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From d31ea8b61f04341c8ea4b19105ca5772e655518f Mon Sep 17 00:00:00 2001
From: Jiri Pinkava <jiri.pinkava@vscht.cz>
Date: Mon, 24 May 2010 10:38:19 +0200
Subject: [PATCH 06/14] n35: Add LCD backlight regulation on Acer n35
Signed-off-by: Jiri Pinkava <jiri.pinkava@vscht.cz>
---
arch/arm/mach-s3c2410/mach-n30.c | 71 ++++++++++++++++++++++++++++++++++++++
1 files changed, 71 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-s3c2410/mach-n30.c b/arch/arm/mach-s3c2410/mach-n30.c
index be5235d..4199143 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>
@@ -369,6 +370,74 @@ static struct s3c2410fb_mach_info n30_fb_info __initdata = {
.lpcsel = 0x06,
};
+static int n35_backlight_init(struct device *dev)
+{
+ int ret;
+
+ ret = gpio_request(S3C2410_GPB(0), "Backlight PWM output");
+ if (ret)
+ goto request_gpb0_fail;
+ ret = gpio_request(S3C2410_GPB(1), "Backlight power");
+ if (ret)
+ goto request_gpb1_fail;
+
+ /* set GPB0 as output of PWM timer */
+ gpio_set_value(S3C2410_GPB(0), 0);
+ s3c_gpio_setpull(S3C2410_GPB(0), S3C_GPIO_PULL_DOWN);
+ s3c_gpio_cfgpin(S3C2410_GPB(0), S3C2410_GPB0_TOUT0);
+
+ /* backlight power */
+ ret = gpio_direction_output(S3C2410_GPB(1), 1);
+ if (ret)
+ goto direction_gpb1_fail;
+ s3c_gpio_setpull(S3C2410_GPB(1), S3C_GPIO_PULL_UP);
+
+ return 0;
+
+direction_gpb1_fail:
+ gpio_free(S3C2410_GPB(1));
+request_gpb1_fail:
+ gpio_free(S3C2410_GPB(0));
+request_gpb0_fail:
+ return ret;
+}
+
+static int n35_backlight_notify(struct device *dev, int brightness)
+{
+ /* power off backlight, values less than 14 are useless */
+ gpio_set_value(S3C2410_GPB(1), brightness > 14 ? 1 : 0);
+ return (brightness > 14 ? brightness : 0);
+}
+
+static void n35_backlight_exit(struct device *dev)
+{
+ gpio_direction_output(S3C2410_GPB(0), 0);
+ gpio_free(S3C2410_GPB(0));
+
+ gpio_set_value(S3C2410_GPB(1), 0);
+ s3c_gpio_setpull(S3C2410_GPB(1), S3C_GPIO_PULL_UP);
+ gpio_free(S3C2410_GPB(1));
+}
+
+static struct platform_pwm_backlight_data backlight_data = {
+ .pwm_id = 0,
+ .max_brightness = 100,
+ .dft_brightness = 50,
+ .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) {
@@ -416,6 +485,8 @@ static struct platform_device *n35_devices[] __initdata = {
&s3c_device_sdi,
&s3c_device_adc,
&s3c_device_ts,
+ &s3c_device_timer[0],
+ &n35_backlight,
&n35_button_device,
&n35_blue_led,
&n35_warning_led,
--
1.7.3.1
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