From 33584e9f85c02e61afe0bfb6cb89269cc859e4f8 Mon Sep 17 00:00:00 2001 From: Eric Miao Date: Thu, 14 Aug 2008 17:09:59 +0800 Subject: [PATCH] backlight: add DA9030/DA9034 WLED-based backlight support Signed-off-by: Mike Rapoport Signed-off-by: Eric Miao --- drivers/video/backlight/Kconfig | 7 ++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/da903x.c | 202 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 210 insertions(+), 0 deletions(-) create mode 100644 drivers/video/backlight/da903x.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 452b770..f50a03e 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -156,6 +156,13 @@ config BACKLIGHT_PWM If you have a LCD backlight adjustable by PWM, say Y to enable this driver. +config BACKLIGHT_DA903X + tristate "Backlight Driver for DA9030/DA9034 using WLED" + depends on BACKLIGHT_CLASS_DEVICE && PMIC_DA903X + help + If you have a LCD backlight connected to the WLED output of DA9030 + or DA9034 WLED output, say Y here to enable this driver. + config BACKLIGHT_MBP_NVIDIA tristate "MacBook Pro Nvidia Backlight Driver" depends on BACKLIGHT_CLASS_DEVICE && X86 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index b405aac..a6ce5d3 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -15,5 +15,6 @@ obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o +obj-$(CONFIG_BACKLIGHT_DA903X) += da903x.o obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o diff --git a/drivers/video/backlight/da903x.c b/drivers/video/backlight/da903x.c new file mode 100644 index 0000000..d900c64 --- /dev/null +++ b/drivers/video/backlight/da903x.c @@ -0,0 +1,202 @@ +/* + * Backlight driver for Dialog Semiconductor DA9030/DA9034 + * + * Copyright (C) 2008 Compulab, Ltd. + * Mike Rapoport + * + * Copyright (C) 2006-2008 Marvell International Ltd. + * Eric Miao + * + * 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. + */ + +#include +#include +#include +#include +#include +#include + +#define DA9030_WLED_CONTROL 0x25 +#define DA9030_WLED_CP_EN (1 << 6) +#define DA9030_WLED_TRIM(x) ((x) & 0x7) + +#define DA9034_WLED_CONTROL1 0x3C +#define DA9034_WLED_CONTROL2 0x3D + +#define DA9034_WLED_BOOST_EN (1 << 5) + +#define DA9030_MAX_BRIGHTNESS 8 +#define DA9034_MAX_BRIGHTNESS 0x7f + +struct da903x_backlight_data { + struct device *da903x_dev; + int id; + int current_brightness; +}; + +static int da903x_backlight_set(struct backlight_device *bl, int brightness) +{ + struct da903x_backlight_data *data = bl_get_data(bl); + struct device *dev = data->da903x_dev; + uint8_t val; + int ret = 0; + + switch (data->id) { + case DA9034_ID_WLED: + ret = da903x_update(dev, DA9034_WLED_CONTROL1, + brightness, 0x7f); + if (ret) + return ret; + + if (data->current_brightness && brightness == 0) + ret = da903x_clr_bit(dev, + DA9034_WLED_CONTROL2, + DA9034_WLED_BOOST_EN); + + if (data->current_brightness == 0 && brightness) + ret = da903x_set_bit(dev, + DA9034_WLED_CONTROL2, + DA9034_WLED_BOOST_EN); + break; + case DA9030_ID_WLED: + val = DA9030_WLED_TRIM(brightness - 1); + val |= brightness ? DA9030_WLED_CP_EN : 0; + ret = da903x_write(dev, DA9030_WLED_CONTROL, val); + break; + } + + if (ret) + return ret; + + data->current_brightness = brightness; + return 0; +} + +static int da903x_backlight_update_status(struct backlight_device *bl) +{ + int brightness = bl->props.brightness; + + if (bl->props.power != FB_BLANK_UNBLANK) + brightness = 0; + + if (bl->props.fb_blank != FB_BLANK_UNBLANK) + brightness = 0; + + return da903x_backlight_set(bl, brightness); +} + +static int da903x_backlight_get_brightness(struct backlight_device *bl) +{ + struct da903x_backlight_data *data = bl_get_data(bl); + return data->current_brightness; +} + +static struct backlight_ops da903x_backlight_ops = { + .update_status = da903x_backlight_update_status, + .get_brightness = da903x_backlight_get_brightness, +}; + +static int da903x_backlight_probe(struct platform_device *pdev) +{ + struct da903x_backlight_data *data; + struct backlight_device *bl; + int id, max_brightness; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (data == NULL) + return -ENOMEM; + + id = pdev->id; + + switch (id) { + case DA9030_ID_WLED: + max_brightness = DA9030_MAX_BRIGHTNESS; + break; + case DA9034_ID_WLED: + max_brightness = DA9034_MAX_BRIGHTNESS; + break; + default: + dev_err(&pdev->dev, "invalid backlight device ID(%d)\n", id); + return -EINVAL; + } + + data->da903x_dev = pdev->dev.parent; + data->id = id; + data->current_brightness = 0; + + bl = backlight_device_register(pdev->name, &pdev->dev, + data, &da903x_backlight_ops); + if (IS_ERR(bl)) { + dev_err(&pdev->dev, "failed to register backlight\n"); + return PTR_ERR(bl); + } + + bl->props.max_brightness = max_brightness; + bl->props.brightness = max_brightness; + + platform_set_drvdata(pdev, bl); + backlight_update_status(bl); + return 0; +} + +static int da903x_backlight_remove(struct platform_device *pdev) +{ + struct backlight_device *bl = platform_get_drvdata(pdev); + struct da903x_backlight_data *data = bl_get_data(bl); + + backlight_device_unregister(bl); + kfree(data); + return 0; +} + +#ifdef CONFIG_PM +static int da903x_backlight_suspend(struct platform_device *pdev, + pm_message_t state) +{ + struct backlight_device *bl = platform_get_drvdata(pdev); + return da903x_backlight_set(bl, 0); +} + +static int da903x_backlight_resume(struct platform_device *pdev) +{ + struct backlight_device *bl = platform_get_drvdata(pdev); + + backlight_update_status(bl); + return 0; +} +#else +#define da903x_backlight_suspend NULL +#define da903x_backlight_resume NULL +#endif + +static struct platform_driver da903x_backlight_driver = { + .driver = { + .name = "da903x-backlight", + .owner = THIS_MODULE, + }, + .probe = da903x_backlight_probe, + .remove = da903x_backlight_remove, + .suspend = da903x_backlight_suspend, + .resume = da903x_backlight_resume, +}; + +static int __init da903x_backlight_init(void) +{ + return platform_driver_register(&da903x_backlight_driver); +} +module_init(da903x_backlight_init); + +static void __exit da903x_backlight_exit(void) +{ + platform_driver_unregister(&da903x_backlight_driver); +} +module_exit(da903x_backlight_exit); + +MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034"); +MODULE_AUTHOR("Eric Miao " + "Mike Rapoport "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da903x-backlight"); -- 1.5.4.3