146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/* $NetBSD: lm_i2c.c,v 1.5 2018/06/16 21:22:13 thorpej Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2000 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Bill Squier.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: lm_i2c.c,v 1.5 2018/06/16 21:22:13 thorpej Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/device.h>
|
|
#include <sys/conf.h>
|
|
|
|
#include <dev/i2c/i2cvar.h>
|
|
|
|
#include <dev/sysmon/sysmonvar.h>
|
|
|
|
#include <dev/ic/nslm7xvar.h>
|
|
|
|
int lm_i2c_match(device_t, cfdata_t, void *);
|
|
void lm_i2c_attach(device_t, device_t, void *);
|
|
int lm_i2c_detach(device_t, int);
|
|
|
|
uint8_t lm_i2c_readreg(struct lm_softc *, int);
|
|
void lm_i2c_writereg(struct lm_softc *, int, uint8_t);
|
|
|
|
struct lm_i2c_softc {
|
|
struct lm_softc sc_lmsc;
|
|
i2c_tag_t sc_tag;
|
|
i2c_addr_t sc_addr;
|
|
};
|
|
|
|
CFATTACH_DECL_NEW(lm_iic, sizeof(struct lm_i2c_softc),
|
|
lm_i2c_match, lm_i2c_attach, lm_i2c_detach, NULL);
|
|
|
|
int
|
|
lm_i2c_match(device_t parent, cfdata_t match, void *aux)
|
|
{
|
|
struct i2c_attach_args *ia = aux;
|
|
int rv = 0;
|
|
struct lm_i2c_softc sc;
|
|
|
|
/* Must supply an address */
|
|
if (ia->ia_addr < 1)
|
|
return 0;
|
|
|
|
/* XXXJRT filter addresses //at all// please? */
|
|
|
|
/* Bus independent probe */
|
|
sc.sc_lmsc.lm_writereg = lm_i2c_writereg;
|
|
sc.sc_lmsc.lm_readreg = lm_i2c_readreg;
|
|
sc.sc_tag = ia->ia_tag;
|
|
sc.sc_addr = ia->ia_addr;
|
|
rv = lm_match(&sc.sc_lmsc);
|
|
|
|
return rv ? I2C_MATCH_ADDRESS_AND_PROBE : 0;
|
|
}
|
|
|
|
|
|
void
|
|
lm_i2c_attach(device_t parent, device_t self, void *aux)
|
|
{
|
|
struct lm_i2c_softc *sc = device_private(self);
|
|
struct i2c_attach_args *ia = aux;
|
|
|
|
sc->sc_tag = ia->ia_tag;
|
|
sc->sc_addr = ia->ia_addr;
|
|
|
|
/* Bus-independent attachment */
|
|
sc->sc_lmsc.sc_dev = self;
|
|
sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
|
|
sc->sc_lmsc.lm_readreg = lm_i2c_readreg;
|
|
|
|
lm_attach(&sc->sc_lmsc);
|
|
}
|
|
|
|
int
|
|
lm_i2c_detach(device_t self, int flags)
|
|
{
|
|
struct lm_i2c_softc *sc = device_private(self);
|
|
|
|
lm_detach(&sc->sc_lmsc);
|
|
return 0;
|
|
}
|
|
|
|
uint8_t
|
|
lm_i2c_readreg(struct lm_softc *lmsc, int reg)
|
|
{
|
|
struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
|
|
uint8_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, uint8_t val)
|
|
{
|
|
struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
|
|
uint8_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);
|
|
}
|