gpioc.c revision 299396
1/*- 2 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/dev/gpio/gpioc.c 299396 2016-05-11 00:34:43Z gonzo $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/bus.h> 33#include <sys/conf.h> 34#include <sys/gpio.h> 35#include <sys/ioccom.h> 36#include <sys/kernel.h> 37#include <sys/malloc.h> 38#include <sys/module.h> 39 40#include <dev/gpio/gpiobusvar.h> 41 42#include "gpio_if.h" 43#include "gpiobus_if.h" 44 45#undef GPIOC_DEBUG 46#ifdef GPIOC_DEBUG 47#define dprintf printf 48#else 49#define dprintf(x, arg...) 50#endif 51 52static int gpioc_probe(device_t dev); 53static int gpioc_attach(device_t dev); 54static int gpioc_detach(device_t dev); 55 56static d_ioctl_t gpioc_ioctl; 57 58static struct cdevsw gpioc_cdevsw = { 59 .d_version = D_VERSION, 60 .d_ioctl = gpioc_ioctl, 61 .d_name = "gpioc", 62}; 63 64struct gpioc_softc { 65 device_t sc_dev; /* gpiocX dev */ 66 device_t sc_pdev; /* gpioX dev */ 67 struct cdev *sc_ctl_dev; /* controller device */ 68 int sc_unit; 69}; 70 71static int 72gpioc_probe(device_t dev) 73{ 74 device_set_desc(dev, "GPIO controller"); 75 return (0); 76} 77 78static int 79gpioc_attach(device_t dev) 80{ 81 struct gpioc_softc *sc = device_get_softc(dev); 82 83 sc->sc_dev = dev; 84 sc->sc_pdev = device_get_parent(dev); 85 sc->sc_unit = device_get_unit(dev); 86 sc->sc_ctl_dev = make_dev(&gpioc_cdevsw, sc->sc_unit, 87 UID_ROOT, GID_WHEEL, 0600, "gpioc%d", sc->sc_unit); 88 if (!sc->sc_ctl_dev) { 89 printf("Failed to create gpioc%d", sc->sc_unit); 90 return (ENXIO); 91 } 92 sc->sc_ctl_dev->si_drv1 = sc; 93 94 return (0); 95} 96 97static int 98gpioc_detach(device_t dev) 99{ 100 struct gpioc_softc *sc = device_get_softc(dev); 101 int err; 102 103 if (sc->sc_ctl_dev) 104 destroy_dev(sc->sc_ctl_dev); 105 106 if ((err = bus_generic_detach(dev)) != 0) 107 return (err); 108 109 return (0); 110} 111 112static int 113gpioc_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int fflag, 114 struct thread *td) 115{ 116 device_t bus; 117 int max_pin, res; 118 struct gpioc_softc *sc = cdev->si_drv1; 119 struct gpio_pin pin; 120 struct gpio_req req; 121 uint32_t caps; 122 123 bus = GPIO_GET_BUS(sc->sc_pdev); 124 if (bus == NULL) 125 return (EINVAL); 126 switch (cmd) { 127 case GPIOMAXPIN: 128 max_pin = -1; 129 res = GPIO_PIN_MAX(sc->sc_pdev, &max_pin); 130 bcopy(&max_pin, arg, sizeof(max_pin)); 131 break; 132 case GPIOGETCONFIG: 133 bcopy(arg, &pin, sizeof(pin)); 134 dprintf("get config pin %d\n", pin.gp_pin); 135 res = GPIO_PIN_GETFLAGS(sc->sc_pdev, pin.gp_pin, 136 &pin.gp_flags); 137 /* Fail early */ 138 if (res) 139 break; 140 GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &pin.gp_caps); 141 GPIOBUS_PIN_GETNAME(bus, pin.gp_pin, pin.gp_name); 142 bcopy(&pin, arg, sizeof(pin)); 143 break; 144 case GPIOSETCONFIG: 145 bcopy(arg, &pin, sizeof(pin)); 146 dprintf("set config pin %d\n", pin.gp_pin); 147 res = GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &caps); 148 if (res == 0) 149 res = gpio_check_flags(caps, pin.gp_flags); 150 if (res == 0) 151 res = GPIO_PIN_SETFLAGS(sc->sc_pdev, pin.gp_pin, 152 pin.gp_flags); 153 break; 154 case GPIOGET: 155 bcopy(arg, &req, sizeof(req)); 156 res = GPIO_PIN_GET(sc->sc_pdev, req.gp_pin, 157 &req.gp_value); 158 dprintf("read pin %d -> %d\n", 159 req.gp_pin, req.gp_value); 160 bcopy(&req, arg, sizeof(req)); 161 break; 162 case GPIOSET: 163 bcopy(arg, &req, sizeof(req)); 164 res = GPIO_PIN_SET(sc->sc_pdev, req.gp_pin, 165 req.gp_value); 166 dprintf("write pin %d -> %d\n", 167 req.gp_pin, req.gp_value); 168 break; 169 case GPIOTOGGLE: 170 bcopy(arg, &req, sizeof(req)); 171 dprintf("toggle pin %d\n", 172 req.gp_pin); 173 res = GPIO_PIN_TOGGLE(sc->sc_pdev, req.gp_pin); 174 break; 175 case GPIOSETNAME: 176 bcopy(arg, &pin, sizeof(pin)); 177 dprintf("set name on pin %d\n", pin.gp_pin); 178 res = GPIOBUS_PIN_SETNAME(bus, pin.gp_pin, 179 pin.gp_name); 180 break; 181 default: 182 return (ENOTTY); 183 break; 184 } 185 186 return (res); 187} 188 189static device_method_t gpioc_methods[] = { 190 /* Device interface */ 191 DEVMETHOD(device_probe, gpioc_probe), 192 DEVMETHOD(device_attach, gpioc_attach), 193 DEVMETHOD(device_detach, gpioc_detach), 194 DEVMETHOD(device_shutdown, bus_generic_shutdown), 195 DEVMETHOD(device_suspend, bus_generic_suspend), 196 DEVMETHOD(device_resume, bus_generic_resume), 197 198 DEVMETHOD_END 199}; 200 201driver_t gpioc_driver = { 202 "gpioc", 203 gpioc_methods, 204 sizeof(struct gpioc_softc) 205}; 206 207devclass_t gpioc_devclass; 208 209DRIVER_MODULE(gpioc, gpio, gpioc_driver, gpioc_devclass, 0, 0); 210MODULE_VERSION(gpioc, 1); 211