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/config.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/device.h>
19 #include <linux/interrupt.h>
21 #include <linux/backlight.h>
23 #include <asm/hardware/locomo.h>
25 #include <asm/mach/sharpsl_param.h>
26 #include <asm/mach-types.h>
28 #include "../../../arch/arm/mach-sa1100/generic.h"
30 static struct backlight_device *locomolcd_bl_device;
31 static struct locomo_dev *locomolcd_dev;
32 static unsigned long locomolcd_flags;
33 #define LOCOMOLCD_SUSPENDED 0x01
35 static void locomolcd_on(int comadj)
37 locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 0);
38 locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 1);
41 locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0);
42 locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 1);
45 locomo_m62332_senddata(locomolcd_dev, comadj, 0);
48 locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 0);
49 locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 1);
52 /* TFTCRST | CPSOUT=0 | CPSEN */
53 locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
56 locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
58 /* TFTCRST | CPSOUT=0 | CPSEN */
59 locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
62 locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 0);
63 locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 1);
66 static void locomolcd_off(int comadj)
68 /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
69 locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
72 locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 0);
75 locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 0);
78 /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
79 locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);
80 locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 0);
81 locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0);
84 void locomolcd_power(int on)
86 int comadj = sharpsl_param.comadj;
89 local_irq_save(flags);
92 local_irq_restore(flags);
97 if (comadj == -1 && machine_is_collie())
99 if (comadj == -1 && machine_is_poodle())
103 locomolcd_on(comadj);
105 locomolcd_off(comadj);
107 local_irq_restore(flags);
109 EXPORT_SYMBOL(locomolcd_power);
112 static int current_intensity;
114 static int locomolcd_set_intensity(struct backlight_device *bd)
116 int intensity = bd->props->brightness;
118 if (bd->props->power != FB_BLANK_UNBLANK)
120 if (bd->props->fb_blank != FB_BLANK_UNBLANK)
122 if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
126 /* AC and non-AC are handled differently, but produce same results in sharp code? */
127 case 0: locomo_frontlight_set(locomolcd_dev, 0, 0, 161); break;
128 case 1: locomo_frontlight_set(locomolcd_dev, 117, 0, 161); break;
129 case 2: locomo_frontlight_set(locomolcd_dev, 163, 0, 148); break;
130 case 3: locomo_frontlight_set(locomolcd_dev, 194, 0, 161); break;
131 case 4: locomo_frontlight_set(locomolcd_dev, 194, 1, 161); break;
136 current_intensity = intensity;
140 static int locomolcd_get_intensity(struct backlight_device *bd)
142 return current_intensity;
145 static struct backlight_properties locomobl_data = {
146 .owner = THIS_MODULE,
147 .get_brightness = locomolcd_get_intensity,
148 .update_status = locomolcd_set_intensity,
153 static int locomolcd_suspend(struct locomo_dev *dev, pm_message_t state)
155 locomolcd_flags |= LOCOMOLCD_SUSPENDED;
156 locomolcd_set_intensity(locomolcd_bl_device);
160 static int locomolcd_resume(struct locomo_dev *dev)
162 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
163 locomolcd_set_intensity(locomolcd_bl_device);
167 #define locomolcd_suspend NULL
168 #define locomolcd_resume NULL
171 static int locomolcd_probe(struct locomo_dev *dev)
175 local_irq_save(flags);
178 locomo_gpio_set_dir(dev, LOCOMO_GPIO_FL_VR, 0);
180 /* the poodle_lcd_power function is called for the first time
181 * from fs_initcall, which is before locomo is activated.
182 * We need to recall poodle_lcd_power here*/
183 if (machine_is_poodle())
186 local_irq_restore(flags);
188 locomolcd_bl_device = backlight_device_register("locomo-bl", NULL, &locomobl_data);
190 if (IS_ERR (locomolcd_bl_device))
191 return PTR_ERR (locomolcd_bl_device);
193 /* Set up frontlight so that screen is readable */
194 locomobl_data.brightness = 2;
195 locomolcd_set_intensity(locomolcd_bl_device);
200 static int locomolcd_remove(struct locomo_dev *dev)
204 backlight_device_unregister(locomolcd_bl_device);
205 local_irq_save(flags);
206 locomolcd_dev = NULL;
207 local_irq_restore(flags);
211 static struct locomo_driver poodle_lcd_driver = {
213 .name = "locomo-backlight",
215 .devid = LOCOMO_DEVID_BACKLIGHT,
216 .probe = locomolcd_probe,
217 .remove = locomolcd_remove,
218 .suspend = locomolcd_suspend,
219 .resume = locomolcd_resume,
223 static int __init locomolcd_init(void)
225 int ret = locomo_driver_register(&poodle_lcd_driver);
229 #ifdef CONFIG_SA1100_COLLIE
230 sa1100fb_lcd_power = locomolcd_power;
235 static void __exit locomolcd_exit(void)
237 locomo_driver_unregister(&poodle_lcd_driver);
240 module_init(locomolcd_init);
241 module_exit(locomolcd_exit);
243 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@suse.cz>");
244 MODULE_DESCRIPTION("Collie LCD driver");
245 MODULE_LICENSE("GPL");