1 files changed, 111 insertions, 41 deletions

diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c
index 2157524f277..a1ea5f6a8d3 100644
--- a/drivers/leds/leds-pwm.c
+++ b/drivers/leds/leds-pwm.c
@@ -16,6 +16,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
+#include <linux/of_platform.h>
 #include <linux/fb.h>
 #include <linux/leds.h>
 #include <linux/err.h>
@@ -30,6 +31,11 @@ struct led_pwm_data {
 	unsigned int		period;
 };
 
+struct led_pwm_priv {
+	int num_leds;
+	struct led_pwm_data leds[0];
+};
+
 static void led_pwm_set(struct led_classdev *led_cdev,
 	enum led_brightness brightness)
 {
@@ -47,88 +53,152 @@ static void led_pwm_set(struct led_classdev *led_cdev,
 	}
 }
 
-static int led_pwm_probe(struct platform_device *pdev)
+static inline size_t sizeof_pwm_leds_priv(int num_leds)
 {
-	struct led_pwm_platform_data *pdata = pdev->dev.platform_data;
-	struct led_pwm *cur_led;
-	struct led_pwm_data *leds_data, *led_dat;
-	int i, ret = 0;
+	return sizeof(struct led_pwm_priv) +
+		      (sizeof(struct led_pwm_data) * num_leds);
+}
+
+static struct led_pwm_priv *led_pwm_create_of(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct device_node *child;
+	struct led_pwm_priv *priv;
+	int count, ret;
 
-	if (!pdata)
-		return -EBUSY;
+	/* count LEDs in this device, so we know how much to allocate */
+	count = of_get_child_count(node);
+	if (!count)
+		return NULL;
 
-	leds_data = devm_kzalloc(&pdev->dev,
-			sizeof(struct led_pwm_data) * pdata->num_leds,
-				GFP_KERNEL);
-	if (!leds_data)
-		return -ENOMEM;
+	priv = devm_kzalloc(&pdev->dev, sizeof_pwm_leds_priv(count),
+			    GFP_KERNEL);
+	if (!priv)
+		return NULL;
 
-	for (i = 0; i < pdata->num_leds; i++) {
-		cur_led = &pdata->leds[i];
-		led_dat = &leds_data[i];
+	for_each_child_of_node(node, child) {
+		struct led_pwm_data *led_dat = &priv->leds[priv->num_leds];
 
-		led_dat->pwm = pwm_request(cur_led->pwm_id,
-				cur_led->name);
+		led_dat->cdev.name = of_get_property(child, "label",
+						     NULL) ? : child->name;
+
+		led_dat->pwm = devm_of_pwm_get(&pdev->dev, child, NULL);
 		if (IS_ERR(led_dat->pwm)) {
-			ret = PTR_ERR(led_dat->pwm);
-			dev_err(&pdev->dev, "unable to request PWM %d\n",
-					cur_led->pwm_id);
+			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);
+
+		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);
 
-		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;
 
 		ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
 		if (ret < 0) {
-			pwm_free(led_dat->pwm);
+			dev_err(&pdev->dev, "failed to register for %s\n",
+				led_dat->cdev.name);
+			of_node_put(child);
 			goto err;
 		}
+		priv->num_leds++;
 	}
 
-	platform_set_drvdata(pdev, leds_data);
+	return priv;
+err:
+	while (priv->num_leds--)
+		led_classdev_unregister(&priv->leds[priv->num_leds].cdev);
 
-	return 0;
+	return NULL;
+}
 
-err:
-	if (i > 0) {
-		for (i = i - 1; i >= 0; i--) {
-			led_classdev_unregister(&leds_data[i].cdev);
-			pwm_free(leds_data[i].pwm);
+static int led_pwm_probe(struct platform_device *pdev)
+{
+	struct led_pwm_platform_data *pdata = pdev->dev.platform_data;
+	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;
+
+			ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
+			if (ret < 0)
+				goto err;
 		}
+		priv->num_leds = pdata->num_leds;
+	} else {
+		priv = led_pwm_create_of(pdev);
+		if (!priv)
+			return -ENODEV;
 	}
 
+	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;
-	struct led_pwm_platform_data *pdata = pdev->dev.platform_data;
-	struct led_pwm_data *leds_data;
 
-	leds_data = platform_get_drvdata(pdev);
-
-	for (i = 0; i < pdata->num_leds; i++) {
-		led_classdev_unregister(&leds_data[i].cdev);
-		pwm_free(leds_data[i].pwm);
-	}
+	for (i = 0; i < priv->num_leds; i++)
+		led_classdev_unregister(&priv->leds[i].cdev);
 
 	return 0;
 }
 
+static const struct of_device_id of_pwm_leds_match[] = {
+	{ .compatible = "pwm-leds", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, of_pwm_leds_match);
+
 static struct platform_driver led_pwm_driver = {
 	.probe		= led_pwm_probe,
 	.remove		= led_pwm_remove,
 	.driver		= {
 		.name	= "leds_pwm",
 		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(of_pwm_leds_match),
 	},
 };