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I have discovered that the current version of rtc-x1205.c does not work correctly when asked to set the alarm time by the RTC_WKALM_SET ioctl() call. This happens because the alarm registers do not behave like the current-time registers. They are non-volatile. Two things go wrong: - the X1205 requires a 10 msec delay after any attempt to write to the non-volatile registers. The x1205_set_datetime() routine does the write as 8 single-byte writes without any delay. Only the first write succeeds. The second is NAKed because the chip is busy. - the X1205 resets the RWEL bit after any write to the non-volatile registers. This would lock out any further writes after the first even with a 10msec delay. I fix this by doing a single 8-byte write and then waiting 10msec for the chip to be ready. A side effect of this change is that it will speed up x1205_rtc_set_time() which uses the same code. I have also implemented the 'enable' bit in the rtc_wkalm structure, which the existing driver does not attempt to do. I have modified both x1205_rtc_set_alarm() to set the AL0E bit, and x1205_rtc_read_alarm() to return it. I have tested this patch on a LinkSys NSLU2 under OpenWRT, but on no other hardware. On the NSLU2 the X1205 correctly asserts its IRQ pin when the alarm time matches the current time. [akpm@linux-foundation.org: clean up over-parenthesisation] Signed-off-by: Michael Hamel <mhamel@adi.co.nz> Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| .. | ||
| class.c | ||
| hctosys.c | ||
| interface.c | ||
| Kconfig | ||
| Makefile | ||
| rtc-at32ap700x.c | ||
| rtc-at91rm9200.c | ||
| rtc-at91sam9.c | ||
| rtc-bfin.c | ||
| rtc-cmos.c | ||
| rtc-core.h | ||
| rtc-dev.c | ||
| rtc-ds1216.c | ||
| rtc-ds1302.c | ||
| rtc-ds1307.c | ||
| rtc-ds1374.c | ||
| rtc-ds1511.c | ||
| rtc-ds1553.c | ||
| rtc-ds1672.c | ||
| rtc-ds1742.c | ||
| rtc-ep93xx.c | ||
| rtc-fm3130.c | ||
| rtc-isl1208.c | ||
| rtc-lib.c | ||
| rtc-m41t80.c | ||
| rtc-m48t59.c | ||
| rtc-m48t86.c | ||
| rtc-max6900.c | ||
| rtc-max6902.c | ||
| rtc-omap.c | ||
| rtc-pcf8563.c | ||
| rtc-pcf8583.c | ||
| rtc-pl031.c | ||
| rtc-ppc.c | ||
| rtc-proc.c | ||
| rtc-r9701.c | ||
| rtc-rs5c313.c | ||
| rtc-rs5c348.c | ||
| rtc-rs5c372.c | ||
| rtc-s3c.c | ||
| rtc-s35390a.c | ||
| rtc-sa1100.c | ||
| rtc-sh.c | ||
| rtc-stk17ta8.c | ||
| rtc-sysfs.c | ||
| rtc-test.c | ||
| rtc-v3020.c | ||
| rtc-vr41xx.c | ||
| rtc-x1205.c | ||