summaryrefslogtreecommitdiff
path: root/include/linux/leds.h
diff options
context:
space:
mode:
authorHans de Goede <hdegoede@redhat.com>2023-01-20 14:45:17 +0300
committerLee Jones <lee@kernel.org>2023-01-27 14:07:11 +0300
commitabc3100fcba6827444ef4bdb17065ac3b6619dff (patch)
treee05efc7d727c7213a518720d18fd4a76f5690e07 /include/linux/leds.h
parent537bdca2a085f524b74ac2aa83822d081c585ca6 (diff)
downloadlinux-abc3100fcba6827444ef4bdb17065ac3b6619dff.tar.xz
leds: led-class: Add generic [devm_]led_get()
Add a generic [devm_]led_get() method which can be used on both devicetree and non devicetree platforms to get a LED classdev associated with a specific function on a specific device, e.g. the privacy LED associated with a specific camera sensor. Note unlike of_led_get() this takes a string describing the function rather then an index. This is done because e.g. camera sensors might have a privacy LED, or a flash LED, or both and using an index approach leaves it unclear what the function of index 0 is if there is only 1 LED. This uses a lookup-table mechanism for non devicetree platforms. This allows the platform code to map specific LED class_dev-s to a specific device,function combinations this way. For devicetree platforms getting the LED by function-name could be made to work using the standard devicetree pattern of adding a -names string array to map names to the indexes. Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Lee Jones <lee@kernel.org> Link: https://lore.kernel.org/r/20230120114524.408368-5-hdegoede@redhat.com
Diffstat (limited to 'include/linux/leds.h')
-rw-r--r--include/linux/leds.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/leds.h b/include/linux/leds.h
index ba4861ec73d3..31cb74b90ffc 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -39,6 +39,21 @@ enum led_default_state {
LEDS_DEFSTATE_KEEP = 2,
};
+/**
+ * struct led_lookup_data - represents a single LED lookup entry
+ *
+ * @list: internal list of all LED lookup entries
+ * @provider: name of led_classdev providing the LED
+ * @dev_id: name of the device associated with this LED
+ * @con_id: name of the LED from the device's point of view
+ */
+struct led_lookup_data {
+ struct list_head list;
+ const char *provider;
+ const char *dev_id;
+ const char *con_id;
+};
+
struct led_init_data {
/* device fwnode handle */
struct fwnode_handle *fwnode;
@@ -211,6 +226,12 @@ void devm_led_classdev_unregister(struct device *parent,
void led_classdev_suspend(struct led_classdev *led_cdev);
void led_classdev_resume(struct led_classdev *led_cdev);
+void led_add_lookup(struct led_lookup_data *led_lookup);
+void led_remove_lookup(struct led_lookup_data *led_lookup);
+
+struct led_classdev *__must_check led_get(struct device *dev, char *con_id);
+struct led_classdev *__must_check devm_led_get(struct device *dev, char *con_id);
+
extern struct led_classdev *of_led_get(struct device_node *np, int index);
extern void led_put(struct led_classdev *led_cdev);
struct led_classdev *__must_check devm_of_led_get(struct device *dev,