1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2d03ebb12SClaudio Nieder /*
3d03ebb12SClaudio Nieder * Backlight Driver for the KB3886 Backlight
4d03ebb12SClaudio Nieder *
5d03ebb12SClaudio Nieder * Copyright (c) 2007-2008 Claudio Nieder
6d03ebb12SClaudio Nieder *
7d03ebb12SClaudio Nieder * Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle
8d03ebb12SClaudio Nieder */
9d03ebb12SClaudio Nieder
10d03ebb12SClaudio Nieder #include <linux/module.h>
11d03ebb12SClaudio Nieder #include <linux/kernel.h>
12d03ebb12SClaudio Nieder #include <linux/init.h>
13d03ebb12SClaudio Nieder #include <linux/platform_device.h>
14d03ebb12SClaudio Nieder #include <linux/mutex.h>
15d03ebb12SClaudio Nieder #include <linux/fb.h>
16d03ebb12SClaudio Nieder #include <linux/backlight.h>
17d03ebb12SClaudio Nieder #include <linux/delay.h>
18d03ebb12SClaudio Nieder #include <linux/dmi.h>
19d03ebb12SClaudio Nieder
20d03ebb12SClaudio Nieder #define KB3886_PARENT 0x64
21d03ebb12SClaudio Nieder #define KB3886_IO 0x60
22d03ebb12SClaudio Nieder #define KB3886_ADC_DAC_PWM 0xC4
23d03ebb12SClaudio Nieder #define KB3886_PWM0_WRITE 0x81
24d03ebb12SClaudio Nieder #define KB3886_PWM0_READ 0x41
25d03ebb12SClaudio Nieder
26d03ebb12SClaudio Nieder static DEFINE_MUTEX(bl_mutex);
27d03ebb12SClaudio Nieder
kb3886_bl_set_intensity(int intensity)28d03ebb12SClaudio Nieder static void kb3886_bl_set_intensity(int intensity)
29d03ebb12SClaudio Nieder {
30d03ebb12SClaudio Nieder mutex_lock(&bl_mutex);
31d03ebb12SClaudio Nieder intensity = intensity&0xff;
32d03ebb12SClaudio Nieder outb(KB3886_ADC_DAC_PWM, KB3886_PARENT);
337c9332d1SJingoo Han usleep_range(10000, 11000);
34d03ebb12SClaudio Nieder outb(KB3886_PWM0_WRITE, KB3886_IO);
357c9332d1SJingoo Han usleep_range(10000, 11000);
36d03ebb12SClaudio Nieder outb(intensity, KB3886_IO);
37d03ebb12SClaudio Nieder mutex_unlock(&bl_mutex);
38d03ebb12SClaudio Nieder }
39d03ebb12SClaudio Nieder
40d03ebb12SClaudio Nieder struct kb3886bl_machinfo {
41d03ebb12SClaudio Nieder int max_intensity;
42d03ebb12SClaudio Nieder int default_intensity;
43d03ebb12SClaudio Nieder int limit_mask;
44d03ebb12SClaudio Nieder void (*set_bl_intensity)(int intensity);
45d03ebb12SClaudio Nieder };
46d03ebb12SClaudio Nieder
47d03ebb12SClaudio Nieder static struct kb3886bl_machinfo kb3886_bl_machinfo = {
48d03ebb12SClaudio Nieder .max_intensity = 0xff,
49d03ebb12SClaudio Nieder .default_intensity = 0xa0,
50d03ebb12SClaudio Nieder .limit_mask = 0x7f,
51d03ebb12SClaudio Nieder .set_bl_intensity = kb3886_bl_set_intensity,
52d03ebb12SClaudio Nieder };
53d03ebb12SClaudio Nieder
54d03ebb12SClaudio Nieder static struct platform_device kb3886bl_device = {
55d03ebb12SClaudio Nieder .name = "kb3886-bl",
56d03ebb12SClaudio Nieder .dev = {
57d03ebb12SClaudio Nieder .platform_data = &kb3886_bl_machinfo,
58d03ebb12SClaudio Nieder },
59d03ebb12SClaudio Nieder .id = -1,
60d03ebb12SClaudio Nieder };
61d03ebb12SClaudio Nieder
62d03ebb12SClaudio Nieder static struct platform_device *devices[] __initdata = {
63d03ebb12SClaudio Nieder &kb3886bl_device,
64d03ebb12SClaudio Nieder };
65d03ebb12SClaudio Nieder
66d03ebb12SClaudio Nieder /*
67d03ebb12SClaudio Nieder * Back to driver
