/* $NetBSD: pcf8584reg.h,v 1.3 2025/01/05 22:11:18 andvar Exp $ */
/* Written by Tobias Nygren. Released into the public domain. */
/* SCL clock frequency */
#define PCF8584_SCL_90 0 /* 90 kHz */
#define PCF8584_SCL_45 1 /* 45 kHz */
#define PCF8584_SCL_11 2 /* 11 kHz */
#define PCF8584_SCL_1_5 3 /* 1.5 kHz */
/* Internal clock frequency */
#define PCF8584_CLK_3 0 /* 3 MHz */
#define PCF8584_CLK_4_43 0x10 /* 4.43 MHz */
#define PCF8584_CLK_6 0x14 /* 6 MHz */
#define PCF8584_CLK_8 0x18 /* 8 MHz */
#define PCF8584_CLK_12 0x1C /* 12 MHz */
/* Control register bits (write only) */
#define PCF8584_CTRL_ACK (1<<0) /* send ACK */
#define PCF8584_CTRL_STO (1<<1) /* send STOP */
#define PCF8584_CTRL_STA (1<<2) /* send START */
#define PCF8584_CTRL_ENI (1<<3) /* Enable Interrupt */
#define PCF8584_CTRL_ES2 (1<<4) /* alternate register selection */
#define PCF8584_CTRL_ES1 (1<<5) /* alternate register selection */
#define PCF8584_CTRL_ESO (1<<6) /* Enable Serial Output */
#define PCF8584_CTRL_PIN (1<<7) /* Pending Interrupt Not */
/* Status register bits (read only) */
#define PCF8584_STATUS_BBN (1<<0) /* Bus Busy Not */
#define PCF8584_STATUS_LAB (1<<1) /* Lost Arbitration */
#define PCF8584_STATUS_AAS (1<<2) /* Addressed As Slave */
#define PCF8584_STATUS_LRB (1<<3) /* Last Received Bit (NAK+bcast det.) */
#define PCF8584_STATUS_BER (1<<4) /* Bus error */
#define PCF8584_STATUS_STS (1<<5) /* external STOP condition detected */
#define PCF8584_STATUS_INI (1<<6) /* 0 if initialized */
#define PCF8584_STATUS_PIN (1<<7) /* Pending Interrupt Not */
#define PCF8584_REG_S0_ 0 /* S0' own address */
#define PCF8584_REG_S2 PCF8584_CTRL_ES1 /* clock register */
#define PCF8584_REG_S3 PCF8584_CTRL_ES2 /* Interrupt vector */
#define PCF8584_CMD_START (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
PCF8584_CTRL_STA | PCF8584_CTRL_ACK)
#define PCF8584_CMD_STOP (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
PCF8584_CTRL_STO | PCF8584_CTRL_ACK)
#define PCF8584_CMD_REPSTART (PCF8584_CTRL_ESO | PCF8584_CTRL_STA | \
PCF8584_CTRL_ACK)
#define PCF8584_CMD_IDLE (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
PCF8584_CTRL_ACK)
#define PCF8584_CMD_NAK (PCF8584_CTRL_ESO)
