1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  Copyright (C) 2009-2010, Lars-Peter Clausen <[email protected]>
19 	struct backlight_device *bl;  member
33  * @limit: The brightness limit. Valid values are 0-63
37 	struct pcf50633_bl *pcf_bl = platform_get_drvdata(pcf->bl_pdev);  in pcf50633_bl_set_brightness_limit()
40 		return -ENODEV;  in pcf50633_bl_set_brightness_limit()
42 	pcf_bl->brightness_limit = limit & 0x3f;  in pcf50633_bl_set_brightness_limit()
43 	backlight_update_status(pcf_bl->bl);  in pcf50633_bl_set_brightness_limit()
48 static int pcf50633_bl_update_status(struct backlight_device *bl)  in pcf50633_bl_update_status()  argument
50 	struct pcf50633_bl *pcf_bl = bl_get_data(bl);  in pcf50633_bl_update_status()
54 	if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK) ||  in pcf50633_bl_update_status()
55 		bl->props.power != BACKLIGHT_POWER_ON)  in pcf50633_bl_update_status()
57 	else if (bl->props.brightness < pcf_bl->brightness_limit)  in pcf50633_bl_update_status()
58 		new_brightness = bl->props.brightness;  in pcf50633_bl_update_status()
60 		new_brightness = pcf_bl->brightness_limit;  in pcf50633_bl_update_status()
63 	if (pcf_bl->brightness == new_brightness)  in pcf50633_bl_update_status()
67 		pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDOUT,  in pcf50633_bl_update_status()
69 		if (!pcf_bl->brightness)  in pcf50633_bl_update_status()
70 			pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDENA, 1);  in pcf50633_bl_update_status()
72 		pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDENA, 0);  in pcf50633_bl_update_status()
75 	pcf_bl->brightness = new_brightness;  in pcf50633_bl_update_status()
80 static int pcf50633_bl_get_brightness(struct backlight_device *bl)  in pcf50633_bl_get_brightness()  argument
82 	struct pcf50633_bl *pcf_bl = bl_get_data(bl);  in pcf50633_bl_get_brightness()
84 	return pcf_bl->brightness;  in pcf50633_bl_get_brightness()
96 	struct device *parent = pdev->dev.parent;  in pcf50633_bl_probe()
98 	struct pcf50633_bl_platform_data *pdata = pcf50633_data->backlight_data;  in pcf50633_bl_probe()
101 	pcf_bl = devm_kzalloc(&pdev->dev, sizeof(*pcf_bl), GFP_KERNEL);  in pcf50633_bl_probe()
103 		return -ENOMEM;  in pcf50633_bl_probe()
111 		bl_props.brightness = pdata->default_brightness;  in pcf50633_bl_probe()
112 		pcf_bl->brightness_limit = pdata->default_brightness_limit;  in pcf50633_bl_probe()
115 		pcf_bl->brightness_limit = 0x3f;  in pcf50633_bl_probe()
118 	pcf_bl->pcf = dev_to_pcf50633(pdev->dev.parent);  in pcf50633_bl_probe()
120 	pcf_bl->bl = devm_backlight_device_register(&pdev->dev, pdev->name,  in pcf50633_bl_probe()
121 						&pdev->dev, pcf_bl,  in pcf50633_bl_probe()
124 	if (IS_ERR(pcf_bl->bl))  in pcf50633_bl_probe()
125 		return PTR_ERR(pcf_bl->bl);  in pcf50633_bl_probe()
129 	pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDDIM, pdata->ramp_time);  in pcf50633_bl_probe()
135 	pcf_bl->brightness = pcf_bl->bl->props.brightness + 1;  in pcf50633_bl_probe()
137 	backlight_update_status(pcf_bl->bl);  in pcf50633_bl_probe()
145 		.name = "pcf50633-backlight",
151 MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>");
154 MODULE_ALIAS("platform:pcf50633-backlight");