From patchwork Tue Aug 4 09:27:04 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Pargmann X-Patchwork-Id: 503450 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 253D71402C8 for ; Tue, 4 Aug 2015 19:27:14 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932558AbbHDJ1N (ORCPT ); Tue, 4 Aug 2015 05:27:13 -0400 Received: from metis.ext.pengutronix.de ([92.198.50.35]:46057 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932395AbbHDJ1M (ORCPT ); Tue, 4 Aug 2015 05:27:12 -0400 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1ZMWdx-0007wd-C8; Tue, 04 Aug 2015 09:28:13 +0200 Received: from mpa by dude.hi.pengutronix.de with local (Exim 4.86_RC4) (envelope-from ) id 1ZMYV3-0000VN-Rv; Tue, 04 Aug 2015 11:27:09 +0200 From: Markus Pargmann To: Linus Walleij Cc: Alexandre Courbot , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Johan Hovold , linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de, Markus Pargmann Subject: [PATCH v2] gpio: Allow hogged gpios to be requested Date: Tue, 4 Aug 2015 11:27:04 +0200 Message-Id: <1438680424-698-1-git-send-email-mpa@pengutronix.de> X-Mailer: git-send-email 2.1.4 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: mpa@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-gpio@vger.kernel.org Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org It can be useful to claim hogged gpios later, for example from userspace. This allows to set defaults for GPIOs using the hogging mechanism and override the setup later from userspace or a kernel driver. This patch adds a check for hogged gpios to allow requesting them. If the gpio is not hogged but marked as requested, it still fails with -EBUSY. Signed-off-by: Markus Pargmann --- Only change is, that it is separated from the other series now. drivers/gpio/gpiolib.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 926a1507431f..0f1d1f5faf5d 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -830,7 +830,8 @@ static int __gpiod_request(struct gpio_desc *desc, const char *label) * before IRQs are enabled, for non-sleeping (SOC) GPIOs. */ - if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { + if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0 || + test_and_clear_bit(FLAG_IS_HOGGED, &desc->flags) == 1) { desc_set_label(desc, label ? : "?"); status = 0; } else {