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mirror of git://projects.qi-hardware.com/openwrt-xburst.git synced 2024-12-26 00:05:31 +02:00

Add i2c driver (to etrax) improved by Geert Vancompernolle

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@14462 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
claudio 2009-02-09 21:38:27 +00:00
parent 75d621a3c5
commit 85a0242c71
5 changed files with 1461 additions and 0 deletions

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#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

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#ifndef _I2C_ERRNO_H
#define _I2C_ERRNO_H
#define EI2CNOERRORS 0 /* All fine */
#define EI2CBUSNFREE 1 /* I2C bus not free */
#define EI2CWADDRESS 2 /* Address write failed */
#define EI2CRADDRESS 3 /* Address read failed */
#define EI2CSENDDATA 4 /* Sending data failed */
#define EI2CRECVDATA 5 /* Receiving data failed */
#define EI2CSTRTCOND 6 /* Start condition failed */
#define EI2CRSTACOND 7 /* Repeated start condition failed */
#define EI2CSTOPCOND 8 /* Stop condition failed */
#define EI2CNOSNDBYT 9 /* Number of send bytes is 0, while there's a send buffer defined */
#define EI2CNOSNDBUF 10 /* No send buffer defined, while number of send bytes is not 0 */
#define EI2CNORCVBYT 11 /* Number of receive bytes is 0, while there's a receive buffer defined */
#define EI2CNORCVBUF 12 /* No receive buffer defined, while number of receive bytes is not 0 */
#define EI2CNOACKNLD 13 /* No acknowledge received from slave */
#define EI2CNOMNUMBR 14 /* No MAJOR number received from kernel while registering the device */
#endif /* _I2C_ERRNO_H */

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/* $Id: i2c.h,v 1.3 2004/05/28 09:26:59 starvik Exp $ */
#ifndef _I2C_H
#define _I2C_H
int i2c_init(void);
/* High level I2C actions */
int i2c_writereg(unsigned char theSlave, unsigned char theReg, unsigned char theValue);
unsigned char i2c_readreg(unsigned char theSlave, unsigned char theReg);
/* Low level I2C */
int i2c_start(void);
int i2c_stop(void);
int i2c_outbyte(unsigned char x);
unsigned char i2c_inbyte(void);
int i2c_getack(void);
void i2c_sendack(void);
void i2c_sendnack(void);
/**GVC**/
/* New low level I2C functions */
int i2c_read( unsigned char slave, unsigned char* rbuf, unsigned char rlen );
int i2c_write( unsigned char slave, unsigned char* wbuf, unsigned char wlen );
int i2c_writeread( unsigned char slave
, unsigned char* wbuf
, unsigned char wlen
, unsigned char* rbuf
, unsigned char rlen
);
/**END GVC**/
#endif /* _I2C_H */

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Index: linux-2.6.25.20/arch/cris/arch-v10/drivers/Kconfig
===================================================================
--- linux-2.6.25.20.orig/arch/cris/arch-v10/drivers/Kconfig 2009-02-09 09:30:40.000000000 +0100
+++ linux-2.6.25.20/arch/cris/arch-v10/drivers/Kconfig 2009-02-09 21:23:12.000000000 +0100
@@ -450,11 +450,18 @@
i2c_arg = I2C_READARG(STA013_READ_ADDR, reg);
val = ioctl(fd, _IO(ETRAXI2C_IOCTYPE, I2C_READREG), i2c_arg);
+config ETRAX_I2C_GVC
+ bool "I2C GVC support"
+ depends on ETRAX_ARCH_V10 && !ETRAX_I2C
+ select ETRAX_I2C_USES_PB_NOT_PB_I2C
+ help
+ Enables an I2C driver with Geert Vancompernolle improvement.
+
# this is true for most products since PB-I2C seems to be somewhat
# flawed..
config ETRAX_I2C_USES_PB_NOT_PB_I2C
bool "I2C uses PB not PB-I2C"
- depends on ETRAX_I2C
+ depends on ETRAX_I2C || ETRAX_I2C_GVC
help
Select whether to use the special I2C mode in the PB I/O register or
not. This option needs to be selected in order to use some drivers
@@ -478,7 +485,7 @@
config ETRAX_I2C_EEPROM
bool "I2C EEPROM (non-volatile RAM) support"
- depends on ETRAX_I2C
+ depends on ETRAX_I2C || ETRAX_I2C_GVC
help
Enables I2C EEPROM (non-volatile RAM) on PB0 and PB1 using the I2C
driver. Select size option: Probed, 2k, 8k, 16k.
Index: linux-2.6.25.20/arch/cris/arch-v10/drivers/Makefile
===================================================================
--- linux-2.6.25.20.orig/arch/cris/arch-v10/drivers/Makefile 2009-02-09 09:30:41.000000000 +0100
+++ linux-2.6.25.20/arch/cris/arch-v10/drivers/Makefile 2009-02-09 09:35:39.000000000 +0100
@@ -4,6 +4,7 @@
obj-$(CONFIG_ETRAX_AXISFLASHMAP) += axisflashmap.o
obj-$(CONFIG_ETRAX_I2C) += i2c.o
+obj-$(CONFIG_ETRAX_I2C_GVC) += i2c_gvc.o
obj-$(CONFIG_ETRAX_I2C_EEPROM) += eeprom.o
obj-$(CONFIG_ETRAX_GPIO) += gpio.o
obj-$(CONFIG_ETRAX_DS1302) += ds1302.o