1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Backlight control code for Sharp Zaurus SL-5500
4 *
5 * Copyright 2005 John Lenz <lenz@cs.wisc.edu>
6 * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)
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
29static struct backlight_device *locomolcd_bl_device;
30static struct locomo_dev *locomolcd_dev;
31static unsigned long locomolcd_flags;
32#define LOCOMOLCD_SUSPENDED 0x01
33
34static 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
65static 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
83void 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
99 if (on)
100 locomolcd_on(comadj);
101 else
102 locomolcd_off(comadj);
103
104 local_irq_restore(flags);
105}
106EXPORT_SYMBOL(locomolcd_power);
107
108static int current_intensity;
109
110static int locomolcd_set_intensity(struct backlight_device *bd)
111{
112 int intensity = backlight_get_brightness(bd);
113
114 if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
115 intensity = 0;
116
117 switch (intensity) {
118 /*
119 * AC and non-AC are handled differently,
120 * but produce same results in sharp code?
121 */
122 case 0:
123 locomo_frontlight_set(locomolcd_dev, 0, 0, 161);
124 break;
125 case 1:
126 locomo_frontlight_set(locomolcd_dev, 117, 0, 161);
127 break;
128 case 2:
129 locomo_frontlight_set(locomolcd_dev, 163, 0, 148);
130 break;
131 case 3:
132 locomo_frontlight_set(locomolcd_dev, 194, 0, 161);
133 break;
134 case 4:
135 locomo_frontlight_set(locomolcd_dev, 194, 1, 161);
136 break;
137 default:
138 return -ENODEV;
139 }
140 current_intensity = intensity;
141 return 0;
142}
143
144static int locomolcd_get_intensity(struct backlight_device *bd)
145{
146 return current_intensity;
147}
148
149static const struct backlight_ops locomobl_data = {
150 .get_brightness = locomolcd_get_intensity,
151 .update_status = locomolcd_set_intensity,
152};
153
154#ifdef CONFIG_PM_SLEEP
155static int locomolcd_suspend(struct device *dev)
156{
157 locomolcd_flags |= LOCOMOLCD_SUSPENDED;
158 locomolcd_set_intensity(bd: locomolcd_bl_device);
159 return 0;
160}
161
162static int locomolcd_resume(struct device *dev)
163{
164 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
165 locomolcd_set_intensity(bd: locomolcd_bl_device);
166 return 0;
167}
168#endif
169
170static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
171
172static int locomolcd_probe(struct locomo_dev *ldev)
173{
174 struct backlight_properties props;
175 unsigned long flags;
176
177 local_irq_save(flags);
178 locomolcd_dev = ldev;
179
180 locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
181
182 local_irq_restore(flags);
183
184 memset(&props, 0, sizeof(struct backlight_properties));
185 props.type = BACKLIGHT_RAW;
186 props.max_brightness = 4;
187 locomolcd_bl_device = backlight_device_register(name: "locomo-bl",
188 dev: &ldev->dev, NULL,
189 ops: &locomobl_data, props: &props);
190
191 if (IS_ERR(ptr: locomolcd_bl_device))
192 return PTR_ERR(ptr: locomolcd_bl_device);
193
194 /* Set up frontlight so that screen is readable */
195 locomolcd_bl_device->props.brightness = 2;
196 locomolcd_set_intensity(bd: locomolcd_bl_device);
197
198 return 0;
199}
200
201static void locomolcd_remove(struct locomo_dev *dev)
202{
203 unsigned long flags;
204
205 locomolcd_bl_device->props.brightness = 0;
206 locomolcd_bl_device->props.power = 0;
207 locomolcd_set_intensity(bd: locomolcd_bl_device);
208
209 backlight_device_unregister(bd: locomolcd_bl_device);
210 local_irq_save(flags);
211 locomolcd_dev = NULL;
212 local_irq_restore(flags);
213}
214
215static struct locomo_driver poodle_lcd_driver = {
216 .drv = {
217 .name = "locomo-backlight",
218 .pm = &locomolcd_pm_ops,
219 },
220 .devid = LOCOMO_DEVID_BACKLIGHT,
221 .probe = locomolcd_probe,
222 .remove = locomolcd_remove,
223};
224
225static int __init locomolcd_init(void)
226{
227 return locomo_driver_register(&poodle_lcd_driver);
228}
229
230static void __exit locomolcd_exit(void)
231{
232 locomo_driver_unregister(&poodle_lcd_driver);
233}
234
235module_init(locomolcd_init);
236module_exit(locomolcd_exit);
237
238MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
239MODULE_DESCRIPTION("Collie LCD driver");
240MODULE_LICENSE("GPL");
241

source code of linux/drivers/video/backlight/locomolcd.c