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[ARM] orion5x: ts78xx make more bulletproof the RTC load/unload code 

Added checks to the platform_device_(register|add) calls so that if
a device failed to load it would then not later be unloaded; also
added the hooks so that it would not try to unload when the RTC
driver support is compiled out.

Signed-off-by: Alexander Clouter <alex@digriz.org.uk>
Signed-off-by: Nicolas Pitre <nico@cam.org>
This commit is contained in:
Alexander Clouter 2009-02-23 22:37:36 +00:00 committed by Nicolas Pitre
parent f1f5465782
commit f5273fa310
1 changed files with 14 additions and 8 deletions
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22
arch/arm/mach-orion5x/ts78xx-setup.c
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@ -117,6 +117,7 @@ static struct platform_device ts78xx_ts_rtc_device = {
*/ */
static int ts78xx_ts_rtc_load(void) static int ts78xx_ts_rtc_load(void)
{ {
int rc;
unsigned char tmp_rtc0, tmp_rtc1; unsigned char tmp_rtc0, tmp_rtc1;
tmp_rtc0 = ts78xx_ts_rtc_readbyte(126); tmp_rtc0 = ts78xx_ts_rtc_readbyte(126);
@ -130,16 +131,18 @@ static int ts78xx_ts_rtc_load(void)
&& ts78xx_ts_rtc_readbyte(126) == 0x00) { && ts78xx_ts_rtc_readbyte(126) == 0x00) {
ts78xx_ts_rtc_writebyte(tmp_rtc0, 126); ts78xx_ts_rtc_writebyte(tmp_rtc0, 126);
ts78xx_ts_rtc_writebyte(tmp_rtc1, 127); ts78xx_ts_rtc_writebyte(tmp_rtc1, 127);
if (ts78xx_fpga.supports.ts_rtc.init == 0) { if (ts78xx_fpga.supports.ts_rtc.init == 0) {
ts78xx_fpga.supports.ts_rtc.init = 1; rc = platform_device_register(&ts78xx_ts_rtc_device);
platform_device_register(&ts78xx_ts_rtc_device); if (!rc)
ts78xx_fpga.supports.ts_rtc.init = 1;
} else } else
platform_device_add(&ts78xx_ts_rtc_device); rc = platform_device_add(&ts78xx_ts_rtc_device);
return 0;
return rc;
} }
} }
ts78xx_fpga.supports.ts_rtc.present = 0;
return -ENODEV; return -ENODEV;
}; };
@ -150,7 +153,7 @@ static void ts78xx_ts_rtc_unload(void)
#else #else
static int ts78xx_ts_rtc_load(void) static int ts78xx_ts_rtc_load(void)
{ {
return 0; return -ENODEV;
} }
static void ts78xx_ts_rtc_unload(void) static void ts78xx_ts_rtc_unload(void)
@ -184,8 +187,11 @@ static int ts78xx_fpga_load_devices(void)
if (ts78xx_fpga.supports.ts_rtc.present == 1) { if (ts78xx_fpga.supports.ts_rtc.present == 1) {
tmp = ts78xx_ts_rtc_load(); tmp = ts78xx_ts_rtc_load();
if (tmp) if (tmp) {
printk(KERN_INFO "TS-78xx RTC not detected or enabled\n"); printk(KERN_INFO "TS-78xx RTC"
" not detected or enabled\n");
ts78xx_fpga.supports.ts_rtc.present = 0;
}
ret |= tmp; ret |= tmp;
} }