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Apply the following automated changes to try to eliminate no-longer-needed sys/cdefs.h includes as well as now-empty blank lines in a row. Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/ Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/ Remove /\n+#if.*\n#endif.*\n+/ Remove /^#if.*\n#endif.*\n/ Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/ Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/ Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/ Sponsored by: Netflix
640 lines
15 KiB
C
640 lines
15 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020 Alstom Group.
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* Copyright (c) 2020 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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/*
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* Driver for TI TCA64XX I2C GPIO expander module.
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*
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* This driver only supports basic functionality
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* (interrupt handling and polarity inversion were omitted).
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*/
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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 <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.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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#include "gpio_if.h"
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/* Base addresses of registers. LSB omitted. */
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#define TCA64XX_PINS_PER_REG 8
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#define TCA64XX_BIT_FROM_PIN(pin) (pin % TCA64XX_PINS_PER_REG)
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#define TCA64XX_REG_ADDR(pin, baseaddr) (baseaddr | (pin / \
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TCA64XX_PINS_PER_REG))
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#define TCA64XX_PIN_CAPS (GPIO_PIN_OUTPUT | GPIO_PIN_INPUT \
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| GPIO_PIN_PUSHPULL | GPIO_PIN_INVIN)
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#define TCA6416_IN_PORT_REG 0x0
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#define TCA6416_OUT_PORT_REG 0x2
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#define TCA6416_POLARITY_INV_REG 0x4
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#define TCA6416_CONF_REG 0x6
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#define TCA6416_NUM_PINS 16
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#define TCA6408_IN_PORT_REG 0x0
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#define TCA6408_OUT_PORT_REG 0x1
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#define TCA6408_POLARITY_INV_REG 0x2
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#define TCA6408_CONF_REG 0x3
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#define TCA6408_NUM_PINS 8
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#ifdef DEBUG
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#define dbg_dev_printf(dev, fmt, args...) \
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device_printf(dev, fmt, ##args)
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#else
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#define dbg_dev_printf(dev, fmt, args...)
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#endif
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enum chip_type{
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TCA6416_TYPE = 1,
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TCA6408_TYPE
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};
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struct tca64xx_softc {
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device_t dev;
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device_t busdev;
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enum chip_type chip;
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struct mtx mtx;
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uint32_t addr;
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uint8_t num_pins;
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uint8_t in_port_reg;
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uint8_t out_port_reg;
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uint8_t polarity_inv_reg;
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uint8_t conf_reg;
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uint8_t pin_caps;
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};
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static int tca64xx_read(device_t, uint8_t, uint8_t *);
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static int tca64xx_write(device_t, uint8_t, uint8_t);
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static int tca64xx_probe(device_t);
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static int tca64xx_attach(device_t);
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static int tca64xx_detach(device_t);
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static device_t tca64xx_get_bus(device_t);
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static int tca64xx_pin_max(device_t, int *);
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static int tca64xx_pin_getcaps(device_t, uint32_t, uint32_t *);
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static int tca64xx_pin_getflags(device_t, uint32_t, uint32_t *);
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static int tca64xx_pin_setflags(device_t, uint32_t, uint32_t);
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static int tca64xx_pin_getname(device_t, uint32_t, char *);
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static int tca64xx_pin_get(device_t, uint32_t, unsigned int *);
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static int tca64xx_pin_set(device_t, uint32_t, unsigned int);
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static int tca64xx_pin_toggle(device_t, uint32_t);
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#ifdef DEBUG
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static void tca6408_regdump_setup(device_t dev);
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static void tca6416_regdump_setup(device_t dev);
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static int tca64xx_regdump_sysctl(SYSCTL_HANDLER_ARGS);
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#endif
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static device_method_t tca64xx_methods[] = {
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DEVMETHOD(device_probe, tca64xx_probe),
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DEVMETHOD(device_attach, tca64xx_attach),
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DEVMETHOD(device_detach, tca64xx_detach),
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/* GPIO methods */
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DEVMETHOD(gpio_get_bus, tca64xx_get_bus),
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DEVMETHOD(gpio_pin_max, tca64xx_pin_max),
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DEVMETHOD(gpio_pin_getcaps, tca64xx_pin_getcaps),
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DEVMETHOD(gpio_pin_getflags, tca64xx_pin_getflags),
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DEVMETHOD(gpio_pin_setflags, tca64xx_pin_setflags),
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DEVMETHOD(gpio_pin_getname, tca64xx_pin_getname),
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DEVMETHOD(gpio_pin_get, tca64xx_pin_get),
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DEVMETHOD(gpio_pin_set, tca64xx_pin_set),
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DEVMETHOD(gpio_pin_toggle, tca64xx_pin_toggle),
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DEVMETHOD_END
