v4.19.13 snapshot.
diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
new file mode 100644
index 0000000..96312c3
--- /dev/null
+++ b/drivers/video/backlight/kb3886_bl.c
@@ -0,0 +1,197 @@
+/*
+ * Backlight Driver for the KB3886 Backlight
+ *
+ * Copyright (c) 2007-2008 Claudio Nieder
+ *
+ * Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/dmi.h>
+
+#define KB3886_PARENT 0x64
+#define KB3886_IO 0x60
+#define KB3886_ADC_DAC_PWM 0xC4
+#define KB3886_PWM0_WRITE 0x81
+#define KB3886_PWM0_READ 0x41
+
+static DEFINE_MUTEX(bl_mutex);
+
+static void kb3886_bl_set_intensity(int intensity)
+{
+ mutex_lock(&bl_mutex);
+ intensity = intensity&0xff;
+ outb(KB3886_ADC_DAC_PWM, KB3886_PARENT);
+ usleep_range(10000, 11000);
+ outb(KB3886_PWM0_WRITE, KB3886_IO);
+ usleep_range(10000, 11000);
+ outb(intensity, KB3886_IO);
+ mutex_unlock(&bl_mutex);
+}
+
+struct kb3886bl_machinfo {
+ int max_intensity;
+ int default_intensity;
+ int limit_mask;
+ void (*set_bl_intensity)(int intensity);
+};
+
+static struct kb3886bl_machinfo kb3886_bl_machinfo = {
+ .max_intensity = 0xff,
+ .default_intensity = 0xa0,
+ .limit_mask = 0x7f,
+ .set_bl_intensity = kb3886_bl_set_intensity,
+};
+
+static struct platform_device kb3886bl_device = {
+ .name = "kb3886-bl",
+ .dev = {
+ .platform_data = &kb3886_bl_machinfo,
+ },
+ .id = -1,
+};
+
+static struct platform_device *devices[] __initdata = {
+ &kb3886bl_device,
+};
+
+/*
+ * Back to driver
+ */
+
+static int kb3886bl_intensity;
+static struct backlight_device *kb3886_backlight_device;
+static struct kb3886bl_machinfo *bl_machinfo;
+
+static unsigned long kb3886bl_flags;
+#define KB3886BL_SUSPENDED 0x01
+
+static const struct dmi_system_id kb3886bl_device_table[] __initconst = {
+ {
+ .ident = "Sahara Touch-iT",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SDV"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "iTouch T201"),
+ },
+ },
+ { }
+};
+
+static int kb3886bl_send_intensity(struct backlight_device *bd)
+{
+ int intensity = bd->props.brightness;
+
+ if (bd->props.power != FB_BLANK_UNBLANK)
+ intensity = 0;
+ if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+ intensity = 0;
+ if (kb3886bl_flags & KB3886BL_SUSPENDED)
+ intensity = 0;
+
+ bl_machinfo->set_bl_intensity(intensity);
+
+ kb3886bl_intensity = intensity;
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int kb3886bl_suspend(struct device *dev)
+{
+ struct backlight_device *bd = dev_get_drvdata(dev);
+
+ kb3886bl_flags |= KB3886BL_SUSPENDED;
+ backlight_update_status(bd);
+ return 0;
+}
+
+static int kb3886bl_resume(struct device *dev)
+{
+ struct backlight_device *bd = dev_get_drvdata(dev);
+
+ kb3886bl_flags &= ~KB3886BL_SUSPENDED;
+ backlight_update_status(bd);
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(kb3886bl_pm_ops, kb3886bl_suspend, kb3886bl_resume);
+
+static int kb3886bl_get_intensity(struct backlight_device *bd)
+{
+ return kb3886bl_intensity;
+}
+
+static const struct backlight_ops kb3886bl_ops = {
+ .get_brightness = kb3886bl_get_intensity,
+ .update_status = kb3886bl_send_intensity,
+};
+
+static int kb3886bl_probe(struct platform_device *pdev)
+{
+ struct backlight_properties props;
+ struct kb3886bl_machinfo *machinfo = dev_get_platdata(&pdev->dev);
+
+ bl_machinfo = machinfo;
+ if (!machinfo->limit_mask)
+ machinfo->limit_mask = -1;
+
+ memset(&props, 0, sizeof(struct backlight_properties));
+ props.type = BACKLIGHT_RAW;
+ props.max_brightness = machinfo->max_intensity;
+ kb3886_backlight_device = devm_backlight_device_register(&pdev->dev,
+ "kb3886-bl", &pdev->dev,
+ NULL, &kb3886bl_ops,
+ &props);
+ if (IS_ERR(kb3886_backlight_device))
+ return PTR_ERR(kb3886_backlight_device);
+
+ platform_set_drvdata(pdev, kb3886_backlight_device);
+
+ kb3886_backlight_device->props.power = FB_BLANK_UNBLANK;
+ kb3886_backlight_device->props.brightness = machinfo->default_intensity;
+ backlight_update_status(kb3886_backlight_device);
+
+ return 0;
+}
+
+static struct platform_driver kb3886bl_driver = {
+ .probe = kb3886bl_probe,
+ .driver = {
+ .name = "kb3886-bl",
+ .pm = &kb3886bl_pm_ops,
+ },
+};
+
+static int __init kb3886_init(void)
+{
+ if (!dmi_check_system(kb3886bl_device_table))
+ return -ENODEV;
+
+ platform_add_devices(devices, ARRAY_SIZE(devices));
+ return platform_driver_register(&kb3886bl_driver);
+}
+
+static void __exit kb3886_exit(void)
+{
+ platform_driver_unregister(&kb3886bl_driver);
+}
+
+module_init(kb3886_init);
+module_exit(kb3886_exit);
+
+MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>");
+MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("dmi:*:svnSDV:pniTouchT201:*");