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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 7988AC48BDB for ; Sun, 7 Jul 2019 19:47:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5918720663 for ; Sun, 7 Jul 2019 19:47:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728758AbfGGTrA (ORCPT ); Sun, 7 Jul 2019 15:47:00 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:56848 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727457AbfGGTiB (ORCPT ); Sun, 7 Jul 2019 15:38:01 -0400 Received: from 94.197.121.43.threembb.co.uk ([94.197.121.43] helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hkCz1-0006dM-AU; Sun, 07 Jul 2019 20:37:59 +0100 Received: from ben by deadeye with local (Exim 4.92) (envelope-from ) id 1hkCz0-0005XU-94; Sun, 07 Jul 2019 20:37:58 +0100 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, Denis Kirjanov , "Jeremy Fertic" , "Jonathan Cameron" Date: Sun, 07 Jul 2019 17:54:17 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 015/129] staging: iio: adt7316: fix handling of dac high resolution option In-Reply-To: X-SA-Exim-Connect-IP: 94.197.121.43 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.70-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Jeremy Fertic commit 76b7fe8d6c4daf4db672eb953c892c6f6572a282 upstream. The adt7316/7 and adt7516/7 have the option to output voltage proportional to temperature on dac a and/or dac b. The default dac resolution in this mode is 8 bits with the dac high resolution option enabling 10 bits. None of these settings affect dacs c and d. Remove the "1 (12 bits)" output from the show function since that is not an option for this mode. Return "1 (10 bits)" if the device is one of the above mentioned chips and the dac high resolution mode is enabled. In the store function, the driver currently allows the user to write to the ADT7316_DA_HIGH_RESOLUTION bit regardless of the device in use. Add a check to return an error in the case of an adt7318 or adt7519. Remove the else statement that clears the ADT7316_DA_HIGH_RESOLUTION bit. Instead, clear it before conditionally enabling it, depending on user input. This matches the typical pattern in the driver when an attribute is a boolean. Fixes: 35f6b6b86ede ("staging: iio: new ADT7316/7/8 and ADT7516/7/9 driver") Signed-off-by: Jeremy Fertic Signed-off-by: Jonathan Cameron [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings --- drivers/staging/iio/addac/adt7316.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- a/drivers/staging/iio/addac/adt7316.c +++ b/drivers/staging/iio/addac/adt7316.c @@ -635,9 +635,7 @@ static ssize_t adt7316_show_da_high_reso struct adt7316_chip_info *chip = iio_priv(dev_info); if (chip->config3 & ADT7316_DA_HIGH_RESOLUTION) { - if (chip->id == ID_ADT7316 || chip->id == ID_ADT7516) - return sprintf(buf, "1 (12 bits)\n"); - else if (chip->id == ID_ADT7317 || chip->id == ID_ADT7517) + if (chip->id != ID_ADT7318 && chip->id != ID_ADT7519) return sprintf(buf, "1 (10 bits)\n"); } @@ -654,10 +652,12 @@ static ssize_t adt7316_store_da_high_res u8 config3; int ret; + if (chip->id == ID_ADT7318 || chip->id == ID_ADT7519) + return -EPERM; + + config3 = chip->config3 & (~ADT7316_DA_HIGH_RESOLUTION); if (buf[0] == '1') - config3 = chip->config3 | ADT7316_DA_HIGH_RESOLUTION; - else - config3 = chip->config3 & (~ADT7316_DA_HIGH_RESOLUTION); + config3 |= ADT7316_DA_HIGH_RESOLUTION; ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, config3); if (ret)