From 9e124435c772c650457a952b27bcbdb9a95d48d0 Mon Sep 17 00:00:00 2001
From: Kristoffer Ericson <kristoffer.ericson@gmail.com>
Date: Wed, 18 Feb 2009 11:47:26 +0000
Subject: [PATCH] backlight: Add HP Jornada 700 series LCD driver

Signed-off-by: Kristoffer Ericson <kristoffer.ericson@gmail.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
---
 drivers/video/backlight/Kconfig          |   9 ++
 drivers/video/backlight/Makefile         |   1 +
 drivers/video/backlight/jornada720_lcd.c | 153 +++++++++++++++++++++++
 3 files changed, 163 insertions(+)
 create mode 100644 drivers/video/backlight/jornada720_lcd.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 72facb9eb7db76..1064f69e1e871b 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -84,6 +84,15 @@ config LCD_TOSA
 	  If you have an Sharp SL-6000 Zaurus say Y to enable a driver
 	  for its LCD.
 
+config LCD_HP700
+	tristate "HP Jornada 700 series LCD Driver"
+	depends on LCD_CLASS_DEVICE
+	depends on SA1100_JORNADA720_SSP && !PREEMPT
+	default y
+	help
+	  If you have an HP Jornada 700 series handheld (710/720/728)
+	  say Y to enable LCD control driver.
+
 #
 # Backlight
 #
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 63d75949816544..c508075157b2cb 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -2,6 +2,7 @@
 
 obj-$(CONFIG_LCD_CLASS_DEVICE)     += lcd.o
 obj-$(CONFIG_LCD_CORGI)		   += corgi_lcd.o
+obj-$(CONFIG_LCD_HP700)		   += jornada720_lcd.o
 obj-$(CONFIG_LCD_LTV350QV)	   += ltv350qv.o
 obj-$(CONFIG_LCD_ILI9320)	   += ili9320.o
 obj-$(CONFIG_LCD_PLATFORM)	   += platform_lcd.o
diff --git a/drivers/video/backlight/jornada720_lcd.c b/drivers/video/backlight/jornada720_lcd.c
new file mode 100644
index 00000000000000..cbbb167fd268fd
--- /dev/null
+++ b/drivers/video/backlight/jornada720_lcd.c
@@ -0,0 +1,153 @@
+/*
+ *
+ * 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 *dev)
+{
+	/* LDD2 in PPC = LCD POWER */
+	if (PPSR & PPC_LDD2)
+		return FB_BLANK_UNBLANK;	/* PW ON */
+	else
+		return FB_BLANK_POWERDOWN;	/* PW OFF */
+}
+
+static int jornada_lcd_get_contrast(struct lcd_device *dev)
+{
+	int ret;
+
+	if (jornada_lcd_get_power(dev) != FB_BLANK_UNBLANK)
+		return 0;
+
+	jornada_ssp_start();
+
+	if (jornada_ssp_byte(GETCONTRAST) != TXDUMMY) {
+		printk(KERN_ERR "lcd: get contrast failed\n");
+		jornada_ssp_end();
+		return -ETIMEDOUT;
+	} else {
+		ret = jornada_ssp_byte(TXDUMMY);
+		jornada_ssp_end();
+		return ret;
+	}
+}
+
+static int jornada_lcd_set_contrast(struct lcd_device *dev, int value)
+{
+	int ret;
+
+	jornada_ssp_start();
+
+	/* start by sending our set contrast cmd to mcu */
+	ret = jornada_ssp_byte(SETCONTRAST);
+
+	/* push the new value */
+	if (jornada_ssp_byte(value) != TXDUMMY) {
+		printk(KERN_ERR "lcd : set contrast failed\n");
+		jornada_ssp_end();
+		return -ETIMEDOUT;
+	}
+
+	/* if we get here we can assume everything went well */
+	jornada_ssp_end();
+
+	return 0;
+}
+
+static int jornada_lcd_set_power(struct lcd_device *dev, 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 = lcd_device_register(S1D_DEVICENAME, &pdev->dev, NULL, &jornada_lcd_props);
+
+	if (IS_ERR(lcd_device)) {
+		ret = PTR_ERR(lcd_device);
+		printk(KERN_ERR "lcd : 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 int jornada_lcd_remove(struct platform_device *pdev)
+{
+	struct lcd_device *lcd_device = platform_get_drvdata(pdev);
+
+	lcd_device_unregister(lcd_device);
+
+	return 0;
+}
+
+static struct platform_driver jornada_lcd_driver = {
+	.probe	= jornada_lcd_probe,
+	.remove	= jornada_lcd_remove,
+	.driver	= {
+		.name	= "jornada_lcd",
+	},
+};
+
+int __init jornada_lcd_init(void)
+{
+	return platform_driver_register(&jornada_lcd_driver);
+}
+
+void __exit jornada_lcd_exit(void)
+{
+	platform_driver_unregister(&jornada_lcd_driver);
+}
+
+MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
+MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
+MODULE_LICENSE("GPL");
+
+module_init(jornada_lcd_init);
+module_exit(jornada_lcd_exit);