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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> | |
a2531293 | 5 | * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-) |
987132bb PM |
6 | * GPL v2 |
7 | * | |
8 | * This driver assumes single CPU. That's okay, because collie is | |
25985edc | 9 | * slightly old hardware, and no one is going to retrofit second CPU to |
987132bb PM |
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> | |
e4423781 RP |
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> | |
36a95bf5 PM |
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; |
e4423781 RP |
31 | static unsigned long locomolcd_flags; |
32 | #define LOCOMOLCD_SUSPENDED 0x01 | |
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33 | |
34 | static void locomolcd_on(int comadj) | |
35 | { | |
8d48427e RP |
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); | |
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38 | mdelay(2); |
39 | ||
8d48427e RP |
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); | |
987132bb PM |
42 | mdelay(2); |
43 | ||
44 | locomo_m62332_senddata(locomolcd_dev, comadj, 0); | |
45 | mdelay(5); | |
46 | ||
8d48427e RP |
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); | |
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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 | ||
8d48427e RP |
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); | |
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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 | ||
8d48427e | 71 | locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0); |
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72 | mdelay(110); |
73 | ||
8d48427e | 74 | locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0); |
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75 | mdelay(700); |
76 | ||
77 | /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */ | |
78 | locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC); | |
8d48427e RP |
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); | |
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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 */ | |
e4423781 RP |
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 | ||
e4423781 RP |
110 | static int current_intensity; |
111 | ||
112 | static int locomolcd_set_intensity(struct backlight_device *bd) | |
113 | { | |
599a52d1 | 114 | int intensity = bd->props.brightness; |
e4423781 | 115 | |
599a52d1 | 116 | if (bd->props.power != FB_BLANK_UNBLANK) |
e4423781 | 117 | intensity = 0; |
599a52d1 | 118 | if (bd->props.fb_blank != FB_BLANK_UNBLANK) |
e4423781 RP |
119 | intensity = 0; |
120 | if (locomolcd_flags & LOCOMOLCD_SUSPENDED) | |
121 | intensity = 0; | |
122 | ||
123 | switch (intensity) { | |
9f67675a JH |
124 | /* |
125 | * AC and non-AC are handled differently, | |
126 | * but produce same results in sharp code? | |
127 | */ | |
128 | case 0: | |
129 | locomo_frontlight_set(locomolcd_dev, 0, 0, 161); | |
130 | break; | |
131 | case 1: | |
132 | locomo_frontlight_set(locomolcd_dev, 117, 0, 161); | |
133 | break; | |
134 | case 2: | |
135 | locomo_frontlight_set(locomolcd_dev, 163, 0, 148); | |
136 | break; | |
137 | case 3: | |
138 | locomo_frontlight_set(locomolcd_dev, 194, 0, 161); | |
139 | break; | |
140 | case 4: | |
141 | locomo_frontlight_set(locomolcd_dev, 194, 1, 161); | |
142 | break; | |
e4423781 RP |
143 | default: |
144 | return -ENODEV; | |
145 | } | |
146 | current_intensity = intensity; | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static int locomolcd_get_intensity(struct backlight_device *bd) | |
151 | { | |
152 | return current_intensity; | |
153 | } | |
154 | ||
9905a43b | 155 | static const struct backlight_ops locomobl_data = { |
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156 | .get_brightness = locomolcd_get_intensity, |
157 | .update_status = locomolcd_set_intensity, | |
