From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIMWL_WL_MED, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 32DDCFC6182 for ; Fri, 14 Sep 2018 14:40:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D2E2A214C4 for ; Fri, 14 Sep 2018 14:40:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bgdev-pl.20150623.gappssmtp.com header.i=@bgdev-pl.20150623.gappssmtp.com header.b="rFtkcoou" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D2E2A214C4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bgdev.pl Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728495AbeINTzh (ORCPT ); Fri, 14 Sep 2018 15:55:37 -0400 Received: from mail-wr1-f68.google.com ([209.85.221.68]:45318 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728469AbeINTzf (ORCPT ); Fri, 14 Sep 2018 15:55:35 -0400 Received: by mail-wr1-f68.google.com with SMTP id 20-v6so10831937wrb.12 for ; Fri, 14 Sep 2018 07:40:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=xUWytVeU60Ge4e6flnnEzHifvO92bv3CXt84Mfa/t9w=; b=rFtkcoouPEiGykuZjqSBcnRdSc5Uj1i1Hvm/jxhYa7EiTDErrMnV0bknzVe08c/u9x PfdAQK3cpWPqmaAQhKUOsYx9t0CrL8KfngEwNp5WqrgsBtZtSIE5B/RjSDFXsYbqRCfS /CUsA/YWCw41r6o6qPctTthDJih0yrI9jh++kLn3+tcdbDo9wpbEfIVHFl2E9tHUD/op xDhTEFC6dNxebzXHXwBMYsZbGiV4lXGzXLFcLU9wcxu3KxE6p+b2ryDDvIOfxc8Insv9 aPczgP6kfgN9Eo0xr1/ayCqEedDpzyI8eytgVEgXP1Z9Mu+pxa3m75AUGRxXftD/uOiF A2qg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=xUWytVeU60Ge4e6flnnEzHifvO92bv3CXt84Mfa/t9w=; b=Jtzx/jGKcsHrZwJWKdsHeGkZm2x6OVedo5vU7KKpQ+rJ98OCM0jXAbNcofByVRAvA3 NxmOqmtw7YVvYeOYD1DPhBpwvWvXmy0xYYuzoW38qI2a7bOGJBGg1cd5UAo7oVxfNziq Z8iSO7cONCNnps+PO0wSs0/xGh74IOCyXCyBicVIJvAwhVfVweMw+GYedRBhRJilJRz7 conIZRHdhlM82heFpjqNRQprADCggY7nzaf32mgw6ldbpqAh3i2w1/f+M5iOlR7fv+Qu lneX/AtaJCvf+vHJwZniWBcXbeqRXVjOZWvotSN2rV1iv2vEmEtxp1eyIcf+LALPZBHD FEeQ== X-Gm-Message-State: APzg51Bck9PWaHAuqnhhZBnIzwKsfWNp87uObbH2sOf+1f+GJE0lbb2B 61DgeICzG5Vq7g6cji+uFiadpA== X-Google-Smtp-Source: ANB0VdahqfCi6dDykvBf1NSmUEfDvA15ATslS+f8n5FCEYmJcFfHCyZ8tVeVxH6rDZqwPib36gq45w== X-Received: by 2002:adf:eaca:: with SMTP id o10-v6mr9244818wrn.98.1536936046386; Fri, 14 Sep 2018 07:40:46 -0700 (PDT) Received: from brgl-bgdev.home ([2a01:cb1d:af:5b00:e837:b8d5:48c1:571b]) by smtp.gmail.com with ESMTPSA id v46-v6sm10313526wrc.63.2018.09.14.07.40.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 14 Sep 2018 07:40:45 -0700 (PDT) From: Bartosz Golaszewski To: Srinivas Kandagatla , "David S . Miller" , Mauro Carvalho Chehab , Greg Kroah-Hartman , Andrew Morton , Arnd Bergmann , Jonathan Corbet , Sekhar Nori , Kevin Hilman , David Lechner , Boris Brezillon , Andrew Lunn , Alban Bedel , Maxime Ripard , Chen-Yu Tsai Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Bartosz Golaszewski Subject: [PATCH v4 17/22] nvmem: add a notifier chain Date: Fri, 14 Sep 2018 16:40:06 +0200 Message-Id: <20180914144011.27614-18-brgl@bgdev.pl> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180914144011.27614-1-brgl@bgdev.pl> References: <20180914144011.27614-1-brgl@bgdev.pl> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bartosz Golaszewski Add a blocking notifier chain with four events (add and remove for both devices and cells) so that users can get notified about the addition of nvmem resources they're waiting for. We'll use this instead of the at24 setup callback in the mityomapl138 board file. Signed-off-by: Bartosz Golaszewski --- drivers/nvmem/core.c | 36 ++++++++++++++++++++++++++++++++++ include/linux/nvmem-consumer.h | 21 ++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 9cc86d131e1e..da441019b609 