From mboxrd@z Thu Jan 1 00:00:00 1970 From: 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> Return-path: 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 Sender: linux-gpio-owner@vger.kernel.org List-Id: linux-gpio@vger.kernel.org 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 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 { -- 2.1.4