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Subject[PATCH 3/3] max17042_battery: Make it possible to instantiate driver from DT
Allow both device tree (preferred) and platform data-based driver
instantiation.

Signed-off-by: Karol Lewandowski <k.lewandowsk@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
.../bindings/power_supply/max17042_battery.txt | 18 ++++++++
drivers/power/max17042_battery.c | 45 ++++++++++++++++++--
2 files changed, 59 insertions(+), 4 deletions(-)
create mode 100644 Documentation/devicetree/bindings/power_supply/max17042_battery.txt
diff --git a/Documentation/devicetree/bindings/power_supply/max17042_battery.txt b/Documentation/devicetree/bindings/power_supply/max17042_battery.txt
new file mode 100644
index 0000000..5bc9b68
--- /dev/null
+++ b/Documentation/devicetree/bindings/power_supply/max17042_battery.txt
@@ -0,0 +1,18 @@
+max17042_battery
+~~~~~~~~~~~~~~~~
+
+Required properties :
+ - compatible : "maxim,max17042"
+
+Optional properties :
+ - maxim,rsns-microohm : Resistance of rsns resistor in micro Ohms
+ (datasheet-recommended value is 10000).
+ Defining this property enables current-sense functionality.
+
+Example:
+
+ battery-charger@36 {
+ compatible = "maxim,max17042";
+ reg = <0x36>;
+ maxim,rsns-microohm = <10000>;
+ };
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
index 49c1377..aec883b 100644
--- a/drivers/power/max17042_battery.c
+++ b/drivers/power/max17042_battery.c
@@ -29,6 +29,7 @@
#include <linux/mod_devicetable.h>
#include <linux/power_supply.h>
#include <linux/power/max17042_battery.h>
+#include <linux/of.h>

struct max17042_chip {
struct i2c_client *client;
@@ -211,6 +212,31 @@ static int max17042_get_property(struct power_supply *psy,
return 0;
}

+#ifdef CONFIG_OF
+static int max17042_dt_parse(struct max17042_chip *chip, struct device_node *np)
+{
+ u32 prop;
+
+ if (!np)
+ return -EINVAL;
+
+ /* require current sense resistor value to be specified for
+ current-sense functionality to be enabled at all */
+ if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
+ chip->r_sns = prop;
+ chip->enable_current_sense = true;
+ } else
+ chip->enable_current_sense = false;
+
+ return 0;
+}
+#else
+static int max17042_dt_parse(struct max17042_chip *chip, struct device_node *np)
+{
+ return -EINVAL;
+}
+#endif
+
static int __devinit max17042_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -237,12 +263,14 @@ static int __devinit max17042_probe(struct i2c_client *client,
chip->battery.properties = max17042_battery_props;
chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);

- if (pdata) {
+ ret = max17042_dt_parse(chip, client->dev.of_node);
+ if (ret < 0) {
+ if (!pdata) {
+ dev_warn(&client->dev, "no driver data provided\n");
+ return -ENODEV;
+ }
chip->r_sns = pdata->r_sns;
chip->enable_current_sense = pdata->enable_current_sense;
- } else {
- dev_warn(&client->dev, "no driver data provided\n");
- return -ENODEV;
}

/* When current is not measured,
@@ -281,6 +309,14 @@ static int __devexit max17042_remove(struct i2c_client *client)
return 0;
}

+#ifdef CONFIG_OF
+static const struct of_device_id max17042_dt_match[] = {
+ { .compatible = "maxim,max17042" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, max17042_dt_match);
+#endif
+
static const struct i2c_device_id max17042_id[] = {
{ "max17042", 0 },
{ }
@@ -290,6 +326,7 @@ MODULE_DEVICE_TABLE(i2c, max17042_id);
static struct i2c_driver max17042_i2c_driver = {
.driver = {
.name = "max17042",
+ .of_match_table = of_match_ptr(max17042_dt_match),
},
.probe = max17042_probe,
.remove = __devexit_p(max17042_remove),
--
1.7.8.3


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