diff options
| author | Jean-Jacques Hiblot <jjhiblot@traphandler.com> | 2023-07-28 17:37:29 +0200 |
|---|---|---|
| committer | Lee Jones <lee@kernel.org> | 2023-08-17 09:00:34 +0100 |
| commit | c7d80059b086c4986cd994a1973ec7a5d75f8eea (patch) | |
| tree | b93389acfcb0c97f22b2493f98db93a69bef0c0a /drivers/leds | |
| parent | afb48153220d35f330d0d979792920a31f7d9a81 (diff) | |
| download | linux-c7d80059b086c4986cd994a1973ec7a5d75f8eea.tar.gz | |
leds: class: Store the color index in struct led_classdev
Store the color of the LED so that it is not lost after the LED's
name has been composed. This color information can then be exposed to
the user space or used by the LED consumer.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
Link: https://lore.kernel.org/r/20230728153731.3742339-3-jjhiblot@traphandler.com
Signed-off-by: Lee Jones <lee@kernel.org>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/led-class.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 78068b06d009a..4bcbd46ec75a0 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -76,6 +76,19 @@ static ssize_t max_brightness_show(struct device *dev, } static DEVICE_ATTR_RO(max_brightness); +static ssize_t color_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + const char *color_text = "invalid"; + struct led_classdev *led_cdev = dev_get_drvdata(dev); + + if (led_cdev->color < LED_COLOR_ID_MAX) + color_text = led_colors[led_cdev->color]; + + return sysfs_emit(buf, "%s\n", color_text); +} +static DEVICE_ATTR_RO(color); + #ifdef CONFIG_LEDS_TRIGGERS static BIN_ATTR(trigger, 0644, led_trigger_read, led_trigger_write, 0); static struct bin_attribute *led_trigger_bin_attrs[] = { @@ -90,6 +103,7 @@ static const struct attribute_group led_trigger_group = { static struct attribute *led_class_attrs[] = { &dev_attr_brightness.attr, &dev_attr_max_brightness.attr, + &dev_attr_color.attr, NULL, }; @@ -486,6 +500,10 @@ int led_classdev_register_ext(struct device *parent, fwnode_property_read_u32(init_data->fwnode, "max-brightness", &led_cdev->max_brightness); + + if (fwnode_property_present(init_data->fwnode, "color")) + fwnode_property_read_u32(init_data->fwnode, "color", + &led_cdev->color); } } else { proposed_name = led_cdev->name; @@ -495,6 +513,9 @@ int led_classdev_register_ext(struct device *parent, if (ret < 0) return ret; + if (led_cdev->color >= LED_COLOR_ID_MAX) + dev_warn(parent, "LED %s color identifier out of range\n", final_name); + mutex_init(&led_cdev->led_access); mutex_lock(&led_cdev->led_access); led_cdev->dev = device_create_with_groups(leds_class, parent, 0, |