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Date: Thu, 15 Aug 2013 02:09:58 +0300 From: Philippe De Swert <philippe.deswert@...lamobile.com> To: anton@...msg.org, dwmw2@...radead.org, linux-kernel@...r.kernel.org Cc: Philippe De Swert <philippe.deswert@...lamobile.com> Subject: [PATCH] power:power_supply_syfs : Treat PROP_TYPE as a regular attribute first These days we often have USB powered devices. This means that often the type is variable. Common examples are smartphones which can be charged through a normal USB port on a PC/laptop, a dedicated charger, etc... Often those chips also have support for other charger types like a mains/DC charger. This means that often there are several psy structures in the driver and makes it impossible to stick to just one type. Userspace sometimes needs to behave differently based on the type of charger connected to such devices. This goes from loading gadget drivers to get enumerated on a PC/laptop to draw more power, to enabling special charging functions for a dedicated charger. Or to just enable userspace to discriminate between the two for charging indications/USB cable detection. Moreover TYPE seems to be the right attribute to use as it has definitions already for all the different USB charger types.This patch allows for using the regular get_property function with the TYPE property without breaking current functionality/way of working. Signed-off-by: Philippe De Swert <philippe.deswert@...lamobile.com> --- drivers/power/power_supply_sysfs.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c index 29178f7..a839c91 100644 --- a/drivers/power/power_supply_sysfs.c +++ b/drivers/power/power_supply_sysfs.c @@ -73,19 +73,20 @@ static ssize_t power_supply_show_property(struct device *dev, const ptrdiff_t off = attr - power_supply_attrs; union power_supply_propval value; - if (off == POWER_SUPPLY_PROP_TYPE) - value.intval = psy->type; - else - ret = psy->get_property(psy, off, &value); + ret = psy->get_property(psy, off, &value); if (ret < 0) { - if (ret == -ENODATA) - dev_dbg(dev, "driver has no data for `%s' property\n", - attr->attr.name); - else if (ret != -ENODEV) - dev_err(dev, "driver failed to report `%s' property: %zd\n", - attr->attr.name, ret); - return ret; + if (off == POWER_SUPPLY_PROP_TYPE) + value.intval = psy->type; + else { + if (ret == -ENODATA) + dev_dbg(dev, "driver has no data for `%s' property\n", + attr->attr.name); + else if (ret != -ENODEV) + dev_err(dev, "driver failed to report `%s' property: %zd\n", + attr->attr.name, ret); + return ret; + } } if (off == POWER_SUPPLY_PROP_STATUS) -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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