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[media] lgdt3306a: properly handle I/O errors

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Fixes the following smatch errors:

drivers/media/dvb-frontends/lgdt3306a.c: In function 'lgdt3306a_set_if':
drivers/media/dvb-frontends/lgdt3306a.c:695:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
  int ret;
      ^
drivers/media/dvb-frontends/lgdt3306a.c: In function 'lgdt3306a_monitor_vsb':
drivers/media/dvb-frontends/lgdt3306a.c:1033:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
  int ret;
      ^
drivers/media/dvb-frontends/lgdt3306a.c: In function 'lgdt3306a_check_oper_mode':
drivers/media/dvb-frontends/lgdt3306a.c:1082:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
  int ret;
      ^
drivers/media/dvb-frontends/lgdt3306a.c: In function 'lgdt3306a_check_lock_status':
drivers/media/dvb-frontends/lgdt3306a.c:1109:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
  int ret;
      ^
drivers/media/dvb-frontends/lgdt3306a.c: In function 'lgdt3306a_check_neverlock_status':
drivers/media/dvb-frontends/lgdt3306a.c:1185:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
  int ret;
      ^
drivers/media/dvb-frontends/lgdt3306a.c: In function 'lgdt3306a_pre_monitoring':
drivers/media/dvb-frontends/lgdt3306a.c:1199:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
  int ret;
      ^
drivers/media/dvb-frontends/lgdt3306a.c: In function 'lgdt3306a_get_packet_error':
drivers/media/dvb-frontends/lgdt3306a.c:1310:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
  int ret;
      ^

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2014-10-28 11:21:48 -02:00
parent a132fef816
commit ee0133eea0
1 changed files with 79 additions and 5 deletions
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84
drivers/media/dvb-frontends/lgdt3306a.c
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@ -734,7 +734,11 @@ static int lgdt3306a_set_if(struct lgdt3306a_state *state,
break;
}
ret = lgdt3306a_write_reg(state, 0x0010, nco1);
if (ret)
return ret;
ret = lgdt3306a_write_reg(state, 0x0011, nco2);
if (ret)
return ret;
lg_dbg("if_freq=%d KHz->[%04x]\n", if_freq_khz, nco1<<8 | nco2);
@ -1027,7 +1031,7 @@ static enum dvbfe_algo lgdt3306a_get_frontend_algo(struct dvb_frontend *fe)
}
/* ------------------------------------------------------------------------ */
static void lgdt3306a_monitor_vsb(struct lgdt3306a_state *state)
static int lgdt3306a_monitor_vsb(struct lgdt3306a_state *state)
{
u8 val;
int ret;
@ -1035,16 +1039,27 @@ static void lgdt3306a_monitor_vsb(struct lgdt3306a_state *state)
u16 fbDlyCir;
ret = lgdt3306a_read_reg(state, 0x21a1, &val);
if (ret)
return ret;
snrRef = val & 0x3f;
ret = lgdt3306a_read_reg(state, 0x2185, &maxPowerMan);
if (ret)
return ret;
ret = lgdt3306a_read_reg(state, 0x2191, &val);
if (ret)
return ret;
nCombDet = (val & 0x80) >> 7;
ret = lgdt3306a_read_reg(state, 0x2180, &val);
if (ret)
return ret;
fbDlyCir = (val & 0x03) << 8;
