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V4L/DVB (6138): tea5761: add get_rf_strength and improve status reading efficiency 

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Michael Krufky 2007-08-31 16:39:57 -03:00 committed by Mauro Carvalho Chehab
parent 735f0b9af1
commit fd443f7444
1 changed files with 41 additions and 23 deletions
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64
drivers/media/video/tea5761.c
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@ -177,49 +177,66 @@ static int set_radio_freq(struct dvb_frontend *fe,
return 0;
}
static int tea5761_signal(struct dvb_frontend *fe)
static int tea5761_read_status(struct dvb_frontend *fe, char *buffer)
{
unsigned char buffer[16];
int rc;
struct tea5761_priv *priv = fe->tuner_priv;
int rc;
memset(buffer, 0, sizeof(buffer));
if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16)))
tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
memset(buffer, 0, 16);
if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16))) {
tuner_warn("i2c i/o error: rc == %d (should be 16)\n", rc);
return -EREMOTEIO;
}
return ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));
return 0;
}
static int tea5761_stereo(struct dvb_frontend *fe)
static inline int tea5761_signal(struct dvb_frontend *fe, const char *buffer)
{
unsigned char buffer[16];
int rc;
struct tea5761_priv *priv = fe->tuner_priv;
memset(buffer, 0, sizeof(buffer));
if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16)))
tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
int signal = ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));
rc = buffer[9] & TEA5761_TUNCHECK_STEREO;
tuner_dbg("Signal strength: %d\n", signal);
tuner_dbg("TEA5761 radio ST GET = %02x\n", rc);
return signal;
}
return (rc ? V4L2_TUNER_SUB_STEREO : 0);
static inline int tea5761_stereo(struct dvb_frontend *fe, const char *buffer)
{
struct tea5761_priv *priv = fe->tuner_priv;
int stereo = buffer[9] & TEA5761_TUNCHECK_STEREO;
tuner_dbg("Radio ST GET = %02x\n", stereo);
return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
}
static int tea5761_get_status(struct dvb_frontend *fe, u32 *status)
{
struct tea5761_priv *priv = fe->tuner_priv;
int signal = tea5761_signal(fe);
unsigned char buffer[16];
*status = 0;
if (signal)
*status = TUNER_STATUS_LOCKED;
if (tea5761_stereo(fe))
*status |= TUNER_STATUS_STEREO;
if (0 == tea5761_read_status(fe, buffer)) {
if (tea5761_signal(fe, buffer))
*status = TUNER_STATUS_LOCKED;
if (tea5761_stereo(fe, buffer))
*status |= TUNER_STATUS_STEREO;
}
tuner_dbg("tea5761: Signal strength: %d\n", signal);
return 0;
}
static int tea5761_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
{
unsigned char buffer[16];
*strength = 0;
if (0 == tea5761_read_status(fe, buffer))
*strength = tea5761_signal(fe, buffer);
return 0;
}
@ -266,6 +283,7 @@ static struct dvb_tuner_ops tea5761_tuner_ops = {
.release = tea5761_release,
.get_frequency = tea5761_get_frequency,
.get_status = tea5761_get_status,
.get_rf_strength = tea5761_get_rf_strength,
};
struct dvb_frontend *tea5761_attach(struct dvb_frontend *fe,