/* * 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); msleep(10); outb(KB3886_PWM0_WRITE, KB3886_IO); msleep(10); 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 struct dmi_system_id __initdata kb3886bl_device_table[] = { { .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 static int kb3886bl_suspend(struct platform_device *pdev, pm_message_t state) { struct backlight_device *bd = platform_get_drvdata(pdev); kb3886bl_flags |= KB3886BL_SUSPENDED; backlight_update_status(bd); return 0; } static int kb3886bl_resume(struct platform_device *pdev) { struct backlight_device *bd = platform_get_drvdata(pdev); kb3886bl_flags &= ~KB3886BL_SUSPENDED; backlight_update_status(bd); return 0; } #else #define kb3886bl_suspend NULL #define kb3886bl_resume NULL #endif 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 kb3886bl_machinfo *machinfo = pdev->dev.platform_data; bl_machinfo = machinfo; if (!machinfo->limit_mask) machinfo->limit_mask = -1; kb3886_backlight_device = backlight_device_register("kb3886-bl", &pdev->dev, NULL, &kb3886bl_ops); if (IS_ERR(kb3886_backlight_device)) return PTR_ERR(kb3886_backlight_device); platform_set_drvdata(pdev, kb3886_backlight_device); kb3886_backlight_device->props.max_brightness = machinfo->max_intensity; 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 int kb3886bl_remove(struct platform_device *pdev) { struct backlight_device *bd = platform_get_drvdata(pdev); backlight_device_unregister(bd); return 0; } static struct platform_driver kb3886bl_driver = { .probe = kb3886bl_probe, .remove = kb3886bl_remove, .suspend = kb3886bl_suspend, .resume = kb3886bl_resume, .driver = { .name = "kb3886-bl", }, }; 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:*");