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V4L/DVB (9397): fix some bugs at tda8261 

Fix bug obviously, some enhancements as well

* enable i2c_gate before doing any transaction
* read is one single message with 2 words
* reduce sleep from 100mS to 20mS

Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Manu Abraham 2007-09-24 13:27:06 -03:00 committed by Mauro Carvalho Chehab
parent de29eb8259
commit c7d85a2deb
1 changed files with 18 additions and 13 deletions
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31
drivers/media/dvb/frontends/tda8261.c
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@ -37,14 +37,15 @@ struct tda8261_state {
static int tda8261_read(struct tda8261_state *state, u8 *buf)
{
struct dvb_frontend *fe = state->fe;
const struct tda8261_config *config = state->config;
int err = 0;
struct i2c_msg msg[] = {
{ .addr = config->addr, .flags = 0, .buf = NULL, .len = 0 },
{ .addr = config->addr, .flags = I2C_M_RD,.buf = buf, .len = 1 }
};
struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD,.buf = buf, .len = 2 };
if ((err = i2c_transfer(state->i2c, msg, 2)) != 2)
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
printk("%s: read error, err=%d\n", __func__, err);
return err;
@ -52,12 +53,16 @@ static int tda8261_read(struct tda8261_state *state, u8 *buf)
static int tda8261_write(struct tda8261_state *state, u8 *buf)
{
struct dvb_frontend *fe = state->fe;
const struct tda8261_config *config = state->config;
int err = 0;
struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 };
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
printk("%s: read error, err=%d\n", __func__, err);
printk("%s: write error, err=%d\n", __func__, err);
return err;
}
@ -124,20 +129,21 @@ static int tda8261_set_state(struct dvb_frontend *fe,
*/
frequency = tstate->frequency;
N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
printk("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n",
__func__, config->step_size, div_tab[config->step_size], N, N);
buf[0] = (N >> 8) & 0xff;
buf[1] = N & 0xff;
buf[2] = (0x08 << 4) | ((ref_div[config->step_size] & 0x07) << 1);
buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1);
buf[3] = 0xc0;
/* Set params */
printk("%s: Frequency=%d, Sending[ %02x %02x %02x %02x ]\n",
__func__, frequency, buf[0], buf[1], buf[2], buf[3]);
if ((err = tda8261_write(state, buf)) < 0) {
printk("%s: I/O Error\n", __func__);
return err;
}
/* sleep for some time */
msleep(100);
printk("%s: Waiting to Phase LOCK\n", __func__);
msleep(20);
/* check status */
if ((err = tda8261_get_status(fe, &status)) < 0) {
printk("%s: I/O Error\n", __func__);
@ -145,7 +151,7 @@ static int tda8261_set_state(struct dvb_frontend *fe,
}
if (status == 1) {
printk("%s: Tuner Phase locked: status=%d\n", __func__, status);
state->frequency = frequency; /* cache last successful */
state->frequency = frequency; /* cache successful state */
} else {
printk("%s: No Phase lock: status=%d\n", __func__, status);
}
@ -203,7 +209,6 @@ struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe,
// __func__, fe->ops.tuner_ops.tuner_name);
printk("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__);
return fe;
exit: