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189 lines
4.4 KiB
189 lines
4.4 KiB
// 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 <[email protected]>"); |
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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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