1 // SPDX-License-Identifier: GPL-2.0-only
3  * TI LP8788 MFD - backlight driver
31 #define DEFAULT_BL_NAME			"lcd-backlight"
38 static int lp8788_backlight_configure(struct lp8788_bl *bl)  in lp8788_backlight_configure()  argument
45 	ret = lp8788_write_byte(bl->lp, LP8788_BL_RAMP, val);  in lp8788_backlight_configure()
56 	return lp8788_write_byte(bl->lp, LP8788_BL_CONFIG, val);  in lp8788_backlight_configure()
61 	struct lp8788_bl *bl = bl_get_data(bl_dev);  in lp8788_bl_update_status()  local
63 	if (bl_dev->props.state & BL_CORE_SUSPENDED)  in lp8788_bl_update_status()
64 		bl_dev->props.brightness = 0;  in lp8788_bl_update_status()
66 	lp8788_write_byte(bl->lp, LP8788_BL_BRIGHTNESS, bl_dev->props.brightness);  in lp8788_bl_update_status()
76 static int lp8788_backlight_register(struct lp8788_bl *bl)  in lp8788_backlight_register()  argument
89 	bl_dev = backlight_device_register(DEFAULT_BL_NAME, bl->lp->dev, bl,  in lp8788_backlight_register()
94 	bl->bl_dev = bl_dev;  in lp8788_backlight_register()
99 static void lp8788_backlight_unregister(struct lp8788_bl *bl)  in lp8788_backlight_unregister()  argument
101 	struct backlight_device *bl_dev = bl->bl_dev;  in lp8788_backlight_unregister()
127 	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);  in lp8788_backlight_probe()
128 	struct lp8788_bl *bl;  in lp8788_backlight_probe()  local
131 	bl = devm_kzalloc(lp->dev, sizeof(struct lp8788_bl), GFP_KERNEL);  in lp8788_backlight_probe()
132 	if (!bl)  in lp8788_backlight_probe()
133 		return -ENOMEM;  in lp8788_backlight_probe()
135 	bl->lp = lp;  in lp8788_backlight_probe()
137 	platform_set_drvdata(pdev, bl);  in lp8788_backlight_probe()
139 	ret = lp8788_backlight_configure(bl);  in lp8788_backlight_probe()
141 		dev_err(lp->dev, "backlight config err: %d\n", ret);  in lp8788_backlight_probe()
145 	ret = lp8788_backlight_register(bl);  in lp8788_backlight_probe()
147 		dev_err(lp->dev, "register backlight err: %d\n", ret);  in lp8788_backlight_probe()
151 	ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);  in lp8788_backlight_probe()
153 		dev_err(lp->dev, "register sysfs err: %d\n", ret);  in lp8788_backlight_probe()
157 	backlight_update_status(bl->bl_dev);  in lp8788_backlight_probe()
162 	lp8788_backlight_unregister(bl);  in lp8788_backlight_probe()
169 	struct lp8788_bl *bl = platform_get_drvdata(pdev);  in lp8788_backlight_remove()  local
170 	struct backlight_device *bl_dev = bl->bl_dev;  in lp8788_backlight_remove()
172 	bl_dev->props.brightness = 0;  in lp8788_backlight_remove()
174 	sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);  in lp8788_backlight_remove()
175 	lp8788_backlight_unregister(bl);  in lp8788_backlight_remove()
190 MODULE_ALIAS("platform:lp8788-backlight");