294 lines
7.3 KiB
C
294 lines
7.3 KiB
C
/* $NetBSD: max77620.c,v 1.11 2021/01/27 02:29:48 thorpej Exp $ */
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/*-
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* Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: max77620.c,v 1.11 2021/01/27 02:29:48 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mutex.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/bus.h>
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#include <sys/kmem.h>
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#include <sys/gpio.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/fdt/fdtvar.h>
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#define MAX_GPIO_REG(n) (0x36 + (n))
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#define MAX_GPIO_DEBOUNCE __BITS(7,6)
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#define MAX_GPIO_INT __BITS(5,4)
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#define MAX_GPIO_OUTPUT_VAL __BIT(3)
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#define MAX_GPIO_INPUT_VAL __BIT(2)
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#define MAX_GPIO_DIR __BIT(1)
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#define MAX_GPIO_DRV __BIT(0)
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#define MAX_GPIO_COUNT 8
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struct max77620_softc {
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device_t sc_dev;
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i2c_tag_t sc_i2c;
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i2c_addr_t sc_addr;
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int sc_phandle;
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};
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struct max77620_pin {
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struct max77620_softc *pin_sc;
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int pin_num;
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int pin_flags;
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bool pin_actlo;
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};
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static const struct device_compatible_entry compat_data[] = {
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{ .compat = "maxim,max77620" },
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DEVICE_COMPAT_EOL
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};
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static uint8_t
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max77620_read(struct max77620_softc *sc, uint8_t reg, int flags)
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{
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uint8_t val = 0;
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int error;
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error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr,
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®, 1, &val, 1, flags);
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if (error != 0)
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aprint_error_dev(sc->sc_dev, "error reading reg %#x: %d\n", reg, error);
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return val;
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}
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static void
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max77620_write(struct max77620_softc *sc, uint8_t reg, uint8_t val, int flags)
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{
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int error;
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error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
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®, 1, &val, 1, flags);
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if (error != 0)
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aprint_error_dev(sc->sc_dev, "error writing reg %#x: %d\n", reg, error);
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}
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#define I2C_READ(sc, reg) max77620_read((sc), (reg), 0)
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#define I2C_WRITE(sc, reg, val) max77620_write((sc), (reg), (val), 0)
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#define I2C_LOCK(sc) iic_acquire_bus((sc)->sc_i2c, 0)
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#define I2C_UNLOCK(sc) iic_release_bus((sc)->sc_i2c, 0)
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static int
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max77620_gpio_config(struct max77620_softc *sc, int pin, int flags)
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{
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uint32_t gpio;
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KASSERT(pin >= 0 && pin < MAX_GPIO_COUNT);
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gpio = I2C_READ(sc, MAX_GPIO_REG(pin));
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switch (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
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case GPIO_PIN_INPUT:
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gpio |= MAX_GPIO_DIR;
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break;
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case GPIO_PIN_OUTPUT:
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gpio &= ~MAX_GPIO_DIR;
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break;
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default:
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return EINVAL;
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}
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switch (flags & (GPIO_PIN_PUSHPULL|GPIO_PIN_OPENDRAIN)) {
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case GPIO_PIN_PUSHPULL:
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gpio |= MAX_GPIO_DRV;
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break;
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case GPIO_PIN_OPENDRAIN:
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gpio &= ~MAX_GPIO_DRV;
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break;
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default:
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return EINVAL;
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}
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I2C_WRITE(sc, MAX_GPIO_REG(pin), gpio);
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return 0;
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}
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static void *
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max77620_gpio_acquire(device_t dev, const void *data, size_t len, int flags)
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{
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struct max77620_softc * const sc = device_private(dev);
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struct max77620_pin *gpin;
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const u_int *gpio = data;
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int error;
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if (len != 12)
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return NULL;
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const uint8_t pin = be32toh(gpio[1]) & 0xff;
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const bool actlo = (be32toh(gpio[2]) & __BIT(0)) != 0;
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const bool pushpull = (be32toh(gpio[2]) & __BIT(1)) == 0;
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const bool opendrain = (be32toh(gpio[2]) & __BIT(2)) != 0;
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if (pushpull)
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flags |= GPIO_PIN_PUSHPULL;
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if (opendrain)
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flags |= GPIO_PIN_OPENDRAIN;
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if (pin >= MAX_GPIO_COUNT)
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return NULL;
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I2C_LOCK(sc);
