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https://github.com/Stichting-MINIX-Research-Foundation/netbsd.git
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344 lines
8.2 KiB
C
344 lines
8.2 KiB
C
/* $NetBSD: ioexp.c,v 1.1 2011/06/19 16:20:09 nonaka Exp $ */
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/*-
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* Copyright (c) 2011 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by NONAKA Kimihiro.
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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: ioexp.c,v 1.1 2011/06/19 16:20:09 nonaka Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/gpio.h>
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#include <dev/i2c/i2cvar.h>
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#include <arm/xscale/pxa2x0reg.h>
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#include <arm/xscale/pxa2x0var.h>
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#include <arm/xscale/pxa2x0_i2c.h>
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#include <zaurus/zaurus/zaurus_var.h>
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#include <zaurus/dev/ioexpreg.h>
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#include <zaurus/dev/ioexpvar.h>
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#include "ioconf.h"
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struct ioexp_softc {
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device_t sc_dev;
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i2c_tag_t sc_i2c;
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uint8_t sc_output;
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uint8_t sc_direction;
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int sc_inited;
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};
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static int ioexp_match(device_t, cfdata_t, void *);
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static void ioexp_attach(device_t, device_t, void *);
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CFATTACH_DECL_NEW(ioexp, sizeof(struct ioexp_softc),
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ioexp_match, ioexp_attach, NULL, NULL);
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static uint8_t output_init_value = IOEXP_IR_ON | IOEXP_AKIN_PULLUP;
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static uint8_t direction_init_value = 0;
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static __inline int
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ioexp_write(struct ioexp_softc *sc, uint8_t reg, uint8_t val)
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{
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uint8_t cmd;
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uint8_t data;
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int error;
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cmd = reg;
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data = val;
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error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, IOEXP_ADDRESS,
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&cmd, 1, &data, 1, 0);
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return error;
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}
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static int
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ioexp_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct i2c_attach_args *ia = aux;
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/* only for SL-C1000 */
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if (!ZAURUS_ISC1000)
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return 0;
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if (ia->ia_name) {
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/* direct config - check name */
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if (strcmp(ia->ia_name, "ioexp") == 0)
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return 1;
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} else {
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/* indirect config - check typical address */
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if (ia->ia_addr == IOEXP_ADDRESS)
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return 1;
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}
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return 0;
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}
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static void
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ioexp_attach(device_t parent, device_t self, void *aux)
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{
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struct ioexp_softc *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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aprint_normal(": GPIO controller\n");
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aprint_naive("\n");
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sc->sc_output = output_init_value;
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sc->sc_direction = direction_init_value;
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iic_acquire_bus(sc->sc_i2c, 0);
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ioexp_write(sc, IOEXP_POLARITY, 0);
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ioexp_write(sc, IOEXP_OUTPUT, sc->sc_output);
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ioexp_write(sc, IOEXP_DIRECTION, sc->sc_direction);
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iic_release_bus(sc->sc_i2c, 0);
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sc->sc_inited = 1;
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}
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#if 0
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static void
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ioexp_gpio_pin_ctl(struct ioexp_softc *sc, uint8_t bit, int flags,
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bool acquire_bus)
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{
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int error;
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if (acquire_bus) {
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error = iic_acquire_bus(sc->sc_i2c, 0);
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if (error) {
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aprint_error_dev(sc->sc_dev,
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"unable to acquire bus. error=%d\n", error);
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return;
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}
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}
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switch (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
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case GPIO_PIN_INPUT:
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sc->sc_direction |= bit;
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break;
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case GPIO_PIN_OUTPUT:
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sc->sc_direction &= ~bit;
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break;
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}
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error = ioexp_write(sc, IOEXP_DIRECTION, sc->sc_direction);
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if (error)
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aprint_error_dev(sc->sc_dev,
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"direction write failed. error=%d\n", error);
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if (acquire_bus)
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iic_release_bus(sc->sc_i2c, 0);
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}
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#endif
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static void
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ioexp_gpio_pin_write(struct ioexp_softc *sc, uint8_t bit, int level,
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bool acquire_bus)
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{
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int error;
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if (acquire_bus) {
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error = iic_acquire_bus(sc->sc_i2c, 0);
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if (error) {
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aprint_error_dev(sc->sc_dev,
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"unable to acquire bus. error=%d\n", error);
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return;
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}
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}
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if (level == GPIO_PIN_LOW)
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sc->sc_output &= ~bit;
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else
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sc->sc_output |= bit;
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error = ioexp_write(sc, IOEXP_OUTPUT, sc->sc_output);
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if (error)
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aprint_error_dev(sc->sc_dev,
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"output write failed. error=%d\n", error);
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if (acquire_bus)
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iic_release_bus(sc->sc_i2c, 0);
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}
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static __inline uint8_t
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ioexp_gpio_pin_get(struct ioexp_softc *sc, uint8_t bit)
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{
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return sc->sc_output & bit;
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}
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/*
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* Turn the LCD background light and contrast signal on or off.
