Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/drivers/video/backlight/platform_lcd.c b/kernel/drivers/video/backlight/platform_lcd.c
new file mode 100644 (file)
index 0000000..872a3bf
--- /dev/null
+++ b/kernel/drivers/video/backlight/platform_lcd.c
@@ -0,0 +1,161 @@
+/* drivers/video/backlight/platform_lcd.c
+ *
+ * Copyright 2008 Simtec Electronics
+ *     Ben Dooks <ben@simtec.co.uk>
+ *
+ * Generic platform-device LCD power control interface.
+ *
+ * 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/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/lcd.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+#include <video/platform_lcd.h>
+
+struct platform_lcd {
+       struct device           *us;
+       struct lcd_device       *lcd;
+       struct plat_lcd_data    *pdata;
+
+       unsigned int             power;
+       unsigned int             suspended:1;
+};
+
+static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd)
+{
+       return lcd_get_data(lcd);
+}
+
+static int platform_lcd_get_power(struct lcd_device *lcd)
+{
+       struct platform_lcd *plcd = to_our_lcd(lcd);
+
+       return plcd->power;
+}
+
+static int platform_lcd_set_power(struct lcd_device *lcd, int power)
+{
+       struct platform_lcd *plcd = to_our_lcd(lcd);
+       int lcd_power = 1;
+
+       if (power == FB_BLANK_POWERDOWN || plcd->suspended)
+               lcd_power = 0;
+
+       plcd->pdata->set_power(plcd->pdata, lcd_power);
+       plcd->power = power;
+
+       return 0;
+}
+
+static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)
+{
+       struct platform_lcd *plcd = to_our_lcd(lcd);
+       struct plat_lcd_data *pdata = plcd->pdata;
+
+       if (pdata->match_fb)
+               return pdata->match_fb(pdata, info);
+
+       return plcd->us->parent == info->device;
+}
+
+static struct lcd_ops platform_lcd_ops = {
+       .get_power      = platform_lcd_get_power,
+       .set_power      = platform_lcd_set_power,
+       .check_fb       = platform_lcd_match,
+};
+
+static int platform_lcd_probe(struct platform_device *pdev)
+{
+       struct plat_lcd_data *pdata;
+       struct platform_lcd *plcd;
+       struct device *dev = &pdev->dev;
+       int err;
+
+       pdata = dev_get_platdata(&pdev->dev);
+       if (!pdata) {
+               dev_err(dev, "no platform data supplied\n");
+               return -EINVAL;
+       }
+
+       if (pdata->probe) {
+               err = pdata->probe(pdata);
+               if (err)
+                       return err;
+       }
+
+       plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
+                           GFP_KERNEL);
+       if (!plcd)
+               return -ENOMEM;
+
+       plcd->us = dev;
+       plcd->pdata = pdata;
+       plcd->lcd = devm_lcd_device_register(&pdev->dev, dev_name(dev), dev,
+                                               plcd, &platform_lcd_ops);
+       if (IS_ERR(plcd->lcd)) {
+               dev_err(dev, "cannot register lcd device\n");
+               return PTR_ERR(plcd->lcd);
+       }
+
+       platform_set_drvdata(pdev, plcd);
+       platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
+
+       return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int platform_lcd_suspend(struct device *dev)
+{
+       struct platform_lcd *plcd = dev_get_drvdata(dev);
+
+       plcd->suspended = 1;
+       platform_lcd_set_power(plcd->lcd, plcd->power);
+
+       return 0;
+}
+
+static int platform_lcd_resume(struct device *dev)
+{
+       struct platform_lcd *plcd = dev_get_drvdata(dev);
+
+       plcd->suspended = 0;
+       platform_lcd_set_power(plcd->lcd, plcd->power);
+
+       return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
+                       platform_lcd_resume);
+
+#ifdef CONFIG_OF
+static const struct of_device_id platform_lcd_of_match[] = {
+       { .compatible = "platform-lcd" },
+       {},
+};
+MODULE_DEVICE_TABLE(of, platform_lcd_of_match);
+#endif
+
+static struct platform_driver platform_lcd_driver = {
+       .driver         = {
+               .name   = "platform-lcd",
+               .pm     = &platform_lcd_pm_ops,
+               .of_match_table = of_match_ptr(platform_lcd_of_match),
+       },
+       .probe          = platform_lcd_probe,
+};
+
+module_platform_driver(platform_lcd_driver);
+
+MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:platform-lcd");