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authorKristoffer Ericson <kristoffer.ericson@gmail.com>2009-02-18 11:47:26 +0000
committerRichard Purdie <rpurdie@linux.intel.com>2009-04-06 16:06:55 +0100
commit9e124435c772c650457a952b27bcbdb9a95d48d0 (patch)
tree27897fbfb8938e8f34385ec4155b1ba0800de1b0 /drivers/video/backlight/jornada720_lcd.c
parentb8cdd877f2cbcc07b5a287b7273a8eaa4c11ad04 (diff)
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>
Diffstat (limited to 'drivers/video/backlight/jornada720_lcd.c')
-rw-r--r--drivers/video/backlight/jornada720_lcd.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/drivers/video/backlight/jornada720_lcd.c b/drivers/video/backlight/jornada720_lcd.c
new file mode 100644
index 00000000000..cbbb167fd26
--- /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);