1 /* $NetBSD: fixedregulator.c,v 1.3 2015/12/22 22:19:07 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: fixedregulator.c,v 1.3 2015/12/22 22:19:07 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/device.h> 35 #include <sys/kmem.h> 36 #include <sys/bus.h> 37 #include <sys/gpio.h> 38 39 #include <dev/fdt/fdtvar.h> 40 41 static int fixedregulator_match(device_t, cfdata_t, void *); 42 static void fixedregulator_attach(device_t, device_t, void *); 43 44 static int fixedregulator_acquire(device_t); 45 static void fixedregulator_release(device_t); 46 static int fixedregulator_enable(device_t, bool); 47 48 struct fdtbus_regulator_controller_func fixedregulator_funcs = { 49 .acquire = fixedregulator_acquire, 50 .release = fixedregulator_release, 51 .enable = fixedregulator_enable 52 }; 53 54 struct fixedregulator_softc { 55 device_t sc_dev; 56 int sc_phandle; 57 58 struct fdtbus_gpio_pin *sc_pin; 59 bool sc_always_on; 60 bool sc_enable_val; 61 }; 62 63 CFATTACH_DECL_NEW(fregulator, sizeof(struct fixedregulator_softc), 64 fixedregulator_match, fixedregulator_attach, NULL, NULL); 65 66 static int 67 fixedregulator_match(device_t parent, cfdata_t cf, void *aux) 68 { 69 const char * const compatible[] = { "regulator-fixed", NULL }; 70 const struct fdt_attach_args *faa = aux; 71 72 return of_match_compatible(faa->faa_phandle, compatible); 73 } 74 75 static void 76 fixedregulator_attach(device_t parent, device_t self, void *aux) 77 { 78 struct fixedregulator_softc * const sc = device_private(self); 79 const struct fdt_attach_args *faa = aux; 80 const int phandle = faa->faa_phandle; 81 char *name; 82 int len, gpioflags; 83 84 sc->sc_dev = self; 85 sc->sc_phandle = phandle; 86 87 aprint_naive("\n"); 88 89 len = OF_getproplen(phandle, "regulator-name"); 90 if (len > 0) { 91 name = kmem_zalloc(len, KM_SLEEP); 92 if (OF_getprop(phandle, "regulator-name", name, len) == len) { 93 aprint_normal(": %s\n", name); 94 } else { 95 aprint_normal("\n"); 96 } 97 kmem_free(name, len); 98 } else { 99 aprint_normal("\n"); 100 } 101 102 gpioflags = GPIO_PIN_OUTPUT; 103 if (of_getprop_bool(phandle, "gpio-open-drain")) 104 gpioflags |= GPIO_PIN_OPENDRAIN; 105 106 sc->sc_always_on = of_getprop_bool(phandle, "regulator-always-on"); 107 sc->sc_pin = fdtbus_gpio_acquire(phandle, "gpio", gpioflags); 108 if (sc->sc_pin == NULL) 109 sc->sc_always_on = true; 110 sc->sc_enable_val = of_getprop_bool(phandle, "enable-active-high"); 111 112 fdtbus_register_regulator_controller(self, phandle, 113 &fixedregulator_funcs); 114 } 115 116 static int 117 fixedregulator_acquire(device_t dev) 118 { 119 return 0; 120 } 121 122 static void 123 fixedregulator_release(device_t dev) 124 { 125 } 126 127 static int 128 fixedregulator_enable(device_t dev, bool enable) 129 { 130 struct fixedregulator_softc * const sc = device_private(dev); 131 132 if (enable) { 133 if (sc->sc_always_on) { 134 return 0; 135 } else { 136 fdtbus_gpio_write_raw(sc->sc_pin, sc->sc_enable_val); 137 return 0; 138 } 139 } else { 140 if (sc->sc_always_on) { 141 return EIO; 142 } else { 143 fdtbus_gpio_write_raw(sc->sc_pin, !sc->sc_enable_val); 144 return 0; 145 } 146 } 147 } 148