gpiobutton.c revision 1.2.2.2
1 1.2.2.2 skrll /* $NetBSD: gpiobutton.c,v 1.2.2.2 2015/06/06 14:40:07 skrll Exp $ */ 2 1.2.2.2 skrll 3 1.2.2.2 skrll /*- 4 1.2.2.2 skrll * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca> 5 1.2.2.2 skrll * All rights reserved. 6 1.2.2.2 skrll * 7 1.2.2.2 skrll * Redistribution and use in source and binary forms, with or without 8 1.2.2.2 skrll * modification, are permitted provided that the following conditions 9 1.2.2.2 skrll * are met: 10 1.2.2.2 skrll * 1. Redistributions of source code must retain the above copyright 11 1.2.2.2 skrll * notice, this list of conditions and the following disclaimer. 12 1.2.2.2 skrll * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.2.2 skrll * notice, this list of conditions and the following disclaimer in the 14 1.2.2.2 skrll * documentation and/or other materials provided with the distribution. 15 1.2.2.2 skrll * 16 1.2.2.2 skrll * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.2.2.2 skrll * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.2.2.2 skrll * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.2.2.2 skrll * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.2.2.2 skrll * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.2.2.2 skrll * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.2.2.2 skrll * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.2.2.2 skrll * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.2.2.2 skrll * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.2.2.2 skrll * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.2.2.2 skrll * SUCH DAMAGE. 27 1.2.2.2 skrll */ 28 1.2.2.2 skrll 29 1.2.2.2 skrll #include "locators.h" 30 1.2.2.2 skrll 31 1.2.2.2 skrll #include <sys/cdefs.h> 32 1.2.2.2 skrll __KERNEL_RCSID(0, "$NetBSD: gpiobutton.c,v 1.2.2.2 2015/06/06 14:40:07 skrll Exp $"); 33 1.2.2.2 skrll 34 1.2.2.2 skrll #include <sys/param.h> 35 1.2.2.2 skrll #include <sys/bus.h> 36 1.2.2.2 skrll #include <sys/device.h> 37 1.2.2.2 skrll #include <sys/intr.h> 38 1.2.2.2 skrll #include <sys/systm.h> 39 1.2.2.2 skrll #include <sys/kernel.h> 40 1.2.2.2 skrll #include <sys/workqueue.h> 41 1.2.2.2 skrll #include <sys/gpio.h> 42 1.2.2.2 skrll 43 1.2.2.2 skrll #include <dev/sysmon/sysmonvar.h> 44 1.2.2.2 skrll 45 1.2.2.2 skrll #include <dev/gpio/gpiovar.h> 46 1.2.2.2 skrll 47 1.2.2.2 skrll #define GPIOBUTTON_POLL_INTERVAL mstohz(200) 48 1.2.2.2 skrll 49 1.2.2.2 skrll #define GPIOBUTTON_POLARITY_MASK 0x80 50 1.2.2.2 skrll #define GPIOBUTTON_POLARITY_ACTIVE_LOW 0 51 1.2.2.2 skrll #define GPIOBUTTON_POLARITY_ACTIVE_HIGH 1 52 1.2.2.2 skrll #define GPIOBUTTON_TYPE_MASK 0x0f 53 1.2.2.2 skrll #define GPIOBUTTON_TYPE_POWER 1 54 1.2.2.2 skrll #define GPIOBUTTON_TYPE_SLEEP 2 55 1.2.2.2 skrll 56 1.2.2.2 skrll static int gpiobutton_match(device_t, cfdata_t, void *); 57 1.2.2.2 skrll static void gpiobutton_attach(device_t, device_t, void *); 58 1.2.2.2 skrll 59 1.2.2.2 skrll struct gpiobutton_softc { 60 1.2.2.2 skrll device_t sc_dev; 61 1.2.2.2 skrll void *sc_gpio; 62 1.2.2.2 skrll struct gpio_pinmap sc_map; 63 1.2.2.2 skrll int sc_pinmap[1]; 64 1.2.2.2 skrll bool sc_active_high; 65 1.2.2.2 skrll 66 1.2.2.2 skrll struct sysmon_pswitch sc_smpsw; 67 1.2.2.2 skrll 68 1.2.2.2 skrll struct workqueue *sc_wq; 69 1.2.2.2 skrll callout_t sc_tick; 70 1.2.2.2 skrll bool sc_state; 71 1.2.2.2 skrll struct work sc_work; 72 1.2.2.2 skrll }; 73 1.2.2.2 skrll 74 1.2.2.2 skrll static bool gpiobutton_is_pressed(struct gpiobutton_softc *); 75 1.2.2.2 skrll static void gpiobutton_tick(void *); 76 1.2.2.2 skrll static void gpiobutton_task(struct work *, void *); 77 1.2.2.2 skrll 78 1.2.2.2 skrll CFATTACH_DECL_NEW(gpiobutton, sizeof(struct gpiobutton_softc), 79 1.2.2.2 skrll gpiobutton_match, gpiobutton_attach, NULL, NULL); 80 1.2.2.2 skrll 81 1.2.2.2 skrll static int 82 1.2.2.2 skrll gpiobutton_match(device_t parent, cfdata_t cf, void *aux) 83 1.2.2.2 skrll { 84 1.2.2.2 skrll struct gpio_attach_args * const ga = aux; 85 1.2.2.2 skrll 86 1.2.2.2 skrll if (strcmp(ga->ga_dvname, cf->cf_name) != 0) 87 1.2.2.2 skrll return 0; 88 1.2.2.2 skrll 89 1.2.2.2 skrll if (ga->ga_offset == -1 || gpio_npins(ga->ga_mask) != 1) 90 1.2.2.2 skrll return 0; 91 1.2.2.2 skrll 92 1.2.2.2 skrll const u_int type = __SHIFTOUT(ga->ga_flags, GPIOBUTTON_TYPE_MASK); 93 1.2.2.2 skrll 94 1.2.2.2 skrll switch (type) { 95 1.2.2.2 skrll case GPIOBUTTON_TYPE_POWER: 96 1.2.2.2 skrll case GPIOBUTTON_TYPE_SLEEP: 97 1.2.2.2 skrll return 1; 98 1.2.2.2 skrll default: 99 1.2.2.2 skrll return 0; 100 1.2.2.2 skrll } 101 1.2.2.2 skrll } 102 1.2.2.2 skrll 103 1.2.2.2 skrll static void 104 1.2.2.2 skrll gpiobutton_attach(device_t parent, device_t self, void *aux) 105 1.2.2.2 skrll { 106 1.2.2.2 skrll struct gpiobutton_softc * const sc = device_private(self); 107 1.2.2.2 skrll struct gpio_attach_args * const ga = aux; 108 1.2.2.2 skrll const char *desc; 109 1.2.2.2 skrll int caps, error; 110 1.2.2.2 skrll 111 1.2.2.2 skrll const u_int type = __SHIFTOUT(ga->ga_flags, GPIOBUTTON_TYPE_MASK); 112 1.2.2.2 skrll const u_int pol = __SHIFTOUT(ga->ga_flags, GPIOBUTTON_POLARITY_MASK); 113 1.2.2.2 skrll 114 1.2.2.2 skrll sc->sc_dev = self; 115 1.2.2.2 skrll sc->sc_gpio = ga->ga_gpio; 116 1.2.2.2 skrll sc->sc_map.pm_map = sc->sc_pinmap; 117 1.2.2.2 skrll if (gpio_pin_map(sc->sc_gpio, ga->ga_offset, ga->ga_mask, 118 1.2.2.2 skrll &sc->sc_map)) { 119 1.2.2.2 skrll aprint_error(": couldn't map pins\n"); 120 1.2.2.2 skrll return; 121 1.2.2.2 skrll } 122 1.2.2.2 skrll sc->sc_active_high = pol == GPIOBUTTON_POLARITY_ACTIVE_HIGH; 123 1.2.2.2 skrll 124 1.2.2.2 skrll caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, 0); 125 1.2.2.2 skrll if ((caps & GPIO_PIN_INPUT) == 0) { 126 1.2.2.2 skrll aprint_error(": pin is not an input pin\n"); 127 