drivers/i2c/algos/i2c-algo-pcf.h

Source file repositories/reference/linux-study-clean/drivers/i2c/algos/i2c-algo-pcf.h

File Facts

System
Linux kernel
Corpus path
drivers/i2c/algos/i2c-algo-pcf.h
Extension
.h
Size
2204 bytes
Lines
66
Domain
Driver Families
Bucket
drivers/i2c
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

1999 Hans Berglund

 */
/* --------------------------------------------------------------------	*/

/* With some changes from Frodo Looijaard <frodol@dds.nl> */

#ifndef I2C_PCF8584_H
#define I2C_PCF8584_H 1

/* ----- Control register bits ----------------------------------------	*/
#define I2C_PCF_PIN	0x80
#define I2C_PCF_ESO	0x40
#define I2C_PCF_ES1	0x20
#define I2C_PCF_ES2	0x10
#define I2C_PCF_ENI	0x08
#define I2C_PCF_STA	0x04
#define I2C_PCF_STO	0x02
#define I2C_PCF_ACK	0x01

#define I2C_PCF_START    (I2C_PCF_PIN | I2C_PCF_ESO | I2C_PCF_STA | I2C_PCF_ACK)
#define I2C_PCF_STOP     (I2C_PCF_PIN | I2C_PCF_ESO | I2C_PCF_STO | I2C_PCF_ACK)
#define I2C_PCF_REPSTART (              I2C_PCF_ESO | I2C_PCF_STA | I2C_PCF_ACK)
#define I2C_PCF_IDLE     (I2C_PCF_PIN | I2C_PCF_ESO               | I2C_PCF_ACK)

/* ----- Status register bits -----------------------------------------	*/
/*#define I2C_PCF_PIN  0x80    as above*/

#define I2C_PCF_INI 0x40   /* 1 if not initialized */
#define I2C_PCF_STS 0x20
#define I2C_PCF_BER 0x10
#define I2C_PCF_AD0 0x08
#define I2C_PCF_LRB 0x08
#define I2C_PCF_AAS 0x04
#define I2C_PCF_LAB 0x02
#define I2C_PCF_BB  0x01

/* ----- Chip clock frequencies ---------------------------------------	*/
#define I2C_PCF_CLK3	0x00
#define I2C_PCF_CLK443	0x10
#define I2C_PCF_CLK6	0x14
#define I2C_PCF_CLK	0x18
#define I2C_PCF_CLK12	0x1c

/* ----- transmission frequencies -------------------------------------	*/
#define I2C_PCF_TRNS90 0x00	/*  90 kHz */
#define I2C_PCF_TRNS45 0x01	/*  45 kHz */
#define I2C_PCF_TRNS11 0x02	/*  11 kHz */
#define I2C_PCF_TRNS15 0x03	/* 1.5 kHz */


/* ----- Access to internal registers according to ES1,ES2 ------------	*/
/* they are mapped to the data port ( a0 = 0 ) 				*/
/* available when ESO == 0 :						*/

#define I2C_PCF_OWNADR	0
#define I2C_PCF_INTREG	I2C_PCF_ES2
#define I2C_PCF_CLKREG	I2C_PCF_ES1

#endif /* I2C_PCF8584_H */

Annotation

Implementation Notes