1 files changed, 96 insertions, 0 deletions
diff --git a/src/drivers/i2c/nau8825/chip.h b/src/drivers/i2c/nau8825/chip.h
new file mode 100644
index 0000000000..e6c88bc4e7
--- /dev/null
+++ b/src/drivers/i2c/nau8825/chip.h
@@ -0,0 +1,96 @@
+#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];
+};