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[media] r820t: proper lock and set the I2C gate

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As this tuner can be used by analog and digital parts of the
driver, be sure that all ops that access the hardware will
be be properly locked.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: Antti Palosaari <crope@iki.fi>
This commit is contained in:
Mauro Carvalho Chehab 2013-04-07 19:32:55 -03:00
parent 9e30edd890
commit 7a5ef30dc3
1 changed files with 33 additions and 17 deletions
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50
drivers/media/tuners/r820t.c
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@ -1193,8 +1193,6 @@ static int generic_set_freq(struct dvb_frontend *fe,
tuner_dbg("should set frequency to %d kHz, bw %d MHz\n",
freq / 1000, bw);
mutex_lock(&priv->lock);
if ((type == V4L2_TUNER_ANALOG_TV) && (std == V4L2_STD_SECAM_LC))
lo_freq = freq - priv->int_freq;
else
@ -1218,7 +1216,6 @@ static int generic_set_freq(struct dvb_frontend *fe,
rc = r820t_sysfreq_sel(priv, freq, type, std, delsys);
err:
mutex_unlock(&priv->lock);
if (rc < 0)
tuner_dbg("%s: failed=%d\n", __func__, rc);
@ -1335,6 +1332,8 @@ static int r820t_xtal_check(struct r820t_priv *priv)
/*
* r820t frontend operations and tuner attach code
*
* All driver locks and i2c control are only in this part of the code
*/
static int r820t_init(struct dvb_frontend *fe)
@ -1345,11 +1344,10 @@ static int r820t_init(struct dvb_frontend *fe)
tuner_dbg("%s:\n", __func__);
mutex_lock(&priv->lock);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
mutex_lock(&priv->lock);
if ((priv->cfg->rafael_chip == CHIP_R820T) ||
(priv->cfg->rafael_chip == CHIP_R828S) ||
(priv->cfg->rafael_chip == CHIP_R820C)) {
@ -1369,17 +1367,13 @@ static int r820t_init(struct dvb_frontend *fe)
rc = r820t_write(priv, 0x05,
r820t_init_array, sizeof(r820t_init_array));
mutex_unlock(&priv->lock);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
return rc;
err:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
mutex_unlock(&priv->lock);
tuner_dbg("%s: failed=%d\n", __func__, rc);
if (rc < 0)
tuner_dbg("%s: failed=%d\n", __func__, rc);
return rc;
}
@ -1390,15 +1384,15 @@ static int r820t_sleep(struct dvb_frontend *fe)
tuner_dbg("%s:\n", __func__);
mutex_lock(&priv->lock);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
mutex_lock(&priv->lock);
rc = r820t_standby(priv);
mutex_unlock(&priv->lock);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
mutex_unlock(&priv->lock);
tuner_dbg("%s: failed=%d\n", __func__, rc);
return rc;
@ -1409,6 +1403,7 @@ static int r820t_set_analog_freq(struct dvb_frontend *fe,
{
struct r820t_priv *priv = fe->tuner_priv;
unsigned bw;
int rc;
tuner_dbg("%s called\n", __func__);
@ -1421,8 +1416,18 @@ static int r820t_set_analog_freq(struct dvb_frontend *fe,
else
bw = 8;
return generic_set_freq(fe, 62500l * p->frequency, bw,
V4L2_TUNER_ANALOG_TV, p->std, SYS_UNDEFINED);
mutex_lock(&priv->lock);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
rc = generic_set_freq(fe, 62500l * p->frequency, bw,
V4L2_TUNER_ANALOG_TV, p->std, SYS_UNDEFINED);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
mutex_unlock(&priv->lock);
return rc;
}
static int r820t_set_params(struct dvb_frontend *fe)
@ -1435,6 +1440,7 @@ static int r820t_set_params(struct dvb_frontend *fe)
tuner_dbg("%s: delivery_system=%d frequency=%d bandwidth_hz=%d\n",
__func__, c->delivery_system, c->frequency, c->bandwidth_hz);
mutex_lock(&priv->lock);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
@ -1447,6 +1453,7 @@ static int r820t_set_params(struct dvb_frontend *fe)
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
mutex_unlock(&priv->lock);
if (rc)
tuner_dbg("%s: failed=%d\n", __func__, rc);
@ -1458,10 +1465,14 @@ static int r820t_signal(struct dvb_frontend *fe, u16 *strength)
struct r820t_priv *priv = fe->tuner_priv;
int rc = 0;
mutex_lock(&priv->lock);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
if (priv->has_lock) {
rc = r820t_read_gain(priv);
if (rc < 0)
return rc;
goto err;
/* A higher gain at LNA means a lower signal strength */
*strength = (45 - rc) << 4 | 0xff;
@ -1469,6 +1480,11 @@ static int r820t_signal(struct dvb_frontend *fe, u16 *strength)
*strength = 0;
}
err:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
mutex_unlock(&priv->lock);
tuner_dbg("%s: %s, gain=%d strength=%d\n",
__func__,
priv->has_lock ? "PLL locked" : "no signal",