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*/
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void
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ioexp_set_backlight(int onoff, int cont)
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{
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struct ioexp_softc *sc = device_lookup_private(&ioexp_cd, 0);
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if (sc == NULL || !sc->sc_inited) {
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#ifdef DEBUG
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aprint_error("ioexp: %s: not attached or not inited\n",
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__func__);
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#endif
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if (onoff)
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output_init_value |= IOEXP_BACKLIGHT_ON;
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else
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output_init_value &= ~IOEXP_BACKLIGHT_ON;
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/* BACKLIGHT_CONT is inverted */
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if (cont)
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output_init_value &= ~IOEXP_BACKLIGHT_CONT;
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else
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output_init_value |= IOEXP_BACKLIGHT_CONT;
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return;
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}
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if (sc != NULL) {
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uint8_t bkreg = ioexp_gpio_pin_get(sc, IOEXP_BACKLIGHT_ON);
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uint8_t contreg = ioexp_gpio_pin_get(sc, IOEXP_BACKLIGHT_CONT);
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if (onoff && !bkreg) {
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ioexp_gpio_pin_write(sc, IOEXP_BACKLIGHT_ON,
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GPIO_PIN_HIGH, true);
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} else if (!onoff && bkreg) {
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ioexp_gpio_pin_write(sc, IOEXP_BACKLIGHT_ON,
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GPIO_PIN_LOW, true);
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}
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/* BACKLIGHT_CONT is inverted */
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if (cont && contreg) {
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ioexp_gpio_pin_write(sc, IOEXP_BACKLIGHT_CONT,
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GPIO_PIN_LOW, true);
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} else if (!cont && !contreg) {
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ioexp_gpio_pin_write(sc, IOEXP_BACKLIGHT_CONT,
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GPIO_PIN_HIGH, true);
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}
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}
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}
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/*
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* Turn the infrared LED on or off (must be on while transmitting).
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*/
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void
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ioexp_set_irled(int onoff)
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{
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struct ioexp_softc *sc = device_lookup_private(&ioexp_cd, 0);
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if (sc == NULL || !sc->sc_inited) {
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#ifdef DEBUG
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aprint_error("ioexp: %s: not attached or not inited\n",
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__func__);
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#endif
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/* IR_ON is inverted */
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if (onoff)
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output_init_value &= ~IOEXP_IR_ON;
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else
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output_init_value |= IOEXP_IR_ON;
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return;
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}
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if (sc != NULL) {
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/* IR_ON is inverted */
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uint8_t reg = ioexp_gpio_pin_get(sc, IOEXP_IR_ON);
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if (onoff && reg) {
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ioexp_gpio_pin_write(sc, IOEXP_IR_ON, GPIO_PIN_LOW,
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true);
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} else if (!onoff && !reg) {
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ioexp_gpio_pin_write(sc, IOEXP_IR_ON, GPIO_PIN_HIGH,
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true);
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}
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}
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}
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/*
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* Enable or disable the mic bias
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*/
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void
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ioexp_set_mic_bias(int onoff)
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{
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struct ioexp_softc *sc = device_lookup_private(&ioexp_cd, 0);
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if (sc == NULL || !sc->sc_inited) {
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#ifdef DEBUG
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aprint_error("ioexp: %s: not attached or not inited\n",
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__func__);
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#endif
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if (onoff)
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output_init_value |= IOEXP_MIC_BIAS;
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else
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output_init_value &= ~IOEXP_MIC_BIAS;
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return;
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}
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if (sc != NULL) {
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uint8_t reg = ioexp_gpio_pin_get(sc, IOEXP_MIC_BIAS);
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if (onoff && !reg) {
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ioexp_gpio_pin_write(sc, IOEXP_MIC_BIAS, GPIO_PIN_HIGH,
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false);
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} else if (!onoff && reg) {
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ioexp_gpio_pin_write(sc, IOEXP_MIC_BIAS, GPIO_PIN_LOW,
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false);
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}
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}
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}
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/*
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* Turn on pullup resistor while not reading the remote control.
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*/
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void
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ioexp_akin_pullup(int onoff)
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{
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struct ioexp_softc *sc = device_lookup_private(&ioexp_cd, 0);
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if (sc == NULL || !sc->sc_inited) {
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#ifdef DEBUG
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aprint_error("ioexp: %s: not attached or not inited\n",
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__func__);
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#endif
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if (onoff)
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output_init_value |= IOEXP_AKIN_PULLUP;
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else
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output_init_value &= ~IOEXP_AKIN_PULLUP;
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return;
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}
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if (sc != NULL) {
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uint8_t reg = ioexp_gpio_pin_get(sc, IOEXP_AKIN_PULLUP);
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if (onoff && !reg) {
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ioexp_gpio_pin_write(sc, IOEXP_AKIN_PULLUP,
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GPIO_PIN_HIGH, true);
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} else if (!onoff && reg) {
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ioexp_gpio_pin_write(sc, IOEXP_AKIN_PULLUP,
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GPIO_PIN_LOW, true);
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}
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}
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}
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