From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760941AbYAaP0g (ORCPT ); Thu, 31 Jan 2008 10:26:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753082AbYAaP02 (ORCPT ); Thu, 31 Jan 2008 10:26:28 -0500 Received: from mail.gmx.net ([213.165.64.20]:37951 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751786AbYAaP02 (ORCPT ); Thu, 31 Jan 2008 10:26:28 -0500 X-Authenticated: #20450766 X-Provags-ID: V01U2FsdGVkX1/wXXwltN3wSc2tE6hXNSLzhNR7zKvFFBuLITMjyN mLVFs3MWUxGclU Date: Thu, 31 Jan 2008 16:26:39 +0100 (CET) From: Guennadi Liakhovetski X-X-Sender: lyakh@axis700.grange To: linux-kernel@vger.kernel.org cc: David Brownell , i2c@lm-sensors.org Subject: [PATCH] Define a NO_GPIO macro to compare against and to use as an invalid GPIO Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As discussed on i2c mailing list with David Brownell, and number outside of the 0...MAX_INT range is invalid as a GPIO number. Define a macro, similar to NO_IRQ, to be used as a deliberate invalid GPIO, rather than defining a is_valid_gpio() macro. Signed-off-by: Guennadi Liakhovetski --- As gpiolib doesn't seem to have an own mailing list, sending it directly to LKML. include/asm-generic/gpio.h | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index f29a502..806b86c 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -16,6 +16,10 @@ #define ARCH_NR_GPIOS 256 #endif +#ifndef NO_GPIO +#define NO_GPIO ((unsigned int)-1) +#endif + struct seq_file; /** -- 1.5.3.4