1fb9e53ccSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2987132bbSPavel Machek /*
3987132bbSPavel Machek * Backlight control code for Sharp Zaurus SL-5500
4987132bbSPavel Machek *
5987132bbSPavel Machek * Copyright 2005 John Lenz <lenz@cs.wisc.edu>
6a2531293SPavel Machek * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)
7987132bbSPavel Machek *
8987132bbSPavel Machek * This driver assumes single CPU. That's okay, because collie is
9987132bbSPavel Machek * slightly old hardware, and no one is going to retrofit second CPU to
10987132bbSPavel Machek * old PDA.
11987132bbSPavel Machek */
12987132bbSPavel Machek
13987132bbSPavel Machek /* LCD power functions */
14987132bbSPavel Machek #include <linux/module.h>
15987132bbSPavel Machek #include <linux/init.h>
16987132bbSPavel Machek #include <linux/delay.h>
17987132bbSPavel Machek #include <linux/device.h>
18987132bbSPavel Machek #include <linux/interrupt.h>
19e4423781SRichard Purdie #include <linux/fb.h>
20e4423781SRichard Purdie #include <linux/backlight.h>
21987132bbSPavel Machek
22987132bbSPavel Machek #include <asm/hardware/locomo.h>
23987132bbSPavel Machek #include <asm/irq.h>
2436a95bf5SPavel Machek #include <asm/mach/sharpsl_param.h>
2536a95bf5SPavel Machek #include <asm/mach-types.h>
26987132bbSPavel Machek
2736a95bf5SPavel Machek #include "../../../arch/arm/mach-sa1100/generic.h"
28987132bbSPavel Machek
29e4423781SRichard Purdie static struct backlight_device *locomolcd_bl_device;
30987132bbSPavel Machek static struct locomo_dev *locomolcd_dev;
31e4423781SRichard Purdie static unsigned long locomolcd_flags;
32e4423781SRichard Purdie #define LOCOMOLCD_SUSPENDED 0x01
33987132bbSPavel Machek
locomolcd_on(int comadj)34987132bbSPavel Machek static void locomolcd_on(int comadj)
35987132bbSPavel Machek {
368d48427eSRichard Purdie locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
378d48427eSRichard Purdie locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 1);
38987132bbSPavel Machek mdelay(2);
39987132bbSPavel Machek
408d48427eSRichard Purdie locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
418d48427eSRichard Purdie locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 1);
42987132bbSPavel Machek mdelay(2);
43987132bbSPavel Machek
44987132bbSPavel Machek locomo_m62332_senddata(locomolcd_dev, comadj, 0);
45987132bbSPavel Machek mdelay(5);
46987132bbSPavel Machek
478d48427eSRichard Purdie locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
488d48427eSRichard Purdie locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 1);
49987132bbSPavel Machek mdelay(10);
50987132bbSPavel Machek
51987132bbSPavel Machek /* TFTCRST | CPSOUT=0 | CPSEN */
52987132bbSPavel Machek locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
53987132bbSPavel Machek
54987132bbSPavel Machek /* Set CPSD */
55987132bbSPavel Machek locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
56987132bbSPavel Machek
57987132bbSPavel Machek /* TFTCRST | CPSOUT=0 | CPSEN */
58987132bbSPavel Machek locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
59987132bbSPavel Machek mdelay(10);
60987132bbSPavel Machek
618d48427eSRichard Purdie locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
628d48427eSRichard Purdie locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 1);
63987132bbSPavel Machek }
64987132bbSPavel Machek
locomolcd_off(int comadj)65987132bbSPavel Machek static void locomolcd_off(int comadj)
66987132bbSPavel Machek {
67987132bbSPavel Machek /* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
68987132bbSPavel Machek locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
69987132bbSPavel Machek mdelay(1);
70987132bbSPavel Machek
718d48427eSRichard Purdie locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
72987132bbSPavel Machek mdelay(110);
73987132bbSPavel Machek
748d48427eSRichard Purdie locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
75987132bbSPavel Machek mdelay(700);
76987132bbSPavel Machek
77987132bbSPavel Machek /* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
