/* * Backlight control code for Sharp Zaurus SL-5500 * * Copyright 2005 John Lenz <lenz@cs.wisc.edu> * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-) * GPL v2 * * This driver assumes single CPU. That's okay, because collie is * slightly old hardware, and no one is going to retrofit second CPU to * old PDA. */ /* LCD power functions */ #include <linux/module.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/fb.h> #include <linux/backlight.h> #include <asm/hardware/locomo.h> #include <asm/irq.h> #include <asm/mach/sharpsl_param.h> #include <asm/mach-types.h> #include "../../../arch/arm/mach-sa1100/generic.h" static struct backlight_device *locomolcd_bl_device; static struct locomo_dev *locomolcd_dev; static unsigned long locomolcd_flags; #define LOCOMOLCD_SUSPENDED 0x01 static void locomolcd_on(int comadj) { locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0); locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 1); mdelay(2); locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0); locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 1); mdelay(2); locomo_m62332_senddata(locomolcd_dev, comadj, 0); mdelay(5); locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0); locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 1); mdelay(10); /* TFTCRST | CPSOUT=0 | CPSEN */ locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC); /* Set CPSD */ locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD); /* TFTCRST | CPSOUT=0 | CPSEN */ locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC); mdelay(10); locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0); locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 1); } static void locomolcd_off(int comadj) { /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */ locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC); mdelay(1); locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0); mdelay(110); locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0); mdelay(700); /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */ locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC); locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0); locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0); } void locomolcd_power(int on) { int comadj = sharpsl_param.comadj; unsigned long flags; local_irq_save(flags); if (!locomolcd_dev) { local_irq_restore(flags); return; } /* read comadj */ if (comadj == -1 && machine_is_collie()) comadj = 128; if (comadj == -1 && machine_is_poodle()) comadj = 118; if (on) locomolcd_on(comadj); else locomolcd_off(comadj); local_irq_restore(flags); } EXPORT_SYMBOL(locomolcd_power); static int current_intensity; static int locomolcd_set_intensity(struct backlight_device *bd) { int intensity = bd->props.brightness; if (bd->props.power != FB_BLANK_UNBLANK) intensity = 0; if (bd->props.fb_blank != FB_BLANK_UNBLANK) intensity = 0; if (locomolcd_flags & LOCOMOLCD_SUSPENDED) intensity = 0; switch (intensity) { /* AC and non-AC are handled differently, but produce same results in sharp code? */ case 0: locomo_frontlight_set(locomolcd_dev, 0, 0, 161); break; case 1: locomo_frontlight_set(locomolcd_dev, 117, 0, 161); break; case 2: locomo_frontlight_set(locomolcd_dev, 163, 0, 148); break; case 3: locomo_frontlight_set(locomolcd_dev, 194, 0, 161); break; case 4: locomo_frontlight_set(locomolcd_dev, 194, 1, 161); break; default: return -ENODEV; } current_intensity = intensity; return 0; } static int locomolcd_get_intensity(struct backlight_device *bd) { return current_intensity; } static const struct backlight_ops locomobl_data = { .get_brightness = locomolcd_get_intensity, .update_status = locomolcd_set_intensity, }; #ifdef CONFIG_PM static int locomolcd_suspend(struct locomo_dev *dev, pm_message_t state) { locomolcd_flags |= LOCOMOLCD_SUSPENDED; locomolcd_set_intensity(locomolcd_bl_device); return 0; } static int locomolcd_resume(struct locomo_dev *dev) { locomolcd_flags &= ~LOCOMOLCD_SUSPENDED; locomolcd_set_intensity(locomolcd_bl_device); return 0; } #else #define locomolcd_suspend NULL #define locomolcd_resume NULL #endif static int locomolcd_probe(struct locomo_dev *ldev) { struct backlight_properties props; unsigned long flags; local_irq_save(flags); locomolcd_dev = ldev; locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0); /* the poodle_lcd_power function is called for the first time * from fs_initcall, which is before locomo is activated. * We need to recall poodle_lcd_power here*/ if (machine_is_poodle()) locomolcd_power(1); local_irq_restore(flags); memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_RAW; props.max_brightness = 4; locomolcd_bl_device = backlight_device_register("locomo-bl", &ldev->dev, NULL, &locomobl_data, &props); if (IS_ERR (locomolcd_bl_device)) return PTR_ERR (locomolcd_bl_device); /* Set up frontlight so that screen is readable */ locomolcd_bl_device->props.brightness = 2; locomolcd_set_intensity(locomolcd_bl_device); return 0; } static int locomolcd_remove(struct locomo_dev *dev) { unsigned long flags; locomolcd_bl_device->props.brightness = 0; locomolcd_bl_device->props.power = 0; locomolcd_set_intensity(locomolcd_bl_device); backlight_device_unregister(locomolcd_bl_device); local_irq_save(flags); locomolcd_dev = NULL; local_irq_restore(flags); return 0; } static struct locomo_driver poodle_lcd_driver = { .drv = { .name = "locomo-backlight", }, .devid = LOCOMO_DEVID_BACKLIGHT, .probe = locomolcd_probe, .remove = locomolcd_remove, .suspend = locomolcd_suspend, .resume = locomolcd_resume, }; static int __init locomolcd_init(void) { int ret = locomo_driver_register(&poodle_lcd_driver); if (ret) return ret; #ifdef CONFIG_SA1100_COLLIE sa1100fb_lcd_power = locomolcd_power; #endif return 0; } static void __exit locomolcd_exit(void) { locomo_driver_unregister(&poodle_lcd_driver); } module_init(locomolcd_init); module_exit(locomolcd_exit); MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>"); MODULE_DESCRIPTION("Collie LCD driver"); MODULE_LICENSE("GPL");