Add support for Meira

keyboards/meira/issi.h

@@ -0,0 +1,40 @@
+#ifdef ISSI_ENABLE
+#ifndef ISSI_H
+#define ISSI_H
+
+typedef struct ISSIDeviceStruct{
+    uint8_t fn_dirty;       // function registers need to be resent
+    uint8_t fn_device_addr;
+    uint8_t fn_register_addr;
+    uint8_t fn_registers[13];
+    uint8_t led_dirty;      // LED data has changed and needs to be resent
+    uint8_t led_device_addr;
+    uint8_t led_register_addr;
+    uint8_t led_ctrl[18];
+    uint8_t led_blink_ctrl[18];
+    uint8_t led_pwm[144];
+}ISSIDeviceStruct;
+
+extern ISSIDeviceStruct *issi_devices[];
+
+// Low level commands- 'device' is the 2-bit i2c id.
+void issi_init(void);
+void set_shutdown(uint8_t device, uint8_t shutdown);
+void writeRegister8(uint8_t device, uint8_t frame, uint8_t reg, uint8_t data);
+
+// Higher level, no device is given, but it is calculated from 'matrix'
+// Each device has 2 blocks, max of 4 devices:
+//  Device  |   Block   =   Matrix
+//    0           A           0
+//    0           B           1
+//    1           A           2
+//    1           B           3
+//    2           A           4
+//    2           B           5
+//    3           A           6
+//    3           B           7
+void activateLED(uint8_t matrix, uint8_t cx, uint8_t cy, uint8_t pwm);
+void update_issi(uint8_t device_addr, uint8_t blocking);
+
+#endif
+#endif