[media] tda10021: Add support for DVB-C Annex C

While tda10021 supports both DVB-C Annex A and C, it is currently
hard-coded to Annex A. Add support for Annex C and re-work the
code in order to report the delivery systems, thans to Andreas,
that passed us the register settings for the Roll-off factor.

Thanks-to: Andreas Oberriter <obi@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb/frontends/tda10021.c b/drivers/media/dvb/frontends/tda10021.c
index cd9952e..2518c5a 100644 (file)
--- a/drivers/media/dvb/frontends/tda10021.c
+++ b/drivers/media/dvb/frontends/tda10021.c
@@ -231,6 +231,11 @@ struct qam_params {
 static int tda10021_set_parameters (struct dvb_frontend *fe,
                            struct dvb_frontend_parameters *p)
 {
+       struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+       u32 delsys  = c->delivery_system;
+       unsigned qam = c->modulation;
+       bool is_annex_c;
+       u32 reg0x3d;
        struct tda10021_state* state = fe->demodulator_priv;
        static const struct qam_params qam_params[] = {
                /* Modulation  Conf  AGCref  LTHR  MSETH  AREF */
@@ -241,7 +246,17 @@ static int tda10021_set_parameters (struct dvb_frontend *fe,
                [QAM_128]  = { 0x0c, 0x78,   0x36, 0x34,  0x7e },
                [QAM_256]  = { 0x10, 0x5c,   0x26, 0x23,  0x6b },
        };
-       int qam = p->u.qam.modulation;
+
+       switch (delsys) {
+       case SYS_DVBC_ANNEX_A:
+               is_annex_c = false;
+               break;
+       case SYS_DVBC_ANNEX_C:
+               is_annex_c = true;
+               break;
+       default:
+               return -EINVAL;
+       }
 
        /*
         * gcc optimizes the code bellow the same way as it would code:
@@ -262,7 +277,7 @@ static int tda10021_set_parameters (struct dvb_frontend *fe,
                return -EINVAL;
        }
 
-       if (p->inversion != INVERSION_ON && p->inversion != INVERSION_OFF)
+       if (c->inversion != INVERSION_ON && c->inversion != INVERSION_OFF)
                return -EINVAL;
 
        //printk("tda10021: set frequency to %d qam=%d symrate=%d\n", p->frequency,qam,p->u.qam.symbol_rate);
@@ -272,14 +287,24 @@ static int tda10021_set_parameters (struct dvb_frontend *fe,
                if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
        }
 
-       tda10021_set_symbolrate(state, p->u.qam.symbol_rate);
+       tda10021_set_symbolrate(state, c->symbol_rate);
        _tda10021_writereg(state, 0x34, state->pwm);
 
        _tda10021_writereg(state, 0x01, qam_params[qam].agcref);
        _tda10021_writereg(state, 0x05, qam_params[qam].lthr);
        _tda10021_writereg(state, 0x08, qam_params[qam].mseth);
        _tda10021_writereg(state, 0x09, qam_params[qam].aref);
-       tda10021_setup_reg0(state, qam_params[qam].conf, p->inversion);
+
+       /*
+        * Bit 0 == 0 means roll-off = 0.15 (Annex A)
+        *       == 1 means roll-off = 0.13 (Annex C)
+        */
+       reg0x3d = tda10021_readreg (state, 0x3d);
+       if (is_annex_c)
+               _tda10021_writereg (state, 0x3d, 0x01 | reg0x3d);
+       else
+               _tda10021_writereg (state, 0x3d, 0xfe & reg0x3d);
+       tda10021_setup_reg0(state, qam_params[qam].conf, c->inversion);
 
        return 0;
 }
@@ -458,6 +483,21 @@ error:
        return NULL;
 }
 
+static int tda10021_get_property(struct dvb_frontend *fe,
+                                struct dtv_property *p)
+{
+       switch (p->cmd) {
+       case DTV_ENUM_DELSYS:
+               p->u.buffer.data[0] = SYS_DVBC_ANNEX_A;
+               p->u.buffer.data[1] = SYS_DVBC_ANNEX_C;
+               p->u.buffer.len = 2;
+               break;
+       default:
+               break;
+       }
+       return 0;
+}
+
 static struct dvb_frontend_ops tda10021_ops = {
 
        .info = {
@@ -486,6 +526,7 @@ static struct dvb_frontend_ops tda10021_ops = {
 
        .set_frontend = tda10021_set_parameters,
        .get_frontend = tda10021_get_frontend,
+       .get_property = tda10021_get_property,
 
        .read_status = tda10021_read_status,
        .read_ber = tda10021_read_ber,