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>

3 files changed, 163 insertions, 0 deletions

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 72facb9eb7db..1064f69e1e87 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 63d759498165..c508075157b2 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 000000000000..cbbb167fd268
--- /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);