[PATCH v6 6/8] Loongson: YeeLoong: add video output driver

[Wu Zhangin <wuzhangjin@gmail.com>]

From: Wu Zhangjin <wuzhangjin@gmail.com>

This patch adds Video Output Driver, which provides standard interface
to turn on/off the video output of LCD, CRT.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
---
 .../loongson/lemote-2f/yeeloong_laptop/Kconfig     |    8 +
 .../loongson/lemote-2f/yeeloong_laptop/Makefile    |    1 +
 .../lemote-2f/yeeloong_laptop/ec_kb3310b.h         |    3 +
 .../loongson/lemote-2f/yeeloong_laptop/yl_vo.c     |  168 ++++++++++++++++++++
 4 files changed, 180 insertions(+), 0 deletions(-)
 create mode 100644 arch/mips/loongson/lemote-2f/yeeloong_laptop/yl_vo.c

diff --git a/arch/mips/loongson/lemote-2f/yeeloong_laptop/Kconfig b/arch/mips/loongson/lemote-2f/yeeloong_laptop/Kconfig
index d13e1ab..7cf6071 100644
--- a/arch/mips/loongson/lemote-2f/yeeloong_laptop/Kconfig
+++ b/arch/mips/loongson/lemote-2f/yeeloong_laptop/Kconfig
@@ -37,4 +37,12 @@ config YEELOONG_HWMON
 	  interface for lm-sensors to monitor the temperatures of CPU and
 	  battery, the PWM of fan, the current, voltage of battery.
 
+config YEELOONG_VO
+	tristate "Video Output Driver"
+	select VIDEO_OUTPUT_CONTROL
+	default y
+	help
+	  This option adds Video Output Driver, which provides standard
+	  interface to turn on/off the video output of LCD, CRT.
+
 endif
diff --git a/arch/mips/loongson/lemote-2f/yeeloong_laptop/Makefile b/arch/mips/loongson/lemote-2f/yeeloong_laptop/Makefile
index b38fb2a..aa01140 100644
--- a/arch/mips/loongson/lemote-2f/yeeloong_laptop/Makefile
+++ b/arch/mips/loongson/lemote-2f/yeeloong_laptop/Makefile
@@ -5,3 +5,4 @@ obj-y += ec_kb3310b.o
 obj-$(CONFIG_YEELOONG_BACKLIGHT) += yl_backlight.o
 obj-$(CONFIG_YEELOONG_BATTERY) += yl_battery.o
 obj-$(CONFIG_YEELOONG_HWMON) += yl_hwmon.o
+obj-$(CONFIG_YEELOONG_VO) += yl_vo.o
diff --git a/arch/mips/loongson/lemote-2f/yeeloong_laptop/ec_kb3310b.h b/arch/mips/loongson/lemote-2f/yeeloong_laptop/ec_kb3310b.h
index 0e3b5ad..9d06ad8 100644
--- a/arch/mips/loongson/lemote-2f/yeeloong_laptop/ec_kb3310b.h
+++ b/arch/mips/loongson/lemote-2f/yeeloong_laptop/ec_kb3310b.h
@@ -22,6 +22,9 @@ extern int ec_get_event_num(void);
 typedef int (*sci_handler) (int status);
 extern sci_handler yeeloong_report_lid_status;
 
+extern void yeeloong_lcd_vo_set(int status);
+extern void yeeloong_crt_vo_set(int status);
+
 #define SCI_IRQ_NUM 0x0A
 #define MAX_BRIGHTNESS 8
 
