linux-kernel - Re: [PATCH 1/3] power_supply: add power_supply_get_by

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Date:	Mon, 23 Dec 2013 18:20:36 -0800
From:	Anton Vorontsov <anton@...msg.org>
To:	Sebastian Reichel <sre@...ian.org>
Cc:	Sebastian Reichel <sre@...g0.de>,
	David Woodhouse <dwmw2@...radead.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>,
	freemangordon@....bg, aaro.koskinen@....fi, pavel@....cz
Subject: Re: [PATCH 1/3] power_supply: add power_supply_get_by_phandle

On Sun, Nov 24, 2013 at 05:49:29PM +0100, Sebastian Reichel wrote:
> Add method to get power supply by device tree phandle.
> 
> Signed-off-by: Sebastian Reichel <sre@...ian.org>
> ---
>  drivers/power/power_supply_core.c | 24 ++++++++++++++++++++++++
>  include/linux/power_supply.h      |  2 ++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
> index 08bce22..99e4b41 100644
> --- a/drivers/power/power_supply_core.c
> +++ b/drivers/power/power_supply_core.c
> @@ -340,6 +340,30 @@ struct power_supply *power_supply_get_by_name(const char *name)
...
> +
> +	dev = class_find_device(power_supply_class, NULL, power_supply_np,
> +						power_supply_match_device_node);
> +
> +	of_node_put(power_supply_np);
> +
> +	return dev ? dev_get_drvdata(dev) : NULL;
> +}
> +EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);

The code had no !CONFIG_OF protection so I had to make the following
changes to this patch:

diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 23cd055..2660664 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -341,6 +341,7 @@ struct power_supply *power_supply_get_by_name(const char *name)
 }
 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
 
+#ifdef CONFIG_OF
 static int power_supply_match_device_node(struct device *dev, const void *data)
 {
 	return dev->parent && dev->parent->of_node == data;
@@ -364,6 +365,7 @@ struct power_supply *power_supply_get_by_phandle(struct device_node *np,
 	return dev ? dev_get_drvdata(dev) : NULL;
 }
 EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
+#endif /* CONFIG_OF */
 
 int power_supply_powers(struct power_supply *psy, struct device *dev)
 {
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 8d06537..c9dc4e0 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -244,8 +244,14 @@ extern struct atomic_notifier_head power_supply_notifier;
 extern int power_supply_reg_notifier(struct notifier_block *nb);
 extern void power_supply_unreg_notifier(struct notifier_block *nb);
 extern struct power_supply *power_supply_get_by_name(const char *name);
+#ifdef CONFIG_OF
 extern struct power_supply *power_supply_get_by_phandle(struct device_node *np,
 							const char *property);
+#else /* !CONFIG_OF */
+static inline struct power_supply *
+power_supply_get_by_phandle(struct device_node *np, const char *property)
+{ return NULL; }
+#endif /* CONFIG_OF */
 extern void power_supply_changed(struct power_supply *psy);
 extern int power_supply_am_i_supplied(struct power_supply *psy);
 extern int power_supply_set_battery_charged(struct power_supply *psy);
--
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