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/* $OpenBSD: lm78_i2c.c,v 1.3 2011/07/26 18:43:36 deraadt Exp $ */
/*
* Copyright (c) 2005 Mark Kettenis
*
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/sensors.h>
#include <machine/bus.h>
#include <dev/i2c/i2cvar.h>
#include <dev/ic/lm78var.h>
struct lm_i2c_softc {
struct lm_softc sc_lmsc;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
};
int lm_i2c_match(struct device *, void *, void *);
void lm_i2c_attach(struct device *, struct device *, void *);
u_int8_t lm_i2c_readreg(struct lm_softc *, int);
void lm_i2c_writereg(struct lm_softc *, int, int);
struct cfattach lm_i2c_ca = {
sizeof(struct lm_i2c_softc), lm_i2c_match, lm_i2c_attach
};
int
lm_i2c_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "as99127f") == 0 ||
strcmp(ia->ia_name, "w83627dhg") == 0 ||
strcmp(ia->ia_name, "w83627hf") == 0 ||
strcmp(ia->ia_name, "w83781d") == 0 ||
strcmp(ia->ia_name, "w83782d") == 0 ||
strcmp(ia->ia_name, "w83783s") == 0 ||
strcmp(ia->ia_name, "w83791d") == 0 ||
strcmp(ia->ia_name, "w83792d") == 0) {
return (1);
}
/*
* XXX This chip doesn't have any real sensors, but we match
* it for now, just to knock out its satellites.
*/
if (strcmp(ia->ia_name, "w83791sd") == 0) {
return (1);
}
return (0);
}
void
lm_i2c_attach(struct device *parent, struct device *self, void *aux)
{
struct lm_i2c_softc *sc = (struct lm_i2c_softc *)self;
struct i2c_attach_args *ia = aux;
u_int8_t cmd, data;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
/* Bus-independent attachment. */
sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
sc->sc_lmsc.lm_readreg = lm_i2c_readreg;
lm_attach(&sc->sc_lmsc);
/* Remember we attached to iic(4). */
sc->sc_lmsc.sbusaddr = ia->ia_addr;
iic_acquire_bus(sc->sc_tag, 0);
cmd = 0x4a;
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
iic_release_bus(sc->sc_tag, 0);
/* Make the bus scan ignore the satellites. */
iic_ignore_addr(0x48 + (data & 0x7));
iic_ignore_addr(0x48 + ((data >> 4) & 0x7));
}
u_int8_t
lm_i2c_readreg(struct lm_softc *lmsc, int reg)
{
struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
u_int8_t cmd, data;
iic_acquire_bus(sc->sc_tag, 0);
cmd = reg;
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
iic_release_bus(sc->sc_tag, 0);
return data;
}
void
lm_i2c_writereg(struct lm_softc *lmsc, int reg, int val)
{
struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
u_int8_t cmd, data;
iic_acquire_bus(sc->sc_tag, 0);
cmd = reg;
data = val;
iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
iic_release_bus(sc->sc_tag, 0);
}
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