diff options
Diffstat (limited to 'drivers/video/backlight/jornada720_lcd.c')
| -rw-r--r-- | drivers/video/backlight/jornada720_lcd.c | 153 |
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); |