chip.h

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <acpi/acpi_device.h>
 
#define NAU8825_MAX_BUTTONS 8
 
/*
 * Nuvoton NAU8825 audio codec devicetree bindings
 * linux/Documentation/devicetree/bindings/sound/nau8825.txt
 */
struct drivers_i2c_nau8825_config {
        /* Interrupt configuration */
        struct acpi_irq irq;
        struct acpi_gpio irq_gpio;
 
        /* I2C Bus Frequency in Hertz (default 400kHz) */
        unsigned int bus_speed;
 
        /* Enable jack detection via JKDET pin */
        unsigned int jkdet_enable;
 
        /* Enable JKDET pin pull if set, otherwise high impedance state */
        unsigned int jkdet_pull_enable;
 
        /* Pull-up JKDET pin if set, otherwise pull down */
        unsigned int jkdet_pull_up;
 
        /* JKDET pin polarity, 0 => active high, 1 => active low */
        unsigned int jkdet_polarity;
 
        /*
         * VREF Impedance selection
         *  0 - Open
         *  1 - 25 kOhm
         *  2 - 125 kOhm
         *  3 - 2.5 kOhm
         */
        unsigned int vref_impedance;
 
        /* Button impedance measurement hysteresis */
        unsigned int sar_hysteresis;
 
        /*
         * Reference voltage for button impedance measurement and micbias
         *  0 - VDDA
         *  1 - VDDA
         *  2 - VDDA * 1.1
         *  3 - VDDA * 1.2
         *  4 - VDDA * 1.3
         *  5 - VDDA * 1.4
         *  6 - VDDA * 1.53
         *  7 - VDDA * 1.53
         */
        unsigned int micbias_voltage;
        unsigned int sar_voltage;
 
        /*
         * SAR compare time
         *  0 - 500 ns
         *  1 - 1 us
         *  2 - 2 us
         *  3 - 4 us
         */
        unsigned int sar_compare_time;
 
        /*
         * SAR sampling time
         *  0 - 2 us
         *  1 - 4 us
         *  2 - 8 us
         *  3 - 16 us
         */
        unsigned int sar_sampling_time;
 
        /*
         * Button short key press debounce time
         *  0 - 30 ms
         *  1 - 50 ms
         *  2 - 100 ms
         *  3 - 30 ms
         */
        unsigned int short_key_debounce;
 
        /* Debounce time 2^(n+2) ms (0-7) for jack insert */
        unsigned int jack_insert_debounce;
 
        /* Debounce time 2^(n+2) ms (0-7) for jack eject */
        unsigned int jack_eject_debounce;
 
        /* Number of buttons supported, up to 8 */
        unsigned int sar_threshold_num;
 
        /*
         * Impedance threshold for each button, up to 8
         *  SAR = 255 * micbias_voltage / sar_voltage * R / (2000 + R)
         *  R is Button impedance
         */
        uint64_t sar_threshold[NAU8825_MAX_BUTTONS];
};