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	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}
108EXPORT_SYMBOL(locomolcd_power);
109
110static int current_intensity;
111
112static int locomolcd_set_intensity(struct backlight_device *bd)
113{
114	int intensity = backlight_get_brightness(bd);
115
116	if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
117		intensity = 0;
118
119	switch (intensity) {
120	/*
121	 * AC and non-AC are handled differently,
122	 * but produce same results in sharp code?
123	 */
124	case 0:
125		locomo_frontlight_set(locomolcd_dev, 0, 0, 161);
126		break;
127	case 1:
128		locomo_frontlight_set(locomolcd_dev, 117, 0, 161);
129		break;
130	case 2:
131		locomo_frontlight_set(locomolcd_dev, 163, 0, 148);
132		break;
133	case 3:
134		locomo_frontlight_set(locomolcd_dev, 194, 0, 161);
135		break;
136	case 4:
137		locomo_frontlight_set(locomolcd_dev, 194, 1, 161);
138		break;
139	default:
140		return -ENODEV;
141	}
142	current_intensity = intensity;
143	return 0;
144}
145
146static int locomolcd_get_intensity(struct backlight_device *bd)
147{
148	return current_intensity;
149}
150
151static const struct backlight_ops locomobl_data = {
152	.get_brightness = locomolcd_get_intensity,
153	.update_status  = locomolcd_set_intensity,
154};
155
156#ifdef CONFIG_PM_SLEEP
157static int locomolcd_suspend(struct device *dev)
158{
159	locomolcd_flags |= LOCOMOLCD_SUSPENDED;
160	locomolcd_set_intensity(locomolcd_bl_device);
161	return 0;
162}
163
164static int locomolcd_resume(struct device *dev)
165{
166	locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
167	locomolcd_set_intensity(locomolcd_bl_device);
168	return 0;
169}
170#endif
171
172static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
173
174static int locomolcd_probe(struct locomo_dev *ldev)
175{
176	struct backlight_properties props;
177	unsigned long flags;
178
179	local_irq_save(flags);
180	locomolcd_dev = ldev;
181
182	locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
183
184	/*
185	 * the poodle_lcd_power function is called for the first time
186	 * from fs_initcall, which is before locomo is activated.
187	 * We need to recall poodle_lcd_power here
188	 */
189	if (machine_is_poodle())
190		locomolcd_power(1);
191
192	local_irq_restore(flags);
193
194	memset(&props, 0, sizeof(struct backlight_properties));
195	props.type = BACKLIGHT_RAW;
196	props.max_brightness = 4;
197	locomolcd_bl_device = backlight_device_register("locomo-bl",
198							&ldev->dev, NULL,
199							&locomobl_data, &props);
200
201	if (IS_ERR(locomolcd_bl_device))
202		return PTR_ERR(locomolcd_bl_device);
203
204	/* Set up frontlight so that screen is readable */
205	locomolcd_bl_device->props.brightness = 2;
206	locomolcd_set_intensity(locomolcd_bl_device);
207
208	return 0;
209}
210
211static int locomolcd_remove(struct locomo_dev *dev)
212{
213	unsigned long flags;
214
215	locomolcd_bl_device->props.brightness = 0;
216	locomolcd_bl_device->props.power = 0;
217	locomolcd_set_intensity(locomolcd_bl_device);
218
219	backlight_device_unregister(locomolcd_bl_device);
220	local_irq_save(flags);
221	locomolcd_dev = NULL;
222	local_irq_restore(flags);
223	return 0;
224}
225
226static struct locomo_driver poodle_lcd_driver = {
227	.drv = {
228		.name	= "locomo-backlight",
229		.pm	= &locomolcd_pm_ops,
230	},
231	.devid	= LOCOMO_DEVID_BACKLIGHT,
232	.probe	= locomolcd_probe,
233	.remove	= locomolcd_remove,
234};
235
236static int __init locomolcd_init(void)
237{
238	return locomo_driver_register(&poodle_lcd_driver);
239}
240
241static void __exit locomolcd_exit(void)
242{
243	locomo_driver_unregister(&poodle_lcd_driver);
244}
245
246module_init(locomolcd_init);
247module_exit(locomolcd_exit);
248
249MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
250MODULE_DESCRIPTION("Collie LCD driver");
251MODULE_LICENSE("GPL");
252