68d03ebb12SClaudio Nieder */
69d03ebb12SClaudio Nieder
70d03ebb12SClaudio Nieder static int kb3886bl_intensity;
71d03ebb12SClaudio Nieder static struct backlight_device *kb3886_backlight_device;
72d03ebb12SClaudio Nieder static struct kb3886bl_machinfo *bl_machinfo;
73d03ebb12SClaudio Nieder
74d03ebb12SClaudio Nieder static unsigned long kb3886bl_flags;
75d03ebb12SClaudio Nieder #define KB3886BL_SUSPENDED 0x01
76d03ebb12SClaudio Nieder
776faadbbbSChristoph Hellwig static const struct dmi_system_id kb3886bl_device_table[] __initconst = {
78d03ebb12SClaudio Nieder {
79d03ebb12SClaudio Nieder .ident = "Sahara Touch-iT",
80d03ebb12SClaudio Nieder .matches = {
81d03ebb12SClaudio Nieder DMI_MATCH(DMI_SYS_VENDOR, "SDV"),
82d03ebb12SClaudio Nieder DMI_MATCH(DMI_PRODUCT_NAME, "iTouch T201"),
83d03ebb12SClaudio Nieder },
84d03ebb12SClaudio Nieder },
85d03ebb12SClaudio Nieder { }
86d03ebb12SClaudio Nieder };
87d03ebb12SClaudio Nieder
kb3886bl_send_intensity(struct backlight_device * bd)88d03ebb12SClaudio Nieder static int kb3886bl_send_intensity(struct backlight_device *bd)
89d03ebb12SClaudio Nieder {
9051d53e5bSSam Ravnborg int intensity = backlight_get_brightness(bd);
91d03ebb12SClaudio Nieder
92d03ebb12SClaudio Nieder if (kb3886bl_flags & KB3886BL_SUSPENDED)
93d03ebb12SClaudio Nieder intensity = 0;
94d03ebb12SClaudio Nieder
95d03ebb12SClaudio Nieder bl_machinfo->set_bl_intensity(intensity);
96d03ebb12SClaudio Nieder
97d03ebb12SClaudio Nieder kb3886bl_intensity = intensity;
98d03ebb12SClaudio Nieder return 0;
99d03ebb12SClaudio Nieder }
100d03ebb12SClaudio Nieder
101f10a46cfSJingoo Han #ifdef CONFIG_PM_SLEEP
kb3886bl_suspend(struct device * dev)102f10a46cfSJingoo Han static int kb3886bl_suspend(struct device *dev)
103d03ebb12SClaudio Nieder {
104f10a46cfSJingoo Han struct backlight_device *bd = dev_get_drvdata(dev);
105d03ebb12SClaudio Nieder
106d03ebb12SClaudio Nieder kb3886bl_flags |= KB3886BL_SUSPENDED;
107d03ebb12SClaudio Nieder backlight_update_status(bd);
108d03ebb12SClaudio Nieder return 0;
109d03ebb12SClaudio Nieder }
110d03ebb12SClaudio Nieder
kb3886bl_resume(struct device * dev)111f10a46cfSJingoo Han static int kb3886bl_resume(struct device *dev)
112d03ebb12SClaudio Nieder {
113f10a46cfSJingoo Han struct backlight_device *bd = dev_get_drvdata(dev);
114d03ebb12SClaudio Nieder
115d03ebb12SClaudio Nieder kb3886bl_flags &= ~KB3886BL_SUSPENDED;
116d03ebb12SClaudio Nieder backlight_update_status(bd);
117d03ebb12SClaudio Nieder return 0;
118d03ebb12SClaudio Nieder }
119d03ebb12SClaudio Nieder #endif
120d03ebb12SClaudio Nieder
121f10a46cfSJingoo Han static SIMPLE_DEV_PM_OPS(kb3886bl_pm_ops, kb3886bl_suspend, kb3886bl_resume);
122f10a46cfSJingoo Han
kb3886bl_get_intensity(struct backlight_device * bd)123d03ebb12SClaudio Nieder static int kb3886bl_get_intensity(struct backlight_device *bd)
124d03ebb12SClaudio Nieder {
125d03ebb12SClaudio Nieder return kb3886bl_intensity;
126d03ebb12SClaudio Nieder }
127d03ebb12SClaudio Nieder
1289905a43bSEmese Revfy static const struct backlight_ops kb3886bl_ops = {
129d03ebb12SClaudio Nieder .get_brightness = kb3886bl_get_intensity,
130d03ebb12SClaudio Nieder .update_status = kb3886bl_send_intensity,
