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fdt_regulator.c revision 1.3 
      1 /* $NetBSD: fdt_regulator.c,v 1.3 2017/04/22 21:47:41 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: fdt_regulator.c,v 1.3 2017/04/22 21:47:41 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/kmem.h>
     35 
     36 #include <libfdt.h>
     37 #include <dev/fdt/fdtvar.h>
     38 
     39 struct fdtbus_regulator_controller {
     40 	device_t rc_dev;
     41 	int rc_phandle;
     42 	const struct fdtbus_regulator_controller_func *rc_funcs;
     43 
     44 	struct fdtbus_regulator_controller *rc_next;
     45 };
     46 
     47 static struct fdtbus_regulator_controller *fdtbus_rc = NULL;
     48 
     49 int
     50 fdtbus_register_regulator_controller(device_t dev, int phandle,
     51     const struct fdtbus_regulator_controller_func *funcs)
     52 {
     53 	struct fdtbus_regulator_controller *rc;
     54 
     55 	rc = kmem_alloc(sizeof(*rc), KM_SLEEP);
     56 	rc->rc_dev = dev;
     57 	rc->rc_phandle = phandle;
     58 	rc->rc_funcs = funcs;
     59 
     60 	rc->rc_next = fdtbus_rc;
     61 	fdtbus_rc = rc;
     62 
     63 	return 0;
     64 }
     65 
     66 static struct fdtbus_regulator_controller *
     67 fdtbus_get_regulator_controller(int phandle)
     68 {
     69 	struct fdtbus_regulator_controller *rc;
     70 
     71 	for (rc = fdtbus_rc; rc; rc = rc->rc_next) {
     72 		if (rc->rc_phandle == phandle) {
     73 			return rc;
     74 		}
     75 	}
     76 
     77 	return NULL;
     78 }
     79 
     80 struct fdtbus_regulator *
     81 fdtbus_regulator_acquire(int phandle, const char *prop)
     82 {
     83 	struct fdtbus_regulator_controller *rc;
     84 	struct fdtbus_regulator *reg;
     85 	int regulator_phandle;
     86 	int error;
     87 
     88 	regulator_phandle = fdtbus_get_phandle(phandle, prop);
     89 	if (regulator_phandle == -1) {
     90 		return NULL;
     91 	}
     92 
     93 	rc = fdtbus_get_regulator_controller(regulator_phandle);
     94 	if (rc == NULL) {
     95 		return NULL;
     96 	}
     97 
     98 	error = rc->rc_funcs->acquire(rc->rc_dev);
     99 	if (error) {
    100 		return NULL;
    101 	}
    102 
    103 	reg = kmem_alloc(sizeof(*reg), KM_SLEEP);
    104 	reg->reg_rc = rc;
    105 
    106 	return reg;
    107 }
    108 
    109 void
    110 fdtbus_regulator_release(struct fdtbus_regulator *reg)
    111 {
    112 	struct fdtbus_regulator_controller *rc = reg->reg_rc;
    113 
    114 	rc->rc_funcs->release(rc->rc_dev);
    115 
    116 	kmem_free(reg, sizeof(*reg));
    117 }
    118 
    119 int
    120 fdtbus_regulator_enable(struct fdtbus_regulator *reg)
    121 {
    122 	struct fdtbus_regulator_controller *rc = reg->reg_rc;
    123 
    124 	return rc->rc_funcs->enable(rc->rc_dev, true);
    125 }
    126 
    127 int
    128 fdtbus_regulator_disable(struct fdtbus_regulator *reg)
    129 {
    130 	struct fdtbus_regulator_controller *rc = reg->reg_rc;
    131 
    132 	return rc->rc_funcs->enable(rc->rc_dev, false);
    133 }
    134 
    135 int
    136 fdtbus_regulator_set_voltage(struct fdtbus_regulator *reg, u_int min_uvol,
    137     u_int max_uvol)
    138 {
    139 	struct fdtbus_regulator_controller *rc = reg->reg_rc;
    140 
    141 	if (rc->rc_funcs->set_voltage == NULL)
    142 		return EINVAL;
    143 
    144 	return rc->rc_funcs->set_voltage(rc->rc_dev, min_uvol, max_uvol);
    145 }
    146 
    147 int
    148 fdtbus_regulator_get_voltage(struct fdtbus_regulator *reg, u_int *puvol)
    149 {
    150 	struct fdtbus_regulator_controller *rc = reg->reg_rc;
    151 
    152 	if (rc->rc_funcs->set_voltage == NULL)
    153 		return EINVAL;
    154 
    155 	return rc->rc_funcs->get_voltage(rc->rc_dev, puvol);
    156 }
    157