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/* $OpenBSD: i2c.c,v 1.19 2022/04/06 18:59:28 naddy Exp $ */
/* $NetBSD: i2c.c,v 1.1 2003/09/30 00:35:31 thorpej Exp $ */
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/event.h>
#define _I2C_PRIVATE
#include <dev/i2c/i2cvar.h>
#define IICCF_ADDR 0
#define IICCF_SIZE 1
struct iic_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
};
int iic_match(struct device *, void *, void *);
void iic_attach(struct device *, struct device *, void *);
int iic_search(struct device *, void *, void *);
const struct cfattach iic_ca = {
sizeof (struct iic_softc),
iic_match,
iic_attach
};
struct cfdriver iic_cd = {
NULL, "iic", DV_DULL, CD_SKIPHIBERNATE
};
int
iicbus_print(void *aux, const char *pnp)
{
struct i2cbus_attach_args *iba = aux;
if (pnp != NULL)
printf("%s at %s", iba->iba_name, pnp);
return (UNCONF);
}
int
iic_print(void *aux, const char *pnp)
{
struct i2c_attach_args *ia = aux;
if (pnp != NULL)
printf("\"%s\" at %s", ia->ia_name, pnp);
printf(" addr 0x%x", ia->ia_addr);
return (UNCONF);
}
int
iic_search(struct device *parent, void *arg, void *aux)
{
struct iic_softc *sc = (void *) parent;
struct cfdata *cf = arg;
struct i2c_attach_args ia;
if (cf->cf_loc[IICCF_ADDR] != -1) {
memset(&ia, 0, sizeof(ia));
ia.ia_tag = sc->sc_tag;
ia.ia_addr = cf->cf_loc[IICCF_ADDR];
ia.ia_size = cf->cf_loc[IICCF_SIZE];
ia.ia_name = "unknown";
if (cf->cf_attach->ca_match(parent, cf, &ia) > 0)
config_attach(parent, cf, &ia, iic_print);
}
return (0);
}
int
iic_match(struct device *parent, void *arg, void *aux)
{
struct cfdata *cf = arg;
struct i2cbus_attach_args *iba = aux;
/* Just make sure we're looking for i2c. */
return (strcmp(iba->iba_name, cf->cf_driver->cd_name) == 0);
}
void
iic_attach(struct device *parent, struct device *self, void *aux)
{
struct iic_softc *sc = (void *) self;
struct i2cbus_attach_args *iba = aux;
sc->sc_tag = iba->iba_tag;
printf("\n");
/*
* Attach all i2c devices described in the kernel
* configuration file.
*/
config_search(iic_search, self, NULL);
/*
* Scan for known device signatures.
*/
if (iba->iba_bus_scan)
(iba->iba_bus_scan)(self, aux, iba->iba_bus_scan_arg);
else
iic_scan(self, aux);
}
int
iic_is_compatible(const struct i2c_attach_args *ia, const char *name)
{
const char *end, *entry;
if (ia->ia_namelen > 0) {
/* ia_name points to a concatenation of strings. */
entry = ia->ia_name;
end = entry + ia->ia_namelen;
while (entry < end) {
if (strcmp(entry, name) == 0)
return (1);
entry += strlen(entry) + 1;
}
} else {
/* ia_name points to a string. */
if (strcmp(ia->ia_name, name) == 0)
return (1);
}
return (0);
}
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