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sys/dev/gpio/gpioiic_fdt.c
- This file was added.
| /*- | |||||
| * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org> | |||||
| * Copyright (c) 2010 Luiz Otavio O Souza | |||||
| * Copyright (c) 2017 Hiroki Mori | |||||
| * All rights reserved. | |||||
| * | |||||
| * Redistribution and use in source and binary forms, with or without | |||||
| * modification, are permitted provided that the following conditions | |||||
| * are met: | |||||
| * 1. Redistributions of source code must retain the above copyright | |||||
| * notice, this list of conditions and the following disclaimer. | |||||
| * 2. Redistributions in binary form must reproduce the above copyright | |||||
| * notice, this list of conditions and the following disclaimer in the | |||||
| * documentation and/or other materials provided with the distribution. | |||||
| * | |||||
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
| * SUCH DAMAGE. | |||||
| */ | |||||
| #include <sys/cdefs.h> | |||||
| __FBSDID("$FreeBSD$"); | |||||
| #include "opt_platform.h" | |||||
| #include <sys/param.h> | |||||
| #include <sys/systm.h> | |||||
| #include <sys/bus.h> | |||||
| #include <sys/gpio.h> | |||||
| #include <sys/kernel.h> | |||||
| #include <sys/module.h> | |||||
| #include <dev/fdt/fdt_common.h> | |||||
| #include <dev/ofw/ofw_bus.h> | |||||
| #include <dev/gpio/gpiobusvar.h> | |||||
| #include <dev/iicbus/iiconf.h> | |||||
| #include <dev/iicbus/iicbus.h> | |||||
| #include "gpiobus_if.h" | |||||
| #include "iicbb_if.h" | |||||
| #define GPIOIIC_SCL_DFLT 0 | |||||
| #define GPIOIIC_SDA_DFLT 1 | |||||
| #define GPIOIIC_MIN_PINS 2 | |||||
| struct gpioiic_softc | |||||
| { | |||||
| device_t sc_dev; | |||||
| device_t sc_busdev; | |||||
| gpio_pin_t scl_pin; | |||||
| gpio_pin_t sda_pin; | |||||
| }; | |||||
| static int gpioiic_probe(device_t); | |||||
| static int gpioiic_attach(device_t); | |||||
| /* iicbb interface */ | |||||
| static void gpioiic_reset_bus(device_t); | |||||
| static void gpioiic_setsda(device_t, int); | |||||
| static void gpioiic_setscl(device_t, int); | |||||
| static int gpioiic_getsda(device_t); | |||||
| static int gpioiic_getscl(device_t); | |||||
| static int gpioiic_reset(device_t, u_char, u_char, u_char *); | |||||
| static int | |||||
| gpioiic_probe(device_t dev) | |||||
| { | |||||
| if (!ofw_bus_status_okay(dev)) | |||||
| return (ENXIO); | |||||
| if (!ofw_bus_is_compatible(dev, "gpioiic")) | |||||
| return (ENXIO); | |||||
| device_set_desc(dev, "GPIO I2C bit-banging FDT driver"); | |||||
| return (BUS_PROBE_DEFAULT); | |||||
| } | |||||
| static int | |||||
| gpioiic_attach(device_t dev) | |||||
| { | |||||
| device_t bitbang; | |||||
| phandle_t node; | |||||
| int err; | |||||
| struct gpioiic_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| sc->sc_dev = dev; | |||||
| sc->sc_busdev = device_get_parent(dev); | |||||
| node = ofw_bus_get_node(sc->sc_dev); | |||||
| err = gpio_pin_get_by_ofw_name(sc->sc_dev, node, "scl", &sc->scl_pin); | |||||
| if (err != 0) { | |||||
| device_printf(sc->sc_dev, "cannot get pin scl\n"); | |||||
| return (ENXIO); | |||||
| } | |||||
| err = gpio_pin_get_by_ofw_name(sc->sc_dev, node, "sda", &sc->sda_pin); | |||||
| if (err != 0) { | |||||
| device_printf(sc->sc_dev, "cannot get pin sda\n"); | |||||
| return (ENXIO); | |||||
| } | |||||
| /* add generic bit-banging code */ | |||||
| bitbang = device_add_child(dev, "iicbb", -1); | |||||
| device_probe_and_attach(bitbang); | |||||
| return (0); | |||||
| } | |||||
| /* | |||||
