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>

1 files changed, 70 insertions, 2 deletions

diff --git a/drivers/power/gpio-charger.c b/drivers/power/gpio-charger.c
index 7536933d0ab9..df984ecad1cc 100644
--- 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,
         },
 };