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This contains the backlight portion of Meghana Madhyastha's patch set to 

migrate the backlight helpers from tinydrm to the backlight subsystem.
 
 https://patchwork.freedesktop.org/series/36522/
 
 Cc: Meghana Madhyastha <meghana.madhyastha@gmail.com>
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Merge tag 'topic/backlight_for_lag-2018-01-29' of git://anongit.freedesktop.org/drm/drm-misc into drm-misc-next

This contains the backlight portion of Meghana Madhyastha's patch set to
migrate the backlight helpers from tinydrm to the backlight subsystem.

https://patchwork.freedesktop.org/series/36522/

Cc: Meghana Madhyastha <meghana.madhyastha@gmail.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>

# gpg: Signature made Mon 29 Jan 2018 02:25:40 PM EST
# gpg:                using RSA key 7F17297CC4A076740CB3E42A96F70DFDA84A070A
# gpg: Good signature from "Sean Paul <seanpaul@chromium.org>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 1C5E AB9E D7C9 DDE9 E7F2  087C 732C 0025 72DC AF79
#      Subkey fingerprint: 7F17 297C C4A0 7674 0CB3  E42A 96F7 0DFD A84A 070A
Link: https://patchwork.freedesktop.org/patch/msgid/20180129192950.bvmhkz3h42t5a25r@art_vandelay
This commit is contained in:
Sean Paul 2018-02-20 10:33:04 -05:00
parent 07d85290f9 2e4ef3347b
commit f5155876af
2 changed files with 131 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
drivers/video/backlight/backlight.c
View File

@ -580,6 +580,79 @@ struct backlight_device *of_find_backlight_by_node(struct device_node *node)
EXPORT_SYMBOL(of_find_backlight_by_node);
#endif
/**
* of_find_backlight - Get backlight device
* @dev: Device
*
* This function looks for a property named 'backlight' on the DT node
* connected to @dev and looks up the backlight device.
*
* Call backlight_put() to drop the reference on the backlight device.
*
* Returns:
* A pointer to the backlight device if found.
* Error pointer -EPROBE_DEFER if the DT property is set, but no backlight
* device is found.
* NULL if there's no backlight property.
*/
struct backlight_device *of_find_backlight(struct device *dev)
{
struct backlight_device *bd = NULL;
struct device_node *np;
if (!dev)
return NULL;
if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
np = of_parse_phandle(dev->of_node, "backlight", 0);
if (np) {
bd = of_find_backlight_by_node(np);
of_node_put(np);
if (!bd)
return ERR_PTR(-EPROBE_DEFER);
/*
* Note: gpio_backlight uses brightness as
* power state during probe
*/
if (!bd->props.brightness)
bd->props.brightness = bd->props.max_brightness;
}
}
return bd;
}
EXPORT_SYMBOL(of_find_backlight);
static void devm_backlight_release(void *data)
{
backlight_put(data);
}
/**
* devm_of_find_backlight - Resource-managed of_find_backlight()
* @dev: Device
*
* Device managed version of of_find_backlight().
* The reference on the backlight device is automatically
* dropped on driver detach.
*/
struct backlight_device *devm_of_find_backlight(struct device *dev)
{
struct backlight_device *bd;
int ret;
bd = of_find_backlight(dev);
if (IS_ERR_OR_NULL(bd))
return bd;
ret = devm_add_action(dev, devm_backlight_release, bd);
if (ret) {
backlight_put(bd);
return ERR_PTR(ret);
}
return bd;
}
EXPORT_SYMBOL(devm_of_find_backlight);
static void __exit backlight_class_exit(void)
{
class_destroy(backlight_class);

58
include/linux/backlight.h
View File

@ -130,6 +130,48 @@ static inline int backlight_update_status(struct backlight_device *bd)
return ret;
}
/**
* backlight_enable - Enable backlight
* @bd: the backlight device to enable
*/
static inline int backlight_enable(struct backlight_device *bd)
{
if (!bd)
return 0;
bd->props.power = FB_BLANK_UNBLANK;
bd->props.fb_blank = FB_BLANK_UNBLANK;
bd->props.state &= ~BL_CORE_FBBLANK;
return backlight_update_status(bd);
}
/**
* backlight_disable - Disable backlight
* @bd: the backlight device to disable
*/
static inline int backlight_disable(struct backlight_device *bd)
{
if (!bd)
return 0;
bd->props.power = FB_BLANK_POWERDOWN;
bd->props.fb_blank = FB_BLANK_POWERDOWN;
bd->props.state |= BL_CORE_FBBLANK;
return backlight_update_status(bd);
}
/**
* backlight_put - Drop backlight reference
* @bd: the backlight device to put
*/
static inline void backlight_put(struct backlight_device *bd)
{
if (bd)
put_device(&bd->dev);
}
extern struct backlight_device *backlight_device_register(const char *name,
struct device *dev, void *devdata, const struct backlight_ops *ops,
const struct backlight_properties *props);
@ -173,4 +215,20 @@ of_find_backlight_by_node(struct device_node *node)
}
#endif
#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
struct backlight_device *of_find_backlight(struct device *dev);
struct backlight_device *devm_of_find_backlight(struct device *dev);
#else
static inline struct backlight_device *of_find_backlight(struct device *dev)
{
return NULL;
}
static inline struct backlight_device *
devm_of_find_backlight(struct device *dev)
{
return NULL;
}
#endif
#endif