ret = lgdt3306a_read_reg(state, 0x2181, &val);
if (ret)
return ret;
fbDlyCir |= val;
lg_dbg("snrRef=%d maxPowerMan=0x%x nCombDet=%d fbDlyCir=0x%x\n",
@ -1052,6 +1067,8 @@ static void lgdt3306a_monitor_vsb(struct lgdt3306a_state *state)
/* Carrier offset sub loop bandwidth */
ret = lgdt3306a_read_reg(state, 0x1061, &val);
if (ret)
return ret;
val &= 0xf8;
if ((snrRef > 18) && (maxPowerMan > 0x68) && (nCombDet == 0x01) && ((fbDlyCir == 0x03FF) || (fbDlyCir < 0x6C))) {
/* SNR is over 18dB and no ghosting */
@ -1060,20 +1077,30 @@ static void lgdt3306a_monitor_vsb(struct lgdt3306a_state *state)
val |= 0x04; /* final bandwidth = 4 */
}
ret = lgdt3306a_write_reg(state, 0x1061, val);
if (ret)
return ret;
/* Adjust Notch Filter */
ret = lgdt3306a_read_reg(state, 0x0024, &val);
if (ret)
return ret;
val &= 0x0f;
if (nCombDet == 0) { /* Turn on the Notch Filter */
val |= 0x50;
}
ret = lgdt3306a_write_reg(state, 0x0024, val);
if (ret)
return ret;
/* VSB Timing Recovery output normalization */
ret = lgdt3306a_read_reg(state, 0x103d, &val);
if (ret)
return ret;
val &= 0xcf;
val |= 0x20;
ret = lgdt3306a_write_reg(state, 0x103d, val);
return ret;
}
static enum lgdt3306a_modulation lgdt3306a_check_oper_mode(struct lgdt3306a_state *state)
@ -1082,6 +1109,8 @@ static enum lgdt3306a_modulation lgdt3306a_check_oper_mode(struct lgdt3306a_stat
int ret;
ret = lgdt3306a_read_reg(state, 0x0081, &val);
if (ret)
goto err;
if (val & 0x80) {
lg_dbg("VSB\n");
@ -1089,6 +1118,8 @@ static enum lgdt3306a_modulation lgdt3306a_check_oper_mode(struct lgdt3306a_stat
}
if (val & 0x08) {
ret = lgdt3306a_read_reg(state, 0x00a6, &val);
if (ret)
goto err;
val = val >> 2;
if (val & 0x01) {
lg_dbg("QAM256\n");
@ -1098,6 +1129,7 @@ static enum lgdt3306a_modulation lgdt3306a_check_oper_mode(struct lgdt3306a_stat
return LG3306_QAM64;
}
}
err:
lg_warn("UNKNOWN\n");
return LG3306_UNKNOWN_MODE;
}
@ -1116,6 +1148,8 @@ static enum lgdt3306a_lock_status lgdt3306a_check_lock_status(struct lgdt3306a_s
case LG3306_SYNC_LOCK:
{
ret = lgdt3306a_read_reg(state, 0x00a6, &val);
if (ret)
return ret;
if ((val & 0x80) == 0x80)
lockStatus = LG3306_LOCK;
@ -1128,6 +1162,8 @@ static enum lgdt3306a_lock_status lgdt3306a_check_lock_status(struct lgdt3306a_s
case LG3306_AGC_LOCK:
{
ret = lgdt3306a_read_reg(state, 0x0080, &val);
if (ret)
return ret;
if ((val & 0x40) == 0x40)
lockStatus = LG3306_LOCK;
@ -1142,6 +1178,8 @@ static enum lgdt3306a_lock_status lgdt3306a_check_lock_status(struct lgdt3306a_s
modeOper = lgdt3306a_check_oper_mode(state);
if ((modeOper == LG3306_QAM64) || (modeOper == LG3306_QAM256)) {
ret = lgdt3306a_read_reg(state, 0x1094, &val);
if (ret)
return ret;
if ((val & 0x80) == 0x80)
lockStatus = LG3306_LOCK;
@ -1158,6 +1196,8 @@ static enum lgdt3306a_lock_status lgdt3306a_check_lock_status(struct lgdt3306a_s
modeOper = lgdt3306a_check_oper_mode(state);
if ((modeOper == LG3306_QAM64) || (modeOper == LG3306_QAM256)) {
ret = lgdt3306a_read_reg(state, 0x0080, &val);
if (ret)
return ret;
if ((val & 0x10) == 0x10)
