1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/video/exynos_pwm_bl.c b/drivers/video/exynos_pwm_bl.c
new file mode 100644
index 0000000..27fb0b5
--- /dev/null
+++ b/drivers/video/exynos_pwm_bl.c
@@ -0,0 +1,57 @@
+/*
+ * PWM BACKLIGHT driver for Board based on EXYNOS.
+ *
+ * Author: Donghwa Lee  <dh09.lee@samsung.com>
+ *
+ * Derived from linux/drivers/video/backlight/pwm_backlight.c
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include <common.h>
+#include <pwm.h>
+#include <linux/types.h>
+#include <asm/io.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/pwm.h>
+#include <asm/arch/pwm_backlight.h>
+
+static struct pwm_backlight_data *pwm;
+
+static int exynos_pwm_backlight_update_status(void)
+{
+	int brightness = pwm->brightness;
+	int max = pwm->max_brightness;
+
+	if (brightness == 0) {
+		pwm_config(pwm->pwm_id, 0, pwm->period);
+		pwm_disable(pwm->pwm_id);
+	} else {
+		pwm_config(pwm->pwm_id,
+			brightness * pwm->period / max, pwm->period);
+		pwm_enable(pwm->pwm_id);
+	}
+	return 0;
+}
+
+int exynos_pwm_backlight_init(struct pwm_backlight_data *pd)
+{
+	pwm = pd;
+
+	exynos_pwm_backlight_update_status();
+
+	return 0;
+}