TCA6408: Add driver for tca6408 gpio expander
Driver for tca6408 gpio expander over i2c bus. Expose API for manipulating pin's direction, state and polarity inversion. Obtained from: Semihalf Sponsored by: Alstom Group Differential revision: https://reviews.freebsd.org/D32819
This commit is contained in:
Hubert Mazur
Wojciech Macek
parent
0f84feb9fb
commit
cb35af13f9
@ -8,6 +8,7 @@ options SOC_NXP_LS
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# I2C
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device pca9547 # NPX I2C bus multiplexer
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device pcf8563 # NXP Real-time clock/calendar
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device tca6408 # NXP I2C gpio expander
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# Serial (COM) ports
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device uart_ns8250 # ns8250-type UART driver
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@ -1870,6 +1870,7 @@ dev/iicbus/rtc/rx8803.c optional rx8803 iicbus fdt
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dev/iicbus/s35390a.c optional s35390a
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dev/iicbus/sy8106a.c optional sy8106a ext_resources fdt
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dev/iicbus/syr827.c optional syr827 ext_resources fdt
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dev/iicbus/gpio/tca6408.c optional tca6408 fdt gpio
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dev/iicbus/gpio/tca6416.c optional tca6416 fdt
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dev/iicbus/pmic/fan53555.c optional fan53555 ext_resources fdt
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dev/iir/iir.c optional iir
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380
sys/dev/iicbus/gpio/tca6408.c
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380
sys/dev/iicbus/gpio/tca6408.c
Normal file
@ -0,0 +1,380 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2021 Alstom Group.
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* Copyright (c) 2021 Semihalf.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/gpio.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/gpio/gpiobusvar.h>
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#define BIT(x) (1UL << (x))
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#define TCA6408_READ_REG 0x0
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#define TCA6408_WRITE_REG 0x1
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#define TCA6408_POLARITY_REG 0x2
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#define TCA6408_CONFIG_REG 0x3
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#define PINS_NUM 8
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#define PIN_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT \
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| GPIO_PIN_INVIN)
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struct tca6408_softc {
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device_t dev;
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device_t bus_dev;
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struct mtx mtx;
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};
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static int tca6408_read1(device_t dev, uint8_t offset, uint8_t *data);
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static int tca6408_write1(device_t dev, uint8_t offset, uint8_t data);
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static int tca6408_probe(device_t dev);
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static int tca6408_attach(device_t dev);
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static int tca6408_detach(device_t dev);
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static device_t tca6408_get_bus(device_t dev);
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static int tca6408_pin_max(device_t dev, int *pin);
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static int tca6408_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags);
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static int tca6408_pin_setflags(device_t dev, uint32_t pin, uint32_t flags);
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static int tca6408_pin_getname(device_t dev, uint32_t pin, char *name);
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static int tca6408_pin_get(device_t dev, uint32_t pin, unsigned int *val);
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static int tca6408_pin_set(device_t dev, uint32_t pin, unsigned int val);
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static int tca6408_pin_toggle(device_t dev, uint32_t pin);
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static int tca6408_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps);
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static device_method_t tca6408_methods[] = {
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DEVMETHOD(device_probe, tca6408_probe),
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DEVMETHOD(device_attach, tca6408_attach),
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DEVMETHOD(device_detach, tca6408_detach),
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DEVMETHOD(gpio_get_bus, tca6408_get_bus),
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DEVMETHOD(gpio_pin_max, tca6408_pin_max),
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DEVMETHOD(gpio_pin_getflags, tca6408_pin_getflags),
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DEVMETHOD(gpio_pin_setflags, tca6408_pin_setflags),
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DEVMETHOD(gpio_pin_getname, tca6408_pin_getname),
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DEVMETHOD(gpio_pin_get, tca6408_pin_get),
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DEVMETHOD(gpio_pin_set, tca6408_pin_set),
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DEVMETHOD(gpio_pin_toggle, tca6408_pin_toggle),
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DEVMETHOD(gpio_pin_getcaps, tca6408_pin_getcaps),
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DEVMETHOD_END
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};
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static driver_t tca6408_driver = {
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"gpio",
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tca6408_methods,
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sizeof(struct tca6408_softc)
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};
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static struct ofw_compat_data tca6408_compat_data[] = {
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{ "ti,tca6408", 1 },
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{ NULL, 0}
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};
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devclass_t tca6408_devclass;
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DRIVER_MODULE(tca6408, iicbus, tca6408_driver, tca6408_devclass, 0, 0);
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IICBUS_FDT_PNP_INFO(tca6408_compat_data);
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static int
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tca6408_read1(device_t dev, uint8_t offset, uint8_t *data)
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{
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int error;
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error = iicdev_readfrom(dev, offset, (void *) data, 1, IIC_WAIT);
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if (error != 0)
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device_printf(dev, "Failed to read from device\n");
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return (error);
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}
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static int
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tca6408_write1(device_t dev, uint8_t offset, uint8_t data)
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{
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int error;
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error = iicdev_writeto(dev, offset, (void *) &data, 1, IIC_WAIT);
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if (error != 0)
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device_printf(dev, "Failed to write to device\n");
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return (error);
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}
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static int
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tca6408_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_search_compatible(dev, tca6408_compat_data)->ocd_data)
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return (ENXIO);
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device_set_desc(dev, "TCA6408 GPIO expander");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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tca6408_attach(device_t dev)
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{
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struct tca6408_softc *sc;
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sc = device_get_softc(dev);
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sc->dev = dev;
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mtx_init(&sc->mtx, "tca6408 gpio", "gpio", MTX_DEF);
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sc->bus_dev = gpiobus_attach_bus(dev);
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if (sc->bus_dev == NULL) {
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device_printf(dev, "Could not create busdev child\n");
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return (ENXIO);
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}
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OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev);
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return (0);
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}
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static int
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tca6408_detach(device_t dev)
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{
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struct tca6408_softc *sc;
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sc = device_get_softc(dev);
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if (sc->bus_dev != NULL)
