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dianjixz
64 lines
2.4 KiB
C
64 lines
2.4 KiB
C
#ifndef _LIB_I2C_H_
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#define _LIB_I2C_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/types.h>
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#include <linux/i2c.h>
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#include <linux/i2c-dev.h>
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// will have 4 ms delay!
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/* I2c device */
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typedef struct i2c_device {
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int bus; /* I2C Bus fd, return from i2c_open */
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unsigned short addr; /* I2C device(slave) address */
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unsigned char tenbit; /* I2C is 10 bit device address */
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unsigned char delay; /* I2C internal operation delay, unit millisecond */
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unsigned short flags; /* I2C i2c_ioctl_read/write flags */
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unsigned int page_bytes; /* I2C max number of bytes per page, 1K/2K 8, 4K/8K/16K 16, 32K/64K 32 etc */
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unsigned int iaddr_bytes; /* I2C device internal(word) address bytes, such as: 24C04 1 byte, 24C64 2 bytes */
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} LINUXI2CDevice;
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/* Close i2c bus */
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void linuxi2c_close(int bus);
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/* Open i2c bus, return i2c bus fd */
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int linuxi2c_open(const char *bus_name);
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/* Initialize I2CDevice with default value */
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void linuxi2c_init_device(LINUXI2CDevice *device);
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/* Get i2c device description */
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char *linuxi2c_get_device_desc(const LINUXI2CDevice *device, char *buf, size_t size);
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/* Select i2c device on i2c bus */
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int linuxi2c_select(int bus, unsigned long dev_addr, unsigned long tenbit);
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/* I2C internal(word) address convert */
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void linuxi2c_iaddr_convert(unsigned int int_addr, unsigned int iaddr_bytes, unsigned char *addr);
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/* I2C file I/O read, write */
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ssize_t linuxi2c_read(const LINUXI2CDevice *device, unsigned int iaddr, void *buf, size_t len);
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ssize_t linuxi2c_write(const LINUXI2CDevice *device, unsigned int iaddr, const void *buf, size_t len);
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/* I2c ioctl read, write can set i2c flags */
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ssize_t linuxi2c_ioctl_read(const LINUXI2CDevice *device, unsigned int iaddr, void *buf, size_t len);
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ssize_t linuxi2c_ioctl_write(const LINUXI2CDevice *device, unsigned int iaddr, const void *buf, size_t len);
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/* I2c primitive read, write can set i2c flags */
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ssize_t linuxi2c_primitive_read(const LINUXI2CDevice *device, void *offset, size_t offset_len, void *buf, size_t buf_len);
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ssize_t linuxi2c_primitive_write(const LINUXI2CDevice *device, void *offset, size_t offset_len, void *buf, size_t buf_len);
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/* I2C read / write handle function */
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typedef ssize_t (*LINUXI2C_READ_HANDLE)(const LINUXI2CDevice *dev, unsigned int iaddr, void *buf, size_t len);
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typedef ssize_t (*LINUXI2C_WRITE_HANDLE)(const LINUXI2CDevice *dev, unsigned int iaddr, const void *buf, size_t len);
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#ifdef __cplusplus
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}
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#endif
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#endif
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