78987132bbSPavel Machek locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);
798d48427eSRichard Purdie locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
808d48427eSRichard Purdie locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
81987132bbSPavel Machek }
82987132bbSPavel Machek
locomolcd_power(int on)83987132bbSPavel Machek void locomolcd_power(int on)
84987132bbSPavel Machek {
8536a95bf5SPavel Machek int comadj = sharpsl_param.comadj;
86987132bbSPavel Machek unsigned long flags;
87987132bbSPavel Machek
88987132bbSPavel Machek local_irq_save(flags);
89987132bbSPavel Machek
90987132bbSPavel Machek if (!locomolcd_dev) {
91987132bbSPavel Machek local_irq_restore(flags);
92987132bbSPavel Machek return;
93987132bbSPavel Machek }
94987132bbSPavel Machek
95987132bbSPavel Machek /* read comadj */
96e4423781SRichard Purdie if (comadj == -1 && machine_is_collie())
97987132bbSPavel Machek comadj = 128;
98987132bbSPavel Machek
99987132bbSPavel Machek if (on)
100987132bbSPavel Machek locomolcd_on(comadj);
101987132bbSPavel Machek else
102987132bbSPavel Machek locomolcd_off(comadj);
103987132bbSPavel Machek
104987132bbSPavel Machek local_irq_restore(flags);
105987132bbSPavel Machek }
106987132bbSPavel Machek EXPORT_SYMBOL(locomolcd_power);
107987132bbSPavel Machek
108e4423781SRichard Purdie static int current_intensity;
109e4423781SRichard Purdie
locomolcd_set_intensity(struct backlight_device * bd)110e4423781SRichard Purdie static int locomolcd_set_intensity(struct backlight_device *bd)
111e4423781SRichard Purdie {
11251d53e5bSSam Ravnborg int intensity = backlight_get_brightness(bd);
113e4423781SRichard Purdie
114e4423781SRichard Purdie if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
115e4423781SRichard Purdie intensity = 0;
116e4423781SRichard Purdie
117e4423781SRichard Purdie switch (intensity) {
1189f67675aSJingoo Han /*
1199f67675aSJingoo Han * AC and non-AC are handled differently,
1209f67675aSJingoo Han * but produce same results in sharp code?
1219f67675aSJingoo Han */
1229f67675aSJingoo Han case 0:
1239f67675aSJingoo Han locomo_frontlight_set(locomolcd_dev, 0, 0, 161);
1249f67675aSJingoo Han break;
1259f67675aSJingoo Han case 1:
1269f67675aSJingoo Han locomo_frontlight_set(locomolcd_dev, 117, 0, 161);
1279f67675aSJingoo Han break;
1289f67675aSJingoo Han case 2:
1299f67675aSJingoo Han locomo_frontlight_set(locomolcd_dev, 163, 0, 148);
1309f67675aSJingoo Han break;
1319f67675aSJingoo Han case 3:
1329f67675aSJingoo Han locomo_frontlight_set(locomolcd_dev, 194, 0, 161);
1339f67675aSJingoo Han break;
1349f67675aSJingoo Han case 4:
1359f67675aSJingoo Han locomo_frontlight_set(locomolcd_dev, 194, 1, 161);
1369f67675aSJingoo Han break;
137e4423781SRichard Purdie default:
138e4423781SRichard Purdie return -ENODEV;
139e4423781SRichard Purdie }
140e4423781SRichard Purdie current_intensity = intensity;
141e4423781SRichard Purdie return 0;
142e4423781SRichard Purdie }
143e4423781SRichard Purdie
locomolcd_get_intensity(struct backlight_device * bd)144e4423781SRichard Purdie static int locomolcd_get_intensity(struct backlight_device *bd)
145e4423781SRichard Purdie {
146e4423781SRichard Purdie return current_intensity;
147e4423781SRichard Purdie }
148e4423781SRichard Purdie
1499905a43bSEmese Revfy static const struct backlight_ops locomobl_data = {
150e4423781SRichard Purdie .get_brightness = locomolcd_get_intensity,
151e4423781SRichard Purdie .update_status = locomolcd_set_intensity,
152e4423781SRichard Purdie };
153e4423781SRichard Purdie
1545a3778e2SJingoo Han #ifdef CONFIG_PM_SLEEP
locomolcd_suspend(struct device * dev)1555a3778e2SJingoo Han static int locomolcd_suspend(struct device *dev)
156e4423781SRichard Purdie {
157e4423781SRichard Purdie locomolcd_flags |= LOCOMOLCD_SUSPENDED;
158e4423781SRichard Purdie locomolcd_set_intensity(locomolcd_bl_device);
159e4423781SRichard Purdie return 0;
160e4423781SRichard Purdie }
161e4423781SRichard Purdie
