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987132bb PM |
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@suse.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 noone is going to retrofit second CPU to | |
10 | * old PDA. | |
11 | */ | |
12 | ||
13 | /* LCD power functions */ | |
987132bb PM |
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> | |
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19 | #include <linux/fb.h> |
20 | #include <linux/backlight.h> | |
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21 | |
22 | #include <asm/hardware/locomo.h> | |
23 | #include <asm/irq.h> | |
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24 | #include <asm/mach/sharpsl_param.h> |
25 | #include <asm/mach-types.h> | |
987132bb | 26 | |
36a95bf5 | 27 | #include "../../../arch/arm/mach-sa1100/generic.h" |
987132bb | 28 | |
e4423781 | 29 | static struct backlight_device *locomolcd_bl_device; |
987132bb | 30 | static struct locomo_dev *locomolcd_dev; |
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31 | static unsigned long locomolcd_flags; |
32 | #define LOCOMOLCD_SUSPENDED 0x01 | |
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33 | |
34 | static void locomolcd_on(int comadj) | |
35 | { | |
36 | locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 0); | |
37 | locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 1); | |
38 | mdelay(2); | |
39 | ||
40 | locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0); | |
41 | locomo_gpio_write(locomolcd_dev, 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, LOCOMO_GPIO_LCD_VEE_ON, 0); | |
48 | locomo_gpio_write(locomolcd_dev, 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, LOCOMO_GPIO_LCD_MOD, 0); | |
62 | locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 1); | |
63 | } | |
64 | ||
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, LOCOMO_GPIO_LCD_VSHA_ON, 0); | |
72 | mdelay(110); | |
73 | ||
74 | locomo_gpio_write(locomolcd_dev, 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, LOCOMO_GPIO_LCD_MOD, 0); | |
80 | locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0); | |
81 | } | |
82 | ||
83 | void locomolcd_power(int on) | |
84 | { | |
36a95bf5 | 85 | int comadj = sharpsl_param.comadj; |
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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 */ | |
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96 | if (comadj == -1 && machine_is_collie()) |
97 | comadj = 128; | |
98 | if (comadj == -1 && machine_is_poodle()) | |
99 | comadj = 118; | |
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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 | ||
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110 | |
111 | static int current_intensity; | |
112 | ||
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 | ||
139 | static int locomolcd_get_intensity(struct backlight_device *bd) | |
140 | { | |
141 | return current_intensity; | |
142 | } | |
143 | ||
144 | static struct backlight_properties locomobl_data = { | |
145 | .owner = THIS_MODULE, | |
146 | .get_brightness = locomolcd_get_intensity, | |
147 | .update_status = locomolcd_set_intensity, | |
148 | .max_brightness = 4, | |
149 | }; | |
150 | ||
151 | #ifdef CONFIG_PM | |
152 | static int locomolcd_suspend(struct locomo_dev *dev, pm_message_t state) | |
153 | { | |
154 | locomolcd_flags |= LOCOMOLCD_SUSPENDED; | |
155 | locomolcd_set_intensity(locomolcd_bl_device); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | static int locomolcd_resume(struct locomo_dev *dev) | |
160 | { | |
161 | locomolcd_flags &= ~LOCOMOLCD_SUSPENDED; | |
162 | locomolcd_set_intensity(locomolcd_bl_device); | |
163 | return 0; | |
164 | } | |
165 | #else | |
166 | #define locomolcd_suspend NULL | |
167 | #define locomolcd_resume NULL | |
168 | #endif | |
169 | ||
170 | static int locomolcd_probe(struct locomo_dev *dev) | |
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171 | { |
172 | unsigned long flags; | |
173 | ||
174 | local_irq_save(flags); | |
175 | locomolcd_dev = dev; | |
176 | ||
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177 | locomo_gpio_set_dir(dev, LOCOMO_GPIO_FL_VR, 0); |
178 | ||
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179 | /* the poodle_lcd_power function is called for the first time |
180 | * from fs_initcall, which is before locomo is activated. | |
181 | * We need to recall poodle_lcd_power here*/ | |
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182 | if (machine_is_poodle()) |
183 | locomolcd_power(1); | |
184 | ||
987132bb | 185 | local_irq_restore(flags); |
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186 | |
187 | locomolcd_bl_device = backlight_device_register("locomo-bl", NULL, &locomobl_data); | |
188 | ||
189 | if (IS_ERR (locomolcd_bl_device)) | |
190 | return PTR_ERR (locomolcd_bl_device); | |
191 | ||
192 | /* Set up frontlight so that screen is readable */ | |
193 | locomobl_data.brightness = 2; | |
194 | locomolcd_set_intensity(locomolcd_bl_device); | |
195 | ||
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196 | return 0; |
197 | } | |
198 | ||
e4423781 | 199 | static int locomolcd_remove(struct locomo_dev *dev) |
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200 | { |
201 | unsigned long flags; | |
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202 | |
203 | backlight_device_unregister(locomolcd_bl_device); | |
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204 | local_irq_save(flags); |
205 | locomolcd_dev = NULL; | |
206 | local_irq_restore(flags); | |
207 | return 0; | |
208 | } | |
209 | ||
210 | static struct locomo_driver poodle_lcd_driver = { | |
211 | .drv = { | |
212 | .name = "locomo-backlight", | |
213 | }, | |
214 | .devid = LOCOMO_DEVID_BACKLIGHT, | |
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215 | .probe = locomolcd_probe, |
216 | .remove = locomolcd_remove, | |
217 | .suspend = locomolcd_suspend, | |
218 | .resume = locomolcd_resume, | |
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219 | }; |
220 | ||
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221 | |
222 | static int __init locomolcd_init(void) | |
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223 | { |
224 | int ret = locomo_driver_register(&poodle_lcd_driver); | |
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225 | if (ret) |
226 | return ret; | |
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227 | |
228 | #ifdef CONFIG_SA1100_COLLIE | |
229 | sa1100fb_lcd_power = locomolcd_power; | |
230 | #endif | |
231 | return 0; | |
232 | } | |
987132bb | 233 | |
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234 | static void __exit locomolcd_exit(void) |
235 | { | |
236 | locomo_driver_unregister(&poodle_lcd_driver); | |
237 | } | |
238 | ||
239 | module_init(locomolcd_init); | |
240 | module_exit(locomolcd_exit); | |
241 | ||
242 | MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@suse.cz>"); | |
243 | MODULE_DESCRIPTION("Collie LCD driver"); | |
244 | MODULE_LICENSE("GPL"); |