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fdt_regulator.c revision 1.6 
      1 /* $NetBSD: fdt_regulator.c,v 1.6 2018/06/30 20:34:43 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 1.6 2018/06/30 20:34:43 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/kmem.h>
     35 #include <sys/queue.h>
     36 
     37 #include <libfdt.h>
     38 #include <dev/fdt/fdtvar.h>
     39 
     40 struct fdtbus_regulator_controller {
     41 	device_t rc_dev;
     42 	int rc_phandle;
     43 	const struct fdtbus_regulator_controller_func *rc_funcs;
     44 
     45 	LIST_ENTRY(fdtbus_regulator_controller) rc_next;
     46 };
     47 
     48 static LIST_HEAD(, fdtbus_regulator_controller) fdtbus_regulator_controllers =
     49     LIST_HEAD_INITIALIZER(fdtbus_regulator_controllers);
     50 
     51 int
     52 fdtbus_register_regulator_controller(device_t dev, int phandle,
     53     const struct fdtbus_regulator_controller_func *funcs)
     54 {
     55 	struct fdtbus_regulator_controller *rc;
     56 
     57 	rc = kmem_alloc(sizeof(*rc), KM_SLEEP);
     58 	rc->rc_dev = dev;
     59 	rc->rc_phandle = phandle;
     60 	rc->rc_funcs = funcs;
     61 
     62 	LIST_INSERT_HEAD(&fdtbus_regulator_controllers, rc, rc_next);
     63 
     64 	return 0;
     65 }
     66 
     67 static struct fdtbus_regulator_controller *
     68 fdtbus_get_regulator_controller(int phandle)
     69 {
     70 	struct fdtbus_regulator_controller *rc;
     71 
     72 	LIST_FOREACH(rc, &fdtbus_regulator_controllers, rc_next) {
     73 		if (rc->rc_phandle == phandle)
     74 			return rc;
     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 		aprint_error_dev(rc->rc_dev, "failed to acquire regulator: %d\n", error);
    101 		return NULL;
    102 	}
    103 
    104 	reg = kmem_alloc(sizeof(*reg), KM_SLEEP);
    105 	reg->reg_rc = rc;
    106 
    107 	return reg;
    108 }
    109 
    110 void
    111 fdtbus_regulator_release(struct fdtbus_regulator *reg)
    112 {
    113 	struct fdtbus_regulator_controller *rc = reg->reg_rc;
    114 
    115 	rc->rc_funcs->release(rc->rc_dev);
    116 
    117 	kmem_free(reg, sizeof(*reg));
    118 }
    119 
    120 int
    121 fdtbus_regulator_enable(struct fdtbus_regulator *reg)
    122 {
    123 	struct fdtbus_regulator_controller *rc = reg->reg_rc;
    124 
    125 	return rc->rc_funcs->enable(rc->rc_dev, true);
    126 }
    127 
    128 int
    129 fdtbus_regulator_disable(struct fdtbus_regulator *reg)
    130 {
    131 	struct fdtbus_regulator_controller *rc = reg->reg_rc;
    132 
    133 	return rc->rc_funcs->enable(rc->rc_dev, false);
    134 }
    135 
    136 int
    137 fdtbus_regulator_set_voltage(struct fdtbus_regulator *reg, u_int min_uvol,
    138     u_int max_uvol)
    139 {
    140 	struct fdtbus_regulator_controller *rc = reg->reg_rc;
    141 
    142 	if (rc->rc_funcs->set_voltage == NULL)
    143 		return EINVAL;
    144 
    145 	return rc->rc_funcs->set_voltage(rc->rc_dev, min_uvol, max_uvol);
    146 }
    147 
    148 int
    149 fdtbus_regulator_get_voltage(struct fdtbus_regulator *reg, u_int *puvol)
    150 {
    151 	struct fdtbus_regulator_controller *rc = reg->reg_rc;
    152 
    153 	if (rc->rc_funcs->get_voltage == NULL)
    154 		return EINVAL;
    155 
    156 	return rc->rc_funcs->get_voltage(rc->rc_dev, puvol);
    157 }
    158