2 * Backlight control code for Sharp Zaurus SL-5500
4 * Copyright 2005 John Lenz <lenz@cs.wisc.edu>
5 * Maintainer: Pavel Machek <pavel@suse.cz> (unless John wants to :-)
8 * This driver assumes single CPU. That's okay, because collie is
9 * slightly old hardware, and noone is going to retrofit second CPU to
13 /* LCD power functions */
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
17 #include <linux/device.h>
18 #include <linux/interrupt.h>
20 #include <linux/backlight.h>
22 #include <asm/hardware/locomo.h>
24 #include <asm/mach/sharpsl_param.h>
25 #include <asm/mach-types.h>
27 #include "../../../arch/arm/mach-sa1100/generic.h"
29 static struct backlight_device *locomolcd_bl_device;
30 static struct locomo_dev *locomolcd_dev;
31 static unsigned long locomolcd_flags;
32 #define LOCOMOLCD_SUSPENDED 0x01
34 static void locomolcd_on(int comadj)
36 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
37 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 1);
40 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
41 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 1);
44 locomo_m62332_senddata(locomolcd_dev, comadj, 0);
47 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
48 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 1);
51 /* TFTCRST | CPSOUT=0 | CPSEN */
52 locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
55 locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
57 /* TFTCRST | CPSOUT=0 | CPSEN */
58 locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
61 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
62 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 1);
65 static void locomolcd_off(int comadj)
67 /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
68 locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
71 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
74 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
77 /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
78 locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);
79 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
80 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
83 void locomolcd_power(int on)
85 int comadj = sharpsl_param.comadj;
88 local_irq_save(flags);
91 local_irq_restore(flags);
96 if (comadj == -1 && machine_is_collie())
98 if (comadj == -1 && machine_is_poodle())
102 locomolcd_on(comadj);
104 locomolcd_off(comadj);
106 local_irq_restore(flags);
108 EXPORT_SYMBOL(locomolcd_power);
111 static int current_intensity;
113 static int locomolcd_set_intensity(struct backlight_device *bd)
115 int intensity = bd->props.brightness;
117 if (bd->props.power != FB_BLANK_UNBLANK)
119 if (bd->props.fb_blank != FB_BLANK_UNBLANK)
121 if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
125 /* AC and non-AC are handled differently, but produce same results in sharp code? */
126 case 0: locomo_frontlight_set(locomolcd_dev, 0, 0, 161); break;
127 case 1: locomo_frontlight_set(locomolcd_dev, 117, 0, 161); break;
128 case 2: locomo_frontlight_set(locomolcd_dev, 163, 0, 148); break;
129 case 3: locomo_frontlight_set(locomolcd_dev, 194, 0, 161); break;
130 case 4: locomo_frontlight_set(locomolcd_dev, 194, 1, 161); break;
135 current_intensity = intensity;
139 static int locomolcd_get_intensity(struct backlight_device *bd)
141 return current_intensity;
144 static struct backlight_ops locomobl_data = {
145 .get_brightness = locomolcd_get_intensity,
146 .update_status = locomolcd_set_intensity,
150 static int locomolcd_suspend(struct locomo_dev *dev, pm_message_t state)
152 locomolcd_flags |= LOCOMOLCD_SUSPENDED;
153 locomolcd_set_intensity(locomolcd_bl_device);
157 static int locomolcd_resume(struct locomo_dev *dev)
159 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
160 locomolcd_set_intensity(locomolcd_bl_device);
164 #define locomolcd_suspend NULL
165 #define locomolcd_resume NULL
168 static int locomolcd_probe(struct locomo_dev *ldev)
172 local_irq_save(flags);
173 locomolcd_dev = ldev;
175 locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
177 /* the poodle_lcd_power function is called for the first time
178 * from fs_initcall, which is before locomo is activated.
179 * We need to recall poodle_lcd_power here*/
180 if (machine_is_poodle())
183 local_irq_restore(flags);
185 locomolcd_bl_device = backlight_device_register("locomo-bl", &ldev->dev, NULL, &locomobl_data);
187 if (IS_ERR (locomolcd_bl_device))
188 return PTR_ERR (locomolcd_bl_device);
190 /* Set up frontlight so that screen is readable */
191 locomolcd_bl_device->props.max_brightness = 4,
192 locomolcd_bl_device->props.brightness = 2;
193 locomolcd_set_intensity(locomolcd_bl_device);
198 static int locomolcd_remove(struct locomo_dev *dev)
202 locomolcd_bl_device->props.brightness = 0;
203 locomolcd_bl_device->props.power = 0;
204 locomolcd_set_intensity(locomolcd_bl_device);
206 backlight_device_unregister(locomolcd_bl_device);
207 local_irq_save(flags);
208 locomolcd_dev = NULL;
209 local_irq_restore(flags);
213 static struct locomo_driver poodle_lcd_driver = {
215 .name = "locomo-backlight",
217 .devid = LOCOMO_DEVID_BACKLIGHT,
218 .probe = locomolcd_probe,
219 .remove = locomolcd_remove,
220 .suspend = locomolcd_suspend,
221 .resume = locomolcd_resume,
225 static int __init locomolcd_init(void)
227 int ret = locomo_driver_register(&poodle_lcd_driver);
231 #ifdef CONFIG_SA1100_COLLIE
232 sa1100fb_lcd_power = locomolcd_power;
237 static void __exit locomolcd_exit(void)
239 locomo_driver_unregister(&poodle_lcd_driver);
242 module_init(locomolcd_init);
243 module_exit(locomolcd_exit);
245 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@suse.cz>");
246 MODULE_DESCRIPTION("Collie LCD driver");
247 MODULE_LICENSE("GPL");