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/*
* This file is part of the coreboot project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/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;
/* I2C Bus Frequency in Hertz (default 400kHz) */
unsigned bus_speed;
/* Enable jack detection via JKDET pin */
unsigned jkdet_enable;
/* Enable JKDET pin pull if set, otherwise high impedance state */
unsigned jkdet_pull_enable;
/* Pull-up JKDET pin if set, otherwise pull down */
unsigned jkdet_pull_up;
/* JKDET pin polarity, 0 => active high, 1 => active low */
unsigned jkdet_polarity;
/*
* VREF Impedance selection
* 0 - Open
* 1 - 25 kOhm
* 2 - 125 kOhm
* 3 - 2.5 kOhm
*/
unsigned vref_impedance;
/* Button impedance measurement hysteresis */
unsigned 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 micbias_voltage;
unsigned sar_voltage;
/*
* SAR compare time
* 0 - 500 ns
* 1 - 1 us
* 2 - 2 us
* 3 - 4 us
*/
unsigned sar_compare_time;
/*
* SAR sampling time
* 0 - 2 us
* 1 - 4 us
* 2 - 8 us
* 3 - 16 us
*/
unsigned sar_sampling_time;
/*
* Button short key press debounce time
* 0 - 30 ms
* 1 - 50 ms
* 2 - 100 ms
* 3 - 30 ms
*/
unsigned short_key_debounce;
/* Debounce time 2^(n+2) ms (0-7) for jack insert */
unsigned jack_insert_debounce;
/* Debounce time 2^(n+2) ms (0-7) for jack eject */
unsigned jack_eject_debounce;
/* Number of buttons supported, up to 8 */
unsigned 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];
};
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