#include <linux/module.h>
#include <linux/kernel.h>
-#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>
#include <linux/fb.h>
struct led_pwm_data *led_dat =
container_of(led_cdev, struct led_pwm_data, cdev);
unsigned int max = led_dat->cdev.max_brightness;
- unsigned int period = led_dat->period;
+ unsigned long long duty = led_dat->period;
- led_dat->duty = brightness * period / max;
+ duty *= brightness;
+ do_div(duty, max);
+
+ if (led_dat->active_low)
+ duty = led_dat->period - duty;
+
+ led_dat->duty = duty;
if (led_dat->can_sleep)
schedule_work(&led_dat->work);
(sizeof(struct led_pwm_data) * num_leds);
}
-static struct led_pwm_priv *led_pwm_create_of(struct platform_device *pdev)
+static void led_pwm_cleanup(struct led_pwm_priv *priv)
{
- struct device_node *node = pdev->dev.of_node;
- struct device_node *child;
- struct led_pwm_priv *priv;
- int count, ret;
+ while (priv->num_leds--) {
+ led_classdev_unregister(&priv->leds[priv->num_leds].cdev);
+ if (priv->leds[priv->num_leds].can_sleep)
+ cancel_work_sync(&priv->leds[priv->num_leds].work);
+ }
+}
- /* count LEDs in this device, so we know how much to allocate */
- count = of_get_child_count(node);
- if (!count)
- return NULL;
+static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
+ struct led_pwm *led, struct device_node *child)
+{
+ struct led_pwm_data *led_data = &priv->leds[priv->num_leds];
+ int ret;
+
+ led_data->active_low = led->active_low;
+ led_data->cdev.name = led->name;
+ led_data->cdev.default_trigger = led->default_trigger;
+ led_data->cdev.brightness_set = led_pwm_set;
+ led_data->cdev.brightness = LED_OFF;
+ led_data->cdev.max_brightness = led->max_brightness;
+ led_data->cdev.flags = LED_CORE_SUSPENDRESUME;
+
+ if (child)
+ led_data->pwm = devm_of_pwm_get(dev, child, NULL);
+ else
+ led_data->pwm = devm_pwm_get(dev, led->name);
+ if (IS_ERR(led_data->pwm)) {
+ ret = PTR_ERR(led_data->pwm);
+ dev_err(dev, "unable to request PWM for %s: %d\n",
+ led->name, ret);
+ return ret;
+ }
- priv = devm_kzalloc(&pdev->dev, sizeof_pwm_leds_priv(count),
- GFP_KERNEL);
- if (!priv)
- return NULL;
+ led_data->can_sleep = pwm_can_sleep(led_data->pwm);
+ if (led_data->can_sleep)
+ INIT_WORK(&led_data->work, led_pwm_work);
- for_each_child_of_node(node, child) {
- struct led_pwm_data *led_dat = &priv->leds[priv->num_leds];
+ led_data->period = pwm_get_period(led_data->pwm);
+ if (!led_data->period && (led->pwm_period_ns > 0))
+ led_data->period = led->pwm_period_ns;
- led_dat->cdev.name = of_get_property(child, "label",
- NULL) ? : child->name;
+ ret = led_classdev_register(dev, &led_data->cdev);
+ if (ret == 0) {
+ priv->num_leds++;
+ } else {
+ dev_err(dev, "failed to register PWM led for %s: %d\n",
+ led->name, ret);
+ }
- led_dat->pwm = devm_of_pwm_get(&pdev->dev, child, NULL);
- if (IS_ERR(led_dat->pwm)) {
- dev_err(&pdev->dev, "unable to request PWM for %s\n",
- led_dat->cdev.name);
- goto err;
- }
- /* Get the period from PWM core when n*/
- led_dat->period = pwm_get_period(led_dat->pwm);
+ return ret;
+}
- led_dat->cdev.default_trigger = of_get_property(child,
- "linux,default-trigger", NULL);
- of_property_read_u32(child, "max-brightness",
- &led_dat->cdev.max_brightness);
+static int led_pwm_create_of(struct device *dev, struct led_pwm_priv *priv)
+{
+ struct device_node *child;
+ struct led_pwm led;
+ int ret = 0;
+
+ memset(&led, 0, sizeof(led));
- led_dat->cdev.brightness_set = led_pwm_set;
- led_dat->cdev.brightness = LED_OFF;
- led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+ for_each_child_of_node(dev->of_node, child) {
