From patchwork Fri Mar 18 16:00:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= X-Patchwork-Id: 12785553 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 71C42C433FE for ; Fri, 18 Mar 2022 16:03:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238382AbiCRQEi (ORCPT ); Fri, 18 Mar 2022 12:04:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59690 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238374AbiCRQEg (ORCPT ); Fri, 18 Mar 2022 12:04:36 -0400 Received: from relay2-d.mail.gandi.net (relay2-d.mail.gandi.net [217.70.183.194]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F39C1275F; Fri, 18 Mar 2022 09:03:13 -0700 (PDT) Received: (Authenticated sender: clement.leger@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id 0E66F40020; Fri, 18 Mar 2022 16:03:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1647619391; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=K6nzaAfWaNMngOEuYPSa1o6WfkdK08VPd1q8M2c4niI=; b=OSZ5hewzHdXf7aZGTwpgXByUoG8K/3/hBmkg7sfe6OQ8e1KUqsF0Ht5YZQkUzjnwtHpfT8 fWiNZ8u1zK5nOIaWP3eCDVtADmAeSbXRn+nEaS4swQpTvligBkvahEt/Mr7abhxCIRAmPJ eNkYTIhynxXg9yTZshQAGFWSlMCyEWtPI8nezu97mcoLssEi+RK2kx7jY4E9uVGr+pl+WI z6/kboPBEoS76PTiWKA1qLYrx6e9wH93LMEBKOjbZrL8r/f2uhq4p3hKX6nH9I2s1+Q6mY Jzwwf8OSE+OG+TnN/+AoEbaVLZ2xAzTUbL8jKkMbwo+DJKBbRKbaupM35VrLrA== From: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= To: Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , "'Rafael J . Wysocki '" , Wolfram Sang , Peter Rosin , Russell King , Andrew Lunn , Heiner Kallweit , "David S . Miller" , Jakub Kicinski , Paolo Abeni Cc: Hans de Goede , Thomas Petazzoni , Alexandre Belloni , Allan Nielsen , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-i2c@vger.kernel.org, netdev@vger.kernel.org, =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= Subject: [PATCH 1/6] property: add fwnode_property_read_string_index() Date: Fri, 18 Mar 2022 17:00:47 +0100 Message-Id: <20220318160059.328208-2-clement.leger@bootlin.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220318160059.328208-1-clement.leger@bootlin.com> References: <20220318160059.328208-1-clement.leger@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Add fwnode_property_read_string_index() function which allows to retrieve a string from an array by its index. This function is the equivalent of of_property_read_string_index() but for fwnode support. Signed-off-by: Clément Léger --- drivers/base/property.c | 48 ++++++++++++++++++++++++++++++++++++++++ include/linux/property.h | 3 +++ 2 files changed, 51 insertions(+) diff --git a/drivers/base/property.c b/drivers/base/property.c index e6497f6877ee..67c33c11f00c 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -451,6 +451,54 @@ int fwnode_property_match_string(const struct fwnode_handle *fwnode, } EXPORT_SYMBOL_GPL(fwnode_property_match_string); +/** + * fwnode_property_read_string_index - read a string in an array using an index + * @fwnode: Firmware node to get the property of + * @propname: Name of the property holding the array + * @index: Index of the string to look for + * @string: Pointer to the string if found + * + * Find a string by a given index in a string array and if it is found return + * the string value in @string. + * + * Return: %0 if the property was found (success), + * %-EINVAL if given arguments are not valid, + * %-ENODATA if the property does not have a value, + * %-EPROTO if the property is not an array of strings, + * %-ENXIO if no suitable firmware interface is present. + */ +int fwnode_property_read_string_index(const struct fwnode_handle *fwnode, + const char *propname, int index, + const char **string) +{ + const char **values; + int nval, ret; + + nval = fwnode_property_read_string_array(fwnode, propname, NULL, 0); + if (nval < 0) + return nval; + + if (index >= nval) + return -EINVAL; + + if (nval == 0) + return -ENODATA; + + values = kcalloc(nval, sizeof(*values), GFP_KERNEL); + if (!values) + return -ENOMEM; + + ret = fwnode_property_read_string_array(fwnode, propname, values, nval); + if (ret < 0) + goto out; + + *string = values[index]; +out: + kfree(values); + return ret; +} +EXPORT_SYMBOL_GPL(fwnode_property_read_string_index); + /** * fwnode_property_get_reference_args() - Find a reference with arguments * @fwnode: Firmware node where to look for the reference diff --git a/include/linux/property.h b/include/linux/property.h index 7399a0b45f98..a033920eb10a 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -70,6 +70,9 @@ int fwnode_property_read_string_array(const struct fwnode_handle *fwnode, size_t nval); int fwnode_property_read_string(const struct fwnode_handle *fwnode, const char *propname, const char **val); +int fwnode_property_read_string_index(const struct fwnode_handle *fwnode, + const char *propname, int index, + const char **string); int fwnode_property_match_string(const struct fwnode_handle *fwnode, const char *propname, const char *string); int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,