From 0b0bcc80bf689592dcb3236eed3e166d82cd7802 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Sun, 26 Dec 2021 16:05:02 +0100
Subject: add basic MAX44006 driver

---
 src/driver/Kconfig     |  5 +++-
 src/driver/max44006.cc | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+), 1 deletion(-)
 create mode 100644 src/driver/max44006.cc

(limited to 'src/driver')

diff --git a/src/driver/Kconfig b/src/driver/Kconfig
index 13e0dc5..4b3693c 100644
--- a/src/driver/Kconfig
+++ b/src/driver/Kconfig
@@ -56,7 +56,10 @@ depends on meta_driver_i2c
 config driver_lm75
 bool "LM75 Temperature Sensor"
 depends on meta_driver_i2c
-# depends on I2C
+
+config driver_max44006
+bool "MAX44006 RGB + IR Sensor"
+depends on meta_driver_i2c
 
 config driver_max44009
 bool "MAX44009 Ambient Light Sensor"
diff --git a/src/driver/max44006.cc b/src/driver/max44006.cc
new file mode 100644
index 0000000..e9b9467
--- /dev/null
+++ b/src/driver/max44006.cc
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2020 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Driver for MAX44006 RGB, IR, and Temperature Sensor.
+ * Does not support interrupts.
+ */
+#include "driver/max44006.h"
+#if defined(CONFIG_meta_driver_hardware_i2c)
+#include "driver/i2c.h"
+#elif defined(CONFIG_driver_softi2c)
+#include "driver/soft_i2c.h"
+#endif
+
+#include "arch.h"
+
+uint8_t MAX44006::init()
+{
+	txbuf[0] = interruptStatusReg;
+	if (i2c.xmit(address, 1, txbuf, 1, rxbuf) != 0) {
+		return 1;
+	}
+
+	if (rxbuf[0] & ~PWRON) {
+		// reset sensor
+		txbuf[1] = 0x10;
+		if (i2c.xmit(address, 2, txbuf, 0, rxbuf) != 0) {
+			return 1;
+		}
+		arch.delay_ms(200);
+		if (i2c.xmit(address, 1, txbuf, 1, rxbuf) != 0) {
+			return 1;
+		}
+		if (rxbuf[0] & ~PWRON) {
+			return 2;
+		}
+	}
+
+	txbuf[0] = ambientConfigReg;
+	txbuf[1] = TEMPEN; // TEMPEN = 1
+	if (i2c.xmit(address, 2, txbuf, 0, rxbuf) != 0) {
+		return 1;
+	}
+
+	txbuf[0] = mainConfigReg;
+	txbuf[1] = MODE_10; // MODE = 10 -> Clear + RGB + IR measurement
+	if (i2c.xmit(address, 2, txbuf, 0, rxbuf) != 0) {
+		return 1;
+	}
+
+	return 0;
+}
+
+uint16_t MAX44006::getTemperature()
+{
+	txbuf[0] = 0x12;
+	if (i2c.xmit(address, 1, txbuf, 2, rxbuf) != 0) {
+		return 0;
+	}
+
+	return (((uint16_t)rxbuf[0] << 8) + rxbuf[1]);
+}
+
+bool MAX44006::getLight(float *red, float *green, float *blue, float *clear, float *ir)
+{
+	txbuf[0] = 0x04;
+	if (i2c.xmit(address, 1, txbuf, 10, rxbuf) != 0) {
+		return false;
+	}
+
+	*clear = (float)(((uint16_t)rxbuf[0] << 8) + rxbuf[1]) * 0.002;
+	*red   = (float)(((uint16_t)rxbuf[2] << 8) + rxbuf[3]) * 0.002;
+	*green = (float)(((uint16_t)rxbuf[4] << 8) + rxbuf[5]) * 0.002;
+	*blue  = (float)(((uint16_t)rxbuf[6] << 8) + rxbuf[7]) * 0.004;
+	*ir    = (float)(((uint16_t)rxbuf[8] << 8) + rxbuf[9]) * 0.002;
+
+	return true;
+}
+
+MAX44006 max44006(0x45);
-- 
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