From patchwork Wed Aug 8 13:58:36 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tarun Kanti DebBarma X-Patchwork-Id: 1295981 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id B8F4A3FCFC for ; Wed, 8 Aug 2012 14:02:56 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1Sz6mg-0001vl-E2; Wed, 08 Aug 2012 13:58:50 +0000 Received: from arroyo.ext.ti.com ([192.94.94.40]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1Sz6mc-0001uk-Q8 for linux-arm-kernel@lists.infradead.org; Wed, 08 Aug 2012 13:58:48 +0000 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id q78DwiFu026351; Wed, 8 Aug 2012 08:58:45 -0500 Received: from DBDE71.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id q78Dwi8i015969; Wed, 8 Aug 2012 19:28:44 +0530 (IST) Received: from dbdp32.itg.ti.com (172.24.170.251) by DBDE71.ent.ti.com (172.24.170.149) with Microsoft SMTP Server id 14.1.323.3; Wed, 8 Aug 2012 19:28:43 +0530 Received: from localhost.localdomain (smtpvbd.itg.ti.com [172.24.170.250]) by dbdp32.itg.ti.com (8.13.8/8.13.8) with ESMTP id q78Dwe4D011455; Wed, 8 Aug 2012 19:28:41 +0530 From: Tarun Kanti DebBarma To: Subject: [PATCH v2] gpio/omap: add *remove* callback in platform_driver Date: Wed, 8 Aug 2012 19:28:36 +0530 Message-ID: <1344434316-21141-1-git-send-email-tarun.kanti@ti.com> X-Mailer: git-send-email 1.7.0.4 MIME-Version: 1.0 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -6.9 (------) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-6.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [192.94.94.40 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Kevin Hilman , Paul Walmsley , "Cousson, Benoit" , Rajendra Nayak , linux-kernel@vger.kernel.org, Santosh Shilimkar , Tarun Kanti DebBarma , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add *remove* callback so that necessary cleanup operations are performed when device is unregistered. The device is deleted from the list and associated clock handle is released by calling clk_put() and irq descriptor is released using the irq_free_desc() api. Signed-off-by: Tarun Kanti DebBarma Reported-by: Paul Walmsley Reviewed-by: Jon Hunter Cc: Kevin Hilman Cc: Rajendra Nayak Cc: Santosh Shilimkar Cc: Cousson, Benoit Cc: Paul Walmsley --- v2: Baseline: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git Commit: 0d7614f09c1ebdbaa1599a5aba7593f147bf96ee (Linux 3.6-rc1) (1) Use irq_free_descs() instead of irq_free_desc(). Besides, irq_free_desc() was using wrong parameter, irq_base, instead of bank->irq. (2) irq_free_descs() moved outside spin_lock/unlock_*() in order to avoid exception warnings. (3) pm_runtime_disable() added so that bind can happen successfully Test Detail: Step 1: Unbind gpio.5 device in order to invoke the *remove* callback. #echo "omap_gpio.5" > sys/bus/platform/drivers/omap_gpio/unbind Step 2: Bind gpio.5 device and confirm probe() for the device succeeds. #echo "omap_gpio.5" > sys/bus/platform/drivers/omap_gpio/bind Step 3: Execute read/write GPIO test case. drivers/gpio/gpio-omap.c | 35 +++++++++++++++++++++++++++++++++++ 1 files changed, 35 insertions(+), 0 deletions(-) diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c index e6efd77..50de875 100644 --- a/drivers/gpio/gpio-omap.c +++ b/drivers/gpio/gpio-omap.c @@ -1152,6 +1152,40 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev) return ret; } +/** + * omap_gpio_remove - cleanup a registered gpio device + * @pdev: pointer to current gpio platform device + * + * Called by driver framework whenever a gpio device is unregistered. + * GPIO is deleted from the list and associated clock handle freed. + */ +static int __devexit omap_gpio_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct gpio_bank *bank; + unsigned long flags; + int ret = -EINVAL; + + list_for_each_entry(bank, &omap_gpio_list, node) { + spin_lock_irqsave(&bank->lock, flags); + if (bank->dev == dev) { + clk_put(bank->dbck); + list_del(&bank->node); + ret = 0; + spin_unlock_irqrestore(&bank->lock, flags); + break; + } + spin_unlock_irqrestore(&bank->lock, flags); + } + + if (!ret) { + pm_runtime_disable(bank->dev); + irq_free_descs(bank->irq_base, bank->width); + } + + return ret; +} + #ifdef CONFIG_ARCH_OMAP2PLUS #if defined(CONFIG_PM_RUNTIME) @@ -1478,6 +1512,7 @@ MODULE_DEVICE_TABLE(of, omap_gpio_match); static struct platform_driver omap_gpio_driver = { .probe = omap_gpio_probe, + .remove = __devexit_p(omap_gpio_remove), .driver = { .name = "omap_gpio", .pm = &gpio_pm_ops,