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Message-ID: <20250407095119.588920-5-mitltlatltl@gmail.com>
Date: Mon, 7 Apr 2025 17:51:19 +0800
From: Pengyu Luo <mitltlatltl@...il.com>
To: Jianhua Lu <lujianhua000@...il.com>,
Lee Jones <lee@...nel.org>,
Daniel Thompson <danielt@...nel.org>,
Jingoo Han <jingoohan1@...il.com>,
Pavel Machek <pavel@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Helge Deller <deller@....de>
Cc: dri-devel@...ts.freedesktop.org,
linux-leds@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-fbdev@...r.kernel.org,
Pengyu Luo <mitltlatltl@...il.com>
Subject: [PATCH 4/4] backlight: ktz8866: add definitions to make it more readable
LSB, MSB and their handling are slightly confused, so improve it.
Signed-off-by: Pengyu Luo <mitltlatltl@...il.com>
---
drivers/video/backlight/ktz8866.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/video/backlight/ktz8866.c b/drivers/video/backlight/ktz8866.c
index b67ca136d..5364ecfc0 100644
--- a/drivers/video/backlight/ktz8866.c
+++ b/drivers/video/backlight/ktz8866.c
@@ -24,7 +24,9 @@
#define DEVICE_ID 0x01
#define BL_CFG1 0x02
#define BL_CFG2 0x03
+/* least significant byte */
#define BL_BRT_LSB 0x04
+/* most significant byte */
#define BL_BRT_MSB 0x05
#define BL_EN 0x08
#define LCD_BIAS_CFG1 0x09
@@ -47,6 +49,8 @@
#define PWM_HYST 0x5
#define CURRENT_SINKS_MASK GENMASK(5, 0)
+#define LOWER_BYTE GENMASK(2, 0)
+#define HIGHER_BYTE GENMASK(10, 3)
struct ktz8866_slave {
struct i2c_client *client;
@@ -105,8 +109,8 @@ static int ktz8866_backlight_update_status(struct backlight_device *backlight_de
}
/* Set brightness */
- ktz8866_write(ktz, BL_BRT_LSB, brightness & 0x7);
- ktz8866_write(ktz, BL_BRT_MSB, (brightness >> 3) & 0xFF);
+ ktz8866_write(ktz, BL_BRT_LSB, FIELD_GET(LOWER_BYTE, brightness);
+ ktz8866_write(ktz, BL_BRT_MSB, FIELD_GET(HIGHER_BYTE, brightness);
return 0;
}
--
2.49.0
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