1 /* $NetBSD: fdt_regulator.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2015 Jared D. McNeill <jmcneill@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 1.2 2015/12/16 12:17:45 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