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/* $OpenBSD: spdmem_i2c.c,v 1.2 2022/04/06 18:59:28 naddy Exp $ */
/* $NetBSD: spdmem.c,v 1.3 2007/09/20 23:09:59 xtraeme Exp $ */
/*
* Copyright (c) 2007 Jonathan Gray <jsg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Copyright (c) 2007 Nicolas Joly
* Copyright (c) 2007 Paul Goyette
* Copyright (c) 2007 Tobias Nygren
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
* ``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 THE FOUNDATION OR CONTRIBUTORS
* 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.
*/
/*
* Serial Presence Detect (SPD) memory identification
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/spdmemvar.h>
#include <dev/i2c/i2cvar.h>
struct spdmem_iic_softc {
struct spdmem_softc sc_base;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
};
int spdmem_iic_match(struct device *, void *, void *);
void spdmem_iic_attach(struct device *, struct device *, void *);
uint8_t spdmem_iic_read(struct spdmem_softc *, uint8_t);
const struct cfattach spdmem_iic_ca = {
sizeof(struct spdmem_iic_softc), spdmem_iic_match, spdmem_iic_attach
};
int
spdmem_iic_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
struct spdmem_iic_softc sc;
/* clever attachments like openfirmware informed macppc */
if (strcmp(ia->ia_name, "spd") == 0)
return (1);
/* dumb, need sanity checks */
if (strcmp(ia->ia_name, "eeprom") != 0)
return (0);
sc.sc_tag = ia->ia_tag;
sc.sc_addr = ia->ia_addr;
sc.sc_base.sc_read = spdmem_iic_read;
return spdmem_probe(&sc.sc_base);
}
void
spdmem_iic_attach(struct device *parent, struct device *self, void *aux)
{
struct spdmem_iic_softc *sc = (struct spdmem_iic_softc *)self;
struct i2c_attach_args *ia = aux;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
sc->sc_base.sc_read = spdmem_iic_read;
printf(":");
spdmem_attach_common(&sc->sc_base);
}
uint8_t
spdmem_iic_read(struct spdmem_softc *v, uint8_t reg)
{
struct spdmem_iic_softc *sc = (struct spdmem_iic_softc *)v;
uint8_t val = 0xff;
iic_acquire_bus(sc->sc_tag,0);
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
®, sizeof reg, &val, sizeof val, 0);
iic_release_bus(sc->sc_tag, 0);
return val;
}
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