cregit-Linux how code gets into the kernel

Release 4.7 include/linux/i2c-algo-pca.h

Directory: include/linux
#ifndef _LINUX_I2C_ALGO_PCA_H

#define _LINUX_I2C_ALGO_PCA_H

/* Chips known to the pca algo */

#define I2C_PCA_CHIP_9564	0x00

#define I2C_PCA_CHIP_9665	0x01

/* Internal period for PCA9665 oscilator */

#define I2C_PCA_OSC_PER		3 
/* e10-8s */

/* Clock speeds for the bus for PCA9564*/

#define I2C_PCA_CON_330kHz	0x00

#define I2C_PCA_CON_288kHz	0x01

#define I2C_PCA_CON_217kHz	0x02

#define I2C_PCA_CON_146kHz	0x03

#define I2C_PCA_CON_88kHz	0x04

#define I2C_PCA_CON_59kHz	0x05

#define I2C_PCA_CON_44kHz	0x06

#define I2C_PCA_CON_36kHz	0x07

/* PCA9564 registers */

#define I2C_PCA_STA		0x00 
/* STATUS  Read Only  */

#define I2C_PCA_TO		0x00 
/* TIMEOUT Write Only */

#define I2C_PCA_DAT		0x01 
/* DATA    Read/Write */

#define I2C_PCA_ADR		0x02 
/* OWN ADR Read/Write */

#define I2C_PCA_CON		0x03 
/* CONTROL Read/Write */

/* PCA9665 registers */

#define I2C_PCA_INDPTR          0x00 
/* INDIRECT Pointer Write Only */

#define I2C_PCA_IND             0x02 
/* INDIRECT Read/Write */

/* PCA9665 indirect registers */

#define I2C_PCA_ICOUNT          0x00 
/* Byte Count for buffered mode */

#define I2C_PCA_IADR            0x01 
/* OWN ADR */

#define I2C_PCA_ISCLL           0x02 
/* SCL LOW period */

#define I2C_PCA_ISCLH           0x03 
/* SCL HIGH period */

#define I2C_PCA_ITO             0x04 
/* TIMEOUT */

#define I2C_PCA_IPRESET         0x05 
/* Parallel bus reset */

#define I2C_PCA_IMODE           0x06 
/* I2C Bus mode */

/* PCA9665 I2C bus mode */

#define I2C_PCA_MODE_STD        0x00 
/* Standard mode */

#define I2C_PCA_MODE_FAST       0x01 
/* Fast mode */

#define I2C_PCA_MODE_FASTP      0x02 
/* Fast Plus mode */

#define I2C_PCA_MODE_TURBO      0x03 
/* Turbo mode */



#define I2C_PCA_CON_AA		0x80 
/* Assert Acknowledge */

#define I2C_PCA_CON_ENSIO	0x40 
/* Enable */

#define I2C_PCA_CON_STA		0x20 
/* Start */

#define I2C_PCA_CON_STO		0x10 
/* Stop */

#define I2C_PCA_CON_SI		0x08 
/* Serial Interrupt */

#define I2C_PCA_CON_CR		0x07 
/* Clock Rate (MASK) */


struct i2c_algo_pca_data {
	
void 				*data;	/* private low level data */
	
void (*write_byte)		(void *data, int reg, int val);
	
int  (*read_byte)		(void *data, int reg);
	
int  (*wait_for_completion)	(void *data);
	
void (*reset_chip)		(void *data);
	/* For PCA9564, use one of the predefined frequencies:
         * 330000, 288000, 217000, 146000, 88000, 59000, 44000, 36000
         * For PCA9665, use the frequency you want here. */
	
unsigned int			i2c_clock;
	
unsigned int			chip;
};

int i2c_pca_add_bus(struct i2c_adapter *);
int i2c_pca_add_numbered_bus(struct i2c_adapter *);

#endif /* _LINUX_I2C_ALGO_PCA_H */

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Directory: include/linux
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