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};
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static driver_t tca64xx_driver = {
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"gpio",
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tca64xx_methods,
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sizeof(struct tca64xx_softc)
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};
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DRIVER_MODULE(tca64xx, iicbus, tca64xx_driver, 0, 0);
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MODULE_VERSION(tca64xx, 1);
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static struct ofw_compat_data compat_data[] = {
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{"nxp,pca9555", TCA6416_TYPE},
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{"ti,tca6408", TCA6408_TYPE},
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{"ti,tca6416", TCA6416_TYPE},
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{"ti,tca9539", TCA6416_TYPE},
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{0,0}
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};
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static int
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tca64xx_read(device_t dev, uint8_t reg, uint8_t *data)
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{
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struct iic_msg msgs[2];
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struct tca64xx_softc *sc;
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int error;
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sc = device_get_softc(dev);
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if (data == NULL)
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return (EINVAL);
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msgs[0].slave = sc->addr;
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msgs[0].flags = IIC_M_WR | IIC_M_NOSTOP;
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msgs[0].len = 1;
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msgs[0].buf = ®
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msgs[1].slave = sc->addr;
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msgs[1].flags = IIC_M_RD;
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msgs[1].len = 1;
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msgs[1].buf = data;
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error = iicbus_transfer_excl(dev, msgs, 2, IIC_WAIT);
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return (iic2errno(error));
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}
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static int
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tca64xx_write(device_t dev, uint8_t reg, uint8_t val)
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{
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struct iic_msg msg;
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struct tca64xx_softc *sc;
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int error;
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uint8_t buffer[2] = {reg, val};
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sc = device_get_softc(dev);
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msg.slave = sc->addr;
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msg.flags = IIC_M_WR;
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msg.len = 2;
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msg.buf = buffer;
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error = iicbus_transfer_excl(dev, &msg, 1, IIC_WAIT);
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return (iic2errno(error));
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}
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static int
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tca64xx_probe(device_t dev)
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{
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const struct ofw_compat_data *compat_ptr;
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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compat_ptr = ofw_bus_search_compatible(dev, compat_data);
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switch (compat_ptr->ocd_data) {
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case TCA6416_TYPE:
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device_set_desc(dev, "TCA6416 I/O expander");
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break;
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case TCA6408_TYPE:
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device_set_desc(dev, "TCA6408 I/O expander");
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break;
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default:
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return (ENXIO);
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}
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return (BUS_PROBE_DEFAULT);
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}
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static int
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tca64xx_attach(device_t dev)
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{
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struct tca64xx_softc *sc;
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const struct ofw_compat_data *compat_ptr;
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sc = device_get_softc(dev);
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compat_ptr = ofw_bus_search_compatible(dev, compat_data);
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switch (compat_ptr->ocd_data) {
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case TCA6416_TYPE:
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sc->in_port_reg = TCA6416_IN_PORT_REG;
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sc->out_port_reg = TCA6416_OUT_PORT_REG;
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sc->polarity_inv_reg = TCA6416_POLARITY_INV_REG;
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sc->conf_reg = TCA6416_CONF_REG;
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sc->num_pins = TCA6416_NUM_PINS;
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break;
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case TCA6408_TYPE:
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sc->in_port_reg = TCA6408_IN_PORT_REG;
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sc->out_port_reg = TCA6408_OUT_PORT_REG;
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sc->polarity_inv_reg = TCA6408_POLARITY_INV_REG;
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sc->conf_reg = TCA6408_CONF_REG;
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sc->num_pins = TCA6408_NUM_PINS;
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break;
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default:
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__assert_unreachable();
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}
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sc->pin_caps = TCA64XX_PIN_CAPS;
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sc->chip = compat_ptr->ocd_data;
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sc->dev = dev;
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sc->addr = iicbus_get_addr(dev);
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mtx_init(&sc->mtx, "tca64xx gpio", "gpio", MTX_DEF);
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sc->busdev = gpiobus_attach_bus(dev);
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if (sc->busdev == 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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#ifdef DEBUG
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switch (sc->chip) {
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case TCA6416_TYPE:
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tca6416_regdump_setup(dev);
