[PATCH v2 11/13] extcon: extcon-adc-jack: add devicetree support

[Robert Baldyga <r.baldyga@samsung.com>]

This patch modifies extcon-adc-jack driver to use initialization data from
devicetree, when platform data is not available. It allows to define cable list
with ADC value ranges for each of them in devicetree bindings.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
---
 drivers/extcon/extcon-adc-jack.c |   81 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/drivers/extcon/extcon-adc-jack.c b/drivers/extcon/extcon-adc-jack.c
index d65915e..f1a1399 100644
--- a/drivers/extcon/extcon-adc-jack.c
+++ b/drivers/extcon/extcon-adc-jack.c
@@ -21,6 +21,7 @@
 #include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/workqueue.h>
+#include <linux/of.h>
 #include <linux/iio/consumer.h>
 #include <linux/extcon/extcon-adc-jack.h>
 #include <linux/extcon.h>
@@ -92,12 +93,85 @@ static irqreturn_t adc_jack_irq_thread(int irq, void *_data)
 	return IRQ_HANDLED;
 }
 
+#ifdef CONFIG_OF
+static struct adc_jack_pdata *get_pdata_from_dt(struct device *dev)
+{
+	int ret, cnt, i;
+	struct device_node *cables_np, *child;
+	struct adc_jack_pdata *pdata =
+			devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+
+	ret = of_property_read_string_index(dev->of_node,
+			"adc-name", 0, &pdata->name);
+	if (ret)
+		return NULL;
+
+	ret = of_property_read_string_index(dev->of_node,
+			"adc-consumer-channel", 0, &pdata->consumer_channel);
+	if (ret)
+		return NULL;
+
+	cables_np = of_find_node_by_name(dev->of_node, "cables");
+	if (!cables_np)
+		return NULL;
+
+	cnt = of_get_child_count(cables_np);
+	if (cnt <= 0)
+		return NULL;
+
+	pdata->cable_names = devm_kcalloc(dev, cnt+1,
+			sizeof(*pdata->cable_names), GFP_KERNEL);
+	if (!pdata->cable_names)
+		return NULL;
+
+	pdata->adc_conditions = devm_kcalloc(dev, cnt+1,
+			sizeof(*pdata->adc_conditions), GFP_KERNEL);
+	if (!pdata->adc_conditions)
+		return NULL;
+
+	i = 0;
+	for_each_child_of_node(cables_np, child) {
+		ret = of_property_read_string_index(child,
+				"cable-name", 0, &pdata->cable_names[i]);
+		if (ret)
+			return NULL;
+
+		pdata->adc_conditions[i].state = (1<<i);
+
+		ret = of_property_read_u32_array(child, "adc-min",
+				&pdata->adc_conditions[i].min_adc, 0);
+		if (ret)
+			return NULL;
+
+		ret = of_property_read_u32_array(child, "adc-max",
+				&pdata->adc_conditions[i].max_adc, 0);
+		if (ret)
+			return NULL;
+
+		i++;
+	}
+
+	return pdata;
+}
+#else
+static struct adc_jack_pdata *get_pdata_from_dt(struct device *dev)
+{
+	return NULL;
+}
+#endif /* CONFIG_OF */
+
 static int adc_jack_probe(struct platform_device *pdev)
 {
 	struct adc_jack_data *data;
 	struct adc_jack_pdata *pdata = dev_get_platdata(&pdev->dev);
 	int i, err = 0;
 
+	if (!pdata) {
+		pdata = get_pdata_from_dt(&pdev->dev);
+		if (!pdata)
+			return -EINVAL;
+	}
+
 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
@@ -188,11 +262,18 @@ static int adc_jack_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static struct of_device_id of_adc_jack_match_tbl[] = {
+	{ .compatible = "extcon-adc-jack", },
+	{ /* end */ },
+};
+
+
 static struct platform_driver adc_jack_driver = {
 	.probe          = adc_jack_probe,
 	.remove         = adc_jack_remove,
 	.driver         = {
 		.name   = "adc-jack",
+		.of_match_table = of_adc_jack_match_tbl,
 		.owner  = THIS_MODULE,
 	},
 };
-- 
1.7.9.5