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 
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 
locomolcd_on(int comadj)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 
locomolcd_off(int comadj)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 
locomolcd_power(int on)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 
locomolcd_set_intensity(struct backlight_device * bd)112 static 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 
locomolcd_get_intensity(struct backlight_device * bd)146 static int locomolcd_get_intensity(struct backlight_device *bd)
147 {
148 	return current_intensity;
149 }
150 
151 static 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
locomolcd_suspend(struct device * dev)157 static int locomolcd_suspend(struct device *dev)
158 {
159 	locomolcd_flags |= LOCOMOLCD_SUSPENDED;
160 	locomolcd_set_intensity(locomolcd_bl_device);
161 	return 0;
162 }
163 
locomolcd_resume(struct device * dev)164 static 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 
172 static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
173 
locomolcd_probe(struct locomo_dev * ldev)174 static 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 
locomolcd_remove(struct locomo_dev * dev)211 static void 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 }
224 
225 static struct locomo_driver poodle_lcd_driver = {
226 	.drv = {
227 		.name	= "locomo-backlight",
228 		.pm	= &locomolcd_pm_ops,
229 	},
230 	.devid	= LOCOMO_DEVID_BACKLIGHT,
231 	.probe	= locomolcd_probe,
232 	.remove	= locomolcd_remove,
233 };
234 
locomolcd_init(void)235 static int __init locomolcd_init(void)
236 {
237 	return locomo_driver_register(&poodle_lcd_driver);
238 }
239 
locomolcd_exit(void)240 static void __exit locomolcd_exit(void)
241 {
242 	locomo_driver_unregister(&poodle_lcd_driver);
243 }
244 
245 module_init(locomolcd_init);
246 module_exit(locomolcd_exit);
247 
248 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
249 MODULE_DESCRIPTION("Collie LCD driver");
250 MODULE_LICENSE("GPL");
251