+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
- * PCF50633 backlight device driver
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/platform_device.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 actual 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 != BACKLIGHT_POWER_ON)
- 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 const struct backlight_ops pcf50633_bl_ops = {
- .get_brightness = pcf50633_bl_get_brightness,
- .update_status = pcf50633_bl_update_status,
- .options = BL_CORE_SUSPENDRESUME,
-};
-
-static int pcf50633_bl_probe(struct platform_device *pdev)
-{
- struct pcf50633_bl *pcf_bl;
- struct device *parent = pdev->dev.parent;
- struct pcf50633_platform_data *pcf50633_data = dev_get_platdata(parent);
- struct pcf50633_bl_platform_data *pdata = pcf50633_data->backlight_data;
- struct backlight_properties bl_props;
-
- pcf_bl = devm_kzalloc(&pdev->dev, sizeof(*pcf_bl), GFP_KERNEL);
- if (!pcf_bl)
- return -ENOMEM;
-
- memset(&bl_props, 0, sizeof(bl_props));
- bl_props.type = BACKLIGHT_RAW;
- bl_props.max_brightness = 0x3f;
- bl_props.power = BACKLIGHT_POWER_ON;
-
- if (pdata) {
- bl_props.brightness = pdata->default_brightness;
- pcf_bl->brightness_limit = pdata->default_brightness_limit;
- } else {
- bl_props.brightness = 0x3f;
- pcf_bl->brightness_limit = 0x3f;
- }
-
- pcf_bl->pcf = dev_to_pcf50633(pdev->dev.parent);
-
- pcf_bl->bl = devm_backlight_device_register(&pdev->dev, pdev->name,
- &pdev->dev, pcf_bl,
- &pcf50633_bl_ops, &bl_props);
-
- if (IS_ERR(pcf_bl->bl))
- return PTR_ERR(pcf_bl->bl);
-
- platform_set_drvdata(pdev, pcf_bl);
-
- pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDDIM, pdata->ramp_time);
-
- /*
- * Should be different from bl_props.brightness, so we do not exit
- * 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;
-}
-
-static struct platform_driver pcf50633_bl_driver = {
- .probe = pcf50633_bl_probe,
- .driver = {
- .name = "pcf50633-backlight",
- },
-};
-
-module_platform_driver(pcf50633_bl_driver);
-
-MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-MODULE_DESCRIPTION("PCF50633 backlight driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:pcf50633-backlight");
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
- * PCF50633 backlight device driver
- */
-
-#ifndef __LINUX_MFD_PCF50633_BACKLIGHT
-#define __LINUX_MFD_PCF50633_BACKLIGHT
-
-/*
-* @default_brightness: Backlight brightness is initialized to this value
-*
-* Brightness to be used after the driver has been probed.
-* Valid range 0-63.
-*
-* @default_brightness_limit: The actual brightness is limited by this value
-*
-* Brightness limit to be used after the driver has been probed. This is useful
-* when it is not known how much power is available for the backlight during
-* probe.
-* Valid range 0-63. Can be changed later with pcf50633_bl_set_brightness_limit.
-*
-* @ramp_time: Display ramp time when changing brightness
-*
-* When changing the backlights brightness the change is not instant, instead
-* it fades smooth from one state to another. This value specifies how long
-* the fade should take. The lower the value the higher the fade time.
-* Valid range 0-255
-*/
-struct pcf50633_bl_platform_data {
- unsigned int default_brightness;
- unsigned int default_brightness_limit;
- uint8_t ramp_time;
-};
-
-
-struct pcf50633;
-
-int pcf50633_bl_set_brightness_limit(struct pcf50633 *pcf, unsigned int limit);
-
-#endif
-
projects / thirdparty / linux.git / commitdiff
