+/*
+ * Register I/O map
+ */
+#define S526_TIMER_REG 0x00
+#define S526_TIMER_LOAD(x) (((x) & 0xff) << 8)
+#define S526_TIMER_MODE ((x) << 1)
+#define S526_TIMER_MANUAL S526_TIMER_MODE(0)
+#define S526_TIMER_AUTO S526_TIMER_MODE(1)
+#define S526_TIMER_RESTART BIT(0)
+#define S526_WDOG_REG 0x02
+#define S526_WDOG_INVERTED BIT(4)
+#define S526_WDOG_ENA BIT(3)
+#define S526_WDOG_INTERVAL(x) (((x) & 0x7) << 0)
+#define S526_AO_CTRL_REG 0x04
+#define S526_AO_CTRL_RESET BIT(3)
+#define S526_AO_CTRL_CHAN(x) (((x) & 0x3) << 1)
+#define S526_AO_CTRL_START BIT(0)
+#define S526_AI_CTRL_REG 0x06
+#define S526_AI_CTRL_DELAY BIT(15)
+#define S526_AI_CTRL_CONV(x) (1 << (5 + ((x) & 0x9)))
+#define S526_AI_CTRL_READ(x) (((x) & 0xf) << 1)
+#define S526_AI_CTRL_START BIT(0)
+#define S526_AO_REG 0x08
+#define S526_AI_REG 0x08
+#define S526_DIO_CTRL_REG 0x0a
+#define S526_DIO_CTRL_DIO3_NEG BIT(15) /* irq on DIO3 neg/pos edge */
+#define S526_DIO_CTRL_DIO2_NEG BIT(14) /* irq on DIO2 neg/pos edge */
+#define S526_DIO_CTRL_DIO1_NEG BIT(13) /* irq on DIO1 neg/pos edge */
+#define S526_DIO_CTRL_DIO0_NEG BIT(12) /* irq on DIO0 neg/pos edge */
+#define S526_DIO_CTRL_GRP2_OUT BIT(11)
+#define S526_DIO_CTRL_GRP1_OUT BIT(10)
+#define S526_DIO_CTRL_GRP2_NEG BIT(8) /* irq on DIO[4-7] neg/pos edge */
+#define S526_INT_ENA_REG 0x0c
+#define S526_INT_STATUS_REG 0x0e
+#define S526_INT_DIO(x) BIT(8 + ((x) & 0x7))
+#define S526_INT_EEPROM BIT(7) /* status only */
+#define S526_INT_CNTR(x) BIT(3 + (3 - ((x) & 0x3)))
+#define S526_INT_AI BIT(2)
+#define S526_INT_AO BIT(1)
+#define S526_INT_TIMER BIT(0)
+#define S526_MISC_REG 0x10
+#define S526_MISC_LED_OFF BIT(0)
+#define S526_GPCT_LSB_REG(x) (0x12 + ((x) * 8))
+#define S526_GPCT_MSB_REG(x) (0x14 + ((x) * 8))
+#define S526_GPCT_MODE_REG(x) (0x16 + ((x) * 8))
+#define S526_GPCT_CTRL_REG(x) (0x18 + ((x) * 8))
+#define S526_EEPROM_DATA_REG 0x32
+#define S526_EEPROM_CTRL_REG 0x34
+#define S526_EEPROM_CTRL_ADDR(x) (((x) & 0x3f) << 3)
+#define S526_EEPROM_CTRL(x) (((x) & 0x3) << 1)
+#define S526_EEPROM_CTRL_READ S526_EEPROM_CTRL(2)
+#define S526_EEPROM_CTRL_START BIT(0)