xref: /freebsd/share/man/man9/regulator.9 (revision b25ff2b9d340f0a4c99ec4ba64e22fb67945aba3)

.\" Copyright (c) 2021 Emmanuel Vadot <manu@freebsd.org>
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd June 14, 2021
.Dt REGULATOR 9
.Os
.Sh NAME
.Nm regulator ,
.Nm regulator_get_by_name ,
.Nm regulator_get_by_id ,
.Nm regulator_release ,
.Nm regulator_get_name ,
.Nm regulator_enable ,
.Nm regulator_disable ,
.Nm regulator_stop ,
.Nm regulator_status ,
.Nm regulator_get_voltage ,
.Nm regulator_set_voltage ,
.Nm regulator_check_voltage ,
.Nm regulator_get_by_ofw_property
.Nd regulator methods
.Sh SYNOPSIS
.Cd "device regulator"
.In "dev/extres/regulator/regulator.h"
.Ft int
.Fn regulator_get_by_name "device_t cdev" "const char *name" "regulator_t *regulator"
.Ft int
.Fn regulator_get_by_id "device_t cdev" "device_t pdev" "intptr_t id" "regulator_t *regulator"
.Ft int
.Fn regulator_release "regulator_t regulator"
.Ft int
.Fn regulator_get_name "regulator_t regulator"
.Ft int
.Fn regulator_enable "regulator_t reg"
.Ft int
.Fn regulator_disable "regulator_t reg"
.Ft int
.Fn regulator_stop "regulator_t reg"
.Ft int
.Fn regulator_status "regulator_t reg" "int *status"
.Ft int
.Fn regulator_get_voltage "regulator_t reg" "int *uvolt"
.Ft int
.Fn regulator_set_voltage "regulator_t reg" "int min_uvolt" "int max_uvolt"
.Ft int
.Fn regulator_check_voltage "regulator_t reg" "int uvolt"
.Ft int
.Fn regulator_get_by_ofw_property "device_t dev" "phandle_t node" "char *name" "regulator_t *reg"
.Sh DESCRIPTION
The regulator framework allow drivers to enable, disable and change regulator voltage.
.Sh RETURN VALUES
All functions returns 0 on success or
.Er ENODEV
if the regulator or one of its parent was not found.
.Sh INTERFACE
.Bl -tag -width indent
.It Fn regulator_get_by_name "device_t cdev" "const char *name" "regulator_t *regulator"
Resolve a regulator based on its name.
All regulators names are unique.
This will also increment the refcount on the regulator.
.It Fn regulator_get_by_id "device_t cdev" "device_t pdev" "intptr_t id" "regulator_t *regulator"
Resolve a regulator based on its id.
All regulators ids are unique.
This will also increment the refcount on the regulator.
.It Fn regulator_get_by_ofw_property "device_t dev" "phandle_t node" "char *name" "regulator_t *reg"
Resolve a regulator based on the fdt property named name.
If node is 0 then the function will get the ofw node itself.
This will also increment the refcount on the regulator.
Returns 0 on success or
.Er ENOENT
if the ofw property does not exists.
.It Fn regulator_release "regulator_t regulator"
This disables the regulator, decrements the refcount on it and frees the regulator variable passed.
.It Fn regulator_get_name "regulator_t regulator"
Returns the name of the regulator.
All regulator names are unique.
.It Fn regulator_enable "regulator_t reg"
Enable the regulator.
If the regulator supports a voltage range, the one configured in the hardware will be the output voltage.
If the regulator was already enabled by another driver this simply increments the enable counter.
.It Fn regulator_disable "regulator_t reg"
Disable the regulator.
If the regulator was also enabled by another driver this simply decrements the enable counter.
If the regulator was not previously enabled we will kassert.
.It Fn regulator_stop "regulator_t reg"
Disable the regulator in hardware.
This ensures the regulator is disabled even if it was enabled by bootloader.
This should not be called on regulator that has previously been enabled by a driver.
Returns 0 on success or
.Er EBUSY
if another consumer enabled it.
.It Fn regulator_status "regulator_t reg" "int *status"
Get the hardware status of the regulator.
status will contain a bit mask with
thoses possible value :
.Bl -tag -width indent
.It REGULATOR_STATUS_ENABLED
The regulator is enabled.
.It REGULATOR_STATUS_OVERCURRENT
The hardware reports that too much current is being drawn.
.El
.It Fn regulator_get_voltage "regulator_t reg" "int *uvolt"
Get the current voltage set for the regulator in microvolts.
.It Fn regulator_set_voltage "regulator_t reg" "int min_uvolt" "int max_uvolt"
Change the voltage for the regulator.
If a range is acceptable by the hardware or driver different values can be provided as min and max.
Returns 0 on success or
.Er ERANGE
if the regulator doesn't support this voltage range.
.It Fn regulator_check_voltage "regulator_t reg" "int uvolt"
Checks if the regulator support the given voltage.
Returns 0 on success or
.Er ERANGE
if the regulator doesn't support this voltage range.
.El
.Sh HISTORY
The
.Nm regulator
framework first appear in
.Fx 12.0 .
The
.Nm regulator
framework was written by
.An Michal Meloun Aq Mt mmel@FreeBSD.org .
The
.Nm regulator
manual page was written by
.An Emmanuel Vadot Aq Mt manu@FreeBSD.org .