1 #ifndef _LINUX_ETRAXI2C_H
2 #define _LINUX_ETRAXI2C_H
4 /* etraxi2c _IOC_TYPE, bits 8 to 15 in ioctl cmd */
6 #define ETRAXI2C_IOCTYPE 44
8 /* supported ioctl _IOC_NR's */
10 /* in write operations, the argument contains both i2c
11 * slave, register and value.
14 #define I2C_WRITEARG(slave, reg, value) (((slave) << 16) | ((reg) << 8) | (value))
15 #define I2C_READARG(slave, reg) (((slave) << 16) | ((reg) << 8))
17 #define I2C_ARGSLAVE(arg) ((arg) >> 16)
18 #define I2C_ARGREG(arg) (((arg) >> 8) & 0xff)
19 #define I2C_ARGVALUE(arg) ((arg) & 0xff)
21 #define I2C_WRITEREG 0x1 /* write to an I2C register */
22 #define I2C_READREG 0x2 /* read from an I2C register */
27 i2c_arg = I2C_WRITEARG(STA013_WRITE_ADDR, reg, val);
28 ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_WRITEREG), i2c_arg);
30 i2c_arg = I2C_READARG(STA013_READ_ADDR, reg);
31 val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg);
36 #define I2C_READ 0x4 /* reads from I2C device */
37 #define I2C_WRITE 0x3 /* writes to I2C device */
38 #define I2C_WRITEREAD 0x5 /* writes to I2C device where to start reading */
40 typedef struct _I2C_DATA
42 unsigned char slave
; /* I2C address (8-bit representation) of slave device */
43 unsigned char wbuf
[256]; /* Write buffer (length = 256 bytes) */
44 unsigned int wlen
; /* Number of bytes to write from wbuf[] */
45 unsigned char rbuf
[256]; /* Read buffer (length = 256 bytes) */
46 unsigned int rlen
; /* Number of bytes to read into rbuf[] */
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