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break;
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case TCA6408_TYPE:
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tca6408_regdump_setup(dev);
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break;
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default:
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__assert_unreachable();
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}
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#endif
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return (0);
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}
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static int
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tca64xx_detach(device_t dev)
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{
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struct tca64xx_softc *sc;
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sc = device_get_softc(dev);
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if (sc->busdev != NULL)
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gpiobus_detach_bus(sc->busdev);
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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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tca64xx_get_bus(device_t dev)
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{
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struct tca64xx_softc *sc;
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sc = device_get_softc(dev);
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return (sc->busdev);
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}
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static int
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tca64xx_pin_max(device_t dev __unused, int *maxpin)
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{
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struct tca64xx_softc *sc;
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sc = device_get_softc(dev);
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if (maxpin == NULL)
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return (EINVAL);
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*maxpin = sc->num_pins-1;
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return (0);
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}
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static int
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tca64xx_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
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{
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struct tca64xx_softc *sc;
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sc = device_get_softc(dev);
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if (pin >= sc->num_pins || caps == NULL)
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return (EINVAL);
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*caps = sc->pin_caps;
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return (0);
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}
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static int
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tca64xx_pin_getflags(device_t dev, uint32_t pin, uint32_t *pflags)
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{
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int error;
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uint8_t bit, val, addr;
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struct tca64xx_softc *sc;
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sc = device_get_softc(dev);
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bit = TCA64XX_BIT_FROM_PIN(pin);
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if (pin >= sc->num_pins || pflags == NULL)
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return (EINVAL);
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addr = TCA64XX_REG_ADDR(pin, sc->conf_reg);
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error = tca64xx_read(dev, addr, &val);
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if (error != 0)
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return (error);
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*pflags = (val & (1 << bit)) ? GPIO_PIN_INPUT : GPIO_PIN_OUTPUT;
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addr = TCA64XX_REG_ADDR(pin, sc->polarity_inv_reg);
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error = tca64xx_read(dev, addr, &val);
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if (error != 0)
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return (error);
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if (val & (1 << bit))
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*pflags |= GPIO_PIN_INVIN;
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return (0);
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}
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static int
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tca64xx_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
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{
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uint8_t bit, val, addr, pins, inv_val;
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int error;
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struct tca64xx_softc *sc;
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sc = device_get_softc(dev);
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pins = sc->num_pins;
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bit = TCA64XX_BIT_FROM_PIN(pin);
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if (pin >= pins)
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return (EINVAL);
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mtx_lock(&sc->mtx);
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addr = TCA64XX_REG_ADDR(pin, sc->conf_reg);
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error = tca64xx_read(dev, addr, &val);
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if (error != 0)
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goto fail;
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addr = TCA64XX_REG_ADDR(pin, sc->polarity_inv_reg);
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error = tca64xx_read(dev, addr, &inv_val);
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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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val |= (1 << bit);
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else if (flags & GPIO_PIN_OUTPUT)
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val &= ~(1 << bit);
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if (flags & GPIO_PIN_INVIN)
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inv_val |= (1 << bit);
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else
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inv_val &= ~(1 << bit);
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addr = TCA64XX_REG_ADDR(pin, sc->conf_reg);
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error = tca64xx_write(dev, addr, val);
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if (error != 0)
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goto fail;
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addr = TCA64XX_REG_ADDR(pin, sc->polarity_inv_reg);
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error = tca64xx_write(dev, addr, inv_val);
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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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tca64xx_pin_getname(device_t dev, uint32_t pin, char *name)
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{
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struct tca64xx_softc *sc;
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sc = device_get_softc(dev);
