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usb: typec: fsa4480: add support for Audio Accessory Mode

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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@linaro.org>
Tested-by: Krzysztof 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Neil Armstrong 2023-06-14 15:10:41 +02:00 committed by Greg Kroah-Hartman
parent c7054c31c1
commit ef1e29c6f6
1 changed files with 17 additions and 0 deletions
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17
drivers/usb/typec/mux/fsa4480.c
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@ -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);