commit 40eb90a18e93fbd4fd0e6892b31241356c3c8e43
author Anatol Pomozov <anatol.pomozov@gmail.com> Fri Oct 10 20:46:36 2014 -0700
committer Mark Brown <broonie@kernel.org> Mon Oct 20 12:22:20 2014 +0100
tree 401f2d17cb15f745d8f31a7045bff61be7315f15
parent 80fff6bf65dcae62255bdb592603dfc247c8cacf

ASoC: rt5677: Add option to configure gpio as floating/pullup/pulldown

gpio_config is array of 6 elements that allows to set GPIO as
floating, pullup, pulldown.

Sponsored: Google ChromeOS
Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5677.c

diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
index 16aa4d9..a454df3 100644
--- a/sound/soc/codecs/rt5677.c
+++ b/sound/soc/codecs/rt5677.c
@@ -3309,6 +3309,38 @@
 	return 0;
 }
 
+/** Configures the gpio as
+ *   0 - floating
+ *   1 - pull down
+ *   2 - pull up
+ */
+static void rt5677_gpio_config(struct rt5677_priv *rt5677, unsigned offset,
+		int value)
+{
+	int shift;
+
+	switch (offset) {
+	case RT5677_GPIO1 ... RT5677_GPIO2:
+		shift = 2 * (1 - offset);
+		regmap_update_bits(rt5677->regmap,
+			RT5677_PR_BASE + RT5677_DIG_IN_PIN_ST_CTRL2,
+			0x3 << shift,
+			(value & 0x3) << shift);
+		break;
+
+	case RT5677_GPIO3 ... RT5677_GPIO6:
+		shift = 2 * (9 - offset);
+		regmap_update_bits(rt5677->regmap,
+			RT5677_PR_BASE + RT5677_DIG_IN_PIN_ST_CTRL3,
+			0x3 << shift,
+			(value & 0x3) << shift);
+		break;
+
+	default:
+		break;
+	}
+}
+
 static struct gpio_chip rt5677_template_chip = {
 	.label			= "rt5677",
 	.owner			= THIS_MODULE,
@@ -3353,6 +3385,7 @@
 static int rt5677_probe(struct snd_soc_codec *codec)
 {
 	struct rt5677_priv *rt5677 = snd_soc_codec_get_drvdata(codec);
+	int i;
 
 	rt5677->codec = codec;
 
@@ -3371,6 +3404,9 @@
 	regmap_write(rt5677->regmap, RT5677_DIG_MISC, 0x0020);
 	regmap_write(rt5677->regmap, RT5677_PWR_DSP2, 0x0c00);
 
+	for (i = 0; i < RT5677_GPIO_NUM; i++)
+		rt5677_gpio_config(rt5677, i, rt5677->pdata.gpio_config[i]);
+
 	return 0;
 }
 
@@ -3590,6 +3626,9 @@
 			(rt5677->pow_ldo2 != -ENOENT))
 		return rt5677->pow_ldo2;
 
+	of_property_read_u8_array(np, "realtek,gpio-config",
+		rt5677->pdata.gpio_config, RT5677_GPIO_NUM);
+
 	return 0;
 }