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[media] ec100: improve I2C routines 

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antti Palosaari 2012-09-12 20:23:45 -03:00 committed by Mauro Carvalho Chehab
parent 20399b3b0e
commit 0d2d603124
1 changed files with 28 additions and 15 deletions
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43
drivers/media/dvb-frontends/ec100.c
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@ -33,24 +33,33 @@ struct ec100_state {
/* write single register */
static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val)
{
int ret;
u8 buf[2] = {reg, val};
struct i2c_msg msg = {
.addr = state->config.demod_address,
.flags = 0,
.len = 2,
.buf = buf};
struct i2c_msg msg[1] = {
{
.addr = state->config.demod_address,
.flags = 0,
.len = sizeof(buf),
.buf = buf,
}
};
if (i2c_transfer(state->i2c, &msg, 1) != 1) {
dev_warn(&state->i2c->dev, "%s: i2c wr failed reg=%02x\n",
KBUILD_MODNAME, reg);
return -EREMOTEIO;
ret = i2c_transfer(state->i2c, msg, 1);
if (ret == 1) {
ret = 0;
} else {
dev_warn(&state->i2c->dev, "%s: i2c wr failed=%d reg=%02x\n",
KBUILD_MODNAME, ret, reg);
ret = -EREMOTEIO;
}
return 0;
return ret;
}
/* read single register */
static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)
{
int ret;
struct i2c_msg msg[2] = {
{
.addr = state->config.demod_address,
@ -65,12 +74,16 @@ static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)
}
};
if (i2c_transfer(state->i2c, msg, 2) != 2) {
dev_warn(&state->i2c->dev, "%s: i2c rd failed reg=%02x\n",
KBUILD_MODNAME, reg);
return -EREMOTEIO;
ret = i2c_transfer(state->i2c, msg, 2);
if (ret == 2) {
ret = 0;
} else {
dev_warn(&state->i2c->dev, "%s: i2c rd failed=%d reg=%02x\n",
KBUILD_MODNAME, ret, reg);
ret = -EREMOTEIO;
}
return 0;
return ret;
}
static int ec100_set_frontend(struct dvb_frontend *fe)