mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-29 00:05:54 +02:00
82 lines
2.5 KiB
Diff
82 lines
2.5 KiB
Diff
|
From c9d44c8b43d29dd500c1dd711e490bdcd47f2830 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Andy Green <andy@openmoko.com>
|
||
|
|
Date: Tue, 13 May 2008 18:53:40 +0100
|
||
|
|
Subject: [PATCH] fix-backlight-disable-on-zero-intensity.patch
|
||
|
|
|
||
|
|
It's never right to put 0 intensity into LEDOUT according to datasheet
|
||
|
|
But having a floor at intensity 2 means backlight isn't properly off
|
||
|
|
when "dimmed". So change to intensity 0 --> disable backlight.
|
||
|
|
|
||
|
|
Signed-off-by: Andy Green <andy@openmoko.com>
|
||
|
|
---
|
||
|
|
drivers/i2c/chips/pcf50633.c | 34 +++++++++++++++++++++-------------
|
||
|
|
1 files changed, 21 insertions(+), 13 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
|
||
|
|
index dc4ea0a..205f4e3 100644
|
||
|
|
--- a/drivers/i2c/chips/pcf50633.c
|
||
|
|
+++ b/drivers/i2c/chips/pcf50633.c
|
||
|
|
@@ -1458,6 +1458,9 @@ static int pcf50633bl_get_intensity(struct backlight_device *bd)
|
||
|
|
struct pcf50633_data *pcf = bl_get_data(bd);
|
||
|
|
int intensity = reg_read(pcf, PCF50633_REG_LEDOUT);
|
||
|
|
|
||
|
|
+ if (!(reg_read(pcf, PCF50633_REG_LEDOUT) & 1))
|
||
|
|
+ intensity = 0;
|
||
|
|
+
|
||
|
|
return intensity & 0x3f;
|
||
|
|
}
|
||
|
|
|
||
|
|
@@ -1466,31 +1469,36 @@ static int pcf50633bl_set_intensity(struct backlight_device *bd)
|
||
|
|
struct pcf50633_data *pcf = bl_get_data(bd);
|
||
|
|
int intensity = bd->props.brightness;
|
||
|
|
int old_intensity = reg_read(pcf, PCF50633_REG_LEDOUT);
|
||
|
|
- u_int8_t ledena = 2;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
- if (bd->props.power != FB_BLANK_UNBLANK)
|
||
|
|
- intensity = 0;
|
||
|
|
- if (bd->props.fb_blank != FB_BLANK_UNBLANK)
|
||
|
|
+ if (!(reg_read(pcf, PCF50633_REG_LEDOUT) & 1))
|
||
|
|
+ old_intensity = 0;
|
||
|
|
+
|
||
|
|
+ if ((bd->props.power != FB_BLANK_UNBLANK) ||
|
||
|
|
+ (bd->props.fb_blank != FB_BLANK_UNBLANK))
|
||
|
|
intensity = 0;
|
||
|
|
|
||
|
|
- /* The PCF50633 cannot handle LEDOUT = 0 (datasheet p60)
|
||
|
|
+ /*
|
||
|
|
+ * The PCF50633 cannot handle LEDOUT = 0 (datasheet p60)
|
||
|
|
* if seen, you have to re-enable the LED unit
|
||
|
|
+ * we treat intensity 0 as disable
|
||
|
|
*/
|
||
|
|
|
||
|
|
- if (intensity != 0 && old_intensity == 0) {
|
||
|
|
- ledena = reg_read(pcf, PCF50633_REG_LEDENA);
|
||
|
|
- reg_write(pcf, PCF50633_REG_LEDENA, 0x00);
|
||
|
|
+ if (intensity && !old_intensity) {
|
||
|
|
+ ret = reg_set_bit_mask(pcf, PCF50633_REG_LEDENA, 0x01, 0x00);
|
||
|
|
+ if (ret)
|
||
|
|
+ return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!intensity) /* illegal to set LEDOUT to 0 */
|
||
|
|
- ret = reg_set_bit_mask(pcf, PCF50633_REG_LEDOUT, 0x3f, 2);
|
||
|
|
- else
|
||
|
|
+ ret = reg_set_bit_mask(pcf, PCF50633_REG_LEDENA, 0x01, 0x00);
|
||
|
|
+ else {
|
||
|
|
ret = reg_set_bit_mask(pcf, PCF50633_REG_LEDOUT, 0x3f,
|
||
|
|
intensity);
|
||
|
|
-
|
||
|
|
- if (intensity != 0 && old_intensity == 0)
|
||
|
|
- reg_write(pcf, PCF50633_REG_LEDENA, ledena);
|
||
|
|
+ if (ret)
|
||
|
|
+ return ret;
|
||
|
|
+ ret = reg_set_bit_mask(pcf, PCF50633_REG_LEDENA, 0x01, 0x01);
|
||
|
|
+ }
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
--
|
||
|
|
1.5.6.5
|
||
|
|
|