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2007-11-20 Till Straumann <strauman@slac.stanford.edu>

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* libchip/rtc/ds1375.c, libchip/rtc/ds1375-rtc.h:
	Avoid using 'stdio' before the system is up and fully
	initialized.
This commit is contained in:
Till Straumann
2007-11-21 06:23:12 +00:00
parent d2ff24c22d
commit d371a97e58
3 changed files with 33 additions and 3 deletions
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6
c/src/ChangeLog
View File

@@ -1,3 +1,9 @@
2007-11-20 Till Straumann <strauman@slac.stanford.edu>
* libchip/rtc/ds1375.c, libchip/rtc/ds1375-rtc.h:
Avoid using 'stdio' before the system is up and fully
initialized.
2007-11-20 Till Straumann <strauman@slac.stanford.edu>
* libchip/rtc/ds1375.c, libchip/rtc/ds1375-rtc.h,

7
c/src/libchip/rtc/ds1375-rtc.h
View File

@@ -71,6 +71,13 @@ rtc_ds1375_set_register( uint32_t port, uint8_t reg, uint32_t value );
* BSP must supply string constant argument 'i2cname' which matches
* the registered device name of the raw i2c device (created with mknod).
* E.g., "/dev/i2c.ds1375-raw"
*
* NOTE: The i2c bus driver must already be up and 'i2cname' already
* be available when this ENTRY is registered or initialized.
*
* If you want to allow applications to add the RTC driver to
* the configuration table then the i2c subsystem must be
* initialized by the BSP from the predriver_hook.
*/
#define DS1375_RTC_TBL_ENTRY(i2cname) \
{ \

23
c/src/libchip/rtc/ds1375.c
View File

@@ -54,6 +54,7 @@
#include <libchip/ds1375-rtc.h>
#include <sys/fcntl.h>
#include <sys/errno.h>
#include <stdio.h>
#include <inttypes.h>
@@ -61,6 +62,22 @@
#define STATIC static
#undef DEBUG
/* The RTC driver routines are possibly called during
* system initialization -- that would be prior to opening
* the console. At this point it is not safe to use stdio
* (printf, perror etc.).
* Our file descriptors may even be 0..2
*/
#define STDIOSAFE(fmt,args...) \
do { \
if ( _System_state_Is_up( _System_state_Get() ) ) { \
fprintf(stderr,fmt,args); \
} else { \
printk(fmt,args); \
} \
} while (0)
STATIC uint8_t ds1375_bcd2bin(uint8_t x)
{
uint8_t h = x & 0xf0;
@@ -399,19 +416,19 @@ rtc_ds1375_device_probe( int minor )
int fd;
if ( ( fd = getfd( minor ) ) < 0 ) {
perror("ds1375_probe (open)");
STDIOSAFE( "ds1375_probe (open): %s\n", strerror( errno ) );
return FALSE;
}
/* Try to set file pointer */
if ( 0 != wr_bytes( fd, DS1375_SEC_REG, 0, 0 ) ) {
perror( "ds1375_probe (wr_bytes)" );
STDIOSAFE( "ds1375_probe (wr_bytes): %s\n", strerror( errno ) );
close( fd );
return FALSE;
}
if ( close( fd ) ) {
perror( "ds1375_probe (close)" );
STDIOSAFE( "ds1375_probe (close): %s\n", strerror( errno ) );
return FALSE;
}