This patch implements the backlight driver for OMAP3EVM. The mechanism for backlight control is reused from the existing controls in lcd_omap3evm.c.
Signed-off-by: Sanjeev Premi <[email protected]> --- drivers/video/backlight/Kconfig | 7 + drivers/video/backlight/Makefile | 1 + drivers/video/backlight/omap3evm_bl.c | 252 +++++++++++++++++++++++++++++++++ drivers/video/omap/Kconfig | 1 + drivers/video/omap/lcd_omap3evm.c | 25 ---- 5 files changed, 261 insertions(+), 25 deletions(-) create mode 100644 drivers/video/backlight/omap3evm_bl.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 4a4dd9a..2efa5d0 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -152,6 +152,13 @@ config BACKLIGHT_OMAP1 the PWL module of OMAP1 processors. Say Y if your board uses this hardware. +config BACKLIGHT_OMAP3EVM + tristate "OMAP3EVM LCD Backlight" + depends on BACKLIGHT_CLASS_DEVICE && MACH_OMAP3EVM + default y + help + This driver controls the LCD backlight for OMAP3EVM. + config BACKLIGHT_HP680 tristate "HP Jornada 680 Backlight Driver" depends on BACKLIGHT_CLASS_DEVICE && SH_HP6XX diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 103427d..0150953 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_BACKLIGHT_CORGI) += corgi_bl.o obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o +obj-$(CONFIG_BACKLIGHT_OMAP3EVM) += omap3evm_bl.o obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o diff --git a/drivers/video/backlight/omap3evm_bl.c b/drivers/video/backlight/omap3evm_bl.c new file mode 100644 index 0000000..a6dd3a1 --- /dev/null +++ b/drivers/video/backlight/omap3evm_bl.c @@ -0,0 +1,252 @@ +/* + * drivers/video/backlight/omap3evm_bl.c + * + * Backlight driver for OMAP3EVM + * + * Copyright (c) 2009, Texas Instruments Incorporated. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, + * whether express or implied; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#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/i2c/twl4030.h> + +#include <mach/omapfb.h> + +/** + * Name of the driver + */ +#define OMAPBL_DRVNAME "omap-backlight" + +/** + * Name of the device + */ +#define OMAPBL_DEVNAME "omap-backlight" + +/** + * Minimum intensity supported by the panel + */ +#define OMAPBL_MIN_INTENSITY 0 +/** + * Maximum intensity supported by the panel + */ +#define OMAPBL_MAX_INTENSITY 100 + +/** + * Default intensity after boot-up + */ +#define OMAPBL_DEF_INTENSITY 70 + +/** + * Flag indicating the driver status - suspended / running + */ +#define OMAPBL_SUSPENDED 0x01 + +/** + * Flag indicating low battery + */ +#define OMAPBL_BATTLOW 0x02 + +#define TWL_PWMA_PWMAON 0x00 +#define TWL_PWMA_PWMAOFF 0x01 + +/** + * Current backlight intensity + */ +static int panel_intensity; + +/** + * Backlight properties + */ +static struct backlight_properties omapbl_props; + +/** + * Generic backlight information + */ +static struct generic_bl_info *omapbl_info; + +/** + * Backlight device + */ +struct backlight_device *omapbl_device; + +/** + * Backlight flags + */ +static unsigned long omapbl_flags; + +static int omapbl_set_intensity(struct backlight_device *bd) +{ + int intensity = bd->props.brightness; + u8 c; + + if (bd->props.power != FB_BLANK_UNBLANK) + intensity = 0; + if (bd->props.fb_blank != FB_BLANK_UNBLANK) + intensity = 0; + if (omapbl_flags & OMAPBL_SUSPENDED) + intensity = 0; + if (omapbl_flags & OMAPBL_BATTLOW) + intensity &= omapbl_info->limit_mask; + + c = ((125 * (100 - intensity)) / 100) + 2; + + twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, c, TWL_PWMA_PWMAOFF); + + panel_intensity = intensity; + + return 0; +} + +static int omapbl_get_intensity(struct backlight_device *bd) +{ + return panel_intensity; +} + +/** + * omapbl_limit_intensity - Limit the backlight iuntensity + * @limit - Value 0 clears the limit. Else used as limit to be set. + * + * When the battery is low, this function is called to limit the backlight. + */ +void omapbl_limit_intensity(int limit) +{ + if (limit) + omapbl_flags |= OMAPBL_BATTLOW; + else + omapbl_flags &= ~OMAPBL_BATTLOW; + + backlight_update_status(omapbl_device); +} +EXPORT_SYMBOL(omapbl_limit_intensity); + +static struct backlight_ops omapbl_ops = { + .get_brightness = omapbl_get_intensity, + .update_status = omapbl_set_intensity, +}; + +static int omapbl_probe(struct platform_device *pdev) +{ + omapbl_device = backlight_device_register (OMAPBL_DRVNAME, + &pdev->dev, + NULL, + &omapbl_ops); + + if (IS_ERR (omapbl_device)) + return PTR_ERR (omapbl_device); + + platform_set_drvdata(pdev, omapbl_device); + + omapbl_device->props.power = FB_BLANK_UNBLANK; + omapbl_device->props.max_brightness = OMAPBL_MAX_INTENSITY; + omapbl_device->props.brightness = OMAPBL_DEF_INTENSITY; + + omapbl_set_intensity(omapbl_device); + + printk(KERN_INFO "omap-backlight: driver initialized.