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/* $Id$ */
/* Register i2c bus driver & devices */
/*
* Authorship
* ----------
* This software ('mvme3100' RTEMS BSP) was created by
*
* Till Straumann <strauman@slac.stanford.edu>, 2005-2007,
* Stanford Linear Accelerator Center, Stanford University.
*
* Acknowledgement of sponsorship
* ------------------------------
* The 'mvme3100' BSP was produced by
* the Stanford Linear Accelerator Center, Stanford University,
* under Contract DE-AC03-76SFO0515 with the Department of Energy.
*
* Government disclaimer of liability
* ----------------------------------
* Neither the United States nor the United States Department of Energy,
* nor any of their employees, makes any warranty, express or implied, or
* assumes any legal liability or responsibility for the accuracy,
* completeness, or usefulness of any data, apparatus, product, or process
* disclosed, or represents that its use would not infringe privately owned
* rights.
*
* Stanford disclaimer of liability
* --------------------------------
* Stanford University makes no representations or warranties, express or
* implied, nor assumes any liability for the use of this software.
*
* Stanford disclaimer of copyright
* --------------------------------
* Stanford University, owner of the copyright, hereby disclaims its
* copyright and all other rights in this software. Hence, anyone may
* freely use it for any purpose without restriction.
*
* Maintenance of notices
* ----------------------
* In the interest of clarity regarding the origin and status of this
* SLAC software, this and all the preceding Stanford University notices
* are to remain affixed to any copy or derivative of this software made
* or distributed by the recipient and are to be affixed to any copy of
* software made or distributed by the recipient that contains a copy or
* derivative of this software.
*
* ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03
*/
#include <rtems.h>
#include <bsp.h>
#include <rtems/bspIo.h>
#include <rtems/libi2c.h>
#include <libchip/i2c-2b-eeprom.h>
#include <libchip/i2c-ds1621.h>
#include <bsp/mpc8540_i2c_busdrv.h>
#include <rtems/libio.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <stdarg.h>
static void
safe_printf (const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if ( _System_state_Is_up( _System_state_Get() ) )
vfprintf( stderr, fmt, ap );
else
vprintk( fmt, ap );
va_end(ap);
}
static void
safe_perror(const char *s)
{
safe_printf("%s :%s\n", s, strerror(errno));
}
int
BSP_i2c_initialize()
{
int busno, succ = 0;
/* Initialize the library */
if ( rtems_libi2c_initialize() ) {
safe_printf("Initializing I2C library failed\n");
return -1;
}
/* Register our bus driver */
if ( (busno=rtems_libi2c_register_bus(
BSP_I2C_BUS0_NAME,
BSP_I2C_BUS_DESCRIPTOR) ) < 0 ) {
safe_perror("Registering mpc8540 i2c bus driver");
return -1;
}
/* Now register higher level drivers; note that
* the i2c address in the manual is actually left-shifted
* by one bit, i.e., as it would go on the bus.
*/
/* Use read-only driver for VPD */
if ( rtems_libi2c_register_drv(
BSP_I2C_VPD_EEPROM_NAME,
i2c_2b_eeprom_ro_driver_descriptor,
busno,
BSP_VPD_I2C_ADDR) < 0 ) {
safe_perror("Registering i2c VPD eeprom driver failed");
} else {
succ++;
}
/* Use read-write driver for user eeprom -- you still might
* have to disable HW write-protection on your board.
*/
if ( rtems_libi2c_register_drv(
BSP_I2C_USR_EEPROM_NAME,
i2c_2b_eeprom_driver_descriptor,
busno,
BSP_USR0_I2C_ADDR) < 0 ) {
safe_perror("Registering i2c 1st USR eeprom driver failed");
} else {
succ++;
}
/* Use read-write driver for user eeprom -- you still might
* have to disable HW write-protection on your board.
*/
if ( rtems_libi2c_register_drv(
BSP_I2C_USR1_EEPROM_NAME,
i2c_2b_eeprom_driver_descriptor,
busno,
BSP_USR1_I2C_ADDR) < 0 ) {
safe_perror("Registering i2c 2nd USR eeprom driver failed");
} else {
succ++;
}
/* The thermostat */
if ( rtems_libi2c_register_drv(
BSP_I2C_DS1621_NAME,
i2c_ds1621_driver_descriptor,
busno,
BSP_THM_I2C_ADDR) < 0 ) {
safe_perror("Registering i2c ds1621 temp sensor. driver failed");
} else {
succ++;
}
/* Finally, as an example, register raw access to the
* ds1621. The driver above just reads the 8 msb of the
* temperature but doesn't support anything else. Using
* the raw device node you can write/read individual
* control bytes yourself and e.g., program the thermostat...
*/
if ( mknod(
BSP_I2C_DS1621_RAW_DEV_NAME,
0666 | S_IFCHR,
rtems_filesystem_make_dev_t(rtems_libi2c_major,
RTEMS_LIBI2C_MAKE_MINOR(busno,BSP_THM_I2C_ADDR))) ) {
safe_perror("Creating device node for raw ds1621 (temp. sensor) access failed");
} else {
succ++;
}
/* Raw access to RTC */
if ( mknod(
BSP_I2C_DS1375_RAW_DEV_NAME,
0666 | S_IFCHR,
rtems_filesystem_make_dev_t(rtems_libi2c_major,
RTEMS_LIBI2C_MAKE_MINOR(busno,BSP_RTC_I2C_ADDR))) ) {
safe_perror("Creating device node for raw ds1375 (rtc) access failed");
} else {
succ++;
}
safe_printf("%i I2C devices registered\n", succ);
return 0;
}
|
