1 /*
2 * Backlight control code for Sharp Zaurus SL-5500
3 *
4 * Copyright 2005 John Lenz <lenz@cs.wisc.edu>
5 * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)
6 * GPL v2
7 *
8 * This driver assumes single CPU. That's okay, because collie is
9 * slightly old hardware, and no one is going to retrofit second CPU to
10 * old PDA.
11 */
12
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>
19 #include <linux/fb.h>
20 #include <linux/backlight.h>
21
22 #include <asm/hardware/locomo.h>
23 #include <asm/irq.h>
24 #include <asm/mach/sharpsl_param.h>
25 #include <asm/mach-types.h>
26
27 #include "../../../arch/arm/mach-sa1100/generic.h"
28
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
33
locomolcd_on(int comadj)34 static void locomolcd_on(int comadj)
35 {
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);
38 mdelay(2);
39
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);
42 mdelay(2);
43
44 locomo_m62332_senddata(locomolcd_dev, comadj, 0);
45 mdelay(5);
46
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);
49 mdelay(10);
50
51 /* TFTCRST | CPSOUT=0 | CPSEN */
52 locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
53
54 /* Set CPSD */
55 locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
56
57 /* TFTCRST | CPSOUT=0 | CPSEN */
58 locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
59 mdelay(10);
60
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);
63 }
64
locomolcd_off(int comadj)65 static void locomolcd_off(int comadj)
66 {
67 /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
68 locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
69 mdelay(1);
70
71 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
72 mdelay(110);
73
74 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
75 mdelay(700);
76
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);
81 }
82
locomolcd_power(int on)83 void locomolcd_power(int on)
84 {
85 int comadj = sharpsl_param.comadj;
86 unsigned long flags;
87
88 local_irq_save(flags);
89
90 if (!locomolcd_dev) {
91 local_irq_restore(flags);
92 return;
93 }
94
95 /* read comadj */
96 if (comadj == -1 && machine_is_collie())
97 comadj = 128;
98 if (comadj == -1 && machine_is_poodle())
99 comadj = 118;
100
101 if (on)
102 locomolcd_on(comadj);
103 else
104 locomolcd_off(comadj);
105
106 local_irq_restore(flags);
107 }
108 EXPORT_SYMBOL(locomolcd_power);
109
110
111 static int current_intensity;
112
locomolcd_set_intensity(struct backlight_device * bd)113 static int locomolcd_set_intensity(struct backlight_device *bd)
114 {
115 int intensity = bd->props.brightness;
116
117 if (bd->props.power != FB_BLANK_UNBLANK)
118 intensity = 0;
119 if (bd->props.fb_blank != FB_BLANK_UNBLANK)
120 intensity = 0;
121 if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
122 intensity = 0;
123
124 switch (intensity) {
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;
131
132 default:
133 return -ENODEV;
134 }
135 current_intensity = intensity;
136 return 0;
137 }
138
locomolcd_get_intensity(struct backlight_device * bd)139 static int locomolcd_get_intensity(struct backlight_device *bd)
140 {
141 return current_intensity;
142 }
143
144 static const struct backlight_ops locomobl_data = {
145 .get_brightness = locomolcd_get_intensity,
146 .update_status = locomolcd_set_intensity,
147 };
148
149 #ifdef CONFIG_PM
locomolcd_suspend(struct locomo_dev * dev,pm_message_t state)150 static int locomolcd_suspend(struct locomo_dev *dev, pm_message_t state)
151 {
152 locomolcd_flags |= LOCOMOLCD_SUSPENDED;
153 locomolcd_set_intensity(locomolcd_bl_device);
154 return 0;
155 }
156
locomolcd_resume(struct locomo_dev * dev)157 static int locomolcd_resume(struct locomo_dev *dev)
158 {
159 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
160 locomolcd_set_intensity(locomolcd_bl_device);
161 return 0;
162 }
163 #else
164 #define locomolcd_suspend NULL
165 #define locomolcd_resume NULL
166 #endif
167
locomolcd_probe(struct locomo_dev * ldev)168 static int locomolcd_probe(struct locomo_dev *ldev)
169 {
170 struct backlight_properties props;
171 unsigned long flags;
172
173 local_irq_save(flags);
174 locomolcd_dev = ldev;
175
176 locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
177
178 /* the poodle_lcd_power function is called for the first time
179 * from fs_initcall, which is before locomo is activated.
180 * We need to recall poodle_lcd_power here*/
181 if (machine_is_poodle())
182 locomolcd_power(1);
183
184 local_irq_restore(flags);
185
186 memset(&props, 0, sizeof(struct backlight_properties));
187 props.type = BACKLIGHT_RAW;
188 props.max_brightness = 4;
189 locomolcd_bl_device = backlight_device_register("locomo-bl",
190 &ldev->dev, NULL,
191 &locomobl_data, &props);
192
193 if (IS_ERR (locomolcd_bl_device))
194 return PTR_ERR (locomolcd_bl_device);
195
196 /* Set up frontlight so that screen is readable */
197 locomolcd_bl_device->props.brightness = 2;
198 locomolcd_set_intensity(locomolcd_bl_device);
199
200 return 0;
201 }
202
locomolcd_remove(struct locomo_dev * dev)203 static int locomolcd_remove(struct locomo_dev *dev)
204 {
205 unsigned long flags;
206
207 locomolcd_bl_device->props.brightness = 0;
208 locomolcd_bl_device->props.power = 0;
209 locomolcd_set_intensity(locomolcd_bl_device);
210
211 backlight_device_unregister(locomolcd_bl_device);
212 local_irq_save(flags);
213 locomolcd_dev = NULL;
214 local_irq_restore(flags);
215 return 0;
216 }
217
218 static struct locomo_driver poodle_lcd_driver = {
219 .drv = {
220 .name = "locomo-backlight",
221 },
222 .devid = LOCOMO_DEVID_BACKLIGHT,
223 .probe = locomolcd_probe,
224 .remove = locomolcd_remove,
225 .suspend = locomolcd_suspend,
226 .resume = locomolcd_resume,
227 };
228
229
locomolcd_init(void)230 static int __init locomolcd_init(void)
231 {
232 return locomo_driver_register(&poodle_lcd_driver);
233 }
234
locomolcd_exit(void)235 static void __exit locomolcd_exit(void)
236 {
237 locomo_driver_unregister(&poodle_lcd_driver);
238 }
239
240 module_init(locomolcd_init);
241 module_exit(locomolcd_exit);
242
243 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
244 MODULE_DESCRIPTION("Collie LCD driver");
245 MODULE_LICENSE("GPL");
246