locomolcd.c

  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");