From 87cf5127968ab3c543ebd98253052b928f9b47da Mon Sep 17 00:00:00 2001 From: Quan Nguyen Date: Wed, 19 May 2021 14:49:28 +0700 Subject: i2c: core-smbus: Expose PEC calculate function for generic use Expose the PEC calculation i2c_smbus_pec() for generic use. Signed-off-by: Quan Nguyen Acked-by: Matt Johnston Signed-off-by: Wolfram Sang --- drivers/i2c/i2c-core-smbus.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) (limited to 'drivers/i2c/i2c-core-smbus.c') diff --git a/drivers/i2c/i2c-core-smbus.c b/drivers/i2c/i2c-core-smbus.c index d2d32c0fd8c3..e5b2d1465e7e 100644 --- a/drivers/i2c/i2c-core-smbus.c +++ b/drivers/i2c/i2c-core-smbus.c @@ -37,8 +37,15 @@ static u8 crc8(u16 data) return (u8)(data >> 8); } -/* Incremental CRC8 over count bytes in the array pointed to by p */ -static u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count) +/** + * i2c_smbus_pec - Incremental CRC8 over the given input data array + * @crc: previous return crc8 value + * @p: pointer to data buffer. + * @count: number of bytes in data buffer. + * + * Incremental CRC8 over count bytes in the array pointed to by p + */ +u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count) { int i; @@ -46,6 +53,7 @@ static u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count) crc = crc8((crc ^ p[i]) << 8); return crc; } +EXPORT_SYMBOL(i2c_smbus_pec); /* Assume a 7-bit address, which is reasonable for SMBus */ static u8 i2c_smbus_msg_pec(u8 pec, struct i2c_msg *msg) -- cgit v1.2.3