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- No need to use I2C_F_POLL here. 

- Don't write to the device if iic_acquire_bus() fails.
This commit is contained in:
thorpej 2019-12-23 18:57:30 +00:00
parent 2da170dcd3
commit 9889c0406f
1 changed files with 26 additions and 20 deletions
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46
sys/dev/i2c/mt2131.c
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@ -1,4 +1,4 @@
/* $NetBSD: mt2131.c,v 1.6 2017/06/01 02:45:10 chs Exp $ */
/* $NetBSD: mt2131.c,v 1.7 2019/12/23 18:57:30 thorpej Exp $ */
/*
* Copyright (c) 2008, 2011 Jonathan A. Kollasch
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mt2131.c,v 1.6 2017/06/01 02:45:10 chs Exp $");
__KERNEL_RCSID(0, "$NetBSD: mt2131.c,v 1.7 2019/12/23 18:57:30 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -85,9 +85,12 @@ mt2131_open(device_t parent, i2c_tag_t t, i2c_addr_t a)
cmd = reg = 0;
/* get id reg */
iic_acquire_bus(t, I2C_F_POLL);
ret = iic_exec(t, I2C_OP_READ_WITH_STOP, a, &cmd, 1, &reg, 1, I2C_F_POLL);
iic_release_bus(t, I2C_F_POLL);
ret = iic_acquire_bus(t, 0);
if (ret == 0) {
ret = iic_exec(t, I2C_OP_READ_WITH_STOP, a, &cmd, 1, &reg, 1,
0);
iic_release_bus(t, 0);
}
if (ret) {
device_printf(parent, "%s(): read fail\n", __func__);
@ -153,9 +156,12 @@ mt2131_tune_dtv(struct mt2131_softc *sc, const struct dvb_frontend_parameters *p
b[5] = (d2 & 0x001f);
b[6] = r2;
iic_acquire_bus(sc->tag, I2C_F_POLL);
rv = iic_exec(sc->tag, I2C_OP_WRITE_WITH_STOP, sc->addr, b, 7, NULL, 0, I2C_F_POLL);
iic_release_bus(sc->tag, I2C_F_POLL);
rv = iic_acquire_bus(sc->tag, 0);
if (rv == 0) {
rv = iic_exec(sc->tag, I2C_OP_WRITE_WITH_STOP, sc->addr, b, 7,
NULL, 0, 0);
iic_release_bus(sc->tag, 0);
}
regval = (fr - 27501) / 55000;
@ -191,27 +197,27 @@ mt2131_init(struct mt2131_softc *sc)
{
int ret;
ret = iic_acquire_bus(sc->tag, I2C_F_POLL);
ret = iic_acquire_bus(sc->tag, 0);
if (ret)
return -1;
ret = iic_exec(sc->tag, I2C_OP_WRITE_WITH_STOP, sc->addr,
mt2131_initstring, sizeof(mt2131_initstring), NULL, 0, I2C_F_POLL);
mt2131_initstring, sizeof(mt2131_initstring), NULL, 0, 0);
iic_release_bus(sc->tag, 0);
if (ret)
return -1;
iic_release_bus(sc->tag, I2C_F_POLL);
ret = mt2131_write(sc, UPC_1, 0x09);
ret = mt2131_write(sc, MISC_2, 0x47);
ret = mt2131_write(sc, PWR, 0xf2);
ret = mt2131_write(sc, UPC_1, 0x01);
ret = iic_acquire_bus(sc->tag, I2C_F_POLL);
ret = iic_acquire_bus(sc->tag, 0);
if (ret)
return -1;
ret = iic_exec(sc->tag, I2C_OP_WRITE_WITH_STOP, sc->addr,
mt2131_agcinitstring, sizeof(mt2131_agcinitstring),
NULL, 0, I2C_F_POLL);
iic_release_bus(sc->tag, I2C_F_POLL);
NULL, 0, 0);
iic_release_bus(sc->tag, 0);
if (ret)
return -1;
@ -223,13 +229,13 @@ mt2131_read(struct mt2131_softc *sc, uint8_t r, uint8_t *v)
{
int ret;
ret = iic_acquire_bus(sc->tag, I2C_F_POLL);
ret = iic_acquire_bus(sc->tag, 0);
if (ret)
return ret;
ret = iic_exec(sc->tag, I2C_OP_READ_WITH_STOP, sc->addr,
&r, 1, v, 1, I2C_F_POLL);
&r, 1, v, 1, 0);
iic_release_bus(sc->tag, I2C_F_POLL);
iic_release_bus(sc->tag, 0);
return ret;
}
@ -240,14 +246,14 @@ mt2131_write(struct mt2131_softc *sc, uint8_t a, uint8_t v)
int ret;
uint8_t b[] = { a, v };
ret = iic_acquire_bus(sc->tag, I2C_F_POLL);
ret = iic_acquire_bus(sc->tag, 0);
if (ret)
return ret;
ret = iic_exec(sc->tag, I2C_OP_READ_WITH_STOP, sc->addr,
b, sizeof(b), NULL, 0, I2C_F_POLL);
b, sizeof(b), NULL, 0, 0);
iic_release_bus(sc->tag, I2C_F_POLL);
iic_release_bus(sc->tag, 0);
return ret;
}