diff options
author | Lars-Peter Clausen <lars@metafoo.de> | 2009-11-02 19:54:35 +0100 |
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committer | Lars-Peter Clausen <lars@metafoo.de> | 2009-12-06 09:09:31 +0100 |
commit | 91e891a0feb54bada927e9556cfa2dc7ced21489 (patch) | |
tree | af4f5b652d2e9956f036ee62f1162fbc192d151c /drivers/video/backlight | |
parent | 227f3b939803d6ddb15643542c2290a44af94ece (diff) |
backlight/mfd: Add pcf50633 backlight driver
This patch adds a backlight driver controling the pcf50633 led converter.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Diffstat (limited to 'drivers/video/backlight')
-rw-r--r-- | drivers/video/backlight/Kconfig | 6 | ||||
-rw-r--r-- | drivers/video/backlight/Makefile | 1 | ||||
-rw-r--r-- | drivers/video/backlight/pcf50633-backlight.c | 185 |
3 files changed, 192 insertions, 0 deletions
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 09bfa9662e4..55eeb7fc94f 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -262,3 +262,9 @@ config BACKLIGHT_ADP5520 To compile this driver as a module, choose M here: the module will be called adp5520_bl. +config BACKLIGHT_PCF50633 + tristate "Backlight driver for NXP PCF50633 MFD" + depends on BACKLIGHT_CLASS_DEVICE && MFD_PCF50633 + help + If you have a backlight driven by a NXP PCF50633 MFD, say Y here to + enable its driver. diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 9a405548874..8d17f13ab8d 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -28,4 +28,5 @@ obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o obj-$(CONFIG_BACKLIGHT_ADX) += adx_bl.o obj-$(CONFIG_BACKLIGHT_ADP5520) += adp5520_bl.o +obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o diff --git a/drivers/video/backlight/pcf50633-backlight.c b/drivers/video/backlight/pcf50633-backlight.c new file mode 100644 index 00000000000..10b9c31bc43 --- /dev/null +++ b/drivers/video/backlight/pcf50633-backlight.c @@ -0,0 +1,185 @@ +/* + * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de> + * PCF50633 backlight device driver + * + * This program 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/fb.h> +#include <linux/backlight.h> +#include <linux/mfd/pcf50633/core.h> +#include <linux/mfd/pcf50633/backlight.h> + +struct pcf50633_bl { + struct pcf50633 *pcf; + struct backlight_device *bl; + + unsigned int brightness; + unsigned int brightness_limit; +}; + +/* + * pcf50633_bl_set_brightness_limit + * + * Update the brightness limit for the pc50633 backlight. The actuall brightness + * will not go above the limit. This is useful to limit power drain for example + * on low battery. + * + * @dev: Pointer to a pcf50633 device + * @limit: The brightness limit. Valid values are 0-63 + */ +int pcf50633_bl_set_brightness_limit(struct pcf50633 *pcf, unsigned int limit) +{ + struct pcf50633_bl *pcf_bl = platform_get_drvdata(pcf->bl_pdev); + + if (!pcf_bl) + return -ENODEV; + + pcf_bl->brightness_limit = limit & 0x3f; + backlight_update_status(pcf_bl->bl); + + return 0; +} + +static int pcf50633_bl_update_status(struct backlight_device *bl) +{ + struct pcf50633_bl *pcf_bl = bl_get_data(bl); + unsigned int new_brightness; + + + if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK) || + bl->props.power != FB_BLANK_UNBLANK) + new_brightness = 0; + else if (bl->props.brightness < pcf_bl->brightness_limit) + new_brightness = bl->props.brightness; + else + new_brightness = pcf_bl->brightness_limit; + + + if (pcf_bl->brightness == new_brightness) + return 0; + + if (new_brightness) { + pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDOUT, + new_brightness); + if (!pcf_bl->brightness) + pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDENA, 1); + } else { + pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDENA, 0); + } + + pcf_bl->brightness = new_brightness; + + return 0; +} + +static int pcf50633_bl_get_brightness(struct backlight_device *bl) +{ + struct pcf50633_bl *pcf_bl = bl_get_data(bl); + return pcf_bl->brightness; +} + +static struct backlight_ops pcf50633_bl_ops = { + .get_brightness = pcf50633_bl_get_brightness, + .update_status = pcf50633_bl_update_status, + .options = BL_CORE_SUSPENDRESUME, +}; + +static int __devinit pcf50633_bl_probe(struct platform_device *pdev) +{ + int ret; + struct pcf50633_bl *pcf_bl; + struct pcf50633_platform_data *pcf50633_data = pdev->dev.parent->platform_data; + struct pcf50633_bl_platform_data *pdata = pcf50633_data->backlight_data; + + pcf_bl = kzalloc(sizeof(*pcf_bl), GFP_KERNEL); + if (!pcf_bl) + return -ENOMEM; + + pcf_bl->pcf = dev_to_pcf50633(pdev->dev.parent); + + pcf_bl->bl = backlight_device_register(pdev->name, &pdev->dev, pcf_bl, + &pcf50633_bl_ops); + + if (IS_ERR(pcf_bl->bl)) { + ret = PTR_ERR(pcf_bl->bl); + goto err_free; + } + + platform_set_drvdata(pdev, pcf_bl); + + pcf_bl->bl->props.max_brightness = 0x3f; + pcf_bl->bl->props.power = FB_BLANK_UNBLANK; + + if (pdata) { + pcf_bl->bl->props.brightness = pdata->default_brightness; + pcf_bl->brightness_limit = pdata->default_brightness_limit; + } else { + pcf_bl->bl->props.brightness = 0x3f; + pcf_bl->brightness_limit = 0x3f; + } + + pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDDIM, pdata->ramp_time); + + /* Should be different from props.brightness, so we don't + * update_status early the first time it's called */ + pcf_bl->brightness = pcf_bl->bl->props.brightness + 1; + + backlight_update_status(pcf_bl->bl); + + return 0; + +err_free: + kfree(pcf_bl); + + return ret; +} + +static int __devexit pcf50633_bl_remove(struct platform_device *pdev) +{ + struct pcf50633_bl *pcf_bl = platform_get_drvdata(pdev); + + backlight_device_unregister(pcf_bl->bl); + + platform_set_drvdata(pdev, NULL); + + kfree(pcf_bl); + + return 0; +} + +static struct platform_driver pcf50633_bl_driver = { + .probe = pcf50633_bl_probe, + .remove = __devexit_p(pcf50633_bl_remove), + .driver = { + .name = "pcf50633-backlight", + }, +}; + +static int __init pcf50633_bl_init(void) +{ + return platform_driver_register(&pcf50633_bl_driver); +} +module_init(pcf50633_bl_init); + +static void __exit pcf50633_bl_exit(void) +{ + platform_driver_unregister(&pcf50633_bl_driver); +} +module_exit(pcf50633_bl_exit); + +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); +MODULE_DESCRIPTION("PCF50633 backlight driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:pcf50633-backlight"); |