V4L/DVB (8555): au8522: add mechanism to configure IF frequency for vsb and qam

Add a mechanism to configure IF frequency for vsb and qam.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/dvb/frontends/au8522.c b/drivers/media/dvb/frontends/au8522.c
index f7b71657f0f6324f57891d470faf1d2a4f30275f..5741bc930792469272011922e07b2cfb5732de30 100644 (file)
--- a/drivers/media/dvb/frontends/au8522.c
+++ b/drivers/media/dvb/frontends/au8522.c
@@ -304,6 +304,70 @@ static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
        return ret;
 }
 
+/* 3.25 MHz IF Frequency table */
+static struct {
+       u16 reg;
+       u16 data;
+} if_3_25_mhz_tab[] = {
+       { 0x80b5, 0x00 },
+       { 0x80b6, 0x3d },
+       { 0x80b7, 0xa0 },
+};
+
+/* 4.00 MHz IF Frequency table */
+static struct {
+       u16 reg;
+       u16 data;
+} if_4_mhz_tab[] = {
+       { 0x80b5, 0x00 },
+       { 0x80b6, 0x4b },
+       { 0x80b7, 0xd9 },
+};
+
+/* 6.00 MHz IF Frequency table */
+static struct {
+       u16 reg;
+       u16 data;
+} if_6_mhz_tab[] = {
+       { 0x80b5, 0xfb },
+       { 0x80b6, 0x8e },
+       { 0x80b7, 0x39 },
+};
+
+static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
+{
+       struct au8522_state *state = fe->demodulator_priv;
+       int i;
+
+       switch (if_freq) {
+       case AU8522_IF_3_25MHZ:
+               dprintk("%s() 3.25 MHz\n", __func__);
+               for (i = 0; i < ARRAY_SIZE(if_3_25_mhz_tab); i++)
+                       au8522_writereg(state,
+                                       if_3_25_mhz_tab[i].reg,
+                                       if_3_25_mhz_tab[i].data);
+               break;
+       case AU8522_IF_4MHZ:
+               dprintk("%s() 4.00 MHz\n", __func__);
+               for (i = 0; i < ARRAY_SIZE(if_4_mhz_tab); i++)
+                       au8522_writereg(state,
+                                       if_4_mhz_tab[i].reg,
+                                       if_4_mhz_tab[i].data);
+               break;
+       case AU8522_IF_6MHZ:
+               dprintk("%s() 6.00 MHz\n", __func__);
+               for (i = 0; i < ARRAY_SIZE(if_6_mhz_tab); i++)
+                       au8522_writereg(state,
+                                       if_6_mhz_tab[i].reg,
+                                       if_6_mhz_tab[i].data);
+               break;
+       default:
+               dprintk("%s() IF Frequency not supported\n", __func__);
+               return -EINVAL;
+       }
+       return 0;
+}
+
 /* VSB Modulation table */
 static struct {
        u16 reg;
@@ -438,6 +502,7 @@ static int au8522_enable_modulation(struct dvb_frontend *fe,
                        au8522_writereg(state,
                                VSB_mod_tab[i].reg,
                                VSB_mod_tab[i].data);
+               au8522_set_if(fe, state->config->vsb_if);
                break;
        case QAM_64:
        case QAM_256:
@@ -446,6 +511,7 @@ static int au8522_enable_modulation(struct dvb_frontend *fe,
                        au8522_writereg(state,
                                QAM_mod_tab[i].reg,
                                QAM_mod_tab[i].data);
+               au8522_set_if(fe, state->config->qam_if);
                break;
        default:
                dprintk("%s() Invalid modulation\n", __func__);

diff --git a/drivers/media/dvb/frontends/au8522.h b/drivers/media/dvb/frontends/au8522.h
index d7affa3cdb27536190d24293ca658729740b95e5..afc9af26e7a204b8ae03c52fc188ec6c06510976 100644 (file)
--- a/drivers/media/dvb/frontends/au8522.h
+++ b/drivers/media/dvb/frontends/au8522.h
@@ -24,6 +24,12 @@
 
 #include <linux/dvb/frontend.h>
 
+enum au8522_if_freq {
+       AU8522_IF_6MHZ = 0,
+       AU8522_IF_4MHZ,
+       AU8522_IF_3_25MHZ,
+};
+
 struct au8522_config {
        /* the demodulator's i2c address */
        u8 demod_address;
@@ -32,6 +38,9 @@ struct au8522_config {
 #define AU8522_TUNERLOCKING 0
 #define AU8522_DEMODLOCKING 1
        u8 status_mode;
+
+       enum au8522_if_freq vsb_if;
+       enum au8522_if_freq qam_if;
 };
 
 #if defined(CONFIG_DVB_AU8522) ||                              \