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("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/types.h> 33 34 #include <sys/bus.h> 35 #include <sys/conf.h> 36 #include <sys/ioccom.h> 37 #include <sys/kernel.h> 38 #include <sys/malloc.h> 39 #include <sys/module.h> 40 #include <sys/queue.h> 41 #include <machine/bus.h> 42 #include <machine/resource.h> 43 44 #include <sys/gpio.h> 45 #include "gpio_if.h" 46 47 #undef GPIOC_DEBUG 48 #ifdef GPIOC_DEBUG 49 #define dprintf printf 50 #else 51 #define dprintf(x, arg...) 52 #endif 53 54 static int gpioc_probe(device_t dev); 55 static int gpioc_attach(device_t dev); 56 static int gpioc_detach(device_t dev); 57 58 static d_ioctl_t gpioc_ioctl; 59 60 static struct cdevsw gpioc_cdevsw = { 61 .d_version = D_VERSION, 62 .d_ioctl = gpioc_ioctl, 63 .d_name = "gpioc", 64 }; 65 66 struct gpioc_softc { 67 device_t sc_dev; /* gpiocX dev */ 68 device_t sc_pdev; /* gpioX dev */ 69 struct cdev *sc_ctl_dev; /* controller device */ 70 int sc_unit; 71 }; 72 73 static int 74 gpioc_probe(device_t dev) 75 { 76 device_set_desc(dev, "GPIO controller"); 77 return (0); 78 } 79 80 static int 81 gpioc_attach(device_t dev) 82 { 83 struct gpioc_softc *sc = device_get_softc(dev); 84 85 sc->sc_dev = dev; 86 sc->sc_pdev = device_get_parent(dev); 87 sc->sc_unit = device_get_unit(dev); 88 sc->sc_ctl_dev = make_dev(&gpioc_cdevsw, sc->sc_unit, 89 UID_ROOT, GID_WHEEL, 0600, "gpioc%d", sc->sc_unit); 90 if (!sc->sc_ctl_dev) { 91 printf("Failed to create gpioc%d", sc->sc_unit); 92 return (ENXIO); 93 } 94 sc->sc_ctl_dev->si_drv1 = sc; 95 96 return (0); 97 } 98 99 static int 100 gpioc_detach(device_t dev) 101 { 102 struct gpioc_softc *sc = device_get_softc(dev); 103 int err; 104 105 if (sc->sc_ctl_dev) 106 destroy_dev(sc->sc_ctl_dev); 107 108 if ((err = bus_generic_detach(dev)) != 0) 109 return (err); 110 111 return (0); 112 } 113 114 static int 115 gpioc_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int fflag, 116 struct thread *td) 117 { 118 int max_pin, res; 119 struct gpioc_softc *sc = cdev->si_drv1; 120 struct gpio_pin pin; 121 struct gpio_req req; 122 123 switch (cmd) { 124 case GPIOMAXPIN: 125 max_pin = -1; 126 res = GPIO_PIN_MAX(sc->sc_pdev, &max_pin); 127 bcopy(&max_pin, arg, sizeof(max_pin)); 128 break; 129 case GPIOGETCONFIG: 130 bcopy(arg, &pin, sizeof(pin)); 131 dprintf("get config pin %d\n", pin.gp_pin); 132 res = GPIO_PIN_GETFLAGS(sc->sc_pdev, pin.gp_pin, 133 &pin.gp_flags); 134 /* Fail early */ 135 if (res) 136 break; 137 GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &pin.gp_caps); 138 GPIO_PIN_GETNAME(sc->sc_pdev, pin.gp_pin, pin.gp_name); 139 bcopy(&pin, arg, sizeof(pin)); 140 break; 141 case GPIOSETCONFIG: 142 bcopy(arg, &pin, sizeof(pin)); 143 dprintf("set config pin %d\n", pin.gp_pin); 144 res = GPIO_PIN_SETFLAGS(sc->sc_pdev, pin.gp_pin, 145 pin.gp_flags); 146 break; 147 case GPIOGET: 148 bcopy(arg, &req, sizeof(req)); 149 res = GPIO_PIN_GET(sc->sc_pdev, req.gp_pin, 150 &req.gp_value); 151 dprintf("read pin %d -> %d\n", 152 req.gp_pin, req.gp_value); 153 bcopy(&req, arg, sizeof(req)); 154 break; 155 case GPIOSET: 156 bcopy(arg, &req, sizeof(req)); 157 res = GPIO_PIN_SET(sc->sc_pdev, req.gp_pin, 158 req.gp_value); 159 dprintf("write pin %d -> %d\n", 160 req.gp_pin, req.gp_value); 161 break; 162 case GPIOTOGGLE: 163 bcopy(arg, &req, sizeof(req)); 164 dprintf("toggle pin %d\n", 165 req.gp_pin); 166 res = GPIO_PIN_TOGGLE(sc->sc_pdev, req.gp_pin); 167 break; 168 default: 169 return (ENOTTY); 170 break; 171 } 172 173 return (res); 174 } 175 176 static device_method_t gpioc_methods[] = { 177 /* Device interface */ 178 DEVMETHOD(device_probe, gpioc_probe), 179 DEVMETHOD(device_attach, gpioc_attach), 180 DEVMETHOD(device_detach, gpioc_detach), 181 DEVMETHOD(device_shutdown, bus_generic_shutdown), 182 DEVMETHOD(device_suspend, bus_generic_suspend), 183 DEVMETHOD(device_resume, bus_generic_resume), 184 185 { 0, 0 } 186 }; 187 188 driver_t gpioc_driver = { 189 "gpioc", 190 gpioc_methods, 191 sizeof(struct gpioc_softc) 192 }; 193 194 devclass_t gpioc_devclass; 195 196 DRIVER_MODULE(gpioc, gpio, gpioc_driver, gpioc_devclass, 0, 0); 197 MODULE_VERSION(gpioc, 1); 198