| 1 | #ifndef _LINUX_ETRAXI2C_H |
| 2 | #define _LINUX_ETRAXI2C_H |
| 3 | |
| 4 | /* etraxi2c _IOC_TYPE, bits 8 to 15 in ioctl cmd */ |
| 5 | |
| 6 | #define ETRAXI2C_IOCTYPE 44 |
| 7 | |
| 8 | /* supported ioctl _IOC_NR's */ |
| 9 | |
| 10 | /* in write operations, the argument contains both i2c |
| 11 | * slave, register and value. |
| 12 | */ |
| 13 | |
| 14 | #define I2C_WRITEARG(slave, reg, value) (((slave) << 16) | ((reg) << 8) | (value)) |
| 15 | #define I2C_READARG(slave, reg) (((slave) << 16) | ((reg) << 8)) |
| 16 | |
| 17 | #define I2C_ARGSLAVE(arg) ((arg) >> 16) |
| 18 | #define I2C_ARGREG(arg) (((arg) >> 8) & 0xff) |
| 19 | #define I2C_ARGVALUE(arg) ((arg) & 0xff) |
| 20 | |
| 21 | #define I2C_WRITEREG 0x1 /* write to an I2C register */ |
| 22 | #define I2C_READREG 0x2 /* read from an I2C register */ |
| 23 | |
| 24 | /* |
| 25 | EXAMPLE usage: |
| 26 | |
| 27 | i2c_arg = I2C_WRITEARG(STA013_WRITE_ADDR, reg, val); |
| 28 | ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_WRITEREG), i2c_arg); |
| 29 | |
| 30 | i2c_arg = I2C_READARG(STA013_READ_ADDR, reg); |
| 31 | val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg); |
| 32 | |
| 33 | */ |
| 34 | |
| 35 | /* Extended part */ |
| 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 */ |
| 39 | |
| 40 | typedef struct _I2C_DATA |
| 41 | { |
| 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[] */ |
| 47 | } I2C_DATA; |
| 48 | |
| 49 | #endif |
| 50 | |
