From 463a3f9c284528008a54d124b9b3ad37d05dc14d Mon Sep 17 00:00:00 2001
From: Christian Daniel <cd@maintech.de>
Date: Tue, 6 Mar 2012 14:43:03 +0100
Subject: [PATCH] tuner_e4k: add setting for common mode

---
 firmware/include/tuner_e4k.h     |  1 +
 firmware/sdr-test-project/main.c | 20 ++++++++++++++++++++
 firmware/src/tuner_e4k.c         | 10 ++++++++++
 3 files changed, 31 insertions(+)

diff --git a/firmware/include/tuner_e4k.h b/firmware/include/tuner_e4k.h
index 579299a..26b9eaf 100644
--- a/firmware/include/tuner_e4k.h
+++ b/firmware/include/tuner_e4k.h
@@ -191,6 +191,7 @@ struct e4k_state {
 int e4k_init(struct e4k_state *e4k);
 int e4k_if_gain_set(struct e4k_state *e4k, uint8_t stage, int8_t value);
 int e4k_mixer_gain_set(struct e4k_state *e4k, int8_t value);
+int e4k_commonmode_set(struct e4k_state *e4k, int8_t value);
 int e4k_tune_freq(struct e4k_state *e4k, uint32_t freq);
 int e4k_tune_params(struct e4k_state *e4k, struct e4k_pll_params *p);
 int e4k_compute_pll_params(struct e4k_pll_params *oscp, uint32_t fosc, uint32_t intended_flo);
diff --git a/firmware/sdr-test-project/main.c b/firmware/sdr-test-project/main.c
index 20684a4..e46ea03 100644
--- a/firmware/sdr-test-project/main.c
+++ b/firmware/sdr-test-project/main.c
@@ -295,6 +295,24 @@ static int cmd_tuner_dco_table(struct cmd_state *cs, enum cmd_op op,
 	return e4k_dc_offset_gen_table(&e4k);
 }
 
+static int cmd_tuner_commonmode(struct cmd_state *cs, enum cmd_op op,
+			const char *cmd, int argc, char **argv)
+{
+	int32_t cm;
+
+	switch (op) {
+	case CMD_OP_SET:
+		if (argc < 1)
+			return -EINVAL;
+		cm = strtoul(argv[0], NULL, 10);
+		e4k_commonmode_set(&e4k, cm);
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
 static struct cmd cmds[] = {
 	{ "tuner.init", CMD_OP_EXEC, cmd_tuner_init,
 	  "Initialize the tuner" },
@@ -312,6 +330,8 @@ static struct cmd cmds[] = {
 	  "Perform DC offset calibration" },
 	{ "tuner.dc_table", CMD_OP_EXEC, cmd_tuner_dco_table,
 	  "Generate DC offset table" },
+	{ "tuner.commonmode", CMD_OP_SET, cmd_tuner_commonmode,
+	  "Switch common mode voltage" },
 
 	{ "si570.freq", CMD_OP_SET|CMD_OP_GET, cmd_si570_freq,
 	  "Change the SI570 clock frequency" },
diff --git a/firmware/src/tuner_e4k.c b/firmware/src/tuner_e4k.c
index 56a49da..ddbecbe 100644
--- a/firmware/src/tuner_e4k.c
+++ b/firmware/src/tuner_e4k.c
@@ -714,6 +714,16 @@ int e4k_mixer_gain_set(struct e4k_state *e4k, int8_t value)
 	return e4k_reg_set_mask(e4k, E4K_REG_GAIN2, 1, bit);
 }
 
+int e4k_commonmode_set(struct e4k_state *e4k, int8_t value)
+{
+	if(value < 0)
+		return -EINVAL;
+	else if(value > 7)
+		return -EINVAL;
+
+	return e4k_reg_set_mask(e4k, E4K_REG_DC7, 7, value);
+}
+
 /*********************************************************************** 
  * DC Offset */