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -65,6 +65,8 @@ static LIST_HEAD(nvmem_cell_tables); static DEFINE_MUTEX(nvmem_lookup_mutex); static LIST_HEAD(nvmem_lookup_list); +static BLOCKING_NOTIFIER_HEAD(nvmem_notifier); + #ifdef CONFIG_DEBUG_LOCK_ALLOC static struct lock_class_key eeprom_lock_key; #endif @@ -300,6 +302,7 @@ static struct nvmem_device *nvmem_find(const char *name) static void nvmem_cell_drop(struct nvmem_cell *cell) { + blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_REMOVE, cell); mutex_lock(&nvmem_mutex); list_del(&cell->node); mutex_unlock(&nvmem_mutex); @@ -319,6 +322,7 @@ static void nvmem_cell_add(struct nvmem_cell *cell) mutex_lock(&nvmem_mutex); list_add_tail(&cell->node, &cell->nvmem->cells); mutex_unlock(&nvmem_mutex); + blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_ADD, cell); } static int nvmem_cell_info_to_nvmem_cell(struct nvmem_device *nvmem, @@ -434,6 +438,32 @@ static int nvmem_setup_compat(struct nvmem_device *nvmem, return 0; } +/** + * nvmem_register_notifier() - Register a notifier block for nvmem events. + * + * @nb: notifier block to be called on nvmem events. + * + * Return: 0 on success, negative error number on failure. + */ +int nvmem_register_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&nvmem_notifier, nb); +} +EXPORT_SYMBOL_GPL(nvmem_register_notifier); + +/** + * nvmem_unregister_notifier() - Unregister a notifier block for nvmem events. + * + * @nb: notifier block to be unregistered. + * + * Return: 0 on success, negative error number on failure. + */ +int nvmem_unregister_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&nvmem_notifier, nb); +} +EXPORT_SYMBOL_GPL(nvmem_unregister_notifier); + static int nvmem_add_cells_from_table(struct nvmem_device *nvmem) { const struct nvmem_cell_info *info; @@ -647,6 +677,10 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) if (rval) goto err_remove_cells; + rval = blocking_notifier_call_chain(&nvmem_notifier, NVMEM_ADD, nvmem); + if (rval) + goto err_remove_cells; + return nvmem; err_remove_cells: @@ -669,6 +703,8 @@ static void nvmem_device_release(struct kref *kref) nvmem = container_of(kref, struct nvmem_device, refcnt); + blocking_notifier_call_chain(&nvmem_notifier, NVMEM_REMOVE, nvmem); + if (nvmem->flags & FLAG_COMPAT) device_remove_bin_file(nvmem->base_dev, &nvmem->eeprom); diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h index 27eee3945405..0326b52e906b 100644 --- a/include/linux/nvmem-consumer.h +++ b/include/linux/nvmem-consumer.h @@ -14,6 +14,7 @@ #include #include +#include struct device; struct device_node; @@ -47,6 +48,13 @@ struct nvmem_cell_lookup { struct list_head node; }; +enum { + NVMEM_ADD = 1, + NVMEM_REMOVE, + NVMEM_CELL_ADD, + NVMEM_CELL_REMOVE, +}; + #if IS_ENABLED(CONFIG_NVMEM) /* Cell based interface */ @@ -80,6 +88,9 @@ void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries, void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries); +int nvmem_register_notifier(struct notifier_block *nb); +int nvmem_unregister_notifier(struct notifier_block *nb); + #else static inline struct nvmem_cell *nvmem_cell_get(struct device *dev, @@ -179,6 +190,16 @@ nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) {} static inline void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) {} +static inline int nvmem_register_notifier(struct notifier_block *nb) +{ + return -ENOSYS; +} + +static inline int nvmem_unregister_notifier(struct notifier_block *nb) +{ + return -ENOSYS; +} + #endif /* CONFIG_NVMEM */ #if IS_ENABLED(CONFIG_NVMEM) && IS_ENABLED(CONFIG_OF) -- 2.18.0