power: supply: axp288_charger: Do not bind when the charge function is not used

Some devices with an AXP288 PMIC do not have a battery at all, or use
external charger and fuelgauge ICs instead of the AXP288 builtin
functionality.

On such devices we should not bind to the charge function to avoid
exporting a non working power_supply class device.

Cc: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>

diff --git a/drivers/power/supply/axp288_charger.c b/drivers/power/supply/axp288_charger.c
index 6982927..6e1bc14 100644 (file)
--- a/drivers/power/supply/axp288_charger.c
+++ b/drivers/power/supply/axp288_charger.c
@@ -747,6 +747,18 @@ static int axp288_charger_probe(struct platform_device *pdev)
        struct device *dev = &pdev->dev;
        struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
        struct power_supply_config charger_cfg = {};
+       unsigned int val;
+
+       /*
+        * On some devices the fuelgauge and charger parts of the axp288 are
+        * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
+        */
+       ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
+       if (ret < 0)
+               return ret;
+       if (val == 0)
+               return -ENODEV;
+
        info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
        if (!info)
                return -ENOMEM;