1.2.2.2 skrll return; 128 1.2.2.2 skrll } 129 1.2.2.2 skrll 130 1.2.2.2 skrll gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, 0, GPIO_PIN_INPUT); 131 1.2.2.2 skrll 132 1.2.2.2 skrll sc->sc_smpsw.smpsw_name = device_xname(self); 133 1.2.2.2 skrll switch (type) { 134 1.2.2.2 skrll case GPIOBUTTON_TYPE_POWER: 135 1.2.2.2 skrll sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_POWER; 136 1.2.2.2 skrll desc = "Power"; 137 1.2.2.2 skrll break; 138 1.2.2.2 skrll case GPIOBUTTON_TYPE_SLEEP: 139 1.2.2.2 skrll sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_SLEEP; 140 1.2.2.2 skrll desc = "Sleep"; 141 1.2.2.2 skrll break; 142 1.2.2.2 skrll default: 143 1.2.2.2 skrll panic("%s: impossible", __func__); 144 1.2.2.2 skrll } 145 1.2.2.2 skrll 146 1.2.2.2 skrll aprint_naive("\n"); 147 1.2.2.2 skrll aprint_normal(": %s button\n", desc); 148 1.2.2.2 skrll 149 1.2.2.2 skrll sysmon_pswitch_register(&sc->sc_smpsw); 150 1.2.2.2 skrll 151 1.2.2.2 skrll callout_init(&sc->sc_tick, CALLOUT_MPSAFE); 152 1.2.2.2 skrll callout_setfunc(&sc->sc_tick, gpiobutton_tick, sc); 153 1.2.2.2 skrll 154 1.2.2.2 skrll error = workqueue_create(&sc->sc_wq, device_xname(self), 155 1.2.2.2 skrll gpiobutton_task, sc, PRI_NONE, IPL_VM, WQ_MPSAFE); 156 1.2.2.2 skrll if (error) { 157 1.2.2.2 skrll aprint_error_dev(self, "couldn't create workqueue: %d\n", 158 1.2.2.2 skrll error); 159 1.2.2.2 skrll return; 160 1.2.2.2 skrll } 161 1.2.2.2 skrll 162 1.2.2.2 skrll gpiobutton_task(&sc->sc_work, sc); 163 1.2.2.2 skrll } 164 1.2.2.2 skrll 165 1.2.2.2 skrll static bool 166 1.2.2.2 skrll gpiobutton_is_pressed(struct gpiobutton_softc *sc) 167 1.2.2.2 skrll { 168 1.2.2.2 skrll int val; 169 1.2.2.2 skrll 170 1.2.2.2 skrll val = gpio_pin_read(sc->sc_gpio, &sc->sc_map, 0); 171 1.2.2.2 skrll if (!sc->sc_active_high) 172 1.2.2.2 skrll val = !val; 173 1.2.2.2 skrll 174 1.2.2.2 skrll return val; 175 1.2.2.2 skrll } 176 1.2.2.2 skrll 177 1.2.2.2 skrll static void 178 1.2.2.2 skrll gpiobutton_tick(void *priv) 179 1.2.2.2 skrll { 180 1.2.2.2 skrll struct gpiobutton_softc * const sc = priv; 181 1.2.2.2 skrll 182 1.2.2.2 skrll workqueue_enqueue(sc->sc_wq, &sc->sc_work, NULL); 183 1.2.2.2 skrll } 184 1.2.2.2 skrll 185 1.2.2.2 skrll static void 186 1.2.2.2 skrll gpiobutton_task(struct work *wk, void *priv) 187 1.2.2.2 skrll { 188 1.2.2.2 skrll struct gpiobutton_softc * const sc = priv; 189 1.2.2.2 skrll 190 1.2.2.2 skrll const bool new_state = gpiobutton_is_pressed(sc); 191 1.2.2.2 skrll if (new_state != sc->sc_state) { 192 1.2.2.2 skrll aprint_debug_dev(sc->sc_dev, "button pressed\n"); 193 1.2.2.2 skrll sysmon_pswitch_event(&sc->sc_smpsw, PSWITCH_EVENT_PRESSED); 194 1.2.2.2 skrll sc->sc_state = new_state; 195 1.2.2.2 skrll } 196 1.2.2.2 skrll 197 1.2.2.2 skrll callout_schedule(&sc->sc_tick, GPIOBUTTON_POLL_INTERVAL); 198 1.2.2.2 skrll } 199
Indexes created Mon Sep 29 21:09:56 GMT 2025