1 /* $OpenBSD: gpiobl.c,v 1.3 2023/01/03 10:59:00 tobhe Exp $ */ 2 /* 3 * Copyright (c) 2022 Tobias Heider <tobhe@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/param.h> 19 #include <sys/systm.h> 20 #include <sys/device.h> 21 #include <sys/malloc.h> 22 #include <sys/task.h> 23 24 #include <machine/fdt.h> 25 #include <machine/bus.h> 26 27 #include <dev/ofw/openfirm.h> 28 #include <dev/ofw/ofw_gpio.h> 29 #include <dev/ofw/ofw_misc.h> 30 31 #include <dev/wscons/wsconsio.h> 32 #include <dev/wscons/wsdisplayvar.h> 33 34 extern void (*simplefb_burn_hook)(u_int); 35 36 struct gpiobl_softc { 37 struct device sc_dev; 38 int sc_on; 39 uint32_t sc_gpio[3]; 40 struct task sc_task; 41 }; 42 43 struct gpiobl_softc *sc_gpiobl; 44 45 int gpiobl_match(struct device *, void *, void *); 46 void gpiobl_attach(struct device *, struct device *, void *); 47 int gpiobl_activate(struct device *, int); 48 49 const struct cfattach gpiobl_ca = { 50 sizeof(struct gpiobl_softc), gpiobl_match, gpiobl_attach, NULL, 51 gpiobl_activate 52 }; 53 54 struct cfdriver gpiobl_cd = { 55 NULL, "gpiobl", DV_DULL 56 }; 57 58 void gpiobl_set(u_int); 59 void gpiobl_task(void *); 60 61 int 62 gpiobl_match(struct device *parent, void *match, void *aux) 63 { 64 struct fdt_attach_args *faa = aux; 65 66 return OF_is_compatible(faa->fa_node, "gpio-backlight"); 67 } 68 69 70 void 71 gpiobl_attach(struct device *parent, struct device *self, void *aux) 72 { 73 struct gpiobl_softc *sc = (struct gpiobl_softc *)self; 74 struct fdt_attach_args *faa = aux; 75 size_t len; 76 77 len = OF_getproplen(faa->fa_node, "gpios"); 78 if (len <= 0) 79 return; 80 OF_getpropintarray(faa->fa_node, "gpios", sc->sc_gpio, len); 81 gpio_controller_config_pin(sc->sc_gpio, GPIO_CONFIG_OUTPUT); 82 83 sc->sc_on = OF_getpropbool(faa->fa_node, "default-on"); 84 sc_gpiobl = sc; 85 86 task_set(&sc->sc_task, gpiobl_task, sc); 87 88 simplefb_burn_hook = gpiobl_set; 89 90 printf("\n"); 91 } 92 93 int 94 gpiobl_activate(struct device *self, int act) 95 { 96 struct gpiobl_softc *sc = (struct gpiobl_softc *)self; 97 98 switch (act) { 99 case DVACT_QUIESCE: 100 gpio_controller_set_pin(&sc->sc_gpio[0], 0); 101 break; 102 case DVACT_WAKEUP: 103 gpio_controller_set_pin(&sc->sc_gpio[0], sc->sc_on); 104 break; 105 } 106 107 return 0; 108 } 109 110 void 111 gpiobl_set(u_int on) 112 { 113 struct gpiobl_softc *sc = (struct gpiobl_softc *)sc_gpiobl; 114 sc->sc_on = on; 115 task_add(systq, &sc->sc_task); 116 } 117 118 void 119 gpiobl_task(void *args) 120 { 121 struct gpiobl_softc *sc = args; 122 gpio_controller_set_pin(&sc->sc_gpio[0], sc->sc_on); 123 } 124