From patchwork Fri Aug 4 07:09:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 710434 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 50BB7C04FE0 for ; Fri, 4 Aug 2023 07:09:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233790AbjHDHJq (ORCPT ); Fri, 4 Aug 2023 03:09:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55394 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234038AbjHDHJo (ORCPT ); Fri, 4 Aug 2023 03:09:44 -0400 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id DC9EC30DB; Fri, 4 Aug 2023 00:09:41 -0700 (PDT) X-IronPort-AV: E=Sophos;i="6.01,254,1684767600"; d="scan'208";a="171902704" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 04 Aug 2023 16:09:41 +0900 Received: from localhost.localdomain (unknown [10.226.93.35]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id D5CC3419E609; Fri, 4 Aug 2023 16:09:37 +0900 (JST) From: Biju Das To: Wolfram Sang Cc: Biju Das , linux-i2c@vger.kernel.org, Geert Uytterhoeven , Dmitry Torokhov , Andy Shevchenko , Andi Shyti , Alexandre Belloni , Jonathan Cameron , linux-rtc@vger.kernel.org, linux-iio@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v6 4/4] i2c: Add i2c_device_get_match_data() callback Date: Fri, 4 Aug 2023 08:09:15 +0100 Message-Id: <20230804070915.117829-5-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230804070915.117829-1-biju.das.jz@bp.renesas.com> References: <20230804070915.117829-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Add i2c_device_get_match_data() callback to struct bus_type(). While at it, introduced i2c_get_match_data_helper() to avoid code duplication with i2c_get_match_data(). Suggested-by: Dmitry Torokhov Suggested-by: Andy Shevchenko Signed-off-by: Biju Das --- v5->v6: * Merged with patch#3 from v5. * Separate patch#3 to prepare for better difference for i2c_match_id() changes. v4->v5: * Added const struct device_driver variable 'drv' in i2c_device_get_match _data(). * For code readability and maintenance perspective, added separate NULL check for drv and client variable and added comment for NULL check for drv variable. v3->v4: * Dropped struct i2c_driver parameter from i2c_get_match_data_helper() * Split I2C sysfs handling in separate patch. v2->v3: * Extended to support i2c_of_match_device() as suggested by Andy. * Changed i2c_of_match_device_sysfs() as non-static function as it is needed for i2c_device_get_match_data(). * Added a TODO comment to use i2c_verify_client() when it accepts const pointer. * Added multiple returns to make code path for device_get_match_data() faster in i2c_get_match_data(). RFC v1->v2: * Replaced "Signed-off-by"->"Suggested-by" tag for Dmitry. * Fixed build warnings reported by kernel test robot * Added const qualifier to return type and parameter struct i2c_driver in i2c_get_match_data_helper(). * Added const qualifier to struct i2c_driver in i2c_get_match_data() * Dropped driver variable from i2c_device_get_match_data() * Replaced to_i2c_client with logic for assigning verify_client as it returns non const pointer. --- drivers/i2c/i2c-core-base.c | 53 ++++++++++++++++++++++++++++++++----- 1 file changed, 47 insertions(+), 6 deletions(-) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 7005dfe64066..d543460e47c2 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -114,15 +114,10 @@ const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id, } EXPORT_SYMBOL_GPL(i2c_match_id); -const void *i2c_get_match_data(const struct i2c_client *client) +static const void *i2c_get_match_data_helper(const struct i2c_client *client) { const struct i2c_driver *driver = to_i2c_driver(client->dev.driver); const struct i2c_device_id *match; - const void *data; - - data = device_get_match_data(&client->dev); - if (data) - return data; match = i2c_match_id(driver->id_table, client); if (!match) @@ -130,6 +125,51 @@ const void *i2c_get_match_data(const struct i2c_client *client) return (const void *)match->driver_data; } + +static const void *i2c_device_get_match_data(const struct device *dev) +{ + const struct device_driver *drv = dev->driver; + const struct i2c_client *client; + const void *data; + + /* + * It is not guaranteed that the function is always called on a device + * bound to a driver (even though we normally expect this to be the + * case). + */ + if (!drv) + return NULL; + + /* TODO: use i2c_verify_client() when it accepts const pointer */ + client = (dev->type == &i2c_client_type) ? to_i2c_client(dev) : NULL; + if (!client) + return NULL; + + data = i2c_get_match_data_helper(client); + if (data) + return data; + + if (drv->of_match_table) { + const struct of_device_id *match; + + match = i2c_of_match_device_sysfs(drv->of_match_table, client); + if (match) + return match->data; + } + + return NULL; +} + +const void *i2c_get_match_data(const struct i2c_client *client) +{ + const void *data; + + data = device_get_match_data(&client->dev); + if (data) + return data; + + return i2c_get_match_data_helper(client); +} EXPORT_SYMBOL(i2c_get_match_data); static int i2c_device_match(struct device *dev, struct device_driver *drv) @@ -694,6 +734,7 @@ struct bus_type i2c_bus_type = { .probe = i2c_device_probe, .remove = i2c_device_remove, .shutdown = i2c_device_shutdown, + .get_match_data = i2c_device_get_match_data, }; EXPORT_SYMBOL_GPL(i2c_bus_type);