backlight: qcom-wled: Use cpu_to_le16 macro to perform conversion

[ Upstream commit 0a139358548968b2ff308257b4fbeec7badcc3e1 ]

The kernel already provides appropriate primitives to perform endianness
conversion which should be used in favour of manual bit-wrangling.

Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211115203459.1634079-4-marijn.suijten@somainline.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index c057368..5306b06 100644 (file)
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -231,14 +231,14 @@ struct wled {
 static int wled3_set_brightness(struct wled *wled, u16 brightness)
 {
        int rc, i;
-       u8 v[2];
+       __le16 v;
 
-       v[0] = brightness & 0xff;
-       v[1] = (brightness >> 8) & 0xf;
+       v = cpu_to_le16(brightness & WLED3_SINK_REG_BRIGHT_MAX);
 
        for (i = 0;  i < wled->cfg.num_strings; ++i) {
                rc = regmap_bulk_write(wled->regmap, wled->ctrl_addr +
-                                      WLED3_SINK_REG_BRIGHT(i), v, 2);
+                                      WLED3_SINK_REG_BRIGHT(i),
+                                      &v, sizeof(v));
                if (rc < 0)
                        return rc;
        }
@@ -250,18 +250,18 @@ static int wled4_set_brightness(struct wled *wled, u16 brightness)
 {
        int rc, i;
        u16 low_limit = wled->max_brightness * 4 / 1000;
-       u8 v[2];
+       __le16 v;
 
        /* WLED4's lower limit of operation is 0.4% */
        if (brightness > 0 && brightness < low_limit)
                brightness = low_limit;
 
-       v[0] = brightness & 0xff;
-       v[1] = (brightness >> 8) & 0xf;
+       v = cpu_to_le16(brightness & WLED3_SINK_REG_BRIGHT_MAX);
 
        for (i = 0;  i < wled->cfg.num_strings; ++i) {
                rc = regmap_bulk_write(wled->regmap, wled->sink_addr +
-                                      WLED4_SINK_REG_BRIGHT(i), v, 2);
+                                      WLED4_SINK_REG_BRIGHT(i),
+                                      &v, sizeof(v));
                if (rc < 0)
                        return rc;
        }
@@ -273,21 +273,20 @@ static int wled5_set_brightness(struct wled *wled, u16 brightness)
 {
        int rc, offset;
        u16 low_limit = wled->max_brightness * 1 / 1000;
-       u8 v[2];
+       __le16 v;
 
        /* WLED5's lower limit is 0.1% */
        if (brightness < low_limit)
                brightness = low_limit;
 
-       v[0] = brightness & 0xff;
-       v[1] = (brightness >> 8) & 0x7f;
+       v = cpu_to_le16(brightness & WLED5_SINK_REG_BRIGHT_MAX_15B);
 
        offset = (wled->cfg.mod_sel == MOD_A) ?
                  WLED5_SINK_REG_MOD_A_BRIGHTNESS_LSB :
                  WLED5_SINK_REG_MOD_B_BRIGHTNESS_LSB;
 
        rc = regmap_bulk_write(wled->regmap, wled->sink_addr + offset,
-                              v, 2);
+                              &v, sizeof(v));
        return rc;
 }