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/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 44 #undef GPIOC_DEBUG 45 #ifdef GPIOC_DEBUG 46 #define dprintf printf 47 #else 48 #define dprintf(x, arg...) 49 #endif 50 51 static int gpioc_probe(device_t dev); 52 static int gpioc_attach(device_t dev); 53 static int gpioc_detach(device_t dev); 54 55 static d_ioctl_t gpioc_ioctl; 56 57 static struct cdevsw gpioc_cdevsw = { 58 .d_version = D_VERSION, 59 .d_ioctl = gpioc_ioctl, 60 .d_name = "gpioc", 61 }; 62 63 struct gpioc_softc { 64 device_t sc_dev; /* gpiocX dev */ 65 device_t sc_pdev; /* gpioX dev */ 66 struct cdev *sc_ctl_dev; /* controller device */ 67 int sc_unit; 68 }; 69 70 static int 71 gpioc_probe(device_t dev) 72 { 73 device_set_desc(dev, "GPIO controller"); 74 return (0); 75 } 76 77 static int 78 gpioc_attach(device_t dev) 79 { 80 struct gpioc_softc *sc = device_get_softc(dev); 81 82 sc->sc_dev = dev; 83 sc->sc_pdev = device_get_parent(dev); 84 sc->sc_unit = device_get_unit(dev); 85 sc->sc_ctl_dev = make_dev(&gpioc_cdevsw, sc->sc_unit, 86 UID_ROOT, GID_WHEEL, 0600, "gpioc%d", sc->sc_unit); 87 if (!sc->sc_ctl_dev) { 88 printf("Failed to create gpioc%d", sc->sc_unit); 89 return (ENXIO); 90 } 91 sc->sc_ctl_dev->si_drv1 = sc; 92 93 return (0); 94 } 95 96 static int 97 gpioc_detach(device_t dev) 98 { 99 struct gpioc_softc *sc = device_get_softc(dev); 100 int err; 101 102 if (sc->sc_ctl_dev) 103 destroy_dev(sc->sc_ctl_dev); 104 105 if ((err = bus_generic_detach(dev)) != 0) 106 return (err); 107 108 return (0); 109 } 110 111 static int 112 gpioc_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int fflag, 113 struct thread *td) 114 { 115 int max_pin, res; 116 struct gpioc_softc *sc = cdev->si_drv1; 117 struct gpio_pin pin; 118 struct gpio_req req; 119 uint32_t caps; 120 121 switch (cmd) { 122 case GPIOMAXPIN: 123 max_pin = -1; 124 res = GPIO_PIN_MAX(sc->sc_pdev, &max_pin); 125 bcopy(&max_pin, arg, sizeof(max_pin)); 126 break; 127 case GPIOGETCONFIG: 128 bcopy(arg, &pin, sizeof(pin)); 129 dprintf("get config pin %d\n", pin.gp_pin); 130 res = GPIO_PIN_GETFLAGS(sc->sc_pdev, pin.gp_pin, 131 &pin.gp_flags); 132 /* Fail early */ 133 if (res) 134 break; 135 GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &pin.gp_caps); 136 GPIO_PIN_GETNAME(sc->sc_pdev, pin.gp_pin, pin.gp_name); 137 bcopy(&pin, arg, sizeof(pin)); 138 break; 139 case GPIOSETCONFIG: 140 bcopy(arg, &pin, sizeof(pin)); 141 dprintf("set config pin %d\n", pin.gp_pin); 142 res = GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &caps); 143 if (res == 0) 144 res = gpio_check_flags(caps, pin.gp_flags); 145 if (res == 0) 146 res = GPIO_PIN_SETFLAGS(sc->sc_pdev, pin.gp_pin, 147 pin.gp_flags); 148 break; 149 case GPIOGET: 150 bcopy(arg, &req, sizeof(req)); 151 res = GPIO_PIN_GET(sc->sc_pdev, req.gp_pin, 152 &req.gp_value); 153 dprintf("read pin %d -> %d\n", 154 req.gp_pin, req.gp_value); 155 bcopy(&req, arg, sizeof(req)); 156 break; 157 case GPIOSET: 158 bcopy(arg, &req, sizeof(req)); 159 res = GPIO_PIN_SET(sc->sc_pdev, req.gp_pin, 160 req.gp_value); 161 dprintf("write pin %d -> %d\n", 162 req.gp_pin, req.gp_value); 163 break; 164 case GPIOTOGGLE: 165 bcopy(arg, &req, sizeof(req)); 166 dprintf("toggle pin %d\n", 167 req.gp_pin); 168 res = GPIO_PIN_TOGGLE(sc->sc_pdev, req.gp_pin); 169 break; 170 default: 171 return (ENOTTY); 172 break; 173 } 174 175 return (res); 176 } 177 178 static device_method_t gpioc_methods[] = { 179 /* Device interface */ 180 DEVMETHOD(device_probe, gpioc_probe), 181 DEVMETHOD(device_attach, gpioc_attach), 182 DEVMETHOD(device_detach, gpioc_detach), 183 DEVMETHOD(device_shutdown, bus_generic_shutdown), 184 DEVMETHOD(device_suspend, bus_generic_suspend), 185 DEVMETHOD(device_resume, bus_generic_resume), 186 187 { 0, 0 } 188 }; 189 190 driver_t gpioc_driver = { 191 "gpioc", 192 gpioc_methods, 193 sizeof(struct gpioc_softc) 194 }; 195 196 devclass_t gpioc_devclass; 197 198 DRIVER_MODULE(gpioc, gpio, gpioc_driver, gpioc_devclass, 0, 0); 199 MODULE_VERSION(gpioc, 1); 200