lockStatus = LG3306_LOCK;
@ -1186,6 +1226,8 @@ static enum lgdt3306a_neverlock_status lgdt3306a_check_neverlock_status(struct l
enum lgdt3306a_neverlock_status lockStatus;
ret = lgdt3306a_read_reg(state, 0x0080, &val);
if (ret)
return ret;
lockStatus = (enum lgdt3306a_neverlock_status)(val & 0x03);
lg_dbg("NeverLock=%d", lockStatus);
@ -1193,7 +1235,7 @@ static enum lgdt3306a_neverlock_status lgdt3306a_check_neverlock_status(struct l
return lockStatus;
}
static void lgdt3306a_pre_monitoring(struct lgdt3306a_state *state)
static int lgdt3306a_pre_monitoring(struct lgdt3306a_state *state)
{
u8 val = 0;
int ret;
@ -1201,16 +1243,24 @@ static void lgdt3306a_pre_monitoring(struct lgdt3306a_state *state)
/* Channel variation */
ret = lgdt3306a_read_reg(state, 0x21bc, &currChDiffACQ);
if (ret)
return ret;
/* SNR of Frame sync */
ret = lgdt3306a_read_reg(state, 0x21a1, &val);
if (ret)
return ret;
snrRef = val & 0x3f;
/* Strong Main CIR */
ret = lgdt3306a_read_reg(state, 0x2199, &val);
if (ret)
return ret;
mainStrong = (val & 0x40) >> 6;
ret = lgdt3306a_read_reg(state, 0x0090, &val);
if (ret)
return ret;
aiccrejStatus = (val & 0xf0) >> 4;
lg_dbg("snrRef=%d mainStrong=%d aiccrejStatus=%d currChDiffACQ=0x%x\n",
@ -1221,30 +1271,50 @@ static void lgdt3306a_pre_monitoring(struct lgdt3306a_state *state)
#endif
if (mainStrong == 0) {
ret = lgdt3306a_read_reg(state, 0x2135, &val);
if (ret)
return ret;
val &= 0x0f;
val |= 0xa0;
ret = lgdt3306a_write_reg(state, 0x2135, val);
if (ret)
return ret;
ret = lgdt3306a_read_reg(state, 0x2141, &val);
if (ret)
return ret;
val &= 0x3f;
val |= 0x80;
ret = lgdt3306a_write_reg(state, 0x2141, val);
if (ret)
return ret;
ret = lgdt3306a_write_reg(state, 0x2122, 0x70);
if (ret)
return ret;
} else { /* Weak ghost or static channel */
ret = lgdt3306a_read_reg(state, 0x2135, &val);
if (ret)
return ret;
val &= 0x0f;
val |= 0x70;
ret = lgdt3306a_write_reg(state, 0x2135, val);
if (ret)
return ret;
ret = lgdt3306a_read_reg(state, 0x2141, &val);
if (ret)
return ret;
val &= 0x3f;
val |= 0x40;
ret = lgdt3306a_write_reg(state, 0x2141, val);
if (ret)
return ret;
ret = lgdt3306a_write_reg(state, 0x2122, 0x40);
if (ret)
return ret;
}
return 0;
}
static enum lgdt3306a_lock_status lgdt3306a_sync_lock_poll(struct lgdt3306a_state *state)
@ -1310,6 +1380,8 @@ static u8 lgdt3306a_get_packet_error(struct lgdt3306a_state *state)
int ret;
ret = lgdt3306a_read_reg(state, 0x00fa, &val);
if (ret)
return ret;
return val;
}
@ -1393,7 +1465,9 @@ static enum lgdt3306a_lock_status lgdt3306a_vsb_lock_poll(struct lgdt3306a_state
return LG3306_UNLOCK;
} else {
msleep(20);
lgdt3306a_pre_monitoring(state);
ret = lgdt3306a_pre_monitoring(state);
if (ret)
return LG3306_UNLOCK;
packet_error = lgdt3306a_get_packet_error(state);
snr = lgdt3306a_calculate_snr_x100(state);
@ -1483,7 +1557,7 @@ static int lgdt3306a_read_status(struct dvb_frontend *fe, fe_status_t *status)
*status |= FE_HAS_LOCK;
lgdt3306a_monitor_vsb(state);
ret = lgdt3306a_monitor_vsb(state);
}
break;
default: