diff options
Diffstat (limited to 'drivers/video/backlight/jornada720_lcd.c')
| -rw-r--r-- | drivers/video/backlight/jornada720_lcd.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/video/backlight/jornada720_lcd.c b/drivers/video/backlight/jornada720_lcd.c new file mode 100644 index 00000000000000..ab9cbe16db41a0 --- /dev/null +++ b/drivers/video/backlight/jornada720_lcd.c @@ -0,0 +1,152 @@ +/* + * drivers/video/backlight/jornada720_lcd.c + * + * LCD display driver for HP Jornada 720 + * + * Copyright (c) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/lcd.h> +#include <linux/fb.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <asm/hardware.h> +#include <asm/arch/jornada720_mcu.h> +#include <video/s1d13xxxfb.h> + +MODULE_AUTHOR("Filip Zyzniewski <filip.zyzniewski@tefnet.pl>"); +MODULE_DESCRIPTION("HP Jornada 720 LCD control"); +MODULE_LICENSE("GPL"); + +/* + * HP Documentation referred in this file: + * http://www.jlime.com/downloads/development/docs/jornada7xx/jornada720.txt + */ + +#define JORNADA720_LCD_MAX_CONTRAST 0xff + +/* default contrast (line 457 of HP's doc, but it looks bad with that one) */ +#define JORNADA720_LCD_DEFAULT_CONTRAST 0x80 + +static struct lcd_device *jornada720_lcd_device; + +static int jornada720_lcd_set_contrast(struct lcd_device *dev, int contrast) +{ + int ret=0; + + /* line 312 of HP's doc */ + if ( !(ret=jornada720_mcu_start(jornada720_mcu_SetContrast)) ) { + if(jornada720_mcu_byte(contrast) != jornada720_mcu_TxDummy) + ret = -1; + } else + printk(KERN_WARNING "jornada720_lcd: SetContrast failed\n"); + + jornada720_mcu_end(); + + return ret; +} + +static int jornada720_lcd_get_power(struct lcd_device *dev) { + /* LDD2 in PPC is responsible for LCD power (line 458 of HP's doc */ + if(PPSR & PPC_LDD2) + return FB_BLANK_UNBLANK; + else + return FB_BLANK_POWERDOWN; +} + +static int jornada720_lcd_set_power(struct lcd_device *dev, int power) { + if (power != FB_BLANK_UNBLANK) { + /* turn off the LCD (line 458 of HP's doc) */ + PPSR &= ~PPC_LDD2; + PPDR |= PPC_LDD2; + } else + /* turn on the LCD (line 458 of HP's doc) */ + PPSR |= PPC_LDD2; + return 0; +} + +static int jornada720_lcd_get_contrast(struct lcd_device *dev) +{ + int ret; + + /* check if LCD is on (line 458 of HP's doc */ + if(jornada720_lcd_get_power(dev) != FB_BLANK_UNBLANK) + return 0; + + /* get the data from MCU (line 312 of HP's doc) */ + if(jornada720_mcu_start(jornada720_mcu_GetContrast)) { + printk(KERN_WARNING "jornada720_lcd: GetContrast failed\n"); + ret=256; + } else + ret=jornada720_mcu_read(); + + jornada720_mcu_end(); + + return ret; +} + +static struct lcd_properties jornada720_lcd_data = { + .owner = THIS_MODULE, + .max_contrast = JORNADA720_LCD_MAX_CONTRAST, + .get_contrast = jornada720_lcd_get_contrast, + .set_contrast = jornada720_lcd_set_contrast, + .get_power = jornada720_lcd_get_power, + .set_power = jornada720_lcd_set_power, +}; + +static int jornada720_lcd_probe(struct device *_dev) +{ + /* + * name must match fb driver name (documentation of + * lcd_device_register() in lcd.c + */ + jornada720_lcd_device = lcd_device_register (S1D_DEVICENAME, + NULL, &jornada720_lcd_data); + if (IS_ERR (jornada720_lcd_device)) + return PTR_ERR (jornada720_lcd_device); + + /* line 457 of HP's doc */ + jornada720_lcd_set_contrast(jornada720_lcd_device, JORNADA720_LCD_DEFAULT_CONTRAST); + /* line 458 of HP's doc */ + jornada720_lcd_set_power(jornada720_lcd_device, FB_BLANK_UNBLANK); + /* line 459 of HP's doc */ + msleep(100); + + return 0; + +} + +static int jornada720_lcd_remove(struct device *_dev) +{ + lcd_device_unregister(jornada720_lcd_device); + return 0; +} + +static struct device_driver jornada720_lcd_driver = { + .name = jornada720_mcu_bus_id_lcd, + .bus = &jornada720_mcu_bus_type, + .probe = jornada720_lcd_probe, + .remove = jornada720_lcd_remove, + .owner = THIS_MODULE +}; + +static int __init jornada720_lcd_init(void) +{ + return driver_register(&jornada720_lcd_driver); +} + +static void __exit jornada720_lcd_exit(void) +{ + driver_unregister(&jornada720_lcd_driver); +} + +module_init(jornada720_lcd_init); +module_exit(jornada720_lcd_exit); |