From patchwork Wed May 29 07:48:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yoshihiro Shimoda X-Patchwork-Id: 10966385 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DB3AB13AD for ; Wed, 29 May 2019 07:52:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D00A7285B6 for ; Wed, 29 May 2019 07:52:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C48002882A; Wed, 29 May 2019 07:52:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5B0C728826 for ; Wed, 29 May 2019 07:52:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726408AbfE2Hw4 (ORCPT ); Wed, 29 May 2019 03:52:56 -0400 Received: from relmlor2.renesas.com ([210.160.252.172]:7651 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725895AbfE2Hw4 (ORCPT ); Wed, 29 May 2019 03:52:56 -0400 X-IronPort-AV: E=Sophos;i="5.60,526,1549897200"; d="scan'208";a="17060850" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 29 May 2019 16:52:52 +0900 Received: from localhost.localdomain (unknown [10.166.17.210]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 9BD334001DCA; Wed, 29 May 2019 16:52:52 +0900 (JST) From: Yoshihiro Shimoda To: thierry.reding@gmail.com Cc: linux-pwm@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Yoshihiro Shimoda Subject: [PATCH 3/4] pwm: sysfs: Add suspend/resume support Date: Wed, 29 May 2019 16:48:01 +0900 Message-Id: <1559116082-9851-4-git-send-email-yoshihiro.shimoda.uh@renesas.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1559116082-9851-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> References: <1559116082-9851-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP According to the Documentation/pwm.txt, all PWM consumers should have power management. Since this sysfs interface is one of consumers so that this patch adds suspend/resume support. Signed-off-by: Yoshihiro Shimoda --- drivers/pwm/sysfs.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c index 7eb4a13..72dafdd 100644 --- a/drivers/pwm/sysfs.c +++ b/drivers/pwm/sysfs.c @@ -18,6 +18,7 @@ struct pwm_export { struct device child; struct pwm_device *pwm; struct mutex lock; + bool enabled_in_suspend; }; static struct pwm_export *child_to_pwm_export(struct device *child) @@ -372,10 +373,73 @@ static struct attribute *pwm_chip_attrs[] = { }; ATTRIBUTE_GROUPS(pwm_chip); +static int pwm_class_suspend_resume(struct device *parent, bool suspend) +{ + struct pwm_chip *chip = dev_get_drvdata(parent); + unsigned int i; + int ret = 0; + + for (i = 0; i < chip->npwm; i++) { + struct pwm_device *pwm = &chip->pwms[i]; + struct device *child; + struct pwm_export *export; + struct pwm_state state; + + if (!test_bit(PWMF_EXPORTED, &pwm->flags)) + continue; + + child = device_find_child(parent, pwm, pwm_unexport_match); + if (!child) + goto rollback; + + export = child_to_pwm_export(child); + put_device(child); /* for device_find_child() */ + if (!export) + goto rollback; + + mutex_lock(&export->lock); + pwm_get_state(pwm, &state); + if (suspend) { + if (state.enabled) + export->enabled_in_suspend = true; + state.enabled = false; + } else if (export->enabled_in_suspend) { + state.enabled = true; + export->enabled_in_suspend = false; + } + ret = pwm_apply_state(pwm, &state); + mutex_unlock(&export->lock); + if (ret < 0) + goto rollback; + } + + return ret; + +rollback: + /* roll back only when suspend */ + if (suspend) + pwm_class_suspend_resume(parent, false); + + return ret; +} + +static int pwm_class_suspend(struct device *parent) +{ + return pwm_class_suspend_resume(parent, true); +} + +static int pwm_class_resume(struct device *parent) +{ + return pwm_class_suspend_resume(parent, false); +} + +static SIMPLE_DEV_PM_OPS(pwm_class_pm_ops, pwm_class_suspend, pwm_class_resume); + static struct class pwm_class = { .name = "pwm", .owner = THIS_MODULE, .dev_groups = pwm_chip_groups, + .pm = &pwm_class_pm_ops, }; static int pwmchip_sysfs_match(struct device *parent, const void *data)