190 lines
4.4 KiB
C
190 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Backlight Driver for the KB3886 Backlight
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*
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* Copyright (c) 2007-2008 Claudio Nieder
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*
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* Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <linux/delay.h>
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#include <linux/dmi.h>
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#define KB3886_PARENT 0x64
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#define KB3886_IO 0x60
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#define KB3886_ADC_DAC_PWM 0xC4
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#define KB3886_PWM0_WRITE 0x81
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#define KB3886_PWM0_READ 0x41
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static DEFINE_MUTEX(bl_mutex);
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static void kb3886_bl_set_intensity(int intensity)
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{
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mutex_lock(&bl_mutex);
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intensity = intensity&0xff;
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outb(KB3886_ADC_DAC_PWM, KB3886_PARENT);
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usleep_range(10000, 11000);
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outb(KB3886_PWM0_WRITE, KB3886_IO);
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usleep_range(10000, 11000);
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outb(intensity, KB3886_IO);
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mutex_unlock(&bl_mutex);
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}
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struct kb3886bl_machinfo {
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int max_intensity;
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int default_intensity;
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int limit_mask;
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void (*set_bl_intensity)(int intensity);
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};
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static struct kb3886bl_machinfo kb3886_bl_machinfo = {
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.max_intensity = 0xff,
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.default_intensity = 0xa0,
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.limit_mask = 0x7f,
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.set_bl_intensity = kb3886_bl_set_intensity,
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};
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static struct platform_device kb3886bl_device = {
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.name = "kb3886-bl",
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.dev = {
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.platform_data = &kb3886_bl_machinfo,
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},
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.id = -1,
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};
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static struct platform_device *devices[] __initdata = {
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&kb3886bl_device,
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};
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/*
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* Back to driver
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*/
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static int kb3886bl_intensity;
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static struct backlight_device *kb3886_backlight_device;
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static struct kb3886bl_machinfo *bl_machinfo;
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static unsigned long kb3886bl_flags;
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#define KB3886BL_SUSPENDED 0x01
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static const struct dmi_system_id kb3886bl_device_table[] __initconst = {
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{
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.ident = "Sahara Touch-iT",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "SDV"),
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DMI_MATCH(DMI_PRODUCT_NAME, "iTouch T201"),
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},
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},
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{ }
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};
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static int kb3886bl_send_intensity(struct backlight_device *bd)
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{
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int intensity = backlight_get_brightness(bd);
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if (kb3886bl_flags & KB3886BL_SUSPENDED)
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intensity = 0;
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bl_machinfo->set_bl_intensity(intensity);
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kb3886bl_intensity = intensity;
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int kb3886bl_suspend(struct device *dev)
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{
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struct backlight_device *bd = dev_get_drvdata(dev);
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kb3886bl_flags |= KB3886BL_SUSPENDED;
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backlight_update_status(bd);
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return 0;
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}
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static int kb3886bl_resume(struct device *dev)
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{
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struct backlight_device *bd = dev_get_drvdata(dev);
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kb3886bl_flags &= ~KB3886BL_SUSPENDED;
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backlight_update_status(bd);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(kb3886bl_pm_ops, kb3886bl_suspend, kb3886bl_resume);
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static int kb3886bl_get_intensity(struct backlight_device *bd)
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{
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return kb3886bl_intensity;
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}
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static const struct backlight_ops kb3886bl_ops = {
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.get_brightness = kb3886bl_get_intensity,
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.update_status = kb3886bl_send_intensity,
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};
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static int kb3886bl_probe(struct platform_device *pdev)
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{
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struct backlight_properties props;
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struct kb3886bl_machinfo *machinfo = dev_get_platdata(&pdev->dev);
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bl_machinfo = machinfo;
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if (!machinfo->limit_mask)
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machinfo->limit_mask = -1;
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memset(&props, 0, sizeof(struct backlight_properties));
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props.type = BACKLIGHT_RAW;
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props.max_brightness = machinfo->max_intensity;
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kb3886_backlight_device = devm_backlight_device_register(&pdev->dev,
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"kb3886-bl", &pdev->dev,
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NULL, &kb3886bl_ops,
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&props);
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if (IS_ERR(kb3886_backlight_device))
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return PTR_ERR(kb3886_backlight_device);
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platform_set_drvdata(pdev, kb3886_backlight_device);
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kb3886_backlight_device->props.power = FB_BLANK_UNBLANK;
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kb3886_backlight_device->props.brightness = machinfo->default_intensity;
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backlight_update_status(kb3886_backlight_device);
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return 0;
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}
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static struct platform_driver kb3886bl_driver = {
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.probe = kb3886bl_probe,
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.driver = {
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.name = "kb3886-bl",
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.pm = &kb3886bl_pm_ops,
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},
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};
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static int __init kb3886_init(void)
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{
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if (!dmi_check_system(kb3886bl_device_table))
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return -ENODEV;
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platform_add_devices(devices, ARRAY_SIZE(devices));
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return platform_driver_register(&kb3886bl_driver);
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}
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static void __exit kb3886_exit(void)
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{
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platform_driver_unregister(&kb3886bl_driver);
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}
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module_init(kb3886_init);
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module_exit(kb3886_exit);
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MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>");
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MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("dmi:*:svnSDV:pniTouchT201:*");
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