172 lines
4.1 KiB
C
172 lines
4.1 KiB
C
/*
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* Backlight Driver for Sharp Zaurus Handhelds (various models)
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*
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* Copyright (c) 2004-2006 Richard Purdie
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*
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* Based on Sharp's 2.4 Backlight Driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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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 <asm/arch/sharpsl.h>
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#include <asm/hardware/sharpsl_pm.h>
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static int corgibl_intensity;
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static struct backlight_properties corgibl_data;
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static struct backlight_device *corgi_backlight_device;
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static struct corgibl_machinfo *bl_machinfo;
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static unsigned long corgibl_flags;
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#define CORGIBL_SUSPENDED 0x01
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#define CORGIBL_BATTLOW 0x02
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static int corgibl_send_intensity(struct backlight_device *bd)
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{
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void (*corgi_kick_batt)(void);
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int intensity = bd->props.brightness;
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if (bd->props.power != FB_BLANK_UNBLANK)
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intensity = 0;
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if (bd->props.fb_blank != FB_BLANK_UNBLANK)
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intensity = 0;
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if (corgibl_flags & CORGIBL_SUSPENDED)
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intensity = 0;
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if (corgibl_flags & CORGIBL_BATTLOW)
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intensity &= bl_machinfo->limit_mask;
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bl_machinfo->set_bl_intensity(intensity);
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corgibl_intensity = intensity;
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corgi_kick_batt = symbol_get(sharpsl_battery_kick);
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if (corgi_kick_batt) {
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corgi_kick_batt();
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symbol_put(sharpsl_battery_kick);
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}
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return 0;
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}
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#ifdef CONFIG_PM
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static int corgibl_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct backlight_device *bd = platform_get_drvdata(pdev);
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corgibl_flags |= CORGIBL_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 corgibl_resume(struct platform_device *pdev)
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{
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struct backlight_device *bd = platform_get_drvdata(pdev);
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corgibl_flags &= ~CORGIBL_SUSPENDED;
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backlight_update_status(bd);
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return 0;
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}
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#else
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#define corgibl_suspend NULL
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#define corgibl_resume NULL
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#endif
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static int corgibl_get_intensity(struct backlight_device *bd)
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{
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return corgibl_intensity;
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}
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/*
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* Called when the battery is low to limit the backlight intensity.
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* If limit==0 clear any limit, otherwise limit the intensity
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*/
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void corgibl_limit_intensity(int limit)
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{
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if (limit)
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corgibl_flags |= CORGIBL_BATTLOW;
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else
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corgibl_flags &= ~CORGIBL_BATTLOW;
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backlight_update_status(corgi_backlight_device);
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}
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EXPORT_SYMBOL(corgibl_limit_intensity);
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static struct backlight_ops corgibl_ops = {
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.get_brightness = corgibl_get_intensity,
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.update_status = corgibl_send_intensity,
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};
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static int corgibl_probe(struct platform_device *pdev)
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{
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struct corgibl_machinfo *machinfo = pdev->dev.platform_data;
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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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corgi_backlight_device = backlight_device_register ("corgi-bl",
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&pdev->dev, NULL, &corgibl_ops);
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if (IS_ERR (corgi_backlight_device))
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return PTR_ERR (corgi_backlight_device);
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platform_set_drvdata(pdev, corgi_backlight_device);
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corgi_backlight_device->props.max_brightness = machinfo->max_intensity;
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corgi_backlight_device->props.power = FB_BLANK_UNBLANK;
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corgi_backlight_device->props.brightness = machinfo->default_intensity;
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backlight_update_status(corgi_backlight_device);
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printk("Corgi Backlight Driver Initialized.\n");
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return 0;
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}
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static int corgibl_remove(struct platform_device *pdev)
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{
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struct backlight_device *bd = platform_get_drvdata(pdev);
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corgibl_data.power = 0;
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corgibl_data.brightness = 0;
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backlight_update_status(bd);
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backlight_device_unregister(bd);
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printk("Corgi Backlight Driver Unloaded\n");
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return 0;
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}
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static struct platform_driver corgibl_driver = {
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.probe = corgibl_probe,
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.remove = corgibl_remove,
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.suspend = corgibl_suspend,
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.resume = corgibl_resume,
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.driver = {
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.name = "corgi-bl",
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},
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};
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static int __init corgibl_init(void)
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{
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return platform_driver_register(&corgibl_driver);
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}
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static void __exit corgibl_exit(void)
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{
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platform_driver_unregister(&corgibl_driver);
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}
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module_init(corgibl_init);
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module_exit(corgibl_exit);
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MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
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MODULE_DESCRIPTION("Corgi Backlight Driver");
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MODULE_LICENSE("GPL");
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