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[PATCH 5/9] Loongson: YeeLoong: add video output driver

To: Ralf Baechle <ralf@linux-mips.org>
Subject: [PATCH 5/9] Loongson: YeeLoong: add video output driver
From: Wu Zhangjin <wuzhangjin@gmail.com>
Date: Sun, 23 May 2010 21:58:00 +0800
Cc: linux-mips@linux-mips.org, Wu Zhangjin <wuzhangjin@gmail.com>
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In-reply-to: <cover.1274622624.git.wuzhangjin@gmail.com>
In-reply-to: <cover.1274622624.git.wuzhangjin@gmail.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <cover.1274622624.git.wuzhangjin@gmail.com>
References: <cover.1274622624.git.wuzhangjin@gmail.com>
Sender: linux-mips-bounce@linux-mips.org
This patch adds Video Output Driver, it provides standard
interface(/sys/class/video_output) to turn on/off the video output of
LCD, CRT.

Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
---
 drivers/platform/mips/Kconfig           |    1 +
 drivers/platform/mips/yeeloong_laptop.c |  139 +++++++++++++++++++++++++++++++
 2 files changed, 140 insertions(+), 0 deletions(-)

diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
index d4ce744..e1285f7 100644
--- a/drivers/platform/mips/Kconfig
+++ b/drivers/platform/mips/Kconfig
@@ -19,6 +19,7 @@ config LEMOTE_YEELOONG2F
        depends on LEMOTE_MACH2F
        select BACKLIGHT_CLASS_DEVICE
        select HWMON
+       select VIDEO_OUTPUT_CONTROL
        help
          YeeLoong netbook is a mini laptop made by Lemote, which is basically
          compatible to FuLoong2F mini PC, but it has an extra Embedded
diff --git a/drivers/platform/mips/yeeloong_laptop.c 
b/drivers/platform/mips/yeeloong_laptop.c
index a422acb..9fd70ae 100644
--- a/drivers/platform/mips/yeeloong_laptop.c
+++ b/drivers/platform/mips/yeeloong_laptop.c
@@ -14,6 +14,7 @@
 #include <linux/fb.h>
 #include <linux/hwmon.h>       /* for hwmon subdriver */
 #include <linux/hwmon-sysfs.h>
+#include <linux/video_output.h>        /* for video output subdriver */
 
 #include <ec_kb3310b.h>
 
@@ -323,6 +324,136 @@ static void yeeloong_hwmon_exit(void)
        }
 }
 
+/* video output subdriver */
+
+static int lcd_video_output_get(struct output_device *od)
+{
+       return ec_read(REG_DISPLAY_LCD);
+}
+
+#define LCD    0
+#define CRT    1
+
+static void display_vo_set(int display, int on)
+{
+       int addr;
+       unsigned long value;
+
+       addr = (display == LCD) ? 0x31 : 0x21;
+
+       outb(addr, 0x3c4);
+       value = inb(0x3c5);
+
+       if (display == LCD)
+               value |= (on ? 0x03 : 0x02);
+       else {
+               if (on)
+                       clear_bit(7, &value);
+               else
+                       set_bit(7, &value);
+       }
+
+       outb(addr, 0x3c4);
+       outb(value, 0x3c5);
+}
+
+static int lcd_video_output_set(struct output_device *od)
+{
+       unsigned long status;
+
+       status = !!od->request_state;
+
+       display_vo_set(LCD, status);
+       ec_write(REG_BACKLIGHT_CTRL, status);
+
+       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)
+{
+       unsigned long status;
+
+       status = !!od->request_state;
+
+       if (ec_read(REG_CRT_DETECT) == BIT_CRT_DETECT_PLUG)
+               display_vo_set(CRT, status);
+
+       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;
+
+static void yeeloong_lcd_vo_set(int status)
+{
+       lcd_output_dev->request_state = status;
+       lcd_video_output_set(lcd_output_dev);
+}
+
+static void yeeloong_crt_vo_set(int status)
+{
+       crt_output_dev->request_state = status;
+       crt_video_output_set(crt_output_dev);
+}
+
+static int yeeloong_vo_init(void)
+{
+       int ret;
+
+       /* 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 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;
+       }
+}
+
 static struct platform_device_id platform_device_ids[] = {
        {
                .name = "yeeloong_laptop",
@@ -367,11 +498,19 @@ static int __init yeeloong_init(void)
                return ret;
        }
 
+       ret = yeeloong_vo_init();
+       if (ret) {
+               pr_err("Fail to register yeeloong video output driver.\n");
+               yeeloong_vo_exit();
+               return ret;
+       }
+
        return 0;
 }
 
 static void __exit yeeloong_exit(void)
 {
+       yeeloong_vo_exit();
        yeeloong_hwmon_exit();
        yeeloong_backlight_exit();
        platform_driver_unregister(&platform_driver);
-- 
1.7.0.4


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