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leds: lp5521: add support for Device Tree bindings

Message ID 1366055212-15350-1-git-send-email-linus.walleij@stericsson.com
State New
Headers show

Commit Message

Linus Walleij April 15, 2013, 7:46 p.m. UTC 
From: Gabriel Fernandez <gabriel.fernandez@stericsson.com>

This patch allows the lp5521 driver to be successfully probed and
initialised when Device Tree support is enabled.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 .../devicetree/bindings/leds/leds-lp55xx.txt       | 22 ++++++++
 drivers/leds/leds-lp5521.c                         | 61 ++++++++++++++++++++--
 2 files changed, 78 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-lp55xx.txt
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Patch

diff --git a/Documentation/devicetree/bindings/leds/leds-lp55xx.txt b/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
new file mode 100644
index 0000000..893284b
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-lp55xx.txt
@@ -0,0 +1,22 @@ 
+Binding for LP55xx Led Driver
+
+Required properties:
+- compatible: "lp5521" or "lp5523"
+- label: Used for naming LEDs
+- num-chanel: Number of LED channels
+- led-cur: Current setting at each led channel (mA x10, 0 if led is not connected)
+- max-cur: Maximun current at each led channel.
+- clock-mode: Input clock mode, (0: automode, 1: internal, 2: external)
+
+example:
+
+lp5521@32 {
+		compatible = "lp5521";
+		reg = <0x32>;
+		label = "lp5521_pri";
+		num-chanel = /bits/ 8 <3>;
+		led-cur = /bits/ 8 <0x2f 0x2f 0x2f>;
+		max-cur = /bits/ 8 <0x5f 0x5f 0x5f>;
+
+		clock-mode = /bits/8 <2>;
+};
diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 1001347..87c8254 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -31,6 +31,7 @@ 
 #include <linux/mutex.h>
 #include <linux/platform_data/leds-lp55xx.h>
 #include <linux/slab.h>
+#include <linux/of.h>
 
 #include "leds-lp55xx-common.h"
 
@@ -394,18 +395,68 @@  static struct lp55xx_device_config lp5521_cfg = {
 	.dev_attr_group     = &lp5521_group,
 };
 
+static int lp5521_of_probe(struct device *dev,
+		struct device_node *np)
+{
+	struct lp55xx_platform_data *pdata;
+	u8 led_cur[3];
+	u8 max_cur[3];
+	u8 clock_mode;
+	u8 num_channel;
+	const char *label;
+	struct lp55xx_led_config *led_config;
+	int i;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	of_property_read_u8(np, "num-chanel", &num_channel);
+	of_property_read_u8_array(np, "led-cur", led_cur, num_channel);
+	of_property_read_u8_array(np, "max-cur", max_cur, num_channel);
+	of_property_read_string(np, "label", &label);
+	of_property_read_u8_array(np, "clock-mode", &clock_mode, 1);
+
+	led_config = devm_kzalloc(dev, sizeof(*led_config) * num_channel,
+				  GFP_KERNEL);
+	if (!led_config)
+		return -ENOMEM;
+
+	for (i = 0; i < num_channel; i++) {
+		led_config[i].chan_nr = i;
+		led_config[i].led_current = led_cur[i];
+		led_config[i].max_current = max_cur[i];
+	}
+	pdata->label = kzalloc(sizeof(char) * 32, GFP_KERNEL);
+	strcpy((char *)pdata->label, (char *) label);
+	pdata->led_config = &led_config[0];
+	pdata->num_channels = num_channel;
+	pdata->clock_mode = clock_mode;
+	dev->platform_data = pdata;
+
+	return 0;
+}
+
 static int lp5521_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	int ret;
 	struct lp55xx_chip *chip;
 	struct lp55xx_led *led;
-	struct lp55xx_platform_data *pdata = client->dev.platform_data;
-
-	if (!pdata) {
-		dev_err(&client->dev, "no platform data\n");
-		return -EINVAL;
+	struct lp55xx_platform_data *pdata;
+	struct device_node *np = client->dev.of_node;
+
+	if (!client->dev.platform_data) {
+		if (np) {
+			ret = lp5521_of_probe(&client->dev, np);
+			if (ret < 0)
+				return ret;
+		} else {
+			dev_err(&client->dev, "no platform data\n");
+			return -EINVAL;
+		}
 	}
+	pdata = client->dev.platform_data;
 
 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)