9312900f6d
The pwm subsystem consist of API for PWM controllers, pwmbus to register them and a pwm(8) utility to talk to them from userland. Reviewed by: oshgobo (capsicum), bcr (manpage), 0mp (manpage) Differential Revision: https://reviews.freebsd.org/D17938
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2018 Emmanuel Vadot <manu@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/resource.h>
|
|
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
|
|
#include <dev/pwm/pwmbus.h>
|
|
|
|
#include "pwm_if.h"
|
|
|
|
int
|
|
pwm_get_by_ofw_propidx(device_t consumer, phandle_t node,
|
|
const char *prop_name, int idx, pwm_channel_t *out_channel)
|
|
{
|
|
phandle_t xref;
|
|
pcell_t *cells;
|
|
struct pwm_channel channel;
|
|
int ncells, rv;
|
|
|
|
rv = ofw_bus_parse_xref_list_alloc(node, prop_name, "#pwm-cells",
|
|
idx, &xref, &ncells, &cells);
|
|
if (rv != 0)
|
|
return (rv);
|
|
|
|
channel.dev = OF_device_from_xref(xref);
|
|
if (channel.dev == NULL) {
|
|
OF_prop_free(cells);
|
|
return (ENODEV);
|
|
}
|
|
|
|
channel.busdev = PWM_GET_BUS(channel.dev);
|
|
if (channel.busdev == NULL) {
|
|
OF_prop_free(cells);
|
|
return (ENODEV);
|
|
}
|
|
|
|
channel.channel = cells[0];
|
|
channel.period = cells[1];
|
|
|
|
if (ncells >= 3)
|
|
channel.flags = cells[2];
|
|
|
|
*out_channel = malloc(sizeof(struct pwm_channel), M_DEVBUF, M_WAITOK | M_ZERO);
|
|
**out_channel = channel;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
pwm_get_by_ofw_idx(device_t consumer, phandle_t node, int idx,
|
|
pwm_channel_t *out_channel)
|
|
{
|
|
|
|
return (pwm_get_by_ofw_propidx(consumer, node, "pwms", idx, out_channel));
|
|
}
|
|
|
|
int
|
|
pwm_get_by_ofw_property(device_t consumer, phandle_t node,
|
|
const char *prop_name, pwm_channel_t *out_channel)
|
|
{
|
|
|
|
return (pwm_get_by_ofw_propidx(consumer, node, prop_name, 0, out_channel));
|
|
}
|
|
|
|
int
|
|
pwm_get_by_ofw_name(device_t consumer, phandle_t node, const char *name,
|
|
pwm_channel_t *out_channel)
|
|
{
|
|
int rv, idx;
|
|
|
|
rv = ofw_bus_find_string_index(node, "pwm-names", name, &idx);
|
|
if (rv != 0)
|
|
return (rv);
|
|
|
|
return (pwm_get_by_ofw_idx(consumer, node, idx, out_channel));
|
|
}
|