129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/* $OpenBSD: lm78_i2c.c,v 1.5 2022/04/06 18:59:28 naddy Exp $ */
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/*
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* Copyright (c) 2005 Mark Kettenis
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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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/sensors.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/ic/lm78var.h>
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struct lm_i2c_softc {
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struct lm_softc sc_lmsc;
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i2c_tag_t sc_tag;
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i2c_addr_t sc_addr;
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};
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int lm_i2c_match(struct device *, void *, void *);
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void lm_i2c_attach(struct device *, struct device *, void *);
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u_int8_t lm_i2c_readreg(struct lm_softc *, int);
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void lm_i2c_writereg(struct lm_softc *, int, int);
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const struct cfattach lm_i2c_ca = {
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sizeof(struct lm_i2c_softc), lm_i2c_match, lm_i2c_attach
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};
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int
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lm_i2c_match(struct device *parent, void *match, void *aux)
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{
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struct i2c_attach_args *ia = aux;
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if (strcmp(ia->ia_name, "as99127f") == 0 ||
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strcmp(ia->ia_name, "w83627dhg") == 0 ||
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strcmp(ia->ia_name, "w83627hf") == 0 ||
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strcmp(ia->ia_name, "w83781d") == 0 ||
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strcmp(ia->ia_name, "w83782d") == 0 ||
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strcmp(ia->ia_name, "w83783s") == 0 ||
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strcmp(ia->ia_name, "w83791d") == 0 ||
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strcmp(ia->ia_name, "w83792d") == 0) {
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return (1);
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}
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/*
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* XXX This chip doesn't have any real sensors, but we match
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* it for now, just to knock out its satellites.
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*/
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if (strcmp(ia->ia_name, "w83791sd") == 0) {
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return (1);
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}
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return (0);
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}
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void
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lm_i2c_attach(struct device *parent, struct device *self, void *aux)
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{
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struct lm_i2c_softc *sc = (struct lm_i2c_softc *)self;
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struct i2c_attach_args *ia = aux;
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u_int8_t cmd, data;
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sc->sc_tag = ia->ia_tag;
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sc->sc_addr = ia->ia_addr;
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/* Bus-independent attachment. */
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sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
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sc->sc_lmsc.lm_readreg = lm_i2c_readreg;
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lm_attach(&sc->sc_lmsc);
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/* Remember we attached to iic(4). */
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sc->sc_lmsc.sbusaddr = ia->ia_addr;
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iic_acquire_bus(sc->sc_tag, 0);
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cmd = 0x4a;
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iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
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sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
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iic_release_bus(sc->sc_tag, 0);
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/* Make the bus scan ignore the satellites. */
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iic_ignore_addr(0x48 + (data & 0x7));
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iic_ignore_addr(0x48 + ((data >> 4) & 0x7));
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}
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u_int8_t
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lm_i2c_readreg(struct lm_softc *lmsc, int reg)
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{
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struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
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u_int8_t cmd, data;
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iic_acquire_bus(sc->sc_tag, 0);
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cmd = reg;
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iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
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sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
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iic_release_bus(sc->sc_tag, 0);
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return data;
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}
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void
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lm_i2c_writereg(struct lm_softc *lmsc, int reg, int val)
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{
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struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
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u_int8_t cmd, data;
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iic_acquire_bus(sc->sc_tag, 0);
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cmd = reg;
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data = val;
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iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
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sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);
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iic_release_bus(sc->sc_tag, 0);
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}
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