Relocate platform specific drivers (#13894)

* Relocate platform specific drivers

* Move stm eeprom

* Tidy up slightly

platforms/avr/drivers/analog.h

@@ -0,0 +1,53 @@
+/* Copyright 2015 Jack Humbert
+ *
+ * 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, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include "quantum.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void    analogReference(uint8_t mode);
+int16_t analogRead(uint8_t pin);
+
+int16_t analogReadPin(pin_t pin);
+uint8_t pinToMux(pin_t pin);
+
+int16_t adc_read(uint8_t mux);
+#ifdef __cplusplus
+}
+#endif
+
+#define ADC_REF_EXTERNAL 0                          // AREF, Internal Vref turned off
+#define ADC_REF_POWER _BV(REFS0)                    // AVCC with external capacitor on AREF pin
+#define ADC_REF_INTERNAL (_BV(REFS1) | _BV(REFS0))  // Internal 2.56V Voltage Reference with external capacitor on AREF pin (1.1V for 328P)
+
+// These prescaler values are for high speed mode, ADHSM = 1
+#if F_CPU == 16000000L || F_CPU == 12000000L
+#    define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS1))  // /64
+#elif F_CPU == 8000000L
+#    define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS0))  // /32
+#elif F_CPU == 4000000L
+#    define ADC_PRESCALER (_BV(ADPS2))  // /16
+#elif F_CPU == 2000000L
+#    define ADC_PRESCALER (_BV(ADPS1) | _BV(ADPS0))  // /8
+#elif F_CPU == 1000000L
+#    define ADC_PRESCALER _BV(ADPS1)  // /4
+#else
+#    define ADC_PRESCALER _BV(ADPS0)  // /2
+#endif