[PATCH] NOT FOR MERGING: Quick hack for droid 4 mdm6600 voice call

[Tony Lindgren]

Here's quick hack to allow making a voice call on mdm6600 based on
diffing the cpcap registers in Android. The patch just keeps overwriting
the cpcap values every second so it's nowhere near usable for merging,
just a test patch.

Looks like the cpcap register changes during a speaker phone audio call are:

@@ -510,17 +510,17 @@
 07f4: 0000
 07f8: 0000
 07fc: 0000
-0800: 0065
-0804: 0000
-0808: 0040
+0800: 0025     # CPCAP_REG_VAUDIOC     VAUDIO Control
+0804: 60cf     # CPCAP_REG_CC          Codec Control, moto cpcap.c:1337 sets 0x0093?
+0808: ae0a     # CPCAP_REG_CDI         Codec Digital Interface
 080c: 0000
 0810: 0004
-0814: 0804
-0818: 079c
-081c: 0000
-0820: 0924
-0824: 0000
-0828: 0000
+0814: 0cc0     # CPCAP_REG_TXI         TX Inputs, moto cpcap.c:1340 sets 0x0CC6?
+0818: 0610     # CPCAP_REG_TXMP        TX MIC PGA's, moto cpcap.c:1343 sets 0x0273?
+081c: 0006     # CPCAP_REG_RXOA        RX Output Amplifiers
+0820: 0b2c     # CPCAP_REG_RXVC        RX Volume Control
+0824: 0606     # CPCAP_REG_RXCOA       RX Codec to Output Amps
+0828: 0600     # CPCAP_REG_RXSDOA      RX Stereo DAC to Output Amps
 082c: 0400
 0830: 0000
 0834: 0030

I wonder if mdm6600 is the i2s master during the voice call?

Then using the n_gsm ts 27.010 uart mux, I dial:

./ngsm-rw 1 "AT+CFUN=1"		# connect to network
U0001+CFUN:OK
./ngsm-rw 2 "AT+CMUT=0"		# unmute speaker over ch2, do this over qmi?
U0001+CMUT:OK
./ngsm-rw 1 "ATD#123"		# dial number
U0001D:OK

And I do hear a voice talking over the speakerphone :) Sorry have not tested the
mic yet..

FYI, the ngsm-rw script I use is just:

#!/bin/sh

if [ "${1}" == "" ]; then
        echo "Usage: $0 port command"
        exit 1
fi

port=${1}
command=${2}

exec 3<>/dev/gsmtty${port}
printf "U0001%s\r\0" ${command} >&3
read result <&3
exec 3>&-
exec 3<&-

echo ${result}

My n_gsm patches are not quite ready yet sorry.. But meanwhile hopefully this
can be somehow also done using qmi. At least "AT+CMUT=0" fails over ttyUSB4.
---
 sound/soc/codecs/cpcap.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 69 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cpcap.c b/sound/soc/codecs/cpcap.c
--- a/sound/soc/codecs/cpcap.c
+++ b/sound/soc/codecs/cpcap.c
@@ -251,6 +251,8 @@ struct cpcap_audio {
 	int codec_clk_id;
 	int codec_freq;
 	int codec_format;
+
+	struct delayed_work work;
 };
 
 static int cpcap_st_workaround(struct snd_soc_dapm_widget *w,
@@ -1500,6 +1502,57 @@ static int cpcap_audio_reset(struct snd_soc_component *component,
 	return 0;
 }
 
+static void cpcap_soc_work(struct work_struct *work)
+{
+	struct cpcap_audio *cpcap = container_of(work,
+						 struct cpcap_audio,
+						 work.work);
+	struct device *dev = cpcap->component->dev;
+	int error;
+
+	dev_info(dev, "Somebody do a proper driver please %s\n", __func__);
+
+	error = regmap_update_bits(cpcap->regmap, CPCAP_REG_VAUDIOC,
+				   0xffff, 0x0025);
+	if (error)
+		goto out;
+	error = regmap_update_bits(cpcap->regmap, CPCAP_REG_CC,
+				   0xffff, 0x60cf);
+	if (error)
+		goto out;
+	error = regmap_update_bits(cpcap->regmap, CPCAP_REG_CDI,
+				   0xffff, 0xae0a);
+	if (error)
+		goto out;
+	error = regmap_update_bits(cpcap->regmap, CPCAP_REG_TXI,
+				   0xffff, 0x0cc0);
+	if (error)
+		goto out;
+	error = regmap_update_bits(cpcap->regmap, CPCAP_REG_TXMP,
+				   0xffff, 0x0610);
+	if (error)
+		goto out;
+	error = regmap_update_bits(cpcap->regmap, CPCAP_REG_RXOA,
+				   0xffff, 0x0006);
+	if (error)
+		goto out;
+	error = regmap_update_bits(cpcap->regmap, CPCAP_REG_RXVC,
+				   0xffff, 0x0b2c);
+	if (error)
+		goto out;
+	error = regmap_update_bits(cpcap->regmap, CPCAP_REG_RXCOA,
+				   0xffff, 0x0606);
+	if (error)
+		goto out;
+	error = regmap_update_bits(cpcap->regmap, CPCAP_REG_RXSDOA,
+				   0xffff, 0x0600);
+	if (error)
+		goto out;
+
+out:
+	schedule_delayed_work(&cpcap->work, msecs_to_jiffies(1000));
+}
+
 static int cpcap_soc_probe(struct snd_soc_component *component)
 {
 	struct cpcap_audio *cpcap;
@@ -1520,11 +1573,26 @@ static int cpcap_soc_probe(struct snd_soc_component *component)
 	if (err)
 		return err;
 
-	return cpcap_audio_reset(component, false);
+	err = cpcap_audio_reset(component, false);
+	if (err)
+		return err;
+
+	INIT_DELAYED_WORK(&cpcap->work, cpcap_soc_work);
+	schedule_delayed_work(&cpcap->work, msecs_to_jiffies(1000));
+
+	return 0;
+}
+
+static void cpcap_soc_remove(struct snd_soc_component *component)
+{
+	struct cpcap_audio *cpcap = snd_soc_component_get_drvdata(component);
+
+	cancel_delayed_work_sync(&cpcap->work);
 }
 
 static struct snd_soc_component_driver soc_codec_dev_cpcap = {
 	.probe			= cpcap_soc_probe,
+	.remove			= cpcap_soc_remove,
 	.controls		= cpcap_snd_controls,
 	.num_controls		= ARRAY_SIZE(cpcap_snd_controls),
 	.dapm_widgets		= cpcap_dapm_widgets,
-- 
2.16.3