2c0f5fb08e
Generalise the Corgi backlight driver by moving the default intensity and limit mask settings into the platform specific data structure. This enables the driver to support other Zaurus hardware, specifically the SL-6000x (Tosa) model. Also change the spinlock to a mutex (the spinlock is overkill). Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
170 lines
4.1 KiB
C
170 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 DEFINE_MUTEX(bl_mutex);
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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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mutex_lock(&bl_mutex);
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bl_machinfo->set_bl_intensity(intensity);
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mutex_unlock(&bl_mutex);
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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 *dev, pm_message_t state)
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{
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corgibl_flags |= CORGIBL_SUSPENDED;
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corgibl_send_intensity(corgi_backlight_device);
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return 0;
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}
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static int corgibl_resume(struct platform_device *dev)
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{
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corgibl_flags &= ~CORGIBL_SUSPENDED;
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corgibl_send_intensity(corgi_backlight_device);
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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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static int corgibl_set_intensity(struct backlight_device *bd)
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{
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corgibl_send_intensity(corgi_backlight_device);
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return 0;
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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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corgibl_send_intensity(corgi_backlight_device);
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}
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EXPORT_SYMBOL(corgibl_limit_intensity);
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static struct backlight_properties corgibl_data = {
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.owner = THIS_MODULE,
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.get_brightness = corgibl_get_intensity,
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.update_status = corgibl_set_intensity,
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};
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static int __init 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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corgibl_data.max_brightness = machinfo->max_intensity;
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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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NULL, &corgibl_data);
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if (IS_ERR (corgi_backlight_device))
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return PTR_ERR (corgi_backlight_device);
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corgibl_data.power = FB_BLANK_UNBLANK;
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corgibl_data.brightness = machinfo->default_intensity;
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corgibl_send_intensity(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 *dev)
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{
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backlight_device_unregister(corgi_backlight_device);
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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("GPLv2");
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