Commit ef1e29c6 authored by Neil Armstrong's avatar Neil Armstrong Committed by Greg Kroah-Hartman
Browse files

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: default avatarNeil Armstrong <neil.armstrong@linaro.org>
Tested-by: default avatarKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230614-topic-sm8550-upstream-type-c-audio-v1-3-15a92565146b@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c7054c31

drivers/usb/typec/mux/fsa4480.c

+17 −0
Original line number Diff line number Diff line
@@ -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);