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    Subject[PATCH] toshiba_acpi: Add support for transflective LCD
    Some Toshiba laptops have the transflective LCD and toshset
    can control its backlight state. I brought this feature to the
    mainline. It was tested on a Toshiba Portege R500.

    Signed-off-by: Akio Idehara <zbe64533@gmail.com>
    ---
    drivers/platform/x86/toshiba_acpi.c | 43 ++++++++++++++++++++++++++++++++++-
    1 files changed, 42 insertions(+), 1 deletions(-)

    diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
    index dcdc1f4..af3979c 100644
    --- a/drivers/platform/x86/toshiba_acpi.c
    +++ b/drivers/platform/x86/toshiba_acpi.c
    @@ -51,6 +51,7 @@
    #include <linux/input.h>
    #include <linux/input/sparse-keymap.h>
    #include <linux/leds.h>
    +#include <linux/fb.h>
    #include <linux/slab.h>

    #include <asm/uaccess.h>
    @@ -88,6 +89,7 @@ MODULE_LICENSE("GPL");

    /* registers */
    #define HCI_FAN 0x0004
    +#define HCI_TR_BACKLIGHT 0x0005
    #define HCI_SYSTEM_EVENT 0x0016
    #define HCI_VIDEO_OUT 0x001c
    #define HCI_HOTKEY_EVENT 0x001e
    @@ -122,6 +124,7 @@ struct toshiba_acpi_dev {
    int video_supported:1;
    int fan_supported:1;
    int system_event_supported:1;
    + int tr_backlight_supported:1;

    struct mutex mutex;
    };
    @@ -461,6 +464,22 @@ static const struct rfkill_ops toshiba_rfk_ops = {
    .poll = bt_rfkill_poll,
    };

    +static int get_tr_backlight_status(struct toshiba_acpi_dev *dev, u32 *status)
    +{
    + u32 hci_result;
    +
    + hci_read1(dev, HCI_TR_BACKLIGHT, status, &hci_result);
    + return hci_result == HCI_SUCCESS ? 0 : -EIO;
    +}
    +
    +static int set_tr_backlight_status(struct toshiba_acpi_dev *dev, int value)
    +{
    + u32 hci_result;
    +
    + hci_write1(dev, HCI_TR_BACKLIGHT, value, &hci_result);
    + return hci_result == HCI_SUCCESS ? 0 : -EIO;
    +}
    +
    static struct proc_dir_entry *toshiba_proc_dir /*= 0*/ ;

    static int get_lcd(struct backlight_device *bd)
    @@ -512,8 +531,19 @@ static int set_lcd(struct toshiba_acpi_dev *dev, int value)

    static int set_lcd_status(struct backlight_device *bd)
    {
    + int ret;
    struct toshiba_acpi_dev *dev = bl_get_data(bd);
    - return set_lcd(dev, bd->props.brightness);
    +
    + ret = set_lcd(dev, bd->props.brightness);
    + if (ret)
    + return ret;
    +
    + if (dev->tr_backlight_supported) {
    + int value = (bd->props.power == FB_BLANK_UNBLANK) ? 1 : 0;
    + ret = set_tr_backlight_status(dev, value);
    + }
    +
    + return ret;
    }

    static ssize_t lcd_proc_write(struct file *file, const char __user *buf,
    @@ -938,6 +968,7 @@ static int __devinit toshiba_acpi_add(struct acpi_device *acpi_dev)
    const char *hci_method;
    u32 hci_result;
    u32 dummy;
    + u32 value;
    bool bt_present;
    int ret = 0;
    struct backlight_properties props;
    @@ -984,6 +1015,16 @@ static int __devinit toshiba_acpi_add(struct acpi_device *acpi_dev)
    }
    dev->backlight_dev->props.brightness = get_lcd(dev->backlight_dev);

    + /* Determine whether or not BIOS supports transflective backlight */
    + ret = get_tr_backlight_status(dev, &value) ? false : true;
    + dev->tr_backlight_supported = ret;
    + if (ret) {
    + int power = value ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
    + dev->backlight_dev->props.power = power;
    + } else {
    + dev->backlight_dev->props.power = FB_BLANK_UNBLANK;
    + }
    +
    /* Register rfkill switch for Bluetooth */
    if (hci_get_bt_present(dev, &bt_present) == HCI_SUCCESS && bt_present) {
    dev->bt_rfk = rfkill_alloc("Toshiba Bluetooth",
    --
    1.7.7.6

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