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hwmon: (pmbus) Add tps40422 front-end driver

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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 <[email protected]>
[Guenter Roeck: Dropped unnecessary license text (fixes checkpatch warning)]
Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
Zhu, Richard \(NSN - CN/Beijing\) 2014-07-01 07:14:23 +00:00 • committed by Guenter Roeck
commit a8bfeceb0c
6 changed files with 142 additions and 6 deletions
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5
Documentation/hwmon/pmbus
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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: -

64
Documentation/hwmon/tps40422 Normal file
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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 <[email protected]>
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.