[PATCH 08/16] backlight: pwm_bl: set pwm polarity when using platform data
From: Alexandre Belloni <hidden>
Date: 2014-03-19 13:17:55
Also in:
linux-arm-kernel, linux-leds, linux-pwm, lkml
Subsystem:
backlight class/subsystem, framebuffer layer, the rest · Maintainers:
Lee Jones, Daniel Thompson, Jingoo Han, Helge Deller, Linus Torvalds
Set inversed polarity when .pwm_active_low is set in the platform_data. With device tree, this is taken care of by of_pwm_xlate_with_flags(), called from of_pwm_get(). Signed-off-by: Alexandre Belloni <redacted> --- drivers/video/backlight/pwm_bl.c | 8 ++++++++ include/linux/pwm_backlight.h | 1 + 2 files changed, 9 insertions(+)
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index b75201ff46f6..ffdd3b2b2742 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c@@ -309,6 +309,14 @@ static int pwm_backlight_probe(struct platform_device *pdev) if (data->pwm_period_ns > 0) pwm_set_period(pb->pwm, data->pwm_period_ns); + /* + * The DT case is taking care of polarity in of_pwm_get(). For the + * non-DT case, set the polarity from platform data. + */ + if (data->pwm_active_low) + if (pwm_set_polarity(pb->pwm, PWM_POLARITY_INVERSED)) + dev_err(&pdev->dev, "impossible to invert polarity\n"); + pb->period = pwm_get_period(pb->pwm); pb->lth_brightness = data->lth_brightness * (pb->period / pb->scale);
diff --git a/include/linux/pwm_backlight.h b/include/linux/pwm_backlight.h
index 2de2e275b2cb..b924fce5c97a 100644
--- a/include/linux/pwm_backlight.h
+++ b/include/linux/pwm_backlight.h@@ -15,6 +15,7 @@ struct platform_pwm_backlight_data { unsigned int dft_brightness; unsigned int lth_brightness; unsigned int pwm_period_ns; + bool pwm_active_low; unsigned int *levels; int enable_gpio; unsigned long enable_gpio_flags;
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1.8.3.2