mirror of
https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9.git
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Gavin Shan
24925fe4a6
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2183349 commit 19409796578c879a41e88ddbdbce50c19457658d Author: Ahmad Fatoum <a.fatoum@pengutronix.de> Date: Wed Nov 23 10:55:26 2022 +0100 include/linux/bcd.h: provide bcd_is_valid() helper bcd2bin(0x0A) happily returns 10, despite this being an invalid BCD value. RTC drivers converting possibly corrupted BCD timestamps might want to validate their input before calling bcd2bin(). Provide a macro to do so. Unlike bcd2bin and bin2bcd, out-of-line versions are not implemented. Should the macro experience enough use, this can be retrofitted. Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Link: https://lore.kernel.org/r/20221123095527.2771434-2-s.hauer@pengutronix.de Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> (cherry picked from commit 19409796578c879a41e88ddbdbce50c19457658d) Signed-off-by: Gavin Shan <gshan@redhat.com>
28 lines
683 B
C
28 lines
683 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCD_H
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#define _BCD_H
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#include <linux/compiler.h>
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#define bcd2bin(x) \
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(__builtin_constant_p((u8 )(x)) ? \
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const_bcd2bin(x) : \
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_bcd2bin(x))
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#define bin2bcd(x) \
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(__builtin_constant_p((u8 )(x)) ? \
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const_bin2bcd(x) : \
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_bin2bcd(x))
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#define bcd_is_valid(x) \
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const_bcd_is_valid(x)
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#define const_bcd2bin(x) (((x) & 0x0f) + ((x) >> 4) * 10)
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#define const_bin2bcd(x) ((((x) / 10) << 4) + (x) % 10)
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#define const_bcd_is_valid(x) (((x) & 0x0f) < 10 && ((x) >> 4) < 10)
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unsigned _bcd2bin(unsigned char val) __attribute_const__;
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unsigned char _bin2bcd(unsigned val) __attribute_const__;
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#endif /* _BCD_H */
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