From: Jiri.Pinkava@vscht•cz (Pinkava J.)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 8/8] Add support for backlight regulation on Acer n35
Date: Thu, 6 May 2010 15:24:15 +0200 [thread overview]
Message-ID: <4BE2C2FF.8020404@vscht.cz> (raw)
In-Reply-To: <4BE2C2CC.2010003@vscht.cz>
Signed-off-by: Jiri Pinkava <jiri.pinkava@vscht•cz>
---
arch/arm/mach-s3c2410/mach-n30.c | 57 ++++++++++++++++++++++++++++++++++++++
1 files changed, 57 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-s3c2410/mach-n30.c b/arch/arm/mach-s3c2410/mach-n30.c
index f25275e..4c37c71 100644
--- a/arch/arm/mach-s3c2410/mach-n30.c
+++ b/arch/arm/mach-s3c2410/mach-n30.c
@@ -23,6 +23,7 @@
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
+#include <linux/pwm_backlight.h>
#include <linux/serial_core.h>
#include <linux/timer.h>
#include <linux/io.h>
@@ -352,6 +353,60 @@ static struct s3c2410fb_mach_info n30_fb_info __initdata = {
.lpcsel = 0x06,
};
+static int n35_backlight_init(struct device *dev)
+{
+ gpio_request(S3C2410_GPB(0), "Backlight PWM");
+ gpio_request(S3C2410_GPB(1), "Backlight power driver");
+
+ /* set GPIO as output for timer */
+ s3c2410_gpio_setpin(S3C2410_GPB(0), 0);
+ s3c2410_gpio_pullup(S3C2410_GPB(0), 0);
+ s3c2410_gpio_cfgpin(S3C2410_GPB(0), S3C2410_GPB0_TOUT0);
+
+ /* setup backlight power driving GPIO */
+ s3c2410_gpio_pullup(S3C2410_GPB(1), 1);
+ s3c2410_gpio_cfgpin(S3C2410_GPB(1), S3C2410_GPIO_OUTPUT);
+
+ return 0;
+}
+
+static int n35_backlight_notify(struct device *dev, int brightness)
+{
+ /* power off backlight, values less than 12 ar useless */
+ s3c2410_gpio_setpin(S3C2410_GPB(1), brightness > 12 ? 1 : 0);
+ return (brightness > 12 ? brightness : 0);
+}
+
+static void n35_backlight_exit(struct device *dev)
+{
+ s3c2410_gpio_cfgpin(S3C2410_GPB(0), 1/*S3C2410_GPB0_OUTP*/);
+ s3c2410_gpio_setpin(S3C2410_GPB(1), 0); /* co stim */
+ /* power off backlight */
+ s3c2410_gpio_pullup(S3C2410_GPB(1), 0);
+ gpio_free(S3C2410_GPB(1));
+ gpio_free(S3C2410_GPB(0));
+}
+
+static struct platform_pwm_backlight_data backlight_data = {
+ .pwm_id = 0,
+ .max_brightness = 100,
+ .dft_brightness = 50,
+ /* tcnt = 0x31, FIXME: compute some nicer value */
+ .pwm_period_ns = 3*1000*1000,
+ .init = n35_backlight_init,
+ .notify = n35_backlight_notify,
+ .exit = n35_backlight_exit,
+};
+
+static struct platform_device n35_backlight = {
+ .name = "pwm-backlight",
+ .dev = {
+ .parent = &s3c_device_timer[0].dev,
+ .platform_data = &backlight_data,
+ },
+ .id = -1,
+};
+
static void n30_sdi_set_power(unsigned char power_mode, unsigned short vdd)
{
switch (power_mode) {
@@ -395,6 +450,8 @@ static struct platform_device *n35_devices[] __initdata = {
&s3c_device_rtc,
&s3c_device_usbgadget,
&s3c_device_sdi,
+ &s3c_device_timer[0],
+ &n35_backlight,
&n35_button_device,
&n35_blue_led,
&n35_warning_led,
--
1.7.1
next prev parent reply other threads:[~2010-05-06 13:24 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-05 22:06 [PATCH 1/9] Enable Acer n35 architecture if Acer n30 is selected Pinkava J.
2010-05-05 22:12 ` [PATCH 2/9] fix: suspended wrong USB port on Acer n35 Pinkava J.
2010-05-05 22:13 ` [PATCH 3/9] Add RTC platform device for Acer n30 / " Pinkava J.
2010-05-05 22:17 ` [PATCH 4/9] Add support for blue LED on " Pinkava J.
2010-05-05 22:17 ` [PATCH 5/9] Add support for red flashing " Pinkava J.
2010-05-05 22:18 ` [PATCH 6/9] Enable wake-up by Power button " Pinkava J.
2010-05-05 22:20 ` [PATCH 7/9] Add support for MMC card reader on Acer n30 / " Pinkava J.
2010-05-05 22:22 ` [PATCH 8/9] Add support for power on/off on Acer n30 / Acer n35 MMC card reader Pinkava J.
2010-05-06 1:23 ` [PATCH 7/9] Add support for MMC card reader on Acer n30 / Acer n35 Ben Dooks
2010-05-06 1:22 ` [PATCH 5/9] Add support for red flashing LED on " Ben Dooks
2010-05-06 13:18 ` [PATCH 1/8] Enable Acer n35 architecture if Acer n30 is selected Pinkava J.
2010-05-06 13:19 ` [PATCH 2/8] fix: suspended wrong USB port on Acer n35 Pinkava J.
2010-05-06 13:20 ` [PATCH 3/8] Add RTC platform device for Acer n30 / " Pinkava J.
2010-05-06 13:21 ` [PATCH 4/8] Add support for LEDs on " Pinkava J.
2010-05-06 13:21 ` [PATCH 5/8] Enable wake-up by Power button " Pinkava J.
2010-05-06 13:22 ` [PATCH 6/8] Add support for MMC card reader on Acer n30 / " Pinkava J.
2010-05-06 13:23 ` [PATCH 7/8] Add support for power on/off on Acer n30 / Acer n35 MMC card reader Pinkava J.
2010-05-06 13:24 ` Pinkava J. [this message]
2010-05-06 13:39 ` Acer n35 patches Pinkava J.
2010-05-07 0:37 ` Ben Dooks
2010-05-12 13:26 ` Pinkava J.
2010-05-07 0:35 ` [PATCH 8/8] Add support for backlight regulation on Acer n35 Ben Dooks
2010-05-12 13:18 ` Pinkava J.
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