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    Subject[PATCH v7 3/8] Loongson: YeeLoong: add backlight driver
    Date
    From: Wu Zhangjin <wuzhangjin@gmail.com>

    This patch adds YeeLoong Backlight Driver, it provides standard
    interface(/sys/class/backlight/) for user-space applications(e.g.
    kpowersave, gnome-power-manager) to control the brightness of the
    backlight.

    Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
    ---
    drivers/platform/mips/Kconfig | 1 +
    drivers/platform/mips/yeeloong_laptop.c | 79 +++++++++++++++++++++++++++++++
    2 files changed, 80 insertions(+), 0 deletions(-)

    diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
    index 76f0250..f7a3705 100644
    --- a/drivers/platform/mips/Kconfig
    +++ b/drivers/platform/mips/Kconfig
    @@ -17,6 +17,7 @@ if MIPS_PLATFORM_DEVICES
    config LEMOTE_YEELOONG2F
    tristate "Lemote YeeLoong Laptop"
    depends on LEMOTE_MACH2F
    + select BACKLIGHT_CLASS_DEVICE
    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 85fc7ed..fbc4ebb 100644
    --- a/drivers/platform/mips/yeeloong_laptop.c
    +++ b/drivers/platform/mips/yeeloong_laptop.c
    @@ -11,6 +11,77 @@

    #include <linux/err.h>
    #include <linux/platform_device.h>
    +#include <linux/backlight.h> /* for backlight subdriver */
    +#include <linux/fb.h>
    +
    +#include <ec_kb3310b.h>
    +
    +/* backlight subdriver */
    +#define MAX_BRIGHTNESS 8
    +
    +static int yeeloong_set_brightness(struct backlight_device *bd)
    +{
    + unsigned int level, current_level;
    + static unsigned int old_level;
    +
    + level = (bd->props.fb_blank == FB_BLANK_UNBLANK &&
    + bd->props.power == FB_BLANK_UNBLANK) ?
    + bd->props.brightness : 0;
    +
    + if (level > MAX_BRIGHTNESS)
    + level = MAX_BRIGHTNESS;
    + else if (level < 0)
    + level = 0;
    +
    + /* Avoid to modify the brightness when EC is tuning it */
    + current_level = ec_read(REG_DISPLAY_BRIGHTNESS);
    + if ((old_level == current_level) && (old_level != level))
    + ec_write(REG_DISPLAY_BRIGHTNESS, level);
    + old_level = level;
    +
    + return 0;
    +}
    +
    +static int yeeloong_get_brightness(struct backlight_device *bd)
    +{
    + return (int)ec_read(REG_DISPLAY_BRIGHTNESS);
    +}
    +
    +static struct backlight_ops backlight_ops = {
    + .get_brightness = yeeloong_get_brightness,
    + .update_status = yeeloong_set_brightness,
    +};
    +
    +static struct backlight_device *yeeloong_backlight_dev;
    +
    +static int yeeloong_backlight_init(void)
    +{
    + int ret;
    +
    + yeeloong_backlight_dev = backlight_device_register("backlight0", NULL,
    + NULL, &backlight_ops);
    +
    + if (IS_ERR(yeeloong_backlight_dev)) {
    + ret = PTR_ERR(yeeloong_backlight_dev);
    + yeeloong_backlight_dev = NULL;
    + return ret;
    + }
    +
    + yeeloong_backlight_dev->props.max_brightness = MAX_BRIGHTNESS;
    + yeeloong_backlight_dev->props.brightness =
    + yeeloong_get_brightness(yeeloong_backlight_dev);
    + backlight_update_status(yeeloong_backlight_dev);
    +
    + return 0;
    +}
    +
    +static void yeeloong_backlight_exit(void)
    +{
    + if (yeeloong_backlight_dev) {
    + backlight_device_unregister(yeeloong_backlight_dev);
    + yeeloong_backlight_dev = NULL;
    + }
    +}

    static struct platform_device_id platform_device_ids[] = {
    {
    @@ -42,11 +113,19 @@ static int __init yeeloong_init(void)
    return ret;
    }

    + ret = yeeloong_backlight_init();
    + if (ret) {
    + pr_err("Fail to register yeeloong backlight driver.\n");
    + yeeloong_backlight_exit();
    + return ret;
    + }
    +
    return 0;
    }

    static void __exit yeeloong_exit(void)
    {
    + yeeloong_backlight_exit();
    platform_driver_unregister(&platform_driver);

    pr_info("Unload YeeLoong Platform Specific Driver.\n");
    --
    1.6.2.1


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