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>

2 files changed, 75 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/au8522.c b/drivers/media/dvb/frontends/au8522.c
index f7b71657f0f6..5741bc930792 100644
--- 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 d7affa3cdb27..afc9af26e7a2 100644
--- 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) ||                               \