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[PATCH v7 6/8] Loongson: YeeLoong: add video output driver

To: Ralf Baechle <ralf@linux-mips.org>, akpm@linux-foundation.org, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org
Subject: [PATCH v7 6/8] Loongson: YeeLoong: add video output driver
From: Wu Zhangjin <wuzhangjin@gmail.com>
Date: Fri, 4 Dec 2009 21:36:43 +0800
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>, Pavel Machek <pavel@ucw.cz>, "Rafael J. Wysocki" <rjw@sisk.pl>, zhangfx@lemote.com, linux-laptop@vger.kernel.org, luming.yu@intel.com, Wu Zhangjin <wuzhangjin@gmail.com>
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In-reply-to: <cover.1259932036.git.wuzhangjin@gmail.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <cover.1259932036.git.wuzhangjin@gmail.com>
Sender: linux-mips-bounce@linux-mips.org
From: Wu Zhangjin <wuzhangjin@gmail.com>

This patch adds Video Output Driver, it provides standard
interface(/sys/class/video_output) to turn on/off the video output of
LCD, CRT.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
---
 drivers/platform/mips/Kconfig           |    1 +
 drivers/platform/mips/yeeloong_laptop.c |  147 +++++++++++++++++++++++++++++++
 2 files changed, 148 insertions(+), 0 deletions(-)

diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
index 9c8385c..4a89c01 100644
--- a/drivers/platform/mips/Kconfig
+++ b/drivers/platform/mips/Kconfig
@@ -21,6 +21,7 @@ config LEMOTE_YEELOONG2F
        select SYS_SUPPORTS_APM_EMULATION
        select APM_EMULATION
        select HWMON
+       select VIDEO_OUTPUT_CONTROL
        default m
        help
          YeeLoong netbook is a mini laptop made by Lemote, which is basically
diff --git a/drivers/platform/mips/yeeloong_laptop.c 
b/drivers/platform/mips/yeeloong_laptop.c
index 644aaa7..8378926 100644
--- a/drivers/platform/mips/yeeloong_laptop.c
+++ b/drivers/platform/mips/yeeloong_laptop.c
@@ -16,6 +16,7 @@
 #include <linux/apm-emulation.h>/* for battery subdriver */
 #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>
 
@@ -397,6 +398,144 @@ 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);
+}
+
+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;
+
+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",
@@ -443,11 +582,19 @@ 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_battery_exit();
        yeeloong_backlight_exit();
-- 
1.6.2.1


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