Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / video / backlight / jornada720_lcd.c

diff --git a/kernel/drivers/video/backlight/jornada720_lcd.c b/kernel/drivers/video/backlight/jornada720_lcd.c
new file mode 100644 (file)
index 0000000..dfa0fa0
--- /dev/null
+++ b/kernel/drivers/video/backlight/jornada720_lcd.c
@@ -0,0 +1,131 @@
+/*
+ *
+ * LCD driver for HP Jornada 700 series (710/720/728)
+ * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 or any later version as published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/fb.h>
+#include <linux/kernel.h>
+#include <linux/lcd.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+
+#include <mach/jornada720.h>
+#include <mach/hardware.h>
+
+#include <video/s1d13xxxfb.h>
+
+#define LCD_MAX_CONTRAST       0xff
+#define LCD_DEF_CONTRAST       0x80
+
+static int jornada_lcd_get_power(struct lcd_device *ld)
+{
+       return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
+}
+
+static int jornada_lcd_get_contrast(struct lcd_device *ld)
+{
+       int ret;
+
+       if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
+               return 0;
+
+       jornada_ssp_start();
+
+       if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
+               ret = jornada_ssp_byte(TXDUMMY);
+               goto success;
+       }
+
+       dev_err(&ld->dev, "failed to set contrast\n");
+       ret = -ETIMEDOUT;
+
+success:
+       jornada_ssp_end();
+       return ret;
+}
+
+static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
+{
+       int ret = 0;
+
+       jornada_ssp_start();
+
+       /* start by sending our set contrast cmd to mcu */
+       if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
+               /* if successful push the new value */
+               if (jornada_ssp_byte(value) == TXDUMMY)
+                       goto success;
+       }
+
+       dev_err(&ld->dev, "failed to set contrast\n");
+       ret = -ETIMEDOUT;
+
+success:
+       jornada_ssp_end();
+       return ret;
+}
+
+static int jornada_lcd_set_power(struct lcd_device *ld, int power)
+{
+       if (power != FB_BLANK_UNBLANK) {
+               PPSR &= ~PPC_LDD2;
+               PPDR |= PPC_LDD2;
+       } else {
+               PPSR |= PPC_LDD2;
+       }
+
+       return 0;
+}
+
+static struct lcd_ops jornada_lcd_props = {
+       .get_contrast = jornada_lcd_get_contrast,
+       .set_contrast = jornada_lcd_set_contrast,
+       .get_power = jornada_lcd_get_power,
+       .set_power = jornada_lcd_set_power,
+};
+
+static int jornada_lcd_probe(struct platform_device *pdev)
+{
+       struct lcd_device *lcd_device;
+       int ret;
+
+       lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
+                                       &pdev->dev, NULL, &jornada_lcd_props);
+
+       if (IS_ERR(lcd_device)) {
+               ret = PTR_ERR(lcd_device);
+               dev_err(&pdev->dev, "failed to register device\n");
+               return ret;
+       }
+
+       platform_set_drvdata(pdev, lcd_device);
+
+       /* lets set our default values */
+       jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
+       jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
+       /* give it some time to startup */
+       msleep(100);
+
+       return 0;
+}
+
+static struct platform_driver jornada_lcd_driver = {
+       .probe  = jornada_lcd_probe,
+       .driver = {
+               .name   = "jornada_lcd",
+       },
+};
+
+module_platform_driver(jornada_lcd_driver);
+
+MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
+MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
+MODULE_LICENSE("GPL");