1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
20 	struct backlight_device *bl;  member
34  * @limit: The brightness limit. Valid values are 0-63
38 	struct pcf50633_bl *pcf_bl = platform_get_drvdata(pcf->bl_pdev);  in pcf50633_bl_set_brightness_limit()
41 		return -ENODEV;  in pcf50633_bl_set_brightness_limit()
43 	pcf_bl->brightness_limit = limit & 0x3f;  in pcf50633_bl_set_brightness_limit()
44 	backlight_update_status(pcf_bl->bl);  in pcf50633_bl_set_brightness_limit()
49 static int pcf50633_bl_update_status(struct backlight_device *bl)  in pcf50633_bl_update_status()  argument
51 	struct pcf50633_bl *pcf_bl = bl_get_data(bl);  in pcf50633_bl_update_status()
55 	if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK) ||  in pcf50633_bl_update_status()
56 		bl->props.power != FB_BLANK_UNBLANK)  in pcf50633_bl_update_status()
58 	else if (bl->props.brightness < pcf_bl->brightness_limit)  in pcf50633_bl_update_status()
59 		new_brightness = bl->props.brightness;  in pcf50633_bl_update_status()
61 		new_brightness = pcf_bl->brightness_limit;  in pcf50633_bl_update_status()
64 	if (pcf_bl->brightness == new_brightness)  in pcf50633_bl_update_status()
68 		pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDOUT,  in pcf50633_bl_update_status()
70 		if (!pcf_bl->brightness)  in pcf50633_bl_update_status()
71 			pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDENA, 1);  in pcf50633_bl_update_status()
73 		pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDENA, 0);  in pcf50633_bl_update_status()
76 	pcf_bl->brightness = new_brightness;  in pcf50633_bl_update_status()
81 static int pcf50633_bl_get_brightness(struct backlight_device *bl)  in pcf50633_bl_get_brightness()  argument
83 	struct pcf50633_bl *pcf_bl = bl_get_data(bl);  in pcf50633_bl_get_brightness()
85 	return pcf_bl->brightness;  in pcf50633_bl_get_brightness()
97 	struct device *parent = pdev->dev.parent;  in pcf50633_bl_probe()
99 	struct pcf50633_bl_platform_data *pdata = pcf50633_data->backlight_data;  in pcf50633_bl_probe()
102 	pcf_bl = devm_kzalloc(&pdev->dev, sizeof(*pcf_bl), GFP_KERNEL);  in pcf50633_bl_probe()
104 		return -ENOMEM;  in pcf50633_bl_probe()
112 		bl_props.brightness = pdata->default_brightness;  in pcf50633_bl_probe()
113 		pcf_bl->brightness_limit = pdata->default_brightness_limit;  in pcf50633_bl_probe()
116 		pcf_bl->brightness_limit = 0x3f;  in pcf50633_bl_probe()
119 	pcf_bl->pcf = dev_to_pcf50633(pdev->dev.parent);  in pcf50633_bl_probe()
121 	pcf_bl->bl = devm_backlight_device_register(&pdev->dev, pdev->name,  in pcf50633_bl_probe()
122 						&pdev->dev, pcf_bl,  in pcf50633_bl_probe()
125 	if (IS_ERR(pcf_bl->bl))  in pcf50633_bl_probe()
126 		return PTR_ERR(pcf_bl->bl);  in pcf50633_bl_probe()
130 	pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDDIM, pdata->ramp_time);  in pcf50633_bl_probe()
136 	pcf_bl->brightness = pcf_bl->bl->props.brightness + 1;  in pcf50633_bl_probe()
138 	backlight_update_status(pcf_bl->bl);  in pcf50633_bl_probe()
146 		.name = "pcf50633-backlight",
152 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
155 MODULE_ALIAS("platform:pcf50633-backlight");