1 /* $NetBSD: fixedregulator.c,v 1.5 2017/04/24 10:55:26 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 1.5 2017/04/24 10:55:26 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_boot_on; 61 bool sc_enable_val; 62 uint32_t sc_delay; 63 64 int sc_gpioflags; 65 bool sc_deferred; 66 }; 67 68 CFATTACH_DECL_NEW(fregulator, sizeof(struct fixedregulator_softc), 69 fixedregulator_match, fixedregulator_attach, NULL, NULL); 70 71 static int 72 fixedregulator_match(device_t parent, cfdata_t cf, void *aux) 73 { 74 const char * const compatible[] = { "regulator-fixed", NULL }; 75 const struct fdt_attach_args *faa = aux; 76 77 return of_match_compatible(faa->faa_phandle, compatible); 78 } 79 80 static void 81 fixedregulator_attach(device_t parent, device_t self, void *aux) 82 { 83 struct fixedregulator_softc * const sc = device_private(self); 84 const struct fdt_attach_args *faa = aux; 85 const int phandle = faa->faa_phandle; 86 char *name; 87 int len; 88 89 sc->sc_dev = self; 90 sc->sc_phandle = phandle; 91 92 aprint_naive("\n"); 93 94 len = OF_getproplen(phandle, "regulator-name"); 95 if (len > 0) { 96 name = kmem_zalloc(len, KM_SLEEP); 97 if (OF_getprop(phandle, "regulator-name", name, len) == len) { 98 aprint_normal(": %s\n", name); 99 } else { 100 aprint_normal("\n"); 101 } 102 kmem_free(name, len); 103 } else { 104 aprint_normal("\n"); 105 } 106 107 sc->sc_gpioflags = GPIO_PIN_OUTPUT; 108 if (of_getprop_bool(phandle, "gpio-open-drain")) 109 sc->sc_gpioflags |= GPIO_PIN_OPENDRAIN; 110 111 sc->sc_always_on = of_getprop_bool(phandle, "regulator-always-on"); 112 sc->sc_boot_on = of_getprop_bool(phandle, "regulator-boot-on"); 113 sc->sc_enable_val = of_getprop_bool(phandle, "enable-active-high"); 114 if (of_getprop_uint32(phandle, "startup-delay-us", &sc->sc_delay) != 0) 115 sc->sc_delay = 0; 116 117 sc->sc_pin = fdtbus_gpio_acquire(phandle, "gpio", sc->sc_gpioflags); 118 if (sc->sc_pin == NULL) 119 sc->sc_always_on = OF_getproplen(phandle, "gpio") <= 0; 120 121 fdtbus_register_regulator_controller(self, phandle, 122 &fixedregulator_funcs); 123 124 /* 125 * If the regulator is flagged as always on or enabled at boot, 126 * ensure that it is enabled 127 */ 128 if (sc->sc_always_on || sc->sc_boot_on) 129 fixedregulator_enable(self, true); 130 } 131 132 static int 133 fixedregulator_acquire(device_t dev) 134 { 135 struct fixedregulator_softc * const sc = device_private(dev); 136 137 if (sc->sc_pin == NULL && !sc->sc_always_on) { 138 sc->sc_pin = fdtbus_gpio_acquire(sc->sc_phandle, "gpio", 139 sc->sc_gpioflags); 140 if (sc->sc_pin == NULL) 141 return ENXIO; 142 } 143 144 return 0; 145 } 146 147 static void 148 fixedregulator_release(device_t dev) 149 { 150 } 151 152 static int 153 fixedregulator_enable(device_t dev, bool enable) 154 { 155 struct fixedregulator_softc * const sc = device_private(dev); 156 157 if (enable) { 158 if (sc->sc_pin != NULL) 159 fdtbus_gpio_write_raw(sc->sc_pin, sc->sc_enable_val); 160 if (sc->sc_delay > 0) 161 delay(sc->sc_delay); 162 } else { 163 if (sc->sc_always_on) 164 return EIO; 165 fdtbus_gpio_write_raw(sc->sc_pin, !sc->sc_enable_val); 166 } 167 return 0; 168 } 169