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head/share/man/man9/pwm.9
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| svn:eol-style | null | native \ No newline at end of property |
| svn:keywords | null | FreeBSD=%H \ No newline at end of property |
| svn:mime-type | null | text/plain \ No newline at end of property |
| .\" Copyright (c) 2018 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. | |||||
| .\" | |||||
| .\" $FreeBSD$ | |||||
| .\" | |||||
| .Dd November 12, 2018 | |||||
| .Dt PWM 9 | |||||
| .Os | |||||
| .Sh NAME | |||||
| .Nm pwm , | |||||
| .Nm PWM_GET_BUS , | |||||
| .Nm PWM_CHANNEL_CONFIG , | |||||
| .Nm PWM_CHANNEL_GET_CONFIG , | |||||
| .Nm PWM_CHANNEL_SET_FLAGS , | |||||
| .Nm PWM_CHANNEL_GET_FLAGS , | |||||
| .Nm PWM_CHANNEL_ENABLE , | |||||
| .Nm PWM_CHANNEL_IS_ENABLED , | |||||
| .Nm PWM_CHANNEL_MAX | |||||
| .Nd PWM methods | |||||
| .Sh SYNOPSIS | |||||
| .Cd "device pwm" | |||||
| .In "pwm_if.h" | |||||
| .Ft device_t | |||||
| .Fn PWM_GET_BUS "device_t dev" | |||||
| .Ft int | |||||
| .Fn PWM_CHANNEL_CONFIG "device_t dev" "int channel" "uint64_t period" "uint64_t duty" | |||||
| .Ft int | |||||
| .Fn PWM_CHANNEL_GET_CONFIG "device_t dev" "int channel" "uint64_t *period" "uint64_t *duty" | |||||
| .Ft int | |||||
| .Fn PWM_CHANNEL_SET_FLAGS "device_t dev" "int channel" "uint32_t flags" | |||||
| .Ft int | |||||
| .Fn PWM_CHANNEL_GET_FLAGS "device_t dev" "int channel" "uint32_t *flags" | |||||
| .Ft int | |||||
| .Fn PWM_CHANNEL_ENABLE "device_t dev" "int channel" "bool enable" | |||||
| .Ft int | |||||
| .Fn PWM_CHANNEL_IS_ENABLED "device_t dev" "int channel" "bool *enabled" | |||||
| .Ft int | |||||
| .Fn PWM_CHANNEL_MAX "device_t dev" "int channel" "int *nchannel" | |||||
| .Sh DESCRIPTION | |||||
| The PWM (Pulse-Width Modulation) interface allows the device driver to register to a global | |||||
| bus so other devices in the kernel can use them in a generic way. | |||||
| .Sh INTERFACE | |||||
| .Bl -tag -width indent | |||||
| .It Fn PWM_GET_BUS "device_t dev" | |||||
| Return the bus device. | |||||
| .It Fn PWM_CHANNEL_CONFIG "device_t dev" "int channel" "uint64_t period" "uint64_t duty" | |||||
| Configure the period and duty (in nanoseconds) in the PWM controller for the specified channel. | |||||
| Returns 0 on success or | |||||
| .Er EINVAL | |||||
| if the values are not supported by the controller or | |||||
| .Er EBUSY | |||||
| is the PWM controller is in use and does not support changing the value on the fly. | |||||
| .It Fn PWM_CHANNEL_GET_CONFIG "device_t dev" "int channel" "uint64_t *period" "uint64_t *duty" | |||||
| Get the current configuration of the period and duty for the specified channel. | |||||
| .It Fn PWM_CHANNEL_SET_FLAGS "device_t dev" "int channel" "uint32_t flags" | |||||
| Set the flags of the channel (like inverted polarity). | |||||
| .It Fn PWM_CHANNEL_GET_FLAGS "device_t dev" "int channel" "uint32_t *flags" | |||||
| Get the current flags for the channel. | |||||
| .It Fn PWM_CHANNEL_ENABLE "device_t dev" "int channel" "bool enable" | |||||
| Enable the PWM channel. | |||||
| .It Fn PWM_CHANNEL_ISENABLED "device_t dev" "int channel" "bool *enable" | |||||
| Test if the PWM channel is enabled. | |||||
| .It PWM_CHANNEL_MAX "device_t dev" "int channel" "int *nchannel" | |||||
| Get the maximum number of channels supported by the controller. | |||||
| .El | |||||
| .Sh HISTORY | |||||
| The | |||||
| .Nm pwm | |||||
| interface first appeared in | |||||
| .Fx 13.0 . | |||||
| The | |||||
| .Nm pwm | |||||
| interface and manual page was written by | |||||
| .An Emmanuel Vadot Aq Mt manu@FreeBSD.org . | |||||