diff --git a/arch/mips/loongson/lemote-2f/yeeloong_laptop/yl_vo.c b/arch/mips/loongson/lemote-2f/yeeloong_laptop/yl_vo.c
new file mode 100644
index 0000000..db19a25
--- /dev/null
+++ b/arch/mips/loongson/lemote-2f/yeeloong_laptop/yl_vo.c
@@ -0,0 +1,168 @@
+/*
+ * YeeLoong Video Output Driver
+ *
+ *  Copyright (C) 2009 Lemote Inc.
+ *  Author: Wu Zhangjin <wuzj@lemote.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/video_output.h>
+
+#include <asm/bootinfo.h>
+
+#include "ec_kb3310b.h"
+
+MODULE_AUTHOR("Wu Zhangjin <wuzj@lemote.com>");
+MODULE_DESCRIPTION("YeeLoong laptop video output driver");
+MODULE_LICENSE("GPL");
+
+static int lcd_video_output_get(struct output_device *od)
+{
+	return ec_read(REG_DISPLAY_LCD);
+}
+
+static int lcd_video_output_set(struct output_device *od)
+{
+	int value;
+	unsigned long status;
+
+	status = !!od->request_state;
+
+	if (status == BIT_DISPLAY_LCD_ON) {
+		/* Turn on LCD */
+		outb(0x31, 0x3c4);
+		value = inb(0x3c5);
+		value = (value & 0xf8) | 0x03;
+		outb(0x31, 0x3c4);
+		outb(value, 0x3c5);
+		/* Turn on backlight */
+		ec_write(REG_BACKLIGHT_CTRL, BIT_BACKLIGHT_ON);
+	} else {
+		/* Turn off backlight */
+		ec_write(REG_BACKLIGHT_CTRL, BIT_BACKLIGHT_OFF);
+		/* Turn off LCD */
+		outb(0x31, 0x3c4);
+		value = inb(0x3c5);
+		value = (value & 0xf8) | 0x02;
+		outb(0x31, 0x3c4);
+		outb(value, 0x3c5);
+	}
+
+	return 0;
+}
+
+static struct output_properties lcd_output_properties = {
+	.set_state = lcd_video_output_set,
+	.get_status = lcd_video_output_get,
+};
+
+static int crt_video_output_get(struct output_device *od)
+{
+	return ec_read(REG_CRT_DETECT);
+}
+
+static int crt_video_output_set(struct output_device *od)
+{
+	int value;
+	unsigned long status;
+
+	status = !!od->request_state;
+
+	if (status == BIT_CRT_DETECT_PLUG) {
+		if (ec_read(REG_CRT_DETECT) == BIT_CRT_DETECT_PLUG) {
+			/* Turn on CRT */
+			outb(0x21, 0x3c4);
+			value = inb(0x3c5);
+			value &= ~(1 << 7);
+			outb(0x21, 0x3c4);
+			outb(value, 0x3c5);
+		}
+	} else {
+		/* Turn off CRT */
+		outb(0x21, 0x3c4);
+		value = inb(0x3c5);
+		value |= (1 << 7);
+		outb(0x21, 0x3c4);
+		outb(value, 0x3c5);
+	}
+
+	return 0;
+}
+
+static struct output_properties crt_output_properties = {
+	.set_state = crt_video_output_set,
+	.get_status = crt_video_output_get,
+};
+
+static struct output_device *lcd_output_dev, *crt_output_dev;
+
+void yeeloong_lcd_vo_set(int status)
+{
+	lcd_output_dev->request_state = status;
+	lcd_video_output_set(lcd_output_dev);
+}
+EXPORT_SYMBOL(yeeloong_lcd_vo_set);
+
+void yeeloong_crt_vo_set(int status)
+{
+	crt_output_dev->request_state = status;
+	crt_video_output_set(crt_output_dev);
+}
+EXPORT_SYMBOL(yeeloong_crt_vo_set);
+
+static int __init yeeloong_vo_init(void)
+{
+	int ret;
+
+	if (mips_machtype != MACH_LEMOTE_YL2F89) {
+		pr_err("This Driver is only for YeeLoong laptop\n");
+		return -EFAULT;
+	}
+
+
+	/* Register video output device: lcd, crt */
+	lcd_output_dev = video_output_register("LCD", NULL, NULL,
+			&lcd_output_properties);
+
+	if (IS_ERR(lcd_output_dev)) {
+		ret = PTR_ERR(lcd_output_dev);
+		lcd_output_dev = NULL;
+		return ret;
+	}
+	/* Ensure LCD is on by default */
+	yeeloong_lcd_vo_set(BIT_DISPLAY_LCD_ON);
+
+	crt_output_dev = video_output_register("CRT", NULL, NULL,
+			&crt_output_properties);
+
+	if (IS_ERR(crt_output_dev)) {
+		ret = PTR_ERR(crt_output_dev);
+		crt_output_dev = NULL;
+		return ret;
+	}
+
+	/* Turn off CRT by default, and will be enabled when the CRT
+	 * connectting event reported by SCI */
+	yeeloong_crt_vo_set(BIT_CRT_DETECT_UNPLUG);
+
+	return 0;
+}
+
+static void __exit yeeloong_vo_exit(void)
+{
+	if (lcd_output_dev) {
+		video_output_unregister(lcd_output_dev);
+		lcd_output_dev = NULL;
+	}
+	if (crt_output_dev) {
+		video_output_unregister(crt_output_dev);
+		crt_output_dev = NULL;
+	}
+}
+
+module_init(yeeloong_vo_init);
+module_exit(yeeloong_vo_exit);
-- 
1.6.2.1