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lock/unlock I2C bus around transfers as required by API

This commit is contained in:
jmcneill 2018-10-17 16:56:40 +00:00
parent 78c4b947e8
commit f689fd3cfe
1 changed files with 16 additions and 4 deletions
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20
sys/dev/i2c/tcakp.c
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@ -1,4 +1,4 @@
/* $NetBSD: tcakp.c,v 1.9 2018/06/26 06:03:57 thorpej Exp $ */
/* $NetBSD: tcakp.c,v 1.10 2018/10/17 16:56:40 jmcneill Exp $ */
/*-
* Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
@ -29,7 +29,7 @@
#include "opt_fdt.h"
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tcakp.c,v 1.9 2018/06/26 06:03:57 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: tcakp.c,v 1.10 2018/10/17 16:56:40 jmcneill Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -364,14 +364,26 @@ tcakp_attach(device_t parent, device_t self, void *aux)
static int
tcakp_read(struct tcakp_softc *sc, uint8_t reg, uint8_t *val)
{
return iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr,
int error;
iic_acquire_bus(sc->sc_i2c, I2C_F_POLL);
error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, sc->sc_addr,
&reg, 1, val, 1, I2C_F_POLL);
iic_release_bus(sc->sc_i2c, I2C_F_POLL);
return error;
}
static int
tcakp_write(struct tcakp_softc *sc, uint8_t reg, uint8_t val)
{
uint8_t buf[2] = { reg, val };
return iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
int error;
iic_acquire_bus(sc->sc_i2c, I2C_F_POLL);
error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
NULL, 0, buf, 2, I2C_F_POLL);
iic_release_bus(sc->sc_i2c, I2C_F_POLL);
return error;
}