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Mike Rapoportrpurdie
Mike Rapoport
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backlight: da903x: Add backlight driver for DA9030/DA9034
Signed-off-by: Mike Rapoport <[email protected]> Signed-off-by: Eric Miao <[email protected]> Signed-off-by: Richard Purdie <[email protected]>
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‎drivers/video/backlight/Kconfig

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@@ -180,6 +180,13 @@ config BACKLIGHT_PWM
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If you have a LCD backlight adjustable by PWM, say Y to enable
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this driver.
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config BACKLIGHT_DA903X
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tristate "Backlight Driver for DA9030/DA9034 using WLED"
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depends on BACKLIGHT_CLASS_DEVICE && PMIC_DA903X
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help
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If you have a LCD backlight connected to the WLED output of DA9030
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or DA9034 WLED output, say Y here to enable this driver.
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config BACKLIGHT_MBP_NVIDIA
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tristate "MacBook Pro Nvidia Backlight Driver"
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depends on BACKLIGHT_CLASS_DEVICE && X86

‎drivers/video/backlight/Makefile

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@@ -18,6 +18,7 @@ obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
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obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
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obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
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obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o
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obj-$(CONFIG_BACKLIGHT_DA903X) += da903x.o
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obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
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obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o
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‎drivers/video/backlight/da903x.c

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/*
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* Backlight driver for Dialog Semiconductor DA9030/DA9034
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*
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* Copyright (C) 2008 Compulab, Ltd.
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* Mike Rapoport <[email protected]>
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*
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* Copyright (C) 2006-2008 Marvell International Ltd.
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* Eric Miao <[email protected]>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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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 <linux/mfd/da903x.h>
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#define DA9030_WLED_CONTROL 0x25
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#define DA9030_WLED_CP_EN (1 << 6)
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#define DA9030_WLED_TRIM(x) ((x) & 0x7)
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#define DA9034_WLED_CONTROL1 0x3C
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#define DA9034_WLED_CONTROL2 0x3D
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#define DA9034_WLED_BOOST_EN (1 << 5)
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#define DA9030_MAX_BRIGHTNESS 7
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#define DA9034_MAX_BRIGHTNESS 0x7f
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struct da903x_backlight_data {
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struct device *da903x_dev;
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int id;
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int current_brightness;
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};
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static int da903x_backlight_set(struct backlight_device *bl, int brightness)
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{
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struct da903x_backlight_data *data = bl_get_data(bl);
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struct device *dev = data->da903x_dev;
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uint8_t val;
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int ret = 0;
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switch (data->id) {
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case DA9034_ID_WLED:
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ret = da903x_update(dev, DA9034_WLED_CONTROL1,
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brightness, 0x7f);
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if (ret)
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return ret;
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if (data->current_brightness && brightness == 0)
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ret = da903x_clr_bits(dev,
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DA9034_WLED_CONTROL2,
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DA9034_WLED_BOOST_EN);
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if (data->current_brightness == 0 && brightness)
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ret = da903x_set_bits(dev,
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DA9034_WLED_CONTROL2,
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DA9034_WLED_BOOST_EN);
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break;
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case DA9030_ID_WLED:
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val = DA9030_WLED_TRIM(brightness);
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val |= brightness ? DA9030_WLED_CP_EN : 0;
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ret = da903x_write(dev, DA9030_WLED_CONTROL, val);
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break;
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}
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if (ret)
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return ret;
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data->current_brightness = brightness;
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return 0;
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}
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static int da903x_backlight_update_status(struct backlight_device *bl)
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{
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int brightness = bl->props.brightness;
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if (bl->props.power != FB_BLANK_UNBLANK)
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brightness = 0;
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if (bl->props.fb_blank != FB_BLANK_UNBLANK)
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brightness = 0;
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return da903x_backlight_set(bl, brightness);
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}
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static int da903x_backlight_get_brightness(struct backlight_device *bl)
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{
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struct da903x_backlight_data *data = bl_get_data(bl);
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return data->current_brightness;
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}
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static struct backlight_ops da903x_backlight_ops = {
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.update_status = da903x_backlight_update_status,
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.get_brightness = da903x_backlight_get_brightness,
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};
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static int da903x_backlight_probe(struct platform_device *pdev)
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{
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struct da903x_backlight_data *data;
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struct backlight_device *bl;
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int max_brightness;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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switch (pdev->id) {
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case DA9030_ID_WLED:
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max_brightness = DA9030_MAX_BRIGHTNESS;
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break;
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case DA9034_ID_WLED:
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max_brightness = DA9034_MAX_BRIGHTNESS;
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break;
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default:
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dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
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pdev->id);
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return -EINVAL;
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}
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data->id = pdev->id;
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data->da903x_dev = pdev->dev.parent;
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data->current_brightness = 0;
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bl = backlight_device_register(pdev->name, data->da903x_dev,
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data, &da903x_backlight_ops);
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if (IS_ERR(bl)) {
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dev_err(&pdev->dev, "failed to register backlight\n");
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return PTR_ERR(bl);
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}
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bl->props.max_brightness = max_brightness;
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bl->props.brightness = max_brightness;
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platform_set_drvdata(pdev, bl);
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backlight_update_status(bl);
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return 0;
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}
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static int da903x_backlight_remove(struct platform_device *pdev)
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{
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struct backlight_device *bl = platform_get_drvdata(pdev);
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struct da903x_backlight_data *data = bl_get_data(bl);
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backlight_device_unregister(bl);
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kfree(data);
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return 0;
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}
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#ifdef CONFIG_PM
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static int da903x_backlight_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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struct backlight_device *bl = platform_get_drvdata(pdev);
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return da903x_backlight_set(bl, 0);
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}
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static int da903x_backlight_resume(struct platform_device *pdev)
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{
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struct backlight_device *bl = platform_get_drvdata(pdev);
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backlight_update_status(bl);
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return 0;
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}
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#else
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#define da903x_backlight_suspend NULL
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#define da903x_backlight_resume NULL
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#endif
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static struct platform_driver da903x_backlight_driver = {
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.driver = {
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.name = "da903x-backlight",
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.owner = THIS_MODULE,
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},
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.probe = da903x_backlight_probe,
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.remove = da903x_backlight_remove,
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.suspend = da903x_backlight_suspend,
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.resume = da903x_backlight_resume,
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};
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static int __init da903x_backlight_init(void)
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{
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return platform_driver_register(&da903x_backlight_driver);
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}
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module_init(da903x_backlight_init);
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static void __exit da903x_backlight_exit(void)
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{
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platform_driver_unregister(&da903x_backlight_driver);
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}
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module_exit(da903x_backlight_exit);
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MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034");
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MODULE_AUTHOR("Eric Miao <[email protected]>"
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"Mike Rapoport <[email protected]>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da903x-backlight");

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