134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/* $NetBSD: fdt_regulator.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $ */
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/*-
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* Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: fdt_regulator.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kmem.h>
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#include <libfdt.h>
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#include <dev/fdt/fdtvar.h>
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struct fdtbus_regulator_controller {
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device_t rc_dev;
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int rc_phandle;
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const struct fdtbus_regulator_controller_func *rc_funcs;
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struct fdtbus_regulator_controller *rc_next;
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};
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static struct fdtbus_regulator_controller *fdtbus_rc = NULL;
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int
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fdtbus_register_regulator_controller(device_t dev, int phandle,
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const struct fdtbus_regulator_controller_func *funcs)
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{
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struct fdtbus_regulator_controller *rc;
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rc = kmem_alloc(sizeof(*rc), KM_SLEEP);
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rc->rc_dev = dev;
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rc->rc_phandle = phandle;
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rc->rc_funcs = funcs;
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rc->rc_next = fdtbus_rc;
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fdtbus_rc = rc;
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return 0;
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}
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static struct fdtbus_regulator_controller *
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fdtbus_get_regulator_controller(int phandle)
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{
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struct fdtbus_regulator_controller *rc;
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for (rc = fdtbus_rc; rc; rc = rc->rc_next) {
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if (rc->rc_phandle == phandle) {
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return rc;
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}
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}
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return NULL;
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}
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struct fdtbus_regulator *
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fdtbus_regulator_acquire(int phandle, const char *prop)
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{
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struct fdtbus_regulator_controller *rc;
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struct fdtbus_regulator *reg;
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int regulator_phandle;
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int error;
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regulator_phandle = fdtbus_get_phandle(phandle, prop);
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if (regulator_phandle == -1) {
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return NULL;
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}
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rc = fdtbus_get_regulator_controller(regulator_phandle);
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if (rc == NULL) {
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return NULL;
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}
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error = rc->rc_funcs->acquire(rc->rc_dev);
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if (error) {
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return NULL;
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}
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reg = kmem_alloc(sizeof(*reg), KM_SLEEP);
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reg->reg_rc = rc;
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return reg;
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}
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void
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fdtbus_regulator_release(struct fdtbus_regulator *reg)
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{
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struct fdtbus_regulator_controller *rc = reg->reg_rc;
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rc->rc_funcs->release(rc->rc_dev);
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kmem_free(reg, sizeof(*reg));
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}
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int
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fdtbus_regulator_enable(struct fdtbus_regulator *reg)
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{
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struct fdtbus_regulator_controller *rc = reg->reg_rc;
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return rc->rc_funcs->enable(rc->rc_dev, true);
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}
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int
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fdtbus_regulator_disable(struct fdtbus_regulator *reg)
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{
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struct fdtbus_regulator_controller *rc = reg->reg_rc;
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return rc->rc_funcs->enable(rc->rc_dev, false);
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}
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