Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / video / backlight / generic_bl.c

diff --git a/kernel/drivers/video/backlight/generic_bl.c b/kernel/drivers/video/backlight/generic_bl.c
new file mode 100644 (file)
index 0000000..67dfb93
--- /dev/null
+++ b/kernel/drivers/video/backlight/generic_bl.c
@@ -0,0 +1,119 @@
+/*
+ *  Generic Backlight Driver
+ *
+ *  Copyright (c) 2004-2008 Richard Purdie
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+
+static int genericbl_intensity;
+static struct backlight_device *generic_backlight_device;
+static struct generic_bl_info *bl_machinfo;
+
+/* Flag to signal when the battery is low */
+#define GENERICBL_BATTLOW       BL_CORE_DRIVER1
+
+static int genericbl_send_intensity(struct backlight_device *bd)
+{
+       int intensity = bd->props.brightness;
+
+       if (bd->props.power != FB_BLANK_UNBLANK)
+               intensity = 0;
+       if (bd->props.state & BL_CORE_FBBLANK)
+               intensity = 0;
+       if (bd->props.state & BL_CORE_SUSPENDED)
+               intensity = 0;
+       if (bd->props.state & GENERICBL_BATTLOW)
+               intensity &= bl_machinfo->limit_mask;
+
+       bl_machinfo->set_bl_intensity(intensity);
+
+       genericbl_intensity = intensity;
+
+       if (bl_machinfo->kick_battery)
+               bl_machinfo->kick_battery();
+
+       return 0;
+}
+
+static int genericbl_get_intensity(struct backlight_device *bd)
+{
+       return genericbl_intensity;
+}
+
+static const struct backlight_ops genericbl_ops = {
+       .options = BL_CORE_SUSPENDRESUME,
+       .get_brightness = genericbl_get_intensity,
+       .update_status  = genericbl_send_intensity,
+};
+
+static int genericbl_probe(struct platform_device *pdev)
+{
+       struct backlight_properties props;
+       struct generic_bl_info *machinfo = dev_get_platdata(&pdev->dev);
+       const char *name = "generic-bl";
+       struct backlight_device *bd;
+
+       bl_machinfo = machinfo;
+       if (!machinfo->limit_mask)
+               machinfo->limit_mask = -1;
+
+       if (machinfo->name)
+               name = machinfo->name;
+
+       memset(&props, 0, sizeof(struct backlight_properties));
+       props.type = BACKLIGHT_RAW;
+       props.max_brightness = machinfo->max_intensity;
+       bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev,
+                                       NULL, &genericbl_ops, &props);
+       if (IS_ERR(bd))
+               return PTR_ERR(bd);
+
+       platform_set_drvdata(pdev, bd);
+
+       bd->props.power = FB_BLANK_UNBLANK;
+       bd->props.brightness = machinfo->default_intensity;
+       backlight_update_status(bd);
+
+       generic_backlight_device = bd;
+
+       dev_info(&pdev->dev, "Generic Backlight Driver Initialized.\n");
+       return 0;
+}
+
+static int genericbl_remove(struct platform_device *pdev)
+{
+       struct backlight_device *bd = platform_get_drvdata(pdev);
+
+       bd->props.power = 0;
+       bd->props.brightness = 0;
+       backlight_update_status(bd);
+
+       dev_info(&pdev->dev, "Generic Backlight Driver Unloaded\n");
+       return 0;
+}
+
+static struct platform_driver genericbl_driver = {
+       .probe          = genericbl_probe,
+       .remove         = genericbl_remove,
+       .driver         = {
+               .name   = "generic-bl",
+       },
+};
+
+module_platform_driver(genericbl_driver);
+
+MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
+MODULE_DESCRIPTION("Generic Backlight Driver");
+MODULE_LICENSE("GPL");