locomolcd_resume(struct device * dev)1625a3778e2SJingoo Han static int locomolcd_resume(struct device *dev)
163e4423781SRichard Purdie {
164e4423781SRichard Purdie locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
165e4423781SRichard Purdie locomolcd_set_intensity(locomolcd_bl_device);
166e4423781SRichard Purdie return 0;
167e4423781SRichard Purdie }
168e4423781SRichard Purdie #endif
169e4423781SRichard Purdie
1705a3778e2SJingoo Han static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
1715a3778e2SJingoo Han
locomolcd_probe(struct locomo_dev * ldev)1728d48427eSRichard Purdie static int locomolcd_probe(struct locomo_dev *ldev)
173987132bbSPavel Machek {
174a19a6ee6SMatthew Garrett struct backlight_properties props;
175987132bbSPavel Machek unsigned long flags;
176987132bbSPavel Machek
177987132bbSPavel Machek local_irq_save(flags);
1788d48427eSRichard Purdie locomolcd_dev = ldev;
179987132bbSPavel Machek
1808d48427eSRichard Purdie locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
181e4423781SRichard Purdie
182987132bbSPavel Machek local_irq_restore(flags);
183e4423781SRichard Purdie
184a19a6ee6SMatthew Garrett memset(&props, 0, sizeof(struct backlight_properties));
185bb7ca747SMatthew Garrett props.type = BACKLIGHT_RAW;
186a19a6ee6SMatthew Garrett props.max_brightness = 4;
187a19a6ee6SMatthew Garrett locomolcd_bl_device = backlight_device_register("locomo-bl",
188a19a6ee6SMatthew Garrett &ldev->dev, NULL,
189a19a6ee6SMatthew Garrett &locomobl_data, &props);
190e4423781SRichard Purdie
191e4423781SRichard Purdie if (IS_ERR(locomolcd_bl_device))
192e4423781SRichard Purdie return PTR_ERR(locomolcd_bl_device);
193e4423781SRichard Purdie
194e4423781SRichard Purdie /* Set up frontlight so that screen is readable */
195599a52d1SRichard Purdie locomolcd_bl_device->props.brightness = 2;
196e4423781SRichard Purdie locomolcd_set_intensity(locomolcd_bl_device);
197e4423781SRichard Purdie
198987132bbSPavel Machek return 0;
199987132bbSPavel Machek }
200987132bbSPavel Machek
locomolcd_remove(struct locomo_dev * dev)201*33d6d2bbSUwe Kleine-König static void locomolcd_remove(struct locomo_dev *dev)
202987132bbSPavel Machek {
203987132bbSPavel Machek unsigned long flags;
204e4423781SRichard Purdie
2052a391a18SRichard Purdie locomolcd_bl_device->props.brightness = 0;
2062a391a18SRichard Purdie locomolcd_bl_device->props.power = 0;
2074437cd1eSHenrique de Moraes Holschuh locomolcd_set_intensity(locomolcd_bl_device);
2084437cd1eSHenrique de Moraes Holschuh
209e4423781SRichard Purdie backlight_device_unregister(locomolcd_bl_device);
210987132bbSPavel Machek local_irq_save(flags);
211987132bbSPavel Machek locomolcd_dev = NULL;
212987132bbSPavel Machek local_irq_restore(flags);
213987132bbSPavel Machek }
214987132bbSPavel Machek
215987132bbSPavel Machek static struct locomo_driver poodle_lcd_driver = {
216987132bbSPavel Machek .drv = {
217987132bbSPavel Machek .name = "locomo-backlight",
2185a3778e2SJingoo Han .pm = &locomolcd_pm_ops,
219987132bbSPavel Machek },
220987132bbSPavel Machek .devid = LOCOMO_DEVID_BACKLIGHT,
221e4423781SRichard Purdie .probe = locomolcd_probe,
222e4423781SRichard Purdie .remove = locomolcd_remove,
223987132bbSPavel Machek };
224987132bbSPavel Machek
locomolcd_init(void)225e4423781SRichard Purdie static int __init locomolcd_init(void)
226987132bbSPavel Machek {
227beca98c9SPaul Gortmaker return locomo_driver_register(&poodle_lcd_driver);
228987132bbSPavel Machek }
229987132bbSPavel Machek
locomolcd_exit(void)230e4423781SRichard Purdie static void __exit locomolcd_exit(void)
231e4423781SRichard Purdie {
232e4423781SRichard Purdie locomo_driver_unregister(&poodle_lcd_driver);
233e4423781SRichard Purdie }
234e4423781SRichard Purdie
235e4423781SRichard Purdie module_init(locomolcd_init);
236e4423781SRichard Purdie module_exit(locomolcd_exit);
237e4423781SRichard Purdie
238a2531293SPavel Machek MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
239e4423781SRichard Purdie MODULE_DESCRIPTION("Collie LCD driver");
240e4423781SRichard Purdie MODULE_LICENSE("GPL");
241