forked from Minki/linux
Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight
* 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight: backlight: Add OMAP1 PWL backlight driver backlight: Avoid unecessary driver callbacks
This commit is contained in:
Linus Torvalds
commit
4383f18b7f
@ -80,6 +80,15 @@ config BACKLIGHT_LOCOMO
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If you have a Sharp Zaurus SL-5500 (Collie) or SL-5600 (Poodle) say y to
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enable the LCD/backlight driver.
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config BACKLIGHT_OMAP1
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tristate "OMAP1 PWL-based LCD Backlight"
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depends on BACKLIGHT_CLASS_DEVICE && ARCH_OMAP1
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default y
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help
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This driver controls the LCD backlight level and power for
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the PWL module of OMAP1 processors. Say Y if your board
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uses this hardware.
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config BACKLIGHT_HP680
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tristate "HP Jornada 680 Backlight Driver"
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depends on BACKLIGHT_CLASS_DEVICE && SH_HP6XX
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@ -7,5 +7,6 @@ obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
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obj-$(CONFIG_BACKLIGHT_CORGI) += corgi_bl.o
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obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
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obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
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obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
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obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
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obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
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@ -94,8 +94,10 @@ static ssize_t backlight_store_power(struct device *dev,
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mutex_lock(&bd->ops_lock);
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if (bd->ops) {
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pr_debug("backlight: set power to %d\n", power);
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bd->props.power = power;
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backlight_update_status(bd);
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if (bd->props.power != power) {
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bd->props.power = power;
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backlight_update_status(bd);
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}
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rc = count;
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}
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mutex_unlock(&bd->ops_lock);
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@ -132,8 +134,10 @@ static ssize_t backlight_store_brightness(struct device *dev,
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else {
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pr_debug("backlight: set brightness to %d\n",
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brightness);
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bd->props.brightness = brightness;
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backlight_update_status(bd);
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if (bd->props.brightness != brightness) {
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bd->props.brightness = brightness;
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backlight_update_status(bd);
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}
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rc = count;
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}
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}
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210
drivers/video/backlight/omap1_bl.c
Normal file
210
drivers/video/backlight/omap1_bl.c
Normal file
@ -0,0 +1,210 @@
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/*
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* Backlight driver for OMAP based boards.
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*
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* Copyright (c) 2006 Andrzej Zaborowski <balrog@zabor.org>
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*
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* This package is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This package is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this package; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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/fb.h>
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#include <linux/backlight.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/board.h>
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#include <asm/arch/mux.h>
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#define OMAPBL_MAX_INTENSITY 0xff
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struct omap_backlight {
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int powermode;
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int current_intensity;
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struct device *dev;
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struct omap_backlight_config *pdata;
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};
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static void inline omapbl_send_intensity(int intensity)
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{
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omap_writeb(intensity, OMAP_PWL_ENABLE);
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}
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static void inline omapbl_send_enable(int enable)
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{
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omap_writeb(enable, OMAP_PWL_CLK_ENABLE);
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}
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static void omapbl_blank(struct omap_backlight *bl, int mode)
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{
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if (bl->pdata->set_power)
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bl->pdata->set_power(bl->dev, mode);
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switch (mode) {
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case FB_BLANK_NORMAL:
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case FB_BLANK_VSYNC_SUSPEND:
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case FB_BLANK_HSYNC_SUSPEND:
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case FB_BLANK_POWERDOWN:
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omapbl_send_intensity(0);
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omapbl_send_enable(0);
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break;
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case FB_BLANK_UNBLANK:
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omapbl_send_intensity(bl->current_intensity);
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omapbl_send_enable(1);
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break;
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}
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}
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#ifdef CONFIG_PM
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static int omapbl_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct backlight_device *dev = platform_get_drvdata(pdev);
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struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
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omapbl_blank(bl, FB_BLANK_POWERDOWN);
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return 0;
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}
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static int omapbl_resume(struct platform_device *pdev)
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{
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struct backlight_device *dev = platform_get_drvdata(pdev);
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struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
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omapbl_blank(bl, bl->powermode);
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return 0;
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}
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#else
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#define omapbl_suspend NULL
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#define omapbl_resume NULL
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#endif
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static int omapbl_set_power(struct backlight_device *dev, int state)
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{
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struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
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omapbl_blank(bl, state);
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bl->powermode = state;
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return 0;
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}
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static int omapbl_update_status(struct backlight_device *dev)
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{
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struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
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if (bl->current_intensity != dev->props.brightness) {
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if (bl->powermode == FB_BLANK_UNBLANK)
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omapbl_send_intensity(dev->props.brightness);
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bl->current_intensity = dev->props.brightness;
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}
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if (dev->props.fb_blank != bl->powermode)
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omapbl_set_power(dev, dev->props.fb_blank);
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return 0;
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}
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static int omapbl_get_intensity(struct backlight_device *dev)
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{
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struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
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return bl->current_intensity;
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}
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static struct backlight_ops omapbl_ops = {
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.get_brightness = omapbl_get_intensity,
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.update_status = omapbl_update_status,
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};
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static int omapbl_probe(struct platform_device *pdev)
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{
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struct backlight_device *dev;
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struct omap_backlight *bl;
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struct omap_backlight_config *pdata = pdev->dev.platform_data;
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if (!pdata)
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return -ENXIO;
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omapbl_ops.check_fb = pdata->check_fb;
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bl = kzalloc(sizeof(struct omap_backlight), GFP_KERNEL);
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if (unlikely(!bl))
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return -ENOMEM;
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dev = backlight_device_register("omap-bl", &pdev->dev, bl, &omapbl_ops);
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if (IS_ERR(dev)) {
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kfree(bl);
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return PTR_ERR(dev);
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}
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bl->powermode = FB_BLANK_POWERDOWN;
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bl->current_intensity = 0;
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bl->pdata = pdata;
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bl->dev = &pdev->dev;
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platform_set_drvdata(pdev, dev);
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omap_cfg_reg(PWL); /* Conflicts with UART3 */
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dev->props.fb_blank = FB_BLANK_UNBLANK;
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dev->props.max_brightness = OMAPBL_MAX_INTENSITY;
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dev->props.brightness = pdata->default_intensity;
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omapbl_update_status(dev);
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printk(KERN_INFO "OMAP LCD backlight initialised\n");
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return 0;
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}
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static int omapbl_remove(struct platform_device *pdev)
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{
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struct backlight_device *dev = platform_get_drvdata(pdev);
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struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
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backlight_device_unregister(dev);
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kfree(bl);
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return 0;
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}
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static struct platform_driver omapbl_driver = {
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.probe = omapbl_probe,
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.remove = omapbl_remove,
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.suspend = omapbl_suspend,
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.resume = omapbl_resume,
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.driver = {
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.name = "omap-bl",
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},
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};
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static int __init omapbl_init(void)
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{
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return platform_driver_register(&omapbl_driver);
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}
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static void __exit omapbl_exit(void)
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{
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platform_driver_unregister(&omapbl_driver);
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}
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module_init(omapbl_init);
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module_exit(omapbl_exit);
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MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>");
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MODULE_DESCRIPTION("OMAP LCD Backlight driver");
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MODULE_LICENSE("GPL");
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