[PATCH v2] auxdisplay: ht16k33: use le16_to_cpup() to fetch LE16 data

[Dmitry Torokhov]

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.torok...@gmail.com>
---
v2: do not compare result of i2c_smbus_read_i2c_block_data with
hard-coded value.

 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 f66b45b235b0..73f966434a2e 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];
-- 
2.12.2.564.g063fe858b8-goog


-- 
Dmitry