1 /* $NetBSD: fixedregulator.c,v 1.4 2016/06/15 13:13:40 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 1.4 2016/06/15 13:13:40 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 65 CFATTACH_DECL_NEW(fregulator, sizeof(struct fixedregulator_softc), 66 fixedregulator_match, fixedregulator_attach, NULL, NULL); 67 68 static int 69 fixedregulator_match(device_t parent, cfdata_t cf, void *aux) 70 { 71 const char * const compatible[] = { "regulator-fixed", NULL }; 72 const struct fdt_attach_args *faa = aux; 73 74 return of_match_compatible(faa->faa_phandle, compatible); 75 } 76 77 static void 78 fixedregulator_attach(device_t parent, device_t self, void *aux) 79 { 80 struct fixedregulator_softc * const sc = device_private(self); 81 const struct fdt_attach_args *faa = aux; 82 const int phandle = faa->faa_phandle; 83 char *name; 84 int len, gpioflags; 85 86 sc->sc_dev = self; 87 sc->sc_phandle = phandle; 88 89 aprint_naive("\n"); 90 91 len = OF_getproplen(phandle, "regulator-name"); 92 if (len > 0) { 93 name = kmem_zalloc(len, KM_SLEEP); 94 if (OF_getprop(phandle, "regulator-name", name, len) == len) { 95 aprint_normal(": %s\n", name); 96 } else { 97 aprint_normal("\n"); 98 } 99 kmem_free(name, len); 100 } else { 101 aprint_normal("\n"); 102 } 103 104 gpioflags = GPIO_PIN_OUTPUT; 105 if (of_getprop_bool(phandle, "gpio-open-drain")) 106 gpioflags |= GPIO_PIN_OPENDRAIN; 107 108 sc->sc_always_on = of_getprop_bool(phandle, "regulator-always-on"); 109 sc->sc_boot_on = of_getprop_bool(phandle, "regulator-boot-on"); 110 sc->sc_enable_val = of_getprop_bool(phandle, "enable-active-high"); 111 if (of_getprop_uint32(phandle, "startup-delay-us", &sc->sc_delay) != 0) 112 sc->sc_delay = 0; 113 114 sc->sc_pin = fdtbus_gpio_acquire(phandle, "gpio", gpioflags); 115 if (sc->sc_pin == NULL) 116 sc->sc_always_on = true; 117 118 fdtbus_register_regulator_controller(self, phandle, 119 &fixedregulator_funcs); 120 121 /* 122 * If the regulator is flagged as always on or enabled at boot, 123 * ensure that it is enabled 124 */ 125 if (sc->sc_always_on || sc->sc_boot_on) 126 fixedregulator_enable(self, true); 127 } 128 129 static int 130 fixedregulator_acquire(device_t dev) 131 { 132 return 0; 133 } 134 135 static void 136 fixedregulator_release(device_t dev) 137 { 138 } 139 140 static int 141 fixedregulator_enable(device_t dev, bool enable) 142 { 143 struct fixedregulator_softc * const sc = device_private(dev); 144 145 if (enable) { 146 if (sc->sc_pin != NULL) 147 fdtbus_gpio_write_raw(sc->sc_pin, sc->sc_enable_val); 148 if (sc->sc_delay > 0) 149 delay(sc->sc_delay); 150 } else { 151 if (sc->sc_always_on) 152 return EIO; 153 fdtbus_gpio_write_raw(sc->sc_pin, !sc->sc_enable_val); 154 } 155 return 0; 156 } 157