power: gpio-charger: add device tree support

Add the ability to parse gpio-charger data from a devicetree node.

Signed-off-by: Heiko Stuebner <heiko.stuebner@bq.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>

diff --git a/drivers/power/gpio-charger.c b/drivers/power/gpio-charger.c
index 7536933..df984ec 100644 (file)
--- a/drivers/power/gpio-charger.c
+++ b/drivers/power/gpio-charger.c
@@ -22,6 +22,8 @@
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
 
 #include <linux/power/gpio-charger.h>
 
@@ -69,6 +71,59 @@ static enum power_supply_property gpio_charger_properties[] = {
        POWER_SUPPLY_PROP_ONLINE,
 };
 
+static
+struct gpio_charger_platform_data *gpio_charger_parse_dt(struct device *dev)
+{
+       struct device_node *np = dev->of_node;
+       struct gpio_charger_platform_data *pdata;
+       const char *chargetype;
+       enum of_gpio_flags flags;
+       int ret;
+
+       if (!np)
+               return ERR_PTR(-ENOENT);
+
+       pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+       if (!pdata)
+               return ERR_PTR(-ENOMEM);
+
+       pdata->name = np->name;
+
+       pdata->gpio = of_get_gpio_flags(np, 0, &flags);
+       if (pdata->gpio < 0) {
+               if (pdata->gpio != -EPROBE_DEFER)
+                       dev_err(dev, "could not get charger gpio\n");
+               return ERR_PTR(pdata->gpio);
+       }
+
+       pdata->gpio_active_low = !!(flags & OF_GPIO_ACTIVE_LOW);
+
+       pdata->type = POWER_SUPPLY_TYPE_UNKNOWN;
+       ret = of_property_read_string(np, "charger-type", &chargetype);
+       if (ret >= 0) {
+               if (!strncmp("unknown", chargetype, 7))
+                       pdata->type = POWER_SUPPLY_TYPE_UNKNOWN;
+               else if (!strncmp("battery", chargetype, 7))
+                       pdata->type = POWER_SUPPLY_TYPE_BATTERY;
+               else if (!strncmp("ups", chargetype, 3))
+                       pdata->type = POWER_SUPPLY_TYPE_UPS;
+               else if (!strncmp("mains", chargetype, 5))
+                       pdata->type = POWER_SUPPLY_TYPE_MAINS;
+               else if (!strncmp("usb-sdp", chargetype, 7))
+                       pdata->type = POWER_SUPPLY_TYPE_USB;
+               else if (!strncmp("usb-dcp", chargetype, 7))
+                       pdata->type = POWER_SUPPLY_TYPE_USB_DCP;
+               else if (!strncmp("usb-cdp", chargetype, 7))
+                       pdata->type = POWER_SUPPLY_TYPE_USB_CDP;
+               else if (!strncmp("usb-aca", chargetype, 7))
+                       pdata->type = POWER_SUPPLY_TYPE_USB_ACA;
+               else
+                       dev_warn(dev, "unknown charger type %s\n", chargetype);
+       }
+
+       return pdata;
+}
+
 static int gpio_charger_probe(struct platform_device *pdev)
 {
        const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
@@ -78,8 +133,13 @@ static int gpio_charger_probe(struct platform_device *pdev)
        int irq;
 
        if (!pdata) {
-               dev_err(&pdev->dev, "No platform data\n");
-               return -EINVAL;
+               pdata = gpio_charger_parse_dt(&pdev->dev);
+               if (IS_ERR(pdata)) {
+                       ret = PTR_ERR(pdata);
+                       if (ret != -EPROBE_DEFER)
+                               dev_err(&pdev->dev, "No platform data\n");
+                       return ret;
+               }
        }
 
        if (!gpio_is_valid(pdata->gpio)) {
@@ -103,6 +163,7 @@ static int gpio_charger_probe(struct platform_device *pdev)
        charger->get_property = gpio_charger_get_property;
        charger->supplied_to = pdata->supplied_to;
        charger->num_supplicants = pdata->num_supplicants;
+       charger->of_node = pdev->dev.of_node;
 
        ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
        if (ret) {
@@ -189,6 +250,12 @@ static int gpio_charger_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
                gpio_charger_suspend, gpio_charger_resume);
 
+static const struct of_device_id gpio_charger_match[] = {
+       { .compatible = "gpio-charger" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, gpio_charger_match);
+
 static struct platform_driver gpio_charger_driver = {
        .probe = gpio_charger_probe,
        .remove = gpio_charger_remove,
@@ -196,6 +263,7 @@ static struct platform_driver gpio_charger_driver = {
                .name = "gpio-charger",
                .owner = THIS_MODULE,
                .pm = &gpio_charger_pm_ops,
+               .of_match_table = gpio_charger_match,
        },
 };