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 #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 52 static int gpioc_probe(device_t dev); 53 static int gpioc_attach(device_t dev); 54 static int gpioc_detach(device_t dev); 55 56 static d_ioctl_t gpioc_ioctl; 57 58 static struct cdevsw gpioc_cdevsw = { 59 .d_version = D_VERSION, 60 .d_ioctl = gpioc_ioctl, 61 .d_name = "gpioc", 62 }; 63 64 struct 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 71 static int 72 gpioc_probe(device_t dev) 73 { 74 device_set_desc(dev, "GPIO controller"); 75 return (0); 76 } 77 78 static int 79 gpioc_attach(device_t dev) 80 { 81 int err; 82 struct gpioc_softc *sc; 83 struct make_dev_args devargs; 84 85 sc = device_get_softc(dev); 86 sc->sc_dev = dev; 87 sc->sc_pdev = device_get_parent(dev); 88 sc->sc_unit = device_get_unit(dev); 89 make_dev_args_init(&devargs); 90 devargs.mda_devsw = &gpioc_cdevsw; 91 devargs.mda_uid = UID_ROOT; 92 devargs.mda_gid = GID_WHEEL; 93 devargs.mda_mode = 0600; 94 devargs.mda_si_drv1 = sc; 95 err = make_dev_s(&devargs, &sc->sc_ctl_dev, "gpioc%d", sc->sc_unit); 96 if (err != 0) { 97 printf("Failed to create gpioc%d", sc->sc_unit); 98 return (ENXIO); 99 } 100 101 return (0); 102 } 103 104 static int 105 gpioc_detach(device_t dev) 106 { 107 struct gpioc_softc *sc = device_get_softc(dev); 108 int err; 109 110 if (sc->sc_ctl_dev) 111 destroy_dev(sc->sc_ctl_dev); 112 113 if ((err = bus_generic_detach(dev)) != 0) 114 return (err); 115 116 return (0); 117 } 118 119 static int 120 gpioc_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int fflag, 121 struct thread *td) 122 { 123 device_t bus; 124 int max_pin, res; 125 struct gpioc_softc *sc = cdev->si_drv1; 126 struct gpio_pin pin; 127 struct gpio_req req; 128 uint32_t caps; 129 130 bus = GPIO_GET_BUS(sc->sc_pdev); 131 if (bus == NULL) 132 return (EINVAL); 133 switch (cmd) { 134 case GPIOMAXPIN: 135 max_pin = -1; 136 res = GPIO_PIN_MAX(sc->sc_pdev, &max_pin); 137 bcopy(&max_pin, arg, sizeof(max_pin)); 138 break; 139 case GPIOGETCONFIG: 140 bcopy(arg, &pin, sizeof(pin)); 141 dprintf("get config pin %d\n", pin.gp_pin); 142 res = GPIO_PIN_GETFLAGS(sc->sc_pdev, pin.gp_pin, 143 &pin.gp_flags); 144 /* Fail early */ 145 if (res) 146 break; 147 GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &pin.gp_caps); 148 GPIOBUS_PIN_GETNAME(bus, pin.gp_pin, pin.gp_name); 149 bcopy(&pin, arg, sizeof(pin)); 150 break; 151 case GPIOSETCONFIG: 152 bcopy(arg, &pin, sizeof(pin)); 153 dprintf("set config pin %d\n", pin.gp_pin); 154 res = GPIO_PIN_GETCAPS(sc->sc_pdev, pin.gp_pin, &caps); 155 if (res == 0) 156 res = gpio_check_flags(caps, pin.gp_flags); 157 if (res == 0) 158 res = GPIO_PIN_SETFLAGS(sc->sc_pdev, pin.gp_pin, 159 pin.gp_flags); 160 break; 161 case GPIOGET: 162 bcopy(arg, &req, sizeof(req)); 163 res = GPIO_PIN_GET(sc->sc_pdev, req.gp_pin, 164 &req.gp_value); 165 dprintf("read pin %d -> %d\n", 166 req.gp_pin, req.gp_value); 167 bcopy(&req, arg, sizeof(req)); 168 break; 169 case GPIOSET: 170 bcopy(arg, &req, sizeof(req)); 171 res = GPIO_PIN_SET(sc->sc_pdev, req.gp_pin, 172 req.gp_value); 173 dprintf("write pin %d -> %d\n", 174 req.gp_pin, req.gp_value); 175 break; 176 case GPIOTOGGLE: 177 bcopy(arg, &req, sizeof(req)); 178 dprintf("toggle pin %d\n", 179 req.gp_pin); 180 res = GPIO_PIN_TOGGLE(sc->sc_pdev, req.gp_pin); 181 break; 182 case GPIOSETNAME: 183 bcopy(arg, &pin, sizeof(pin)); 184 dprintf("set name on pin %d\n", pin.gp_pin); 185 res = GPIOBUS_PIN_SETNAME(bus, pin.gp_pin, 186 pin.gp_name); 187 break; 188 default: 189 return (ENOTTY); 190 break; 191 } 192 193 return (res); 194 } 195 196 static device_method_t gpioc_methods[] = { 197 /* Device interface */ 198 DEVMETHOD(device_probe, gpioc_probe), 199 DEVMETHOD(device_attach, gpioc_attach), 200 DEVMETHOD(device_detach, gpioc_detach), 201 DEVMETHOD(device_shutdown, bus_generic_shutdown), 202 DEVMETHOD(device_suspend, bus_generic_suspend), 203 DEVMETHOD(device_resume, bus_generic_resume), 204 205 DEVMETHOD_END 206 }; 207 208 driver_t gpioc_driver = { 209 "gpioc", 210 gpioc_methods, 211 sizeof(struct gpioc_softc) 212 }; 213 214 devclass_t gpioc_devclass; 215 216 DRIVER_MODULE(gpioc, gpio, gpioc_driver, gpioc_devclass, 0, 0); 217 MODULE_VERSION(gpioc, 1); 218