| /* |
| * 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 <linux/slab.h> |
| #include <linux/platform_data/omap1_bl.h> |
| |
| #include <mach/hardware.h> |
| #include <mach/mux.h> |
| |
| #define OMAPBL_MAX_INTENSITY 0xff |
| |
| struct omap_backlight { |
| int powermode; |
| int current_intensity; |
| |
| struct device *dev; |
| struct omap_backlight_config *pdata; |
| }; |
| |
| static inline void omapbl_send_intensity(int intensity) |
| { |
| omap_writeb(intensity, OMAP_PWL_ENABLE); |
| } |
| |
| static inline void 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 = bl_get_data(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 = bl_get_data(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 = bl_get_data(dev); |
| |
| omapbl_blank(bl, state); |
| bl->powermode = state; |
| |
| return 0; |
| } |
| |
| static int omapbl_update_status(struct backlight_device *dev) |
| { |
| struct omap_backlight *bl = bl_get_data(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 = bl_get_data(dev); |
| return bl->current_intensity; |
| } |
| |
| static const 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_properties props; |
| struct backlight_device *dev; |
| struct omap_backlight *bl; |
| struct omap_backlight_config *pdata = pdev->dev.platform_data; |
| |
| if (!pdata) |
| return -ENXIO; |
| |
| bl = devm_kzalloc(&pdev->dev, sizeof(struct omap_backlight), |
| GFP_KERNEL); |
| if (unlikely(!bl)) |
| return -ENOMEM; |
| |
| memset(&props, 0, sizeof(struct backlight_properties)); |
| props.type = BACKLIGHT_RAW; |
| props.max_brightness = OMAPBL_MAX_INTENSITY; |
| dev = backlight_device_register("omap-bl", &pdev->dev, bl, &omapbl_ops, |
| &props); |
| if (IS_ERR(dev)) |
| 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.brightness = pdata->default_intensity; |
| omapbl_update_status(dev); |
| |
| dev_info(&pdev->dev, "OMAP LCD backlight initialised\n"); |
| |
| return 0; |
| } |
| |
| static int omapbl_remove(struct platform_device *pdev) |
| { |
| struct backlight_device *dev = platform_get_drvdata(pdev); |
| |
| backlight_device_unregister(dev); |
| |
| return 0; |
| } |
| |
| static struct platform_driver omapbl_driver = { |
| .probe = omapbl_probe, |
| .remove = omapbl_remove, |
| .suspend = omapbl_suspend, |
| .resume = omapbl_resume, |
| .driver = { |
| .name = "omap-bl", |
| }, |
| }; |
| |
| module_platform_driver(omapbl_driver); |
| |
| MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>"); |
| MODULE_DESCRIPTION("OMAP LCD Backlight driver"); |
| MODULE_LICENSE("GPL"); |