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author | Claudio Mignanti <c.mignanti@gmail.com> | 2009-02-09 21:38:27 +0000 |
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committer | Claudio Mignanti <c.mignanti@gmail.com> | 2009-02-09 21:38:27 +0000 |
commit | 8708c1f09228d56d9fa0b698765102a3160674b2 (patch) | |
tree | dc8f7dfe2a6aede9510f6af40b446439b80f13f5 /target/linux/etrax/files/arch/cris/arch-v10/drivers/etraxi2c.h | |
parent | e5c9f0063792ad3d3945de1f33173b2ef82bae0d (diff) | |
download | master-31e0f0ae-8708c1f09228d56d9fa0b698765102a3160674b2.tar.gz master-31e0f0ae-8708c1f09228d56d9fa0b698765102a3160674b2.tar.bz2 master-31e0f0ae-8708c1f09228d56d9fa0b698765102a3160674b2.zip |
Add i2c driver (to etrax) improved by Geert Vancompernolle
SVN-Revision: 14462
Diffstat (limited to 'target/linux/etrax/files/arch/cris/arch-v10/drivers/etraxi2c.h')
-rw-r--r-- | target/linux/etrax/files/arch/cris/arch-v10/drivers/etraxi2c.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/target/linux/etrax/files/arch/cris/arch-v10/drivers/etraxi2c.h b/target/linux/etrax/files/arch/cris/arch-v10/drivers/etraxi2c.h new file mode 100644 index 0000000000..9d5c9bf951 --- /dev/null +++ b/target/linux/etrax/files/arch/cris/arch-v10/drivers/etraxi2c.h @@ -0,0 +1,49 @@ +#ifndef _LINUX_ETRAXI2C_H +#define _LINUX_ETRAXI2C_H + +/* etraxi2c _IOC_TYPE, bits 8 to 15 in ioctl cmd */ + +#define ETRAXI2C_IOCTYPE 44 + +/* supported ioctl _IOC_NR's */ + +/* in write operations, the argument contains both i2c + * slave, register and value. + */ + +#define I2C_WRITEARG(slave, reg, value) (((slave) << 16) | ((reg) << 8) | (value)) +#define I2C_READARG(slave, reg) (((slave) << 16) | ((reg) << 8)) + +#define I2C_ARGSLAVE(arg) ((arg) >> 16) +#define I2C_ARGREG(arg) (((arg) >> 8) & 0xff) +#define I2C_ARGVALUE(arg) ((arg) & 0xff) + +#define I2C_WRITEREG 0x1 /* write to an I2C register */ +#define I2C_READREG 0x2 /* read from an I2C register */ + +/* +EXAMPLE usage: + + i2c_arg = I2C_WRITEARG(STA013_WRITE_ADDR, reg, val); + ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_WRITEREG), i2c_arg); + + i2c_arg = I2C_READARG(STA013_READ_ADDR, reg); + val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg); + +*/ + +/* Extended part */ +#define I2C_READ 0x4 /* reads from I2C device */ +#define I2C_WRITE 0x3 /* writes to I2C device */ +#define I2C_WRITEREAD 0x5 /* writes to I2C device where to start reading */ + +typedef struct _I2C_DATA +{ + unsigned char slave; /* I2C address (8-bit representation) of slave device */ + unsigned char wbuf[256]; /* Write buffer (length = 256 bytes) */ + unsigned int wlen; /* Number of bytes to write from wbuf[] */ + unsigned char rbuf[256]; /* Read buffer (length = 256 bytes) */ + unsigned int rlen; /* Number of bytes to read into rbuf[] */ +} I2C_DATA; + +#endif |