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      1 /*	$NetBSD: pcf8584reg.h,v 1.3 2025/01/05 22:11:18 andvar Exp $ */
      2 
      3 /* Written by Tobias Nygren. Released into the public domain. */
      4 
      5 /* SCL clock frequency */
      6 #define	PCF8584_SCL_90		0 	/* 90 kHz */
      7 #define	PCF8584_SCL_45		1 	/* 45 kHz */
      8 #define	PCF8584_SCL_11		2	/* 11 kHz */
      9 #define	PCF8584_SCL_1_5		3	/* 1.5 kHz */
     10 
     11 /* Internal clock frequency */
     12 #define	PCF8584_CLK_3		0	/* 3 MHz */
     13 #define	PCF8584_CLK_4_43	0x10	/* 4.43 MHz */
     14 #define	PCF8584_CLK_6		0x14	/* 6 MHz */
     15 #define	PCF8584_CLK_8		0x18	/* 8 MHz */
     16 #define	PCF8584_CLK_12		0x1C	/* 12 MHz */
     17 
     18 /* Control register bits (write only) */
     19 #define	PCF8584_CTRL_ACK	(1<<0)	/* send ACK */
     20 #define	PCF8584_CTRL_STO	(1<<1)	/* send STOP */
     21 #define	PCF8584_CTRL_STA	(1<<2)	/* send START */
     22 #define	PCF8584_CTRL_ENI	(1<<3)	/* Enable Interrupt */
     23 #define	PCF8584_CTRL_ES2	(1<<4)	/* alternate register selection */
     24 #define	PCF8584_CTRL_ES1	(1<<5)	/* alternate register selection */
     25 #define	PCF8584_CTRL_ESO	(1<<6)	/* Enable Serial Output */
     26 #define	PCF8584_CTRL_PIN	(1<<7)	/* Pending Interrupt Not */
     27 
     28 /* Status register bits (read only) */
     29 #define	PCF8584_STATUS_BBN	(1<<0)	/* Bus Busy Not */
     30 #define	PCF8584_STATUS_LAB	(1<<1)	/* Lost Arbitration */
     31 #define	PCF8584_STATUS_AAS	(1<<2)	/* Addressed As Slave */
     32 #define	PCF8584_STATUS_LRB	(1<<3)	/* Last Received Bit (NAK+bcast det.) */
     33 #define	PCF8584_STATUS_BER	(1<<4)	/* Bus error */
     34 #define	PCF8584_STATUS_STS	(1<<5)	/* external STOP condition detected */
     35 #define	PCF8584_STATUS_INI	(1<<6)	/* 0 if initialized */
     36 #define	PCF8584_STATUS_PIN	(1<<7)	/* Pending Interrupt Not */
     37 
     38 #define	PCF8584_REG_S0_		0			/* S0' own address */
     39 #define	PCF8584_REG_S2		PCF8584_CTRL_ES1	/* clock register */
     40 #define	PCF8584_REG_S3		PCF8584_CTRL_ES2	/* Interrupt vector */
     41 
     42 #define PCF8584_CMD_START	(PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
     43     PCF8584_CTRL_STA | PCF8584_CTRL_ACK)
     44 #define PCF8584_CMD_STOP	(PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
     45     PCF8584_CTRL_STO | PCF8584_CTRL_ACK)
     46 #define PCF8584_CMD_REPSTART    (PCF8584_CTRL_ESO | PCF8584_CTRL_STA | \
     47     PCF8584_CTRL_ACK)
     48 #define PCF8584_CMD_IDLE        (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
     49     PCF8584_CTRL_ACK)
     50 #define PCF8584_CMD_NAK (PCF8584_CTRL_ESO)
     51