
}
|
|
|
|
/*
|
|
* Use driver_data to set the number of pages supported by the chip.
|
|
*/
|
|
static const struct i2c_device_id pmbus_id[] = {
|
|
{"adp4000", 1},
|
|
{"bmr453", 1},
|
|
{"bmr454", 1},
|
|
{"dps460", 1},
|
|
{"dps800", 1},
|
|
{"mdt040", 1},
|
|
{"ncp4200", 1},
|
|
{"ncp4208", 1},
|
|
{"pdt003", 1},
|
|
{"pdt006", 1},
|
|
{"pdt012", 1},
|
|
{"pmbus", 0},
|
|
{"sgd009", 1},
|
|
{"tps40400", 1},
|
|
{"tps544b20", 1},
|
|
{"tps544b25", 1},
|
|
{"tps544c20", 1},
|
|
{"tps544c25", 1},
|
|
{"udt020", 1},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, pmbus_id);
|
|
|
|
/* This is the driver that will be inserted */
|
|
static struct i2c_driver pmbus_driver = {
|
|
.driver = {
|
|
.name = "pmbus",
|
|
},
|
|
.probe = pmbus_probe,
|
|
.remove = pmbus_do_remove,
|
|
.id_table = pmbus_id,
|
|
};
|
|
|
|
module_i2c_driver(pmbus_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck");
|
|
MODULE_DESCRIPTION("Generic PMBus driver");
|
|
MODULE_LICENSE("GPL");
|