linux-kernel - Re: [PATCH v2 1/3] power_supply: Add power

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Date:	Sun, 1 Dec 2013 14:23:30 -0800
From:	Anton Vorontsov <anton@...msg.org>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	freemangordon@....bg, aaro.koskinen@....fi, pavel@....cz,
	Jenny TC <jenny.tc@...el.com>
Subject: Re: [PATCH v2 1/3] power_supply: Add power_supply notifier

On Tue, Nov 19, 2013 at 11:18:03AM +0100, Pali Rohár wrote:
> This patch adds a notifier chain to the power_supply.
> This notifier helps drivers in other subsystem to listen to
> changes in power supply subsystem. This would help to take some
> actions in those drivers on changing the power supply properties.
> One such scenario is to increase/decrease system performance based
> on the battery capacity/voltage. Another scenario is to adjust the
> h/w peak current detection voltage/current thresholds based on battery
> voltage/capacity. The notifier helps drivers to listen to changes
> in power_suppy susbystem without polling the power_supply properties
> 
> Signed-off-by: Jenny TC <jenny.tc@...el.com>
> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
...
> +enum power_supply_notifier_events {
> +	PSY_EVENT_NONE,

This one is not needed.

> +	PSY_EVENT_PROP_CHANGED,
> +	PSY_EVENT_BATTERY,
> +	PSY_EVENT_CABLE,
> +};

The only event that is currently used in your patch series is
EVENT_PROP_CHANGED... So, I applied the patch with the following changes:

diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index c6f52c0..0c2a260 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/device.h>
+#include <linux/notifier.h>
 #include <linux/err.h>
 #include <linux/power_supply.h>
 #include <linux/thermal.h>
@@ -159,10 +159,7 @@ enum power_supply_type {
 };
 
 enum power_supply_notifier_events {
-	PSY_EVENT_NONE,
 	PSY_EVENT_PROP_CHANGED,
-	PSY_EVENT_BATTERY,
-	PSY_EVENT_CABLE,
 };
 
 union power_supply_propval {
@@ -242,7 +239,7 @@ struct power_supply_info {
 	int use_for_apm;
 };
 
-extern struct atomic_notifier_head    power_supply_notifier;
+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);
--
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