From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thierry Reding Subject: [PATCH v2 02/12] pwm-backlight: Refactor backlight power on/off Date: Mon, 7 Oct 2013 13:37:36 +0200 Message-ID: <1381145866-445-3-git-send-email-treding@nvidia.com> References: <1381145866-445-1-git-send-email-treding@nvidia.com> Return-path: In-Reply-To: <1381145866-445-1-git-send-email-treding@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org To: Thierry Reding Cc: Tony Lindgren , Eric Miao , Haojian Zhuang , Marek Vasut , Ben Dooks , Kukjin Kim , Guan Xuetao , devicetree@vger.kernel.org, linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org In preparation for adding an optional regulator and enable GPIO to the driver, split the power on and power off sequences into separate functions to reduce code duplication at the multiple call sites. Signed-off-by: Thierry Reding --- Changes in v2: - add back pwm_config(..., 0, ...) call on power off - move whitespace cleanups to separate patch drivers/video/backlight/pwm_bl.c | 53 +++++++++++++++++++++++----------------- 1 file changed, 31 insertions(+), 22 deletions(-) diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 774bce3..ab9d5e6 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -35,6 +35,31 @@ struct pwm_bl_data { void (*exit)(struct device *); }; +static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness, + int max) +{ + int duty_cycle, err; + + if (pb->levels) { + duty_cycle = pb->levels[brightness]; + max = pb->levels[max]; + } else { + duty_cycle = brightness; + } + + duty_cycle = (duty_cycle * (pb->period - pb->lth_brightness) / max) + + pb->lth_brightness; + + pwm_config(pb->pwm, duty_cycle, pb->period); + pwm_enable(pb->pwm); +} + +static void pwm_backlight_power_off(struct pwm_bl_data *pb) +{ + pwm_config(pb->pwm, 0, pb->period); + pwm_disable(pb->pwm); +} + static int pwm_backlight_update_status(struct backlight_device *bl) { struct pwm_bl_data *pb = bl_get_data(bl); @@ -49,24 +74,10 @@ static int pwm_backlight_update_status(struct backlight_device *bl) if (pb->notify) brightness = pb->notify(pb->dev, brightness); - if (brightness == 0) { - pwm_config(pb->pwm, 0, pb->period); - pwm_disable(pb->pwm); - } else { - int duty_cycle; - - if (pb->levels) { - duty_cycle = pb->levels[brightness]; - max = pb->levels[max]; - } else { - duty_cycle = brightness; - } - - duty_cycle = pb->lth_brightness + - (duty_cycle * (pb->period - pb->lth_brightness) / max); - pwm_config(pb->pwm, duty_cycle, pb->period); - pwm_enable(pb->pwm); - } + if (brightness > 0) + pwm_backlight_power_on(pb, brightness, max); + else + pwm_backlight_power_off(pb); if (pb->notify_after) pb->notify_after(pb->dev, brightness); @@ -267,8 +278,7 @@ static int pwm_backlight_remove(struct platform_device *pdev) struct pwm_bl_data *pb = bl_get_data(bl); backlight_device_unregister(bl); - pwm_config(pb->pwm, 0, pb->period); - pwm_disable(pb->pwm); + pwm_backlight_power_off(pb); if (pb->exit) pb->exit(&pdev->dev); @@ -285,8 +295,7 @@ static int pwm_backlight_suspend(struct device *dev) if (pb->notify) pb->notify(pb->dev, 0); - pwm_config(pb->pwm, 0, pb->period); - pwm_disable(pb->pwm); + pwm_backlight_power_off(pb); if (pb->notify_after) pb->notify_after(pb->dev, 0); -- 1.8.4