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if (pin >= sc->num_pins || name == NULL)
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return (EINVAL);
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snprintf(name, GPIOMAXNAME, "gpio_P%d%d", pin / TCA64XX_PINS_PER_REG,
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pin % TCA64XX_PINS_PER_REG);
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return (0);
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}
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static int
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tca64xx_pin_get(device_t dev, uint32_t pin, unsigned int *pval)
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{
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uint8_t bit, addr, pins, reg_pvalue;
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int error;
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struct tca64xx_softc *sc;
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sc = device_get_softc(dev);
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pins = sc->num_pins;
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addr = TCA64XX_REG_ADDR(pin, sc->in_port_reg);
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bit = TCA64XX_BIT_FROM_PIN(pin);
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if (pin >= pins || pval == NULL)
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return (EINVAL);
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dbg_dev_printf(dev, "Reading pin %u pvalue.", pin);
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error = tca64xx_read(dev, addr, ®_pvalue);
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if (error != 0)
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return (error);
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*pval = reg_pvalue & (1 << bit) ? 1 : 0;
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return (0);
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}
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static int
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tca64xx_pin_set(device_t dev, uint32_t pin, unsigned int val)
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{
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uint8_t bit, addr, pins, value;
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int error;
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struct tca64xx_softc *sc;
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sc = device_get_softc(dev);
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pins = sc->num_pins;
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addr = TCA64XX_REG_ADDR(pin, sc->out_port_reg);
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bit = TCA64XX_BIT_FROM_PIN(pin);
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if (pin >= pins)
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return (EINVAL);
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dbg_dev_printf(dev, "Setting pin: %u to %u\n", pin, val);
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mtx_lock(&sc->mtx);
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error = tca64xx_read(dev, addr, &value);
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if (error != 0) {
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mtx_unlock(&sc->mtx);
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dbg_dev_printf(dev, "Failed to read from register.\n");
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return (error);
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}
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if (val != 0)
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value |= (1 << bit);
|
|
else
|
|
value &= ~(1 << bit);
|
|
|
|
error = tca64xx_write(dev, addr, value);
|
|
if (error != 0) {
|
|
mtx_unlock(&sc->mtx);
|
|
dbg_dev_printf(dev, "Could not write to register.\n");
|
|
return (error);
|
|
}
|
|
|
|
mtx_unlock(&sc->mtx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
tca64xx_pin_toggle(device_t dev, uint32_t pin)
|
|
{
|
|
int error;
|
|
uint8_t bit, addr, pins, value;
|
|
struct tca64xx_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
pins = sc->num_pins;
|
|
addr = TCA64XX_REG_ADDR(pin, sc->out_port_reg);
|
|
bit = TCA64XX_BIT_FROM_PIN(pin);
|
|
|
|
if (pin >= pins)
|
|
return (EINVAL);
|
|
|
|
dbg_dev_printf(dev, "Toggling pin: %d\n", pin);
|
|
|
|
mtx_lock(&sc->mtx);
|
|
|
|
error = tca64xx_read(dev, addr, &value);
|
|
if (error != 0) {
|
|
mtx_unlock(&sc->mtx);
|
|
dbg_dev_printf(dev, "Cannot read from register.\n");
|
|
return (error);
|
|
}
|
|
|
|
value ^= (1 << bit);
|
|
|
|
error = tca64xx_write(dev, addr, value);
|
|
if (error != 0) {
|
|
mtx_unlock(&sc->mtx);
|
|
dbg_dev_printf(dev, "Cannot write to register.\n");
|
|
return (error);
|
|
}
|
|
|
|
mtx_unlock(&sc->mtx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
static void
|
|
tca6416_regdump_setup(device_t dev)
|
|
{
|
|
struct sysctl_ctx_list *ctx;
|
|
struct sysctl_oid *node;
|
|
|
|
ctx = device_get_sysctl_ctx(dev);
|
|
node = device_get_sysctl_tree(dev);
|
|
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "in_reg_1",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6416_IN_PORT_REG, tca64xx_regdump_sysctl, "A", "Input port 1");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "in_reg_2",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6416_IN_PORT_REG | 1, tca64xx_regdump_sysctl, "A",
|
|
"Input port 2");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "out_reg_1",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6416_OUT_PORT_REG, tca64xx_regdump_sysctl, "A",
|
|
"Output port 1");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "out_reg_2",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6416_OUT_PORT_REG | 1, tca64xx_regdump_sysctl, "A",
|
|
"Output port 2");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "pol_inv_1",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6416_POLARITY_INV_REG, tca64xx_regdump_sysctl, "A",
|
|
"Polarity inv 1");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "pol_inv_2",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6416_POLARITY_INV_REG | 1, tca64xx_regdump_sysctl, "A",
|
|
"Polarity inv 2");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "conf_reg_1",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6416_CONF_REG, tca64xx_regdump_sysctl, "A", "Configuration 1");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "conf_reg_2",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6416_CONF_REG | 1, tca64xx_regdump_sysctl, "A",
|
|
"Configuration 2");
|
|
}
|
|
|
|
static void
|
|
tca6408_regdump_setup(device_t dev)
|
|
{
|
|
struct sysctl_ctx_list *ctx;
|
|
struct sysctl_oid *node;
|
|
|
|
ctx = device_get_sysctl_ctx(dev);
|
|
node = device_get_sysctl_tree(dev);
|
|
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "in_reg_1",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6408_IN_PORT_REG, tca64xx_regdump_sysctl, "A", "Input port 1");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "out_reg_1",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6408_OUT_PORT_REG, tca64xx_regdump_sysctl, "A",
|
|
"Output port 1");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "pol_inv_1",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6408_POLARITY_INV_REG, tca64xx_regdump_sysctl,
|
|
"A", "Polarity inv 1");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "conf_reg_1",
|
|
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
|
|
TCA6408_CONF_REG, tca64xx_regdump_sysctl, "A", "Configuration 1");
|
|
}
|
|
|
|
static int
|
|
tca64xx_regdump_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
device_t dev;
|
|
char buf[5];
|
|
int len, error;
|
|
uint8_t reg, regval;
|
|
|
|
dev = (device_t)arg1;
|
|
reg = (uint8_t)arg2;
|
|
|
|
error = tca64xx_read(dev, reg, ®val);
|
|
if (error != 0) {
|
|
return (error);
|
|
}
|
|
|
|
len = snprintf(buf, 5, "0x%02x", regval);
|
|
|
|
error = sysctl_handle_string(oidp, buf, len, req);
|
|
|
|
return (error);
|
|
}
|
|
#endif
|