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158 | }; |
159 | ||
5a3778e2 JH |
160 | #ifdef CONFIG_PM_SLEEP |
161 | static int locomolcd_suspend(struct device *dev) | |
e4423781 RP |
162 | { |
163 | locomolcd_flags |= LOCOMOLCD_SUSPENDED; | |
164 | locomolcd_set_intensity(locomolcd_bl_device); | |
165 | return 0; | |
166 | } | |
167 | ||
5a3778e2 | 168 | static int locomolcd_resume(struct device *dev) |
e4423781 RP |
169 | { |
170 | locomolcd_flags &= ~LOCOMOLCD_SUSPENDED; | |
171 | locomolcd_set_intensity(locomolcd_bl_device); | |
172 | return 0; | |
173 | } | |
e4423781 RP |
174 | #endif |
175 | ||
5a3778e2 JH |
176 | static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume); |
177 | ||
8d48427e | 178 | static int locomolcd_probe(struct locomo_dev *ldev) |
987132bb | 179 | { |
a19a6ee6 | 180 | struct backlight_properties props; |
987132bb PM |
181 | unsigned long flags; |
182 | ||
183 | local_irq_save(flags); | |
8d48427e | 184 | locomolcd_dev = ldev; |
987132bb | 185 | |
8d48427e | 186 | locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0); |
e4423781 | 187 | |
9f67675a JH |
188 | /* |
189 | * the poodle_lcd_power function is called for the first time | |
987132bb | 190 | * from fs_initcall, which is before locomo is activated. |
9f67675a JH |
191 | * We need to recall poodle_lcd_power here |
192 | */ | |
e4423781 RP |
193 | if (machine_is_poodle()) |
194 | locomolcd_power(1); | |
195 | ||
987132bb | 196 | local_irq_restore(flags); |
e4423781 | 197 | |
a19a6ee6 | 198 | memset(&props, 0, sizeof(struct backlight_properties)); |
bb7ca747 | 199 | props.type = BACKLIGHT_RAW; |
a19a6ee6 MG |
200 | props.max_brightness = 4; |
201 | locomolcd_bl_device = backlight_device_register("locomo-bl", | |
202 | &ldev->dev, NULL, | |
203 | &locomobl_data, &props); | |
e4423781 | 204 | |
9f67675a JH |
205 | if (IS_ERR(locomolcd_bl_device)) |
206 | return PTR_ERR(locomolcd_bl_device); | |
e4423781 RP |
207 | |
208 | /* Set up frontlight so that screen is readable */ | |
599a52d1 | 209 | locomolcd_bl_device->props.brightness = 2; |
e4423781 RP |
210 | locomolcd_set_intensity(locomolcd_bl_device); |
211 | ||
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212 | return 0; |
213 | } | |
214 | ||
e4423781 | 215 | static int locomolcd_remove(struct locomo_dev *dev) |
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216 | { |
217 | unsigned long flags; | |
e4423781 | 218 | |
2a391a18 RP |
219 | locomolcd_bl_device->props.brightness = 0; |
220 | locomolcd_bl_device->props.power = 0; | |
4437cd1e HMH |
221 | locomolcd_set_intensity(locomolcd_bl_device); |
222 | ||
e4423781 | 223 | backlight_device_unregister(locomolcd_bl_device); |
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224 | local_irq_save(flags); |
225 | locomolcd_dev = NULL; | |
226 | local_irq_restore(flags); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | static struct locomo_driver poodle_lcd_driver = { | |
231 | .drv = { | |
5a3778e2 JH |
232 | .name = "locomo-backlight", |
233 | .pm = &locomolcd_pm_ops, | |
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234 | }, |
235 | .devid = LOCOMO_DEVID_BACKLIGHT, | |
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236 | .probe = locomolcd_probe, |
237 | .remove = locomolcd_remove, | |
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238 | }; |
239 | ||
e4423781 | 240 | static int __init locomolcd_init(void) |
987132bb | 241 | { |
beca98c9 | 242 | return locomo_driver_register(&poodle_lcd_driver); |
987132bb | 243 | } |
987132bb | 244 | |
e4423781 RP |
245 | static void __exit locomolcd_exit(void) |
246 | { | |
247 | locomo_driver_unregister(&poodle_lcd_driver); | |
248 | } | |
249 | ||
250 | module_init(locomolcd_init); | |
251 | module_exit(locomolcd_exit); | |
252 | ||
a2531293 | 253 | MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>"); |
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254 | MODULE_DESCRIPTION("Collie LCD driver"); |
255 | MODULE_LICENSE("GPL"); |