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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 BAB3DC47082 for ; Mon, 7 Jun 2021 08:27:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A3A0A6121F for ; Mon, 7 Jun 2021 08:27:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230287AbhFGI3X (ORCPT ); Mon, 7 Jun 2021 04:29:23 -0400 Received: from router.aksignal.cz ([62.44.4.214]:56224 "EHLO router.aksignal.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230252AbhFGI3D (ORCPT ); Mon, 7 Jun 2021 04:29:03 -0400 Received: from localhost (localhost [127.0.0.1]) by router.aksignal.cz (Postfix) with ESMTP id B4D0A418EE; Mon, 7 Jun 2021 10:27:10 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at router.aksignal.cz Received: from router.aksignal.cz ([127.0.0.1]) by localhost (router.aksignal.cz [127.0.0.1]) (amavisd-new, port 10026) with LMTP id kUcqlnEQObIz; Mon, 7 Jun 2021 10:27:04 +0200 (CEST) Received: from pc-gameroom.prchals.tk (unknown [83.240.30.185]) (Authenticated sender: jiri.prchal@aksignal.cz) by router.aksignal.cz (Postfix) with ESMTPSA id BBBCD41A11; Mon, 7 Jun 2021 10:26:59 +0200 (CEST) From: Jiri Prchal To: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Rob Herring , Christian Eggers , Arnd Bergmann , Greg Kroah-Hartman , Jiri Prchal Subject: [PATCH v6 4/5] nvmem: eeprom: at25: export FRAM serial num Date: Mon, 7 Jun 2021 10:26:37 +0200 Message-Id: <20210607082638.52409-5-jiri.prchal@aksignal.cz> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210607082638.52409-1-jiri.prchal@aksignal.cz> References: <20210607082638.52409-1-jiri.prchal@aksignal.cz> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This exports serial number of FRAM in sysfs file named "sernum". Formatted in hex, each byte separated by space. Example: $ cat /sys/class/spi_master/spi0/spi0.0/sernum 0000a43644f2ae6c Signed-off-by: Jiri Prchal --- v2: no change here v3: resend and added more recipients v4: resend v5: reworked up on Greg comments: no spaces in string, sysfs done correctly v6: no change here --- drivers/misc/eeprom/at25.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c index 45a486994828..4e4fa8d3ba5d 100644 --- a/drivers/misc/eeprom/at25.c +++ b/drivers/misc/eeprom/at25.c @@ -39,6 +39,7 @@ struct at25_data { struct nvmem_config nvmem_config; struct nvmem_device *nvmem; int has_sernum; + char *sernum; }; #define AT25_WREN 0x06 /* latch the write enable */ @@ -173,6 +174,25 @@ static int fm25_aux_read(struct at25_data *at25, char *buf, uint8_t command, return status; } +static ssize_t sernum_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct at25_data *at25; + int i; + + at25 = dev_get_drvdata(dev); + for (i = FM25_SN_LEN - 1; i >= 0; i--) + buf += sprintf(buf, "%02x", at25->sernum[i]); + sprintf(buf, "\n"); + return (2 * FM25_SN_LEN + 1); +} +static DEVICE_ATTR(sernum, 0440, sernum_show, NULL); + +static struct attribute *sernum_attrs[] = { + &dev_attr_sernum.attr, + NULL, +}; +ATTRIBUTE_GROUPS(sernum); + static int at25_ee_write(void *priv, unsigned int off, void *val, size_t count) { struct at25_data *at25 = priv; @@ -417,8 +437,13 @@ static int at25_probe(struct spi_device *spi) else at25->chip.flags |= EE_ADDR2; - if (id[8]) + if (id[8]) { at25->has_sernum = 1; + at25->sernum = kzalloc(FM25_SN_LEN, GFP_KERNEL); + if (!at25->sernum) + return -ENOMEM; + fm25_aux_read(at25, at25->sernum, FM25_RDSN, FM25_SN_LEN); + } else at25->has_sernum = 0; @@ -472,6 +497,7 @@ static struct spi_driver at25_driver = { .driver = { .name = "at25", .of_match_table = at25_of_match, + .dev_groups = sernum_groups, }, .probe = at25_probe, }; -- 2.25.1