hwmon: (pmbus) Add tps40422 front-end driver

For TI power management chip TPS40422, READ_TEMPERATURE_2 command is supported on
page 1 of the chip, but the original driver(pmbus.c) only tried to detect this command
on page 0, this will lead to a result that the temperature sensor in page 1 couldn't
be detected. This change is to isolate the tps40422 driver from pmbus.c into a solo
front-end driver.

Signed-off-by: Zhu Laiwen <richard.zhu@nsn.com>
[Guenter Roeck: Dropped unnecessary license text (fixes checkpatch warning)]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Zhu, Richard \(NSN - CN/Beijing\) 2014-07-01 07:14:23 +00:00 committed by Guenter Roeck
parent 012cb5e257
commit a8bfeceb0c
6 changed files with 142 additions and 6 deletions

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@ -23,12 +23,11 @@ Supported chips:
http://www.lineagepower.com/oem/pdf/PDT012A0X.pdf
http://www.lineagepower.com/oem/pdf/UDT020A0X.pdf
http://www.lineagepower.com/oem/pdf/MDT040A0X.pdf
* Texas Instruments TPS40400, TPS40422
Prefixes: 'tps40400', 'tps40422'
* Texas Instruments TPS40400
Prefixes: 'tps40400'
Addresses scanned: -
Datasheets:
http://www.ti.com/lit/gpn/tps40400
http://www.ti.com/lit/gpn/tps40422
* Generic PMBus devices
Prefix: 'pmbus'
Addresses scanned: -

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@ -0,0 +1,64 @@
Kernel driver tps40422
======================
Supported chips:
* TI TPS40422
Prefix: 'tps40422'
Addresses scanned: -
Datasheet: http://www.ti.com/lit/gpn/tps40422
Author: Zhu Laiwen <richard.zhu@nsn.com>
Description
-----------
This driver supports TI TPS40422 Dual-Output or Two-Phase Synchronous Buck
Controller with PMBus
The driver is a client driver to the core PMBus driver.
Please see Documentation/hwmon/pmbus for details on PMBus client drivers.
Usage Notes
-----------
This driver does not auto-detect devices. You will have to instantiate the
devices explicitly. Please see Documentation/i2c/instantiating-devices for
details.
Platform data support
---------------------
The driver supports standard PMBus driver platform data.
Sysfs entries
-------------
The following attributes are supported.
in[1-2]_label "vout[1-2]"
in[1-2]_input Measured voltage. From READ_VOUT register.
in[1-2]_alarm voltage alarm.
curr[1-2]_input Measured current. From READ_IOUT register.
curr[1-2]_label "iout[1-2]"
curr1_max Maximum current. From IOUT_OC_WARN_LIMIT register.
curr1_crit Critical maximum current. From IOUT_OC_FAULT_LIMIT register.
curr1_max_alarm Current high alarm. From IOUT_OC_WARN_LIMIT status.
curr1_crit_alarm Current critical high alarm. From IOUT_OC_FAULT status.
curr2_alarm Current high alarm. From IOUT_OC_WARNING status.
temp1_input Measured temperature. From READ_TEMPERATURE_2 register on page 0.
temp1_max Maximum temperature. From OT_WARN_LIMIT register.
temp1_crit Critical high temperature. From OT_FAULT_LIMIT register.
temp1_max_alarm Chip temperature high alarm. Set by comparing
READ_TEMPERATURE_2 on page 0 with OT_WARN_LIMIT if TEMP_OT_WARNING
status is set.
temp1_crit_alarm Chip temperature critical high alarm. Set by comparing
READ_TEMPERATURE_2 on page 0 with OT_FAULT_LIMIT if TEMP_OT_FAULT
status is set.
temp2_input Measured temperature. From READ_TEMPERATURE_2 register on page 1.
temp2_alarm Chip temperature alarm on page 1.

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@ -20,8 +20,7 @@ config SENSORS_PMBUS
help
If you say yes here you get hardware monitoring support for generic
PMBus devices, including but not limited to ADP4000, BMR453, BMR454,
MDT040, NCP4200, NCP4208, PDT003, PDT006, PDT012, UDT020, TPS40400,
and TPS40422.
MDT040, NCP4200, NCP4208, PDT003, PDT006, PDT012, UDT020, and TPS40400.
This driver can also be built as a module. If so, the module will
be called pmbus.
@ -87,6 +86,16 @@ config SENSORS_MAX8688
This driver can also be built as a module. If so, the module will
be called max8688.
config SENSORS_TPS40422
tristate "TI TPS40422"
default n
help
If you say yes here you get hardware monitoring support for TI
TPS40422.
This driver can also be built as a module. If so, the module will
be called tps40422.
config SENSORS_UCD9000
tristate "TI UCD90120, UCD90124, UCD9090, UCD90910"
default n

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@ -10,6 +10,7 @@ obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o
obj-$(CONFIG_SENSORS_UCD9000) += ucd9000.o
obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o
obj-$(CONFIG_SENSORS_ZL6100) += zl6100.o

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@ -193,7 +193,6 @@ static const struct i2c_device_id pmbus_id[] = {
{"pdt012", 1},
{"pmbus", 0},
{"tps40400", 1},
{"tps40422", 2},
{"udt020", 1},
{}
};

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@ -0,0 +1,64 @@
/*
* Hardware monitoring driver for TI TPS40422
*
* Copyright (c) 2014 Nokia Solutions and Networks.
*
* 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/i2c.h>
#include "pmbus.h"
static struct pmbus_driver_info tps40422_info = {
.pages = 2,
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = linear,
.format[PSC_TEMPERATURE] = linear,
.func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP2
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP2
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT,
};
static int tps40422_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
return pmbus_do_probe(client, id, &tps40422_info);
}
static const struct i2c_device_id tps40422_id[] = {
{"tps40422", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, tps40422_id);
/* This is the driver that will be inserted */
static struct i2c_driver tps40422_driver = {
.driver = {
.name = "tps40422",
},
.probe = tps40422_probe,
.remove = pmbus_do_remove,
.id_table = tps40422_id,
};
module_i2c_driver(tps40422_driver);
MODULE_AUTHOR("Zhu Laiwen <richard.zhu@nsn.com>");
MODULE_DESCRIPTION("PMBus driver for TI TPS40422");
MODULE_LICENSE("GPL");