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 */
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 
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_ops locomobl_data = {
145 	.get_brightness = locomolcd_get_intensity,
146 	.update_status  = locomolcd_set_intensity,
147 };
148 
149 #ifdef CONFIG_PM
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 
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 
168 static int locomolcd_probe(struct locomo_dev *ldev)
169 {
170 	unsigned long flags;
171 
172 	local_irq_save(flags);
173 	locomolcd_dev = ldev;
174 
175 	locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
176 
177 	/* the poodle_lcd_power function is called for the first time
178 	 * from fs_initcall, which is before locomo is activated.
179 	 * We need to recall poodle_lcd_power here*/
180 	if (machine_is_poodle())
181 		locomolcd_power(1);
182 
183 	local_irq_restore(flags);
184 
185 	locomolcd_bl_device = backlight_device_register("locomo-bl", &ldev->dev, NULL, &locomobl_data);
186 
187 	if (IS_ERR (locomolcd_bl_device))
188 		return PTR_ERR (locomolcd_bl_device);
189 
190 	/* Set up frontlight so that screen is readable */
191 	locomolcd_bl_device->props.max_brightness = 4,
192 	locomolcd_bl_device->props.brightness = 2;
193 	locomolcd_set_intensity(locomolcd_bl_device);
194 
195 	return 0;
196 }
197 
198 static int locomolcd_remove(struct locomo_dev *dev)
199 {
200 	unsigned long flags;
201 
202 	locomolcd_bl_device->props.brightness = 0;
203 	locomolcd_bl_device->props.power = 0;
204 	locomolcd_set_intensity(locomolcd_bl_device);
205 
206 	backlight_device_unregister(locomolcd_bl_device);
207 	local_irq_save(flags);
208 	locomolcd_dev = NULL;
209 	local_irq_restore(flags);
210 	return 0;
211 }
212 
213 static struct locomo_driver poodle_lcd_driver = {
214 	.drv = {
215 		.name = "locomo-backlight",
216 	},
217 	.devid	= LOCOMO_DEVID_BACKLIGHT,
218 	.probe	= locomolcd_probe,
219 	.remove	= locomolcd_remove,
220 	.suspend = locomolcd_suspend,
221 	.resume = locomolcd_resume,
222 };
223 
224 
225 static int __init locomolcd_init(void)
226 {
227 	int ret = locomo_driver_register(&poodle_lcd_driver);
228 	if (ret)
229 		return ret;
230 
231 #ifdef CONFIG_SA1100_COLLIE
232 	sa1100fb_lcd_power = locomolcd_power;
233 #endif
234 	return 0;
235 }
236 
237 static void __exit locomolcd_exit(void)
238 {
239 	locomo_driver_unregister(&poodle_lcd_driver);
240 }
241 
242 module_init(locomolcd_init);
243 module_exit(locomolcd_exit);
244 
245 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@suse.cz>");
246 MODULE_DESCRIPTION("Collie LCD driver");
247 MODULE_LICENSE("GPL");
248