Renames keyboard folder to keyboards, adds couple of tmk's fixes (#432)

* fixes from tmk's repo

* rename keyboard to keyboards

keyboards/satan/satan.c

@@ -0,0 +1,94 @@
+#include "satan.h"
+
+#ifdef BACKLIGHT_ENABLE
+#include "backlight.h"
+#endif
+
+__attribute__ ((weak))
+void matrix_init_user(void) {
+	// leave these blank
+};
+
+__attribute__ ((weak))
+void matrix_scan_user(void) {
+	// leave these blank
+};
+
+
+#ifdef BACKLIGHT_ENABLE
+
+void backlight_init_ports()
+{
+
+    // Setup PB6 as output and output low.
+    DDRB |= (1<<6);
+    PORTB &= ~(1<<6);
+
+    // Use full 16-bit resolution.
+    ICR1 = 0xFFFF;
+
+    // I could write a wall of text here to explain... but TL;DW
+    // Go read the ATmega32u4 datasheet.
+    // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on
+
+    // Pin PB6 = OCR1B (Timer 1, Channel C)
+    // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0
+    // (i.e. start high, go low when counter matches.)
+    // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0
+    // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1
+
+    TCCR1A = _BV(COM1B1) | _BV(WGM11); // = 0b00001010;
+    TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001;
+
+    backlight_init();
+}
+
+void backlight_set(uint8_t level)
+{
+    // Prevent backlight blink on lowest level
+    PORTB &= ~(_BV(PORTB6));
+
+    if ( level == 0 )
+    {
+        // Turn off PWM control on PB6, revert to output low.
+        TCCR1A &= ~(_BV(COM1B1));
+        OCR1B = 0x0;
+    }
+    else if ( level == BACKLIGHT_LEVELS )
+    {
+        // Turn on PWM control of PB6
+        TCCR1A |= _BV(COM1B1);
+        // Set the brightness
+        OCR1B = 0xFFFF;
+    }
+    else
+    {
+        // Turn on PWM control of PB6
+        TCCR1A |= _BV(COM1B1);
+        // Set the brightness
+        OCR1B = 0xFFFF >> ((BACKLIGHT_LEVELS - level) * ((BACKLIGHT_LEVELS + 1) / 2));
+    }
+}
+
+#endif
+
+void matrix_init_kb(void) {
+	// put your keyboard start-up code here
+	// runs once when the firmware starts up
+	if (matrix_init_user) {
+		(*matrix_init_user)();
+	}
+	led_init_ports();
+
+    #ifdef BACKLIGHT_ENABLE
+        backlight_init_ports();
+    #endif
+};
+
+void matrix_scan_kb(void) {
+	// put your looping keyboard code here
+	// runs every cycle (a lot)
+	if (matrix_scan_user) {
+		(*matrix_scan_user)();
+	}
+};