+ led.name = of_get_property(child, "label", NULL) ? :
+ child->name;
- led_dat->can_sleep = pwm_can_sleep(led_dat->pwm);
- if (led_dat->can_sleep)
- INIT_WORK(&led_dat->work, led_pwm_work);
+ led.default_trigger = of_get_property(child,
+ "linux,default-trigger", NULL);
+ led.active_low = of_property_read_bool(child, "active-low");
+ of_property_read_u32(child, "max-brightness",
+ &led.max_brightness);
- ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
- if (ret < 0) {
- dev_err(&pdev->dev, "failed to register for %s\n",
- led_dat->cdev.name);
+ ret = led_pwm_add(dev, priv, &led, child);
+ if (ret) {
of_node_put(child);
- goto err;
+ break;
}
- priv->num_leds++;
}
- return priv;
-err:
- while (priv->num_leds--)
- led_classdev_unregister(&priv->leds[priv->num_leds].cdev);
-
- return NULL;
+ return ret;
}
static int led_pwm_probe(struct platform_device *pdev)
{
- struct led_pwm_platform_data *pdata = pdev->dev.platform_data;
+ struct led_pwm_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct led_pwm_priv *priv;
- int i, ret = 0;
-
- if (pdata && pdata->num_leds) {
- priv = devm_kzalloc(&pdev->dev,
- sizeof_pwm_leds_priv(pdata->num_leds),
- GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
-
- for (i = 0; i < pdata->num_leds; i++) {
- struct led_pwm *cur_led = &pdata->leds[i];
- struct led_pwm_data *led_dat = &priv->leds[i];
-
- led_dat->pwm = devm_pwm_get(&pdev->dev, cur_led->name);
- if (IS_ERR(led_dat->pwm)) {
- ret = PTR_ERR(led_dat->pwm);
- dev_err(&pdev->dev,
- "unable to request PWM for %s\n",
- cur_led->name);
- goto err;
- }
-
- led_dat->cdev.name = cur_led->name;
- led_dat->cdev.default_trigger = cur_led->default_trigger;
- led_dat->active_low = cur_led->active_low;
- led_dat->period = cur_led->pwm_period_ns;
- led_dat->cdev.brightness_set = led_pwm_set;
- led_dat->cdev.brightness = LED_OFF;
- led_dat->cdev.max_brightness = cur_led->max_brightness;
- led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
-
- led_dat->can_sleep = pwm_can_sleep(led_dat->pwm);
- if (led_dat->can_sleep)
- INIT_WORK(&led_dat->work, led_pwm_work);
-
- ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
- if (ret < 0)
- goto err;
+ int count, i;
+ int ret = 0;
+
+ if (pdata)
+ count = pdata->num_leds;
+ else
+ count = of_get_child_count(pdev->dev.of_node);
+
+ if (!count)
+ return -EINVAL;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof_pwm_leds_priv(count),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ if (pdata) {
+ for (i = 0; i < count; i++) {
+ ret = led_pwm_add(&pdev->dev, priv, &pdata->leds[i],
+ NULL);
+ if (ret)
+ break;
}
- priv->num_leds = pdata->num_leds;
} else {
- priv = led_pwm_create_of(pdev);
- if (!priv)
- return -ENODEV;
+ ret = led_pwm_create_of(&pdev->dev, priv);
+ }
+
+ if (ret) {
+ led_pwm_cleanup(priv);
+ return ret;
}
platform_set_drvdata(pdev, priv);
return 0;
-
-err:
- while (i--)
- led_classdev_unregister(&priv->leds[i].cdev);
-
- return ret;
}
static int led_pwm_remove(struct platform_device *pdev)
{
struct led_pwm_priv *priv = platform_get_drvdata(pdev);
- int i;
- for (i = 0; i < priv->num_leds; i++) {
- led_classdev_unregister(&priv->leds[i].cdev);
- if (priv->leds[i].can_sleep)
- cancel_work_sync(&priv->leds[i].work);
- }
+ led_pwm_cleanup(priv);
return 0;
}
.remove = led_pwm_remove,
.driver = {
.name = "leds_pwm",
- .owner = THIS_MODULE,
- .of_match_table = of_match_ptr(of_pwm_leds_match),
+ .of_match_table = of_pwm_leds_match,
},
};
projects / firefly-linux-kernel-4.4.55.git / blobdiff