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Input: edt-ft5x06 - unify the crc check

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With this patch, the CRC is always verified by the same function, even in
the case of accessing registers where the number of bytes is minimal.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://lore.kernel.org/r/20230402200951.1032513-9-dario.binacchi@amarulasolutions.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dario Binacchi 2023-04-02 21:36:33 -07:00 committed by Dmitry Torokhov
parent 9dfd9708ff
commit 079e60a53c
1 changed files with 3 additions and 6 deletions
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9
drivers/input/touchscreen/edt-ft5x06.c
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@ -240,13 +240,10 @@ static int edt_M06_i2c_read(void *context, const void *reg_buf, size_t reg_size,
if (!edt_ft5x06_ts_check_crc(tsdata, val_buf, val_size))
return -EIO;
} else if (reg_read) {
u8 crc = wbuf[0] ^ wbuf[1] ^ rbuf[0];
if (crc != rbuf[1]) {
dev_err(dev, "crc error: 0x%02x expected, got 0x%02x\n",
crc, rbuf[1]);
wbuf[2] = rbuf[0];
wbuf[3] = rbuf[1];
if (!edt_ft5x06_ts_check_crc(tsdata, wbuf, 4))
return -EIO;
}
*((u8 *)val_buf) = rbuf[0];
}