target/linux/etrax/files/arch/cris/arch-v10/drivers/etraxi2c.h

   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