linux-kernel - [PATCH v4 01/20] power_supply: Add driver private data

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Message-id: <1424692061-30624-2-git-send-email-k.kozlowski@samsung.com>
Date:	Mon, 23 Feb 2015 12:47:22 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>, Jiri Kosina <jkosina@...e.cz>,
	David Herrmann <dh.herrmann@...glemail.com>,
	Cezary Jackiewicz <cezary.jackiewicz@...il.com>,
	Darren Hart <dvhart@...radead.org>,
	Support Opensource <support.opensource@...semi.com>,
	Milo Kim <milo.kim@...com>,
	Julian Andres Klode <jak@...-linux.org>,
	Marc Dietrich <marvin24@....de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-acpi@...r.kernel.org, linux-input@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	patches@...nsource.wolfsonmicro.com, ac100@...ts.launchpad.net,
	linux-tegra@...r.kernel.org, devel@...verdev.osuosl.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Pavel Machek <pavel@....cz>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: [PATCH v4 01/20] power_supply: Add driver private data

Allow drivers to store private data inside power_supply structure for
later usage in power supply operations.

Usage of driver private data is necessary to access driver's state
container object from power supply calls (like get_property()) if struct
'power_supply' is a stored there as a pointer, for example:

struct some_driver_info {
	struct i2c_client       *client;
	struct power_supply     *power_supply;
	...
}

In such case one cannot use container_of() and must store pointer to
state container as private data.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Reviewed-by: Sebastian Reichel <sre@...nel.org>
Acked-by: Pavel Machek <pavel@....cz>
---
 drivers/power/power_supply_core.c | 6 ++++++
 include/linux/power_supply.h      | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 694e8cddd5c1..84ef3f40e7bf 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -629,6 +629,12 @@ void power_supply_unregister(struct power_supply *psy)
 }
 EXPORT_SYMBOL_GPL(power_supply_unregister);
 
+void *power_supply_get_drvdata(struct power_supply *psy)
+{
+	return psy->drv_data;
+}
+EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
+
 static int __init power_supply_class_init(void)
 {
 	power_supply_class = class_create(THIS_MODULE, "power_supply");
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 096dbced02ac..a5743f24e03e 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -209,6 +209,9 @@ struct power_supply {
 	/* For APM emulation, think legacy userspace. */
 	int use_for_apm;
 
+	/* Driver private data */
+	void *drv_data;
+
 	/* private */
 	struct device *dev;
 	struct work_struct changed_work;
@@ -281,6 +284,7 @@ extern int power_supply_register_no_ws(struct device *parent,
 extern void power_supply_unregister(struct power_supply *psy);
 extern int power_supply_powers(struct power_supply *psy, struct device *dev);
 
+extern void *power_supply_get_drvdata(struct power_supply *psy);
 /* For APM emulation, think legacy userspace. */
 extern struct class *power_supply_class;
 
-- 
1.9.1

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