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@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