1537078d8f
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
272 lines
5.9 KiB
C
272 lines
5.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1998, 2001 Nicolas Souchu, Marc Bouget
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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 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* I2C Bit-Banging over parallel port
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*
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* See the Official Philips interface description in lpbb(4)
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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/lock.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <dev/ppbus/ppbconf.h>
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#include "ppbus_if.h"
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#include <dev/ppbus/ppbio.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include "iicbb_if.h"
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static int lpbb_detect(device_t dev);
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static void
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lpbb_identify(driver_t *driver, device_t parent)
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{
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device_t dev;
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dev = device_find_child(parent, "lpbb", -1);
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if (!dev)
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BUS_ADD_CHILD(parent, 0, "lpbb", -1);
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}
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static int
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lpbb_probe(device_t dev)
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{
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/* Perhaps call this during identify instead? */
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if (!lpbb_detect(dev))
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return (ENXIO);
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device_set_desc(dev, "Parallel I2C bit-banging interface");
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return (0);
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}
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static int
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lpbb_attach(device_t dev)
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{
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device_t bitbang;
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/* add generic bit-banging code */
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bitbang = device_add_child(dev, "iicbb", -1);
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device_probe_and_attach(bitbang);
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return (0);
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}
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static int
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lpbb_callback(device_t dev, int index, caddr_t data)
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{
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device_t ppbus = device_get_parent(dev);
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int error = 0;
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int how;
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switch (index) {
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case IIC_REQUEST_BUS:
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/* request the ppbus */
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how = *(int *)data;
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ppb_lock(ppbus);
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error = ppb_request_bus(ppbus, dev, how);
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ppb_unlock(ppbus);
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break;
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case IIC_RELEASE_BUS:
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/* release the ppbus */
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ppb_lock(ppbus);
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error = ppb_release_bus(ppbus, dev);
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ppb_unlock(ppbus);
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break;
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default:
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error = EINVAL;
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}
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return (error);
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}
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#define SDA_out 0x80
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#define SCL_out 0x08
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#define SDA_in 0x80
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#define SCL_in 0x08
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#define ALIM 0x20
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#define I2CKEY 0x50
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/* Reset bus by setting SDA first and then SCL. */
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static void
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lpbb_reset_bus(device_t dev)
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{
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device_t ppbus = device_get_parent(dev);
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ppb_assert_locked(ppbus);
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ppb_wdtr(ppbus, (u_char)~SDA_out);
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ppb_wctr(ppbus, (u_char)(ppb_rctr(ppbus) | SCL_out));
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}
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static int
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lpbb_getscl(device_t dev)
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{
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device_t ppbus = device_get_parent(dev);
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int rval;
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ppb_lock(ppbus);
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rval = ((ppb_rstr(ppbus) & SCL_in) == SCL_in);
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ppb_unlock(ppbus);
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return (rval);
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}
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static int
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lpbb_getsda(device_t dev)
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{
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device_t ppbus = device_get_parent(dev);
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int rval;
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ppb_lock(ppbus);
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rval = ((ppb_rstr(ppbus) & SDA_in) == SDA_in);
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ppb_unlock(ppbus);
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return (rval);
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}
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static void
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lpbb_setsda(device_t dev, int val)
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{
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device_t ppbus = device_get_parent(dev);
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ppb_lock(ppbus);
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if (val == 0)
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ppb_wdtr(ppbus, (u_char)SDA_out);
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else
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ppb_wdtr(ppbus, (u_char)~SDA_out);
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ppb_unlock(ppbus);
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}
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static void
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lpbb_setscl(device_t dev, int val)
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{
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device_t ppbus = device_get_parent(dev);
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ppb_lock(ppbus);
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if (val == 0)
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ppb_wctr(ppbus, (u_char)(ppb_rctr(ppbus) & ~SCL_out));
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else
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ppb_wctr(ppbus, (u_char)(ppb_rctr(ppbus) | SCL_out));
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ppb_unlock(ppbus);
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}
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static int
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lpbb_detect(device_t dev)
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{
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device_t ppbus = device_get_parent(dev);
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ppb_lock(ppbus);
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if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) {
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ppb_unlock(ppbus);
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device_printf(dev, "can't allocate ppbus\n");
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return (0);
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}
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lpbb_reset_bus(dev);
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if ((ppb_rstr(ppbus) & I2CKEY) ||
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((ppb_rstr(ppbus) & ALIM) != ALIM)) {
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ppb_release_bus(ppbus, dev);
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ppb_unlock(ppbus);
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return (0);
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}
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ppb_release_bus(ppbus, dev);
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ppb_unlock(ppbus);
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return (1);
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}
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static int
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lpbb_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr)
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{
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device_t ppbus = device_get_parent(dev);
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ppb_lock(ppbus);
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if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) {
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ppb_unlock(ppbus);
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device_printf(dev, "can't allocate ppbus\n");
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return (0);
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}
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lpbb_reset_bus(dev);
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ppb_release_bus(ppbus, dev);
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ppb_unlock(ppbus);
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return (IIC_ENOADDR);
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}
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static devclass_t lpbb_devclass;
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static device_method_t lpbb_methods[] = {
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/* device interface */
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DEVMETHOD(device_identify, lpbb_identify),
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DEVMETHOD(device_probe, lpbb_probe),
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DEVMETHOD(device_attach, lpbb_attach),
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/* iicbb interface */
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DEVMETHOD(iicbb_callback, lpbb_callback),
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DEVMETHOD(iicbb_setsda, lpbb_setsda),
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DEVMETHOD(iicbb_setscl, lpbb_setscl),
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DEVMETHOD(iicbb_getsda, lpbb_getsda),
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DEVMETHOD(iicbb_getscl, lpbb_getscl),
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DEVMETHOD(iicbb_reset, lpbb_reset),
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DEVMETHOD_END
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};
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static driver_t lpbb_driver = {
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"lpbb",
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lpbb_methods,
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1,
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};
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DRIVER_MODULE(lpbb, ppbus, lpbb_driver, lpbb_devclass, 0, 0);
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DRIVER_MODULE(iicbb, lpbb, iicbb_driver, iicbb_devclass, 0, 0);
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MODULE_DEPEND(lpbb, ppbus, 1, 1, 1);
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MODULE_DEPEND(lpbb, iicbb, IICBB_MINVER, IICBB_PREFVER, IICBB_MAXVER);
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MODULE_VERSION(lpbb, 1);
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