\n"); + + return 0; +} + +static int omapbl_remove(struct platform_device *pdev) +{ + struct backlight_device *bd = platform_get_drvdata(pdev); + + omapbl_props.power = 0; + omapbl_props.brightness = 0; + backlight_update_status(bd); + + backlight_device_unregister(bd); + + printk(KERN_INFO "omap-backlight: driver unloaded.\n"); + + return 0; +} + +#ifdef CONFIG_PM +static int omapbl_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct backlight_device *bd = platform_get_drvdata(pdev); + + printk(KERN_INFO "omap-backlight: suspending...\n"); + + omapbl_flags |= OMAPBL_SUSPENDED; + backlight_update_status(bd); + + return 0; +} + +static int omapbl_resume(struct platform_device *pdev) +{ + struct backlight_device *bd = platform_get_drvdata(pdev); + + printk(KERN_INFO "omap-backlight: resuming...\n"); + + omapbl_flags &= ~OMAPBL_SUSPENDED; + backlight_update_status(bd); + + return 0; +} +#else +#define omapbl_suspend NULL +#define omapbl_resume NULL +#endif + +static struct platform_driver omap_backlight_drv = { + .probe = omapbl_probe, + .remove = omapbl_remove, + .suspend = omapbl_suspend, + .resume = omapbl_resume, + .driver = { + .name = OMAPBL_DRVNAME, + }, +}; + +static struct platform_device *omap_backlight_dev; + +static int __init omapbl_init(void) +{ + int ret = platform_driver_register(&omap_backlight_drv); + + if (!ret) { + omap_backlight_dev = platform_device_alloc(OMAPBL_DEVNAME, -1); + + if (!omap_backlight_dev) + return -ENOMEM; + + ret = platform_device_add(omap_backlight_dev); + + if (ret) { + platform_device_put(omap_backlight_dev); + platform_driver_unregister(&omap_backlight_drv); + } + } + + return ret; +} + +static void __exit omapbl_exit(void) +{ + platform_device_unregister(omap_backlight_dev); + platform_driver_unregister(&omap_backlight_drv); +} + +module_init(omapbl_init); +module_exit(omapbl_exit); + +MODULE_AUTHOR("Sanjeev Premi <[email protected]>"); +MODULE_DESCRIPTION("OMAP LCD Backlight driver"); +MODULE_LICENSE("GPLv2"); + diff --git a/drivers/video/omap/Kconfig b/drivers/video/omap/Kconfig index c355b59..41ae018 100644 --- a/drivers/video/omap/Kconfig +++ b/drivers/video/omap/Kconfig @@ -4,6 +4,7 @@ config FB_OMAP select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT + select FB_BACKLIGHT help Frame buffer driver for OMAP based boards. diff --git a/drivers/video/omap/lcd_omap3evm.c b/drivers/video/omap/lcd_omap3evm.c index 1c3d814..079989f 100644 --- a/drivers/video/omap/lcd_omap3evm.c +++ b/drivers/video/omap/lcd_omap3evm.c @@ -94,28 +94,6 @@ static unsigned long omap3evm_panel_get_caps(struct lcd_panel *panel) return 0; } -static int omap3evm_bklight_setlevel(struct lcd_panel *panel, - unsigned int level) -{ - u8 c; - if ((level >= 0) && (level <= 100)) { - c = (125 * (100 - level)) / 100 + 2; - twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, c, TWL_PWMA_PWMAOFF); - bklight_level = level; - } - return 0; -} - -static unsigned int omap3evm_bklight_getlevel(struct lcd_panel *panel) -{ - return bklight_level; -} - -static unsigned int omap3evm_bklight_getmaxlevel(struct lcd_panel *panel) -{ - return 100; -} - struct lcd_panel omap3evm_panel = { .name = "omap3evm", .config = OMAP_LCDC_PANEL_TFT | OMAP_LCDC_INV_VSYNC | @@ -139,9 +117,6 @@ struct lcd_panel omap3evm_panel = { .enable = omap3evm_panel_enable, .disable = omap3evm_panel_disable, .get_caps = omap3evm_panel_get_caps, - .set_bklight_level = omap3evm_bklight_setlevel, - .get_bklight_level = omap3evm_bklight_getlevel, - .get_bklight_max = omap3evm_bklight_getmaxlevel, }; static int omap3evm_panel_probe(struct platform_device *pdev) -- 1.5.6 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