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gpiobus_detach_bus(sc->bus_dev);
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mtx_destroy(&sc->mtx);
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return (0);
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}
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static device_t
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tca6408_get_bus(device_t dev)
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{
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struct tca6408_softc *sc;
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sc = device_get_softc(dev);
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return (sc->bus_dev);
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}
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static int
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tca6408_pin_max(device_t dev, int *pin)
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{
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if (pin == NULL)
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return (EINVAL);
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*pin = PINS_NUM - 1;
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return (0);
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}
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static int
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tca6408_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
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{
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struct tca6408_softc *sc;
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uint8_t buffer;
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int error;
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if (pin >= PINS_NUM || flags == NULL)
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return (EINVAL);
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sc = device_get_softc(dev);
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error = tca6408_read1(dev, TCA6408_CONFIG_REG, &buffer);
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if (error != 0)
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return (error);
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*flags = (buffer & BIT(pin)) ? GPIO_PIN_INPUT : GPIO_PIN_OUTPUT;
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error = tca6408_read1(dev, TCA6408_POLARITY_REG, &buffer);
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if (error != 0)
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return (error);
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if (buffer & BIT(pin))
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*flags |= ((*flags & GPIO_PIN_INPUT)
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? GPIO_PIN_INVIN : GPIO_PIN_INVOUT);
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return (0);
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}
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static int
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tca6408_pin_setflags(device_t dev, uint32_t pin, unsigned int flags)
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{
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uint8_t config_buf, inv_buf;
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struct tca6408_softc *sc;
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int error;
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if (pin >= PINS_NUM)
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return (EINVAL);
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sc = device_get_softc(dev);
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mtx_lock(&sc->mtx);
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error = tca6408_read1(dev, TCA6408_CONFIG_REG, &config_buf);
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if (error != 0)
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goto fail;
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error = tca6408_read1(dev, TCA6408_POLARITY_REG, &inv_buf);
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if (error != 0)
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goto fail;
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if (flags & GPIO_PIN_INPUT)
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config_buf |= BIT(pin);
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else if (flags & GPIO_PIN_OUTPUT)
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config_buf &= ~BIT(pin);
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if (flags & GPIO_PIN_INVIN)
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inv_buf |= BIT(pin);
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else if (flags & GPIO_PIN_INVOUT)
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inv_buf &= ~BIT(pin);
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error = tca6408_write1(dev, TCA6408_CONFIG_REG, config_buf);
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if (error != 0)
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goto fail;
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error = tca6408_write1(dev, TCA6408_POLARITY_REG, inv_buf);
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fail:
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mtx_unlock(&sc->mtx);
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return (error);
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}
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static int
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tca6408_pin_getname(device_t dev, uint32_t pin, char *name)
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{
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if (pin >= PINS_NUM)
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return (EINVAL);
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snprintf(name, GPIOMAXNAME, "tca6408_gpio_pin%d\n", pin);
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return (0);
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}
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static int
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tca6408_pin_get(device_t dev, uint32_t pin, unsigned int *val)
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{
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uint8_t buffer;
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int error;
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if (pin >= PINS_NUM || val == NULL)
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return (EINVAL);
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error = tca6408_read1(dev, TCA6408_READ_REG, &buffer);
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if (error != 0)
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return (error);
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*val = buffer & BIT(pin);
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return (0);
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}
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static int
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tca6408_pin_set(device_t dev, uint32_t pin, uint32_t val)
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{
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struct tca6408_softc *sc;
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uint8_t buffer;
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int error;
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if (pin >= PINS_NUM)
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return (EINVAL);
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sc = device_get_softc(dev);
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mtx_lock(&sc->mtx);
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error = tca6408_read1(dev, TCA6408_WRITE_REG, &buffer);
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if (error != 0)
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goto fail;
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if (val != 0)
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buffer |= BIT(pin);
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else
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buffer &= ~BIT(pin);
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error = tca6408_write1(dev, TCA6408_WRITE_REG, buffer);
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fail:
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mtx_unlock(&sc->mtx);
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return (error);
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}
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static int
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tca6408_pin_toggle(device_t dev, uint32_t pin)
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{
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struct tca6408_softc *sc;
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uint8_t buffer;
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int error;
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if (pin >= PINS_NUM)
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return (EINVAL);
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sc = device_get_softc(dev);
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mtx_lock(&sc->mtx);
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error = tca6408_read1(dev, TCA6408_WRITE_REG, &buffer);
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if (error)
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goto fail;
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buffer ^= BIT(pin);
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error = tca6408_write1(dev, TCA6408_WRITE_REG, buffer);
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fail:
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mtx_unlock(&sc->mtx);
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return (error);
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}
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static int
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tca6408_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
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{
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if (pin >= PINS_NUM)
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return (EINVAL);
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*caps = PIN_CAPS;
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return (0);
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}
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