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