From patchwork Fri Aug 14 14:11:00 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Pargmann X-Patchwork-Id: 7015361 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id CDF079F344 for ; Fri, 14 Aug 2015 14:14:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 008D9207D2 for ; Fri, 14 Aug 2015 14:14:40 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 380E5207F3 for ; Fri, 14 Aug 2015 14:14:38 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZQFjC-0004W0-Hc; Fri, 14 Aug 2015 14:13:02 +0000 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZQFiW-0003sG-L9 for linux-arm-kernel@lists.infradead.org; Fri, 14 Aug 2015 14:12:21 +0000 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 1ZQFhn-0005mL-RK; Fri, 14 Aug 2015 16:11:35 +0200 Received: from mpa by dude.hi.pengutronix.de with local (Exim 4.86) (envelope-from ) id 1ZQFhl-0000dO-Uh; Fri, 14 Aug 2015 16:11:33 +0200 From: Markus Pargmann To: Linus Walleij Subject: [PATCH v3 3/9] gpiolib: Use GPIO name from names array for gpio descriptor Date: Fri, 14 Aug 2015 16:11:00 +0200 Message-Id: <1439561466-14350-4-git-send-email-mpa@pengutronix.de> X-Mailer: git-send-email 2.4.6 In-Reply-To: <1439561466-14350-1-git-send-email-mpa@pengutronix.de> References: <1439561466-14350-1-git-send-email-mpa@pengutronix.de> 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-arm-kernel@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150814_071220_946882_3884811D X-CRM114-Status: GOOD ( 13.87 ) X-Spam-Score: -2.9 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexandre Courbot , Arun Bharadwaj , Johan Hovold , linux-gpio@vger.kernel.org, kernel@pengutronix.de, =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Markus Pargmann , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds GPIO names to the GPIO descriptors when initializing the gpiochip. It also introduces a check whether any of the new names will conflict with an existing GPIO name. Signed-off-by: Markus Pargmann --- drivers/gpio/gpiolib.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index eed3751fe14f..3908503bebfe 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -250,6 +250,38 @@ static int gpiochip_add_to_list(struct gpio_chip *chip) return err; } +/* + * Takes the names from gc->names and checks if they are all unique. If they + * are, they are assigned to their gpio descriptors. + * + * Returns -EEXIST if one of the names is already used for a different GPIO. + */ +static int gpiochip_set_desc_names(struct gpio_chip *gc) +{ + int i; + + if (!gc->names) + return 0; + + /* First check all names if they are unique */ + for (i = 0; i != gc->ngpio; ++i) { + struct gpio_desc *gpio; + + gpio = gpio_name_to_desc(gc->names[i]); + if (gpio) { + dev_err(gc->dev, "Detected name collision for GPIO name '%s'\n", + gc->names[i]); + return -EEXIST; + } + } + + /* Then add all names to the GPIO descriptors */ + for (i = 0; i != gc->ngpio; ++i) + gc->desc[i].name = gc->names[i]; + + return 0; +} + /** * gpiochip_add() - register a gpio_chip * @chip: the chip to register, with chip->base initialized @@ -319,6 +351,10 @@ int gpiochip_add(struct gpio_chip *chip) INIT_LIST_HEAD(&chip->pin_ranges); #endif + status = gpiochip_set_desc_names(chip); + if (status) + goto err_remove_from_list; + of_gpiochip_add(chip); acpi_gpiochip_add(chip); @@ -336,6 +372,7 @@ err_remove_chip: acpi_gpiochip_remove(chip); gpiochip_free_hogs(chip); of_gpiochip_remove(chip); +err_remove_from_list: spin_lock_irqsave(&gpio_lock, flags); list_del(&chip->list); spin_unlock_irqrestore(&gpio_lock, flags);