FreeBSD/Linux Kernel Cross Reference
sys/dev/pwm/ofw_pwm.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * 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 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/ofw_pwm.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.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));
   }

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