Convert the existing data struct to use the QAM modulation macros,
instead of assuming that they're numbered from 0 to 5.
Signed-off-by: Mauro Carvalho Chehab <mche...@redhat.com>
---
drivers/media/dvb/frontends/tda10023.c | 66 +++++++++++++++++++++-----------
1 files changed, 43 insertions(+), 23 deletions(-)
diff --git a/drivers/media/dvb/frontends/tda10023.c
b/drivers/media/dvb/frontends/tda10023.c
index a3c34ee..e6c321e 100644
--- a/drivers/media/dvb/frontends/tda10023.c
+++ b/drivers/media/dvb/frontends/tda10023.c
@@ -298,25 +298,43 @@ static int tda10023_init (struct dvb_frontend *fe)
return 0;
}
+struct qam_params {
+ u8 qam, lockthr, mseth, aref, agcrefnyq, eragnyq_thd;
+};
+
static int tda10023_set_parameters (struct dvb_frontend *fe,
struct dvb_frontend_parameters *p)
{
struct tda10023_state* state = fe->demodulator_priv;
-
- static int qamvals[6][6] = {
- // QAM LOCKTHR MSETH AREF AGCREFNYQ ERAGCNYQ_THD
- { (5<<2), 0x78, 0x8c, 0x96, 0x78, 0x4c }, // 4 QAM
- { (0<<2), 0x87, 0xa2, 0x91, 0x8c, 0x57 }, // 16 QAM
- { (1<<2), 0x64, 0x74, 0x96, 0x8c, 0x57 }, // 32 QAM
- { (2<<2), 0x46, 0x43, 0x6a, 0x6a, 0x44 }, // 64 QAM
- { (3<<2), 0x36, 0x34, 0x7e, 0x78, 0x4c }, // 128 QAM
- { (4<<2), 0x26, 0x23, 0x6c, 0x5c, 0x3c }, // 256 QAM
+ static const struct qam_params qam_params[] = {
+ /* Modulation QAM LOCKTHR MSETH AREF AGCREFNYQ
ERAGCNYQ_THD */
+ [QPSK] = { (5<<2), 0x78, 0x8c, 0x96, 0x78, 0x4c },
+ [QAM_16] = { (0<<2), 0x87, 0xa2, 0x91, 0x8c, 0x57 },
+ [QAM_32] = { (1<<2), 0x64, 0x74, 0x96, 0x8c, 0x57 },
+ [QAM_64] = { (2<<2), 0x46, 0x43, 0x6a, 0x6a, 0x44 },
+ [QAM_128] = { (3<<2), 0x36, 0x34, 0x7e, 0x78, 0x4c },
+ [QAM_256] = { (4<<2), 0x26, 0x23, 0x6c, 0x5c, 0x3c },
};
-
- int qam = p->u.qam.modulation;
-
- if (qam < 0 || qam > 5)
+ unsigned qam = p->u.qam.modulation;
+
+ /*
+ * gcc optimizes the code bellow the same way as it would code:
+ * "if (qam > 5) return -EINVAL;"
+ * Yet, the code is clearer, as it shows what QAM standards are
+ * supported by the driver, and avoids the usage of magic numbers on
+ * it.
+ */
+ switch (qam) {
+ case QPSK:
+ case QAM_16:
+ case QAM_32:
+ case QAM_64:
+ case QAM_128:
+ case QAM_256:
+ break;
+ default:
return -EINVAL;
+ }
if (fe->ops.tuner_ops.set_params) {
fe->ops.tuner_ops.set_params(fe, p);
@@ -324,16 +342,18 @@ static int tda10023_set_parameters (struct dvb_frontend
*fe,
}
tda10023_set_symbolrate (state, p->u.qam.symbol_rate);
- tda10023_writereg (state, 0x05, qamvals[qam][1]);
- tda10023_writereg (state, 0x08, qamvals[qam][2]);
- tda10023_writereg (state, 0x09, qamvals[qam][3]);
- tda10023_writereg (state, 0xb4, qamvals[qam][4]);
- tda10023_writereg (state, 0xb6, qamvals[qam][5]);
-
-// tda10023_writereg (state, 0x04, (p->inversion?0x12:0x32));
-// tda10023_writebit (state, 0x04, 0x60, (p->inversion?0:0x20));
- tda10023_writebit (state, 0x04, 0x40, 0x40);
- tda10023_setup_reg0 (state, qamvals[qam][0]);
+ tda10023_writereg(state, 0x05, qam_params[qam].lockthr);
+ tda10023_writereg(state, 0x08, qam_params[qam].mseth);
+ tda10023_writereg(state, 0x09, qam_params[qam].aref);
+ tda10023_writereg(state, 0xb4, qam_params[qam].agcrefnyq);
+ tda10023_writereg(state, 0xb6, qam_params[qam].eragnyq_thd);
+
+#if 0
+ tda10023_writereg(state, 0x04, (p->inversion ? 0x12 : 0x32));
+ tda10023_writebit(state, 0x04, 0x60, (p->inversion ? 0 : 0x20));
+#endif
+ tda10023_writebit(state, 0x04, 0x40, 0x40);
+ tda10023_setup_reg0(state, qam_params[qam].qam);
return 0;
}
--
1.7.8.352.g876a6
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