That enum adds a "keep" state which permits to tell the
driver trough its platform data not to touch the
hardware during the probe.
Cc: Richard Purdie <rpurdie@xxxxxxxxx>
Cc: Jingoo Han <jg1.han@xxxxxxxxxxx>
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
Cc: Pawel Moll <pawel.moll@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Stephen Warren <swarren@xxxxxxxxxxxxx>
Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: Sascha Hauer <kernel@xxxxxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: Lothar Waßmann <LW@xxxxxxxxxxxxxxxxxxx>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@xxxxxxxxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
Cc: Eric Bénard <eric@xxxxxxxxxx>
Signed-off-by: Denis Carikli <denis@xxxxxxxxxx>
---
ChangeLog v5->v6:
- New patch.
---
drivers/video/backlight/gpio_backlight.c | 7 +++++--
include/linux/platform_data/gpio_backlight.h | 6 ++++++
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index 81fb127..6ddeba9 100644
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -23,6 +23,7 @@ struct gpio_backlight {
int gpio;
int active;
+ enum gpio_backlight_default_state def_value;
};
static int gpio_backlight_update_status(struct backlight_device *bl)
@@ -103,8 +104,10 @@ static int gpio_backlight_probe(struct platform_device *pdev)
return PTR_ERR(bl);
}
- bl->props.brightness = pdata->def_value;
- backlight_update_status(bl);
+ if (pdata->def_value != BACKLIGHT_GPIO_DEFSTATE_KEEP) {
+ bl->props.brightness = pdata->def_value;
+ backlight_update_status(bl);
+ }
platform_set_drvdata(pdev, bl);
return 0;
diff --git a/include/linux/platform_data/gpio_backlight.h b/include/linux/platform_data/gpio_backlight.h
index 5ae0d9c..3b437b3 100644
--- a/include/linux/platform_data/gpio_backlight.h
+++ b/include/linux/platform_data/gpio_backlight.h
@@ -10,6 +10,12 @@
struct device;
+enum gpio_backlight_default_state {
+ BACKLIGHT_GPIO_DEFSTATE_OFF,
+ BACKLIGHT_GPIO_DEFSTATE_ON,
+ BACKLIGHT_GPIO_DEFSTATE_KEEP,
+};
+
struct gpio_backlight_platform_data {
struct device *fbdev;
int gpio;
--
1.7.9.5
--
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