| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: etraxi2c.h,v 1.1 2001/01/18 15:49:57 bjornw Exp $ */ |
| 2 | |
| 3 | #ifndef _LINUX_ETRAXI2C_H |
| 4 | #define _LINUX_ETRAXI2C_H |
| 5 | |
| 6 | /* etraxi2c _IOC_TYPE, bits 8 to 15 in ioctl cmd */ |
| 7 | |
| 8 | #define ETRAXI2C_IOCTYPE 44 |
| 9 | |
| 10 | /* supported ioctl _IOC_NR's */ |
| 11 | |
| 12 | /* in write operations, the argument contains both i2c |
| 13 | * slave, register and value. |
| 14 | */ |
| 15 | |
| 16 | #define I2C_WRITEARG(slave, reg, value) (((slave) << 16) | ((reg) << 8) | (value)) |
| 17 | #define I2C_READARG(slave, reg) (((slave) << 16) | ((reg) << 8)) |
| 18 | |
| 19 | #define I2C_ARGSLAVE(arg) ((arg) >> 16) |
| 20 | #define I2C_ARGREG(arg) (((arg) >> 8) & 0xff) |
| 21 | #define I2C_ARGVALUE(arg) ((arg) & 0xff) |
| 22 | |
| 23 | #define I2C_WRITEREG 0x1 /* write to an i2c register */ |
| 24 | #define I2C_READREG 0x2 /* read from an i2c register */ |
| 25 | |
| 26 | /* |
| 27 | EXAMPLE usage: |
| 28 | |
| 29 | i2c_arg = I2C_WRITEARG(STA013_WRITE_ADDR, reg, val); |
| 30 | ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_WRITEREG), i2c_arg); |
| 31 | |
| 32 | i2c_arg = I2C_READARG(STA013_READ_ADDR, reg); |
| 33 | val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg); |
| 34 | |
| 35 | */ |
| 36 | #endif |