131d03ebb12SClaudio Nieder };
132d03ebb12SClaudio Nieder
kb3886bl_probe(struct platform_device * pdev)133d03ebb12SClaudio Nieder static int kb3886bl_probe(struct platform_device *pdev)
134d03ebb12SClaudio Nieder {
135a19a6ee6SMatthew Garrett struct backlight_properties props;
136c512794cSJingoo Han struct kb3886bl_machinfo *machinfo = dev_get_platdata(&pdev->dev);
137d03ebb12SClaudio Nieder
138d03ebb12SClaudio Nieder bl_machinfo = machinfo;
139d03ebb12SClaudio Nieder if (!machinfo->limit_mask)
140d03ebb12SClaudio Nieder machinfo->limit_mask = -1;
141d03ebb12SClaudio Nieder
142a19a6ee6SMatthew Garrett memset(&props, 0, sizeof(struct backlight_properties));
143bb7ca747SMatthew Garrett props.type = BACKLIGHT_RAW;
144a19a6ee6SMatthew Garrett props.max_brightness = machinfo->max_intensity;
145da653785SJingoo Han kb3886_backlight_device = devm_backlight_device_register(&pdev->dev,
146da653785SJingoo Han "kb3886-bl", &pdev->dev,
147da653785SJingoo Han NULL, &kb3886bl_ops,
148a19a6ee6SMatthew Garrett &props);
149d03ebb12SClaudio Nieder if (IS_ERR(kb3886_backlight_device))
150d03ebb12SClaudio Nieder return PTR_ERR(kb3886_backlight_device);
151d03ebb12SClaudio Nieder
152d03ebb12SClaudio Nieder platform_set_drvdata(pdev, kb3886_backlight_device);
153d03ebb12SClaudio Nieder
154d03ebb12SClaudio Nieder kb3886_backlight_device->props.power = FB_BLANK_UNBLANK;
155d03ebb12SClaudio Nieder kb3886_backlight_device->props.brightness = machinfo->default_intensity;
156d03ebb12SClaudio Nieder backlight_update_status(kb3886_backlight_device);
157d03ebb12SClaudio Nieder
158d03ebb12SClaudio Nieder return 0;
159d03ebb12SClaudio Nieder }
160d03ebb12SClaudio Nieder
161d03ebb12SClaudio Nieder static struct platform_driver kb3886bl_driver = {
162d03ebb12SClaudio Nieder .probe = kb3886bl_probe,
163d03ebb12SClaudio Nieder .driver = {
164d03ebb12SClaudio Nieder .name = "kb3886-bl",
165f10a46cfSJingoo Han .pm = &kb3886bl_pm_ops,
166d03ebb12SClaudio Nieder },
167d03ebb12SClaudio Nieder };
168d03ebb12SClaudio Nieder
kb3886_init(void)169d03ebb12SClaudio Nieder static int __init kb3886_init(void)
170d03ebb12SClaudio Nieder {
171d03ebb12SClaudio Nieder if (!dmi_check_system(kb3886bl_device_table))
172d03ebb12SClaudio Nieder return -ENODEV;
173d03ebb12SClaudio Nieder
174d03ebb12SClaudio Nieder platform_add_devices(devices, ARRAY_SIZE(devices));
175d03ebb12SClaudio Nieder return platform_driver_register(&kb3886bl_driver);
176d03ebb12SClaudio Nieder }
177d03ebb12SClaudio Nieder
kb3886_exit(void)178d03ebb12SClaudio Nieder static void __exit kb3886_exit(void)
179d03ebb12SClaudio Nieder {
180d03ebb12SClaudio Nieder platform_driver_unregister(&kb3886bl_driver);
181d03ebb12SClaudio Nieder }
182d03ebb12SClaudio Nieder
183d03ebb12SClaudio Nieder module_init(kb3886_init);
184d03ebb12SClaudio Nieder module_exit(kb3886_exit);
185d03ebb12SClaudio Nieder
186d03ebb12SClaudio Nieder MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>");
187d03ebb12SClaudio Nieder MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver");
188d03ebb12SClaudio Nieder MODULE_LICENSE("GPL");
189d03ebb12SClaudio Nieder MODULE_ALIAS("dmi:*:svnSDV:pniTouchT201:*");
190