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 
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 
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 
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 static int current_intensity;
111 
112 static int locomolcd_set_intensity(struct backlight_device *bd)
113 {
114 	int intensity = bd->props.brightness;
115 
116 	if (bd->props.power != FB_BLANK_UNBLANK)
117 		intensity = 0;
118 	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
119 		intensity = 0;
120 	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
121 		intensity = 0;
122 
123 	switch (intensity) {
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;
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 
155 static const struct backlight_ops locomobl_data = {
156 	.get_brightness = locomolcd_get_intensity,
157 	.update_status  = locomolcd_set_intensity,
158 };
159 
160 #ifdef CONFIG_PM_SLEEP
161 static int locomolcd_suspend(struct device *dev)
162 {
163 	locomolcd_flags |= LOCOMOLCD_SUSPENDED;
164 	locomolcd_set_intensity(locomolcd_bl_device);
165 	return 0;
166 }
167 
168 static int locomolcd_resume(struct device *dev)
169 {
170 	locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
171 	locomolcd_set_intensity(locomolcd_bl_device);
172 	return 0;
173 }
174 #endif
175 
176 static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
177 
178 static int locomolcd_probe(struct locomo_dev *ldev)
179 {
180 	struct backlight_properties props;
181 	unsigned long flags;
182 
183 	local_irq_save(flags);
184 	locomolcd_dev = ldev;
185 
186 	locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
187 
188 	/*
189 	 * the poodle_lcd_power function is called for the first time
190 	 * from fs_initcall, which is before locomo is activated.
191 	 * We need to recall poodle_lcd_power here
192 	 */
193 	if (machine_is_poodle())
194 		locomolcd_power(1);
195 
196 	local_irq_restore(flags);
197 
198 	memset(&props, 0, sizeof(struct backlight_properties));
199 	props.type = BACKLIGHT_RAW;
200 	props.max_brightness = 4;
201 	locomolcd_bl_device = backlight_device_register("locomo-bl",
202 							&ldev->dev, NULL,
203 							&locomobl_data, &props);
204 
205 	if (IS_ERR(locomolcd_bl_device))
206 		return PTR_ERR(locomolcd_bl_device);
207 
208 	/* Set up frontlight so that screen is readable */
209 	locomolcd_bl_device->props.brightness = 2;
210 	locomolcd_set_intensity(locomolcd_bl_device);
211 
212 	return 0;
213 }
214 
215 static int locomolcd_remove(struct locomo_dev *dev)
216 {
217 	unsigned long flags;
218 
219 	locomolcd_bl_device->props.brightness = 0;
220 	locomolcd_bl_device->props.power = 0;
221 	locomolcd_set_intensity(locomolcd_bl_device);
222 
223 	backlight_device_unregister(locomolcd_bl_device);
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 = {
232 		.name	= "locomo-backlight",
233 		.pm	= &locomolcd_pm_ops,
234 	},
235 	.devid	= LOCOMO_DEVID_BACKLIGHT,
236 	.probe	= locomolcd_probe,
237 	.remove	= locomolcd_remove,
238 };
239 
240 static int __init locomolcd_init(void)
241 {
242 	return locomo_driver_register(&poodle_lcd_driver);
243 }
244 
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 
253 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
254 MODULE_DESCRIPTION("Collie LCD driver");
255 MODULE_LICENSE("GPL");
256