From patchwork Mon Feb 22 14:07:50 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laxman Dewangan X-Patchwork-Id: 8377171 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id AB1DFC0553 for ; Mon, 22 Feb 2016 14:23:39 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id BC8E7204AE for ; Mon, 22 Feb 2016 14:23:38 +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 D52592050E for ; Mon, 22 Feb 2016 14:23:37 +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 1aXrNI-0004fL-7U; Mon, 22 Feb 2016 14:22:08 +0000 Received: from hqemgate16.nvidia.com ([216.228.121.65]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aXrMx-0004SB-9Q for linux-arm-kernel@lists.infradead.org; Mon, 22 Feb 2016 14:21:49 +0000 Received: from hqnvupgp08.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com id ; Mon, 22 Feb 2016 06:21:53 -0800 Received: from hqemhub03.nvidia.com ([172.20.150.15]) by hqnvupgp08.nvidia.com (PGP Universal service); Mon, 22 Feb 2016 06:21:24 -0800 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Mon, 22 Feb 2016 06:21:24 -0800 Received: from ldewanganubuntu-System-Product-Name.nvidia.com (172.20.144.16) by hqemhub03.nvidia.com (172.20.150.15) with Microsoft SMTP Server (TLS) id 8.3.406.0; Mon, 22 Feb 2016 06:21:27 -0800 From: Laxman Dewangan To: , , , , , , , , , Subject: [PATCH 01/61] gpio: Add devm_ apis for gpiochip_add_data and gpiochip_remove Date: Mon, 22 Feb 2016 19:37:50 +0530 Message-ID: <1456150130-2668-2-git-send-email-ldewangan@nvidia.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1456150130-2668-1-git-send-email-ldewangan@nvidia.com> References: <1456150130-2668-1-git-send-email-ldewangan@nvidia.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160222_062147_551294_E6E58EFC X-CRM114-Status: GOOD ( 15.14 ) X-Spam-Score: -6.9 (------) 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: linux-tegra@vger.kernel.org, linux-doc@vger.kernel.org, gregkh@linuxfoundation.org, patches@opensource.wolfsonmicro.com, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, ldewangan@nvidia.com, bcm-kernel-feedback-list@broadcom.com, bjorn.andersson@sonymobile.com, catalin.marinas@arm.com, a.kesavan@samsung.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 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 Add device managed APIs devm_gpiochip_add_data() and devm_gpiochip_remove() for the APIs gpiochip_add_data() and gpiochip_remove(). This helps in reducing code in error path and sometimes removal of .remove callback for driver unbind. Signed-off-by: Laxman Dewangan --- drivers/gpio/gpiolib.c | 74 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/gpio/driver.h | 4 +++ 2 files changed, 78 insertions(+) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 5c1ba87..d9a40bc 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -462,6 +462,80 @@ void gpiochip_remove(struct gpio_chip *chip) } EXPORT_SYMBOL_GPL(gpiochip_remove); +static void devm_gpio_chip_release(struct device *dev, void *res) +{ + struct gpio_chip *chip = *(struct gpio_chip **)res; + + gpiochip_remove(chip); +} + +static int devm_gpio_chip_match(struct device *dev, void *res, void *data) + +{ + struct gpio_chip **r = res; + + if (!r || !*r) { + WARN_ON(!r || !*r); + return 0; + } + + return *r == data; +} + +/** + * devm_gpiochip_add_data() - Resource manager piochip_add_data() + * @dev: the device pointer on which irq_chip belongs to. + * @chip: the chip to register, with chip->base initialized + * Context: potentially before irqs will work + * + * Returns a negative errno if the chip can't be registered, such as + * because the chip->base is invalid or already associated with a + * different chip. Otherwise it returns zero as a success code. + * + * The gpio chip automatically be released when the device is unbound. + */ +int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, + void *data) +{ + struct gpio_chip **ptr; + int ret; + + ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), + GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + ret = gpiochip_add_data(chip, data); + if (ret < 0) { + devres_free(ptr); + return ret; + } + + *ptr = chip; + devres_add(dev, ptr); + + return 0; +} +EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); + +/** + * devm_gpiochip_remove() - Resource manager of gpiochip_remove() + * @dev: device for which which resource was allocated + * @chip: the chip to remove + * + * A gpio_chip with any GPIOs still requested may not be removed. + */ +void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) +{ + int ret; + + ret = devres_release(dev, devm_gpio_chip_release, + devm_gpio_chip_match, chip); + if (!ret) + WARN_ON(ret); +} +EXPORT_SYMBOL_GPL(devm_gpiochip_remove); + /** * gpiochip_find() - iterator for locating a specific gpio_chip * @data: data to pass to match function diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 82fda48..d5d19cc 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -205,6 +205,10 @@ static inline int gpiochip_add(struct gpio_chip *chip) return gpiochip_add_data(chip, NULL); } extern void gpiochip_remove(struct gpio_chip *chip); +extern int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, + void *data); +extern void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip); + extern struct gpio_chip *gpiochip_find(void *data, int (*match)(struct gpio_chip *chip, void *data));