From patchwork Mon Jul 3 05:30:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matt Johnston X-Patchwork-Id: 13299587 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B9BB2C0015E for ; Mon, 3 Jul 2023 05:31:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=zTz+PxMOaGwmvm++5vNZXA5ndauyHKOg/baVjpyZnbw=; b=Z5Jt6JOwsk3xAm 39Yk7x64mFNqVSUTGVGY18IdSv4gO8nDTK5fFhKuQA2Omyv+62L0N9rZHYwz1Km7d3OlXXNgRbm7m VPP7RPI8/YCL4NhykCg1pPcahGWu2hEJmMH7LXJ+wWce/gRze+w8TLlGYFujz9iH0eM1RlSurFGeY GEe8NBO2QT+f53sVFe7AEpanD3I0ElBQ540/SpfC/zcVjCmx+sTnYt4Jix0VVN5gKEqV1ksp/digG Ne+AU4uUd9YUSLbwVuuWR1NKUaCHS+udtJu7j1xOwNPtjXpgwdrAIsIZ6l/2wXRqbS479U/0db1VM HXyBZoBEMgldQxeK8hPQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qGCAJ-009LQA-0r; Mon, 03 Jul 2023 05:31:59 +0000 Received: from pi.codeconstruct.com.au ([203.29.241.158] helo=codeconstruct.com.au) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qGCAE-009LMp-08 for linux-i3c@lists.infradead.org; Mon, 03 Jul 2023 05:31:56 +0000 Received: by codeconstruct.com.au (Postfix, from userid 10001) id 6353B202DE; Mon, 3 Jul 2023 13:31:45 +0800 (AWST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=codeconstruct.com.au; s=2022a; t=1688362305; bh=etirfgka1slG3HvdsitkedAudEt33V15LAbET0+71uM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=WzDP5fd/uJS6x2LEy1QvrFH7pVmfGOx6TTiU2UB//tke39WfA57dx/K7I6SvVGmz2 lv2lE8IfCBxuTYFcPcZiBArU3ooQNy1M8VhxEFg/Noe6T7+NcW8GxHLLF7aWNJB51W Ub+6e6a/1jB6VPR1owiyHc2nFDdm5nxfYJVPTcrldHqY4B7x5IcfI/abTYFU9EnOKL UeDNv16d/ozc9n5at3Dn1z7af0zdaK2CtZAzmWLsZZycEorhKMA+UlVqwRhIA+hwzL 8YTqcfeSDyaoDzUhUKjs17fz0/5GuB39nVAF2ffr+KvNOPqRi/xqH0Q2KyeKq+nuuL 7ulqEJC7WrgfQ== From: Matt Johnston To: linux-i3c@lists.infradead.org, netdev@vger.kernel.org, devicetree@vger.kernel.org Cc: Eric Dumazet , Jeremy Kerr , "David S. Miller" , Jakub Kicinski , Paolo Abeni , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Conor Dooley Subject: [PATCH 2/3] i3c: Add support for bus enumeration & notification Date: Mon, 3 Jul 2023 13:30:47 +0800 Message-Id: <20230703053048.275709-3-matt@codeconstruct.com.au> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230703053048.275709-1-matt@codeconstruct.com.au> References: <20230703053048.275709-1-matt@codeconstruct.com.au> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230702_223154_270287_06CC7C36 X-CRM114-Status: GOOD ( 11.43 ) X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org From: Jeremy Kerr This allows other drivers to be notified when new i3c busses are attached, referring to a whole i3c bus as opposed to individual devices. Signed-off-by: Jeremy Kerr --- drivers/i3c/master.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/i3c/master.h | 11 +++++++++++ 2 files changed, 46 insertions(+) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 08aeb69a7800..2276abe38bdc 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -22,6 +22,7 @@ static DEFINE_IDR(i3c_bus_idr); static DEFINE_MUTEX(i3c_core_lock); static int __i3c_first_dynamic_bus_num; +static BLOCKING_NOTIFIER_HEAD(i3c_bus_notifier); /** * i3c_bus_maintenance_lock - Lock the bus for a maintenance operation @@ -453,6 +454,36 @@ static int i3c_bus_init(struct i3c_bus *i3cbus, struct device_node *np) return 0; } +void i3c_for_each_bus_locked(int (*fn)(struct i3c_bus *bus, void *data), + void *data) +{ + struct i3c_bus *bus; + int id; + + mutex_lock(&i3c_core_lock); + idr_for_each_entry(&i3c_bus_idr, bus, id) + fn(bus, data); + mutex_unlock(&i3c_core_lock); +} +EXPORT_SYMBOL_GPL(i3c_for_each_bus_locked); + +int i3c_register_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&i3c_bus_notifier, nb); +} +EXPORT_SYMBOL_GPL(i3c_register_notifier); + +int i3c_unregister_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&i3c_bus_notifier, nb); +} +EXPORT_SYMBOL_GPL(i3c_unregister_notifier); + +static void i3c_bus_notify(struct i3c_bus *bus, unsigned int action) +{ + blocking_notifier_call_chain(&i3c_bus_notifier, action, bus); +} + static const char * const i3c_bus_mode_strings[] = { [I3C_BUS_MODE_PURE] = "pure", [I3C_BUS_MODE_MIXED_FAST] = "mixed-fast", @@ -2678,6 +2709,8 @@ int i3c_master_register(struct i3c_master_controller *master, if (ret) goto err_del_dev; + i3c_bus_notify(i3cbus, I3C_NOTIFY_BUS_ADD); + /* * We're done initializing the bus and the controller, we can now * register I3C devices discovered during the initial DAA. @@ -2710,6 +2743,8 @@ EXPORT_SYMBOL_GPL(i3c_master_register); */ void i3c_master_unregister(struct i3c_master_controller *master) { + i3c_bus_notify(&master->bus, I3C_NOTIFY_BUS_REMOVE); + i3c_master_i2c_adapter_cleanup(master); i3c_master_unregister_i3c_devs(master); i3c_master_bus_cleanup(master); diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h index 0b52da4f2346..db909ef79be4 100644 --- a/include/linux/i3c/master.h +++ b/include/linux/i3c/master.h @@ -24,6 +24,12 @@ struct i2c_client; +/* notifier actions. notifier call data is the struct i3c_bus */ +enum { + I3C_NOTIFY_BUS_ADD, + I3C_NOTIFY_BUS_REMOVE, +}; + struct i3c_master_controller; struct i3c_bus; struct i3c_device; @@ -652,4 +658,9 @@ void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot); struct i3c_ibi_slot *i3c_master_get_free_ibi_slot(struct i3c_dev_desc *dev); +void i3c_for_each_bus_locked(int (*fn)(struct i3c_bus *bus, void *data), + void *data); +int i3c_register_notifier(struct notifier_block *nb); +int i3c_unregister_notifier(struct notifier_block *nb); + #endif /* I3C_MASTER_H */