From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756506AbbIUJiP (ORCPT ); Mon, 21 Sep 2015 05:38:15 -0400 Received: from down.free-electrons.com ([37.187.137.238]:54214 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756124AbbIUJeH (ORCPT ); Mon, 21 Sep 2015 05:34:07 -0400 From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org, Mark Brown , Liam Girdwood , Jingoo Han , Lee Jones , linux-fbdev@vger.kernel.org, Bryan Wu , Richard Purdie , Jacek Anaszewski , linux-leds@vger.kernel.org, Maxime Ripard , linux-sunxi@googlegroups.com, Heiko Stuebner , linux-rockchip@lists.infradead.org, Jean-Christophe Plagniol-Villard , Tomi Valkeinen , Daniel Mack , Haojian Zhuang , Robert Jarzmik Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Doug Anderson , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Boris Brezillon Subject: [PATCH v3 03/12] pwm: move the enabled/disabled info to pwm_state struct Date: Mon, 21 Sep 2015 11:33:20 +0200 Message-Id: <1442828009-6241-4-git-send-email-boris.brezillon@free-electrons.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1442828009-6241-1-git-send-email-boris.brezillon@free-electrons.com> References: <1442828009-6241-1-git-send-email-boris.brezillon@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Prepare the transition to PWM atomic update by moving the enabled/disabled state into the pwm_state struct. This way we can easily update the whole PWM state by copying the new state in the ->state field. Signed-off-by: Boris Brezillon --- drivers/pwm/core.c | 15 ++++++++++++--- include/linux/pwm.h | 7 ++++--- 2 files changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 09037de..963238c3 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -494,8 +494,15 @@ EXPORT_SYMBOL_GPL(pwm_set_polarity); */ int pwm_enable(struct pwm_device *pwm) { - if (pwm && !test_and_set_bit(PWMF_ENABLED, &pwm->flags)) - return pwm->chip->ops->enable(pwm->chip, pwm); + if (pwm && !pwm_is_enabled(pwm)) { + int err; + + err = pwm->chip->ops->enable(pwm->chip, pwm); + if (!err) + pwm->state.enabled = true; + + return err; + } return pwm ? 0 : -EINVAL; } @@ -507,8 +514,10 @@ EXPORT_SYMBOL_GPL(pwm_enable); */ void pwm_disable(struct pwm_device *pwm) { - if (pwm && test_and_clear_bit(PWMF_ENABLED, &pwm->flags)) + if (pwm && pwm_is_enabled(pwm)) { pwm->chip->ops->disable(pwm->chip, pwm); + pwm->state.enabled = false; + } } EXPORT_SYMBOL_GPL(pwm_disable); diff --git a/include/linux/pwm.h b/include/linux/pwm.h index e0e0ed8..433a097 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -75,8 +75,7 @@ enum pwm_polarity { enum { PWMF_REQUESTED = 1 << 0, - PWMF_ENABLED = 1 << 1, - PWMF_EXPORTED = 1 << 2, + PWMF_EXPORTED = 1 << 1, }; /* @@ -84,11 +83,13 @@ enum { * @period: PWM period (in nanoseconds) * @duty_cycle: PWM duty cycle (in nanoseconds) * @polarity: PWM polarity + * @enabled: PWM enabled status */ struct pwm_state { unsigned int period; unsigned int duty_cycle; enum pwm_polarity polarity; + bool enabled; }; /** @@ -114,7 +115,7 @@ struct pwm_device { static inline bool pwm_is_enabled(const struct pwm_device *pwm) { - return test_bit(PWMF_ENABLED, &pwm->flags); + return pwm->state.enabled; } static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period) -- 1.9.1