linux-kernel - [PATCH 3/3] usb: typec: fsa4480: add support for Audio Accessory Mode

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Message-Id: <20230614-topic-sm8550-upstream-type-c-audio-v1-3-15a92565146b@linaro.org>
Date:   Wed, 14 Jun 2023 15:10:41 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH 3/3] usb: typec: fsa4480: add support for Audio Accessory
 Mode

The FSA4480 Type-C switch supports switching the Audio R/L,
AGND and MIC signals to the USB-C DP/DM and SBU1/2 to support
the Audio Accessory Mode.

The FSA4480 has an integrated Audio jack detection mechanism
to automatically mux the AGND, MIX and Sense to the correct
SBU lines to support 3 pole and both 4 pole TRRS pinouts.

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
 drivers/usb/typec/mux/fsa4480.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/usb/typec/mux/fsa4480.c b/drivers/usb/typec/mux/fsa4480.c
index b2913594a58f..45f5683b7d81 100644
--- a/drivers/usb/typec/mux/fsa4480.c
+++ b/drivers/usb/typec/mux/fsa4480.c
@@ -25,15 +25,24 @@
 #define FSA4480_DELAY_L_MIC	0x0e
 #define FSA4480_DELAY_L_SENSE	0x0f
 #define FSA4480_DELAY_L_AGND	0x10
+#define FSA4480_FUNCTION_ENABLE	0x12
 #define FSA4480_RESET		0x1e
 #define FSA4480_MAX_REGISTER	0x1f
 
 #define FSA4480_ENABLE_DEVICE	BIT(7)
 #define FSA4480_ENABLE_SBU	GENMASK(6, 5)
 #define FSA4480_ENABLE_USB	GENMASK(4, 3)
+#define FSA4480_ENABLE_SENSE	BIT(2)
+#define FSA4480_ENABLE_MIC	BIT(1)
+#define FSA4480_ENABLE_AGND	BIT(0)
 
 #define FSA4480_SEL_SBU_REVERSE	GENMASK(6, 5)
 #define FSA4480_SEL_USB		GENMASK(4, 3)
+#define FSA4480_SEL_SENSE	BIT(2)
+#define FSA4480_SEL_MIC		BIT(1)
+#define FSA4480_SEL_AGND	BIT(0)
+
+#define FSA4480_ENABLE_AUTO_JACK_DETECT	BIT(0)
 
 struct fsa4480 {
 	struct i2c_client *client;
@@ -95,6 +104,9 @@ static int fsa4480_set(struct fsa4480 *fsa)
 		default:
 			return -EOPNOTSUPP;
 		}
+	} else if (fsa->mode == TYPEC_MODE_AUDIO) {
+		/* Audio Accessory Mode, setup to auto Jack Detection */
+		enable |= FSA4480_ENABLE_USB | FSA4480_ENABLE_AGND;
 	} else
 		return -EOPNOTSUPP;
 
@@ -110,6 +122,11 @@ static int fsa4480_set(struct fsa4480 *fsa)
 	regmap_write(fsa->regmap, FSA4480_SWITCH_SELECT, sel);
 	regmap_write(fsa->regmap, FSA4480_SWITCH_ENABLE, enable);
 
+	/* Start AUDIO JACK DETECTION to setup MIC, AGND & Sense muxes */
+	if (enable & FSA4480_ENABLE_AGND)
+		regmap_write(fsa->regmap, FSA4480_FUNCTION_ENABLE,
+			     FSA4480_ENABLE_AUTO_JACK_DETECT);
+
 	if (enable & FSA4480_ENABLE_SBU) {
 		/* 15us to allow the SBU switch to turn on again */
 		usleep_range(15, 1000);

-- 
2.34.1