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authorLinus Walleij <linus.walleij@linaro.org>2022-04-04 22:35:22 +0200
committerPavel Machek <pavel@ucw.cz>2022-05-05 10:04:52 +0200
commit835fc89e249e07ec5c1587a297e30db8f2adcea3 (patch)
treedc956a5a1262a7651b2c853f0df6da22049a4452 /drivers/leds
parentleds: regulator: Add dev helper variable (diff)
downloadlinux-835fc89e249e07ec5c1587a297e30db8f2adcea3.tar.xz
linux-835fc89e249e07ec5c1587a297e30db8f2adcea3.zip
leds: regulator: Make probeable from device tree
The regulator LED can easily be adapted to probe from the device tree. We switch led_classdev_register() to led_classdev_register_ext() passing some struct led_init_data init_data that we leave NULL save the fwnode if platform data isn't present so that it will be populated from the device tree. If we have platform data we set up the name from the platform data but using init_data instead. Cc: Antonio Ospite <ao2@ao2.it> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Pavel Machek <pavel@ucw.cz>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/leds-regulator.c42
1 files changed, 23 insertions, 19 deletions
diff --git a/drivers/leds/leds-regulator.c b/drivers/leds/leds-regulator.c
index 87b9f46e572b..8a8b73b4e358 100644
--- a/drivers/leds/leds-regulator.c
+++ b/drivers/leds/leds-regulator.c
@@ -8,6 +8,7 @@
*/
#include <linux/module.h>
+#include <linux/mod_devicetable.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/leds.h>
@@ -124,18 +125,14 @@ static int regulator_led_probe(struct platform_device *pdev)
struct led_regulator_platform_data *pdata =
dev_get_platdata(&pdev->dev);
struct device *dev = &pdev->dev;
+ struct led_init_data init_data = {};
struct regulator_led *led;
struct regulator *vcc;
int ret = 0;
- if (pdata == NULL) {
- dev_err(dev, "no platform data\n");
- return -ENODEV;
- }
-
vcc = devm_regulator_get_exclusive(dev, "vled");
if (IS_ERR(vcc)) {
- dev_err(dev, "Cannot get vcc for %s\n", pdata->name);
+ dev_err(dev, "Cannot get vcc\n");
return PTR_ERR(vcc);
}
@@ -143,15 +140,21 @@ static int regulator_led_probe(struct platform_device *pdev)
if (led == NULL)
return -ENOMEM;
+ init_data.fwnode = dev->fwnode;
+
led->cdev.max_brightness = led_regulator_get_max_brightness(vcc);
- if (pdata->brightness > led->cdev.max_brightness) {
- dev_err(dev, "Invalid default brightness %d\n",
+ /* Legacy platform data label assignment */
+ if (pdata) {
+ if (pdata->brightness > led->cdev.max_brightness) {
+ dev_err(dev, "Invalid default brightness %d\n",
pdata->brightness);
- return -EINVAL;
+ return -EINVAL;
+ }
+ led->cdev.brightness = pdata->brightness;
+ init_data.default_label = pdata->name;
}
led->cdev.brightness_set_blocking = regulator_led_brightness_set;
- led->cdev.name = pdata->name;
led->cdev.flags |= LED_CORE_SUSPENDRESUME;
led->vcc = vcc;
@@ -163,16 +166,10 @@ static int regulator_led_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, led);
- ret = led_classdev_register(dev, &led->cdev);
+ ret = led_classdev_register_ext(dev, &led->cdev, &init_data);
if (ret < 0)
return ret;
- /* to expose the default value to userspace */
- led->cdev.brightness = pdata->brightness;
-
- /* Set the default led status */
- regulator_led_brightness_set(&led->cdev, led->cdev.brightness);
-
return 0;
}
@@ -185,10 +182,17 @@ static int regulator_led_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id regulator_led_of_match[] = {
+ { .compatible = "regulator-led", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, regulator_led_of_match);
+
static struct platform_driver regulator_led_driver = {
.driver = {
- .name = "leds-regulator",
- },
+ .name = "leds-regulator",
+ .of_match_table = regulator_led_of_match,
+ },
.probe = regulator_led_probe,
.remove = regulator_led_remove,
};