diff options
Diffstat (limited to 'drivers/video/backlight/omap1_bl.c')
| -rw-r--r-- | drivers/video/backlight/omap1_bl.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/video/backlight/omap1_bl.c b/drivers/video/backlight/omap1_bl.c new file mode 100644 index 0000000..891875d --- /dev/null +++ b/drivers/video/backlight/omap1_bl.c @@ -0,0 +1,210 @@ +/* + * Backlight driver for OMAP based boards. + * + * Copyright (c) 2006 Andrzej Zaborowski <balrog@zabor.org> + * + * This package is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This package is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this package; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/fb.h> +#include <linux/backlight.h> + +#include <asm/arch/hardware.h> +#include <asm/arch/board.h> +#include <asm/arch/mux.h> + +#define OMAPBL_MAX_INTENSITY 0xff + +struct omap_backlight { + int powermode; + int current_intensity; + + struct device *dev; + struct omap_backlight_config *pdata; +}; + +static void inline omapbl_send_intensity(int intensity) +{ + omap_writeb(intensity, OMAP_PWL_ENABLE); +} + +static void inline omapbl_send_enable(int enable) +{ + omap_writeb(enable, OMAP_PWL_CLK_ENABLE); +} + +static void omapbl_blank(struct omap_backlight *bl, int mode) +{ + if (bl->pdata->set_power) + bl->pdata->set_power(bl->dev, mode); + + switch (mode) { + case FB_BLANK_NORMAL: + case FB_BLANK_VSYNC_SUSPEND: + case FB_BLANK_HSYNC_SUSPEND: + case FB_BLANK_POWERDOWN: + omapbl_send_intensity(0); + omapbl_send_enable(0); + break; + + case FB_BLANK_UNBLANK: + omapbl_send_intensity(bl->current_intensity); + omapbl_send_enable(1); + break; + } +} + +#ifdef CONFIG_PM +static int omapbl_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct backlight_device *dev = platform_get_drvdata(pdev); + struct omap_backlight *bl = dev_get_drvdata(&dev->dev); + + omapbl_blank(bl, FB_BLANK_POWERDOWN); + return 0; +} + +static int omapbl_resume(struct platform_device *pdev) +{ + struct backlight_device *dev = platform_get_drvdata(pdev); + struct omap_backlight *bl = dev_get_drvdata(&dev->dev); + + omapbl_blank(bl, bl->powermode); + return 0; +} +#else +#define omapbl_suspend NULL +#define omapbl_resume NULL +#endif + +static int omapbl_set_power(struct backlight_device *dev, int state) +{ + struct omap_backlight *bl = dev_get_drvdata(&dev->dev); + + omapbl_blank(bl, state); + bl->powermode = state; + + return 0; +} + +static int omapbl_update_status(struct backlight_device *dev) +{ + struct omap_backlight *bl = dev_get_drvdata(&dev->dev); + + if (bl->current_intensity != dev->props.brightness) { + if (bl->powermode == FB_BLANK_UNBLANK) + omapbl_send_intensity(dev->props.brightness); + bl->current_intensity = dev->props.brightness; + } + + if (dev->props.fb_blank != bl->powermode) + omapbl_set_power(dev, dev->props.fb_blank); + + return 0; +} + +static int omapbl_get_intensity(struct backlight_device *dev) +{ + struct omap_backlight *bl = dev_get_drvdata(&dev->dev); + return bl->current_intensity; +} + +static struct backlight_ops omapbl_ops = { + .get_brightness = omapbl_get_intensity, + .update_status = omapbl_update_status, +}; + +static int omapbl_probe(struct platform_device *pdev) +{ + struct backlight_device *dev; + struct omap_backlight *bl; + struct omap_backlight_config *pdata = pdev->dev.platform_data; + + if (!pdata) + return -ENXIO; + + omapbl_ops.check_fb = pdata->check_fb; + + bl = kzalloc(sizeof(struct omap_backlight), GFP_KERNEL); + if (unlikely(!bl)) + return -ENOMEM; + + dev = backlight_device_register("omap-bl", &pdev->dev, bl, &omapbl_ops); + if (IS_ERR(dev)) { + kfree(bl); + return PTR_ERR(dev); + } + + bl->powermode = FB_BLANK_POWERDOWN; + bl->current_intensity = 0; + + bl->pdata = pdata; + bl->dev = &pdev->dev; + + platform_set_drvdata(pdev, dev); + + omap_cfg_reg(PWL); /* Conflicts with UART3 */ + + dev->props.fb_blank = FB_BLANK_UNBLANK; + dev->props.max_brightness = OMAPBL_MAX_INTENSITY; + dev->props.brightness = pdata->default_intensity; + omapbl_update_status(dev); + + printk(KERN_INFO "OMAP LCD backlight initialised\n"); + + return 0; +} + +static int omapbl_remove(struct platform_device *pdev) +{ + struct backlight_device *dev = platform_get_drvdata(pdev); + struct omap_backlight *bl = dev_get_drvdata(&dev->dev); + + backlight_device_unregister(dev); + kfree(bl); + + return 0; +} + +static struct platform_driver omapbl_driver = { + .probe = omapbl_probe, + .remove = omapbl_remove, + .suspend = omapbl_suspend, + .resume = omapbl_resume, + .driver = { + .name = "omap-bl", + }, +}; + +static int __init omapbl_init(void) +{ + return platform_driver_register(&omapbl_driver); +} + +static void __exit omapbl_exit(void) +{ + platform_driver_unregister(&omapbl_driver); +} + +module_init(omapbl_init); +module_exit(omapbl_exit); + +MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>"); +MODULE_DESCRIPTION("OMAP LCD Backlight driver"); +MODULE_LICENSE("GPL"); |
