151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/* $NetBSD: lm_i2c.c,v 1.7 2021/06/13 09:48:44 mlelstv Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Bill Squier.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: lm_i2c.c,v 1.7 2021/06/13 09:48:44 mlelstv Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/kmem.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/sysmon/sysmonvar.h>
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#include <dev/ic/nslm7xvar.h>
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int lm_i2c_match(device_t, cfdata_t, void *);
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void lm_i2c_attach(device_t, device_t, void *);
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int lm_i2c_detach(device_t, int);
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uint8_t lm_i2c_readreg(struct lm_softc *, int);
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void lm_i2c_writereg(struct lm_softc *, int, uint8_t);
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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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CFATTACH_DECL_NEW(lm_iic, sizeof(struct lm_i2c_softc),
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lm_i2c_match, lm_i2c_attach, lm_i2c_detach, NULL);
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int
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lm_i2c_match(device_t parent, cfdata_t match, void *aux)
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{
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struct i2c_attach_args *ia = aux;
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int rv = 0;
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struct lm_i2c_softc *sc;
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/* Must supply an address */
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if (ia->ia_addr < 1)
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return 0;
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/* XXXJRT filter addresses //at all// please? */
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/* Bus independent probe */
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sc = kmem_zalloc(sizeof(*sc), KM_SLEEP);
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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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sc->sc_tag = ia->ia_tag;
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sc->sc_addr = ia->ia_addr;
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rv = lm_match(&sc->sc_lmsc);
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kmem_free(sc, sizeof(*sc));
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return rv ? I2C_MATCH_ADDRESS_AND_PROBE : 0;
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}
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void
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lm_i2c_attach(device_t parent, device_t self, void *aux)
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{
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struct lm_i2c_softc *sc = device_private(self);
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struct i2c_attach_args *ia = aux;
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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.sc_dev = self;
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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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}
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int
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lm_i2c_detach(device_t self, int flags)
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{
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struct lm_i2c_softc *sc = device_private(self);
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lm_detach(&sc->sc_lmsc);
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return 0;
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}
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uint8_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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uint8_t cmd, data;
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if (iic_acquire_bus(sc->sc_tag, 0))
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return 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, uint8_t val)
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{
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struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
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uint8_t cmd, data;
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if (iic_acquire_bus(sc->sc_tag, 0))
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return;
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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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