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error = max77620_gpio_config(sc, pin, flags);
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I2C_UNLOCK(sc);
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if (error != 0) {
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device_printf(dev, "bad pin %d config %#x\n", pin, flags);
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return NULL;
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}
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gpin = kmem_zalloc(sizeof(*gpin), KM_SLEEP);
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gpin->pin_sc = sc;
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gpin->pin_num = pin;
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gpin->pin_flags = flags;
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gpin->pin_actlo = actlo;
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return gpin;
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}
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static void
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max77620_gpio_release(device_t dev, void *priv)
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{
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struct max77620_softc * const sc = device_private(dev);
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struct max77620_pin *gpin = priv;
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I2C_LOCK(sc);
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max77620_gpio_config(sc, gpin->pin_num, GPIO_PIN_INPUT|GPIO_PIN_OPENDRAIN);
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I2C_UNLOCK(sc);
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kmem_free(gpin, sizeof(*gpin));
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}
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static int
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max77620_gpio_read(device_t dev, void *priv, bool raw)
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{
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struct max77620_softc * const sc = device_private(dev);
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struct max77620_pin *gpin = priv;
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uint8_t gpio;
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int val;
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/*
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* Performing a register read only; no need to acquire
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* the max77620 lock.
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*/
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I2C_LOCK(sc);
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gpio = I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num));
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I2C_UNLOCK(sc);
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val = __SHIFTOUT(gpio, MAX_GPIO_INPUT_VAL);
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if (!raw && gpin->pin_actlo)
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val = !val;
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#ifdef MAX77620_DEBUG
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device_printf(sc->sc_dev, "GPIO%d rd %02x (%d %d)\n",
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gpin->pin_num, gpio,
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(int)__SHIFTOUT(gpio, MAX_GPIO_INPUT_VAL), val);
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#endif
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return val;
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}
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static void
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max77620_gpio_write(device_t dev, void *priv, int val, bool raw)
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{
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struct max77620_softc * const sc = device_private(dev);
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struct max77620_pin *gpin = priv;
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uint8_t gpio;
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if (!raw && gpin->pin_actlo)
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val = !val;
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I2C_LOCK(sc);
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gpio = I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num));
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gpio &= ~MAX_GPIO_OUTPUT_VAL;
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gpio |= __SHIFTIN(val, MAX_GPIO_OUTPUT_VAL);
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#ifdef MAX77620_DEBUG
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device_printf(sc->sc_dev, "GPIO%d wr %02x -> %02x\n",
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gpin->pin_num,
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I2C_READ(sc, MAX_GPIO_REG(gpin->pin_num)), gpio);
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#endif
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I2C_WRITE(sc, MAX_GPIO_REG(gpin->pin_num), gpio);
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I2C_UNLOCK(sc);
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}
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static struct fdtbus_gpio_controller_func max77620_gpio_funcs = {
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.acquire = max77620_gpio_acquire,
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.release = max77620_gpio_release,
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.read = max77620_gpio_read,
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.write = max77620_gpio_write,
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};
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static void
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max77620_gpio_attach(struct max77620_softc *sc)
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{
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fdtbus_register_gpio_controller(sc->sc_dev, sc->sc_phandle,
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&max77620_gpio_funcs);
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}
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static int
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max77620_match(device_t parent, cfdata_t match, void *aux)
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{
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struct i2c_attach_args *ia = aux;
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int match_result;
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if (iic_use_direct_match(ia, match, compat_data, &match_result))
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return match_result;
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return 0;
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}
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static void
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max77620_attach(device_t parent, device_t self, void *aux)
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{
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struct max77620_softc * const sc = device_private(self);
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struct i2c_attach_args *ia = aux;
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sc->sc_dev = self;
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sc->sc_i2c = ia->ia_tag;
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sc->sc_addr = ia->ia_addr;
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sc->sc_phandle = ia->ia_cookie;
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aprint_naive("\n");
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aprint_normal(": MAX77620 Power Management IC\n");
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max77620_gpio_attach(sc);
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}
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CFATTACH_DECL_NEW(max77620pmic, sizeof(struct max77620_softc),
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max77620_match, max77620_attach, NULL, NULL);
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