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