From 6ef0c3337ac9a0a963208beed92d478a317d7888 Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Sat, 1 Apr 2017 10:27:14 -0700
Subject: [PATCH] auxdisplay: ht16k33: use le16_to_cpup() to fetch LE16 data
The data read from the device is 3 little-endian words, so let's
annotate them as such and use le16_to_cpu() to convert them to host
endianness - it might turn out to be a bit more performant, and it
expresses the conversion more clearly.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/auxdisplay/ht16k33.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
index ba63709745747..fbfa5b4cc567e 100644
--- a/drivers/auxdisplay/ht16k33.c
+++ b/drivers/auxdisplay/ht16k33.c
@@ -254,18 +254,22 @@ static bool ht16k33_keypad_scan(struct ht16k33_keypad *keypad)
{
const unsigned short *keycodes = keypad->dev->keycode;
u16 new_state[HT16K33_MATRIX_KEYPAD_MAX_COLS];
- u8 data[HT16K33_MATRIX_KEYPAD_MAX_COLS * 2];
+ __le16 data[HT16K33_MATRIX_KEYPAD_MAX_COLS];
unsigned long bits_changed;
int row, col, code;
+ int rc;
bool pressed = false;
- if (i2c_smbus_read_i2c_block_data(keypad->client, 0x40, 6, data) != 6) {
- dev_err(&keypad->client->dev, "Failed to read key data\n");
+ rc = i2c_smbus_read_i2c_block_data(keypad->client, 0x40,
+ sizeof(data), (u8 *)data);
+ if (rc != sizeof(data)) {
+ dev_err(&keypad->client->dev,
+ "Failed to read key data, rc=%d\n", rc);
return false;
}
for (col = 0; col < keypad->cols; col++) {
- new_state[col] = (data[col * 2 + 1] << 8) | data[col * 2];
+ new_state[col] = le16_to_cpu(data[col]);
if (new_state[col])
pressed = true;
bits_changed = keypad->last_key_state[col] ^ new_state[col];
--
GitLab