| * Reset bus by setting SDA first and then SCL. | |||||
| * Must always be called with gpio bus locked. | |||||
| */ | |||||
| static void | |||||
| gpioiic_reset_bus(device_t dev) | |||||
| { | |||||
| struct gpioiic_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| gpio_pin_setflags(sc->sda_pin, GPIO_PIN_INPUT); | |||||
| gpio_pin_setflags(sc->scl_pin, GPIO_PIN_INPUT); | |||||
| } | |||||
| static void | |||||
| gpioiic_setsda(device_t dev, int val) | |||||
| { | |||||
| struct gpioiic_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| if (val == 0) { | |||||
| gpio_pin_set_active(sc->sda_pin, 0); | |||||
| gpio_pin_setflags(sc->sda_pin, GPIO_PIN_OUTPUT); | |||||
| } else { | |||||
| gpio_pin_set_active(sc->sda_pin, 1); | |||||
| gpio_pin_setflags(sc->sda_pin, GPIO_PIN_OUTPUT); | |||||
| } | |||||
| } | |||||
| static void | |||||
| gpioiic_setscl(device_t dev, int val) | |||||
| { | |||||
| struct gpioiic_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| if (val == 0) { | |||||
| gpio_pin_set_active(sc->scl_pin, 0); | |||||
| gpio_pin_setflags(sc->scl_pin, GPIO_PIN_OUTPUT); | |||||
| } else { | |||||
| gpio_pin_set_active(sc->scl_pin, 1); | |||||
| gpio_pin_setflags(sc->scl_pin, GPIO_PIN_OUTPUT); | |||||
| } | |||||
| } | |||||
| static int | |||||
| gpioiic_getscl(device_t dev) | |||||
| { | |||||
| struct gpioiic_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| bool val; | |||||
| gpio_pin_setflags(sc->scl_pin, GPIO_PIN_INPUT); | |||||
| gpio_pin_is_active(sc->scl_pin, &val); | |||||
| return ((int)val); | |||||
| } | |||||
| static int | |||||
| gpioiic_getsda(device_t dev) | |||||
| { | |||||
| struct gpioiic_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| bool val; | |||||
| gpio_pin_setflags(sc->sda_pin, GPIO_PIN_INPUT); | |||||
| gpio_pin_is_active(sc->sda_pin, &val); | |||||
| return ((int)val); | |||||
| } | |||||
| static int | |||||
| gpioiic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr) | |||||
| { | |||||
| struct gpioiic_softc *sc; | |||||
| sc = device_get_softc(dev); | |||||
| gpioiic_reset_bus(sc->sc_dev); | |||||
| return (IIC_ENOADDR); | |||||
| } | |||||
| static phandle_t | |||||
| gpioiic_get_node(device_t bus, device_t dev) | |||||
| { | |||||
| /* We only have one child, the iicbb, which needs our own node. */ | |||||
| return (ofw_bus_get_node(bus)); | |||||
| } | |||||
| static devclass_t gpioiic_devclass; | |||||
| static device_method_t gpioiic_methods[] = { | |||||
| /* Device interface */ | |||||
| DEVMETHOD(device_probe, gpioiic_probe), | |||||
| DEVMETHOD(device_attach, gpioiic_attach), | |||||
| DEVMETHOD(device_detach, bus_generic_detach), | |||||
| /* iicbb interface */ | |||||
| DEVMETHOD(iicbb_setsda, gpioiic_setsda), | |||||
| DEVMETHOD(iicbb_setscl, gpioiic_setscl), | |||||
| DEVMETHOD(iicbb_getsda, gpioiic_getsda), | |||||
| DEVMETHOD(iicbb_getscl, gpioiic_getscl), | |||||
| DEVMETHOD(iicbb_reset, gpioiic_reset), | |||||
| /* OFW bus interface */ | |||||
| DEVMETHOD(ofw_bus_get_node, gpioiic_get_node), | |||||
| DEVMETHOD_END | |||||
| }; | |||||
| static driver_t gpioiic_driver = { | |||||
| "gpioiic", | |||||
| gpioiic_methods, | |||||
| sizeof(struct gpioiic_softc), | |||||
| }; | |||||
| DRIVER_MODULE(gpioiic, ofwbus, gpioiic_driver, gpioiic_devclass, 0, 0); | |||||
| DRIVER_MODULE(gpioiic, gpiobus, gpioiic_driver, gpioiic_devclass, 0, 0); | |||||
| DRIVER_MODULE(iicbb, gpioiic, iicbb_driver, iicbb_devclass, 0, 0); | |||||
| MODULE_DEPEND(gpioiic, iicbb, IICBB_MINVER, IICBB_PREFVER, IICBB_MAXVER); | |||||
| MODULE_DEPEND(gpioiic, gpiobus, 1, 1, 1); | |||||