[PATCH v3 15/19] auxdisplay: ht16k33: Extract ht16k33_brightness_set()

From: Geert Uytterhoeven
Date: Wed Jul 14 2021 - 11:12:21 EST


Extract brightness handling into a helper function, so it can be called
from multiple places.

Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
v3:
- Use "err" instead of "error" to be consistent with existing driver
naming style,

v2:
- No changes.
---
drivers/auxdisplay/ht16k33.c | 25 +++++++++++++++++++------
1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
index c7a3a0e1fbb5d03e..928ac9722c142855 100644
--- a/drivers/auxdisplay/ht16k33.c
+++ b/drivers/auxdisplay/ht16k33.c
@@ -113,6 +113,22 @@ static int ht16k33_display_off(struct ht16k33_priv *priv)
return i2c_smbus_write_byte(priv->client, REG_DISPLAY_SETUP);
}

+static int ht16k33_brightness_set(struct ht16k33_priv *priv,
+ unsigned int brightness)
+{
+ int err;
+
+ if (brightness == 0)
+ return ht16k33_display_off(priv);
+
+ err = ht16k33_display_on(priv);
+ if (err)
+ return err;
+
+ return i2c_smbus_write_byte(priv->client,
+ REG_BRIGHTNESS | (brightness - 1));
+}
+
static void ht16k33_fb_queue(struct ht16k33_priv *priv)
{
struct ht16k33_fbdev *fbdev = &priv->fbdev;
@@ -197,13 +213,10 @@ static int ht16k33_bl_update_status(struct backlight_device *bl)

if (bl->props.power != FB_BLANK_UNBLANK ||
bl->props.fb_blank != FB_BLANK_UNBLANK ||
- bl->props.state & BL_CORE_FBBLANK || brightness == 0) {
- return ht16k33_display_off(priv);
- }
+ bl->props.state & BL_CORE_FBBLANK)
+ brightness = 0;

- ht16k33_display_on(priv);
- return i2c_smbus_write_byte(priv->client,
- REG_BRIGHTNESS | (brightness - 1));
+ return ht16k33_brightness_set(priv, brightness);
}

static int ht16k33_bl_check_fb(struct backlight_device *bl, struct fb_info *fi)
--
2.25.1