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: 698836 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD220EB64DC for ; Mon, 3 Jul 2023 05:41:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229959AbjGCFlg (ORCPT ); Mon, 3 Jul 2023 01:41:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229764AbjGCFle (ORCPT ); Mon, 3 Jul 2023 01:41:34 -0400 X-Greylist: delayed 583 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Sun, 02 Jul 2023 22:41:29 PDT Received: from codeconstruct.com.au (pi.codeconstruct.com.au [203.29.241.158]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D0DC3BE; Sun, 2 Jul 2023 22:41:29 -0700 (PDT) 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 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.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 */