[bionic][PATCH 2/4] UBUNTU: SAUCE: (no-up) ASoC: rt5660: Add ACPI support

[Shrirang Bagul]

BugLink: http://bugs.launchpad.net/bugs/1657674

On Dell IoT Gateways, RT5660 codec is available with ACPI ID 10EC3277.
Also, GPIO's are only available by index, so we register mappings to allow
machine drivers to access them by name.

Signed-off-by: Shrirang Bagul <shrirang.bagul at canonical.com>
Acked-by: Tim Gardner <tim.gardner at canonical.com>
Acked-by: Brad Figg <brad.figg at canonical.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
(cherry picked from commit 08b421848245f749d449f8db4d664e377f8100e3)
(source: git://kernel.ubuntu.com/ubuntu/ubuntu-xenial.git)
Signed-off-by: Shrirang Bagul <shrirang.bagul at canonical.com>
---
 sound/soc/codecs/rt5660.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/sound/soc/codecs/rt5660.c b/sound/soc/codecs/rt5660.c
index d22ef00e0d96..39dc2289d651 100644
--- a/sound/soc/codecs/rt5660.c
+++ b/sound/soc/codecs/rt5660.c
@@ -9,6 +9,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/acpi.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
@@ -1245,10 +1246,31 @@ MODULE_DEVICE_TABLE(of, rt5660_of_match);
 
 static const struct acpi_device_id rt5660_acpi_match[] = {
 	{ "10EC5660", 0 },
+	{ "10EC3277", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, rt5660_acpi_match);
 
+static const struct acpi_gpio_params audio_wake_intr_gpio = { 0, 0, false };
+static const struct acpi_gpio_params lineout_mute_gpio = { 1, 0, true };
+
+static const struct acpi_gpio_mapping byt_rt5660_gpios[] = {
+	{ "audio-wake-intr-gpios", &audio_wake_intr_gpio, 1 },
+	{ "lineout-mute-gpios", &lineout_mute_gpio , 1 },
+	{ NULL },
+};
+
+static void rt5660_read_acpi_properties(struct rt5660_priv *rt5660,
+		struct device *dev)
+{
+	int ret;
+
+	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev),
+			byt_rt5660_gpios);
+	if (ret)
+		dev_warn(dev, "Failed to add driver gpios\n");
+}
+
 static int rt5660_parse_dt(struct rt5660_priv *rt5660, struct device *dev)
 {
 	rt5660->pdata.in1_diff = device_property_read_bool(dev,
@@ -1288,6 +1310,10 @@ static int rt5660_i2c_probe(struct i2c_client *i2c,
 		rt5660->pdata = *pdata;
 	else if (i2c->dev.of_node)
 		rt5660_parse_dt(rt5660, &i2c->dev);
+	else if (ACPI_HANDLE(&i2c->dev))
+		rt5660_read_acpi_properties(rt5660, &i2c->dev);
+	else
+		return -EINVAL;
 
 	rt5660->regmap = devm_regmap_init_i2c(i2c, &rt5660_regmap);
 	if (IS_ERR(rt5660->regmap)) {
-- 
2.14.1