linux-kernel - [PATCH 1/5] input: make i2c device id constant

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Date:	Sat, 09 Jan 2010 13:55:47 +0100
From:	Németh Márton <nm127@...email.hu>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Raphael Derosso Pereira <raphaelpereira@...il.com>,
	Kwangwoo Lee <kwlee@...kvision.com>,
	Stephen Hemminger <shemminger@...ux-foundation.org>
CC:	Jochen Eisinger <jochen@...guin-breeder.org>,
	linux-input@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/5] input: make i2c device id constant

From: Márton Németh <nm127@...email.hu>

The id_table field of the struct i2c_driver is constant in <linux/i2c.h>
so it is worth to make the initialization data also constant.

The semantic match that finds this kind of pattern is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
disable decl_init,const_decl_init;
identifier I1, I2, x;
@@
	struct I1 {
	  ...
	  const struct I2 *x;
	  ...
	};
@s@
identifier r.I1, y;
identifier r.x, E;
@@
	struct I1 y = {
	  .x = E,
	};
@c@
identifier r.I2;
identifier s.E;
@@
	const struct I2 E[] = ... ;
@depends on !c@
identifier r.I2;
identifier s.E;
@@
+	const
	struct I2 E[] = ...;
// </smpl>

Signed-off-by: Márton Németh <nm127@...email.hu>
Cc: Julia Lawall <julia@...u.dk>
Cc: cocci@...u.dk
---
diff -u -p a/drivers/input/keyboard/qt2160.c b/drivers/input/keyboard/qt2160.c
--- a/drivers/input/keyboard/qt2160.c 2009-12-03 04:51:21.000000000 +0100
+++ b/drivers/input/keyboard/qt2160.c 2010-01-08 19:01:56.000000000 +0100
@@ -362,7 +362,7 @@ static int __devexit qt2160_remove(struc
 	return 0;
 }

-static struct i2c_device_id qt2160_idtable[] = {
+static const struct i2c_device_id qt2160_idtable[] = {
 	{ "qt2160", 0, },
 	{ }
 };
diff -u -p a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
--- a/drivers/input/touchscreen/tsc2007.c 2009-12-03 04:51:21.000000000 +0100
+++ b/drivers/input/touchscreen/tsc2007.c 2010-01-08 19:15:29.000000000 +0100
@@ -358,7 +358,7 @@ static int __devexit tsc2007_remove(stru
 	return 0;
 }

-static struct i2c_device_id tsc2007_idtable[] = {
+static const struct i2c_device_id tsc2007_idtable[] = {
 	{ "tsc2007", 0 },
 	{ }
 };
diff -u -p a/drivers/input/misc/apanel.c b/drivers/input/misc/apanel.c
--- a/drivers/input/misc/apanel.c 2009-12-03 04:51:21.000000000 +0100
+++ b/drivers/input/misc/apanel.c 2010-01-08 19:22:03.000000000 +0100
@@ -149,7 +149,7 @@ static void apanel_shutdown(struct i2c_c
 	apanel_remove(client);
 }

-static struct i2c_device_id apanel_id[] = {
+static const struct i2c_device_id apanel_id[] = {
 	{ "fujitsu_apanel", 0 },
 	{ }
 };
--
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