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