tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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/backlight.h>
20
21#include <asm/hardware/locomo.h>
22#include <asm/irq.h>
23#include <asm/mach/sharpsl_param.h>
24#include <asm/mach-types.h>
25
26#include "../../../arch/arm/mach-sa1100/generic.h"
27
28static struct backlight_device *locomolcd_bl_device;
29static struct locomo_dev *locomolcd_dev;
30static unsigned long locomolcd_flags;
31#define LOCOMOLCD_SUSPENDED 0x01
32
33static void locomolcd_on(int comadj)
34{
35 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
36 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 1);
37 mdelay(2);
38
39 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
40 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 1);
41 mdelay(2);
42
43 locomo_m62332_senddata(locomolcd_dev, comadj, 0);
44 mdelay(5);
45
46 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
47 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 1);
48 mdelay(10);
49
50 /* TFTCRST | CPSOUT=0 | CPSEN */
51 locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
52
53 /* Set CPSD */
54 locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
55
56 /* TFTCRST | CPSOUT=0 | CPSEN */
57 locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
58 mdelay(10);
59
60 locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
61 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 1);
62}
63
64static void locomolcd_off(int comadj)
65{
66 /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
67 locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
68 mdelay(1);
69
70 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
71 mdelay(110);
72
73 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
74 mdelay(700);
75
76 /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
77 locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);
78 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
79 locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
80}
81
82void locomolcd_power(int on)
83{
84 int comadj = sharpsl_param.comadj;
85 unsigned long flags;
86
87 local_irq_save(flags);
88
89 if (!locomolcd_dev) {
90 local_irq_restore(flags);
91 return;
92 }
93
94 /* read comadj */
95 if (comadj == -1 && machine_is_collie())
96 comadj = 128;
97
98 if (on)
99 locomolcd_on(comadj);
100 else
101 locomolcd_off(comadj);
102
103 local_irq_restore(flags);
104}
105EXPORT_SYMBOL(locomolcd_power);
106
107static int current_intensity;
108
109static int locomolcd_set_intensity(struct backlight_device *bd)
110{
111 int intensity = backlight_get_brightness(bd);
112
113 if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
114 intensity = 0;
115
116 switch (intensity) {
117 /*
118 * AC and non-AC are handled differently,
119 * but produce same results in sharp code?
120 */
121 case 0:
122 locomo_frontlight_set(locomolcd_dev, 0, 0, 161);
123 break;
124 case 1:
125 locomo_frontlight_set(locomolcd_dev, 117, 0, 161);
126 break;
127 case 2:
128 locomo_frontlight_set(locomolcd_dev, 163, 0, 148);
129 break;
130 case 3:
131 locomo_frontlight_set(locomolcd_dev, 194, 0, 161);
132 break;
133 case 4:
134 locomo_frontlight_set(locomolcd_dev, 194, 1, 161);
135 break;
136 default:
137 return -ENODEV;
138 }
139 current_intensity = intensity;
140 return 0;
141}
142
143static int locomolcd_get_intensity(struct backlight_device *bd)
144{
145 return current_intensity;
146}
147
148static const struct backlight_ops locomobl_data = {
149 .get_brightness = locomolcd_get_intensity,
150 .update_status = locomolcd_set_intensity,
151};
152
153#ifdef CONFIG_PM_SLEEP
154static int locomolcd_suspend(struct device *dev)
155{
156 locomolcd_flags |= LOCOMOLCD_SUSPENDED;
157 locomolcd_set_intensity(locomolcd_bl_device);
158 return 0;
159}
160
161static int locomolcd_resume(struct device *dev)
162{
163 locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
164 locomolcd_set_intensity(locomolcd_bl_device);
165 return 0;
166}
167#endif
168
169static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
170
171static int locomolcd_probe(struct locomo_dev *ldev)
172{
173 struct backlight_properties props;
174 unsigned long flags;
175
176 local_irq_save(flags);
177 locomolcd_dev = ldev;
178
179 locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
180
181 local_irq_restore(flags);
182
183 memset(&props, 0, sizeof(struct backlight_properties));
184 props.type = BACKLIGHT_RAW;
185 props.max_brightness = 4;
186 locomolcd_bl_device = backlight_device_register("locomo-bl",
187 &ldev->dev, NULL,
188 &locomobl_data, &props);
189
190 if (IS_ERR(locomolcd_bl_device))
191 return PTR_ERR(locomolcd_bl_device);
192
193 /* Set up frontlight so that screen is readable */
194 locomolcd_bl_device->props.brightness = 2;
195 locomolcd_set_intensity(locomolcd_bl_device);
196
197 return 0;
198}
199
200static void locomolcd_remove(struct locomo_dev *dev)
201{
202 unsigned long flags;
203
204 locomolcd_bl_device->props.brightness = 0;
205 locomolcd_bl_device->props.power = 0;
206 locomolcd_set_intensity(locomolcd_bl_device);
207
208 backlight_device_unregister(locomolcd_bl_device);
209 local_irq_save(flags);
210 locomolcd_dev = NULL;
211 local_irq_restore(flags);
212}
213
214static struct locomo_driver poodle_lcd_driver = {
215 .drv = {
216 .name = "locomo-backlight",
217 .pm = &locomolcd_pm_ops,
218 },
219 .devid = LOCOMO_DEVID_BACKLIGHT,
220 .probe = locomolcd_probe,
221 .remove = locomolcd_remove,
222};
223
224static int __init locomolcd_init(void)
225{
226 return locomo_driver_register(&poodle_lcd_driver);
227}
228
229static void __exit locomolcd_exit(void)
230{
231 locomo_driver_unregister(&poodle_lcd_driver);
232}
233
234module_init(locomolcd_init);
235module_exit(locomolcd_exit);
236
237MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
238MODULE_DESCRIPTION("Collie LCD driver");
239MODULE_LICENSE("GPL");