[PATCH] ASoC: nau8821: Add DMI quirk mechanism for active-high jack-detect

[Edson Juliano Drosdeck <edson.drosdeck@gmail.com>]

Add a quirk mechanism to allow specifying that active-high jack-detection
should be used on platforms where this info is not available in devicetree.

And add an entry for the Positivo CW14Q01P-V2 to the DMI table, so that
jack-detection will work properly on this laptop.

Signed-off-by: Edson Juliano Drosdeck <edson.drosdeck@gmail.com>
---
 sound/soc/codecs/nau8821.c | 41 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/sound/soc/codecs/nau8821.c b/sound/soc/codecs/nau8821.c
index 96d75882b33a..ca6beb2d2649 100644
--- a/sound/soc/codecs/nau8821.c
+++ b/sound/soc/codecs/nau8821.c
@@ -10,6 +10,7 @@
 #include <linux/acpi.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/dmi.h>
 #include <linux/init.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
@@ -25,6 +26,13 @@
 #include <sound/tlv.h>
 #include "nau8821.h"
 
+#define NAU8821_JD_ACTIVE_HIGH			BIT(0)
+
+static int nau8821_quirk;
+static int quirk_override = -1;
+module_param_named(quirk, quirk_override, uint, 0444);
+MODULE_PARM_DESC(quirk, "Board-specific quirk override");
+
 #define NAU_FREF_MAX 13500000
 #define NAU_FVCO_MAX 100000000
 #define NAU_FVCO_MIN 90000000
@@ -1792,6 +1800,33 @@ static int nau8821_setup_irq(struct nau8821 *nau8821)
 	return 0;
 }
 
+/* Please keep this list alphabetically sorted */
+static const struct dmi_system_id nau8821_quirk_table[] = {
+	{
+		/* Positivo CW14Q01P-V2 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Positivo Tecnologia SA"),
+			DMI_MATCH(DMI_BOARD_NAME, "CW14Q01P-V2"),
+		},
+		.driver_data = (void *)(NAU8821_JD_ACTIVE_HIGH),
+	},
+	{}
+};
+
+static void nau8821_check_quirks(void)
+{
+	const struct dmi_system_id *dmi_id;
+
+	if (quirk_override != -1) {
+		nau8821_quirk = quirk_override;
+		return;
+	}
+
+	dmi_id = dmi_first_match(nau8821_quirk_table);
+	if (dmi_id)
+		nau8821_quirk = (unsigned long)dmi_id->driver_data;
+}
+
 static int nau8821_i2c_probe(struct i2c_client *i2c)
 {
 	struct device *dev = &i2c->dev;
@@ -1812,6 +1847,12 @@ static int nau8821_i2c_probe(struct i2c_client *i2c)
 
 	nau8821->dev = dev;
 	nau8821->irq = i2c->irq;
+
+	nau8821_check_quirks();
+
+	if (nau8821_quirk & NAU8821_JD_ACTIVE_HIGH)
+		nau8821->jkdet_polarity = 0;
+
 	nau8821_print_device_properties(nau8821);
 
 	nau8821_reset_chip(nau8821->regmap);
-- 
2.39.2